TETRA TECH INC — Director's Dealing 2017

May 9, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2017-05-08

Reporting Person: SALIN JANIS B (SVP and General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-08	COMMON STOCK	M	16750	$25.55	Acquired	43047	Direct
2017-05-08	COMMON STOCK	S	16750	$46.4646	Disposed	26297	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-08	COMMON STOCK	$25.55	D	16750	Disposed	2017-11-13	COMMON STOCK (16750)	Direct

Footnotes

F1: The option was fully exercisable on November 13, 2013.

F2: The option expires in the current year.

F3: In addition to the 16,750 shares 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.

F4: $46.4646 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.45 to $46.455.