Statement of Changes in Beneficial Ownership (4)

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 OF SECURITIES
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^* Moeller Timothy C	2. Issuer Name and Ticker or Trading Symbol TETRA TECHNOLOGIES INC [ TTI ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP - Supply Chain & Chemicals
(Last) (First) (Middle) 24955 INTERSTATE 45 N	3. Date of Earliest Transaction (MM/DD/YYYY) 8/25/2021
(Street) THE WOODLANDS, TX 77380 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	8/25/2021		M⁽¹⁾		8446.00	A	$0.00 ⁽¹⁾	73020.00	D
Common Stock	8/25/2021		M⁽²⁾		4484.00	A	$0.00 ⁽²⁾	77504.00	D
Common Stock	8/25/2021		F⁽³⁾		1092.00	D	$2.87	76412.00	D
Common Stock	8/25/2021		F⁽⁴⁾		2057.00	D	$2.87	74355.00	D

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	$0.00 ⁽⁵⁾	8/25/2021		M ⁽¹⁾			8446.00	⁽⁵⁾	⁽⁵⁾	Common Stock	8446.00	$0.00 ⁽¹⁾	25338.00	D
Restricted Stock Units	$0.00 ⁽⁶⁾	8/25/2021		M ⁽²⁾			4484.00	⁽⁶⁾	⁽⁶⁾	Common Stock	4484.00	$0.00 ⁽²⁾	4485.00	D

Explanation of Responses:
(1)	Represents vested shares of restricted stock units granted on February 20, 2020. Restricted stock units convert into common stock on a one-for-one basis.
(2)	Represents vested shares of restricted stock units granted on February 21, 2019. Restricted stock units convert into common stock on a one-for-one basis.
(3)	Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the restricted stock unit granted on February 21, 2019.
(4)	Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the restricted stock unit granted on February 20, 2020.
(5)	The remaining unvested portion of this restricted stock unit award will vest every six months until fully vested on February 25, 2023. Each restricted stock unit represents the contingent right to receive one share of the Issuer's common stock upon vesting of the unit.
(6)	The remaining unvested portion of this restricted stock unit award will vest every six months until fully vested on February 25, 2022. Each restricted stock unit represents the contingent right to receive one share of the Issuer's common stock upon vesting of the unit.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Moeller Timothy C 24955 INTERSTATE 45 N THE WOODLANDS, TX 77380			SVP - Supply Chain & Chemicals