Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
572 institutional managers reported holding TTEK for the quarter ended Mar 31, 2026. Together they hold about 93% of shares outstanding; the top 10 hold 43%. 66 opened new positions; 95 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 26.79M | 10.23% | $806.9M | added +4.1% | ≤2013 |
| Vanguard Group | 26.37M | 10.07% | $794.3M | added +2.1% | ≤2013 |
| Capital International Investors | 11.39M | 4.35% | $342.9M | added +26.3% | 2024 Q4 |
| Pictet Asset Management Holding SA | 9.64M | 3.68% | $290.5M | trimmed -13.9% | 2018 Q2 |
| State Street | 9.64M | 3.68% | $290.2M | added +2.2% | ≤2013 |
| Neuberger Berman Group LLC | 7.27M | 2.78% | $219.0M | trimmed -13% | ≤2013 |
| Sands Capital | 6.66M | 2.54% | $200.6M | trimmed -5% | 2024 Q4 |
| Geode Capital | 5.22M | 1.99% | $157.1M | added +2.7% | ≤2013 |
| FIL LTD | 4.83M | 1.84% | $145.6M | added +3.5% | 2018 Q4 |
| Wellington Management | 4.80M | 1.83% | $144.7M | added +355.2% | 2017 Q2 |
| Amundi | 4.75M | 1.81% | $143.0M | trimmed -6.8% | 2019 Q3 |
| Impax Asset Management Group plc | 3.83M | 1.46% | $115.4M | added +19.4% | 2025 Q4 |
| Dimensional Fund Advisors | 3.79M | 1.45% | $114.1M | added +3.1% | ≤2013 |
| Fernbridge Capital Management LP (focused) | 3.40M | 1.30% | $102.4M | added +10.9% | 2025 Q2 |
| Fuller & Thaler Asset Management, INC. | 3.31M | 1.26% | $99.8M | opened | 2026 Q1 |
| LGT Group Foundation | 3.16M | 1.21% | $95.2M | added +3.3% | 2024 Q1 |
| Robeco Institutional Asset Management B.v. | 2.99M | 1.14% | $90.2M | trimmed -3% | 2022 Q2 |
| Invesco | 2.93M | 1.12% | $88.4M | added +14.2% | ≤2013 |
| AllianceBernstein | 2.81M | 1.07% | $84.6M | trimmed -8.8% | ≤2013 |
| Ninety One UK LTD | 2.73M | 1.04% | $82.3M | trimmed -2.5% | 2024 Q2 |
| First Trust Advisors LP | 2.45M | 0.93% | $73.7M | added +47.6% | 2014 Q2 |
| BNY Mellon | 2.35M | 0.90% | $70.7M | unchanged | ≤2013 |
| Northern Trust | 2.32M | 0.89% | $69.9M | trimmed -1.3% | ≤2013 |
| M&G PLC | 2.32M | 0.89% | $69.8M | trimmed -3.6% | 2024 Q4 |
| Van Berkom & Associates INC. | 2.29M | 0.87% | $68.8M | unchanged | 2025 Q1 |
| Morgan Stanley | 2.24M | 0.85% | $67.5M | trimmed -3.5% | ≤2013 |
| Charles Schwab Investment Management | 2.24M | 0.85% | $67.4M | added +3.6% | ≤2013 |
| Ameriprise Financial INC | 2.02M | 0.77% | $60.9M | trimmed -22.7% | ≤2013 |
| Aviva PLC | 1.93M | 0.74% | $58.0M | trimmed -5.5% | 2021 Q3 |
| Goldman Sachs | 1.93M | 0.74% | $58.0M | added +24% | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 1.92M | 0.73% | $57.8M | added +5.1% | 2018 Q3 |
| UBS | 1.79M | 0.69% | $54.1M | unchanged | ≤2013 |
| King Luther Capital Management CORP | 1.79M | 0.68% | $53.8M | added +12.2% | 2024 Q2 |
| Citadel Advisors | 1.74M | 0.67% | $52.4M | added +3341% | 2020 Q4 |
| Deutsche Bank AG\ | 1.73M | 0.66% | $52.2M | added +25.1% | ≤2013 |
| Allianz Asset Management GmbH | 1.73M | 0.66% | $52.1M | added +9% | 2016 Q4 |
| Quantinno Capital Management LP | 1.55M | 0.59% | $46.7M | added +2.2% | 2024 Q2 |
| AQR Capital | 1.51M | 0.58% | $45.6M | trimmed -47.3% | 2015 Q4 |
| Bessemer Group INC | 1.43M | 0.55% | $43.1M | added +2.6% | ≤2013 |
| Aberdeen Group plc | 1.42M | 0.54% | $42.8M | trimmed -5.1% | 2020 Q1 |
| Corient Private Wealth LLC | 1.39M | 0.53% | $41.9M | trimmed -13.1% | 2022 Q4 |
| Bank OF America CORP /DE/ | 1.37M | 0.52% | $41.3M | trimmed -32.1% | ≤2013 |
| Neumeier Poma Investment Counsel LLC (focused) | 1.30M | 0.50% | $39.3M | added +15.7% | 2018 Q1 |
| Pggm Investments | 1.25M | 0.48% | $37.8M | trimmed -9.2% | 2024 Q2 |
| Capital Research Global Investors | 1.10M | 0.42% | $33.2M | trimmed -37.9% | 2025 Q2 |
| Janus Henderson | 1.03M | 0.39% | $31.0M | trimmed -47.5% | 2021 Q3 |
| L1 Capital International Pty LTD (focused) | 956.2k | 0.36% | $28.8M | opened | 2026 Q1 |
| Pacer Advisors, INC. | 948.5k | 0.36% | $28.6M | trimmed -1.2% | 2020 Q3 |
| Nuveen | 936.4k | 0.36% | $28.2M | trimmed -23% | ≤2013 |
| Legal & General Group PLC | 913.8k | 0.35% | $27.5M | added +138.4% | ≤2013 |
Largest 50 of 572 shown; the full ranked, searchable register is at boothcheck.com/holders/TTEK. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.