Tetra Tech, Inc. (TTEK) ownership: Top institutional holder: VANGUARD GROUP INC ($865.35M). Insider activity: Net Seller (0 buys, 20 sells). 4 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 25800544.00 | $865.35M | 2025-12-31 |
| BlackRock, Inc. | 26790406.00 | $806.93M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 12643094.00 | $380.81M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 11709151.00 | $352.68M | 2026-03-31 |
| Capital International Investors | 11385267.00 | $342.92M | 2026-03-31 |
| Pictet Asset Management Holding SA | 9644792.00 | $290.49M | 2026-03-31 |
| STATE STREET CORP | 9635912.00 | $290.23M | 2026-03-31 |
| NEUBERGER BERMAN GROUP LLC | 7269657.00 | $218.96M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-04-27 | |
| Sell | null | 2026-03-16 | |
| Sell | null | 2026-03-16 | |
| Sell | null | 2026-03-16 | |
| Sell | null | 2026-03-16 | |
| Sell | null | 2026-03-16 | |
| Sell | null | 2026-03-16 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.