X0306 4 2019-08-02 0001362705 Sanchez Midstream Partners LP SNMP 0001656530 Stonepeak Catarina Holdings LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656529 Stonepeak Catarina Upper Holdings LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656528 Stonepeak Infrastructure Fund (Orion AIV) LP 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656527 Stonepeak Associates LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656526 Stonepeak GP Holdings LP 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656525 Stonepeak GP Investors LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001656524 Stonepeak GP Investors Manager LLC 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001550758 Dorrell Michael B. 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks 0001550764 Vichie Trent D 55 HUDSON YARDS 550 W. 34TH STREET, 48TH FLOOR NEW YORK NY 10001 true true See Remarks Class C Preferred Units 2019-08-02 4 A 0 31310896 A 31310896 D Class B Preferred Units 2019-08-02 4 D 0 31310896 D Common Units 31310896 0 D Warrant 0 2019-08-02 4 A 0 1918809 A Common Units 1918809 1918809 D The Class B Preferred Units were convertible into Common Units at any time, at the holder's election, subject to the requirement to convert a minimum of $17.5 million of Class B Preferred Units. Each Preferred Unit was convertible into one Common Unit. The Class B Preferred Units had no expiration date. On August 2, 2019, Stonepeak Catarina Holdings LLC exchanged all of the issued and outstanding Class B Preferred Units for newly issued Class C Preferred Units of the Issuer (the "Class C Preferred Units") and a warrant exercisable for Junior Securities (as defined in the Third Amended and Restated Agreement of Limited Partnership of the Issuer filed as Exhibit 3.1 to the current report on Form 8-K filed by the Issuer on August 5, 2019) (the "Warrant") in a privately negotiated transaction. The Class C Preferred Units have the same voting rights as the holders of the Common Units but are not convertible into Common Units. The Issuer's board of directors approved each transaction in a manner consistent with Rule 16b-3 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). No additional monetary consideration was paid by or to Stonepeak Catarina Holdings LLC in connection with these transactions. The Warrant may be exercised at any time and from time to time during the period beginning on August 2, 2019 and ending on the later of the seventh anniversary of such date and the date thirty days after the date on which all of the Class C Preferred Units have been redeemed for a number of Junior Securities (which includes equity interests of the Issuer and its general partner that rank junior to the Class C Preferred Units, including, but not limited to, Common Units) equal to 10% of the then-outstanding applicable class of Junior Securities as of the exercise date. No purchase price will be payable in connection with the exercise of the Warrant These Preferred Units and Warrants are owned directly by Stonepeak Catarina Holdings LLC, and indirectly by Stonepeak Catarina Upper Holdings LLC, Stonepeak Infrastructure Fund (Orion AIV) LP, Stonepeak Associates LLC, Stonepeak GP Holdings LP, Stonepeak GP Investors LLC, Stonepeak GP Investors Manager LLC, Michael Dorrell and Trent Vichie. Stonepeak Catarina Upper Holdings LLC is the managing member of Stonepeak Catarina Holdings LLC. 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. Each Reporting Person disclaims beneficial ownership of the Preferred 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 Preferred Units for purposes of Section 16 of the Exchange Act, or for any other purpose. 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. /s/ Michael Dorrell 2019-08-06 /s/ Trent Vichie 2019-08-06