Tetra Tech Inc SEC filings TTEK
Tetra Tech Inc has 1,000 filings in SEC EDGAR's recent list, going back to Jan 8, 2015. Its latest annual report, Form ARS, was filed on Jan 9, 2026 for the period ended Sep 28, 2025. The latest quarterly report (Form 10-Q) was filed on Jul 31, 2026, covering the quarter ended Jun 28, 2026. The most recent current report (Form 8-K) was filed on Sep 10, 2026 (other events). The company's fiscal year ends on September 27.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Other events
|
Sep 10, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Aug 6, 2026 | Aug 4, 2026 |
| S-8 | Employee stock plan registration | Aug 5, 2026 | — |
| 10-Q | Quarterly report | Jul 31, 2026 | Jun 28, 2026 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 29, 2026 | Jul 29, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 10-Q | Quarterly report | May 1, 2026 | Mar 29, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| 8-K |
Current report
Results of operations, Other events
|
Apr 29, 2026 | Apr 29, 2026 |
| 4 | Insider transaction | Apr 28, 2026 | Apr 27, 2026 |
| 3 | Initial insider ownership | Apr 3, 2026 | Mar 30, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 26, 2026 | Mar 26, 2026 |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Feb 20, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 20, 2026 | Feb 19, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Feb 20, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 144 | Notice of proposed sale | Feb 4, 2026 | — |
| 10-Q | Quarterly report | Jan 30, 2026 | Dec 28, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 28, 2026 | Jan 28, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 14, 2026 | Jan 1, 2025 |
| 4 | Insider transaction | Jan 14, 2026 | Jan 12, 2026 |
| ARS | Annual report to shareholders | Jan 9, 2026 | Sep 28, 2025 |
| DEFA14A | Additional proxy material | Jan 9, 2026 | — |
| DEF 14A | Proxy statement | Jan 9, 2026 | Feb 19, 2026 |
| 3 | Initial insider ownership | Jan 8, 2026 | Dec 29, 2025 |
| 3 | Initial insider ownership | Jan 6, 2026 | Dec 29, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 6, 2026 | Jan 6, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 22, 2025 | Dec 22, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 19, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 10-K | Annual report | Nov 20, 2025 | Sep 28, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 12, 2025 | Nov 12, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 17, 2025 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 7, 2025 | Oct 7, 2025 |
| 4 | Insider transaction | Aug 15, 2025 | Aug 14, 2025 |
| 144 | Notice of proposed sale | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 1, 2025 | Jun 29, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 30, 2025 | Jul 30, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 30, 2025 |
| 8-K |
Current report
Material agreement, Results of operations, New debt, Change to shareholder rights, Other events
|
May 7, 2025 | May 5, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 7, 2025 | — |
| 4/A | Form 4/a | Mar 14, 2025 | Nov 20, 2024 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Feb 28, 2025 | Feb 24, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 11, 2025 | — |
| 4 | Insider transaction | Feb 6, 2025 | Feb 4, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 6, 2025 | — |
| 144 | Notice of proposed sale | Feb 4, 2025 | — |
| 10-Q | Quarterly report | Jan 31, 2025 | Dec 29, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 30, 2025 | Jan 29, 2025 |
| 8-K |
Current report
Other events
|
Jan 17, 2025 | Jan 17, 2025 |
| ARS | Annual report to shareholders | Jan 16, 2025 | Sep 29, 2024 |
| DEFA14A | Additional proxy material | Jan 16, 2025 | — |
| DEF 14A | Proxy statement | Jan 16, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 30, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 21, 2024 | — |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| 10-K | Annual report | Nov 19, 2024 | Sep 29, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 13, 2024 | Nov 13, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 30, 2024 |
| 3 | Initial insider ownership | Oct 2, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Sep 12, 2024 | Sep 11, 2024 |
| 4 | Insider transaction | Sep 12, 2024 | Sep 11, 2024 |
| 4 | Insider transaction | Sep 12, 2024 | Sep 10, 2024 |
| 4 | Insider transaction | Sep 12, 2024 | Sep 10, 2024 |
| 144 | Notice of proposed sale | Sep 11, 2024 | — |
| 144 | Notice of proposed sale | Sep 11, 2024 | — |
| 144 | Notice of proposed sale | Sep 10, 2024 | — |
| 144 | Notice of proposed sale | Sep 10, 2024 | — |
| 8-K |
Current report
Bylaw or fiscal year change
|
Sep 6, 2024 | Sep 6, 2024 |
| 4 | Insider transaction | Aug 22, 2024 | Aug 20, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 12, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 6, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 7, 2024 |
| 4 | Insider transaction | Aug 7, 2024 | Aug 5, 2024 |
| 144 | Notice of proposed sale | Aug 7, 2024 | — |
| 144 | Notice of proposed sale | Aug 6, 2024 | — |
| 144 | Notice of proposed sale | Aug 5, 2024 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Aug 2, 2024 | Jul 29, 2024 |
| 10-Q | Quarterly report | Aug 2, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 31, 2024 | Jul 31, 2024 |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 144 | Notice of proposed sale | Jun 13, 2024 | — |
| 8-K |
Current report
Officer or director change
|
May 24, 2024 | May 21, 2024 |
| 10-Q | Quarterly report | May 3, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
May 1, 2024 | May 1, 2024 |
| 4 | Insider transaction | Apr 30, 2024 | Apr 26, 2023 |
| UPLOAD | Letter from the SEC | Apr 5, 2024 | — |
| CORRESP | Letter to the SEC | Apr 5, 2024 | — |
| UPLOAD | Letter from the SEC | Mar 13, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Mar 1, 2024 | Feb 29, 2024 |
| CORRESP | Letter to the SEC | Mar 1, 2024 | — |
| 4 | Insider transaction | Feb 22, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 144 | Notice of proposed sale | Feb 22, 2024 | — |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| 144 | Notice of proposed sale | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| 4 | Insider transaction | Feb 13, 2024 | Feb 9, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| 144 | Notice of proposed sale | Feb 9, 2024 | — |
| 4 | Insider transaction | Feb 7, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 7, 2024 | Feb 5, 2024 |
| 4 | Insider transaction | Feb 7, 2024 | Feb 5, 2024 |
| 144 | Notice of proposed sale | Feb 5, 2024 | — |
| 144 | Notice of proposed sale | Feb 5, 2024 | — |
| 10-Q | Quarterly report | Feb 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 31, 2024 | Jan 31, 2024 |
| SC 13G | Ownership over 5% (passive) | Jan 31, 2024 | — |
| UPLOAD | Letter from the SEC | Jan 30, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2024 | — |
| ARS | Annual report to shareholders | Jan 18, 2024 | Oct 1, 2023 |
| DEFA14A | Additional proxy material | Jan 18, 2024 | — |
| DEF 14A | Proxy statement | Jan 18, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Dec 5, 2023 | Dec 1, 2023 |
| 4 | Insider transaction | Dec 5, 2023 | Dec 4, 2023 |
| 144 | Notice of proposed sale | Dec 4, 2023 | — |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| 4 | Insider transaction | Nov 29, 2023 | Nov 28, 2023 |
| 144 | Notice of proposed sale | Nov 28, 2023 | — |
| 4 | Insider transaction | Nov 28, 2023 | Nov 27, 2023 |
| 4 | Insider transaction | Nov 28, 2023 | Nov 27, 2023 |
| 144 | Notice of proposed sale | Nov 27, 2023 | — |
| 144 | Notice of proposed sale | Nov 27, 2023 | — |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4 | Insider transaction | Nov 22, 2023 | Nov 21, 2023 |
| 4/A | Form 4/a | Nov 22, 2023 | Nov 18, 2023 |
| 144 | Notice of proposed sale | Nov 22, 2023 | — |
| 10-K | Annual report | Nov 22, 2023 | Oct 1, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 18, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Services-Engineering Services (SIC 8711)
- Listed as
- TTEK (Nasdaq)
- Fiscal year ends
- September 27
- Incorporated in
- DE
- Headquarters
- Pasadena, CA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 831641
Other Services-Engineering Services companies
- Stantec Inc STN
- Aecom ACM
- Vse Corp VSEC
- Willdan Group, Inc. WLDN
- Mistras Group, Inc. MG
- Julong Holding Ltd JLHL
- HyOrc Corp HYOR
- Acorn Energy, Inc. ACFN
Source: SEC EDGAR filings. This is company-reported data, not investment advice.