Sec Form 4 Filing - Mucha Jacek M @ CSI Compressco LP - 2021-01-27

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 Mucha Jacek M 2. Issuer Name and Ticker or Trading Symbol CSI Compressco LP [ CCLP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Treasurer (Last) (First) (Middle) 24955 INTERSTATE 45 N 3. Date of Earliest Transaction (MM/DD/YY) 01/27/2021 (Street) THE WOODLANDS, TX77380 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 01/27/2021 A 556 A $ 0 ( 1 ) 23,328 D Common Units Representing Limited Partner Interests 01/27/2021 F 6,752 D $ 1.23 ( 2 ) 16,576 D Common Units Representing Limited Partner Interests 01/27/2021 F 164 D $ 1.23 ( 3 ) 16,412 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Mucha Jacek M 24955 INTERSTATE 45 N THE WOODLANDS, TX77380 Treasurer Signatures Kimberly M. O'Brien, attorney in fact 01/29/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents dividend equivalent rights accrued on the reporting person's phantom units granted on February 22, 2020 pursuant to the CSI Compressco LP Second Amended and Restated 2011 Long Term Incentive Plan and that were settled proportionately with the award to which they relate. Each dividend equivalent right is the economic equivalent of one Common Unit representing limited partner interests in CSI Compressco LP and may be settled only in Common Units representing limited partner interests in CSI Compressco LP. ( 2 )Reflects shares surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of phantom units in connection with the closing of the transactions contemplated by the Purchase and Sale Agreement between TETRA Technologies, Inc. and Spartan Energy Holdco, LLC, dated as of January 29, 2021. The phantom units were originally granted on February 22, 2020. ( 3 )Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the dividend equivalent rights accrued on the February 22, 2020 phantom unit award.

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).

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