Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in TTEK held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 26.8M | $806.9M | +4.1% | 10.272% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 12.6M | $380.8M | β | 4.848% | 0.02% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 11.7M | $352.7M | β | 4.490% | 0.01% |
| 4 | Capital International Investors | 11.4M | $342.9M | +26.3% | 4.365% | 0.08% |
| 5 | Pictet Asset Management Holding SA | 9.6M | $290.5M | -13.9% | 3.698% | 0.31% |
| 6 | STATE STREET CORP | 9.6M | $290.2M | +2.3% | 3.695% | 0.01% |
| 7 | Neuberger Berman Group LLC | 7.3M | $219.0M | -13.0% | 2.787% | 0.17% |
| 8 | SANDS CAPITAL MANAGEMENT, LLC | 6.7M | $200.6M | -5.0% | 2.553% | 0.79% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 5.2M | $157.2M | +2.7% | 2.000% | 0.01% |
| 10 | FIL Ltd | 4.8M | $145.6M | +3.5% | 1.853% | 0.11% |
| 11 | WELLINGTON MANAGEMENT GROUP LLP | 4.8M | $144.7M | +355.2% | 1.842% | 0.03% |
| 12 | Amundi | 4.7M | $143.1M | -6.8% | 1.821% | 0.04% |
| 13 | Impax Asset Management Group plc | 3.8M | $115.4M | +19.4% | 1.468% | 0.80% |
| 14 | DIMENSIONAL FUND ADVISORS LP | 3.8M | $114.1M | +3.1% | 1.453% | 0.02% |
| 15 | FERNBRIDGE CAPITAL MANAGEMENT LP | 3.4M | $102.4M | +10.9% | 1.304% | 6.56% |
| 16 | FULLER & THALER ASSET MANAGEMENT, INC. | 3.3M | $99.8M | β | 1.271% | 0.34% |
| 17 | LGT Group Foundation | 3.2M | $95.2M | +3.3% | 1.212% | 1.16% |
| 18 | ALLIANCEBERNSTEIN L.P. | 2.8M | $94.2M | -8.8% | 1.076% | 0.03% |
| 19 | Invesco Ltd. | 2.9M | $88.4M | +14.2% | 1.125% | 0.01% |
| 20 | Ninety One UK Ltd | 2.7M | $82.3M | -2.5% | 1.047% | 0.19% |
| 21 | FIRST TRUST ADVISORS LP | 2.4M | $73.7M | +47.6% | 0.938% | 0.05% |
| 22 | Bank of New York Mellon Corp | 2.3M | $70.7M | -0.3% | 0.901% | 0.01% |
| 23 | NORTHERN TRUST CORP | 2.3M | $69.9M | -1.3% | 0.890% | 0.01% |
| 24 | M&G Plc | 2.3M | $69.6M | -3.6% | 0.889% | 0.36% |
| 25 | Robeco Schweiz AG | 2.3M | $68.9M | -2.5% | 0.877% | 1.46% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in TTEK β a direct measure of their conviction.
Filings activity in TTEK during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new TTEK position in Q1 2026
Institutions that fully closed their TTEK position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 572 | 4.0% | 94.14% | 9.21 pp | $6.98B | 8.9% |
| Q4 2025 | 596 | +3.5% | 103.35% | 2.42 pp | $7.66B | 2.3% |
| Q3 2025 | 576 | +0.2% | 105.77% | 9.40 pp | $7.84B | 8.2% |
| Q2 2025 | 575 | +4.2% | 115.17% | +22.90 pp | $8.54B | +25% |
| Q1 2025 | 552 | 11% | 92.27% | 27.25 pp | $6.84B | 23% |
| Q4 2024 | 619 | 1.6% | 119.52% | 32.52 pp | $8.86B | 21% |
| Q3 2024 | 629 | +7.5% | 152.04% | +27.56 pp | $11.27B | +22% |
| Q2 2024 | 585 | β | 124.48% | β | $9.23B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying TTEK stock.
Based on Q1 2026 13F filings, institutional ownership of Tetra Tech, Inc. stands at 94.1%, held across 572 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of TTEK, with approximately 26,790,406 shares worth $0.81B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of TTEK.
Our composite Smart Money Score for TTEK is 21 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
78 institutions opened new positions in TTEK during Q1 2026, while 102 fully exited. 121 added to existing positions and 368 trimmed.
TTEK institutional ownership fell by 9.21 percentage points quarter-over-quarter, with a net change of -24 holders.
The top 10 institutions account for 45.6% of all reported 13F value in TTEK, and the top 25 account for 66.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Tetra Tech, Inc. (TTEK) Institutional Ownership