22687449.2 4822-7795-8138.v1 SECOND SUPPLEMENTAL INDENTURE THIS SECOND SUPPLEMENTAL INDENTURE dated as of September 17, 2021 is by and among Wilmington Trust Company, a Delaware trust company, as Trustee (herein, together with its successors in...

22687449.2 4822-7795-8138.v1 SECOND SUPPLEMENTAL INDENTURE THIS SECOND SUPPLEMENTAL INDENTURE dated as of September 17, 2021 is by and among Wilmington Trust Company, a Delaware trust company, as Trustee (herein, together with its successors in interest, the “Trustee”), Peoples Bancorp, Inc., an Ohio corporation (the “Successor Company”), and Premier Financial Bancorp, Inc., a Kentucky corporation (the “Company”), under the Indenture referred to below. NOW, THEREFORE, in consideration of the premises and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged by the parties hereto, the Trustee, the Company and the Successor Company hereby agree as follows: PRELIMINARY STATEMENTS The Trustee and the First National Bankshares Corporation (“First National”) were parties to that certain Indenture dated as of February 26, 2004 (the “Indenture”), pursuant to which the First National issued U.S. $6,186,000 of its Floating Rate Junior Subordinated Debt Securities due 2034. On January 15, 2016, the Trustee, First National and the Company entered into a First Supplemental Indenture, pursuant to which the Company assumed the obligations of First National under the Indenture. As permitted by the terms of the Indenture, simultaneously with the effectiveness of this Second Supplemental Indenture, the Company will merge with and into the Successor Company (referred to herein for purposes of Article XI of the Indenture as the “Merger”) with the Successor Company as the surviving corporation. The parties hereto are entering into this Second Supplemental Indenture pursuant to, and in accordance with, Articles IX and XI of the Indenture. SECTION 1. Definitions. All capitalized terms used herein that are defined in the Indenture, either directly or by reference therein, shall have the respective meanings assigned them in the Indenture except as otherwise provided herein or unless the context otherwise requires. SECTION 2. Interpretation. (a) In this Second Supplemental Indenture, unless a clear contrary intention appears: (i) the singular number includes the plural number and vice versa; (ii) reference to any gender includes the other gender; (iii) the words “herein,” “hereof” and “hereunder” and other words of similar import refer to this Second Supplemental Indenture as a whole and not to any particular Section or other subdivision;

22687449.2 4822-7795-8138.v1 2 (iv) reference to any Person includes such Person’s successors and assigns but, if applicable, only if such successors and assigns are permitted by this Second Supplemental Indenture, the First Supplemental Indenture or the Indenture, and reference to a Person in a particular capacity excludes such Person in any other capacity or individually provided that nothing in this clause (iv) is intended to authorize any assignment not otherwise permitted by this Second Supplemental Indenture or the Indenture; (v) reference to any agreement, document or instrument means such agreement, document or instrument as amended, supplemented or modified and in effect from time to time in accordance with the terms thereof and, if applicable, the terms hereof, as well as any substitution or replacement therefor and reference to any note includes modifications thereof and any note issued in extension or renewal thereof or in substitution or replacement therefor; (vi) reference to any Section means such Section of this Second Supplemental Indenture; and (vii) the word “including” (and with correlative meaning “include”) means including without limiting the generality of any description preceding such term. (b) No provision in this Second Supplemental Indenture shall be interpreted or construed against any Person because that Person or its legal representative drafted such provision. SECTION 3. Assumption of Obligations. (a) Pursuant to, and in compliance and accordance with, Section 11.01 and Section 11.02 of the Indenture, the Successor Company hereby expressly assumes the due and punctual payment of the principal of and premium, if any, and interest on all of the Debt Securities in accordance with their terms, according to their tenor, and the due and punctual performance and observance of all of the covenants and conditions of the Indenture to be kept, performed, or observed by the Company under the Indenture. (b) Pursuant to, and in compliance and accordance with, Section 11.02 of the Indenture, the Successor Company succeeds to and is substituted for the Company, with the same effect as if the Successor Company had originally been named in the Indenture as the Company. (c) The Successor Company also succeeds to and is substituted for the Company with the same effect as if the Successor Company had originally

22687449.2 4822-7795-8138.v1 3 been named in (i) the Amended and Restated Declaration of Trust of the Trust, dated as of February 26, 2004 (the “Declaration of Trust”), as Sponsor (as defined in the Declaration of Trust) and (ii) the Guarantee Agreement, dated as of February 26, 2004 (the “Guarantee”), as Guarantor (as defined in the Guarantee). SECTION 4. Representations and Warranties. The Successor Company represents and warrants that (a) it has all necessary power and authority to execute and deliver this Second Supplemental Indenture and to perform the Indenture, (b) that it is the successor of the Company pursuant to the Merger effected in accordance with applicable law, (c) that it is a corporation organized and existing under the laws of the State of Ohio, (d) that both immediately before and after giving effect to the Merger and this Second Supplemental Indenture, no Default or Event of Default, and no event which, after notice or lapse of time or both, would become an Event of Default, has occurred and is continuing and (e) that this Second Supplemental Indenture is executed and delivered pursuant to Section 9.01(a) and Article XI of the Indenture and does not require the consent of the Securityholders. SECTION 5. Conditions of Effectiveness. This Second Supplemental Indenture shall become effective simultaneously with the effectiveness of the Merger, provided, however, that: (a) the Trustee shall have executed a counterpart of this Second Supplemental Indenture and shall have received one or more counterparts of this Second Supplemental Indenture executed by the Successor Company and the Company; (b) the Trustee shall have received an Officers’ Certificate stating that (i) this Second Supplemental Indenture complies with the requirements of Article IX of the Indenture; and (ii) in the opinion of the signers, all conditions precedent, if any, provided for in the Indenture relating to the Merger and this Second Supplemental Indenture have been complied with; (c) the Trustee shall have received an Opinion of Counsel to the effect that (i) all conditions precedent provided for in the Indenture relating to the Merger and this Second Supplemental Indenture have been complied with; (ii) this Second Supplemental Indenture complies with the requirements of Article IX of the Indenture and is authorized or permitted by, and conforms to, the terms of Article IX of the Indenture; (iii) it is proper for the Trustee, under the provisions of Article IX of the Indenture, to join in the execution of this Second Supplemental Indenture; and (iv) the Merger and the assumption by the Successor Company under this Second Supplemental Indenture comply with the provisions of Article XI of the Indenture; and (d) the Successor Company and the Company shall have duly executed and filed with the Secretaries of State of Commonwealth of Kentucky and the State of Ohio Articles of Merger in connection with the Merger.

22687449.2 4822-7795-8138.v1 4 SECTION 6. Reference to the Indenture. (a) Upon the effectiveness of this Second Supplemental Indenture, each reference in the Indenture to “this Indenture,” “hereunder,” “herein” or words of like import shall mean and be a reference to the Indenture, as affected, amended and supplemented hereby. (b) Upon the effectiveness of this Second Supplemental Indenture, each reference in the Debt Securities to the Indenture including each term defined by reference to the Indenture shall mean and be a reference to the Indenture or such term, as the case may be, as affected, amended and supplemented hereby. (c) The Indenture, as amended and supplemented hereby shall remain in full force and effect and is hereby ratified and confirmed. SECTION 7. Execution in Counterparts. This Second Supplemental Indenture 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 when taken together shall constitute but one and the same instrument. SECTION 8. Governing Law; Binding Effect. This Second Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York and shall be binding upon the parties hereto and their respective successors and assigns. SECTION 9. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Second Supplemental Indenture or the due execution thereof by the Company or the Successor Company. The recitals of fact contained herein shall be taken as the statements solely of the Company or the Successor Company, and the Trustee assumes no responsibility for the correctness thereof. [Signatures on following page]