Sec Form 4 Filing - Lou Michael H @ Oasis Midstream Partners LP - 2022-02-01

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Lou Michael H 2. Issuer Name and Ticker or Trading Symbol Oasis Midstream Partners LP [ OMP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President (Last) (First) (Middle) 1001 FANNIN STREET, SUITE 1500 3. Date of Earliest Transaction (MM/DD/YY) 02/01/2022 (Street) HOUSTON, TX77002 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 representing limited partner interests 02/01/2022 D 45,712 D $ 27.48( 1 ) 0 D

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 Phantom Units( 2 ) ( 2 ) ( 3 ) ( 3 ) Common units representing limited partnership interests ( 2 ) 4,240( 3 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lou Michael H 1001 FANNIN STREET, SUITE 1500 HOUSTON, TX77002 X President Signatures /s/ Nickolas J. Lorentzatos, attorney-in-fact 02/03/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On February 1, 2022, pursuant to that certain Agreement and Plan of Merger, dated as of October 25, 2021 (the "Merger Agreement"), by and among Oasis Midstream Partners LP ("OMP"), OMP GP LLC, Crestwood Equity Partners LP ("Crestwood"), Project Phantom Merger Sub LLC, Project Falcon Merger Sub LLC and Crestwood Equity GP LLC, (i) each common unit representing limited partner interests in OMP (other than the Sponsor Units (as defined in the Merger Agreement)) issued and outstanding immediately prior to the Effective Time (as defined in the Merger Agreement) was converted into the right to receive 0.8700 common units representing limited partner interests in Crestwood ("Crestwood Common Units"). On January 31, 2022 (the last trading day prior to the Effective Time), the closing price of the Crestwood Common Units was $27.48. ( 2 )An award of Phantom Units that was granted to the Reporting Person by our sponsor, Oasis Petroleum Inc. While the Phantom Units were granted by Oasis Petroleum Inc., each Phantom Unit represents the right to receive, upon vesting, a cash payment equal to the fair market value of one common unit representing a limited partner interest of OMP. Oasis Petroleum Inc. is solely responsible for any payments attributable to the Phantom Units. Since the Phantom Units were granted by Oasis Petroleum Inc., such Phantom Units will remain outstanding following the Effective Time. ( 3 )The award of Phantom Units was originally granted to the Reporting Person on January 17, 2019 and was scheduled to vest in three equal installments. One-third of the award vested in each of 2020 and 2021. The final one-third of the award, consisting of the number of Phantom Units indicated, is eligible to vest in 2022. Modifications, if any, to be made to the award of Phantom Units following the Effective Time to give effect to the transactions contemplated by the Merger Agreement will be determined by Oasis Petroleum Inc. in its sole discretion.

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 Number.