TETRA TECH INC — Director's Dealing 2021

Feb 1, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2021-01-29

Reporting Person: O'Rourke Brendan M. (SVP, Enterprise Risk Mgmt.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-01-29	COMMON STOCK	M	250	—	Acquired	1708	Direct
2021-01-29	COMMON STOCK	F	94	$121.57	Disposed	1614	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-01-29	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	$0.0	M	250	Disposed	2022-01-29	COMMON STOCK (250.0)	Direct

Footnotes

F1: Shares were automatically acquired upon the vesting of restricted stock units (RSUs).

F2: Amount of securities beneficially owned was updated to reflect that 58 shares of common stock were acquired by the Reporting Person on December 15, 2020, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP).

F3: Represents the number of shares withheld to pay the related tax liability on the restricted stock units (RSUs) which vested on 01/29/2021.

F4: The closing trading price of the underlying common stock on 01/29/2021 when the RSUs vested.

F5: The RSUs became vested as to 25% of the shares on January 29, 2019, and the anniversary of that date going forward until fully vested.