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 |
|---|---|---|---|
| 4 | Insider transaction | Aug 6, 2026 | Aug 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 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 | — |
| 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 |
| 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 | — |
| 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 |
| 3 | Initial insider ownership | Jan 8, 2026 | Dec 29, 2025 |
| 3 | Initial insider ownership | Jan 6, 2026 | Dec 29, 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 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 17, 2025 | — |
| 4 | Insider transaction | Aug 15, 2025 | Aug 14, 2025 |
| 144 | Notice of proposed sale | Aug 14, 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 |
| 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 | — |
| 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 |
| 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 | — |
| 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 | — |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 144 | Notice of proposed sale | Jun 13, 2024 | — |
| 4 | Insider transaction | Apr 30, 2024 | Apr 26, 2023 |
| 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 | — |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| SC 13G | Ownership over 5% (passive) | Jan 31, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 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 | — |
| 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 |
| 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 |
| 144 | Notice of proposed sale | Nov 20, 2023 | — |
| 144 | Notice of proposed sale | Nov 20, 2023 | — |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 5 | Annual insider ownership | Nov 15, 2023 | Oct 1, 2023 |
| 144 | Notice of proposed sale | Aug 8, 2023 | — |
| 4 | Insider transaction | Jun 14, 2023 | Jun 13, 2023 |
| 144 | Notice of proposed sale | Jun 13, 2023 | — |
| 4 | Insider transaction | Jun 8, 2023 | Jun 7, 2023 |
| 144 | Notice of proposed sale | Jun 7, 2023 | — |
| 4 | Insider transaction | Jun 5, 2023 | Jun 2, 2023 |
| 144 | Notice of proposed sale | Jun 2, 2023 | — |
| 4 | Insider transaction | Mar 1, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Feb 21, 2023 | Feb 16, 2023 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2023 | — |
| 4 | Insider transaction | Feb 10, 2023 | Feb 8, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 3, 2023 | — |
| 4 | Insider transaction | Feb 1, 2023 | Jan 30, 2023 |
| 3 | Initial insider ownership | Jan 10, 2023 | Jan 2, 2023 |
| 4 | Insider transaction | Dec 16, 2022 | Dec 15, 2022 |
| 4 | Insider transaction | Dec 16, 2022 | Dec 14, 2022 |
| 4 | Insider transaction | Dec 15, 2022 | Dec 13, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Dec 12, 2022 | — |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Nov 28, 2022 | Nov 23, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 18, 2022 |
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.
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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
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.