INTRODUCTORY STATEMENT
This Amendment No. 1 amends and supplements the Tender Offer Statement on Schedule TO originally filed with the Securities and Exchange Commission (the
SEC) on March 10, 2021 by Summit Midstream Partners, LP (the Partnership), in connection with its offer to exchange, on the terms and subject to the conditions set forth in the Offer to Exchange,
dated March 10, 2021 (as it may be supplemented and amended from time to time, the Offer to Exchange), and the related Letter of Transmittal (as it may be supplemented and amended from time to time, the Letter of
Transmittal and, together with the Offer to Exchange, the Offering Documents), the Partnerships 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 up to 2,160,000 newly issued common units (the Maximum Exchange
Amount) representing limited partner interests in the Partnership (the Common Units).
This Amendment No. 1 is being
filed to provide the summarized financial information required by Item 1010(c) of Regulation M-A with respect to the Partnership. Except as specifically provided herein, the information contained in the
Offering Documents remains unchanged by this Amendment No. 1. You should read this Amendment No. 1 together with the Offering Documents.
Item 10. Financial Information.
(a) Financial Information.
The financial
statements and other information set forth under Part II, Item 8 of the Partnerships Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and the summarized financial
information set forth in the section of the Offer to Exchange entitled Summary Consolidated Financial Data are incorporated by reference herein. The full text of such financial statements and other financial information, as well as
the other documents the Company has filed with the SEC prior to, or will file with the SEC subsequent to, the filing of this Schedule TO relating to the Exchange Offer may be accessed electronically on the SECs website at
http://www.sec.gov.
(b) Pro Forma Information.
Not applicable.
Amendments to the Offer to Exchange
1. The Offer to Exchange is hereby amended to add following section titled Summary Consolidated Financial Data after the existing
section of the Offer to Exchange titled Capitalization:
SUMMARY CONSOLIDATED FINANCIAL DATA
In May 2020, the Partnership acquired its General Partner (the GP Buy-In Transaction). In the GP Buy-In Transaction, the Partnership acquired from its then private equity sponsor, Energy Capital Partners (ECP), Summit Midstream Partners, LLC (Summit Investments), which
owned the General Partner through its indirect ownership of Summit Midstream Partners Holdings, LLC. Under generally accepted accounting principles (GAAP), the GP Buy-In Transaction was
deemed a transaction between entities under common control with a change in reporting entity. Although the Partnership is the surviving entity for legal purposes, Summit Investments is the surviving entity for accounting purposes; therefore, the
historical financial results of the Partnership prior to the GP Buy-In Transaction are those of Summit Investments. Prior to the GP Buy-In Transaction, Summit
Investments controlled the Partnership and the Partnerships financial statements were consolidated into Summit Investments.
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