TETRA TECH INC - Director's Dealing 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2012-08-14

Reporting Person: SMITH DOUGLAS G (EXECUTIVE VICE PRESIDENT)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-14	COMMON STOCK	M	6485	$17.71	Acquired	49071	Direct
2012-08-14	COMMON STOCK	M	5108	$23.48	Acquired	54179	Direct
2012-08-14	COMMON STOCK	M	9250	$16.98	Acquired	63.429	Direct
2012-08-14	COMMON STOCK	S	6485	$26.623	Disposed	56944	Direct
2012-08-14	COMMON STOCK	S	5108	$26.623	Disposed	51836	Direct
2012-08-14	COMMON STOCK	S	9250	$26.623	Disposed	42586	Direct
2012-08-14	COMMON STOCK	S	13136	$26.623	Disposed	29450	Direct
2012-08-15	COMMON STOCK	M	21400	$23.68	Acquired	50850	Direct
2012-08-15	COMMON STOCK	S	21400	$26.5139	Disposed	29450	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-14	Employee Stock Option (Right to Buy)	$17.71	M	6485	Disposed	2014-12-05	Common Stock (6485)	Direct
2012-08-14	Employee Stock Option (Right to Buy)	$23.48	M	5108	Disposed	2018-11-12	Common Stock (5108)	Direct
2012-08-14	Employee Stock Option (Right to Buy)	$16.98	M	9250	Disposed	2016-11-14	Common Stock (9250)	Direct
2012-08-15	Employee Stock Option (Right to Buy)	$23.68	M	21400	Disposed	2015-11-16	Common Stock (21400)	Direct

F1: Pursuant to a 10b5-1 Plan.

F2: The option was fully vested on December 5, 2010.

F3: The option was fully vested on November 12, 2011.

F4: The option was fully vested on November 14, 2011.

F5: The option was fully vested on November 16, 2011.