TETRA TECH INC — Director's Dealing 2017

May 5, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2017-05-04

Reporting Person: CHU RONALD J (EXECUTIVE VICE PRESIDENT)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-04	COMMON STOCK	M	32951	$23.48	Disposed	70055	Direct
2017-05-04	COMMON STOCK	S	32951	$46.0035	Disposed	37104	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-04	STOCK OPTION (RIGHT TO BUY)	$23.48	M	32951	Disposed	2018-11-12	COMMON STOCK (32951)	Direct

Footnotes

F1: The option was fully exercisable on November 12, 2014.

F2: In addition to the 32,951shares acquired in the option exercise, the reporting person acquired 192 shares of common stock pursuant to the company's Employee Stock Purchase Plan (ESPP) on December 15, 2016.

F3: $46.0035 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.00 to $46.005 pursuant to a 10b5-1 automatic trading plan.