Sec Form 4 Filing - Stonepeak Catarina Holdings LLC @ Sanchez Midstream Partners LP - 2020-09-07

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Stonepeak Catarina Holdings LLC 2. Issuer Name and Ticker or Trading Symbol Sanchez Midstream Partners LP [ SNMP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) See Remarks (Last) (First) (Middle) 55 HUDSON YARDS, 550 W. 34TH STREET, 48TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 09/07/2020 (Street) NEW YORK, NY10001 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 09/07/2020 P 4,650,439 ( 1 ) A 4,650,439 I ( 4 ) ( 5 ) ( 6 ) See Footnotes ( 4 ) ( 5 ) ( 6 ) Common Units 393,291 D ( 5 ) ( 6 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Stonepeak Catarina Holdings LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak Catarina Upper Holdings LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak Infrastructure Fund (Orion AIV) LP 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak Associates LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak GP Holdings LP 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak GP Investors LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Stonepeak GP Investors Manager LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Dorrell Michael B. 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Vichie Trent D 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK, NY10001 X See Remarks Signatures /s/ Michael Dorrell 09/09/2020 Signature of Reporting Person Date /s/ Trent Vichie 09/09/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This amount includes 140,647 Common Units that are subject to vesting ( 2 )On September 7, 2020, each of Stonepeak Catarina Holdings LLC ("Stonepeak Catarina"), SP Capital Holdings, LLC ("SP Capital") and SP Common Equity LLC ("SPCE") entered into a Contribution and Exchange Agreement (the "Agreement"), pursuant to which Stonepeak Catarina issued (i) to SP Capital 10,000 Class B Units in Stonepeak Catarina in exchange for SP Capital contributing to Stonepeak Catarina 100% of the membership interests in SP Holdings, LLC, the sole member of Sanchez Midstream Partners GP LLC, the general partner of the Issuer, and (ii) to SPCE 5,000 Class C Units in Stonepeak Catarina in exchange for SPCE contributing to Stonepeak Catarina 100% of the membership interests in SP Common Equity Subsidiary LLC ("SPCE Sub") (the "Transaction"). ( 3 )In connection with the Transaction, Antonio R. Sanchez, Jr. and certain affiliates of Antonio R. Sanchez, Jr. irrevocably committed to contribute 4,650,439 Common Units to SPCE Sub as partial consideration for units representing membership interests in SPCE. This amount includes 140,647 Common Units that are subject to vesting. Upon completion of this contribution, Stonepeak Catarina will become the sole member of SPCE Sub and will exercise voting and dispositive power over all of the Common Units held by SPCE Sub; however, SP Capital and SPCE each has the right to certain cash receipts from the Class C Preferred Units and Common Units beneficially owned by Stonepeak Catarina (including Common Units that will be contributed to SPCE Sub). ( 4 )These Common Units have been irrevocably committed to SPCE Sub. Upon completion of this contribution, Stonepeak Catarina will become the sole member of SPCE Sub. ( 5 )Stonepeak Catarina Upper Holdings LLC is the managing member of Stonepeak Catarina. Stonepeak Infrastructure Fund (Orion AIV) LP is the managing member of Stonepeak Catarina Upper Holdings LLC. Stonepeak Associates LLC is the general partner of Stonepeak Infrastructure Fund (Orion AIV) LP. Stonepeak GP Holdings LP is the sole member of Stonepeak Associates LLC. Stonepeak GP Investors LLC is the general partner of Stonepeak GP Holdings LP. Stonepeak GP Investors Manager LLC is the managing member of Stonepeak GP Investors LLC. Each of Michael Dorrell and Trent Vichie serve as a managing member of Stonepeak GP Investors Manager LLC. ( 6 )Each Reporting Person disclaims beneficial ownership of the Common Units except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the Common Units for purposes of Section 16 of the Exchange Act, or for any other purpose.

Remarks: Exhibit 99.1: Additional Signatures.Solely for purposes of Section 16 of the Exchange Act, each of the Reporting Persons may be deemed to be directors-by-deputization by virtue of Stonepeak Catarina Holdings LLC's contractual right to, based on its current ownership, designate two persons to serve on the board of directors of the General Partner of the Issuer (the "Board"). Jack Howell and Luke Taylor, each an employee of Stonepeak Catarina Holdings LLC, are members of the Board. In addition, in connection with the Transaction, the Reporting Persons appointed two additional employees - Michael Bricker and John Steen - to serve as members of the Board.

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).

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