[Form 4] TETRA TECH INC Insider Trading Activity

Rhea-AI Filing Summary

Tetra Tech (TTEK) executive Leslie L. Shoemaker, EVP and Chief Sustainability Officer, reported multiple equity transactions on 11/18/2025. The filing shows the exercise of restricted stock units (RSUs) for 2,520 and 3,170 shares of common stock at $0 per share, reflecting previously granted awards. It also reports tax-withholding transactions, where 3,141 and 15,112 shares were withheld at a price of $35.69 to cover related tax liabilities.

In addition, 27,384 shares were acquired upon vesting of performance stock units earned under the 2018 Equity Incentive Plan. After these transactions, Shoemaker beneficially owned 322,811 shares of Tetra Tech common stock in direct ownership. The filing also notes an earlier acquisition of 149 shares through the Employee Stock Purchase Plan on December 15, 2024, and describes RSU vesting schedules that vest in 25% annual installments.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SHOEMAKER LESLIE L

(Last) (First) (Middle)

3475 EAST FOOTHILL BOULEVARD

(Street)

PASADENA CA 91107

(City) (State) (Zip)

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)
	EVP, Chief Sustainability

3. Date of Earliest Transaction (Month/Day/Year)
11/18/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	11/18/2025		M		2,520	A	$0	310,510(1)	D
COMMON STOCK	11/18/2025		M		3,170	A	$0	313,680	D
COMMON STOCK	11/18/2025		F		3,141(2)	D	$35.69	310,539	D
COMMON STOCK	11/18/2025		A		27,384(3)	A	$0	337,923	D
COMMON STOCK	11/18/2025		F		15,112(4)	D	$35.69	322,811	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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: 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 (RIGHT TO RECEIVE)	(5)	11/18/2025		M			2,520	11/18/2022(6)	(7)	COMMON STOCK	2,520	$0	0	D
RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	(5)	11/18/2025		M			3,170	11/18/2023(8)	(7)	COMMON STOCK	3,170	$0	3,165	D

Explanation of Responses:

1. Amount of securities beneficially owned was updated to reflect that 149 shares of common stock were acquired by the Reporting Person on December 15, 2024, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP).

2. Represents the shares withheld to pay the related tax liability of the restricted stock units (RSUs) that vested on November 18, 2025.

3. Shares acquired pursuant to vesting of performance stock units earned under 2018 Equity Incentive Plan.

4. Represents the shares withheld to pay the related tax liability of performance stock units that vested on November 18, 2025.

5. Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock.

6. The RSUs become vested as to 25% of the shares on November 18, 2022, and 25% annually, thereafter, until fully vested.

7. The RSUs are exercisable at the time of vesting and do not have a set expiration date.

8. The RSUs become vested as to 25% of the shares on November 18, 2023, and 25% annually, thereafter, until fully vested.

Remarks:

	/s/ Preston Hopson, Attorney-in-fact for Leslie L. Shoemaker	11/20/2025
	** Signature of Reporting Person	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.

FAQ

What insider transaction did Tetra Tech (TTEK) report for Leslie L. Shoemaker?

The Form 4 reports that Leslie L. Shoemaker, EVP and Chief Sustainability Officer of Tetra Tech (TTEK), completed several equity transactions on 11/18/2025, including RSU exercises, performance stock unit vesting, and share withholdings for taxes.

How many Tetra Tech (TTEK) shares does Leslie L. Shoemaker own after the reported transactions?

Following the reported transactions on 11/18/2025, Leslie L. Shoemaker beneficially owned 322,811 shares of Tetra Tech common stock in direct ownership.

What RSU-related transactions were disclosed for Tetra Tech (TTEK) on 11/18/2025?

The filing shows RSU exercises for 2,520 and 3,170 shares of Tetra Tech common stock at $0 per share, with related tax-withholding sales of 3,141 and 15,112 shares at $35.69 to cover tax liabilities on the vesting RSUs and performance stock units.

What performance stock unit activity did Tetra Tech (TTEK) report for Leslie L. Shoemaker?

The Form 4 states that 27,384 shares of Tetra Tech common stock were acquired on 11/18/2025 pursuant to the vesting of performance stock units earned under the company’s 2018 Equity Incentive Plan.

How do the restricted stock units (RSUs) for Tetra Tech (TTEK) vest for Leslie L. Shoemaker?

According to the filing, the RSUs vest as to 25% of the shares on November 18, 2022 and November 18, 2023, respectively, and then 25% annually thereafter until fully vested. The RSUs are exercisable at the time of vesting and do not have a set expiration date.

Did the Form 4 for Tetra Tech (TTEK) include any Employee Stock Purchase Plan activity?

Yes. The explanation notes that the amount of securities beneficially owned was updated to include 149 shares of Tetra Tech common stock acquired by Leslie L. Shoemaker on December 15, 2024 under the company’s Employee Stock Purchase Plan.