FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

ENERGY CAPITAL PARTNERS II, LLC 		2. Issuer Name and Ticker or Trading Symbol

Summit Midstream Partners, LP [ SMLP ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
See Footnotes
(Last)          (First)          (Middle)

51 JOHN F. KENNEDY PARKWAY, SUITE 1250 		3. Date of Earliest Transaction (MM/DD/YYYY)

2/3/2017
(Street)

SHORT HILLS, NJ 07078
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
COMMON UNITS (LIMITED PARTNER INTERESTS)   2/3/2017     S    4000000   D $24.00   (1) 25854581   I   (2) (3) BY: SUMMIT MIDSTREAM PARTNERS HOLDINGS, LLC  
COMMON UNITS (LIMITED PARTNER INTERESTS)                  5915827   I   (2) (3) BY: SMLP HOLDINGS, LLC  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
( 1)  On February 3, 2017, Summit Midstream Partners Holdings, LLC ("SMPH") sold 4,000,000 common units representing limited partner interests in the Issuer to the underwriters in a public offering.
( 2)  Energy Capital Partners II, LP ("ECP II") and certain of its parallel funds (collectively, the "SMLP Holdings Owners") collectively hold all of the membership interests in SMLP Holdings, LLC(''SMLP Holdings''). Energy Capital Partners II, LLC (''ECP'') indirectly controls the SMLP Holdings Owners. Accordingly, ECP and the SMLP Holdings Owners may be deemed to indirectly beneficially own the 5,915,827 common units held by SMLP Holdings but disclaim beneficial ownership except to the extent of their pecuniary interest therein.
( 3)  ECP indirectly controls ECP II, Energy Capital Partners II-A, LP (''ECP II-A''), Energy Capital Partners II-B IP, LP (''ECP II-B''), Energy Capital Partners II-C (Summit IP), LP (''ECP II-C'') and Energy Capital Partners II (Summit Co-Invest), LP ("ECP Summit Co-Invest" and together with ECP II, ECP II-A, ECP II-B and ECP II-C, the ''ECP Funds''), which collectively hold more than a majority of the membership interests in Summit Midstream Partners, LLC ("Summit") and are entitled to appoint all the directors of Summit. Summit is the sole member of SMPH and may be deemed to have indirect beneficial ownership of the 25,854,581 common units held by SMPH. Accordingly, ECP and the ECP Funds may be deemed to indirectly beneficially own the 25,854,581 common units held by SMPH but disclaim beneficial ownership except to the extent of their pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
ENERGY CAPITAL PARTNERS II, LLC
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078 		X X
See Footnotes
ENERGY CAPITAL PARTNERS II, LP
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078
X

ENERGY CAPITAL PARTNERS II-A, LP
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078
X

ENERGY CAPITAL PARTNERS II-B IP, LP
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078
X

ENERGY CAPITAL PARTNERS II-C (SUMMIT IP), LP
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078
X

Energy Capital Partners II (Summit Co-Invest), LP
51 JOHN F. KENNEDY PARKWAY
SUITE 1250
SHORT HILLS, NJ 07078
X


Signatures
Energy Capital Partners II, LP By: Energy Capital Partners GP II, LP Its: General Partner By: Energy Capital Partners II, LLC Its: General Partner By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date

Energy Capital Partners II-A, LP By: Energy Capital Partners GP II, LP Its: General Partner By: Energy Capital Partners II, LLC Its: General Partner By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date

Energy Capital Partners II-B IP, LP By: Energy Capital Partners GP II, LP Its: General Partner By: Energy Capital Partners II, LLC Its: General Partner By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date

Energy Capital Partners II-C (Summit IP), LP By: Energy Capital Partners GP II, LP Its: General Partner By: Energy Capital Partners II, LLC Its: General Partner By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date

Energy Capital Partners II (Summit Co-Invest), LP By: Energy Capital Partners GP II Co-Investment (Summit), LLC Its: General Partner By: Energy Capital Partners II, LLC Its: Managing Member By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date

Energy Capital Partners II, LLC By: /s/ Enoch O. Varner Title: Counsel 2/7/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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