UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): September 23, 2020

Summit Midstream Partners, LP

(Exact name of registrant as specified in its charter)

910 Louisiana Street, Suite 4200

Houston, TX 77002

(Address of principal executive office) (Zip Code)

(Registrant’s telephone number, including area code): (832) 413-4770

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Securities Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

As previously announced, on August 25, 2020, Summit Midstream Holdings, LLC (the “Company”), a Delaware limited liability company, and Summit Midstream Finance Corp., a Delaware corporation (together with the Company, the “Issuers”), both of which are wholly owned subsidiaries of Summit Midstream Partners, LP (the “Partnership”), commenced tender offers (the “Tender Offers”) to purchase for cash a portion of the Issuers’ 5.75% Senior Notes due 2025 (the “2025 Notes”) and 5.50% Senior Notes due 2022 (the “2022 Notes,” and together with the 2025 Notes, the “Notes”) pursuant to the terms and subject to the conditions set forth in the Offer to Purchase, dated August 25, 2020, as amended and supplemented from time to time.

On September 23, 2020, the Partnership issued a press release announcing the expiration and final results of the Tender Offers, which expired at 11:59 p.m., New York City time, on September 22, 2020. As of 11:59 p.m., New York City time, on Tuesday, September 22, 2020, according to information provided by D.F. King & Co., Inc., the Tender and Information Agent for the Tender Offers, approximately $38,694,000 aggregate principal amount of the 2025 Notes were validly tendered and not withdrawn and approximately $33,539,000 aggregate principal amount of the 2022 Notes were validly tendered and not withdrawn.

The Issuers expect to accept for payment all of the Notes that were validly tendered and not validly withdrawn in the Tender Offers and expect to make payment for the Notes on September 24, 2020.

The information furnished in this Item 7.01 shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “1934 Act”), and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission, whether or not filed under the Securities Act of 1933 or the 1934 Act, regardless of any general incorporation language in such document.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.