TETRA TECH INC — Director's Dealing 2026

Feb 20, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2026-02-19

Reporting Person: Obiaya Christiana (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-19	COMMON STOCK	M	495	—	Acquired	9666	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-19	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	$	M	495	Disposed		COMMON STOCK (495)	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: Vesting of the RSUs, which was initially scheduled for November 18, 2026, was accelerated on the Reporting Person's retirement from the Issuer's board of directors.

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

F4: Balance of 1,469 RSUs were cancelled upon retirement.