Contract

Execution Version 119645946 COLLATERAL AGREEMENT (Second Lien) Dated as of July 26, 2024, among SUMMIT MIDSTREAM PARTNERS, LP, as a Pledgor, SUMMIT MIDSTREAM HOLDINGS, LLC, as a Pledgor and a Grantor, each SUBSIDIARY GUARANTOR identified herein each in the capacity or capacities set forth herein, and REGIONS BANK, as Collateral Agent Exhibit 10.5

iii Schedules Schedule I Pledged Collateral Schedule II Intellectual Property Schedule III Commercial Tort Claims Schedule IV Closing Date Gathering Station Real Property Schedule V Closing Date Pipeline Systems Real Property Schedule VI Deposit Accounts, Securities Accounts and Commodity Accounts Exhibits Exhibit I Form of Supplement to the Collateral Agreement

1 COLLATERAL AGREEMENT (Second Lien) This COLLATERAL AGREEMENT (Second Lien), dated as of July 26, 2024 (as amended, restated, supplemented or otherwise modified from time to time, this “Agreement”), is by and among SUMMIT MIDSTREAM HOLDINGS, LLC, a Delaware limited liability company (the “Issuer”), SUMMIT MIDSTREAM PARTNERS, LP, a Delaware limited partnership (the “Parent”), each Subsidiary listed on the signature pages hereof as a “Pledgor” or “Grantor”, each Subsidiary that shall, at any time after the date hereof, become a Pledgor or Grantor pursuant to Section 6.15 hereof, and REGIONS BANK (“Regions”), as collateral agent (in such capacity, together with its successors and permitted assigns in such capacity, the “Collateral Agent”) for the benefit of the Secured Parties. WHEREAS, the Issuer has entered into that certain Indenture, among the Issuer, the Parent, the Subsidiary Guarantors, and Regions, as trustee (in such capacity, the “Trustee”) and the Collateral Agent, dated as of July 26, 2024, (as so amended and restated and otherwise amended, supplemented or otherwise modified from time to time, the “Indenture”); WHEREAS, this Agreement is given by each Grantor and Pledgor in favor of the Collateral Agent for the ratable benefit of the Secured Parties to secure the payment and performance in full when due of the Secured Obligations; and WHEREAS, it is in the best interests of the Parent to execute this Agreement inasmuch as the Parent will derive substantial direct and indirect benefits from the execution, delivery and performance of its obligations under the Indenture and other Note Documents and is, therefore, willing to enter into this Agreement. NOW, THEREFORE, in consideration of the premises, the terms and conditions contained herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: ARTICLE 1. DEFINITIONS Section 1.01 Interpretation. (a) Capitalized terms used in this Agreement and not otherwise defined herein have the respective meanings assigned thereto in the Indenture or the Intercreditor Agreement, as applicable. All terms defined in the New York UCC (as defined herein) and not defined in this Agreement have the meanings specified therein (and if defined in more than one article of the New York UCC, shall have the meaning given in Article 8 or 9 thereof). (b) The rules of construction specified in Section 1.04 of the Indenture are incorporated herein mutatis mutandis. Section 1.02 Other Defined Terms. As used in this Agreement, the following terms have the meanings specified below: “Agreement” has the meaning assigned to such term in the introductory paragraph hereto. “Applicable Law” means all laws, rules, regulations and governmental guidelines applicable to the Person or matter in question, including statutory law, common law and equitable principles, as well as

2 provisions of constitutions, treaties, statutes, rules, regulations, orders and decrees of Governmental Authorities. “Article 9 Collateral” has the meaning assigned to such term in Section 3.01. “Bankruptcy Code” means Title 11 of the United States Code. “Building” has the meaning assigned to such term in the applicable Flood Law. “Claiming Obligor” has the meaning assigned to such term in Section 5.02. “Closing Date Gathering Station Real Property” means the Real Property listed on Schedule IV on the date hereof. “Closing Date Pipeline Systems Real Property” means the Real Property listed on Schedule V on the date hereof. “Code” means the Internal Revenue Code of 1986, as amended. “Collateral” means Article 9 Collateral and Pledged Collateral. “Collateral Agent” has the meaning assigned to such term in the introductory paragraph hereto. “Compression Units” means completed Compressor Packages of the Issuer or any Subsidiary Guarantor held by such Person, for use by such Person in providing compression services to its customers in the ordinary course of business, as evidenced by such Compressor Packages either then being or previously having been used by such Person in providing compression services under a service contract with a customer or designated by such Person for use under an executory contract for services with a customer. “Compressor Packages” means natural gas compression Equipment generally consisting of an engineered package of major serial numbered components including an engine, compressor, compressor cylinders, natural gas and engine jacket cooler, control devices and ancillary piping mounted on a metal skid. “Contributing Obligor” has the meaning assigned to such term in Section 5.02. “Copyrights” means all of the following: (a) all copyright rights in any work subject to the copyright laws of the United States or any other country or group of countries, whether as author, assignee, transferee or otherwise including but not limited to copyrights in software and all rights in and to databases, all designs (including but not limited to industrial designs, Protected Designs within the meaning of 17 U.S.C. 1301 et seq. and European Community designs), and all Mask Works (as defined under 17 U.S.C. 901 of the U.S. Copyright Act), whether registered or unregistered, (b) all registrations and applications for registration of any such copyright in the United States or any other country or group of countries, including registrations, supplemental registrations and pending applications for registration in the United States Copyright Office listed on Schedule II and (c) the right to sue or otherwise recover for any past, present and future infringement or other violation of any of the foregoing. “Domestic Subsidiary” means any Subsidiary that is not a Foreign Subsidiary.

3 “Dividends” means cash dividends and cash distributions with respect to any Pledged Stock made in the ordinary course of business and not as a liquidating dividend. “Double E Joint Venture” means Double E Pipeline, LLC, a Delaware limited liability company. “Eddy County” means Eddy County, New Mexico. “Excluded Accounts” means (a) Deposit Accounts and Securities Accounts holding exclusively cash, cash equivalents or other assets comprised solely of (i) funds used for payroll and payroll taxes and other employee benefit payments to or for the benefit of any Issuer’s or Guarantor’s employees in the current period (which may be monthly or quarterly, as applicable), (ii) taxes required to be collected, remitted, reserved or withheld in the current period (which may be monthly or quarterly, as applicable) (including, without limitation, federal and state withholding taxes (including the employer’s share thereof)) and (iii) any other funds which any Issuer or Guarantor holds in trust or as an escrow or fiduciary for another person (which is not an Issuer, Guarantor or a Restricted Subsidiary), (b) “zero balance” Deposit Accounts, (c) other Deposit Accounts and Securities Accounts to the extent that the aggregate balance in all such Deposit Accounts and Securities Accounts does not exceed $1,000,000 at any time on a combined basis for all such accounts and (d) prior to Discharge of First Lien Obligations, any other Deposit Account, Securities Account or Commodity Account that is excluded from constituting a perfected Lien in favor of any First Lien Collateral Agent. “Excluded Assets” means (a) all real property of the Issuer or any Guarantor (whether leased or fee-owned) other than any Gathering Station Real Property acquired (whether acquired in a single transaction or in a series of transactions) or owned by the Issuer or any Subsidiary Guarantor having a net book value (including the net book value of improvements owned by the Issuer or any Subsidiary Guarantor and located thereon or thereunder) on the date of determination exceeding $15,000,000 (provided that, notwithstanding the foregoing, the Issuer shall cause not less than a substantial majority as determined by the Issuer and, prior to the Discharge of First Lien Obligations, the Initial First Lien Representative each acting reasonably and in good faith) of the value (including the net book value of improvements owned by the Issuer or any Guarantor and located thereon or thereunder) of the Gathering Station Real Property and the Pipeline Systems Real Property as of the date hereof and, thereafter, as of December 31 of each calendar year, to be subject to the Lien of a Mortgage), (b) Equity Interests in any Person (other than (i) the Issuer, any Subsidiary Guarantor or any Wholly Owned Subsidiary to the extent owned by the Issuer or any Subsidiary Guarantor and (ii) the Double E Joint Venture, to the extent owned by the Issuer or any Guarantor) to the extent not permitted to be pledged by the terms of such Person’s constitutional or joint venture documents but only so long as such prohibition or consent requirement was not created in contemplation or anticipation of circumventing the Issuer’s or any Guarantor’s obligations under the Note Documents (and, to the extent any such prohibition or limitation is removed or the applicable Person has obtained any required consents to eliminate or waive any such restrictions, such Equity Interests shall cease to be Excluded Assets), (c) Equity Interests constituting an amount greater than 65% of the voting Equity Interests of any Foreign Subsidiary or any Domestic Subsidiary substantially all of which Subsidiary’s assets consist of the Equity Interest in “controlled foreign corporations” under Section 957 of the Code, (d) Equity Interests or other assets that are held directly by a Foreign Subsidiary, (e) any “intent to use” applications for trademark or service mark registrations filed pursuant to Section 1(b) of the Xxxxxx Act, 15 U.S.C. §1051 (the “Xxxxxx Act”), unless and until an “Amendment to Allege Use” or a “Statement of Use” under Section 1(c) or Section 1(d) of the Xxxxxx Act has been filed, solely to the extent that such a grant of a security interest therein prior to such filing would impair the validity or enforceability of any registration that issues from such “intent to use” application, (f) any Building or Manufactured (Mobile) Home (each as defined in applicable flood insurance laws), (g) assets where the cost of obtaining a security interest therein or perfection thereof exceeds the practical benefit to the holders afforded thereby as

4 reasonably determined by any First Lien Representative, (h) any assets of a Person, the acquisition of which Person was financed from a subsidy or payments, the terms of which prohibit any assets acquired with such subsidy or payment being used as Collateral but only to the extent such financing is permitted by the Note Documents, (i) any lease, license, contract or agreement to which the Issuer or any Guarantor is a party, or any of the Issuer’s or such Guarantor’s rights or interest thereunder, if and to the extent that a security interest is prohibited by or in violation of a term, provision or condition of any such lease, license, contract or agreement, in each case solely to the extent that the Issuer or applicable Guarantor has previously used commercially reasonable efforts to remove such prohibition or limitation or to obtain any required consents to eliminate or have waived any such prohibition or limitation (unless such term, provision or condition would be rendered ineffective with respect to the creation of the security interest hereunder pursuant to Sections 9-406, 9-407, 9-408 or 9-409 of the UCC (or any successor provision or provisions) of any relevant jurisdiction or any other applicable law (including the Bankruptcy Code) or principles of equity); provided, that this clause (i) shall not prohibit the grant of a Lien at such time as the contractual prohibition shall no longer be applicable and, to the extent severable, which Lien shall attach immediately to any portion of such lease, license, contract or agreement not subject to the prohibitions specified above; and provided, further, that the provisions hereof shall not exclude any Proceeds (as defined in the UCC) of any such lease, license, contract or agreement, (j) any asset of the Issuer or any Guarantor, if and to the extent that a security interest therein would result in the contravention of applicable law, unless such applicable law would be rendered ineffective with respect to the creation of the security interest hereunder pursuant to Sections 9- 406, 9-407, 9-408 or 9-409 of the UCC (or any successor provision or provisions); provided, that this clause (j) shall not prohibit the grant of a Lien at such time as the legal prohibition shall no longer be applicable and to the extent severable (which Lien shall attach immediately to any portion not subject to the prohibitions specified above), (k) any asset of the Issuer or any Guarantor, if and to the extent that a security interest therein would result in a breach of a Material Contract (as defined in the ABL Facility) existing on the Issue Date and binding on the Issuer or such Guarantor solely to the extent that the Issuer or such Guarantor has previously used commercially reasonable efforts to amend, restate, supplement or otherwise modify the terms of such Material Contract to avoid such breach or to obtain a consent to, or waive, any such breach and (l) prior to the Discharge of First Lien Obligations, any other assets or property not subject to any Lien securing any First Lien Obligations. “Federal Securities Laws” has the meaning assigned to such term in Section 4.04. “Flood Laws” means collectively, the National Flood Insurance Act of 1968 as now or hereafter in effect or any successor statute thereto, the Flood Disaster Protection Act of 1973 as now or hereafter in effect or any successor statute thereto, the National Flood Insurance Reform Act of 1994 (amending 42 USC 4001, et seq.), as the same may be amended or recodified from time to time, the Flood Insurance Reform Act of 2004, the Xxxxxxx-Xxxxxx Flood Insurance Reform Act of 2012, related laws and any regulations promulgated thereunder. “Foreign Subsidiary” means a Subsidiary that is a “controlled foreign corporation” under Section 957 of the Code. “Gathering Station Real Property” means on any date of determination, any Real Property on which any Gathering Station owned, held or leased by any Issuer or Subsidiary Guarantor at such time is located (including, as of the date hereof, the Closing Date Gathering Station Real Property). “Gathering Stations” means collectively, (a) each location, now owned or hereafter used, acquired, constructed, built or otherwise obtained by the Issuer or any Subsidiary Guarantor, where the Issuer or any such Subsidiary Guarantor uses, holds, stores or maintains compression and dehydration equipment, other than any such compression and dehydration equipment that, as of the applicable date of

5 determination, (i) has not been used by the Issuer or any Restricted Subsidiary for the conduct of its Midstream Activities for a period of at least thirty (30) days, and (ii) neither the Issuer nor any Restricted Subsidiary intends to use for the conduct of Midstream Activities, and (b) any other processing plants and terminals, now or hereafter owned by the Issuer or any Subsidiary Guarantor, that are connected to (or are intended to be connected to) the Pipeline Systems. “Gathering System Real Property” means, collectively, the Gathering Station Real Property and the Pipeline Systems Real Property. “General Intangibles” means all “General Intangibles” as defined in the New York UCC, including all choses in action and causes of action and all other intangible personal property of any Grantor of every kind and nature (other than Accounts) now owned or hereafter acquired by any Grantor, including corporate or other business records, indemnification claims, contract rights (including rights under leases, whether entered into as lessor or lessee and other agreements), Intellectual Property, goodwill, registrations, franchises and tax refund claims. “Governmental Authority” means any federal, state, local, foreign or other agency, authority, body, commission, court, instrumentality, political subdivision, central bank, or other entity or officer exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions for any governmental, judicial, investigative, regulatory or self-regulatory authority (including the Financial Conduct Authority, the Prudential Regulation Authority and any supra-national bodies such as the European Union or European Central Bank). “Grantor” means the Issuer and each Person listed on the signature pages hereof as a “Grantor”, together with each other Subsidiary of the Issuer, or other Person, that from time to time becomes a party to this Agreement in the capacity of a “Grantor” pursuant to Section 6.15 hereof. “Guarantors” means, with respect to all Secured Obligations, the Parent and each Subsidiary Guarantor. “Indemnifying Obligor” has the meaning assigned to such term in Section 5.01. “Indenture” has the meaning assigned to such term in the recitals hereto. “Intellectual Property” means all Patents, Copyrights, Trademarks, IP Agreements, Trade Secrets, domain names, and all inventions, designs, confidential or proprietary technical and business information, know-how, show-how and other proprietary data or information and all related documentation. “Intellectual Property Claim” means any claim or assertion (whether in writing, by suit or otherwise) that the Issuer’s or any Restricted Subsidiary’s ownership, use, marketing, sale or distribution of any Inventory, Equipment, Intellectual Property or other Property violates another Person’s Intellectual Property in any material respect. “Intercreditor Agreement” means that certain Intercreditor Agreement dated as of November 2, 2021 (as supplemented by that certain Joinder Agreement dated as of November 14, 2022, as reaffirmed and amended by that certain Notice and Reaffirmation of Intercreditor Agreement as of the date hereof) among Bank of America, N.A., as the Initial First Lien Representative and the Initial First Lien Collateral Agent for the Initial First Lien Claimholders, Regions Bank, as the Initial Second Lien Representative and the Initial Second Lien Collateral Agent for the Initial Second Lien Claimholders, Regions, as an Additional Second Lien Representative and an Additional Second Lien Collateral Agent, and acknowledged and

6 agreed to by Summit Midstream Holdings, LLC, as the Issuer and the other Grantors referred to therein (as such terms are defined therein). “Investment Property Collateral” has the meaning assigned to such term in Section 4.04. “IP Agreements” means all agreements granting to or receiving from a third party any rights to Intellectual Property to which any Grantor, now or hereafter, is a party. “Issuer” has the meaning assigned to such term in the introductory paragraph hereto. “Xxxxxx Act” has the meaning assigned to such term in the definition of “Excluded Assets”. “Manufactured (Mobile) Home” has the meaning assigned to such term in the applicable Flood Law. “Material Adverse Effect” means a material adverse effect on the condition (financial or otherwise), results of operations, members’ equity, partners’ capital or shareholders’ equity, properties, business or prospects of the Obligors, taken as a whole. “Midstream Activities” means with respect to any Person, collectively, the treatment, processing, gathering, dehydration, compression, blending, transportation, terminalling, storage, transmission, marketing, buying or selling or other disposition, whether for such Person’s own account or for the account of others, of oil, natural gas, natural gas liquids or other liquid or gaseous hydrocarbons, including that used for fuel or consumed in the foregoing activities, and water gathering and related activities in connection therewith; provided, that “Midstream Activities” shall in no event include the drilling, completion or servicing of oil or gas xxxxx, including, the ownership of drilling rigs. “Mortgage” means any mortgage, deed of trust or any other document creating and evidencing a Lien on Real Property, including Gathering System Real Property, in favor of the Collateral Agent, for the benefit of the Secured Parties, as security for any Secured Obligations, including all such changes as may be required to account for local law matters, as the same may be amended, supplemented or otherwise modified from time to time in accordance with the Note Documents. “New York UCC” means the Uniform Commercial Code as from time to time in effect in the State of New York. “Obligor” means each Grantor, Guarantor and Pledgor hereunder. “Parent” has the meaning assigned to such term in the introductory paragraph hereto. “Patents” means all of the following: (a) all letters patent of the United States or the equivalent thereof in any other country or group of countries, and all applications for letters patent of the United States or the equivalent thereof in any other country or group of countries, including those listed on Schedule II, (b) all reissues, continuations, divisions, continuations-in-part or extensions thereof, and the inventions disclosed or claimed therein, including the right to make, use and/or sell the inventions disclosed or claimed therein and (c) the right to sue or otherwise recover for any past, present and future infringement or other violation of any of the foregoing.

7 “Perfection Certificate” means a certificate in substantially the same form and substance as the Perfection Certificate (as defined in the ABL Facility) delivered to the Initial First Lien Representative on or about the date hereof. “Pipeline Systems” means collectively, (a) the natural gas gathering pipelines and other appurtenant facilities such as meters and valve yard facilities owned by the Issuer, any Subsidiary Guarantor or any Restricted Subsidiary in connection with its or their Midstream Activities and (b) any other pipelines and other appurtenant facilities such as meters and valve yard facilities, located in Texas, Colorado, North Dakota, Wyoming or any other state, now or hereafter owned by one or more of the Issuer, any Subsidiary Guarantor or any Restricted Subsidiary in connection with its or their Midstream Activities. “Pipeline Systems Real Property” means on any date of determination, any Real Property on which any Pipeline System owned, held or leased by the Issuer or any Subsidiary Guarantor at such time is located (including, without limitation, as of the date hereof, the Closing Date Pipeline Systems Real Property). “Pledged Certificated Securities” means security certificates or instruments now or hereafter included in the Pledged Collateral. “Pledged Collateral” has the meaning assigned to such term in Section 2.01. “Pledged Debt” has the meaning assigned to such term in Section 2.01. “Pledged Interests Issuer” means each Person identified in Schedule I hereto as the issuer of Pledged Stock and each other Person that is the issuer of any Pledged Stock after the date hereof. “Pledged Stock” has the meaning assigned to such term in Section 2.01. “Pledgor” means each Person listed on the signature pages hereof as a “Pledgor”, together with each other Subsidiary of the Issuer, or other Person, that from time to time becomes a party to this Agreement in the capacity of a “Pledgor” pursuant to Section 6.15 hereof. “Property” means any interest in any kind of property or asset, whether real, personal or mixed, or tangible or intangible. “Real Property” means collectively, all right, title and interest (whether as owner, lessor or lessee) of the Issuer or any Restricted Subsidiary in and to any and all parcels of real Property owned or leased by, or subject to any rights of way, easements, servitudes, permits, licenses or other instruments in favor of, the Issuer or any Restricted Subsidiary together with all improvements and appurtenant fixtures, easements and other property and rights incidental to the ownership, lease, occupancy, use or operation thereof. “Regions” has the meaning assigned to such term in the introductory paragraph hereto. “Secured Obligations” means the Note Obligations, including all indemnification obligations specified in Section 6.05 hereof. “Secured Parties” means, collectively, the Collateral Agent, the Trustee, each Holder and each other holder or obligee in respect of the Secured Obligations. “Security Interest” has the meaning assigned to such term in Section 3.01.

8 “SMC” means Summit Midstream Corporation, a Delaware corporation. “Subsidiary Guarantor” means each Person listed on the signature pages hereof as a “Subsidiary Guarantor”, together with each other Subsidiary of the Issuer, or other Person, that from time to time becomes a party to this Agreement in the capacity of a “Subsidiary Guarantor” pursuant to Section 6.15 hereof. “Summit Permian” means Summit Midstream Permian, LLC, a Delaware limited liability company. “Summit Permian Finance” means Summit Midstream Permian Finance, LLC, a Delaware limited liability company. “Taxes” means any and all present or future taxes, levies, imposts, duties (including stamp duties), deductions, charges (including ad valorem charges) or withholdings imposed by any Governmental Authority and any and all additions to tax, interest and penalties related thereto. “Trade Secrets” means common law and statutory trade secrets and all other confidential or proprietary or useful information and all know-how obtained by or used in or contemplated at any time for use in the business of any Grantor, whether or not any of the foregoing has been reduced to a writing or other tangible form, including all documents and things embodying, incorporating or referring in any way to the foregoing, all licenses related to the foregoing, and including the right to sue for and to enjoin and to collect damages for the actual or threatened misappropriation of any of the foregoing and for the breach or enforcement of any license related to the foregoing. “Trademarks” means all of the following: (a) all domestic and foreign trademarks, trade names, service marks, corporate names, company names, business names, fictitious business names, trade styles, trade dress, logos, service marks, other source or business identifiers, designs and General Intangibles of like nature, now owned or hereafter adopted or acquired, all registrations thereof, if any, including all registration and recording applications filed in connection therewith in the United States Patent and Trademark Office listed on Schedule II and all renewals thereof, including those listed on Schedule II (provided that no security interest shall be granted in United States intent-to-use trademark applications to the extent that, and solely during the period, if any, in which, the grant of a security interest therein would impair the validity or enforceability of such intent-to-use trademark applications under applicable federal law), (b) all goodwill associated therewith or symbolized thereby and (c) the right to sue or otherwise recover for any past, present and future infringement, dilution or other violation of any of the foregoing or for any injury to the related goodwill. “Trustee” has the meaning assigned to such term in the recitals hereto. “UCC” or “Uniform Commercial Code” means the Uniform Commercial Code as in effect in the applicable jurisdiction. Section 1.03 Intercreditor Agreements. (a) Notwithstanding anything herein to the contrary, (i) the liens and security interests granted to the Collateral Agent pursuant to this Agreement are expressly subject and subordinate to the liens and security interests granted in favor of the First Lien Claimholders, including liens and security interests granted to Bank of America, N.A., as collateral agent, pursuant to or in connection with the ABL Facility, as such agreement has been or may be, in whole or in part, in one or more instances, amended, restated,

11 (b) the Pledged Stock and Pledged Debt have been duly and validly authorized and issued by the issuers thereof and (i) in the case of Pledged Stock, are fully paid and nonassessable and (ii) in the case of Pledged Debt, are legal, valid and binding obligations of the issuers thereof (subject to applicable bankruptcy, reorganization, insolvency, moratorium or similar laws affecting creditors’ rights generally and subject, as to enforceability, to equitable principles of general application (regardless of whether enforcement is sought in a proceeding in equity or at law)); (c) except for the security interests granted hereunder, such Pledgor (i) is and, subject to any transfers or dispositions made in compliance with the Indenture and the other Note Documents, will continue to be the direct owner, beneficially and of record, of the Pledged Collateral indicated on Schedule I as owned by such Pledgor, (b) holds the same free and clear of all Liens (other than Permitted Liens), (c) will make no assignment, pledge, hypothecation or transfer of, or create or permit to exist any security interest in or other Lien on, the Pledged Collateral (other than Permitted Liens) and (d) will defend its title or interest thereto or therein against any and all Liens (other than Permitted Liens), however arising, of all persons whomsoever; and (d) by virtue of the execution and delivery by such Pledgor of this Agreement, when any Pledged Collateral that is represented by a certificate is delivered to the Collateral Agent (or its gratuitous bailee) in any jurisdiction that has adopted the New York UCC in accordance with this Agreement, together with duly executed stock powers with respect thereto, the Collateral Agent will obtain a legal, valid and perfected Lien upon and security interest in such Pledged Collateral under the UCC, as security for the payment and performance of the Secured Obligations. Section 2.04 Certain Representations and Warranties by the Parent. The Parent, in its capacity as a Pledgor hereunder, represents and warrants on behalf of and in respect of itself to the Collateral Agent and each Secured Party that: (a) Organization; Powers. The Parent (i) is duly organized, and validly existing in the jurisdiction of its incorporation, organization or formation, (ii) has all requisite power and authority to own its property and assets and to carry on its business as now conducted, (iii) is in good standing (to the extent that such concept is applicable in the relevant jurisdiction) and qualified to do business in each jurisdiction (including its jurisdiction of incorporation, organization or formation) where such qualification is required, except where the failure, individually or in the aggregate, to so qualify or to be in good standing could not reasonably be expected to have a material adverse effect on the Parent’s pledge of Pledged Collateral in support of the Secured Obligations and (iv) has the power and authority to execute, deliver and perform its obligations under this Agreement and each other agreement or instrument contemplated hereby to which it is or will be a party. (b) Authorization. The execution, delivery and performance by the Parent of this Agreement (i) has been duly authorized by all necessary limited partnership action required to be obtained by the Parent and (ii) will not (A) violate (1) any provision of law, statute, rule or regulation, or of the certificate of partnership or other constitutive documents or limited partnership agreement of the Parent, (2) any applicable order of any court or any rule, regulation or order of any Governmental Authority or (3) any provision of any indenture, lease, agreement or other instrument to which the Parent is a party or by which it or its property is or may be bound, (B) be in conflict with, result in a breach of or constitute (alone or with notice or lapse of time or both) a default under, give rise to a right of or result in any cancellation or acceleration of any right or obligation (including any payment) or to a loss of a material benefit under any such indenture, lease, agreement or other instrument, where any such conflict, violation, breach or default referred to in subclause (A)(3) and (B) of this clause (ii), could reasonably be expected have a material

15 (vii) all Goods, including Inventory, Equipment and Fixtures, including, the Pipeline Systems now owned or hereafter acquired or constructed by such Obligor; (viii) all Instruments; (ix) all Investment Property; (x) all Letters of Credit and Letter-of-Credit Rights; (xi) all As-Extracted Collateral; (xii) all Software; (xiii) all Supporting Obligations; (xiv) all monies, whether or not in the possession or under the control of the Collateral Agent or a bailee or Affiliate of the Collateral Agent other than monies in Excluded Accounts; (xv) all accessions to, substitutions for, and all replacements, products, and cash and non-cash proceeds of the foregoing, including proceeds of and unearned premiums with respect to insurance policies, and claims against any Person for loss, damage or destruction of any Collateral; and (xvi) all books and records (including customer lists, files, correspondence, tapes, computer programs, print-outs and computer records) and other property relating to, used or useful in connection with, evidencing, embodying, incorporating or referring to, or pertaining to any of pertaining to the foregoing. Notwithstanding the foregoing, (a) Collateral shall not include the Excluded Assets; provided that proceeds and other assets or Property received, arising from, in exchange for or in respect of any Excluded Assets shall automatically (and without any further action) be subject to the security interest and Lien granted by the applicable Grantor pursuant to this Section 3.01 and shall constitute Collateral hereunder (unless any such assets or Property are themselves Excluded Assets) and (b) no Obligor shall be required to take any action with respect to the perfection of security interests in motor vehicles and other assets subject to a certificate of title other than any Compression Unit that is covered by a certificate of title, Letter-of-Credit Rights that have a face amount of less than $5,000,000 in the aggregate, any Commercial Tort Claim reasonably estimated to be less than $5,000,000 or Excluded Accounts. The applicable Obligors shall from time to time at the request of the Collateral Agent give written notice to the Collateral Agent identifying in reasonable detail Excluded Assets and shall provide to the Collateral Agent such other information regarding the Excluded Assets as the Collateral Agent may reasonably request. (b) [Reserved.] (c) Subject to the Intercreditor Agreement and any Second Lien Pari Passu Intercreditor Agreement, each Grantor hereby irrevocably authorizes (but does not obligate) the Collateral Agent at any time and from time to time to file in any relevant jurisdiction any initial financing statements (including Fixture filings and transmitting utility filings with respect to Fixtures situated on Real Property (regardless of whether such real property is owned by an Issuer or a Guarantor or is owned by a Person other than an Issuer or a Guarantor)), continuation statements, amendments, other filings and recordings, with respect to

17 (b) This Agreement has been duly executed and delivered by each Obligor (in its capacity as a Pledgor and/or Grantor, as applicable) and constitutes a legal, valid and binding obligation of such Obligor in such capacities enforceable against each such Obligor in such capacities in accordance with its terms, subject to (i) the effects of bankruptcy, insolvency, moratorium, reorganization, fraudulent conveyance or other laws affecting creditors’ rights generally, (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law) and (iii) implied covenants of good faith and fair dealing. (c) A Perfection Certificate, dated the date hereof, has been completed, duly executed by each Obligor and delivered to the Collateral Agent, together with all attachments contemplated thereby and the information set forth therein, including the exact legal name of each Obligor, is correct and complete, in all material respects, as of the date hereof. (d) The Security Interest constitutes (i) a legal and valid security interest in all the Article 9 Collateral securing the payment and performance of the Secured Obligations under the New York UCC, (ii) upon the filing of appropriate financing statements with respect to the Article 9 Collateral in the filing offices of the appropriate jurisdictions, a perfected security interest in all Article 9 Collateral in which a security interest may be perfected by filing, recording or registering a financing statement or analogous document in the United States (or any political subdivision thereof) and its territories and possessions pursuant to the Uniform Commercial Code or other applicable law in such jurisdictions and (iii) to the extent that a Grantor has Article 9 Collateral consisting of Intellectual Property set forth on Schedule II hereof (as such Schedule is updated from time to time), a security interest that shall be perfected in all Article 9 Collateral in which a security interest may be perfected upon the receipt and recording of a fully executed agreement, in form reasonably acceptable to the Collateral Agent and in form and substance reasonably acceptable to the Issuer, with the United States Copyright Office. The Security Interest shall be prior to any other Lien on any of the Article 9 Collateral other than Permitted Liens. (e) The Article 9 Collateral is owned by the Grantors free and clear of any Lien, other than Permitted Liens. None of the Grantors has filed or consented to the filing of (i) any financing statement or analogous document under the Uniform Commercial Code (including the New York UCC) in any applicable jurisdiction or any other applicable laws covering any Article 9 Collateral, (ii) any assignment in which any Grantor assigns any Article 9 Collateral or any security agreement or similar instrument covering any Article 9 Collateral with the United States Patent and Trademark Office or the United States Copyright Office or (iii) any assignment in which any Grantor assigns any Article 9 Collateral or any security agreement or similar instrument covering any Article 9 Collateral with any foreign governmental, municipal or other office, which financing statement or analogous document, assignment, security agreement or similar instrument is still in effect, except, in each case of (i) through (iii) of this Section 3.02(e), for financing statements or assignments with respect to Permitted Liens. (f) None of the Grantors holds any Commercial Tort Claim individually in excess of the $5,000,000 except as indicated on Schedule III hereto, as such schedule may be updated or supplemented from time to time. (g) All Accounts constituting Article 9 Collateral have been originated by the Grantors and all Inventory constituting Article 9 Collateral has been acquired by the Grantors in the ordinary course of business. All Equipment and Inventory constituting Article 9 Collateral are in the exclusive control of one or more Grantors (other than Equipment and Inventory in transit or in the possession of third parties in the ordinary course of business).

19 (d) At its option, the Collateral Agent may discharge past due Taxes, Liens, or other encumbrances at any time levied or placed on any Article 9 Collateral other than those which are Permitted Liens, and may pay for the maintenance and preservation of the Article 9 Collateral to the extent any Grantor fails to do so as required by the Indenture or this Agreement; and each Grantor jointly and severally agrees to reimburse the Collateral Agent on demand for any payment or any reasonable expense incurred by the Collateral Agent pursuant to the foregoing authorization; provided, that such Grantor shall not be obligated to reimburse Collateral Agent with respect to any Article 9 Collateral consisting of Intellectual Property which any Grantor has failed to maintain or pursue, or otherwise has allowed to lapse, terminate or put in the public domain (and such Grantor has provided prior notice to the Collateral Agent of such fact) and provided, further, that nothing in this Section 3.03(d) shall be interpreted as excusing any Grantor from the performance of, or imposing any obligation on the Collateral Agent or any Secured Party (i) to cure or perform, any covenants or other promises of any Grantor with respect to Taxes, Liens or other encumbrances or (ii) to maintain any of the Article 9 Collateral as set forth herein. (e) Each Grantor (rather than the Collateral Agent or any Secured Party) shall remain liable for the observance and performance of all the conditions and obligations to be observed and performed by it under each contract, agreement or instrument relating to or constituting Article 9 Collateral and each Grantor jointly and severally agrees to indemnify and hold harmless the Collateral Agent and the Secured Parties from and against any and all liability for such performance. (f) None of the Grantors shall make or permit to be made an assignment, pledge or hypothecation of the Article 9 Collateral or shall grant any other Lien in respect of the Article 9 Collateral, except as expressly permitted by the Indenture. None of the Grantors shall make or permit to be made any transfer of the Article 9 Collateral and each Grantor shall remain at all times in control of the Article 9 Collateral owned by it (other than Equipment and Inventory in transit or in the possession of third parties in the ordinary course of business), except as permitted by the Indenture. (g) Following the Discharge of First Lien Obligations, each Grantor will, and the Issuer will cause each of its Restricted Subsidiaries to, name the Collateral Agent as loss payee on all casualty and property insurance policies of the Issuer and its Restricted Subsidiaries other than insurance policies related solely to Excluded Assets, to the extent such policies name another Person as loss payee. (h) Subject to the Intercreditor Agreement, without limiting Section 6.06, each Grantor irrevocably makes, constitutes and appoints the Collateral Agent (and all officers, employees or agents designated by the Collateral Agent) as such Grantor’s true and lawful attorney-in-fact for the purpose, during the continuance of an Event of Default, of making, settling and adjusting claims in respect of Article 9 Collateral under policies of insurance covering the Article 9 Collateral, endorsing the name of such Grantor on any check, draft, instrument or other item of payment for the proceeds of such policies of insurance and for making all determinations and decisions with respect thereto. In the event that any Grantor at any time or times shall fail to obtain or maintain any of the policies of insurance required by Section 3.03(g) of this Agreement, or to pay any premium in whole or part relating thereto, the Collateral Agent may, without waiving or releasing any obligation or liability of the Grantors hereunder or any Event of Default, in its reasonable discretion, obtain and maintain such policies of insurance and pay such premium and take any other actions with respect thereto as the Collateral Agent reasonably deems necessary. All sums disbursed by the Collateral Agent in connection with this Section 3.03(h), including reasonable attorneys’ fees, court costs, expenses and other out-of-pocket charges relating thereto, shall be payable, within 30 days after written demand for such is received by the Issuer, by the Grantors to the Collateral Agent and shall be additional Secured Obligations secured hereby.

22 (c) Without limiting the generality of the foregoing, subject to the terms of the Intercreditor Agreement and any Second Lien Pari Passu Intercreditor Agreement, each Obligor agrees that the Collateral Agent shall have the right, subject to the mandatory requirements of applicable law, upon the occurrence and during the continuance of an Event of Default, to sell or otherwise dispose of all or any part of the Collateral at a public or private sale or at any broker’s board or on any securities exchange, for cash, upon credit or for future delivery as the Collateral Agent shall deem appropriate. The Collateral Agent shall be authorized in connection with any sale of a security (if it deems it advisable to do so) pursuant to the foregoing to restrict the prospective bidders or purchasers to Persons who represent and agree that they are purchasing such security for their own account, for investment, and not with a view to the distribution or sale thereof. Upon consummation of any such sale of Collateral pursuant to this Section 4.01, the Collateral Agent shall have the right to assign, transfer and deliver to the purchaser or purchasers thereof the Collateral so sold. Each such purchaser at any such sale shall hold the property sold absolutely, free from any claim or right on the part of any Obligor, and each Obligor hereby waives and releases (to the extent permitted by law) all rights of redemption, stay, valuation and appraisal that such Obligor now has or may at any time in the future have under any rule of law or statute now existing or hereafter enacted; and (d) The Collateral Agent may also exercise any other remedy available at law or equity. (e) The Collateral Agent shall give the applicable Obligors 10 Business Days’ written notice (which each Obligor agrees is reasonable notice within the meaning of Section 9-611 of the New York UCC or its equivalent in other jurisdictions) of the Collateral Agent’s intention to make any sale of Collateral. Such notice, in the case of a public sale, shall state the time and place for such sale and, in the case of a sale at a broker’s board or on a securities exchange, shall state the board or exchange at which such sale is to be made and the day on which the Collateral, or portion thereof, will first be offered for sale at such board or exchange. Any such public sale shall be held at such time or times within ordinary business hours and at such place or places as the Collateral Agent may fix and state in the notice (if any) of such sale. At any such sale, the Collateral, or the portion thereof, to be sold may be sold in one lot as an entirety or in separate parcels, as the Collateral Agent may (in its sole and absolute discretion) determine. The Collateral Agent shall not be obligated to make any sale of any Collateral if it shall determine not to do so, regardless of the fact that notice of sale of such Collateral shall have been given. The Collateral Agent may, without notice or publication, adjourn any public or private sale or cause the same to be adjourned from time to time by announcement at the time and place fixed for sale, and such sale may, without further notice, be made at the time and place to which the same was so adjourned. In the case of any sale of all or any part of the Collateral made on credit or for future delivery, the Collateral so sold may be retained by the Collateral Agent until the sale price is paid by the purchaser or purchasers thereof, but the Collateral Agent shall not incur any liability in the event that any such purchaser or purchasers shall fail to take up and pay for the Collateral so sold and, in the case of any such failure, such Collateral may be sold again upon notice given in accordance with provisions above. At any public (or, to the extent permitted by law, private) sale made pursuant to this Section 4.01, any Secured Party may bid for or purchase for cash, free (to the extent permitted by law) from any right of redemption, stay, valuation or appraisal on the part of any Obligor (all such rights being also hereby waived and released to the extent permitted by law), the Collateral or any part thereof offered for sale and may (subject to the Collateral Agent’s consent) make payment on account thereof by using any claim then due and payable pursuant to the Note Documents to such Secured Party from any Obligor as a credit against the purchase price, and such Secured Party may, upon compliance with the terms of sale, hold, retain and dispose of such property without further accountability to any Obligor therefor. For purposes hereof, a written agreement to purchase the Collateral or any portion thereof shall be treated as a sale thereof; the Collateral Agent shall be free to carry out such sale pursuant to such agreement and no Obligor shall be entitled to the return of the Collateral or any portion thereof subject thereto, notwithstanding the fact that after the Collateral Agent shall have entered into such an agreement

23 all Events of Default shall have been remedied and the Secured Obligations paid in full. The Collateral Agent may sell the Collateral without giving any warranties as to the Collateral. The Collateral Agent may specifically disclaim or modify any warranties of title or the like. This procedure will not be considered to adversely affect the commercial reasonableness of any sale of the Collateral. As an alternative to exercising the power of sale herein conferred upon it, the Collateral Agent may proceed by a suit or suits at law or in equity to foreclose upon the Collateral and to sell the Collateral or any portion thereof pursuant to a judgment or decree of a court or courts having competent jurisdiction or pursuant to a proceeding by a court-appointed receiver. Any sale pursuant to the provisions of this Section 4.01 shall be deemed to conform to the commercially reasonable standards as provided in Section 9-610(b) of the New York UCC or its equivalent in other jurisdictions. Each Obligor shall remain liable for any deficiency if the proceeds of any sale or other disposition of the Collateral are insufficient to pay the Secured Obligations and the reasonable fees and disbursements of any external attorneys employed by the Collateral Agent or any other Secured Party to collect such deficiency. Notwithstanding the foregoing, this Section 4.01 is subject to the terms of the Intercreditor Agreement in all respects. Section 4.02 Application of Proceeds. Subject to the terms of the Intercreditor Agreement and any Second Lien Pari Passu Intercreditor Agreement, all cash proceeds received by the Collateral Agent in respect of any sale of, collection from, or other realization upon all or any part of the Collateral shall be promptly applied by the Collateral Agent as set forth in Section 6.10 of the Indenture. The Collateral Agent shall have absolute discretion as to the time of application of any such proceeds, moneys or balances in accordance with this Agreement and the other Note Documents. Upon any sale of Collateral by the Collateral Agent (including pursuant to a power of sale granted by statute or under a judicial proceeding), the receipt of the purchase money by the Collateral Agent or of the officer making the sale shall be a sufficient discharge to the purchaser or purchasers of the Collateral so sold and such purchaser or purchasers shall not be obligated to see to the application of any part of the purchase money paid over to the Collateral Agent or such officer or be answerable in any way for the misapplication thereof. Section 4.03 Grant of License to Use Intellectual Property. For the purpose of enabling the Collateral Agent to exercise rights and remedies under this Agreement at such time as the Collateral Agent shall be lawfully entitled to exercise such rights and remedies, each Grantor shall, upon request by the Collateral Agent at any time after and during the continuance of an Event of Default, grant to (in the Collateral Agent’s sole discretion) the Collateral Agent or a designee of the Collateral Agent, for the ratable benefit of the Secured Parties, an irrevocable, nonexclusive license (exercisable without payment of royalty or other compensation to any Grantor) to use, license or, solely to the extent necessary to exercise such rights and remedies, sublicense Intellectual Property constituting Article 9 Collateral, now owned or hereafter acquired by such Grantor, wherever the same may be located, and including, without limitation, in such license reasonable access to all media in which any of the licensed items may be recorded or stored and to all computer software and programs used for the compilation or printout thereof; provided, however, that nothing in this Section 4.03 shall require such Grantor to grant any license that is prohibited by any rule of law, statute or regulation or is prohibited by, or constitutes a breach or default under or results in the termination of or gives rise to any right of acceleration, modification or cancellation under any contract, license, agreement, instrument or other document evidencing, giving rise to a right to use or theretofore granted with respect to such property; provided, further, that such licenses to be granted hereunder with respect to Trademarks shall be subject to the maintenance of quality standards with respect to the goods

31 Section 6.15 Additional Subsidiary Obligors. Any Subsidiary of the Issuer may become a party hereto by signing and delivering to the Collateral Agent a Collateral Agreement Supplement, substantially in the form of Exhibit I hereto (with such changes and modifications thereto as may be required by any Applicable Laws), whereupon such Subsidiary shall become an “Obligor”, a “Subsidiary Guarantor”, a “Pledgor” and a “Grantor” (or any one or more of the foregoing) defined herein with the same force and effect as if originally named as an Obligor, a Subsidiary Guarantor, a Pledgor and a Grantor (or any one or more of the foregoing), as applicable, herein. Any such Subsidiary becoming a party to this Agreement pursuant to this Section 6.15 will enter into this Agreement in the capacity or capacities (and only capacity or capacities) set forth on the signature page to such Collateral Agreement Supplement. The execution and delivery of any such instrument shall not require the consent of any other party to this Agreement. The rights and obligations of each party to this Agreement shall remain in full force and effect notwithstanding the addition of any new party to this Agreement. Section 6.16 Indenture. If any conflict exists between this Agreement and the Indenture, the Indenture shall govern. Section 6.17 Authority of Collateral Agent. Each Obligor acknowledges that the rights and responsibilities of the Collateral Agent under this Agreement with respect to any action taken by the Collateral Agent or the exercise or nonexercise by the Collateral Agent of any option, voting right, request, judgment or other right or remedy provided for herein or resulting or arising out of this Agreement shall, as among the Secured Parties, be governed by the Indenture, the Intercreditor Agreement, any Second Lien Pari Passu Intercreditor Agreement and by such other agreements with respect thereto as may exist from time to time among them, but, as between the Collateral Agent and the Obligors, the Collateral Agent shall be conclusively presumed to be acting as agent for the Secured Parties with full and valid authority so to act or refrain from acting, and no Obligor shall be under any obligation, or entitlement, to make any inquiry respecting such authority. The Collateral Agent has been appointed to act as Collateral Agent hereunder by the Holders and, by their acceptance of the benefits hereof, the other Secured Parties. The Collateral Agent shall be obligated, and shall have the right hereunder, to make demands, to give notices, to exercise or refrain from exercising any rights, and to take or refrain from taking any action (including the release or substitution of Collateral), solely in accordance with this Agreement and the other Note Documents. Section 6.18 Other Secured Parties. By its acceptance of its note and the benefits hereof, each Holder thereby (a) confirms that it has received a copy (or description of the material terms of) the Notes Documents and such other documents and information as it has deemed appropriate to make its own decision to become a Secured Party and acknowledges that it is aware of the contents of, and consents to the terms of, the Note Documents, (b) appoints and authorizes the Collateral Agent to take such action as agent on its behalf and to exercise such powers and discretion under the Indenture, the other Note Documents or any other instrument or document furnished pursuant hereto or thereto as are delegated to the Collateral Agent by the terms hereof or thereof, together with such powers as are incidental thereto, (c) agrees that it will be bound by the provisions of the Note Documents and will perform in accordance with their terms all such obligations which by the terms of such documents are required to be performed by it as a Secured Party and will take no actions contrary to such obligations, and (d) authorizes and instructs the Collateral Agent to enter into the Note Documents as Collateral Agent and on behalf of such Secured Party. Section 6.19 Limitations. The Lien on Collateral granted hereunder is given as security only and shall not subject the Collateral Agent or any Holders to, or in any way modify, any obligation or liability of the Issuer relating to any Collateral. Section 6.20 The Collateral Agent. The Collateral Agent shall be entitled to all of the protections, immunities, rights and indemnities provided to it in the Indenture.

32 [Signature Pages Follow]

Signature Page to Collateral Agreement IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their respective officers thereunto duly authorized, as of the date first above written. SUMMIT MIDSTREAM PARTNERS, LP, as the Parent and a Pledgor By: SUMMIT MIDSTREAM GP, LLC, its general partner By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Executive Vice President and Chief Financial Officer SUMMIT MIDSTREAM HOLDINGS, LLC, as an Issuer, a Pledgor and a Grantor By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Executive Vice President and Chief Financial Officer

Signature Page to Collateral Agreement GRAND RIVER GATHERING, LLC RED ROCK GATHERING COMPANY, LLC SUMMIT MIDSTREAM NIOBRARA, LLC DFW MIDSTREAM SERVICES LLC POLAR MIDSTREAM, LLC EPPING TRANSMISSION COMPANY, LLC SUMMIT MIDSTREAM MARKETING, LLC SUMMIT MIDSTREAM PERMIAN II, LLC MEADOWLARK MIDSTREAM COMPANY, LLC SUMMIT DJ-O, LLC SUMMIT DJ-S, LLC SUMMIT DJ-O OPERATING, LLC GRASSLANDS ENERGY MARKETING LLC each as a Pledgor and a Grantor By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Executive Vice President and Chief Financial Officer SUMMIT MIDSTREAM OPCO, LP, as a Pledgor and a Grantor By: SUMMIT MIDSTREAM MARKETING, LLC, its general partner By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Executive Vice President and Chief Financial Officer

Signature Page to Collateral Agreement REGIONS BANK as the Collateral Agent on behalf of the Secured Parties By: /s/ Xxxxx Xxxxxxxx Name: Xxxxx Xxxxxxxx Title: Sr. Vice President

Exhibit I – Page 1 Exhibit I to the Collateral Agreement FORM OF COLLATERAL AGREEMENT SUPPLEMENT This SUPPLEMENT NO. [__] dated as of [_____________], 20[__] (this “Supplement”), to the COLLATERAL AGREEMENT, dated as of July 26, 2024 (as amended, restated, amended and restated, supplemented, waived or otherwise modified or replaced from time to time, the “Collateral Agreement”), among SUMMIT MIDSTREAM HOLDINGS, LLC, Delaware limited liability company (the “Issuer”), each Subsidiary listed on the signature pages thereof as a “Pledgor” and/or “Grantor”, each Subsidiary that shall, at any time after the date thereof, become a Pledgor and/or Grantor pursuant to Section 6.15 thereof, SUMMIT MIDSTREAM PARTNERS, LP, a Delaware limited partnership (the “Parent”), and REGIONS BANK (“Regions”), as collateral agent (in such capacity, together with its successors and assigns in such capacity, the “Collateral Agent”) for the Secured Parties. A. Reference is made to the Indenture dated as of even date with the Collateral Agreement (as may be amended, restated, amended and restated, supplemented, extended, renewed, refinanced, waived or otherwise modified or replaced from time to time, the “Indenture”), among the Issuer, the Parent, Regions, as the trustee and the collateral agent and the other Persons from time to time party thereto. B. Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to such terms in the Indenture and the Collateral Agreement, as applicable. C. Section 6.15 of the Collateral Agreement provides that any additional Subsidiary may become a Subsidiary Guarantor, a Grantor, a Pledgor or any or all of the foregoing under the Collateral Agreement by execution and delivery of an instrument substantially in the form of this Supplement (with such changes and modifications hereto as may be required by the laws of any applicable foreign jurisdiction to the extent applicable). The undersigned Subsidiary (the “New Subsidiary”) is executing this Supplement, in accordance with the requirements of the Indenture, to become an Obligor in the capacity under the Collateral Agreement as specified on the signature page hereto. Accordingly, the Collateral Agent and the New Subsidiary agree as follows: SECTION 1. In accordance with Section 6.15 of the Collateral Agreement, the New Subsidiary by its signature below and delivery of such executed signature page to the Collateral Agent becomes, to the extent specified on the signature page hereto, a “Subsidiary Guarantor”, “Pledgor” and “Grantor” (or any one or more of the foregoing; provided that if the signature page hereto fails to state the capacity or capacities in which such New Subsidiary is entering the Collateral Agreement, then such New Subsidiary shall join in each such capacity) under the Collateral Agreement with the same force and effect as if originally named therein as an Obligor, and the New Subsidiary hereby (a) agrees to all the terms and provisions of the Collateral Agreement applicable to it as a Guarantor, Pledgor and Grantor or any one or more of the foregoing, as applicable, thereunder and (b) represents and warrants that the representations and warranties made by it as a Pledgor and Grantor or any one or more of the foregoing, as applicable, thereunder (as supplemented by the attached supplemental schedules to the Collateral Agreement) are true and correct, in all material respects, on and as of the date hereof, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they shall be true and correct, in all material respects, as of such earlier date. SECTION 2. In furtherance of the foregoing, to the extent the New Subsidiary is joining the Collateral Agreement as a Pledgor, and as security for the indefeasible payment in full and performance of

Exhibit I – Page 2 all of the Secured Obligations, the New Subsidiary hereby pledges, hypothecates, assigns, charges, mortgages, delivers, and transfers to the Collateral Agent, its successors and assigns, for the ratable benefit of the Secured Parties, and hereby grants to the Collateral Agent, its successors and assigns, for the ratable benefit of the Secured Parties, a continuing security interest in all of the New Subsidiary’s right, title and interest in, to and under and whether direct or indirect, whether legal, beneficial, or economic, whether fixed or contingent and whether now or hereafter existing or arising in all of its Property constituting Pledged Collateral. SECTION 3. In furtherance of the foregoing, to the extent the New Subsidiary is joining the Collateral Agreement as a Grantor, and as security for the indefeasible payment in full and performance, of the Secured Obligations, the New Subsidiary hereby pledges, hypothecates, assigns, charges, mortgages, delivers and transfers to the Collateral Agent, its successors and assigns, for the ratable benefit of the Secured Parties, and hereby grants to the Collateral Agent, its successors and assigns, for the ratable benefit of the Secured Parties, a continuing Security Interest in all right, title and interest in, to and under any and all of its Property constituting Article 9 Collateral now owned or at any time hereafter acquired by the New Subsidiary or in which the New Subsidiary now has or at any time in the future may acquire any right, title or interest. SECTION 4. Each reference to an “Obligor”, a “Guarantor”, a “Subsidiary Guarantor”, a “Pledgor”, or a “Grantor” in the Collateral Agreement shall be deemed to include the New Subsidiary to the extent the New Subsidiary is joining the Collateral Agreement in such capacity, as indicated on the signature page hereto (or if no such indication is made, then in each such capacity). The Collateral Agreement is hereby incorporated herein by reference. SECTION 5. The New Subsidiary represents and warrants to the Collateral Agent and the other Secured Parties that this Supplement has been duly authorized, executed and delivered by it and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, subject to (i) the effects of bankruptcy, insolvency, moratorium, reorganization, fraudulent conveyance or other similar laws affecting creditors’ rights generally, (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law) and (iii) implied covenants of good faith and fair dealing. SECTION 6. This Supplement may be executed in one or more counterparts, each of which shall constitute an original but all of which when taken together shall constitute but one contract. This Supplement shall become effective when (a) the Collateral Agent shall have received a counterpart of this Supplement that bears the signature of the New Subsidiary and (b) the Collateral Agent has executed a counterpart hereof. Delivery of an executed counterpart to this Supplement by facsimile or an electronic transmission of a PDF copy thereof shall be as effective as delivery of a manually signed original. Any such delivery shall be followed promptly by delivery of the manually signed original. SECTION 7. The New Subsidiary has delivered a Perfection Certificate to the Collateral Agent. The information set forth therein (including the schedules attached thereto) is correct and complete as of the date hereof. SECTION 8. Except as expressly supplemented hereby, the Collateral Agreement shall remain in full force and effect. SECTION 9. THIS SUPPLEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS SUPPLEMENT WITHOUT GIVING EFFECT TO CONFLICT OF LAWS AND PRINCIPLES SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

Exhibit I – Page 3 SECTION 10. In the event any one or more of the provisions contained in this Supplement should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and in the Collateral Agreement shall not in any way be affected or impaired thereby. The parties shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions. SECTION 11. All communications and notices hereunder shall be in writing and given as provided in Section 6.01 of the Collateral Agreement. SECTION 12. Without in any way limiting the indemnification and expenses provisions of the Collateral Agreement that have been incorporated herein by reference, the New Subsidiary agrees to reimburse the Collateral Agent for its reasonable and documented out-of-pocket expenses in connection with this Supplement, including the reasonable and documented fees, disbursements and other charges of counsel for the Collateral Agent. [Signatures begin on following page]

Exhibit I – Page 4 IN WITNESS WHEREOF, the New Subsidiary and the Collateral Agent have duly executed this Supplement to the Collateral Agreement as of the day and year first above written. [Insert Company Name], as New Subsidiary, in its capacity as a Pledgor and a Grantor By: ______________________________ Name: Title:

Exhibit I – Page 5 REGIONS BANK, as Collateral Agent By: ______________________________ Name: Title: