TTI TETRA Technologies

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 * SERRANO ELIJIO V	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) Sr. Vice President & CFO
(Last)          (First)          (Middle) 24955 INTERSTATE 45 NORTH	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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	8/25/2021		M(1)		34080.00	A	$0.00 (1)	760614.00	D
Common Stock	8/25/2021		F(2)		13411.00	D	$2.87	747203.00	D
Common Stock	8/25/2021		M(3)		35473.00	A	$0.00 (3)	782676.00	D
Common Stock	8/25/2021		F(4)		13959.00	D	$2.87	768717.00	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	$0.00 (5)	8/25/2021		M (3)			35473.00	(5)	(5)	Common Stock	35473.00	$0.00 (3)	106419.00	D
Restricted Stock Units	$0.00 (6)	8/25/2021		M (1)			34080.00	(6)	(6)	Common Stock	34080.00	$0.00 (1)	34080.00	D

Explanation of Responses:
(1)	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.
(2)	Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the restricted stock unit granted on February 21, 2019.
(3)	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.
(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
	Director	10% Owner	Officer	Other
SERRANO ELIJIO V 24955 INTERSTATE 45 NORTH THE WOODLANDS, TX 77380			Sr. Vice President & CFO

Signatures
Kimberly M. O'Brien, attorney in fact		8/27/2021
**Signature of Reporting Person		Date