Summit Midstream Partners, LP (NYSE: SMLP) (the "Partnership") announced today the preliminary results of its offer to exchange (the "Exchange Offer") any and all of its 9.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (Liquidation Preference $1,000) (the "Series A Preferred Units") tendered in the Exchange Offer for newly issued common units representing limited partner interests in the Partnership (the "Common Units"), which expired at 11:59 p.m., New York City time, on January 12, 2022 (the "Expiration Date"). Based on preliminary information provided by American Stock Transfer & Trust Company, LLC, the depositary of the Exchange Offer (the "Depositary"), as of the Expiration Date, 77,939 Series A Preferred Units had been properly tendered (and not validly withdrawn). The number of Series A Preferred Units properly tendered (and not validly withdrawn) is preliminary and is subject to verification by the Depositary. The Partnership expects to deliver the Common Units to be issued in exchange for the Series A Preferred Units on January 14, 2022.