Item 9.01 Financial Statements and Exhibits.

This Amendment No. 1 on Form 8-K/A is being filed by Summit Midstream Partners, LP (including its subsidiaries, collectively "SMLP" or the "Partnership") to amend its current report on Form 8-K filed with the Securities and Exchange Commission on September 20, 2022 (the "Original Report"), solely to provide the pro forma financial information required by Item 9.01 of Form 8-K. Except as otherwise provided herein, the disclosure made in the Original Report remains unchanged.

(b) Pro Forma Financial Information

As previously disclosed, on September 19, 2022, Summit Midstream Holdings, LLC ("SMP Holdings"), a wholly owned subsidiary of the Partnership, completed the sale of Bison Midstream, LLC ("Bison Midstream") to a subsidiary of Steel Reef Infrastructure Corp. ("Steel Reef") for cash consideration of $40.0 million. The sale of Bison Midstream constituted a significant disposition and as a result, the Partnership prepared the accompanying unaudited pro forma condensed consolidated financial statements in accordance with Article 11 of Regulation S-X.

The following unaudited pro forma financial information of the Partnership is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference:

•Unaudited Pro Forma Condensed Consolidated Balance Sheet as of June 30, 2022.

•Unaudited Pro Forma Condensed Consolidated Statement of Operations for the six months ended June 30, 2022.



•Unaudited Pro Forma Condensed Consolidated Statement of Operations for the year
ended December 31, 2021.

(d) Exhibits.

   Exhibit Number                                           Description
        99.1                  Unaudited pro forma condensed consolidated financial information
         104                Cover Page Interactive Data File - the cover page XBRL tags are embedded
                            within the Inline XBRL document

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