TETRA TECH INC — Director's Dealing 2025

Dec 2, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2025-11-19

Reporting Person: Volpi Kirsten M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-30	COMMON STOCK	M	1718	—	Acquired	68218	Direct
2025-11-28	COMMON STOCK	M	1000	$9.59	Acquired	69218	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-11-19	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	$	A	1964	Acquired		COMMON STOCK (1964)	Direct
2025-11-28	STOCK OPTION (RIGHT TO BUY)	$9.59	M	1000	Disposed	2027-11-18	COMMON STOCK (1000)	Direct
2025-11-30	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	$	M	1718	Disposed		COMMON STOCK (1718)	Direct

Footnotes

F1: 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.

F2: The RSUs become 100% vested as to the shares underlying the RSUs on November 30, 2026.

F3: The RSUs are exercisable at the time of vesting and do not have a set expiration date.

F4: The option becomes exercisable as to 100% of the shares on the anniversary of the grant date.

F5: The RSUs become 100% vested as to the shares underlying the RSUs on November 30, 2025.