Sec Form 4 Filing - Spartan Energy Partners LP @ CSI Compressco LP - 2021-11-18

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 Spartan Energy Partners LP 2. Issuer Name and Ticker or Trading Symbol CSI Compressco LP [ CCLP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 9595 SIX PINES DRIVE #4000 3. Date of Earliest Transaction (MM/DD/YY) 11/18/2021 (Street) THE WOODLANDS, TX77380 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 representing limited partner interests 11/18/2021 A 1,509,436( 1 ) A $ 1.35 52,872,399 D Common units representing limited partner interests 10,952,478 I See footnote( 2 )

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 Spartan Energy Partners LP 9595 SIX PINES DRIVE #4000 THE WOODLANDS, TX77380 X Spartan Energy Partners GP LLC 9595 SIX PINES DRIVE #4000 THE WOODLANDS, TX77380 X Spartan Energy Holdco LLC 9595 SIX PINES DR #4000 THE WOODLANDS, TX77380 X CSI Compressco GP Inc 24955 INTERSTATE 45 N THE WOODLANDS, TX77380 X Signatures SPARTAN ENERGY PARTNERS LP, By: Spartan Energy Partners GP LLC, its general partner, By: /s/ Jonathan W. Byers, Name: Jonathan W. Byers, Title: Secretary 11/22/2021 Signature of Reporting Person Date SPARTAN ENERGY PARTNERS GP LLC, By: /s/ Jonathan W. Byers, Name: Jonathan W. Byers, Title: Secretary 11/22/2021 Signature of Reporting Person Date SPARTAN ENERGY HOLDCO LLC, By: Spartan Energy Partners LP, its sole member, By: Spartan Energy Partners GP LLC, its general partner, By: /s/ Jonathan W. Byers, Name: Jonathan W. Byers, Title: Secretary 11/22/2021 Signature of Reporting Person Date CSI COMPRESSCO GP LLC, By: /s/ Jonathan W. Byers, Name: Jonathan W. Byers, Title: Chief Financial Officer 11/22/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Spartan Energy Partners LP ("Spartan LP") agreed to exchange $2.0 million principal amount of the Issuer's 7.25% senior notes due 2022, which were called for redemption by the Issuer on December 13, 2021, for 1,509,436 common units. ( 2 )Includes (i) 7,463,257 common units held by CSI Compressco GP LLC and (ii) 3,489,221 common units held by CSI Compressco Investment LLC. CSI Compressco GP LLC is the sole member of CSI Compressco Investment LLC. The sole member of CSI Compressco GP LLC is Spartan Energy Holdco, LLC, whose sole member is Spartan Energy Partners LP. As the general partner of Spartan Energy Partners LP, Spartan Energy Partners GP LLC may be deemed to have beneficial ownership of the common units held by Spartan Energy Partners LP. Spartan Energy Partners LP, Spartan Energy Partners GP LLC and Spartan Energy Holdco LLC may be deemed to have beneficial ownership of the common units held by CSI Compressco GP LLC and CSI Compressco Investment LLC.

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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