[Form 4] TETRA TECH INC Insider Trading Activity

Rhea-AI Filing Summary

Tetra Tech, Inc. reported insider equity transactions by Chairman and CEO Dan L. Batrack. On November 18, 2025, he exercised restricted stock units (RSUs) into 14,030 and 19,015 shares of common stock at $0 per share and acquired 164,285 additional shares from vesting of performance stock units under the 2018 Equity Incentive Plan. Shares totaling 18,235 and 90,653 were withheld at a price of $35.69 per share to cover related tax liabilities. After these transactions, he directly owned 314,309 shares of Tetra Tech common stock and 19,010 RSUs, which each represent the right to receive one share upon vesting.

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

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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^*

BATRACK DAN 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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman and CEO

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		14,030	A	$0	239,897(1)	D
COMMON STOCK	11/18/2025		M		19,015	A	$0	258,912	D
COMMON STOCK	11/18/2025		F		18,235(2)	D	$35.69	240,677	D
COMMON STOCK	11/18/2025		A		164,285(3)	A	$0	404,962	D
COMMON STOCK	11/18/2025		F		90,653(4)	D	$35.69	314,309	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			14,030	11/18/2022(6)	(7)	COMMON STOCK	14,030	$0	0	D
RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	(5)	11/18/2025		M			19,015	11/18/2023(8)	(7)	COMMON STOCK	19,015	$0	19,010	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 Dan L. Batrack	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 transactions were reported for Tetra Tech (TTEK)?

The Chairman and CEO, Dan L. Batrack, reported multiple equity transactions on November 18, 2025, including RSU exercises, performance stock unit vesting, and share withholding to cover tax liabilities.

How many Tetra Tech (TTEK) shares did the CEO acquire or vest on November 18, 2025?

He acquired common stock from RSU exercises of 14,030 and 19,015 shares, and an additional 164,285 shares from vesting of performance stock units.

How many Tetra Tech (TTEK) shares were withheld for taxes in this Form 4?

The filing states that 18,235 shares and 90,653 shares of common stock were withheld at $35.69 per share to pay related tax liabilities on vested RSUs and performance stock units.

What is Dan L. Batrack’s Tetra Tech (TTEK) share ownership after the reported transactions?

Following the transactions, he directly owned 314,309 shares of Tetra Tech common stock.

How many restricted stock units (RSUs) does the Tetra Tech (TTEK) CEO hold after these transactions?

After the reported activity, he beneficially owned 19,010 restricted stock units, each representing the right to receive one share of Tetra Tech common stock.

How do the Tetra Tech (TTEK) RSUs vest for the CEO?

One RSU award vests as to 25% of the shares on November 18, 2022 and annually thereafter until fully vested, and another vests 25% on November 18, 2023 and 25% annually thereafter until fully vested.

What plan governs the performance stock units reported for Tetra Tech (TTEK)?

The performance stock units that vested into 164,285 common shares were earned under Tetra Tech’s 2018 Equity Incentive Plan.