X0407 4 2023-04-18 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) 2023-04-18 4 G 0 6350 0.00 D 0 D Common Units (Limited Partner Interests) 33658 I By Joint Spousal Trust After giving effect to the transfer reported in this Report, the Reporting Person directly holds an aggregate of 0 common units and indirectly owns 33,658 common units after giving effect to (1) the transfer reported in this Report and (2) a series of transfers, prior to date hereof, where the Reporting Person transferred 27,308 common units between 11/2/2020 and 9/16/2022, in each case, 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. 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