# Tetra Tech Inc: filings

TTEK · Nasdaq · CIK 831641 · [Industrials](/sectors/industrials.md) · fiscal year ends Sep 27

Pages: [Overview](/companies/ttek.md) · [Financials](/companies/ttek/financials.md) · [Filings](/companies/ttek/filings.md) · [Insiders](/companies/ttek/insiders.md)

## Reports and events: 230 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 1058, 8-K 134, 10-Q 54, SC 13G/A 45, 4/A 36, 5 36, 144 28, 3 22, DEF 14A 18, UPLOAD 18, 10-K 17, DEFA14A 16, CORRESP 12, SC 13G 12, S-8 7, 8-K/A 3, ARS 3, SCHEDULE 13G/A 3, 10-K/A 2, SCHEDULE 13D/A 2, SCHEDULE 13G 2).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-09-10 | 09:00 ET | [8-K](/filings/0001104659-26-106564.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-106564 |
| 2026-07-31 | 16:34 ET | [10-Q](/filings/0000831641-26-000017.md) | Quarterly report, period 2026-06-28 | 0000831641-26-000017 |
| 2026-07-29 | 16:58 ET | [8-K](/filings/0001104659-26-088213.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-088213 |
| 2026-05-01 | 16:33 ET | [10-Q](/filings/0000831641-26-000011.md) | Quarterly report, period 2026-03-29 | 0000831641-26-000011 |
| 2026-04-29 | 16:06 ET | [8-K](/filings/0001104659-26-051486.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-051486 |
| 2026-03-26 | 16:05 ET | [8-K](/filings/0001104659-26-035179.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-035179 |
| 2026-02-20 | 17:00 ET | [8-K](/filings/0001104659-26-018205.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-26-018205 |
| 2026-01-30 | 16:02 ET | [10-Q](/filings/0000831641-26-000005.md) | Quarterly report, period 2025-12-28 | 0000831641-26-000005 |
| 2026-01-28 | 17:15 ET | [8-K](/filings/0001104659-26-007481.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-007481 |
| 2026-01-09 | 16:04 ET | [DEF 14A](/filings/0001104659-26-002458.md) | Proxy statement, period 2026-02-19 | 0001104659-26-002458 |
| 2026-01-06 | 16:34 ET | [8-K](/filings/0001104659-26-001352.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-001352 |
| 2025-12-22 | 16:32 ET | [8-K](/filings/0001104659-25-123764.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-123764 |
| 2025-11-20 | 16:11 ET | [10-K](/filings/0000831641-25-000032.md) | Annual report, period 2025-09-28 | 0000831641-25-000032 |
| 2025-11-12 | 17:31 ET | [8-K](/filings/0001104659-25-110537.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-110537 |
| 2025-10-17 | 13:09 ET | [SCHEDULE 13D/A](/filings/0001361570-25-000021.md) | Ownership report, active investor, amended | 0001361570-25-000021 |
| 2025-10-07 | 17:04 ET | [8-K](/filings/0001104659-25-097567.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-097567 |
| 2025-08-01 | 16:05 ET | [10-Q](/filings/0000831641-25-000023.md) | Quarterly report, period 2025-06-29 | 0000831641-25-000023 |
| 2025-07-30 | 17:12 ET | [8-K](/filings/0001104659-25-072237.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-072237 |
| 2025-05-08 | 16:36 ET | [10-Q](/filings/0000831641-25-000019.md) | Quarterly report, period 2025-03-30 | 0000831641-25-000019 |
| 2025-05-07 | 16:45 ET | [8-K](/filings/0001104659-25-045597.md) | 1.01 Entry into a material agreement; 2.02 Results of operations; 2.03 New direct financial obligation; 3.03 Change to security holders’ rights; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-045597 |
| 2025-04-15 | 14:06 ET | [SCHEDULE 13D/A](/filings/0001361570-25-000009.md) | Ownership report, active investor, amended | 0001361570-25-000009 |
| 2025-02-28 | 16:01 ET | [8-K](/filings/0001104659-25-019107.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results | 0001104659-25-019107 |
| 2025-01-31 | 16:06 ET | [10-Q](/filings/0000831641-25-000005.md) | Quarterly report, period 2024-12-29 | 0000831641-25-000005 |
| 2025-01-30 | 17:39 ET | [8-K](/filings/0001104659-25-007277.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-007277 |
| 2025-01-17 | 17:05 ET | [8-K](/filings/0001104659-25-004551.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-004551 |
| 2025-01-16 | 16:00 ET | [DEF 14A](/filings/0001104659-25-004095.md) | Proxy statement, period 2025-02-27 | 0001104659-25-004095 |
| 2024-11-19 | 16:11 ET | [10-K](/filings/0000831641-24-000063.md) | Annual report, period 2024-09-29 | 0000831641-24-000063 |
| 2024-11-13 | 16:07 ET | [8-K](/filings/0001104659-24-117683.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-24-117683 |
| 2024-09-06 | 17:05 ET | [8-K](/filings/0001104659-24-097783.md) | 5.03 Amendment to articles or bylaws; 9.01 Financial statements and exhibits | 0001104659-24-097783 |
| 2024-08-02 | 16:40 ET | [8-K](/filings/0001104659-24-085407.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-24-085407 |
| 2024-08-02 | 16:02 ET | [10-Q](/filings/0000831641-24-000035.md) | Quarterly report, period 2024-06-30 | 0000831641-24-000035 |
| 2024-07-31 | 16:06 ET | [8-K](/filings/0001104659-24-084338.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-24-084338 |
| 2024-05-24 | 17:05 ET | [8-K](/filings/0001104659-24-065180.md) | 5.02 Departure or appointment of officers or directors | 0001104659-24-065180 |
| 2024-05-03 | 16:07 ET | [10-Q](/filings/0000831641-24-000029.md) | Quarterly report, period 2024-03-31 | 0000831641-24-000029 |
| 2024-05-01 | 17:01 ET | [8-K](/filings/0001104659-24-055798.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-24-055798 |
| 2024-03-01 | 16:00 ET | [8-K](/filings/0001104659-24-029950.md) | 5.07 Shareholder vote results | 0001104659-24-029950 |
| 2024-02-02 | 16:07 ET | [10-Q](/filings/0000831641-24-000008.md) | Quarterly report, period 2023-12-31 | 0000831641-24-000008 |
| 2024-01-31 | 16:33 ET | [8-K](/filings/0001104659-24-008841.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-24-008841 |
| 2024-01-18 | 16:00 ET | [DEF 14A](/filings/0001104659-24-004794.md) | Proxy statement, period 2024-02-29 | 0001104659-24-004794 |
| 2023-11-22 | 16:16 ET | [10-K](/filings/0000831641-23-000082.md) | Annual report, period 2023-10-01 | 0000831641-23-000082 |
| 2023-11-15 | 17:11 ET | [8-K/A](/filings/0001104659-23-118774.md) | 5.07 Shareholder vote results | 0001104659-23-118774 |
| 2023-11-15 | 17:07 ET | [8-K](/filings/0001104659-23-118762.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-23-118762 |
| 2023-08-22 | 16:11 ET | [8-K](/filings/0001104659-23-094243.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 3.02 Unregistered sale of equity; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-23-094243 |
| 2023-08-15 | 08:14 ET | [10-K/A](/filings/0001104659-23-091716.md) | Annual report, amended, period 2022-10-02 | 0001104659-23-091716 |
| 2023-08-10 | 16:09 ET | [10-Q](/filings/0000831641-23-000039.md) | Quarterly report, period 2023-07-02 | 0000831641-23-000039 |
| 2023-08-09 | 16:27 ET | [8-K](/filings/0001104659-23-089328.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-23-089328 |
| 2023-05-11 | 16:10 ET | [10-Q](/filings/0000831641-23-000024.md) | Quarterly report, period 2023-04-02 | 0000831641-23-000024 |
| 2023-05-10 | 16:31 ET | [8-K](/filings/0001104659-23-058476.md) | 2.02 Results of operations; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-23-058476 |
| 2023-05-08 | 16:05 ET | [8-K](/filings/0001104659-23-057146.md) | 5.02 Departure or appointment of officers or directors | 0001104659-23-057146 |
| 2023-04-10 | 16:01 ET | [8-K/A](/filings/0001104659-23-043574.md) | 2.01 Completion of an acquisition or disposition; 9.01 Financial statements and exhibits | 0001104659-23-043574 |

Page 1 of 5. [Older](/companies/ttek/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 14:57 ET. No prices; not investment advice.