Dallas, Texas (September 20, 2012) – Summit Midstream Partners, LP (the “Partnership”), a Delaware limited partnership, announced today that it has commenced an initial public offering of 12,500,000 common units representing limited partner interests in the Partnership pursuant to a registration statement on Form S-1 previously filed with the U.S. Securities and Exchange Commission (“SEC”). The underwriters will be granted a 30-day option to purchase up to an additional 1,875,000 common units. The common units will be listed on the New York Stock Exchange and traded under the symbol “SMLP”.

The common units being offered to the public represent a 25.1% limited partner interest in the Partnership, or a 28.9% limited partner interest if the underwriters exercise, in full, their option to purchase additional common units. Summit Midstream Partners, LLC will hold a 2% general partner interest and a 72.9% limited partner interest in the Partnership, or a 69.1% limited partner interest if the underwriters exercise, in full, their option to purchase additional common units. Barclays, BofA Merrill Lynch, Morgan Stanley and Goldman, Sachs & Co. are acting as joint book-running managers for the offering; BMO Capital Markets, Deutsche Bank Securities, RBC Capital Markets, Robert W. Baird & Co., and Janney Montgomery Scott are acting as co-managers for the offering.

This offering of common units will be made only by means of a prospectus. When available, a written prospectus, which meets the requirements of Section 10 of the Securities Act of 1933, may be obtained from the offices of:

Barclays Capital Inc.
c/o Broadridge Financial Solutions
1155 Long Island Avenue Edgewood, NY 11717

BofA Merrill Lynch
Attn: Prospectus Department
222 Broadway, 7th Floor New York, NY 10038
dg.prospectus requests@baml.com

Morgan Stanley
Attention: Prospectus Department
180 Varick Street, 2nd Floor
New York, NY 10014

Goldman, Sachs & Co.
Attention: Prospectus Department
200 West Street
New York, NY 10282

A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. The registration statement is available on the SEC’s website at www.sec.gov under the registrant’s name, “Summit Midstream Partners, LP”. This press release shall not constitute an offer to sell or the solicitation of an offer to buy the securities described above, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or

About Summit Midstream Partners, LP
Summit Midstream Partners, LP is a growth-oriented limited partnership focused on owning and operating midstream energy infrastructure that is strategically located in the core producing areas of unconventional resource basins, primarily shale formations, in North America. The Partnership currently provides fee-based natural gas gathering and compression services in two unconventional resource basins:
(i) the Piceance Basin, which includes the Mesaverde, Mancos and Niobrara Shale formations in western Colorado; and (ii) the Fort Worth Basin, which includes the Barnett Shale formation in north-central Texas. The Partnership owns and operates approximately 385 miles of pipeline and 147,600 horsepower of compression. The Partnership is headquartered in Dallas, TX with offices in Houston, TX, Denver, CO and Atlanta, GA.

Summit Midstream Partners, LP Marc Stratton
Vice President & Treasurer 214-242-1966