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 |
| 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 |
| 10-Q | Quarterly report | May 1, 2026 | Mar 29, 2026 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 29, 2026 | Apr 29, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 26, 2026 | Mar 26, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Feb 20, 2026 | Feb 19, 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 7, 2025 | Oct 7, 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 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Feb 28, 2025 | Feb 24, 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 |
| 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 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Sep 6, 2024 | Sep 6, 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 |
| 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 |
| 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 | — |
| 10-Q | Quarterly report | Feb 2, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 31, 2024 | Jan 31, 2024 |
| UPLOAD | Letter from the SEC | Jan 30, 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 |
| 10-K | Annual report | Nov 22, 2023 | Oct 1, 2023 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Nov 15, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 15, 2023 | Nov 15, 2023 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Aug 22, 2023 | Aug 17, 2023 |
| 10-K/A | Amended annual report | Aug 15, 2023 | Oct 2, 2022 |
| 10-Q | Quarterly report | Aug 10, 2023 | Jul 2, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
Aug 9, 2023 | Aug 9, 2023 |
| 10-Q | Quarterly report | May 11, 2023 | Apr 2, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
May 10, 2023 | May 10, 2023 |
| 8-K |
Current report
Officer or director change
|
May 8, 2023 | May 2, 2023 |
| 8-K/A |
Amended current report
Acquisition or sale of assets
|
Apr 10, 2023 | Jan 19, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Mar 3, 2023 | Feb 28, 2023 |
| 10-Q | Quarterly report | Feb 3, 2023 | Jan 1, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 1, 2023 | Feb 1, 2023 |
| 8-K |
Current report
Acquisition or sale of assets, Regulation FD disclosure
|
Jan 24, 2023 | Jan 19, 2023 |
| DEFA14A | Additional proxy material | Jan 17, 2023 | — |
| DEF 14A | Proxy statement | Jan 17, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 12, 2022 | Dec 12, 2022 |
| 10-K | Annual report | Nov 25, 2022 | Oct 2, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Nov 15, 2022 | Nov 11, 2022 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Nov 10, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 9, 2022 | Nov 9, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 3, 2022 | Nov 3, 2022 |
| 8-K |
Current report
Material agreement, Agreement ended, Change to shareholder rights, Other events
|
Oct 28, 2022 | Oct 26, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 12, 2022 | Oct 11, 2022 |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Other events
|
Oct 11, 2022 | Oct 7, 2022 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Sep 26, 2022 | Sep 23, 2022 |
| 10-Q | Quarterly report | Aug 5, 2022 | Jul 3, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Aug 3, 2022 | Aug 3, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Aug 2, 2022 | Aug 2, 2022 |
| 10-Q | Quarterly report | May 6, 2022 | Apr 3, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
May 4, 2022 | May 4, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Mar 4, 2022 | Mar 1, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Feb 22, 2022 | Feb 22, 2022 |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Other events
|
Feb 22, 2022 | Feb 18, 2022 |
| 10-Q | Quarterly report | Feb 4, 2022 | Jan 2, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 2, 2022 | Feb 2, 2022 |
| DEFA14A | Additional proxy material | Jan 18, 2022 | — |
| DEF 14A | Proxy statement | Jan 18, 2022 | Mar 1, 2022 |
| 10-K | Annual report | Nov 24, 2021 | Oct 3, 2021 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 17, 2021 | Nov 17, 2021 |
| 8-K |
Current report
Other events
|
Oct 7, 2021 | Oct 7, 2021 |
| 10-Q | Quarterly report | Jul 30, 2021 | Jun 27, 2021 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 28, 2021 | Jul 28, 2021 |
| 10-Q | Quarterly report | Apr 30, 2021 | Mar 28, 2021 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 28, 2021 | Apr 28, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Feb 25, 2021 | Feb 24, 2021 |
| 10-Q | Quarterly report | Jan 29, 2021 | Dec 27, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 27, 2021 | Jan 27, 2021 |
| DEFA14A | Additional proxy material | Jan 14, 2021 | — |
| DEF 14A | Proxy statement | Jan 14, 2021 | Feb 24, 2021 |
| 10-K | Annual report | Nov 23, 2020 | Sep 27, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 12, 2020 | Nov 11, 2020 |
| 10-Q | Quarterly report | Jul 31, 2020 | Jun 28, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 29, 2020 | Jul 29, 2020 |
| 8-K |
Current report
Results of operations
|
Jun 9, 2020 | Jun 9, 2020 |
| 10-Q | Quarterly report | May 1, 2020 | Mar 29, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 29, 2020 | Apr 29, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Feb 27, 2020 | Feb 26, 2020 |
| 10-Q | Quarterly report | Jan 31, 2020 | Dec 29, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 29, 2020 | Jan 29, 2020 |
| DEFA14A | Additional proxy material | Jan 15, 2020 | — |
| DEF 14A | Proxy statement | Jan 15, 2020 | Feb 26, 2020 |
| 10-K | Annual report | Nov 29, 2019 | Sep 29, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 13, 2019 | Nov 13, 2019 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 2, 2019 | Sep 30, 2019 |
| 10-Q | Quarterly report | Aug 2, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 31, 2019 | Jul 31, 2019 |
| 10-Q | Quarterly report | May 3, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
May 1, 2019 | May 1, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Mar 1, 2019 | Feb 28, 2019 |
| 10-Q | Quarterly report | Feb 1, 2019 | Dec 30, 2018 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 30, 2019 | Jan 30, 2019 |
| DEFA14A | Additional proxy material | Jan 18, 2019 | — |
| DEF 14A | Proxy statement | Jan 18, 2019 | Feb 28, 2019 |
| 10-K | Annual report | Nov 16, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations, Officer or director change, Other events
|
Nov 7, 2018 | Nov 7, 2018 |
| S-8 | Employee stock plan registration | Aug 3, 2018 | — |
| 10-Q | Quarterly report | Aug 3, 2018 | Jul 1, 2018 |
| 8-K |
Current report
Material agreement, Results of operations, Change to shareholder rights, Officer or director change, Other events
|
Aug 1, 2018 | Jul 30, 2018 |
| 10-Q | Quarterly report | May 4, 2018 | Apr 1, 2018 |
| 8-K |
Current report
Results of operations, Other events
|
May 2, 2018 | May 2, 2018 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Mar 9, 2018 | Mar 8, 2018 |
| 10-Q | Quarterly report | Feb 1, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 31, 2018 | Jan 31, 2018 |
| DEFA14A | Additional proxy material | Jan 24, 2018 | — |
| DEF 14A | Proxy statement | Jan 24, 2018 | Mar 8, 2018 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 22, 2018 | Jan 22, 2018 |
| 10-K | Annual report | Nov 20, 2017 | Oct 1, 2017 |
| 8-K |
Current report
Results of operations, Officer or director change, Other events
|
Nov 9, 2017 | Nov 8, 2017 |
| 10-Q | Quarterly report | Aug 4, 2017 | Jul 2, 2017 |
| 8-K |
Current report
Results of operations, Other events
|
Aug 3, 2017 | Aug 2, 2017 |
| 10-Q | Quarterly report | May 5, 2017 | Apr 2, 2017 |
| 8-K |
Current report
Results of operations, Other events
|
May 4, 2017 | May 3, 2017 |
| 8-K |
Current report
Shareholder vote results
|
Mar 3, 2017 | Mar 2, 2017 |
| 10-Q | Quarterly report | Feb 3, 2017 | Jan 1, 2017 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 2, 2017 | Feb 1, 2017 |
| DEFA14A | Additional proxy material | Jan 18, 2017 | — |
| DEF 14A | Proxy statement | Jan 18, 2017 | Mar 2, 2017 |
| 10-K | Annual report | Nov 22, 2016 | Oct 2, 2016 |
| 8-K |
Current report
Results of operations, Officer or director change, Other events
|
Nov 10, 2016 | Nov 9, 2016 |
| 10-Q | Quarterly report | Jul 29, 2016 | Jun 26, 2016 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 28, 2016 | Jul 27, 2016 |
| S-8 | Employee stock plan registration | May 5, 2016 | — |
| 10-Q | Quarterly report | May 4, 2016 | Mar 27, 2016 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 28, 2016 | Apr 27, 2016 |
| UPLOAD | Letter from the SEC | Apr 19, 2016 | — |
| CORRESP | Letter to the SEC | Apr 15, 2016 | — |
| UPLOAD | Letter from the SEC | Mar 28, 2016 | — |
| CORRESP | Letter to the SEC | Mar 17, 2016 | — |
| 8-K |
Current report
Shareholder vote results
|
Mar 4, 2016 | Mar 3, 2016 |
| UPLOAD | Letter from the SEC | Feb 18, 2016 | — |
| 10-Q | Quarterly report | Jan 29, 2016 | Dec 27, 2015 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 28, 2016 | Jan 27, 2016 |
| 8-K |
Current report
Other events
|
Jan 19, 2016 | Jan 19, 2016 |
| DEFA14A | Additional proxy material | Jan 19, 2016 | — |
| DEF 14A | Proxy statement | Jan 19, 2016 | Mar 3, 2016 |
| 10-K | Annual report | Nov 20, 2015 | Sep 27, 2015 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 12, 2015 | Nov 11, 2015 |
| 8-K |
Current report
Other events
|
Oct 14, 2015 | Oct 14, 2015 |
| 10-Q | Quarterly report | Jul 31, 2015 | Jun 28, 2015 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 30, 2015 | Jul 29, 2015 |
| 8-K |
Current report
Material agreement
|
Jun 2, 2015 | May 29, 2015 |
| 8-K |
Current report
Officer or director change
|
May 13, 2015 | May 13, 2015 |
| 10-Q | Quarterly report | May 1, 2015 | Mar 29, 2015 |
| S-8 | Employee stock plan registration | May 1, 2015 | — |
| 8-K |
Current report
Results of operations, Other events
|
Apr 30, 2015 | Apr 29, 2015 |
| UPLOAD | Letter from the SEC | Apr 14, 2015 | — |
| CORRESP | Letter to the SEC | Apr 10, 2015 | — |
| 8-K |
Current report
Officer or director change
|
Apr 9, 2015 | Apr 8, 2015 |
| UPLOAD | Letter from the SEC | Mar 31, 2015 | — |
| CORRESP | Letter to the SEC | Mar 27, 2015 | — |
| 8-K |
Current report
Shareholder vote results
|
Mar 6, 2015 | Mar 5, 2015 |
| UPLOAD | Letter from the SEC | Feb 27, 2015 | — |
| 10-Q | Quarterly report | Feb 2, 2015 | Dec 28, 2014 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 29, 2015 | Jan 28, 2015 |
| DEFA14A | Additional proxy material | Jan 15, 2015 | — |
| DEF 14A | Proxy statement | Jan 15, 2015 | Mar 5, 2015 |
Showing 187 filings. 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.