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: CHRISTENSEN CRAIG L (SVP & CIO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-08	COMMON STOCK	M	16750	$23.48	Acquired	46687	Direct
2017-05-08	COMMON STOCK	S	16750	$46.5463	Disposed	29937	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-08	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	$23.48	M	16750	Disposed	2018-11-12	COMMON STOCK (16750)	Direct

Footnotes

F1: The option became fully vested on November 12, 2014.

F2: In addition to the 16,750 shares acquired in the option exercise, the reporting person acquired 92 shares of common stock pursuant to the company's Employee Stock Purchase Plan (ESPP) on December 15, 2016.

F3: $46.5463 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.40 to $46.575