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 *

CHRISTENSEN CRAIG L
2. Issuer Name and Ticker or Trading Symbol

TETRA TECH INC [ TTEK ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
SVP, CIO
(Last)          (First)          (Middle)

3475 EAST FOOTHILL BOULEVARD
3. Date of Earliest Transaction (MM/DD/YYYY)

9/3/2021
(Street)

PASADENA,, CA 91107
(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 9/3/2021  G  300 D$0 (1)33439 D  
COMMON STOCK 9/3/2021  M  4756 A$27.26 38195 D  
COMMON STOCK 9/3/2021  S  4756 D$150.9021 (2)33439 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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
STOCK OPTION (RIGHT TO BUY) $27.26 9/3/2021  M     4756  11/21/2015 (3)11/21/2022 (4)COMMON STOCK 4756.0 $0 0 D  

Explanation of Responses:
(1) Bona fide gift. No compensation was given to the donor for the gifting of shares.
(2) $150.9021 is an average price. Shares were sold at prices ranging from $150.90 to $151.00 per share.
(3) The option becomes exercisable as to 25% of the shares on each anniversary of the grant date.
(4) The option granted expires 8 years after the grant date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
CHRISTENSEN CRAIG L
3475 EAST FOOTHILL BOULEVARD
PASADENA,, CA 91107


SVP, CIO

Signatures
/s/ Preston Hopson, Attorney-in-fact for Craig L. Christensen9/3/2021
**Signature of Reporting PersonDate

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