shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

Regulation FD Disclosure. On June 1, 2026, Summit Midstream Corporation (the “Company”) issued a press release announcing an inaugural stock repurchase program to repurchase up to $35.0 million of the Company’s outstanding common stock, par value $0.01 per share. The full text of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 7.01, including Exhibit 99.1, is being furnished and shall not be…

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

Entry into a Material Definitive Agreement. On March 31, 2026, Summit Midstream Corporation, a Delaware corporation (the “Company”), entered into a Securities Purchase Agreement (the “Purchase Agreement”), by and among the Company, Summit Midstream Partners, LP, a Delaware limited partnership (the “Partnership”), and Tall Oak Midstream Holdings, LLC, a Delaware limited liability company (the “Tall Oak Midstream Holdings”), and solely for purposes of modifying certain existing registration rig…

by reference. The Shares were issued in reliance on the exemption from registration requirements under the Securities Act, pursuant to Section 4(a)(2) thereof.

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

Director — Marguerite Woung-Chapman: Ms. Marguerite Woung-Chapman is retiring and will be succeeded by Carolyn J. Stone.

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

The filing describes updates to compensation arrangements for certain officers, which does not constitute a management change.

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

On the Closing Date, as a result of the consummation of the Transaction and on the terms and pursuant to the conditions contained in the Purchase Agreement, the Buyer purchased all of the issued and outstanding equity interests of the Acquired Company. The aggregate consideration provided to the Seller upon the closing of the Transaction was $90,000,000, which consideration consisted of (i) $70,000,000 in cash consideration, subject to certain customary purchase price adjustments set forth in…

The issuance of the Issued Shares did not involve a public offering and was exempt from the registration requirements of the Securities Act pursuant to Section 4(a)(2) of the Securities Act. The Issued Shares have not been registered under the Securities Act or applicable state securities laws and may not be offered or sold in the United States absent registration under the Securities Act or an exemption from such registration requirements.

Entry into a Material Definitive Agreement. Membership Interest Purchase Agreement On March 10, 2025 (the “Closing Date”), Summit Midstream Corporation, a Delaware corporation (the “Company”), entered into a Membership Interest Purchase Agreement (the “Purchase Agreement”), by and among the Company, Fundare Resources Company HoldCo, LLC, a Delaware limited liability company (the “Seller”), Summit Midstream Holdings, LLC, a Delaware limited liability company (the “Buyer”), and, solely for purp…

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

Other Events. Notes Offering On January 7, 2025, Summit Midstream Corporation, a Delaware corporation (the “Company”), issued a press release announcing that, subject to market and other conditions, Summit Midstream Holdings, LLC (the “Issuer”), a subsidiary of the Company, intends to offer for sale $250.0 million in aggregate principal amount of additional 8.625% Senior Secured Second Lien Notes due 2029 (the “Additional Notes”) in a private offering to eligible purchasers that is exempt fro…

Entry into a Material Definitive Agreement. Second Supplemental Indenture On December 4, 2024, subsequent to completion of the Transaction, Summit Midstream Holdings, LLC, a Delaware limited liability company (the “Issuer”), Tall Oak, Tall Oak Woodford, LLC, a Delaware limited liability company and a direct, wholly-owned subsidiary of Tall Oak (“Woodford”), VM ARKOMA Stack, LLC, a Delaware limited liability company and a direct, wholly-owned subsidiary of Tall Oak (“Arkoma”), BCZ Land Holding…

Entry Into a Material Definitive Agreement. On December 2, 2024 (the “Closing Date”), Summit Midstream Corporation, a Delaware corporation (the “Company”), consummated the previously announced transaction (the “Transaction”) contemplated by that certain Business Contribution Agreement, dated as of October 1, 2024 (the “Business Contribution Agreement”), by and among the Company, Summit Midstream Partners, LP (the “Partnership”) and Tall Oak Midstream Holdings, LLC (“Tall Oak”). On the Closing…

Director — Jason Downie, Edward Herring, Stephen Lipscomb and Drew Winston: Four new directors were appointed to the Board as part of a significant corporate transaction.

by reference. Such issuances of the Securities did not involve public offerings and were exempt from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”), pursuant to Section 4(a)(2) of the Securities Act.

On the Closing Date, as a result of the consummation of the Transaction and on the terms and pursuant to the conditions contained in the Business Contribution Agreement, the Partnership received all of the issued and outstanding equity interest of Tall Oak Opco from Tall Oak. The aggregate consideration for the Transaction was $155 million in cash consideration, the Securities, and up to $25 million contingent consideration in cash over certain measurement periods through March 31, 2026. The…

shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such document.

Material Definitive Agreement. On October 1, 2024, Summit Midstream Corporation, a Delaware corporation (the “Company”), entered into a Business Contribution Agreement (the “Business Contribution Agreement”), by and among the Company, Summit Midstream Partners, LP, a Delaware limited partnership (the “Partnership”), and Tall Oak Midstream Holdings, LLC, a Delaware limited liability company (“Tall Oak Parent”), pursuant to which, among other things, upon the satisfaction of the terms and condi…

by reference. The Company intends to issue the Class B Common Stock and Partnership Units to Tall Oak Parent in reliance on the exemption from registration requirements under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to Section 4(a)(2) thereof.

Results of Operations and Financial Condition. On August 8, 2024 , Summit Midstream Corporation (NYSE: SMC), a Delaware corporation (the “Company”) issued a press release announcing the results of operations of Summit Midstream Partners, LP, a Delaware limited partnership and a wholly-owned subsidiary of the Company, for the three months ended June 30, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information furnished in this