TETRA TECH INC (TTEK) Top Institutional Shareholders
TETRA TECH INC (TTEK) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $6.98B in TTEK holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of TTEK tracked by InsiderSet, reporting ownership valued at approximately $806.93M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $753.35M, representing an estimated loss of -6.64% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 46% of the total disclosed TTEK value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in TETRA TECH INC (TTEK).
This page ranks the largest institutional TTEK shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
579
Total Reported Value
$6.98B
Largest Holder
Blackrock, Inc.
Largest Position
$806.93M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
50
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 26,790,406 | $806,927,023 | $753,346,217 | -$53,580,806 | -6.64% | |
| Vanguard Portfolio Management Llc | 0.02% | 12,643,094 | $380,809,991 | $355,523,803 | -$25,286,188 | -6.64% | |
| Vanguard Capital Management Llc | 0.01% | 11,709,151 | $352,679,628 | $329,261,326 | -$23,418,302 | -6.64% | |
| Capital International Investors | 0.08% | 11,385,267 | $342,924,242 | $320,153,708 | -$22,770,534 | -6.64% | |
| Pictet Asset Management Holding Sa | 0.31% | 9,644,792 | $290,487,546 | $271,211,551 | -$19,275,995 | -6.64% | |
| State Street Corp | 0.01% | 9,635,912 | $290,233,669 | $270,961,845 | -$19,271,824 | -6.64% | |
| Neuberger Berman Group Llc | 0.17% | 7,269,657 | $218,962,082 | $204,422,755 | -$14,539,327 | -6.64% | |
| Sands Capital Management, Llc | 0.79% | 6,658,823 | $200,563,749 | $187,246,103 | -$13,317,646 | -6.64% | |
| Geode Capital Management, Llc | 0.01% | 5,217,448 | $157,185,669 | $146,714,638 | -$10,471,031 | -6.66% | |
| Fil Ltd | 0.11% | 4,832,672 | $145,560,081 | $135,894,737 | -$9,665,344 | -6.64% | |
| Wellington Management Group Llp | 0.03% | 4,804,049 | $144,697,957 | $135,089,858 | -$9,608,099 | -6.64% | |
| Amundi | 0.04% | 4,749,247 | $143,061,971 | $133,548,826 | -$9,513,145 | -6.65% | |
| Impax Asset Management Group Plc | 0.80% | 3,830,074 | $115,361,829 | $107,701,681 | -$7,660,148 | -6.64% | |
| Dimensional Fund Advisors Lp | 0.02% | 3,789,240 | $114,128,467 | $106,553,429 | -$7,575,038 | -6.64% | |
| Fernbridge Capital Management Lp | 6.56% | 3,400,775 | $102,431,343 | $95,629,793 | -$6,801,550 | -6.64% | |
| Fuller & Thaler Asset Management, Inc. | 0.34% | 3,314,443 | $99,831,025 | $93,202,137 | -$6,628,888 | -6.64% | |
| Lgt Group Foundation | 1.16% | 3,161,708 | $95,230,645 | $88,907,229 | -$6,323,416 | -6.64% | |
| Alliancebernstein L.P. | 0.03% | 2,807,465 | $94,162,376 | $78,945,916 | -$15,216,460 | -16.16% | |
| Invesco Ltd. | 0.01% | 2,934,900 | $88,399,200 | $82,529,388 | -$5,869,812 | -6.64% | |
| Ninety One Uk Ltd | 0.19% | 2,731,721 | $82,279,416 | $76,815,995 | -$5,463,421 | -6.64% | |
| First Trust Advisors Lp | 0.05% | 2,445,482 | $73,657,890 | $68,766,954 | -$4,890,936 | -6.64% | |
| Bank Of New York Mellon Corp | 0.01% | 2,348,637 | $70,740,951 | $66,043,672 | -$4,697,279 | -6.64% | |
| Northern Trust Corp | 0.01% | 2,320,311 | $69,887,767 | $65,247,145 | -$4,640,622 | -6.64% | |
| M&G Plc | 0.36% | 2,318,534 | $69,556,020 | $65,197,176 | -$4,358,844 | -6.27% | |
| Robeco Schweiz Ag | 1.46% | 2,287,250 | $68,891,970 | $64,317,470 | -$4,574,500 | -6.64% | |
| Morgan Stanley | 0.00% | 2,239,504 | $67,453,924 | $62,974,852 | -$4,479,072 | -6.64% | |
| Charles Schwab Investment Management Inc | 0.01% | 2,237,257 | $67,386,181 | $62,911,667 | -$4,474,514 | -6.64% | |
| Ameriprise Financial Inc | 0.01% | 2,020,925 | $60,870,260 | $56,828,411 | -$4,041,849 | -6.64% | |
| Aviva Plc | 0.10% | 1,926,795 | $58,035,065 | $54,181,475 | -$3,853,590 | -6.64% | |
| Goldman Sachs Group Inc | 0.01% | 1,926,668 | $58,031,235 | $54,177,904 | -$3,853,331 | -6.64% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.08% | 1,918,681 | $57,789,704 | $53,953,310 | -$3,836,394 | -6.64% | |
| King Luther Capital Management Corp | 0.23% | 1,785,465 | $53,778,206 | $50,207,276 | -$3,570,930 | -6.64% | |
| Citadel Advisors Llc | 0.04% | 1,740,911 | $52,436,239 | $48,954,417 | -$3,481,822 | -6.64% | |
| Deutsche Bank Ag\ | 0.02% | 1,733,696 | $52,218,923 | $48,751,532 | -$3,467,391 | -6.64% | |
| Allianz Asset Management Gmbh | 0.06% | 1,730,038 | $52,108,744 | $48,648,669 | -$3,460,075 | -6.64% | |
| Vanguard Fiduciary Trust Co | 0.01% | 1,628,344 | $49,045,721 | $45,789,033 | -$3,256,688 | -6.64% | |
| Quantinno Capital Management Lp | 0.08% | 1,551,176 | $46,721,432 | $43,619,069 | -$3,102,363 | -6.64% | |
| Aqr Capital Management Llc | 0.02% | 1,514,462 | $45,449,013 | $42,586,671 | -$2,862,342 | -6.30% | |
| Aberdeen Group Plc | 0.07% | 1,422,213 | $42,837,056 | $39,992,630 | -$2,844,426 | -6.64% | |
| Corient Private Wealth Llc | 0.06% | 1,389,823 | $41,810,478 | $39,081,823 | -$2,728,655 | -6.53% | |
| Bank Of America Corp | 0.00% | 1,371,136 | $41,298,610 | $38,556,344 | -$2,742,266 | -6.64% | |
| Neumeier Poma Investment Counsel Llc | 3.24% | 1,303,913 | $39,273,860 | $36,666,034 | -$2,607,826 | -6.64% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.01% | 1,148,269 | $34,585,862 | $32,289,324 | -$2,296,538 | -6.64% | |
| Capital Research Global Investors | 0.01% | 1,102,450 | $33,205,794 | $31,000,894 | -$2,204,900 | -6.64% | |
| Janus Henderson Group Plc | 0.02% | 1,029,853 | $31,024,292 | $28,959,466 | -$2,064,826 | -6.66% | |
| L1 Capital International Pty Ltd | 1.72% | 956,166 | $28,799,720 | $26,887,388 | -$1,912,332 | -6.64% | |
| Nuveen, Llc | 0.01% | 936,404 | $28,204,489 | $26,331,680 | -$1,872,809 | -6.64% | |
| Legal & General Group Plc | 0.01% | 913,770 | $27,522,752 | $25,695,212 | -$1,827,540 | -6.64% | |
| Managed Asset Portfolios, Llc | 3.20% | 886,859 | $26,712,181 | $24,938,475 | -$1,773,706 | -6.64% | |
| Wells Fargo & Company/Mn | 0.01% | 880,796 | $26,529,576 | $24,767,984 | -$1,761,592 | -6.64% |
Frequently asked questions about TTEK
Who owns the most TTEK stock?
The largest holders of TTEK are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for TETRA TECH INC (TTEK).
Is TTEK widely held by superinvestors?
Many widely followed stocks like TTEK appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly TTEK is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.