Tetra Tech (TTEK) director awarded 4,104 shares on Form 4

Tetra Tech, Inc. (TTEK) reported an insider equity transaction by a company director on Form 4.

Rhea-AI Filing Summary

Tetra Tech, Inc. (TTEK) reported an insider equity transaction by a company director on Form 4. On 11/18/2025, the director acquired 4,104 shares of common stock at a price of $0 per share. These shares were received through the vesting of performance stock units earned under the company’s 2018 Equity Incentive Plan, meaning no cash purchase was involved. Following this vesting, the director beneficially owned 66,500 shares of Tetra Tech common stock in direct ownership.

Insider Trade Summary

Grant/Award: 4,104 shares

Grant/Award 1 txn

Insider Volpi Kirsten M

Role Director

Type	Security	Shares	Price	Value
Grant/Award	COMMON STOCK	4,104	$0.00	$0.00

Holdings After Transaction: COMMON STOCK — 66,500 shares (Direct)

Footnotes (1)

1. F1. Shares acquired pursuant to vesting of performance stock units earned under 2018 Equity Incentive Plan.

FAQ

What insider transaction did Tetra Tech (TTEK) report on this Form 4?

The filing reports that a Tetra Tech director acquired 4,104 shares of common stock on 11/18/2025 through an equity award vesting.

At what price were the TTEK shares acquired in this Form 4 filing?

The 4,104 Tetra Tech common shares were acquired at a price of $0 per share, reflecting vesting of performance stock units rather than an open-market purchase.

How many Tetra Tech (TTEK) shares does the reporting director own after the transaction?

After the reported transaction, the director beneficially owned 66,500 shares of Tetra Tech common stock in direct ownership.

What was the source of the 4,104 TTEK shares acquired by the director?

The 4,104 shares were acquired upon vesting of performance stock units earned under Tetra Tech’s 2018 Equity Incentive Plan.

What is the relationship of the reporting person to Tetra Tech (TTEK)?

The reporting person is identified as a Director of Tetra Tech, Inc. and filed the Form 4 as an individual reporting person.

Does this TTEK Form 4 involve derivative securities like options or warrants?

The filing’s Table II for derivative securities does not list any acquired or disposed derivative instruments in connection with this transaction.

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Accepted by SEC EDGAR 11/20/2025 - 06:38 PM Learn about SEC filing dates

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Volpi Kirsten M

(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
	Officer (give title below)		Other (specify below)

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		A		4,104(1)	A	$0	66,500	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

Explanation of Responses:

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

Remarks:

	/s/ Preston Hopson, Attorney-in-fact for Kirsten M. Volpi	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.
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