X0407 5 2022-12-31 0 0 0 0001549922 Summit Midstream Partners, LP SMLP 0001237636 PETERS JERRY L C/O SUMMIT MIDSTREAM PARTNERS, LP 910 LOUISIANA STREET, SUITE 4200 HOUSTON TX 77002 1 0 0 1 See Remarks. 0 Common Units (Limited Partner Interests) 2020-11-02 5 G 0 L 212960 0.00 D 0 D Common Units (Limited Partner Interests) 2021-05-11 5 G 0 L 6667 0.00 D 0 D Common Units (Limited Partner Interests) 2022-09-16 5 G 0 L 6444 0.00 D 0 D Common Units (Limited Partner Interests) 33658 I By Joint Spousal Trust On November 9, 2020, the Issuer effected a 1-for-15 reverse stock split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992. On November 2, 2020, the Reporting Person transferred 212,960 common units to the Joint Spousal Trust of which the Reporting Person is a trustee. The Reporting Person and his spouse are the sole beneficiaries of the Joint Spousal Trust. On May 11, 2021, the Reporting Person transferred 6,667 common units to the Joint Spousal Trust. On September 16, 2022, the Reporting Person transferred 6,444 common units to the Joint Spousal Trust. This total reflects the total common units the Reporting Person indirectly owns after giving effect to (1) a series of transfers reported in this Form 5, and (2) the transfer by the Reporting Person on April 18, 2023 of 6,350 common units to the Joint Spousal Trust, which were separately reported on a Form 4 filed April 21, 2023. The Reporting Person is a director of Summit Midstream GP, LLC, the general partner of the Issuer (the "General Partner"). The Issuer is managed by the directors and executive officers of the General Partner. /s/ James D. Johnston, Attorney-in-Fact for Jerry L. Peters 2023-04-21