Execution Copy SUBORDINATED NOTE PURCHASE AGREEMENT This SUBORDINATED NOTE PURCHASE AGREEMENT (this “Agreement”) is dated as of September 18, 2020, and is made by and among Sound Financial Bancorp, Inc., a Maryland corporation (the “Company”), and the...

Execution Copy SUBORDINATED NOTE PURCHASE AGREEMENT This SUBORDINATED NOTE PURCHASE AGREEMENT (this “Agreement”) is dated as of September 18, 2020, and is made by and among Sound Financial Bancorp, Inc., a Maryland corporation (the “Company”), and the purchasers of the Subordinated Notes (as defined herein) identified on the signature pages hereto (each a “Purchaser” and collectively, the “Purchasers”). RECITALS WHEREAS, the Company has requested that the Purchasers purchase from the Company up to $12.0 million in aggregate principal amount of Subordinated Notes, which aggregate amount is intended to be eligible to qualify as Tier 2 Capital (as defined herein). WHEREAS, the Company has engaged Xxxxx, Xxxxxxxx & Xxxxx, Inc., as its exclusive placement agent (“Placement Agent”) for the offering of the Subordinated Notes. WHEREAS, each of the Purchasers is an institutional “accredited investor” as such term is defined in Rule 501 of Regulation D (“Regulation D”) promulgated under the Securities Act of 1933, as amended (the “Securities Act”) or a QIB (as defined below). WHEREAS, the offer and sale of the Subordinated Notes by the Company is being made in reliance upon the exemptions from registration available under Section 4(a)(2) of the Securities Act and Rule 506(b) of Regulation D. WHEREAS, each Purchaser is willing to purchase from the Company a Subordinated Note in the principal amount set forth on such Purchaser’s respective signature page hereto (the “Subordinated Note Amount”) in accordance with the terms, subject to the conditions and in reliance on, the recitals, representations, warranties, covenants and agreements set forth herein and in the Subordinated Notes. NOW, THEREFORE, in consideration of the mutual covenants, conditions and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows: AGREEMENT 1. DEFINITIONS. 1.1 Defined Terms. The following capitalized terms used in this Agreement and in the Subordinated Notes have the meanings defined or referenced below. Certain other capitalized terms used only in specific sections of this Agreement may be defined in such sections. “Affiliate(s)” means, with respect to any Person, such Person’s immediate family members, partners, members or parent and subsidiary corporations, and any other Person directly or indirectly controlling, controlled by, or under common control with said Person and their respective Affiliates. “Agreement” has the meaning set forth in the preamble hereto.

“Applicable Procedures” means, with respect to any transfer or exchange of or for beneficial interests in any Subordinated Note represented by a global certificate, the rules and procedures of DTC that apply to such transfer or exchange. “Bank” means Sound Community Bank, a Washington state-chartered commercial bank and wholly owned subsidiary of the Company. “Business Day” means any day other than a Saturday, Sunday or any other day on which banking institutions in the State of Washington are permitted or required by any applicable law or executive order to close. “Bylaws” means the Bylaws of the Company, as in effect on the Closing Date. “Charter” means the Articles of Incorporation of the Company, as in effect on the Closing Date. “Closing” has the meaning set forth in Section 2.5. “Closing Date” means September 18, 2020. “Company” has the meaning set forth in the preamble hereto and shall include any successors to the Company. “Company Covered Person” has the meaning set forth in Section 4.2.4. “Company’s Reports” means (i) the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 as filed with the SEC on March 12, 2020; (ii) the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2020 as filed with the SEC on May 11, 2020; (iii) the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2020 as filed with the SEC on August 7, 2020; (iv) the Company’s Definitive Proxy Statement on Schedule 14A related to its 2020 Annual Meeting of Shareholders, filed with the SEC on April 16, 2020; and (v) the report on Form FR Y-9SP filed by the Company for the period ended June 30, 2019. “Disbursement” has the meaning set forth in Section 3.1. “Disqualification Event” has the meaning set forth in Section 4.2.4. “DTC” has the meaning set forth in Section 5.9. “Equity Interest” means any and all shares, interests, participations or other equivalents (however designated) of capital stock of a corporation, any and all equivalent ownership interests in a Person which is not a corporation, and any and all warrants, options or other rights to purchase any of the foregoing. “Event of Default” has the meaning set forth in the Subordinated Notes. 2

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of the SEC promulgated thereunder. “FDIC” means the Federal Deposit Insurance Corporation. “GAAP” means generally accepted accounting principles in effect from time to time in the United States of America. “Global Note” has the meaning set forth in Section 3.1. “Governmental Agency(ies)” means, individually or collectively, any arbitrator, court, federal, state, county or local governmental department, commission, board, regulatory authority or administrative agency (including, without limitation, each applicable Regulatory Agency) with jurisdiction over the Company or a Subsidiary or any of their respective properties, assets or operations. “Governmental Licenses” has the meaning set forth in Section 4.3. “Hazardous Materials” means flammable explosives, asbestos, urea formaldehyde insulation, polychlorinated biphenyls, radioactive materials, hazardous wastes, toxic or contaminated substances or similar materials, including, without limitation, any substances which are “hazardous substances,” “hazardous wastes,” “hazardous materials” or “toxic substances” under the Hazardous Materials Laws and/or other applicable environmental laws, ordinances or regulations. “Hazardous Materials Laws” mean any laws, regulations, permits, licenses or requirements pertaining to the protection, preservation, conservation or regulation of the environment which relates to real property, including: the Clean Air Act, as amended, 42 U.S.C. Section 7401 et seq.; the Federal Water Pollution Control Act, as amended, 33 U.S.C. Section 1251 et seq.; the Resource Conservation and Recovery Act of 1976, as amended, 42 U.S.C. Section 6901 et seq.; the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended (including the Superfund Amendments and Reauthorization Act of 1986), 42 U.S.C. Section 9601 et seq.; the Toxic Substances Control Act, as amended, 15 U.S.C. Section 2601 et seq.; the Occupational Safety and Health Act, as amended, 29 U.S.C. Section 651, the Emergency Planning and Community Right-to-Know Act of 1986, 42 U.S.C. Section 11001 et seq.; the Mine Safety and Health Act of 1977, as amended, 30 U.S.C. Section 801 et seq.; the Safe Drinking Water Act, 42 U.S.C. Section 300f et seq.; and all comparable state and local laws and regulations. “Indebtedness” means: (i) all items arising from the borrowing of money that, according to GAAP as in effect from time to time, would be included in determining total liabilities as shown on the consolidated balance sheet of the Company; and (ii) all obligations for indebtedness secured by any lien in property owned by the Company or any Subsidiary whether or not such obligations shall have been assumed; provided, however, Indebtedness shall not include deposits or other Indebtedness created, incurred or maintained in the ordinary course of the Company’s or the Bank’s business (including, without limitation, federal funds purchased, advances from any Federal Home Loan Bank, secured deposits of municipalities, letters of credit issued by the Company or the Bank or any other Subsidiary and repurchase arrangements) and consistent with customary banking practices and applicable laws and regulations. 3

“Leases” means all leases, licenses or other documents providing for the use or occupancy of any portion of any Property, including all amendments, extensions, renewals, supplements, modifications, sublets and assignments thereof and all separate letters or separate agreements relating thereto. “Material Adverse Effect” means any change or effect that (i) is or would be reasonably likely to be material and adverse to the financial condition, results of operations or business of the Company and its Subsidiaries, on a consolidated basis, or (ii) would materially impair the ability of the Company to perform its obligations under any of the Transaction Documents, or otherwise materially impede the consummation of the transactions contemplated hereby; provided, however, that “Material Adverse Effect” shall not be deemed to include the impact of (1) changes in banking and similar laws, rules or regulations of general applicability or interpretations thereof by Governmental Agencies, (2) changes in GAAP or regulatory accounting requirements applicable to financial institutions and their holding companies generally, (3) changes after the date of this Agreement in general economic or capital market conditions affecting financial institutions or their market prices generally and not specifically related to the Company, the Bank or the Purchasers, including changes in prevailing interest rates, credit availability and liquidity, currency exchange rates, and price levels or trading volumes in the United States or foreign securities markets, (4) direct effects of compliance with this Agreement on the operating performance of the Company, the Bank or the Purchasers, including expenses incurred by the Company, the Bank or the Purchasers in consummating the transactions contemplated by this Agreement, (5) the effects of any action or omission taken by the Company with the prior written consent of the Purchasers, and vice versa, or as otherwise contemplated by this Agreement and the Subordinated Notes and (6) the outbreak, continuation or escalation of war, hostilities or acts of terrorism (whether declared or undeclared), any national or international calamity, or any natural disaster. “Maturity Date” means October 1, 2030. “Person” means an individual, a corporation (whether or not for profit), a partnership, a limited liability company, a joint venture, an association, a trust, an unincorporated organization, a government or any department or agency thereof (including a Governmental Agency) or any other entity or organization. “Placement Agent” has the meaning set forth in the Recitals. “Property” means any real property owned or leased by the Company or any Affiliate or Subsidiary of the Company. “Purchaser” or “Purchasers” has the meaning set forth in the preamble hereto. “QIB” has the meaning set forth in Section 5.9. “Regulation D” has the meaning set forth in the Recitals. “Regulatory Agency” means any federal or state agency charged with the supervision or regulation of depository institutions or holding companies of depository institutions, or engaged in the insurance of depository institution deposits, or any court, administrative agency or 4

commission or other authority, body or agency having supervisory or regulatory authority with respect to the Company, the Bank or any of their Subsidiaries. “Risk Factors” has the meaning set forth in Section 4.7. “SEC” means the United States Securities and Exchange Commission. “Secondary Market Transaction” has the meaning set forth in Section 5.6. “Securities Act” has the meaning set forth in the Recitals. “Subordinated Note” means the Subordinated Note (or collectively, the “Subordinated Notes”) in the form attached as Exhibit A hereto, as amended, restated, supplemented or modified from time to time, and each Subordinated Note delivered in substitution or exchange for such Subordinated Note. “Subordinated Note Amount” has the meaning set forth in the Recitals. “Subsidiary” or “Subsidiaries” means with respect to any Person, any corporation or entity in which a majority of the outstanding Equity Interest is directly or indirectly owned by such Person. “Tier 2 Capital” has the meaning given to the term “Tier 2 capital” in 12 C.F.R. Parts 217 and 250, as amended, modified and supplemented and in effect from time to time or any replacement thereof. “Transaction Documents” has the meaning set forth in Section 3.2.1.1. “Trust Indenture Act” means the Trust Indenture Act of 1939, as amended, and the rules and regulations promulgated by the SEC thereunder. 1.2 Interpretations. The foregoing definitions are equally applicable to both the singular and plural forms of the terms defined. The words “hereof”, “herein” and “hereunder” and words of like import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The word “including” when used in this Agreement without the phrase “without limitation,” shall mean “including, without limitation.” All references to time of day herein are references to Eastern Time unless otherwise specifically provided. All references to this Agreement and Subordinated Notes shall be deemed to be to such documents as amended, modified or restated from time to time. With respect to any reference in this Agreement to any defined term, (i) if such defined term refers to a Person, then it shall also mean all heirs, legal representatives and permitted successors and assigns of such Person, and (ii) if such defined term refers to a document, instrument or agreement, then it shall also include any amendment, replacement, extension or other modification thereof. 1.3 Exhibits Incorporated. All Exhibits attached are hereby incorporated into this Agreement. 5

3. DISBURSEMENT. 3.1 Disbursement. On the Closing Date, assuming all of the terms and conditions set forth in Section 3.2 have been satisfied by the Company and the Company has executed and delivered to each of the Purchasers this Agreement and such Purchaser’s Subordinated Note and any other related documents required by Section 3.2 in form and substance reasonably satisfactory to the Purchasers, each Purchaser shall countersign and deliver this Agreement and disburse in immediately available funds the Subordinated Note Amount set forth on each Purchaser’s respective signature page hereto to the Company in exchange for an electronic securities entitlement to be credited to the Purchaser’s account (or the account of the Purchaser’s securities intermediary) through the facilities of DTC in accordance with the Applicable Procedures of DTC with a principal amount equal to such Subordinated Note Amount (the “Disbursement”). The Company will deliver to U.S. Bank National Association a global certificate representing the Subordinated Notes (“Global Note”) registered in name of Cede & Co., to DTC. 3.2 Conditions Precedent to Disbursement. 3.2.1 Conditions to the Purchasers’ Obligation. The obligation of each Purchaser to consummate the purchase of the Subordinated Notes to be purchased by them at Closing and to effect the Disbursement is subject to delivery by or at the direction of the Company to such Purchaser each of the following (or written waiver by such Purchaser prior to the Closing of such delivery): 3.2.1.1 Transaction Documents. This Agreement and the Subordinated Notes (collectively, the “Transaction Documents”), each duly authorized and executed by the Company. 3.2.1.2 Authority Documents. (a) A copy, certified by the Secretary or Assistant Secretary of the Company, of the Charter of the Company; (b) A certificate of good standing of the Company issued by the Secretary of State of the State of Maryland; (c) A copy, certified by the Secretary or Assistant Secretary, of the Bylaws of the Company; (d) A copy, certified by the Secretary or Assistant Secretary of the Company, of the resolutions of the board of directors of the Company, and any committee thereof, authorizing the issuance of the Subordinated Notes and the execution, delivery and performance of the Transaction Documents; (e) An incumbency certificate of the Secretary or Assistant Secretary of the Company certifying the names of the officer or officers of the Company authorized to sign the Transaction Documents and the other documents provided for in this Agreement; and 7

(f) The opinion of Silver, Xxxxxxxx, Taff & Xxxxxxx LLP, counsel to the Company, dated as of the Closing Date, substantially in the form set forth at Exhibit B attached hereto addressed to the Purchasers and Placement Agent. 3.2.1.3 Other Documents. Such other certificates, schedules, resolutions, notes and/or other documents which are provided for hereunder or as a Purchaser may reasonably request. 3.2.2 Conditions to the Company’s Obligation. 3.2.2.1 With respect to a given Purchaser, the obligation of the Company to consummate the sale of the Subordinated Notes and to effect the Closing is subject to delivery by or at the direction of such Purchaser to the Company of this Agreement, duly authorized and executed by such Purchaser. 4. REPRESENTATIONS AND WARRANTIES OF COMPANY. The Company hereby represents and warrants to each Purchaser as follows: 4.1 Organization and Authority. 4.1.1 Organization Matters of the Company and Its Subsidiaries. 4.1.1.1 The Company is a duly organized corporation, is validly existing and in good standing under the laws of the State of Maryland and has all requisite corporate power and authority to conduct its business and activities as presently conducted, to own its properties, and to perform its obligations under the Transaction Documents. The Company is duly qualified as a foreign corporation to transact business and is in good standing in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not reasonably be expected to result in a Material Adverse Effect. The Company is duly registered as a bank holding company under the Bank Holding Company Act of 1956, as amended. 4.1.1.2 The entities set forth on Schedule A attached hereto are the only direct or indirect Subsidiaries of the Company. Each Subsidiary of the Company (other than the Bank) has been duly organized and is validly existing either as a corporation, or, in the case of the Bank, has been duly chartered and is validly existing as a Washington state-chartered commercial bank in good standing under the laws of the jurisdiction of its incorporation, has corporate power and authority to own, lease and operate its properties and to conduct its business and is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not reasonably be expected to result in a Material Adverse Effect. All of the issued and outstanding shares of capital stock or other Equity Interests in each Subsidiary of the Company have been duly authorized and validly issued, are fully paid and non-assessable and are owned by the Company directly or through Subsidiaries of the Company, free and clear of any security interest, mortgage, pledge, lien, encumbrance or claim; none of the outstanding shares of capital stock of, or other 8

Equity Interests in, any Subsidiary of the Company were issued in violation of the preemptive or similar rights of any security holder of such Subsidiary of the Company or any other entity. 4.1.1.3 The deposit accounts of the Bank are insured by the FDIC up to applicable limits. The Bank has not received any notice or other information indicating that the Bank is not an “insured depository institution” as defined in 12 U.S.C. Section 1813, nor has any event occurred which could reasonably be expected to adversely affect the status of the Bank as an FDIC-insured institution. 4.1.2 Capital Stock and Related Matters. The Charter of the Company authorizes the Company to issue 50,000,000 shares, consisting of 40,000,000 shares of common stock, $0.01 par value, and 10,000,000 shares of preferred stock, $0.01 par value. As of the date of this Agreement, there are 2,595,289 shares of the Company’s common stock issued and outstanding and no shares of the Company’s preferred stock issued and outstanding. All of the outstanding capital stock of the Company has been duly authorized and validly issued and is fully paid and non-assessable. There are, as of the date hereof, no outstanding options, rights, warrants or other agreements or instruments obligating the Company to issue, deliver or sell, or cause to be issued, delivered or sold, additional shares of the capital stock of the Company or obligating the Company to grant, extend or enter into any such agreement or commitment to any Person other than the Company except pursuant to the Company’s equity incentive plans duly adopted by the Company’s Board of Directors or as otherwise disclosed in the Company’s Reports. 4.2 No Impediment to Transactions. 4.2.1 Transaction is Legal and Authorized. The issuance of the Subordinated Notes, the borrowing of the aggregate of the Subordinated Note Amounts, the execution of the Transaction Documents and compliance by the Company with all of the provisions of the Transaction Documents are within the corporate and other powers of the Company. 4.2.2 Agreement. This Agreement has been duly authorized, executed and delivered by the Company, and, assuming due authorization, execution and delivery by the other parties hereto, constitutes the legal, valid and binding obligations of the Company, enforceable against the Company in accordance with its terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting creditors’ rights generally or by general equitable principles. 4.2.3 Subordinated Notes. The Subordinated Notes have been duly authorized by the Company and when executed by the Company and issued, delivered to and paid for by the Purchasers in accordance with the terms of the Agreement, will have been duly executed, issued and delivered, and will constitute legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting creditors’ rights generally or by general equitable principles. 4.2.4 Exemption from Registration. Neither the Company, nor any of its Subsidiaries or Affiliates, nor any Person acting on its or their behalf, has engaged in any form of general solicitation or general advertising (within the meaning of Regulation D) in connection with 9

the offer or sale of the Subordinated Notes. Assuming the accuracy of the representations and warranties of each Purchaser set forth in this Agreement, the Subordinated Notes will be issued in a transaction exempt from the registration requirements of the Securities Act. No “bad actor” disqualifying event described in Rule 506(d)(1)(i)-(viii) of the Securities Act (a “Disqualification Event”) is applicable to the Company or, to the Company’s knowledge, any Person described in Rule 506(d)(1) (each, a “Company Covered Person”). To the Company’s knowledge, no Company Covered Person is subject to a Disqualification Event. The Company has complied, to the extent applicable, with its disclosure obligations under Rule 506(e). 4.2.5 No Defaults or Restrictions. Neither the execution and delivery of the Transaction Documents by the Company nor compliance by the Company with their respective terms and conditions will (whether with or without the giving of notice or lapse of time or both) (i) violate, conflict with or result in a breach of, or constitute a default under: (1) the Charter or Bylaws of the Company; (2) any of the terms, obligations, covenants, conditions or provisions of any corporate restriction or of any contract, agreement, indenture, note, mortgage, deed of trust, pledge, bank loan or credit agreement, or any other agreement or instrument to which the Company or Bank, as applicable, is now a party or by which it or any of its properties may be bound or affected; (3) any judgment, order, writ, injunction, decree or demand of any court, arbitrator, grand jury, or Governmental Agency applicable to the Company or the Bank; or (4) any statute, rule or regulation applicable to the Company, except, in the case of items (2), (3) or (4), for such violations and conflicts, breaches and default that would not reasonably be expected to, singularly or in the aggregate, result in a Material Adverse Effect, or (ii) result in the creation or imposition of any lien, charge or encumbrance of any nature whatsoever upon any property or asset of the Company. Neither the Company nor the Bank is in default in the performance, observance or fulfillment of any of the terms, obligations, covenants, conditions or provisions contained in any indenture, note or other agreement or instrument creating, evidencing or securing Indebtedness of any kind or pursuant to which any such Indebtedness is issued, or any other agreement or instrument to which the Company or the Bank, as applicable, is a party or by which the Company or the Bank, as applicable, or any of its properties may be bound or affected, except, in each case, only such defaults that would not reasonably be expected to, singularly or in the aggregate, result in a Material Adverse Effect. 4.2.6 Governmental Consent. No governmental orders, permissions, consents, approvals or authorizations are required to be obtained by the Company that have not been obtained, and no registrations or declarations are required to be filed by the Company that have not been filed in connection with, or, in contemplation of, the execution and delivery of, and performance under, the Transaction Documents, except for applicable requirements, if any, of the Securities Act, the Exchange Act or state securities laws or “blue sky” laws of the various states and any applicable federal or state banking laws and regulations. 4.3 Possession of Licenses and Permits. The Company and its Subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, “Governmental Licenses”) issued by the appropriate Governmental Agencies necessary to conduct the business as described in the Company’s Reports except where the failure to possess such Governmental Licenses would not reasonably be expected to, singularly or in the aggregate, have a Material Adverse Effect. The Company and each Subsidiary of the Company is in compliance with the terms and conditions of all such Governmental Licenses, except where the failure so to comply 10

would not reasonably be expected to, individually or in the aggregate, have a Material Adverse Effect. All of the Governmental Licenses are valid and in full force and effect, except where the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect would not reasonably be expected to have a Material Adverse Effect. Neither the Company nor any Subsidiary of the Company has received any notice of proceedings relating to the revocation or modification of any such Governmental Licenses. 4.4 Financial Condition. 4.4.1 Company Financial Statements. The financial statements of the Company included in the Company’s Reports (including the related notes, where applicable), which have been made available to the Purchasers (i) have been prepared from, and are in accordance with, the books and records of the Company; (ii) fairly present in all material respects the results of operations, cash flows, changes in stockholders’ equity and financial position of the Company and its consolidated Subsidiaries, for the respective fiscal periods or as of the respective dates therein set forth (subject in the case of unaudited statements to recurring year-end audit adjustments normal in nature and amount), as applicable; (iii) complied as to form, as of their respective dates of filing in all material respects with applicable accounting and banking requirements as applicable, with respect thereto; and (iv) have been prepared in accordance with GAAP consistently applied during the periods involved, except, in each case, (x) as indicated in such statements or in the notes thereto and (y) for any statement therein or omission therefrom that was corrected, amended, or supplemented or otherwise disclosed or updated in a subsequent Company’s Report. The books and records of the Company have been, and are being, maintained in all material respects in accordance with GAAP and any other applicable legal and accounting requirements. The Company does not have any material liability of any nature whatsoever (whether absolute, accrued, contingent or otherwise and whether due or to become due), except for those liabilities that are reflected or reserved against on the consolidated balance sheet of the Company contained in the Company’s Reports for the Company’s most recently completed quarterly or annual fiscal period, as applicable, and for liabilities incurred in the ordinary course of business consistent with past practice or in connection with the Transaction Documents and the transactions contemplated hereby and thereby. 4.4.2 Absence of Default. Since the date of the last audited financial statements included in the Company’s Reports, no event has occurred which either of itself or with the lapse of time or the giving of notice or both, would give any creditor of the Company the right to accelerate the maturity of any material Indebtedness of the Company. The Company is not in default under any Lease, agreement or instrument, or any law, rule, regulation, order, writ, injunction, decree, determination or award, except for such defaults as would not reasonably be expected to result in a Material Adverse Effect. 4.4.3 Solvency. After giving effect to the consummation of the transactions contemplated by this Agreement, the Company has capital sufficient to carry on its business and transactions and is solvent and able to pay its debts as they mature. No transfer of property is being made and no Indebtedness is being incurred in connection with the transactions contemplated by this Agreement with the intent to hinder, delay or defraud either present or future creditors of the Company or any Subsidiary of the Company. 11

4.4.4 Ownership of Property. The Company and each of its Subsidiaries has good and marketable title as to all real property owned by it and good title to all assets and properties owned by the Company and such Subsidiary in the conduct of its businesses, whether such assets and properties are real or personal, tangible or intangible, including assets and property reflected in the most recent balance sheet contained in the Company’s Reports or acquired subsequent thereto (except to the extent that such assets and properties have been disposed of in the ordinary course of business, since the date of such balance sheet), subject to no encumbrances, liens, mortgages, security interests or pledges, except (i) those items which secure liabilities for public or statutory obligations or any discount with, borrowing from or other obligations to the Federal Home Loan Bank, inter-bank credit facilities, reverse repurchase agreements or any transaction by the Bank acting in a fiduciary capacity, (ii) statutory liens for amounts not yet delinquent or which are being contested in good faith and (iii) as would not reasonably be expected to, individually or in the aggregate, materially and adversely affect the value of such property and do not materially interfere with the use made and proposed to be made of such property by the Company or any of its Subsidiaries. The Company and each of its Subsidiaries, as lessee, has the right under valid and existing Leases of real and personal properties that are material to the Company or such Subsidiary, as applicable, in the conduct of its business to occupy or use all such properties as presently occupied and used by it. Such existing Leases and commitments to Lease constitute or will constitute operating Leases for both tax and financial accounting purposes except as otherwise disclosed in the Company’s Reports and the Lease expense and minimum rental commitments with respect to such Leases and Lease commitments are as disclosed in all material respects in the Company’s Reports. 4.5 No Material Adverse Change. Since the end of the latest audited financial statements included in the Company’s Reports, there has been no development or event which has had or would reasonably be expected to have a Material Adverse Effect. 4.6 Legal Matters. 4.6.1 Compliance with Law. The Company and each of its Subsidiaries (i) has complied with and (ii) to the Company’s knowledge, is not under investigation with respect to, and, to the Company’s knowledge, has not been threatened to be charged with or given any notice of any material violation of, any applicable statutes, rules, regulations, orders and restrictions of any domestic or foreign government, or any instrumentality or agency thereof, having jurisdiction over the conduct of its business or the ownership of its properties, except where any such failure to comply or violation would not reasonably be expected to have a Material Adverse Effect. The Company and each of its Subsidiaries is in compliance with, and at all times prior to the date hereof has been in compliance with (x) all statutes, rules regulations, orders and restrictions of any domestic or foreign government, or any Governmental Agency, applicable to it, and (y) its own privacy policies and written commitments to customers, consumers and employees, concerning data protection, the privacy and security of personal data, and the nonpublic personal information of its customers, consumers and employees, in each case except where any such failure to comply would not reasonably be expected to result, individually or in the aggregate, in a Material Adverse Effect. At no time during the two years prior to the date hereof has the Company or any of its Subsidiaries received any written notice asserting any violations of any of the foregoing. 12

4.6.2 Regulatory Enforcement Actions. The Company, the Bank and its other Subsidiaries are in compliance in all material respects with all laws administered by and regulations of any Governmental Agency applicable to it or to them, the failure to comply with which would not reasonably be expected to have a Material Adverse Effect. None of the Company, the Bank, the Company’s or the Bank’s Subsidiaries nor any of their officers or directors is now operating under any restrictions, agreements, memoranda, commitment letter, supervisory letter or similar regulatory correspondence, or other commitments (other than restrictions of general application) imposed by any Governmental Agency, nor are, to the Company’s knowledge any such restrictions threatened, or any agreements, memoranda or commitments being sought by any Governmental Agency. To the Company’s knowledge, no legal or regulatory violations previously identified by, or penalties or other remedial action previously imposed by, any Governmental Agency remains unresolved. 4.6.3 Pending Litigation. There are no actions, suits, proceedings or written agreements pending, or, to the Company’s knowledge, threatened or proposed, against the Company or any of its Subsidiaries at law or in equity or before or by any Governmental Agency, that would reasonably be expected to have a Material Adverse Effect, or materially and adversely affect the issuance or payment of the Subordinated Notes; and neither the Company nor any of its Subsidiaries is a party to or named as subject to the provisions of any order, writ, injunction, or decree of, or any written agreement with, any arbitrator, court, federal, state, county or local governmental department, commission, board, Regulatory Agency, domestic or foreign, that either separately or in the aggregate, could reasonably be expected to result in a Material Adverse Effect. 4.6.4 Environmental. Except as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect, (i) no Property is or, to the Company’s knowledge, has been a site for the use, generation, manufacture, storage, treatment, release, threatened release, discharge, disposal, transportation or presence of any Hazardous Materials and neither the Company nor any of its Subsidiaries has engaged in such activities, and (ii) there are no claims or actions pending or, to the Company’s knowledge, threatened against the Company or any of its Subsidiaries by any Governmental Agency or by any other Person relating to any Hazardous Materials or pursuant to any Hazardous Materials Law. 4.6.5 Brokerage Commissions. Except for commissions paid to the Placement Agent, neither the Company nor any Affiliate of the Company is obligated to pay any brokerage commission or finder’s fee to any Person in connection with the transactions contemplated by this Agreement. 4.6.6 Investment Company Act. Neither the Company nor any of its Subsidiaries is an “investment company” or a company “controlled” by an “investment company,” within the meaning of the Investment Company Act of 1940, as amended. 4.7 No Misstatement. No information, exhibit, report, schedule or document (including the risk factors disclosure attached hereto as Exhibit C (the “Risk Factors”)), when viewed together as a whole, furnished or made available by Company to Purchasers in connection with the negotiation, execution or performance of the Transaction Documents contains any untrue statement of a material fact, or omits to state a material fact necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading, 13

except for any statement therein or omission therefrom which was corrected, amended or supplemented or otherwise disclosed or updated in a subsequent exhibit, report, schedule or document furnished or made available to Purchasers prior to the date hereof. 4.8 Internal Accounting Controls. The Company, the Bank and each other material Subsidiary have established and maintain a system of internal control over financial reporting that pertains to the maintenance of records that accurately and fairly reflect the transactions and dispositions of the Company’s assets (on a consolidated basis), provides reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that the Company’s and the Bank’s receipts and expenditures and receipts and expenditures of each of the Company’s other Subsidiaries are being made only in accordance with authorizations of the Company management and Board of Directors, and provides reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets of the Company on a consolidated basis that could have a Material Adverse Effect. Such internal control over financial reporting is effective to provide reasonable assurance regarding the reliability of the Company’s financial reporting and the preparation of the Company’s financial statements for external purposes in accordance with GAAP. Since the conclusion of the Company’s last completed fiscal year there has not been and there currently is not (i) any significant deficiency or material weakness in the design or operation of its internal control over financial reporting which is reasonably likely to adversely affect its ability to record, process, summarize and report financial information, or (ii) any fraud, whether or not material, that involves management or other employees who have a role in the Company’s or the Bank’s internal control over financial reporting. The Company (A) has implemented and maintains disclosure controls and procedures reasonably designed and maintained to ensure that material information relating to the Company is made known to the Chief Executive Officer and the Chief Financial Officer of the Company by others within the Company and (B) has disclosed, based on its most recent evaluation prior to the date hereof, to the Company’s outside auditors and the audit committee of the Company’s Board of Directors (x) any significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the Company’s internal controls over financial reporting. Such disclosure controls and procedures are effective for the purposes for which they were established. 4.9 Tax Matters. The Company, the Bank and each other Subsidiary of the Company have (i) filed all material foreign, U.S. federal, state and local tax returns, information returns and similar reports that are required to be filed, and all such tax returns are true, correct and complete in all material respects, and (ii) paid all material taxes required to be paid by it and any other material assessment, fine or penalty levied against it other than taxes (x) currently payable without penalty or interest, or (y) being contested in good faith by appropriate proceedings. 4.10 Exempt Offering. Assuming the accuracy of the Purchasers’ representations and warranties set forth in this Agreement, no registration under the Securities Act or qualification under the Trust Indenture Act is required for the offer and sale of the Subordinated Notes by the Company to the Purchasers. 4.11 Representations and Warranties Generally. The representations and warranties of the Company set forth in this Agreement or in any other document delivered to the Purchasers 14

by or on behalf of the Company pursuant to or in connection with this Agreement are true and correct as of the Closing Date and as otherwise specifically provided herein or therein. 5. GENERAL COVENANTS, CONDITIONS AND AGREEMENTS. The Company hereby further covenants and agrees with each Purchaser as follows: 5.1 Compliance with Transaction Documents. The Company shall comply with, observe and timely perform each and every one of the covenants, agreements and obligations under the Transaction Documents. 5.2 Affiliate Transactions. The Company shall not itself, nor shall it cause, permit or allow any of its Subsidiaries to enter into any material transaction, including, the purchase, sale or exchange of property or the rendering of any service, with any Affiliate of the Company except in the ordinary course of business and pursuant to the reasonable requirements of the Company’s or such Affiliate’s business and upon terms consistent with applicable laws and regulations and reasonably found by the appropriate board(s) of directors to be fair and reasonable and no less favorable to the Company or such Affiliate than would be obtained in a comparable arm’s length transaction with a Person not an Affiliate. 5.3 Compliance with Laws. 5.3.1 Generally. The Company shall comply and cause the Bank and each of its other Subsidiaries to comply in all material respects with all applicable statutes, rules, regulations, orders and restrictions in respect of the conduct of its business and the ownership of its properties, except, in each case, where such noncompliance would not reasonably be expected to have a Material Adverse Effect. 5.3.2 Regulated Activities. The Company shall not itself, nor shall it cause, permit or allow the Bank or any other of its Subsidiaries to (i) engage in any business or activity not permitted by all applicable laws and regulations, except where such business or activity would not reasonably be expected to have a Material Adverse Effect, or (ii) make any loan or advance secured by the capital stock of another bank or depository institution, or acquire the capital stock, assets or obligations of or any interest in another bank or depository institution, in each case other than in accordance with applicable laws and regulations and safe and sound banking practices. 5.3.3 Taxes. The Company shall and shall cause the Bank and any other of its Subsidiaries to promptly pay and discharge all taxes, assessments and other governmental charges imposed upon the Company, the Bank or any other of its Subsidiaries or upon the income, profits, or property of the Company or any Subsidiary and all claims for labor, material or supplies which, if unpaid, might by law become a lien or charge upon the property of the Company, the Bank or any other of its Subsidiaries. Notwithstanding the foregoing, none of the Company, the Bank or any other of its Subsidiaries shall be required to pay any such tax, assessment, charge or claim, so long as the validity thereof shall be contested in good faith by appropriate proceedings, and appropriate reserves therefor shall be maintained on the books of the Company, the Bank or such other Subsidiary, as the case may be. 15

5.5 Absence of Control. It is the intent of the parties to this Agreement that in no event shall the Purchasers, by reason of any of the Transaction Documents, be deemed to control, directly or indirectly, the Company, and the Purchasers shall not exercise, or be deemed to exercise, directly or indirectly, a controlling influence over the management or policies of the Company. 5.6 Secondary Market Transactions. Each Purchaser shall have the right at any time and from time to time to securitize its Subordinated Notes or any portion thereof in a single asset securitization or a pooled loan securitization of rated single or multi-class securities secured by or evidencing ownership interests in the Subordinated Notes (each such securitization is referred to herein as a “Secondary Market Transaction”). In connection with any such Secondary Market Transaction, the Company shall, at the Company’s expense, cooperate with the Purchasers and otherwise reasonably assist the Purchasers in satisfying the market standards to which Purchasers customarily adhere or which may be reasonably required in the marketplace or by applicable rating agencies in connection with any such Secondary Market Transaction, but in no event shall the Company be required to incur more than $5,000 (without reimbursement) in costs or expenses in connection therewith. Subject to any written confidentiality obligation, all information regarding the Company may be furnished, without liability except in the case of gross negligence or willful misconduct, to any the Purchaser and to any Person reasonably deemed necessary by Purchaser in connection with participation in such Secondary Market Transaction. All documents, financial statements, appraisals and other data relevant to the Company or the Subordinated Notes may be retained by any such Person, subject to the terms of any applicable confidentiality agreements. 5.7 Bloomberg. The Company shall use commercially reasonable efforts to cause within 90 days after the Closing the Subordinated Notes to be quoted on Bloomberg. 5.8 Rule 144A Information. While any Subordinated Notes remain “restricted securities” within the meaning of the Securities Act, the Company will make available, upon request, to any seller of such Subordinated Notes the information specified in Rule 144A(d)(4) under the Securities Act, unless the Company is then subject to Section 13 or 15(d) of the Exchange Act. 5.9 DTC Eligibility. The Company shall use commercially reasonable efforts to provide that the Subordinated Notes owned by Noteholders that are Qualified Institutional Buyers within the meaning of Rule 144A under the Securities Act (“QIBs”) shall be issued in the form of one or more Global Notes registered in the name of The Depository Trust Company (“DTC”) or another organization registered as a clearing agency under the Exchange Act, and designated as depositary by the Company or any successor thereto or a nominee thereof and delivered to such depositary or a nominee thereof. 5.10 Rating. So long as any Subordinated Notes remain outstanding, the Company will use commercially reasonable efforts to maintain a rating by a nationally recognized statistical rating organization. 17

6. REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE PURCHASERS. Each Purchaser hereby represents and warrants to the Company, and covenants with the Company, severally and not jointly, as follows: 6.1 Legal Power and Authority. It has all necessary power and authority to execute, deliver and perform its obligations under this Agreement and to consummate the transactions contemplated hereby. It is an entity duly organized, validly existing and in good standing under the laws of its jurisdiction of organization. 6.2 Authorization and Execution. The execution, delivery and performance of this Agreement has been duly authorized by all necessary action on the part of such Purchaser, and, assuming due authorization, execution and delivery by the other parties hereto, this Agreement is a legal, valid and binding obligation of such Purchaser, enforceable against such Purchaser in accordance with its terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting creditors’ rights generally or by general equitable principles. 6.3 No Conflicts. Neither the execution, delivery or performance of the Transaction Documents nor the consummation of any of the transactions contemplated thereby will conflict with, violate, constitute a breach of or a default (whether with or without the giving of notice or lapse of time or both) under (i) its organizational documents, (ii) any agreement to which it is party, (iii) any law applicable to it or (iv) any order, writ, judgment, injunction, decree, determination or award binding upon or affecting it. 6.4 Purchase for Investment. It is purchasing the Subordinated Note for its own account and not with a view to distribution and with no present intention of reselling, distributing or otherwise disposing of the same. It has no present or contemplated agreement, undertaking, arrangement, obligation, Indebtedness or commitment providing for, or which is likely to compel, a disposition of the Subordinated Notes in any manner. 6.5 Institutional Accredited Investor. It is and will be on the Closing Date (i) an institutional “accredited investor” as such term is defined in Rule 501(a) of Regulation D and as contemplated by subsections (1), (2), (3) and (7) of Rule 501(a) of Regulation D, and has no less than $5,000,000 in total assets, or (ii) a QIB. 6.6 Financial and Business Sophistication. It has such knowledge and experience in financial and business matters that it is capable of evaluating the merits and risks of the prospective investment in the Subordinated Notes and of making an informed investment decision, and has so evaluated the merits and risks of such investment. It has relied solely upon its own knowledge of, and/or the advice of its own legal, financial or other advisors with regard to, the legal, financial, tax and other considerations involved in deciding to invest in the Subordinated Notes. 6.7 Ability to Bear Economic Risk of Investment. It recognizes that an investment in the Subordinated Notes is a speculative investment that involves substantial risk, including risks related to the Company’s business, operating results, financial condition and cash flows, including without limitation those described in the Company’s Reports as well as those Risk Factors set forth 18

law or equity. No notice or demand on the Company in any case shall, in itself, entitle the Company to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the Purchasers to any other or further action in any circumstances without notice or demand. No consent or waiver, expressed or implied, by the Purchasers to or of any breach or default by the Company in the performance of its obligations hereunder shall be deemed or construed to be a consent or waiver to or of any other breach or default in the performance of the same or any other obligations of the Company hereunder. Failure on the part of the Purchasers to complain of any acts or failure to act or to declare an Event of Default, irrespective of how long such failure continues, shall not constitute a waiver by the Purchasers of their rights hereunder or impair any rights, powers or remedies on account of any breach or default by the Company. 7.4 Required Waiver Disclosure. Appendix A hereto sets forth certain disclosures relating to the Placement Agent that the Company is required to provide to the Purchasers. 7.5 Severability. Any provision of this Agreement which is unenforceable or invalid or contrary to law, or the inclusion of which would adversely affect the validity, legality or enforcement of this Agreement, shall be of no effect and, in such case, all the remaining terms and provisions of this Agreement shall subsist and be fully effective according to the tenor of this Agreement the same as though any such invalid portion had never been included herein. Notwithstanding any of the foregoing to the contrary, if any provisions of this Agreement or the application thereof are held invalid or unenforceable only as to particular persons or situations, the remainder of this Agreement, and the application of such provision to persons or situations other than those to which it shall have been held invalid or unenforceable, shall not be affected thereby, but shall continue valid and enforceable to the fullest extent permitted by law. 7.6 Notices. Any notice which any party hereto may be required or may desire to give hereunder shall be deemed to have been given if in writing and if delivered personally, or if mailed, postage prepaid, by United States registered or certified mail, return receipt requested, or if delivered by a responsible overnight commercial courier promising next business day delivery, addressed: if to the Company: Sound Financial Bancorp, Inc. 0000 Xxxxx Xxxxxx, Xxxxx 000 Xxxxxxx, XX 00000 Tel: (000) 000-0000 Attention: Xxxxx (Xxxxxx) Xxx Xxxxxxx President and Chief Executive Officer with a copy to: Silver, Xxxxxxxx, Taff & Xxxxxxx LLP 0000 X Xxxxxx, XX, Xxxxx 000 Xxxxxxxxxx, X.X. 00000 Tel: (000) 000-0000 Attention: Xxxxxxx X. Xxxxx, Esquire if to the Purchasers: To the address indicated on such Purchaser’s signature page. 22

or to such other address or addresses as the party to be given notice may have furnished in writing to the party seeking or desiring to give notice, as a place for the giving of notice; provided that no change in address shall be effective until five (5) Business Days after being given to the other party in the manner provided for above. Any notice given in accordance with the foregoing shall be deemed given when delivered personally or, if mailed, three (3) Business Days after it shall have been deposited in the United States mails as aforesaid or, if sent by overnight courier, the Business Day following the date of delivery to such courier (provided next business day delivery was requested). 7.7 Successors and Assigns. This Agreement shall inure to the benefit of the parties and their respective heirs, legal representatives, successors and assigns; except that (i) unless a Purchaser consents in writing, no assignment made by the Company in violation of this Agreement shall be effective or confer any rights on any purported assignee of the Company, and (ii) unless such assignment complies with the Assignment Form attached to the Subordinated Notes, no assignment made by a Purchaser shall be effective or confer any rights on any purported assignee of Purchaser. The term “successors and assigns” will not include a purchaser of any of the Subordinated Notes from any Purchaser merely because of such purchase but shall include a purchaser of any of the Subordinated Notes pursuant to an assignment complying with the Assignment Form attached to the Subordinated Notes. 7.8 No Joint Venture. Nothing contained herein or in any document executed pursuant hereto and no action or inaction whatsoever on the part of a Purchaser, shall be deemed to make a Purchaser a partner or joint venturer with the Company. 7.9 Documentation. All documents and other matters required by any of the provisions of this Agreement to be submitted or furnished to a Purchaser shall be in form and substance satisfactory to such Purchaser. 7.10 Entire Agreement. This Agreement and the Subordinated Notes, along with any exhibits hereto and thereto, constitute the entire agreement between the parties hereto with respect to the subject matter hereof and may not be modified or amended in any manner other than by supplemental written agreement executed by the parties hereto. No party, in entering into this Agreement, has relied upon any representation, warranty, covenant, condition or other term that is not set forth in this Agreement or in the Subordinated Notes. 7.11 Choice of Law. This Agreement shall be governed by and construed in accordance with the laws of the State of New York without giving effect to its laws or principles of conflict of laws. Nothing herein shall be deemed to limit any rights, powers or privileges which a Purchaser may have pursuant to any law of the United States of America or any rule, regulation or order of any department or agency thereof and nothing herein shall be deemed to make unlawful any transaction or conduct by a Purchaser which is lawful pursuant to, or which is permitted by, any of the foregoing. 7.12 No Third Party Beneficiary. This Agreement is made for the sole benefit of the Company and the Purchasers, and no other Person shall be deemed to have any privity of contract hereunder nor any right to rely hereon to any extent or for any purpose whatsoever, nor shall any other Person have any right of action of any kind hereon or be deemed to be a third party 23

beneficiary hereunder; provided, that the Placement Agent may rely on the representations and warranties contained herein to the same extent as if it were a party to this Agreement. 7.13 Legal Tender of United States. All payments hereunder shall be made in coin or currency which at the time of payment is legal tender in the United States of America for public and private debts. 7.14 Captions; Counterparts. Captions contained in this Agreement in no way define, limit or extend the scope or intent of their respective provisions. This Agreement may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed and delivered shall be deemed to be an original and all of which taken together shall constitute but one and the same instrument. In the event that any signature on this Agreement in favor of the Purchasers and all other documents delivered hereunder (other than the Subordinated Notes) is delivered by facsimile transmission, or by e-mail delivery of a “.pdf” format data file, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such facsimile signature page were an original thereof. Notwithstanding the foregoing, if any Purchaser shall request manually signed counterpart signatures to any document hereunder, the Company hereby agrees to use its reasonable endeavors to provide such manually signed signature pages as soon as reasonably practicable. 7.15 Knowledge; Discretion. All references herein to a Purchaser’s or the Company’s knowledge shall be deemed to mean the knowledge of such party based on the actual knowledge of such party’s Chief Executive Officer and Chief Financial Officer or such other persons holding equivalent offices. Unless specified to the contrary herein, all references herein to an exercise of discretion or judgment by a Purchaser, to the making of a determination or designation by a Purchaser, to the application of a Purchaser’s discretion or opinion, to the granting or withholding of a Purchaser’s consent or approval, to the consideration of whether a matter or thing is satisfactory or acceptable to a Purchaser, or otherwise involving the decision making of a Purchaser, shall be deemed to mean that such Purchaser shall decide using the reasonable discretion or judgment of a prudent lender. 7.16 Waiver Of Right To Jury Trial. TO THE EXTENT PERMITTED UNDER APPLICABLE LAW, THE PARTIES HERETO HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHT THAT THEY MAY HAVE TO A TRIAL BY JURY IN ANY LITIGATION ARISING IN ANY WAY IN CONNECTION WITH ANY OF THE TRANSACTION DOCUMENTS, OR ANY OTHER STATEMENTS OR ACTIONS OF THE COMPANY OR THE PURCHASERS. THE PARTIES ACKNOWLEDGE THAT THEY HAVE BEEN REPRESENTED IN THE SIGNING OF THIS AGREEMENT AND IN THE MAKING OF THIS WAIVER BY INDEPENDENT LEGAL COUNSEL SELECTED OF THEIR OWN FREE WILL. THE PARTIES FURTHER ACKNOWLEDGE THAT (I) THEY HAVE READ AND UNDERSTAND THE MEANING AND RAMIFICATIONS OF THIS WAIVER, (II) THIS WAIVER HAS BEEN REVIEWED BY THE PARTIES AND THEIR COUNSEL AND IS A MATERIAL INDUCEMENT FOR ENTRY INTO THIS AGREEMENT AND (III) THIS WAIVER SHALL BE EFFECTIVE AS TO EACH OF SUCH TRANSACTION DOCUMENTS AS IF FULLY INCORPORATED THEREIN. 24

7.17 Expenses. Except as otherwise provided in this Agreement, each of the parties will bear and pay all other costs and expenses incurred by it or on its behalf in connection with the transactions contemplated pursuant to this Agreement. 7.18 Survival. Each of the representations and warranties set forth in this Agreement shall survive the consummation of the transactions contemplated hereby for a period of one year after the date hereof. Except as otherwise provided herein, all covenants and agreements contained herein shall survive until, by their respective terms, they are no longer operative. [Signature Pages Follow] 25

IN WITNESS WHEREOF, the Company has caused this Subordinated Note Purchase Agreement to be executed by its duly authorized representative as of the date first above written. COMPANY: SOUND FINANCIAL BANCORP, INC. By: Name: Xxxxx Xxx Xxxxxxx Title: President and Chief Executive Officer [Company Signature Page to Subordinated Note Purchase Agreement]

IN WITNESS WHEREOF, the Purchaser has caused this Subordinated Note Purchase Agreement to be executed by its duly authorized representative as of the date first above written. PURCHASER: [INSERT PURCHASER’S NAME] By: Name: [●] Title: [●] Address of Purchaser: [●] Principal Amount of Purchased Subordinated Note: $[●] [Purchaser Signature Page to Subordinated Note Purchase Agreement]

EXHIBIT A FORM OF SUBORDINATED NOTE SOUND FINANCIAL BANCORP, INC. 5.25% FIXED-TO-FLOATING RATE SUBORDINATED NOTE DUE OCTOBER 1, 2030 THE INDEBTEDNESS EVIDENCED BY THIS SUBORDINATED NOTE IS SUBORDINATED AND JUNIOR IN RIGHT OF PAYMENT TO SENIOR INDEBTEDNESS (AS DEFINED IN SECTION 3 OF THIS SUBORDINATED NOTE) OF SOUND FINANCIAL BANCORP, INC. (THE “COMPANY”), INCLUDING OBLIGATIONS OF THE COMPANY TO ITS GENERAL CREDITORS AND SECURED CREDITORS, AND IS UNSECURED. IT IS INELIGIBLE AS COLLATERAL FOR ANY EXTENSION OF CREDIT BY THE COMPANY OR ANY OF ITS SUBSIDIARIES. IN THE EVENT OF LIQUIDATION ALL HOLDERS OF SENIOR INDEBTEDNESS OF THE COMPANY SHALL BE ENTITLED TO BE PAID IN FULL WITH SUCH INTEREST AS MAY BE PROVIDED BY LAW BEFORE ANY PAYMENT SHALL BE MADE ON ACCOUNT OF PRINCIPAL OF OR INTEREST ON THIS SUBORDINATED NOTE. AFTER PAYMENT IN FULL OF ALL SUMS OWING TO SUCH HOLDERS OF SENIOR INDEBTEDNESS, THE HOLDER OF THIS SUBORDINATED NOTE, TOGETHER WITH THE HOLDERS OF ANY OBLIGATIONS OF THE COMPANY RANKING ON A PARITY WITH THE SUBORDINATED NOTES, SHALL BE ENTITLED TO BE PAID FROM THE REMAINING ASSETS OF THE COMPANY THE UNPAID PRINCIPAL AMOUNT OF THIS SUBORDINATED NOTE PLUS ACCRUED AND UNPAID INTEREST THEREON BEFORE ANY PAYMENT OR OTHER DISTRIBUTION, WHETHER IN CASH, PROPERTY OR OTHERWISE, SHALL BE MADE (I) WITH RESPECT TO ANY OBLIGATION THAT BY ITS TERMS EXPRESSLY IS JUNIOR IN THE RIGHT OF PAYMENT TO THE SUBORDINATED NOTES, (II) WITH RESPECT TO ANY INDEBTEDNESS BETWEEN THE COMPANY AND ANY OF ITS SUBSIDIARIES OR AFFILIATES, OR (III) ON ACCOUNT OF ANY SHARES OF CAPITAL STOCK OF THE COMPANY. THIS SUBORDINATED NOTE IS A GLOBAL SUBORDINATED NOTE WITHIN THE MEANING OF THE PURCHASE AGREEMENT HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF CEDE & CO AS NOMINEE OF THE DEPOSITORY TRUST COMPANY (“DTC”) OR A NOMINEE OF DTC. THIS SUBORDINATED NOTE IS NOT EXCHANGEABLE FOR SUBORDINATED NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN DTC OR ITS NOMINEE AND NO TRANSFER OF THIS SUBORDINATED NOTE (OTHER THAN A TRANSFER OF THIS SUBORDINATED NOTE AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC) MAY BE REGISTERED. THE INDEBTEDNESS EVIDENCED BY THIS SUBORDINATED NOTE IS NOT A DEPOSIT AND IS NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY OR FUND. A-1

THIS SUBORDINATED NOTE WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN MINIMUM DENOMINATIONS OF $250,000 AND MULTIPLES OF $1,000 IN EXCESS THEREOF. ANY ATTEMPTED TRANSFER OF THIS SUBORDINATED NOTE IN A DENOMINATION OF LESS THAN $250,000 SHALL BE DEEMED TO BE VOID AND OF NO LEGAL EFFECT WHATSOEVER. ANY SUCH PURPORTED TRANSFEREE SHALL BE DEEMED NOT TO BE THE HOLDER OF THIS SUBORDINATED NOTE FOR ANY PURPOSE, INCLUDING, BUT NOT LIMITED TO, THE RECEIPT OF PAYMENTS ON THIS SUBORDINATED NOTE, AND SUCH PURPORTED TRANSFEREE SHALL BE DEEMED TO HAVE NO INTEREST WHATSOEVER IN THIS SUBORDINATED NOTE. THIS SUBORDINATED NOTE MAY BE SOLD ONLY IN COMPLIANCE WITH APPLICABLE FEDERAL AND STATE SECURITIES LAWS. THIS SUBORDINATED NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR ANY APPLICABLE STATE SECURITIES LAWS OR ANY OTHER APPLICABLE SECURITIES LAWS. NEITHER THIS SUBORDINATED NOTE NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. CERTAIN ERISA CONSIDERATIONS: THE HOLDER OF THIS SUBORDINATED NOTE, OR ANY INTEREST HEREIN, BY ITS ACCEPTANCE HEREOF OR THEREOF AGREES, REPRESENTS AND WARRANTS THAT IT IS NOT AN EMPLOYEE BENEFIT PLAN, INDIVIDUAL RETIREMENT ACCOUNT OR OTHER PLAN OR ARRANGEMENT SUBJECT TO TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED (“ERISA”), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”) (EACH A “PLAN”), OR AN ENTITY WHOSE UNDERLYING ASSETS INCLUDE “PLAN ASSETS” BY REASON OF ANY PLAN’S INVESTMENT IN THE ENTITY, AND NO PERSON INVESTING “PLAN ASSETS” OF ANY PLAN MAY ACQUIRE OR HOLD THIS SUBORDINATED NOTE OR ANY INTEREST HEREIN, UNLESS SUCH PURCHASER OR HOLDER IS ELIGIBLE FOR THE EXEMPTIVE RELIEF AVAILABLE UNDER U.S. DEPARTMENT OF LABOR PROHIBITED TRANSACTION CLASS EXEMPTION 96-23, 95-60, 91-38, 90-1 OR 84-14 OR ANOTHER APPLICABLE EXEMPTION OR ITS PURCHASE AND HOLDING OF THIS SUBORDINATED A-2

NOTE, OR ANY INTEREST HEREIN, ARE NOT PROHIBITED BY SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE WITH RESPECT TO SUCH PURCHASE AND HOLDING. ANY PURCHASER OR HOLDER OF THIS SUBORDINATED NOTE OR ANY INTEREST HEREIN WILL BE DEEMED TO HAVE REPRESENTED BY ITS PURCHASE AND HOLDING THEREOF THAT EITHER: (I) IT IS NOT AN EMPLOYEE BENEFIT PLAN OR OTHER PLAN TO WHICH TITLE I OF ERISA OR SECTION 4975 OF THE CODE IS APPLICABLE, A TRUSTEE OR OTHER PERSON ACTING ON BEHALF OF ANY SUCH EMPLOYEE BENEFIT PLAN OR PLANS, OR ANY OTHER PERSON OR ENTITY USING THE “PLAN ASSETS” OF ANY SUCH EMPLOYEE BENEFIT PLAN OR PLANS TO FINANCE SUCH PURCHASE OR (II) SUCH PURCHASE OR HOLDING WILL NOT RESULT IN A PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE FOR WHICH FULL EXEMPTIVE RELIEF IS NOT AVAILABLE UNDER APPLICABLE STATUTORY OR ADMINISTRATIVE EXEMPTION. ANY FIDUCIARY OF ANY PLAN WHO IS CONSIDERING THE ACQUISITION OF THIS SUBORDINATED NOTE OR ANY INTEREST HEREIN SHOULD CONSULT WITH HIS OR HER LEGAL COUNSEL PRIOR TO ACQUIRING THIS SUBORDINATED NOTE OR ANY INTEREST HEREIN. A-3

No. 2030-1 CUSIP: (QIB) 00000XXX0 ISIN: US83607AAA88 SOUND FINANCIAL BANCORP, INC. 5.25% FIXED-TO-FLOATING RATE SUBORDINATED NOTE DUE OCTOBER 1, 2030 1. Subordinated Notes. This Subordinated Note is one of an issue of notes of Sound Financial Bancorp, Inc., a Maryland corporation (the “Company”) designated as the “5.25% Fixed- to-Floating Rate Subordinated Notes due October 1, 2030” (the “Subordinated Notes”) issued pursuant to that Subordinated Note Purchase Agreement, dated as of September 18, 2020 by and among the Company and the several purchasers of the Subordinated Notes identified on the signature pages thereto (the “Purchase Agreement”). 2. Payment. (a)(i)The Company, for value received, promises to pay to Cede & Co., or its registered assigns, the principal sum of Twelve Million Dollars (U.S.) ($12,000,000), plus accrued but unpaid interest on October 1, 2030 (“Stated Maturity”) and to pay interest thereon (i) from and including September 18, 2020 (the “Issue Date”) to but excluding October 1, 2025 or the earlier redemption date contemplated by Section 4 of this Subordinated Note, at the rate of 5.25% per annum, computed on the basis of a 360-day year consisting of twelve 30-day months and payable semi-annually (each semi-annual period, a “Fixed Rate Period”) in arrears on April 1 and October 1 of each year (each payment date, a “Fixed Rate Interest Payment Date”), beginning on April 1, 2021 and (ii) from and including October 1, 2025 to but excluding the Stated Maturity or the earlier redemption date contemplated by Section 4 of this Subordinated Note, at the rate per annum, reset quarterly, equal to the Floating Interest Rate (as defined below) determined on the Floating Interest Determination Date (as defined below) of the applicable interest period plus 513 basis points, computed on the basis of a 360-day year and the actual number of days elapsed and payable quarterly in arrears (each quarterly period, a “Floating Rate Period”) on January 1, April 1, July 1 and October 1 of each year (each payment date, a “Floating Rate Interest Payment Date”). Dollar amounts resulting from this calculation shall be rounded to the nearest cent, with one-half cent being rounded up. The term “Floating Interest Determination Date” means the date upon which the Floating Interest Rate is determined by the Calculation Agent (as defined below) pursuant to the Three-Month Term SOFR Conventions (as defined below). Any payment of principal of or interest on this Subordinated Note that would otherwise become due and payable on a day which is not a Business Day (as defined below) shall become due and payable on the next succeeding Business Day, with the same force and effect as if made on the date for payment of such principal or interest, and no interest will accrue in respect of such payment for the period after such day; provided, that in the event that any scheduled Floating Rate Interest Payment Date falls on a day that is not a Business Day and the next succeeding Business Day falls in the next succeeding calendar month, such Floating Rate Interest Payment Date will be accelerated to the immediately preceding Business Day, and, in each such case, the amounts payable on such Business Day will include interest accrued to, but excluding, such Business Day. Dollar amounts resulting from interest calculations will be rounded to the nearest cent, with one half cent being rounded upward. Notwithstanding anything to the contrary, (i) in the event the Three-Month Term SOFR (as defined below) is less than zero, the Three-Month Term SOFR shall be deemed to be zero, and (ii) if a Benchmark Transition Event (as defined below) and its related Benchmark A-4

Replacement Date (as defined below) have occurred and the Benchmark Replacement (as defined below) is less than zero, then the Benchmark Replacement shall be deemed to be zero. (ii) The Company shall take such actions as are necessary to ensure that from the commencement of the Floating Rate Period for so long as any of the Subordinated Notes remain outstanding there will at all times be a Calculation Agent appointed to calculate Three-Month Term SOFR in respect of each Floating Rate Period. The calculation of Three-Month Term SOFR for each applicable Floating Rate Period by the Calculation Agent will (in the absence of manifest error) be final and binding. The Calculation Agent’s determination of any interest rate and its calculation of interest payments for any period will be maintained on file at the Calculation Agent’s principal offices, will be made available to any Noteholder (as defined below) upon request. The Calculation Agent may be removed by the Company at any time. If the Calculation Agent is unable or unwilling to act as Calculation Agent or is removed by the Company, the Company will promptly appoint a replacement Calculation Agent. The Calculation Agent may not resign its duties without a successor having been duly appointed; provided, that if a successor Calculation Agent has not been appointed by the Company and such successor accepted such position within thirty (30) days after the giving of notice of resignation by the Calculation Agent, then the resigning Calculation Agent may petition, at the expense of the Company, any court of competent jurisdiction for the appointment of a successor Calculation Agent with respect to such series. For the avoidance of doubt, if at any time there is no Calculation Agent appointed by the Company, then the Company shall be the Calculation Agent. (b) An “Interest Payment Date” is either a Fixed Rate Interest Payment Date or a Floating Rate Interest Payment Date, as applicable. (c) The “Floating Interest Rate” means: (i) initially Three-Month Term SOFR (as defined below). (ii) Notwithstanding the foregoing clause (i) of this Section 2(c): (1) If the Calculation Agent determines prior to the relevant Floating Interest Determination Date that a Benchmark Transition Event and its related Benchmark Replacement Date (each of such terms as defined below) have occurred with respect to Three- Month Term SOFR, then the Company shall promptly provide notice of such determination to the Noteholders and Section 2(d) will thereafter apply to all determinations, calculations and quotations made or obtained for the purposes of calculating the Floating Interest Rate payable on the Subordinated Notes during a relevant Floating Rate Period. (2) However, if the Calculation Agent determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR, but for any reason the Benchmark Replacement has not been determined as of the relevant Floating Interest Determination Date, the Floating Interest Rate for the applicable Floating Rate Period will be equal to the Floating Interest Rate on the last Floating Interest Determination Date for the Subordinated Notes, as determined by the Calculation Agent. A-5

(v) For the avoidance of doubt and subject to the last sentence of Section 2(a)(i), after a Benchmark Transition Event and its related Benchmark Replacement Date have occurred, interest payable on this Subordinated Note for the Floating Rate Period will be an annual rate equal to the sum of the applicable Benchmark Replacement plus 513 basis points. (vi) As used in this Subordinated Note: (1) “Benchmark” means, initially, Three-Month Term SOFR; provided that if the Calculation Agent determines on or prior to the Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement. (2) “Benchmark Replacement” means the Interpolated Benchmark with respect to the then-current Benchmark; provided that if (a) the Calculation Agent cannot determine the Interpolated Benchmark as of the Benchmark Replacement Date or (b) the then-current Benchmark is Three-Month Term SOFR and a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR (in which event no Interpolated Benchmark with respect to Three-Month Term SOFR shall be determined), then “Benchmark Replacement” means the first alternative set forth in the order below that can be determined by the Calculation Agent as of the Benchmark Replacement Date: a. The sum of: (i) Compounded SOFR and (ii) the Benchmark Replacement Adjustment; b. the sum of: (i) the alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then- current Benchmark for the applicable Corresponding Tenor and (ii) the Benchmark Replacement Adjustment; c. the sum of: (i) the ISDA Fallback Rate and (ii) the Benchmark Replacement Adjustment; and d. the sum of: (i) the alternate rate of interest that has been selected by the Calculation Agent as the replacement for the then-current Benchmark for the applicable Corresponding Tenor giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar denominated floating rate securities at such time and (ii) the Benchmark Replacement Adjustment. (3) “Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by the Calculation Agent as of the Benchmark Replacement Date: a. the spread adjustment, or method for calculating or determining such spread adjustment, (which may be a positive or negative value or zero) that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement; A-7

b. if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, then the ISDA Fallback Adjustment; and c. the spread adjustment (which may be a positive or negative value or zero) that has been selected by the Calculation Agent giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar denominated floating rate securities at such time. (4) “Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definition of “Floating Rate Period,” timing and frequency of determining rates with respect to each Floating Rate Period and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Calculation Agent decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Calculation Agent decides that adoption of any portion of such market practice is not administratively feasible or if the Calculation Agent determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Calculation Agent determines is reasonably necessary). (5) “Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark: a. in the case of clause (a) of the definition of “Benchmark Transition Event,” the relevant Reference Time in respect of any determination; or b. in the case of clause (b) or (c) of the definition of “Benchmark Transition Event,” the later of (i) the date of the public statement or publication of information referenced therein and (ii) the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark; or c. in the case of clause (d) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein. For the avoidance of doubt, for purposes of the definitions of Benchmark Replacement Date and Benchmark Transition Event, references to the Benchmark also include any reference rate underlying the Benchmark (for example, if the Benchmark becomes Compounded SOFR, references to the Benchmark would include SOFR). For the avoidance of doubt, if the event giving rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination. (6) “Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark: A-8

a. if the Benchmark is Three-Month Term SOFR, (i) the Relevant Governmental Body has not selected or recommended a forward-looking term rate for a tenor of three months based on SOFR, (ii) the development of a forward-looking term rate for a tenor of three months based on SOFR that has been recommended or selected by the Relevant Governmental Body is not complete or (iii) the Company determines that use of a forward-looking rate for a tenor of three months based on SOFR is not administratively feasible; b. a public statement or publication of information by or on behalf of the administrator of the Benchmark announcing that such administrator has ceased or will cease to provide the Benchmark, permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark; c. a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark, the central bank for the currency of the Benchmark, an insolvency official with jurisdiction over the administrator for the Benchmark, a resolution authority with jurisdiction over the administrator for the Benchmark or a court or an entity with similar insolvency or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark has ceased or will cease to provide the Benchmark permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark; or d. a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative. (7) “Business Day” means any day that is not a Saturday or Sunday and that is not a day on which banks in the State of Washington are generally authorized or required by law or executive order to be closed. (8) “Calculation Agent” means the agent (which may be the Company or an affiliate of the Company) as may be appointed by the Company to act as Calculation Agent for the Subordinated Notes prior to the commencement of the Floating Rate Period to act in accordance with Section 2. (9) “Compounded SOFR” means the compounded average of SOFRs for the applicable Corresponding Tenor, with the rate, or methodology for this rate, and conventions for this rate being established by the Calculation Agent in accordance with: a. the rate, or methodology for this rate and conventions for this rate selected or recommended by the Relevant Governmental Body for determining compounded SOFR; provided that: b. if, and to the extent that, the Calculation Agent determines that Compounded SOFR cannot be determined in accordance with clause (a) above, then the rate, or methodology for this rate, and conventions for this rate that have been selected by the A-9

Calculation Agent giving due consideration to any industry-accepted market practice for U.S. dollar denominated floating rate securities at such time. For the avoidance of doubt, the calculation of Compounded SOFR will exclude the Benchmark Replacement Adjustment plus 513 basis points. (10) “Corresponding Tenor” with respect to a Benchmark Replacement means a tenor (including overnight) having approximately the same length (disregarding Business Day adjustment) as the applicable tenor for the then-current Benchmark. (11) “FRBNY” means the Federal Reserve Bank of New York. (12) “FRBNY’s Website” means the website of the FRBNY at xxxx://xxx.xxxxxxxxxx.xxx, or any successor source. (13) “Interpolated Benchmark” with respect to the Benchmark means the rate determined for the Corresponding Tenor by interpolating on a linear basis between: (1) the Benchmark for the longest period (for which the Benchmark is available) that is shorter than the Corresponding Tenor and (2) the Benchmark for the shortest period (for which the Benchmark is available) that is longer than the Corresponding Tenor. (14) “ISDA” means the International Swaps and Derivatives Association, Inc. or any successor thereto. (15) “ISDA Definitions” means the 2006 ISDA Definitions published by the ISDA or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time. (16) “ISDA Fallback Adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor. (17) “ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment. (18) “Reference Time” with respect to any determination of the Benchmark means (a) if the Benchmark is Three-Month Term SOFR, the time determined by the Calculation Agent after giving effect to the Three-Month Term SOFR Conventions, and (b) if the Benchmark is not Three-Month Term SOFR, the time determined by the Calculation Agent after giving effect to the Benchmark Replacement Conforming Changes. (19) “Relevant Governmental Body” means the Board of Governors of the Federal Reserve System (the “Federal Reserve”) and/or the FRBNY, or a committee officially endorsed or convened by the Federal Reserve and/or the FRBNY or any successor thereto. A-10

(20) “SOFR” means the daily secured overnight financing rate published by the FRBNY, as the administrator of the benchmark, (or a successor administrator) on the FRBNY’s Website (or such successor’s website). (21) “Term SOFR” means the forward-looking term rate for the applicable Corresponding Tenor based on SOFR that has been selected or recommended by the Relevant Governmental Body. (22) “Term SOFR Administrator” means any entity designated by the Relevant Governmental Body as the administrator of Term SOFR (or successor administrator). (23) “Three-Month Term SOFR” means the rate for Term SOFR for a tenor of three months that is published by the Term SOFR Administrator at the Reference Time for any Floating Rate Period, as determined by the Calculation Agent after giving effect to the Three-Month Term SOFR Conventions. All percentages used in or resulting from any calculation of Three-Month Term SOFR shall be rounded, if necessary, to the nearest one-hundred- thousandth of a percentage point, with 0.000005% rounded up to 0.00001%. (24) “Three-Month Term SOFR Conventions” means any determination, decision or election with respect to any technical, administrative or operational matter (including with respect to the manner and timing of the publication of Three-Month Term SOFR, or changes to the definition of “Floating Rate Period,” timing and frequency of determining Three-Month Term SOFR with respect to each Floating Rate Period and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Calculation Agent decides may be appropriate to reflect the use of Three-Month Term SOFR as the Benchmark in a manner substantially consistent with market practice (or, if the Calculation Agent decides that adoption of any portion of such market practice is not administratively feasible or if the Calculation Agent determines that no market practice for the use of Three-Month Term SOFR exists, in such other manner as the Calculation Agent determines is reasonably necessary). (25) “Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment. A-11

3. Subordination. (a) The indebtedness of the Company evidenced by this Subordinated Note, including the principal and interest on this Subordinated Note, shall be subordinate and junior in right of payment to the prior payment in full of all existing claims of creditors of the Company whether now outstanding or subsequently created, assumed, guaranteed or incurred (collectively, “Senior Indebtedness”), which shall consist of principal of (and premium, if any) and interest, if any, on: (i) all indebtedness and obligations of, or guaranteed or assumed by, the Company for money borrowed, whether or not evidenced by bonds, debentures, securities, notes or other similar instruments, and including, but not limited to, all obligations to the Company’s general creditors and secured creditors; (ii) any deferred obligations of the Company for the payment of the purchase price of property or assets acquired other than in the ordinary course of business; (iii) all obligations, contingent or otherwise, of the Company in respect of any letters of credit, bankers’ acceptances, security purchase facilities and similar direct credit substitutes; (iv) any capital lease obligations of the Company; (v) all obligations of the Company in respect of interest rate swap, cap or other agreements, interest rate future or option contracts, currency swap agreements, currency future or option contracts, commodity contracts and other similar arrangements or derivative products; (vi) any obligation of the Company to its general creditors, as defined for purposes of the capital adequacy regulations of the Federal Reserve applicable to the Company, as the same may be amended or modified from time to time; (vii) all obligations that are similar to those in clauses (i) through (vi) of other persons for the payment of which the Company is responsible or liable as obligor, guarantor or otherwise arising from an off-balance sheet guarantee; (viii) all obligations of the types referred to in clauses (i) through (vii) of other persons secured by a lien on any property or asset of the Company; and (ix) in the case of (i) through (viii) above, all amendments, renewals, extensions, modifications and refundings of such indebtedness and obligations; except “Senior Indebtedness” does not include (A) the Subordinated Notes, (B) any obligation that by its terms expressly is junior to, or ranks equally in right of payment with, the Subordinated Notes, or (C) any indebtedness between the Company and any of its subsidiaries or Affiliates. This Subordinated Note is not secured by any assets of the Company or any subsidiary or Affiliate of the Company. The term “Affiliate(s)” means, with respect to any Person (as such term is defined in the Purchase Agreement), such Person’s immediate family members, partners, members or parent and subsidiary corporations, and any other Person directly or indirectly controlling, controlled by, or under common control with said Person and their respective Affiliates. (b) In the event of any liquidation of the Company, holders of Senior Indebtedness of the Company shall be entitled to be paid in full with such interest as may be provided by law before any payment shall be made on account of principal of or interest on this Subordinated Note. Additionally, in the event of any insolvency, dissolution, assignment for the benefit of creditors or any liquidation or winding up of or relating to the Company, whether voluntary or involuntary, holders of Senior Indebtedness shall be entitled to be paid in full before any payment shall be made on account of the principal of or interest on the Subordinated Notes, including this Subordinated Note. In the event of any such proceeding, after payment in full of all sums owing with respect to the Senior Indebtedness, the registered holders of the Subordinated Notes from time to time (each a “Noteholder” and, collectively, the “Noteholders”), together with the holders of any obligations of the Company ranking on a parity with the Subordinated Notes, shall be entitled to be paid from the remaining assets of the Company the unpaid principal thereof, and the unpaid interest thereon A-12

before any payment or other distribution, whether in cash, property or otherwise, shall be made (i) with respect to any obligation that by its terms expressly is junior to in the right of payment to the Subordinated Notes, (ii) with respect to any indebtedness between the Company and any of its subsidiaries or Affiliates or (iii) on account of any capital stock. (c) If there shall have occurred and be continuing (i) a default in any payment with respect to any Senior Indebtedness or (ii) an event of default with respect to any Senior Indebtedness as a result of which the maturity thereof is accelerated, unless and until such payment default or event of default shall have been cured or waived or shall have ceased to exist, no payments shall be made by the Company with respect to the Subordinated Notes, notwithstanding the provisions of Section 18 hereof. The provisions of this paragraph shall not apply to any payment with respect to which the provisions of Section 3(b) above would be applicable. (d) Nothing herein shall act to prohibit, limit or impede the Company from issuing additional debt of the Company having the same rank as the Subordinated Notes or which may be junior or senior in rank to the Subordinated Notes. Each Noteholder, by its acceptance hereof, agrees to and shall be bound by the provisions of this Section 3. Each Noteholder, by its acceptance hereof, further acknowledges and agrees that the foregoing subordination provisions are, and are intended to be, an inducement and a consideration for each holder of any Senior Indebtedness, whether such Senior Indebtedness was created or acquired before or after the issuance of the Subordinated Notes, to acquire and continue to hold, or to continue to hold, such Senior Indebtedness, and such holder of Senior Indebtedness shall be deemed conclusively to have relied on such subordination provisions in acquiring and continuing to hold or in continuing to hold such Senior Indebtedness. 4. Redemption. (a) Redemption Prior to Fifth Anniversary. This Subordinated Note shall not be redeemable by the Company in whole or in part prior to the fifth anniversary of the Issue Date, except in the event of: (i) a Tier 2 Capital Event (as defined below); (ii) a Tax Event (as defined below); or (iii) an Investment Company Event (as defined below). Upon the occurrence of a Tier 2 Capital Event, a Tax Event or an Investment Company Event, subject to Section 4(f) below, the Company may redeem this Subordinated Note in whole, but not in part, at any time, upon giving not less than 10 calendar days’ notice to the Noteholders at an amount equal to 100% of the outstanding principal amount being redeemed plus accrued but unpaid interest, to but excluding the redemption date. “Tier 2 Capital Event” means the receipt by the Company of an opinion of counsel to the Company to the effect that there is a material risk that the Subordinated Note no longer qualifies to be eligible for treatment as “Tier 2” Capital (as defined by the Federal Reserve) (or its then equivalent) as a result of a change in law or regulation, or interpretation or application of law or regulation by any judicial, legislative or regulatory authority that becomes effective after the Issue Date. “Tax Event” means the receipt by the Company of an opinion of counsel to the Company that as a result of any amendment to, or change (including any final and adopted (or enacted) prospective change) in, the laws (or any regulations thereunder) of the United States or any political subdivision or taxing authority thereof or therein, or as a result of any official administrative pronouncement or judicial decision interpreting or applying such laws or regulations, there is a material risk that interest payable by the Company on the Subordinated Notes is not, or within 120 days after the receipt of such opinion will not be, deductible by the Company, A-13

in whole or in part, for United States federal income tax purposes. “Investment Company Event” means the receipt by the Company of an opinion of counsel to the Company to the effect that there is a material risk that the Company is or, within 120 days after the receipt of such opinion will be, required to register as an investment company pursuant to the Investment Company Act of 1940, as amended. (b) Redemption on or after Fifth Anniversary. On or after the fifth anniversary of the Issue Date, subject to Section 4(f) below, this Subordinated Note shall be redeemable at the option of and by the Company, in whole or in part at any time and from time to time upon any Interest Payment Date, at an amount equal to 100% of the outstanding principal amount being redeemed plus accrued but unpaid interest, to but excluding the redemption date, but in all cases in a principal amount with integral multiples of $1,000. In addition, on or after the fifth anniversary of the Issue Date, subject to Section 4(f), the Company may redeem all or a portion of the Subordinated Notes, at any time upon the occurrence of a Tier 2 Capital Event, Tax Event or an Investment Company Event. (c) Partial Redemption. If less than the then outstanding principal amount of this Subordinated Note is redeemed, (i) a new Subordinated Note shall be issued representing the unredeemed portion without charge to the holder thereof and (ii) such redemption shall be effected on a pro rata basis as to the Noteholders. For purposes of clarity, upon a partial redemption, a like percentage of the principal amount of every Subordinated Note held by every Noteholder shall be redeemed. (d) No Redemption at Option of Noteholder. This Subordinated Note is not subject to redemption at the option of the holder of this Subordinated Note. (e) Effectiveness of Redemption. If notice of redemption has been duly given and notwithstanding that this Subordinated Note has been called for redemption but has not yet been surrendered for cancellation, on and after the date fixed for redemption interest shall cease to accrue on the portion of this Subordinated Note called for redemption, this Subordinated Note shall no longer be deemed outstanding with respect to the portion called for redemption and all rights with respect to the portion of this Subordinated Note called for redemption shall forthwith on such date fixed for redemption cease and terminate unless the Company shall default in the payment of the redemption price, except only the right of the Noteholder to receive the amount payable on such redemption, without interest. (f) Regulatory Approvals. Any such redemption shall be subject to receipt of any and all required federal and state regulatory approvals, including, but not limited to, the consent of the Federal Reserve. In the case of any redemption of this Subordinated Note pursuant to paragraphs (a) or (b) of this Section 4, the Company will give the Noteholder notice of redemption, which notice shall indicate the aggregate principal amount of Subordinated Notes to be redeemed, not less than 30 nor more than 45 calendar days prior to the proposed redemption date. (g) Purchase and Resale of the Subordinated Notes. Subject to any required federal and state regulatory approvals and the provisions of this Subordinated Note, the Company shall have the right to purchase any of the Subordinated Notes at any time in the open market, private A-14

transactions or otherwise. If the Company purchases any Subordinated Notes, it may, in its discretion, hold, resell or cancel any of the purchased Subordinated Notes. 5. Events of Default; Acceleration. Each of the following events shall constitute an “Event of Default”: (a) the entry of a decree or order for relief in respect of the Company by a court having jurisdiction in the premises in an involuntary case or proceeding under any applicable bankruptcy, insolvency, or reorganization law, now or hereafter in effect of the United States or any political subdivision thereof, and such decree or order will have continued unstayed and in effect for a period of 90 consecutive calendar days; (b) the commencement by the Company of a voluntary case under any applicable bankruptcy, insolvency or reorganization law, now or hereafter in effect of the United States or any political subdivision thereof, or the consent by the Company to the entry of a decree or order for relief in an involuntary case or proceeding under any such law; (c) the Company (i) becomes insolvent or is unable to pay its debts as they mature, (ii) makes an assignment for the benefit of creditors, (iii) admits in writing its inability to pay its debts as they mature, or (iv) ceases to be a bank holding company or financial holding company under the Bank Holding Company Act of 1956, as amended; (d) the failure of the Company to pay any installment of interest on any of the Subordinated Notes as and when the same will become due and payable, and the continuation of such failure for a period of 30 calendar days; (e) the failure of the Company to pay all or any part of the principal of any of the Subordinated Notes as and when the same will become due and payable; (f) the liquidation of the Company (for the avoidance of doubt, “liquidation” does not include any merger, consolidation, sale of equity or assets or reorganization (exclusive of a reorganization in bankruptcy) of the Company or any of its subsidiaries); (g) the failure of the Company to perform any other covenant or agreement on the part of the Company contained in the Subordinated Notes, and the continuation of such failure for a period of 30 days after the date on which notice specifying such failure, stating that such notice is a “Notice of Default” hereunder and demanding that the Company remedy the same, will have been given, in the manner set forth in Section 22, to the Company by Noteholders of at least twenty- five percent (25%) in aggregate principal amount of the outstanding Subordinated Notes; or (h) the default by the Company under any bond, debenture, note or other evidence of indebtedness for money borrowed by the Company having an aggregate principal amount outstanding of at least $5,000,000, whether such indebtedness now exists or is created or incurred in the future, which default (i) constitutes a failure to pay any portion of the principal of such indebtedness when due and payable after the expiration of any applicable grace period or (ii) results in such indebtedness becoming due or being declared due and payable prior to the date on which it otherwise would have become due and payable without, in the case of clause (i), such indebtedness having been A-15

pay any dividends or distributions on, or redeem, purchase, acquire, or make a liquidation payment with respect to, any of the Company’s capital stock; (b) make any payment of principal of or interest or premium, if any, on or repay, repurchase or redeem any indebtedness of the Company that ranks equal with or junior to the Subordinated Notes; or (c) make any payments under any guarantee that ranks equal with or junior to the Subordinated Notes, other than (i) any dividends or distributions in shares of, or options, warrants or rights to subscribe for or purchase shares of, any class of the Company’s common stock; (ii) any declaration of a non-cash dividend in connection with the implementation of a shareholders’ rights plan, or the issuance of stock under any such plan in the future, or the redemption or repurchase of any such rights pursuant thereto; (iii) as a result of a reclassification of the Company’s capital stock or the exchange or conversion of one class or series of the Company’s capital stock for another class or series of the Company’s capital stock; (iv) the purchase of fractional interests in shares of the Company’s capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged; or (v) purchases of any class of the Company’s common stock related to or from any benefit plans for the Company’s directors, officers or employees or any of the Company’s dividend reinvestment plans. 7. Affirmative Covenants of the Company. (a) Notice of Certain Events. To the extent permitted by applicable statute, rule or regulation, the Company shall provide written notice to the Noteholder of the occurrence of any of the following events as soon as practicable, but in no event later than fifteen (15) Business Days following the Company becoming aware of the occurrence of such event: (i) The Bank (as defined in the Purchase Agreement) is no longer “adequately capitalized” as contemplated by applicable federal banking laws and regulations; or (ii) The Company, or any officer of the Company (in such capacity), becomes subject to any formal, written regulatory enforcement action (as defined by the applicable regulatory agency). (b) Payment of Principal and Interest. The Company covenants and agrees for the benefit of the Noteholders that it will duly and punctually pay the principal of, and interest on, this Subordinated Note, in accordance with the terms hereof. (c) Maintenance of Office. The Company will maintain an office or agency in the city of Seattle, Washington, where Subordinated Notes may be surrendered for registration of transfer or for exchange and where notices and demands to or upon the Company in respect of the Subordinated Notes may be served. The Company may also from time to time designate one or more other offices or agencies where the Subordinated Notes may be presented or surrendered for any or all such purposes and may from time to time rescind such designations; provided that no such designation or rescission will in any manner relieve the Company of its obligation to maintain an office or agency in city of Seattle, Washington. The Company will give prompt written notice to the Noteholders of any such designation or rescission and of any change in the location of any such other office or agency. A-17

(d) Corporate Existence. The Company will do or cause to be done all things necessary to preserve and keep in full force and effect: (i) the corporate existence of the Company; (ii) the existence (corporate or other) of each subsidiary; and (iii) the rights (charter and statutory), licenses and franchises of the Company and each of its subsidiaries; provided, however, that the Company will not be required to preserve the existence (corporate or other) of any of its subsidiaries or any such right, license or franchise of the Company or any of its subsidiaries if the Board of Directors of the Company determines that the preservation thereof is no longer desirable in the conduct of the business of the Company and its subsidiaries taken as a whole and that the loss thereof will not be disadvantageous in any material respect to the Noteholders; provided, however, that the Company may consummate a merger in which the Company is the surviving entity. (e) Maintenance of Properties. The Company will, and will cause each subsidiary to, cause all its properties used or useful in the conduct of its business to be maintained and kept in good condition, repair and working order and supplied with all necessary equipment and will cause to be made all necessary repairs, renewals, replacements, betterments and improvements thereof, all as in the judgment of the Company may be necessary so that the business carried on in connection therewith may be properly and advantageously conducted at all times; provided, however, that nothing in this Section will prevent the Company or any subsidiary from discontinuing the operation and maintenance of any of their respective properties if such discontinuance is, in the judgment of the Board of Directors of the Company or of any subsidiary, as the case may be, desirable in the conduct of its business. (f) Compliance Certificate. The Company will deliver to the Noteholders, within 120 days after the end of each fiscal year, an Officer’s Certificate covering the preceding fiscal year, stating whether or not, to the best of his or her knowledge, the Company is in default in the performance and observance of any of the terms, provisions and conditions of this Subordinated Note (without regard to notice requirements or periods of grace) and if the Company will be in default, specifying all such defaults and the nature and status thereof of which he or she may have knowledge. (g) Compliance with Laws. The Company shall comply with the requirements of all laws, regulations, orders and decrees applicable to it or its properties, except for such noncompliance that would not reasonably be expected to have a Material Adverse Effect (as such term is defined in the Purchase Agreement) on the Company and its Subsidiaries taken as a whole. (h) Taxes and Assessments. The Company shall punctually pay and discharge all material taxes, assessments, and other governmental charges or levies imposed upon it or upon its income or upon any of its properties; provided, that no such taxes, assessments or other governmental charges need be paid if they are being contested in good faith by the Company. 8. Negative Covenants of the Company. (a) Limitation on Dividends. The Company shall not declare or pay any dividend or make any distribution on capital stock or other equity securities of any kind of the Company if the Company is not “well capitalized” for regulatory capital purposes under Section 225.2(r) of A-18

Regulation Y (or any successor thereto immediately prior to the declaration of such dividend or distribution, except for dividends payable solely in shares of common stock of the Company. (b) Merger or Sale of Assets. The Company shall not merge with and into another entity (in which it is not the surviving entity), effect a Change in Bank Control (as defined below), or convey, transfer or lease all or substantially all of its properties and assets to any person, unless: (i) the continuing entity into which the Company is merged or the person which acquires by conveyance or transfer or which leases all or substantially all of the properties and assets of the Company shall be a corporation, association or other legal entity organized and existing under the laws of the United States of America, any State thereof or the District of Columbia and expressly assumes the due and punctual payment of the principal of and any premium and interest on the Subordinated Notes according to their terms, and the due and punctual performance of all covenants and conditions hereof on the part of the Company to be performed or observed; and (ii) immediately after giving effect to such transaction, no Event of Default, and no event which, after notice or lapse of time or both, would become an Event of Default, shall have happened and be continuing. “Change in Bank Control” means the sale, transfer, lease or conveyance by the Company, or an issuance of stock by the Bank, in either case resulting in ownership by the Company of less than 80% of the Bank. 9. Global Subordinated Notes. (a) The Company shall use its commercially reasonable efforts to provide that the Subordinated Notes owned by Noteholders that are Qualified Institutional Buyers shall be issued in the form of one or more Global Subordinated Notes (each a “Global Subordinated Note”) registered in the name of The Depository Trust Company or another organization registered as a clearing agency under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and designated as Depositary by the Company or any successor thereto (the “Depositary”) or a nominee thereof and delivered to such Depositary or a nominee thereof. (b) Notwithstanding any other provision herein, no Global Subordinated Note may be exchanged in whole or in part for Subordinated Notes registered, and no transfer of a Global Subordinated Note in whole or in part may be registered, in the name of any person other than the Depositary for such Global Subordinated Note or a nominee thereof unless (i) such Depositary advises the Company in writing that such Depositary is no longer willing or able to properly discharge its responsibilities as Depositary with respect to such Global Subordinated Note, and no qualified successor is appointed by the Company within 90 days of receipt by the Company of such notice, (ii) such Depositary ceases to be a clearing agency registered under the Exchange Act and no successor is appointed by the Company within 90 days after obtaining knowledge of such event, (iii) the Company elects to terminate the book-entry system through the Depositary or (iv) an Event of Default shall have occurred and be continuing. Upon the occurrence of any event specified in clause (i), (ii), (iii) or (iv) of this Section 9(b), the Company or its agent shall notify the Depositary and instruct the Depositary to notify all owners of beneficial interests in such Global A-19

Subordinated Note of the occurrence of such event and of the availability of Subordinated Notes to such owners of beneficial interests requesting the same. (c) If any Global Subordinated Note is to be exchanged for other Subordinated Notes or canceled in part, or if another Subordinated Note is to be exchanged in whole or in part for a beneficial interest in any Global Subordinated Note, then either (i) such Global Subordinated Note shall be so surrendered for exchange or cancellation as provided in this Section 9 or (ii) the principal amount thereof shall be reduced or increased by an amount equal to the portion thereof to be so exchanged or canceled, or equal to the principal amount of such other Subordinated Note to be so exchanged for a beneficial interest therein, as the case may be, by means of an appropriate adjustment made on the records of the Company or, if applicable, the Company’s registrar and transfer agent (“Registrar”), whereupon the Company or, if applicable, the Registrar, in accordance with the applicable rules and procedures of the Depositary (“Applicable Depositary Procedures”), shall instruct the Depositary or its authorized representative to make a corresponding adjustment to its records. Upon any such surrender or adjustment of a Global Subordinated Note by the Depositary, accompanied by registration instructions, the Company shall execute and deliver any Subordinated Notes issuable in exchange for such Global Subordinated Note (or any portion thereof) in accordance with the instructions of the Depositary. (d) Every Subordinated Note executed and delivered upon registration of transfer of, or in exchange for or in lieu of, a Global Subordinated Note or any portion thereof shall be executed and delivered in the form of, and shall be, a Global Subordinated Note, unless such Subordinated Note is registered in the name of a person other than the Depositary for such Global Subordinated Note or a nominee thereof. (e) The Depositary or its nominee, as the registered owner of a Global Subordinated Note, shall be the holder of such Global Subordinated Note for all purposes under this Subordinated Note, and owners of beneficial interests in a Global Subordinated Note shall hold such interests pursuant to Applicable Depositary Procedures. Accordingly, any such owner’s beneficial interest in a Global Subordinated Note shall be shown only on, and the transfer of such interest shall be effected only through, records maintained by the Depositary or its nominee or its Depositary participants. If applicable, the Registrar shall be entitled to deal with the Depositary for all purposes relating to a Global Subordinated Note (including the payment of principal and interest thereon and the giving of instructions or directions by owners of beneficial interests therein and the giving of notices) as the sole holder of the Subordinated Note and shall have no obligations to the owners of beneficial interests therein. The Registrar shall have no liability in respect of any transfers effected by the Depositary. (f) The rights of owners of beneficial interests in a Global Subordinated Note shall be exercised only through the Depositary and shall be limited to those established by law and agreements between such owners and the Depositary and/or its participants. (g) No holder of any beneficial interest in any Global Subordinated Note held on its behalf by a Depositary shall have any rights with respect to such Global Subordinated Note, and such Depositary may be treated by the Company and any agent of the Company as the owner of such Global Subordinated Note for all purposes whatsoever. Neither the Company nor any agent of the Company will have any responsibility or liability for any aspect of the records relating to or A-20

against principal due hereunder. The Noteholder acknowledges and agrees that the payment of all or any portion of the outstanding principal amount of this Subordinated Note and all interest hereon shall be pari passu in right of payment and in all other respects to the other Subordinated Notes. In the event that the Noteholder receives payments in excess of its pro rata share of the Company’s payments to the Noteholders of all of the Subordinated Notes, then the Noteholder shall hold in trust all such excess payments for the benefit of the holders of the other Subordinated Notes and shall pay such amounts held in trust to such other Noteholders upon demand by such Noteholders. 13. Form of Payment. Payments of principal and interest on this Subordinated Note shall be made in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts. 14. Registration of Transfer, Security Register. Except as otherwise provided herein, this Subordinated Note is transferable in whole or in part, and may be exchanged for a like aggregate principal amount of Subordinated Notes of other authorized denominations, by the Noteholder in person, or by its attorney duly authorized in writing, at the Payment Office or the office of the Registrar. The Company or its agent (the “Registrar”) shall maintain a register providing for the registration of the Subordinated Notes and any exchange or transfer thereof (the “Security Register”). Upon surrender or presentation of this Subordinated Note for exchange or registration of transfer, the Company or the Registrar shall execute and deliver in exchange therefor a Subordinated Note or Subordinated Notes of like aggregate principal amount, each in a minimum denomination of $250,000 or any amount in excess thereof which is an integral multiple of $1,000 (and, in the absence of an opinion of counsel satisfactory to the Company to the contrary, bearing the restrictive legend(s) set forth hereinabove) and that is or are registered in such name or names requested by the Noteholder. Any Subordinated Note presented or surrendered for registration of transfer or for exchange shall be duly endorsed and accompanied by a written instrument of transfer in such form as is attached hereto and incorporated herein, duly executed by the Noteholder or its attorney duly authorized in writing, with such tax identification number or other information for each person in whose name a Subordinated Note is to be issued, and accompanied by evidence of compliance with any restrictive legend(s) appearing on such Subordinated Note or Subordinated Notes as the Company may reasonably request to comply with applicable law. No exchange or registration of transfer of this Subordinated Note shall be made on or after (i) the fifteenth (15th) day immediately preceding the Stated Maturity or (ii) the due delivery of notice of redemption. 15. Priority. The Subordinated Notes rank pari passu among themselves and pari passu, in the event of any insolvency proceeding, dissolution, assignment for the benefit of creditors, reorganization, restructuring of debt, marshaling of assets and liabilities or similar proceeding or any liquidation or winding up of the Company with all other present or future unsecured subordinated debt obligations of the Company, except any unsecured subordinated debt that, pursuant to its express terms, is senior or subordinate in right of payment to the Subordinated Notes and all Senior Indebtedness. 16. Ownership. Prior to due presentment of this Subordinated Note for registration of transfer, the Company may treat the Noteholder in whose name this Subordinated Note is registered in the Security Register as the absolute owner of this Subordinated Note for receiving payments of principal and interest on this Subordinated Note and for all other purposes whatsoever, A-22

23. Further Issues. The Company may, without the consent of the Noteholders, create and issue additional notes having the same terms and conditions of the Subordinated Notes (except for the Issue Date) so that such further notes shall be consolidated and form a single series with the Subordinated Notes. 24. Governing Law; Interpretation. THIS SUBORDINATED NOTE WILL BE DEEMED TO BE A CONTRACT MADE UNDER THE LAWS OF THE STATE OF NEW YORK AND WILL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICT OF LAW PRINCIPLES THEREOF. THIS SUBORDINATED NOTE IS INTENDED TO MEET THE CRITERIA FOR QUALIFICATION OF THE OUTSTANDING PRINCIPAL AS TIER 2 CAPITAL UNDER THE REGULATORY GUIDELINES OF THE FEDERAL RESERVE, AND THE TERMS HEREOF SHALL BE INTERPRETED IN A MANNER TO SATISFY SUCH INTENT. A-25

IN WITNESS WHEREOF, the undersigned has caused this Subordinated Note to be duly executed and attested. SOUND FINANCIAL BANCORP, INC. By: Name: Xxxxx Xxx Xxxxxxx Title: President and Chief Executive Officer ATTEST: Name: Xxxxxx X. Xxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to Subordinated Note] A-26

ASSIGNMENT FORM To assign this Subordinated Note, fill in the form below: (I) or (we) assign and transfer this Subordinated Note to: (Print or type assignee’s name, address and zip code) (Insert assignee’s social security or tax I.D. No.) and irrevocably appoint _______________________ as agent to transfer this Subordinated Note on the books of the Company. The agent may substitute another to act for it. Date: Your signature: (Sign exactly as your name appears on the face of this Subordinated Note) Tax Identification No: Signature Guarantee: (Signatures must be guaranteed by an eligible guarantor institution (banks, stockbrokers, savings and loan associations and credit unions with membership in an approved signature guarantee medallion program), pursuant to Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). The undersigned certifies that it [is / is not] an Affiliate of the Company and that, to its knowledge, the proposed transferee [is / is not] an Affiliate of the Company. In connection with any transfer or exchange of this Subordinated Note occurring prior to the date that is one year after the later of the date of original issuance of this Subordinated Note and the last date, if any, on which this Subordinated Note was owned by the Company or any Affiliate of the Company, the undersigned confirms that this Subordinated Note is being: CHECK ONE BOX BELOW:  (1) acquired for the undersigned’s own account, without transfer;  (2) transferred to the Company;  (3) transferred in accordance and in compliance with Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”);  (4) transferred under an effective registration statement under the Securities Act; A-27

 (5) transferred in accordance with and in compliance with Regulation S under the Securities Act;  (6) transferred to an institutional “accredited investor” (as defined in Rule 501(a)(1), (2), (3) or (7) under the Securities Act);  (7) transferred to an “accredited investor” (as defined in Rule 501(a)(4) under the Securities Act), not referred to in item (6) that has been provided with the information designated under Section 4(d) of the Securities Act of 1933; or  (7) transferred in accordance with another available exemption from the registration requirements of the Securities Act. Unless one of the boxes is checked, the Company will refuse to register this Subordinated Note in the name of any person other than the registered holder thereof; provided, however, that if box (5), (6), (7) or (8) is checked, the Company may require, prior to registering any such transfer of this Subordinated Note, in its sole discretion, such legal opinions, certifications and other information as the Company may reasonably request to confirm that such transfer is being made pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act such as the exemption provided by Rule 144 of the Securities Act. Assignee’s Signature: Signature Guarantee: (Signatures must be guaranteed by an eligible guarantor institution (banks, stockbrokers, savings and loan associations and credit unions with membership in an approved signature guarantee medallion program), pursuant to Exchange Act Rule 17Ad-l5). TO BE COMPLETED BY PURCHASER IF BOX (1) OR (3) ABOVE IS CHECKED. The undersigned represents and warrants that it is purchasing this Subordinated Note for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act and is aware that the sale to it is being made in reliance on Rule 144A and acknowledges that it has received such information regarding the Company as the undersigned has requested pursuant to Rule 144A or has determined not to request such information and that it is aware that the transferor is relying upon the undersigned’s foregoing representations in order to claim the exemption from registration provided by Rule 144A. Date: Assignee’s Signature: A-28

EXHIBIT B OPINION OF COUNSEL 1. Each of the Company and the Bank is validly existing and is in good standing under the laws of its jurisdiction of organization. Each of the Company and the Bank (i) has all requisite corporate or similar power and authority to carry on its business as described in the Company Reports and (ii) is duly qualified to do business and is in good standing as a foreign corporation or bank in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to be so qualified or in good standing would not reasonably be expected to, individually or in the aggregate, have a Material Adverse Effect. 2. The Company has all requisite corporate power and authority to execute, deliver and perform its obligations under the Transaction Documents to which it is a party and to consummate the transactions contemplated by the Transaction Documents. 3. The Company is a registered bank holding company under the Bank Holding Company Act of 1956, as amended. 4. The deposit accounts of the Bank are insured by the Federal Deposit Insurance Corporation under the provisions of the Federal Deposit Insurance Act. 5. The Agreement has been duly and validly authorized, executed and delivered by the Company. The Agreement constitutes a legal, valid and binding obligation of the Company, enforceable against the Company in accordance with its terms, except that the enforcement thereof may be subject to (i) bankruptcy, insolvency, reorganization, receivership, moratorium, fraudulent conveyance, fraudulent transfer or other similar laws now or hereafter in effect relating to creditors’ rights generally and (ii) general principles of equity (whether applied by a court of law or equity) and the discretion of the court before which any proceeding therefor may be brought. 6. The execution and delivery by the Company of, and the performance by the Company on the date hereof of its agreements and obligations under, the Transaction Documents do not (i) to such counsel’s knowledge, violate any applicable provisions of the Maryland General Corporation Law, (ii) to such counsel’s knowledge, violate any court order or judgment of any agency or court of the State of Maryland having jurisdiction over the Company and known to such counsel or (iii) violate the Charter or Bylaws, each as currently in effect. 7. The Subordinated Notes have been duly and validly authorized by the Company and when duly executed issued and delivered to and paid for by the Purchasers in accordance with the terms of the Agreement, will constitute legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except that the enforcement thereof may be subject to (i) bankruptcy, insolvency, reorganization, receivership, moratorium, fraudulent conveyance, fraudulent transfer or other similar laws now or hereafter in effect relating to creditors’ rights generally and (ii) general principles of equity (whether applied by a court of law or equity) and the discretion of the court before which any proceeding therefor may be brought. B-1

8. Assuming the accuracy of the representations and warranties of each of the Purchasers and the Company set forth in the Agreement, the Subordinated Notes to be issued and sold by the Company to the Purchasers in accordance with the Agreement will be issued in a transaction exempt from the registration requirements of the Securities Act, it being understood that counsel expresses no opinion as to any subsequent transfer, sale or conveyance of the Subordinated Notes. B-2

EXHIBIT C RISK FACTORS Risk Factors Related to the Proposed Subordinated Notes (the “Notes”) An investment in the securities of the Company is subject to certain risks related to the type of security and risks inherent in the Company’s business. Before making an investment decision, you should carefully consider the risks and uncertainties described below together with the risk factors and other information included in the Company Reports and in other documents that the Company files with the SEC. Additional risks and uncertainties that management is not aware of or that management currently deems immaterial may also impair the Company’s business operations. If any of these risks actually occurs, the Company’s financial condition and results of operations could be materially and adversely affected. If this were to happen, the value of the Company’s securities could decline significantly, and you could lose all or part of your investment. The terms “Company,” “we,” “our” and “us” used herein refer to Sound Financial Bancorp, Inc. and its subsidiaries. The Notes will be unsecured and subordinated to any existing and future senior indebtedness. The Notes will be subordinated obligations of the Company. Accordingly, they will be junior in right of payment to any existing and all future senior indebtedness, and in certain events of insolvency, to other financial obligations. Our senior indebtedness includes all indebtedness, except indebtedness that is expressly subordinated to or ranked pari passu with the Notes, subject to certain exceptions. In addition, the Notes will be structurally subordinated to all existing and future indebtedness, liabilities and other obligations, including deposits, of our subsidiaries, including Sound Community Bank (the “Bank”). In addition, the Notes will not be secured by any of our assets. As a result, the Notes will be effectively subordinated to all of our secured indebtedness to the extent of the value of the assets securing such indebtedness. The Company will not be limited in the amount of senior indebtedness and other financial obligations or secured obligations that we or our subsidiaries may incur. As a result of the subordination provisions described above, holders of the Notes may not be fully repaid in the event of our bankruptcy, liquidation or reorganization. The Notes will not be insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”), any other governmental agency or any of our subsidiaries. The Notes will be structurally subordinated to the indebtedness and other liabilities of our subsidiaries, which means that creditors of our subsidiaries generally will be paid from those subsidiaries’ assets before holders of the Notes would have any claims to those assets. The Notes are not savings accounts, deposits or other obligations of the Bank or any of our non-bank subsidiaries and are not insured or guaranteed by the FDIC or any other governmental agency or public or private insurer. The Notes are obligations of the Company only and are neither obligations of, nor guaranteed by, any of our subsidiaries. The Notes are ineligible and may not be used as collateral for loans made by the Company or the Bank. The Notes will be structurally C-1

subordinated to all existing and future indebtedness and other liabilities of our subsidiaries, which means that creditors of our subsidiaries (including, in the case of the Bank, its depositors) generally will be paid from those subsidiaries’ assets before holders of the Notes would have any claims to those assets. Even if we become a creditor of any of our subsidiaries, our rights as a creditor would be subordinate to any security interest in the assets of that subsidiary and any debt of that subsidiary senior to that held by us, and our rights could otherwise be subordinated to the rights of other creditors and depositors of that subsidiary. Furthermore, none of our subsidiaries is under any obligation to make payments to us, and any payments to us would depend on the earnings or financial condition of our subsidiaries and various business considerations. Statutory, contractual or other restrictions also limit our subsidiaries’ ability to pay dividends or make distributions, loans or advances to us. For these reasons, we may not have access to any assets or cash flows of our subsidiaries to make interest and principal payments on the Notes. The Notes include limited covenants and do not restrict our ability to incur additional debt. The Notes do not contain any financial covenants that would require us to achieve or maintain any minimum financial results relating to our financial condition, liquidity or results of operations or meet or exceed certain financial ratios as a general matter or to incur additional indebtedness or obligations or to maintain any reserves. Moreover, the Notes do not contain any covenants prohibiting or limiting us or our subsidiaries from granting liens on assets to secure indebtedness or other obligations. The Notes do not contain any provision that would provide protection to the holders of the Notes against a material decline in our credit quality. In addition, the Notes do not limit the amount of additional indebtedness of the Company, the Bank or any of our other subsidiaries may incur or the amount of other obligations that the Company or the Bank may incur ranking senior or equal to the indebtedness evidenced by the Notes. The issuance or guarantee of any such securities or the incurrence of any such other liabilities may reduce the amount, if any, recoverable by holders of the Notes in the event of our insolvency, bankruptcy, liquidation, dissolution, winding up or similar proceeding, and may limit our ability to meet our obligations under the Notes. Payments on the Notes will depend on receipt of dividends and distributions from our subsidiaries. We are a bank holding company, and we conduct substantially all of our operations through subsidiaries, including the Bank. We depend on dividends, distributions and other payments from our subsidiaries to meet our obligations, including to fund payments on the Notes. Our primary source of funds to make payments of principal and interest on the Notes and to satisfy any other financial obligations are dividends from the Bank. Our ability to receive dividends from the Bank is contingent on a number of factors, including the Bank’s ability to meet applicable regulatory capital requirements, the Bank’s profitability and earnings, and the general strength of its balance sheet. Various federal and state laws and regulations limit the amount of dividends that the Bank may pay to the Company. Under Washington law, dividends on the Bank capital stock may not be paid in an aggregate amount greater than the aggregate retained earnings of the Bank without the approval of the Washington Department of Financial Institutions. In addition, the Bank may not C-2

declare or pay a cash dividend on its capital stock if the payment would cause its net worth to be reduced below the amount required for its liquidation account. Furthermore, the Federal Reserve and the FDIC have issued policy statements stating that insured banks and financial and bank holding companies generally should pay dividends only out of current operating earnings. Also, the Company’s right to participate in a distribution of assets upon a subsidiary’s liquidation or reorganization is subject to the prior claims of the subsidiary’s creditors. In the event the Bank is unable to pay dividends to us, we may not be able to service any debt we may incur, which could have a material adverse effect on our business, financial condition, results of operations and growth prospects. See the information under “How We Are Regulated —Limitations on Dividends and Stock Repurchases” in Item 1, “Business,” in our annual report on Form 10-K for the year ended December 31, 2019. In addition, state and federal banking regulators have broad authority to restrict the payment of dividends, including in circumstances where a bank under such regulator’s jurisdiction engages in (or is about to engage in) unsafe or unsound practices. Such regulators have the authority to require that the bank cease and desist from unsafe and unsound practices and to prevent a bank from paying a dividend if its financial condition is such that the regulator views the payment of a dividend to constitute an unsafe or unsound practice. For these reasons, we may not have access to any assets or cash flow of our subsidiaries to make principal or interest payments on the Notes. We may not be able to generate sufficient cash to service all of our debt, including the Notes. Our ability to make scheduled payments of principal and interest, or to satisfy our obligations in respect of our debt or to refinance our debt, will depend on the future performance of the Bank. Prevailing economic conditions (including interest rates), regulatory constraints, including, without limitation, limiting distributions to us from the Bank and required capital levels with respect to the Bank and financial, business and other factors, many of which are beyond our control, will also affect our ability to meet these needs. Our subsidiaries may not be able to generate sufficient cash flows from operations, or we may be unable to obtain future borrowings in an amount sufficient to enable us to pay our debt, or to fund our other liquidity needs. We may need to refinance all or a portion of our debt on or before maturity. We may not be able to refinance any of our debt when needed (including, without limitation, upon commencement of the floating rate period) on commercially reasonable terms or at all. Regulatory guidelines may restrict our ability to pay the principal of, and accrued and unpaid interest on, the Notes, regardless of whether we are the subject of an insolvency proceeding. As a bank holding company, our ability to pay the principal of, and interest on, the Notes is subject to the rules and guidelines of the Federal Reserve regarding capital adequacy. We intend to treat the Notes as “Tier 2 capital” under these rules and guidelines. The Federal Reserve guidelines generally require us to review the effects of the cash payment of Tier 2 capital C-3

instruments, such as the Notes, on our overall financial condition. The guidelines also require that we review our net income for the current and past four quarters, and the amounts we have paid on Tier 2 capital instruments for those periods, as well as our projected rate of earnings retention. Moreover, pursuant to federal law and Federal Reserve regulations, as a bank holding company, we are required to act as a source of financial and managerial strength to the Bank and commit resources to its support, including, without limitation, the guarantee of its capital plans if it is undercapitalized. Such support may be required at times when we may not otherwise be inclined or able to provide it. As a result of the foregoing, we may be unable to pay accrued interest on the Notes on one or more of the scheduled interest payment dates, or at any other time, or the principal of the Notes at the maturity of the Notes. If we were to be the subject of a bankruptcy proceeding under Chapter 11 of the U.S. Bankruptcy Code, then the bankruptcy trustee would be deemed to have assumed, and would be required to cure, immediately any deficit under any commitment we have to any of the federal banking agencies to maintain the capital of the Bank, and any other insured depository institution for which we have such a responsibility, and any claim for breach of such obligation would generally have priority over most other unsecured claims. The Notes are subject to limited rights of acceleration. Payment of principal of the Notes may be accelerated only in the case of certain bankruptcy-related events with respect to us. As a result, you have no right to accelerate the payment of principal of the Notes if we fail to pay principal of or interest on the Notes or if we fail in the performance of any of our other obligations under the Notes. Our regulators can, in the event we or the Bank become subject to an enforcement action, prohibit the Bank from paying dividends to us, and prevent our payment of interest or principal on the Notes and any dividends on our capital stock, but such limits will not permit acceleration of the Notes. An active trading market for the Notes may not develop. The Notes constitute a new issue of securities for which there is no existing trading market. We do not intend to apply for listing of the Notes on any securities exchange or for quotation of the Notes in any automated dealer quotation system. We cannot provide you with any assurance regarding whether a trading market for the Notes will develop, the ability of holders of the Notes to sell their Notes or the prices at which holders may be able to sell their Notes. You should also be aware that there may be a limited number of buyers if you decide to sell your Notes. This may affect the price you receive for your Notes or your ability to sell your Notes at all. Investors in the Notes may not be able to sell the Notes at all or may not be able to sell the Notes at prices that will provide them with a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk. In addition, the liquidity of the trading market in the Notes and the market price quoted for the Notes may be adversely affected by changes in the overall market for this type of security and by changes in our financial performance or prospects or in the prospects for companies in our industry generally. C-4

If a trading market for the Notes develops, changes in the debt markets, among others, could adversely affect your ability to liquidate your investment in the Notes and the market price of the Notes. Many factors could affect the trading market for, and the trading value of, the Notes. These factors include: the method of calculating the principal, premium, if any, interest or other amounts payable, if any, on the Notes; the time remaining to the maturity of the Notes; the ranking of the Notes; the redemption features of the Notes; the outstanding amount of subordinated notes with terms identical to the Notes offered hereby; the prevailing interest rates being paid by other companies similar to us; changes in U.S. interest rates; whether the ratings on the Notes or us provided by any rating agency have changed; our financial condition, financial performance and future prospects; the level, direction and volatility of market interest rates generally; general economic conditions of the capital markets in the United States; and geopolitical conditions and other financial, political, regulatory, and judicial events that affect the capital markets generally. The condition of the financial markets and prevailing interest rates have fluctuated significantly in the past and are likely to fluctuate in the future. Such fluctuations could adversely affect the trading market (if any) for, and the market price of, the Notes. Beginning on October 1, 2025, or at any time in the case of certain events, the Notes may be redeemed at our option, which limits the ability of holders of the Notes to accrue interest over the full stated term of the Notes. We may, at our option, redeem the Notes (i) in whole or in part, beginning on October 1, 2025 and on any interest payment date thereafter and (ii) in whole but not in part, at any time upon the occurrence of: • a “Tier 2 Capital Event,” which is defined in the Note to mean the receipt by us of an opinion of counsel to us to the effect that there is a material risk that the Note no longer qualifies to be eligible for treatment as “Tier 2” Capital (as defined by the Federal Reserve) (or its then equivalent) as a result of a change in law or regulation, or interpretation or application of law or regulation by any judicial, legislative or regulatory authority that becomes effective after the Issue Date; • a “Tax Event,” which is defined in the Note to mean the receipt by us of an opinion of independent tax counsel experienced in such matters to the effect that as a result of any amendment to, or change (including any final and adopted (or enacted) prospective change) in, the laws (or any regulations thereunder) of the United States or any political subdivision or taxing authority thereof or therein, or as a result of any official administrative pronouncement or judicial decision interpreting or applying such laws or regulations, there is a material risk that interest payable by us on the Notes is not, or within 120 days after the receipt of such opinion will not be, deductible by us, in whole or in part, for United States federal income tax purposes; or • an “Investment Company Event,” which is defined in the Note to mean receipt by us of an opinion from counsel experienced in such matters to the effect that there is a material risk that the Company is or, within 120 days after the receipt of such C-5

opinion will be, required to register as an investment company pursuant to the Investment Company Act of 1940, as amended, in each case at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to, but not including, the date of redemption. Any redemption of the Notes will be subject to prior approval of the Federal Reserve, to the extent such approval is then required. There can be no assurance that the Federal Reserve will approve any redemption of the Notes that we may propose. In addition, the redemption of the Notes may be subject to prior approval of the holders of our senior indebtedness, and there is no assurance that such holders of our senior indebtedness will approve any redemption of the Notes. Furthermore, you should not expect us to redeem any Notes when they first become redeemable or on any particular date thereafter. If we redeem the Notes for any reason, you will not have the opportunity to continue to accrue and be paid interest to the stated maturity date and you may not be able to reinvest the redemption proceeds you receive in a similar security or in securities bearing similar interest rates or yields. The amount of interest payable on the Notes will vary after October 1, 2025. During the fixed rate period, the Notes will bear interest at a fixed interest rate. Thereafter, the Notes will bear interest at a floating rate per annum equal to a floating interest rate (which is expected to be Three-Month Term SOFR) plus a spread, subject to certain provisions of the Notes. The per annum interest rate that is determined at the reference time for each interest period will apply to the entire quarterly interest period following such determination date even if the floating interest rate increases during that period. Floating rate notes bear additional significant risks not associated with fixed rate debt securities. These risks include fluctuation of the interest rates and the possibility that you will receive an amount of interest that is lower than expected. We have no control over a number of matters, including, without limitation, economic, financial, and political events, that are important in determining the existence, magnitude, and longevity of market volatility and other risks and their impact on the value of, or payments made on, the Notes. In recent years, interest rates have been volatile, and that volatility may be expected in the future. The level of the Benchmark rate (which is expected to be the Three-Month Term SOFR) may affect our decision to redeem the Notes. The Company is more likely to redeem the Notes on or after October 1, 2025 if the interest rate on them is higher than that which would be payable on one or more other forms of borrowing. If the Company redeems the Notes prior to their maturity date, holders may not be able to invest in other securities that yield as much interest as the Notes. Holders of the Notes will have no rights against the publishers of the Benchmark rate (which is expected to be the Three-Month Term SOFR). Holders of the Notes will have no rights against the publishers of the Benchmark rate, even though the amount they receive on each interest payment date after October 1, 2025 will depend upon the level of the Benchmark rate (which is expected to be the Three-Month Term SOFR). The C-6

publishers of the Benchmark rate are not in any way involved in the offering of the Notes and have no obligations relating to the Notes or the holders of the Notes. Our published credit ratings may not reflect all risks of an investment in the Notes. The published credit ratings of us or our indebtedness are an assessment by rating agencies of our ability to pay our debts when due. These ratings are not recommendations to purchase, hold or sell the Notes, inasmuch as the ratings do not comment as to market price or suitability for a particular investor, are limited in scope, and do not address all material risks relating to an investment in the Notes, but rather reflect only the view of each rating agency at the time the rating is issued. The published credit ratings assigned to the Notes may not reflect the potential impact of all risks related to structure and other factors on any trading market for, or trading value of, the Notes. Accordingly, you should consult your own financial and legal advisors as to the risks entailed by an investment in the Notes and the suitability of investing in the Notes in light of your particular circumstances. A downgrade in our credit ratings or the ratings of our subsidiaries could have a material adverse impact on us. Rating agencies continuously evaluate us and our subsidiaries, and their ratings of our long-term and short-term debt are based on a number of factors, including financial strength, as well as factors not entirely within our control, such as conditions affecting the financial services industry generally. In light of these reviews and the continued focus on the financial services industry generally, we and our subsidiaries may not be able to maintain our current credit ratings. Ratings downgrades by a rating agency could have a significant and immediate impact on our funding and liquidity through cash obligations, reduced funding capacity and collateral triggers. A reduction in our or our subsidiaries’ credit ratings could also increase our borrowing costs and limit access to the capital markets. Downgrades in the credit or financial strength ratings assigned to the counterparties with whom we transact could create the perception that our financial condition will be adversely impacted as a result of potential future defaults by such counterparties. Additionally, we could be adversely affected by a general, negative perception of financial institutions caused by the downgrade of other financial institutions. Accordingly, ratings downgrades for other financial institutions could affect the market price of our stock and could limit our access to or increase our cost of capital. The Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”). The Notes have not been registered with the SEC under the Securities Act. The Notes are being offered and sold in reliance upon an exemption from registration provided in Rule 506 of Regulation D promulgated under and Section 4(a)(2) of the Securities Act. Accordingly, the Notes may not be offered or sold absent registration with the SEC or a valid exemption under the Securities Act, and are subject to certain transfer restrictions set forth in the Notes. C-7

Investors should not rely on indicative or historical data concerning SOFR. The interest rate during the floating rate period will be determined using Three-Month Term SOFR (unless a Benchmark Transition Event and its related Benchmark Replacement Date occur with respect to Three-Month Term SOFR, in which case the rate of interest will be based on the next-available Benchmark Replacement, which is Compounded SOFR). In the following discussion of SOFR, when we refer to the Notes, we mean the Notes at any time during the floating rate period when the interest rate on the Notes is or will be determined based on SOFR, including Three-Month Term SOFR. SOFR is published by the Federal Reserve Bank of New York (“FRBNY”) and is intended to be a broad measure of the cost of borrowing cash overnight collateralized by U.S. Treasury securities. FRBNY reports that SOFR includes all trades in the Broad General Collateral Rate, plus bilateral U.S. Treasury repurchase agreement (“repo”) transactions cleared through the delivery-versus-payment service offered by the Fixed Income Clearing Corporation (the “FICC”), a subsidiary of DTC. SOFR is filtered by FRBNY to remove a portion of the foregoing transactions considered to be “specials.” According to FRBNY, “specials” are repos for specific-issue collateral which take place at cash-lending rates below those for general collateral repos because cash providers are willing to accept a lesser return on their cash in order to obtain a particular security. FRBNY reports that SOFR is calculated as a volume-weighted median of transaction-level tri-party repo data collected from The Bank of New York Mellon, which currently acts as the clearing bank for the tri-party repo market, as well as General Collateral Finance Repo transaction data and data on bilateral U.S. Treasury repo transactions cleared through the FICC’s delivery-versus-payment service. FRBNY states that it obtains information from DTCC Solutions LLC, an affiliate of DTC. FRBNY currently publishes SOFR daily on its website at xxxxx://xxxx.xxxxxxxxxx.xxx/xxxxxxx/xxxxxxxxx/xxxx. FRBNY states on its publication page for SOFR that use of SOFR is subject to important disclaimers, limitations and indemnification obligations, including that FRBNY may alter the methods of calculation, publication schedule, rate revision practices or availability of SOFR at any time without notice. The foregoing Internet website is an inactive textual reference only, meaning that the information contained on the website is not part of this document or incorporated by reference herein or therein. FRBNY started publishing SOFR in April of 2018. FRBNY has also started publishing historical indicative SOFRs dating back to 2014, although such historical indicative data inherently involves assumptions, estimates and approximations. Investors should not rely on such historical indicative data or on any historical changes or trends in SOFR as an indicator of the future performance of SOFR. Since the initial publication of SOFR, daily changes in the rate have, on occasion, been more volatile than daily changes in comparable benchmark or market rates, and SOFR over time may bear little or no relation to the historical actual or historical indicative data. In addition, the return on and value of the Notes may fluctuate more than floating rate securities that are linked to less volatile rates. C-8

Changes in SOFR could adversely affect holders of the Notes. Because SOFR is published by FRBNY based on data received from other sources, we have no control over its determination, calculation or publication. There is no assurance that SOFR will not be discontinued or fundamentally altered in a manner that is materially adverse to the interests of investors in the Notes. If the manner in which SOFR is calculated is changed, that change may result in a reduction in the amount of interest that accrues on the Notes during the floating rate period, which may adversely affect the trading prices of the Notes. Further, if the Benchmark rate on the Notes during the floating rate period on any determination date declines to zero or becomes negative, the Benchmark rate will be deemed to equal zero. In addition, once the Benchmark rate for the Notes for each interest period during the floating rate period is determined by the calculation agent on the determination date, interest on the Notes shall accrue at such Benchmark rate for the applicable interest period and will not be subject to change during such interest period. There is no assurance that changes in SOFR could not have a material adverse effect on the yield on, value of and market for the Notes. SOFR may be more volatile than other benchmark or market rates. Since the initial publication of SOFR, daily changes in the rate have, on occasion, been more volatile than daily changes in comparable benchmark or market rates, and SOFR over time may bear little or no relation to the historical actual or historical indicative data. In addition, the return on and value of the SOFR-linked Notes may fluctuate more than floating rate securities that are linked to less volatile rates. SOFR differs fundamentally from, and may not be a comparable substitute for, U.S. dollar LIBOR. In June 2017, the Alternative Reference Rates Committee (“ARRC”) convened by the Federal Reserve and FRBNY announced SOFR as its recommended alternative to the London interbank offered rate (“LIBOR”) for U.S. dollar obligations. However, because SOFR is a broad U.S. Treasury repo financing rate that represents overnight secured funding transactions, it differs fundamentally from LIBOR. For example, SOFR is a secured overnight rate, while LIBOR is an unsecured rate that represents interbank funding over different maturities. In addition, because SOFR is a transaction-based rate, it is backward-looking, whereas LIBOR is forward-looking. Because of these and other differences, there is no assurance that SOFR will perform in the same way as LIBOR would have performed at any time, and there is no guarantee that it is a comparable substitute for LIBOR. Any failure of SOFR to gain market acceptance could adversely affect holders of the Notes. SOFR may fail to gain market acceptance. SOFR was developed for use in certain U.S. dollar derivatives and other financial contracts as an alternative to LIBOR in part because it is considered to be a good representation of general funding conditions in the overnight U.S. Treasury repo market. However, as a rate based on transactions secured by U.S. Treasury securities, it does not measure bank-specific credit risk and, as a result, is less likely to correlate with the unsecured short-term funding costs of banks. This may mean that market participants would not consider SOFR to be a comparable substitute or successor for all of the purposes for C-9

which LIBOR historically has been used (including, without limitation, as a representation of the unsecured short-term funding costs of banks), which may, in turn, lessen its market acceptance. Any failure of SOFR to gain market acceptance could adversely affect the yield on, value of and market for the Notes. Any market for the SOFR-linked Notes may be illiquid or unpredictable. Since SOFR is a relatively new market index, SOFR-linked debt securities likely will have no established trading market when issued, and an established trading market for the SOFR-linked Notes may never develop or may not be very liquid. Market terms for securities that are linked to SOFR, such as the spread over the base rate reflected in the interest rate provisions, may evolve over time, and as a result, trading prices of the SOFR-linked Notes may be lower than those of later-issued securities that are linked to SOFR. Similarly, if SOFR does not prove to be widely used in securities that are similar or comparable to the SOFR-linked Notes, the trading price of the SOFR-linked Notes may be lower than those of securities that are linked to rates that are more widely used. Investors may not be able to sell the SOFR-linked Notes at all or may not be able to sell the SOFR-linked Notes at prices that will provide them with a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk. The manner of adoption or application of reference rates based on SOFR in the bond and equity markets may differ materially compared with the application and adoption of SOFR in other markets, such as the derivatives and loan markets. Investors should carefully consider how any potential inconsistencies between the adoption of reference rates based on SOFR across these markets may impact any hedging or other financial arrangements that they may put in place in connection with any acquisition, holding or disposal of the SOFR-linked Notes. The interest rate for the Notes during the applicable floating rate period may be determined based on a rate other than Three-Month Term SOFR. Under the terms of the Notes, the interest rate on the Notes for each interest period during the applicable floating rate period will be based on Three-Month Term SOFR, a forward-looking term rate for a tenor of three months that will be based on SOFR. Three-Month Term SOFR does not currently exist and is currently being developed under the sponsorship of the ARRC. There is no assurance that the development of Three-Month Term SOFR, or any other forward-looking term rate based on SOFR, will be completed. Uncertainty surrounding the development of forward-looking term rates based on SOFR could have a material adverse effect on the return on, value of and market for the Notes. If, at the commencement of the applicable floating rate period for the Notes, the Federal Reserve and/or FRBNY, or a committee officially endorsed or convened by the Federal Reserve and/or FRBNY or any successor thereto (the “Relevant Governmental Body”) has not selected or recommended a forward-looking term rate for a tenor of three months based on SOFR, the development of a forward-looking term rate for a tenor of three months based on SOFR that has been recommended or selected by the Relevant Governmental Body is not complete or we determine that the use of a forward-looking rate for a tenor of three months based on SOFR is not administratively feasible, then the next-available Benchmark Replacement under the benchmark transition provisions will be used to determine the interest rate on the Notes during the applicable floating rate period (unless a Benchmark Transition Event and its related Benchmark Replacement Date occur with respect to that next-available Benchmark Replacement). C-10

Under the terms of the Notes, we are expressly authorized to make determinations, decisions or elections with respect to technical, administrative or operational matters that we decide are appropriate to reflect the use of Three-Month Term SOFR as the interest rate basis for the Notes, which are defined in the terms of the Notes as “Three-Month Term SOFR Conventions.” For example, assuming that a form of Three-Month Term SOFR is developed, it is not currently known how or by whom rates for Three-Month Term SOFR will be published. Accordingly, we will need to determine and to instruct the calculation agent concerning the manner and timing for its determination of the applicable Three-Month Term SOFR during the applicable floating rate period. Our determination and implementation of any Three-Month Term SOFR Conventions could result in adverse consequences to the amount of interest that accrues on the Notes during the applicable floating rate period, which could adversely affect the return on, value of and market for the Notes. Any Benchmark Replacement may not be the economic equivalent of Three-Month Term SOFR. Under the benchmark transition provisions of the Notes, if the calculation agent determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Three-Month Term SOFR, then the floating interest rate on the Notes for each interest period during the floating rate period will be determined using the next-available Benchmark Replacement (which may include a related Benchmark Replacement Adjustment). However, the Benchmark Replacement may not be the economic equivalent of Three-Month Term SOFR. For example, Compounded SOFR, the first-available Benchmark Replacement, is the compounded average of the daily SOFR calculated in arrears, while Three-Month Term SOFR is intended to be a forward-looking rate with a tenor of three months. In addition, very limited market precedent exists for securities that use Compounded SOFR as the rate basis, and the method for calculating Compounded SOFR in those precedents varies. Further, the ISDA Fallback Rate, which is another Benchmark Replacement, has not yet been established and may change over time. The implementation of Benchmark Replacement Conforming Changes could adversely affect holders of the Notes. Under the benchmark transition provisions of the Notes, if Three-Month Term SOFR has been discontinued or if a particular Benchmark Replacement or Benchmark Replacement Adjustment cannot be determined, then the next-available Benchmark Replacement or Benchmark Replacement Adjustment will apply. These replacement rates and adjustments may be selected or formulated by: (i) the Relevant Governmental Body (such as the ARRC); (ii) the International Swaps and Derivatives Association, Inc.; or (iii) in certain circumstances, us. In addition, the benchmark transition provisions expressly authorize us to make certain changes, which are defined in the terms of the Notes as “Benchmark Replacement Conforming Changes,” with respect to, among other things, the determination of interest periods, and the timing and frequency of determining rates and making payments of interest. The application of a Benchmark Replacement and Benchmark Replacement Adjustment, and any implementation of Benchmark Replacement Conforming Changes, could result in adverse consequences to the amount of interest that accrues on the Notes during any interest period during the floating rate period, which could adversely affect the yield on, value of and market for the Notes. Further, there is no assurance that the characteristics of any Benchmark Replacement will be similar to the then-current Benchmark rate C-11

that it is replacing, or that any Benchmark Replacement will produce the economic equivalent of the then-current Benchmark rate that it is replacing. Also, since SOFR is a relatively new market index, SOFR-linked debt securities likely will have no established trading market when issued, and an established trading market may never develop or may not be very liquid. Market terms for debt securities indexed to SOFR, such as the spread over the index reflected in interest rate provisions, may evolve over time, and trading prices of the Notes may be lower than those of later-issued SOFR-linked debt securities as a result. Similarly, if SOFR does not prove to be widely used in securities similar to the Notes, the trading price of the Notes may be lower than those of debt securities linked to such rates that are more widely used. Debt securities indexed to SOFR (as the Notes will be) may not be able to be sold at all or may not be able to be sold at prices that will provide a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk. We or an affiliate of ours will or could have authority to make determinations and elections that could affect the return on, value of and market for the Notes. Under the terms of the Notes, we may make certain determinations, decisions and elections with respect to the Benchmark rate on the Notes during the floating rate period, including, without limitation, any determination, decision or election required to be made by the calculation agent that the calculation agent fails to make. We will make any such determination, decision or election in our sole discretion, and any such determination, decision or election that we make could affect the amount of interest that accrues on the Notes during any interest period in the floating rate period. If the calculation agent fails, when required, to make a determination that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred, or fails, when required, to determine the Benchmark Replacement and Benchmark Replacement Adjustment, then we will make those determinations in our sole discretion. Furthermore, we or an affiliate of ours may assume the duties of calculation agent. We will act as the initial calculation agent and we cannot assure you that we will appoint an independent third-party calculation agent at any time. Any exercise of discretion by us under the terms of the Notes, including, without limitation, any discretion exercised by us or by an affiliate acting as calculation agent, could present a conflict of interest. In making the required determinations, decisions and elections, we or an affiliate of ours acting as calculation agent may have economic interests that are adverse to the interest of the holders of the Notes, and those determinations, decisions or elections could have a material adverse effect on the yield on, value of and market for the Notes. All determinations, decisions or elections by us, or by us or an affiliate acting as calculation agent, under the terms of the Notes will be conclusive and binding absent manifest error. C-12

SCHEDULE A DIRECT AND INDIRECT SUBSIDIARIES 1. Sound Community Bank (100% owned by the Company) 2. Sound Community Insurance Agency, Inc. (100% owned by Sound Community Bank)

APPENDIX A Required Waiver Disclosure Xxxxxx, Xxxxxxxx & Company, Incorporated (“Stifel”) is a broker dealer affiliate of KBW. On December 6, 2016, a final judgment (the “Judgment”) was entered against Stifel by the United States District Court for the Eastern District of Wisconsin (Civil Action No. 2:11-cv-00755) resolving a civil lawsuit filed by the U.S. Securities & Exchange Commission (the “SEC”) in 2011 involving violations of several antifraud provisions of the federal securities laws in connection with the sale of synthetic collateralized debt obligations to five Wisconsin school districts in 2006. As a result of the Judgment: (i) Stifel is required to cease and desist from committing or causing any violations and any future violations of Section 17(a)(2) and 17(a)(3) of the Securities Act; and (ii) Stifel and a former employee were jointly liable to pay disgorgement and prejudgment interest of $2.5 million. Stifel was also required to pay a civil penalty of $22.0 million, of which disgorgement and civil penalty Stifel was required to pay $12.5 million to the school districts involved in this matter. Simultaneously with the entry of the Judgment, the SEC issued an Order granting Stifel a waiver from, among other things, the application of the disqualification provisions of Rule 506(d)(1)(iv) of Regulation D under the Securities Act. A copy of the Judgment is available on the SEC’s website at: xxxxx://xxx.xxx.xxx/xxxxxxxxxx/xxxxxxxxxxx/0000/xx00000-xxxxx-xxxxxxxx.xxx.

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Execution Copy SUBORDINATED NOTE PURCHASE AGREEMENT This SUBORDINATED NOTE PURCHASE AGREEMENT (this “Agreement”) is dated as of September 18, 2020, and is made by and among Sound Financial Bancorp, Inc., a Maryland corporation (the “Company”), and the...

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Execution Copy SUBORDINATED NOTE PURCHASE AGREEMENT This SUBORDINATED NOTE PURCHASE AGREEMENT (this “Agreement”) is dated as of September 18, 2020, and is made by and among Sound Financial Bancorp, Inc., a Maryland corporation (the “Company”), and the...

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