TTEK insider details 21,902 PSU vesting and tax withholdings

Rhea-AI Filing Summary

Tetra Tech (TTEK) executive reports equity award vesting and tax share withholdings. The EVP, Chief Legal/Human Capital filed a Form 4 showing multiple transactions in Tetra Tech common stock and restricted stock units on November 18, 2025.

Two blocks of restricted stock units were converted to common stock, covering 2,055 shares and 2,535 shares, each at an exercise price of $0. The filing also reports an acquisition of 21,902 shares of common stock from the vesting of performance stock units under the 2018 Equity Incentive Plan.

To satisfy related tax liabilities, the company withheld 1,807 shares and 8,620 shares at a price of $35.69 per share. After these transactions, the reporting person directly held 79,996 shares of Tetra Tech common stock. The footnotes clarify prior ESPP purchases and the vesting schedules of the RSU awards.

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^*

Hopson Preston

(Last) (First) (Middle)

3475 EAST FOOTHILL BLVD.

(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 Legal/Human Capital

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		2,055	A	$0	65,986(1)	D
COMMON STOCK	11/18/2025		M		2,535	A	$0	68,521	D
COMMON STOCK	11/18/2025		F		1,807(2)	D	$35.69	66,714	D
COMMON STOCK	11/18/2025		A		21,902(3)	A	$0	88,616	D
COMMON STOCK	11/18/2025		F		8,620(4)	D	$35.69	79,996	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			2,055	11/18/2022(6)	(7)	COMMON STOCK	2,055	$0	0	D
RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	(5)	11/18/2025		M			2,535	11/18/2023(8)	(7)	COMMON STOCK	2,535	$0	2,535	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	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).
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FAQ

What did Tetra Tech (TTEK) disclose in this Form 4 filing?

This Form 4 reports equity transactions by the EVP, Chief Legal/Human Capital of Tetra Tech (TTEK), including vesting of restricted and performance stock units, share issuances, and shares withheld to cover tax obligations on November 18, 2025.

How many TTEK shares were acquired through equity award vesting?

The executive acquired 2,055 shares and 2,535 shares of common stock from restricted stock units, plus 21,902 shares from vesting of performance stock units under the 2018 Equity Incentive Plan.

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

The filing shows 1,807 shares and 8,620 shares of Tetra Tech common stock withheld at $35.69 per share to pay tax liabilities related to vesting restricted and performance stock units on November 18, 2025.

What is the executive's TTEK share ownership after these transactions?

After the reported transactions, the executive directly beneficially owned 79,996 shares of Tetra Tech common stock.

What role does the reporting person hold at Tetra Tech (TTEK)?

The reporting person is an officer of Tetra Tech, Inc., serving as EVP, Chief Legal/Human Capital.

How do the restricted stock units (RSUs) described in the filing vest?

According to the footnotes, the RSU awards vest as to 25% of the shares on a specified initial date and 25% annually thereafter until fully vested, and each unit represents a contingent right to receive one share of Tetra Tech common stock.