TETRA TECH INC — Director's Dealing 2012

Mar 13, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2012-03-09

Reporting Person: LEMMON RICHARD A (SENIOR VICE PRESIDENT)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-12-30	COMMON STOCK	A	272	$18.3515	Acquired	17064	Direct
2012-03-09	COMMON STOCK	M	5000	$12.84	Acquired	22064	Direct
2012-03-09	COMMON STOCK	S	5000	$24.5119	Disposed	17064	Direct
2012-03-09	COMMON STOCK	M	5000	$12.84	Acquired	22064	Direct
2012-03-09	COMMON STOCK	S	5000	$24.50	Disposed	17064	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-09	STOCK OPTION	$12.84	M	5000	Disposed	2012-12-23	COMMON STOCK (5000)	Direct
2012-03-09	STOCK OPTION	$12.84	M	5000	Disposed	2012-12-23	COMMON STOCK (5000)	Direct

Footnotes

F1: Consists of 272 shares acquired under the Tetra Tech, Inc. Employee Stock Purchase Plan (an exempt transaction under Rule 16b-3(c)).

F2: The option was fully vested as of December 23, 2006.

F3: The option was fully vested as of December 23, 2006.