Sec Form 3 Filing - Hudkins Jill @ TETRA TECH INC - 2022-05-02

FORM 3 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Hudkins Jill 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) President, RSI Division (Last) (First) (Middle) 3475 E. FOOTHILL BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 05/02/2022 (Street) PASADENA, CA91107 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 STOCK 4,525 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 RESTRICTED STOCK UNITS $ 0 ( 1 ) ( 2 ) COMMON STOCK 106 D RESTRICTED STOCK UNITS $ 0 ( 3 ) ( 2 ) COMMON STOCK 145 D RESTRICTED STOCK UNITS $ 0 ( 4 ) ( 2 ) COMMON STOCK 461 D RESTRICTED STOCK UNITS $ 0 ( 5 ) ( 2 ) COMMON STOCK 750 D RESTRICTED STOCK UNITS $ 0 ( 6 ) ( 2 ) COMMON STOCK 796 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hudkins Jill 3475 E. FOOTHILL BLVD. PASADENA, CA91107 President, RSI Division Signatures /s/ Preston Hopson, Attorney-in-Fact 05/11/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This RSU award was granted on November 15, 2018 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 106 stock units on November 15, 2022. ( 2 )The RSUs are exercisable at the time of vesting and do not have a set expiration date. ( 3 )This RSU award was granted on November 21, 2019 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 73 stock units on November 21, 2022 and 72 stock units on November 21, 2023. ( 4 )This RSU award was granted on November 19, 2020 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 154 stock units on each November 19 of 2022 through 2023 and 153 stock units on November 19, 2024. ( 5 )This RSU award was granted on April 26, 2021 and vests in four substantially equal installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 250 stock units on each April 26 of 2023 through 2025. ( 6 )This RSU award was granted on November 23, 2021 and vests in four substantially equal installments beginning November 23, 2022, assuming continued employment through the applicable vesting date.

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.