| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2024-02-14 | ALLIANCEBERNSTEIN L.P. | TETRA TECH INC | 2,637,734 | 5.0% | EDGAR |
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | TETRA TECH INC | 5,153,853 | 9.7% | EDGAR |
| SC 13G | 2024-01-31 | PICTET ASSET MANAGEMENT SA | TETRA TECH INC | 278,970,200 | 5.2% | EDGAR |
| SC 13G/A | 2024-01-24 | BlackRock Inc. | TETRA TECH INC | 5,540,476 | 10.4% | EDGAR |
| SC 13G | 2023-02-14 | ALLIANCEBERNSTEIN L.P. | TETRA TECH INC | 2,955,535 | 5.6% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | TETRA TECH INC | 5,336,901 | 10.1% | EDGAR |
| SC 13G/A | 2023-02-07 | BlackRock Inc. | TETRA TECH INC | 5,730,208 | 10.8% | EDGAR |
| SC 13G | 2023-02-03 | PICTET ASSET MANAGEMENT SA | TETRA TECH INC | 2,722,397 | 5.1% | EDGAR |
| SC 13G/A | 2022-12-12 | VANGUARD GROUP INC | TETRA TECH INC | 5,326,891 | 10.0% | EDGAR |
| SC 13G/A | 2022-02-10 | VANGUARD GROUP INC | TETRA TECH INC | 5,241,701 | 9.7% | EDGAR |
| SC 13G | 2022-02-10 | PICTET ASSET MANAGEMENT SA | TETRA TECH INC | 2,786,629 | 5.2% | EDGAR |
| SC 13G/A | 2022-01-27 | BlackRock Inc. | TETRA TECH INC | 7,041,851 | 13.1% | EDGAR |
| SC 13G/A | 2022-01-25 | BlackRock Inc. | TETRA TECH INC | 7,041,851 | 13.1% | EDGAR |
| SC 13G/A | 2021-02-12 | DIMENSIONAL FUND ADVISORS LP | TETRA TECH INC | 1,805,138 | 1.4% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | TETRA TECH INC | 5,144,221 | 9.6% | EDGAR |
| SC 13G/A | 2021-01-27 | BlackRock Inc. | TETRA TECH INC | 6,728,577 | 12.5% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | TETRA TECH INC | 5,486,615 | 10.0% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | TETRA TECH INC | 6,793,943 | 12.4% | EDGAR |
| SC 13G/A | 2019-02-12 | VANGUARD GROUP INC | TETRA TECH INC | 5,703,476 | 10.3% | EDGAR |
| SC 13G/A | 2019-02-08 | DIMENSIONAL FUND ADVISORS LP | TETRA TECH INC | 2,353,519 | 4.2% | EDGAR |