# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000831641-25-000032
Filing Date
2025-11-20
Accepted
2025-11-20 16:11:42
Documents
143
Period of Report
2025-09-28

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 10-K | ttek-20250928.htm iXBRL | 10-K | 2567535
2 | EX-4.3 | ttekex43q42025.htm | EX-4.3 | 32088
3 | EX-19.1 | ttekex191q42025.htm | EX-19.1 | 32940
4 | EX-19.2 | ttekex192q42025.htm | EX-19.2 | 42523
5 | EX-21 | ttek-ex21q42025.htm | EX-21 | 13997
6 | EX-23 | ttek-ex23q42025.htm | EX-23 | 2021
7 | EX-31.1 | ttek-ex311q42025.htm | EX-31.1 | 8857
8 | EX-31.2 | ttek-ex312q42025.htm | EX-31.2 | 8856
9 | EX-32.1 | ttek-ex321q42025.htm | EX-32.1 | 5071
10 | EX-32.2 | ttek-ex322q42025.htm | EX-32.2 | 5061
11 | EX-95 | ttek-ex95q42025.htm | EX-95 | 15841
12 | EX-97.1 | ttekex971q42025.htm | EX-97.1 | 36834
18 |  | image_0a.jpg | GRAPHIC | 121341
19 |  | image_2.jpg | GRAPHIC | 93149
20 |  | image_3a.jpg | GRAPHIC | 264
21 |  | ttek-20250928_g1.jpg | GRAPHIC | 86437
| Complete submission text file | 0000831641-25-000032.txt |  | 15135714

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
13 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | ttek-20250928.xsd | EX-101.SCH | 95933
14 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | ttek-20250928_cal.xml | EX-101.CAL | 165426
15 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | ttek-20250928_def.xml | EX-101.DEF | 418062
16 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | ttek-20250928_lab.xml | EX-101.LAB | 1160039
17 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | ttek-20250928_pre.xml | EX-101.PRE | 815282
146 | EXTRACTED XBRL INSTANCE DOCUMENT | ttek-20250928_htm.xml | XML | 2335101

Mailing Address 3475 EAST FOOTHILL BOULEVARD PASADENA CA 91107
Business Address 3475 EAST FOOTHILL BOULEVARD PASADENA CA 91107 6263514664
TETRA TECH INC (Filer) CIK: 0000831641 (see all company filings)

EIN.: 954148514 | State of Incorp.: DE | Fiscal Year End: 0928
Type: 10-K | Act: 34 | File No.: 000-19655 | Film No.: 251503169
SIC: 8711 Services-Engineering Services
(CF Office: 07 Trade & Services)