<SEC-DOCUMENT>0001104659-16-090373-index.html : 20160119 <SEC-HEADER>0001104659-16-090373.hdr.sgml : 20160118 <ACCEPTANCE-DATETIME>20160119132033 ACCESSION NUMBER: 0001104659-16-090373 CONFORMED SUBMISSION TYPE: DEFA14A PUBLIC DOCUMENT COUNT: 5 FILED AS OF DATE: 20160119 DATE AS OF CHANGE: 20160119 EFFECTIVENESS DATE: 20160119 FILER: COMPANY DATA: COMPANY CONFORMED NAME: TETRA TECH INC CENTRAL INDEX KEY: 0000831641 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-ENGINEERING SERVICES [8711] IRS NUMBER: 954148514 STATE OF INCORPORATION: DE FISCAL YEAR END: 0928 FILING VALUES: FORM TYPE: DEFA14A SEC ACT: 1934 Act SEC FILE NUMBER: 000-19655 FILM NUMBER: 161347739 BUSINESS ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 BUSINESS PHONE: 6263514664 MAIL ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 </SEC-HEADER> <DOCUMENT> <TYPE>DEFA14A <SEQUENCE>1 <FILENAME>a16-1500_3defa14a.htm <DESCRIPTION>DEFA14A <TEXT> Document 1 - file: a16-1500_3defa14a.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>2 <FILENAME>g15003bgi001.gif <DESCRIPTION>GRAPHIC <TEXT> Document 2 - file: g15003bgi001.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>g15003bgi002.gif <DESCRIPTION>GRAPHIC <TEXT> Document 3 - file: g15003bgi002.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>g15003bgi003.gif <DESCRIPTION>GRAPHIC <TEXT> Document 4 - file: g15003bgi003.gif
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>g15003bgi004.gif <DESCRIPTION>GRAPHIC <TEXT> Document 5 - file: g15003bgi004.gif
</DOCUMENT> </SEC-DOCUMENT>