Who owns Tetra Tech (TTEK)
Which tracked institutional funds hold TTEK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See TTEK company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
97 tracked funds added or opened TTEK while 172 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
TTEK’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes TTEK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in TTEK divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 520 tracked filers holding TTEK, 239 increased or opened the position and 332 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in TTEK between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 16
- Energy Income Partners, LLC$69M
- COOKE & BIELER LP$52M
- ABSOLUTE INVESTMENT ADVISERS, LLC$18M
- SHENKMAN CAPITAL MANAGEMENT INC$9M
- Foresight Group Ltd Liability Partnership$8M
- MIZUHO SECURITIES USA LLC$7M
Full exits 61
- SANDS CAPITAL MANAGEMENT, LLC$201M
- Amundi$143M
- FERNBRIDGE CAPITAL MANAGEMENT LP$102M
- Van Berkom & Associates Inc.$69M
- BESSEMER GROUP INC$43M
- PGGM Investments$38M
Largest adds
- FMR LLC$245M
- BlackRock, Inc.$139M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$111M
- AQR CAPITAL MANAGEMENT LLC$72M
- FULLER & THALER ASSET MANAGEMENT, INC.$42M
- GEODE CAPITAL MANAGEMENT, LLC$40M
Largest trims
- Pictet Asset Management Holding SA$153M
- NEUBERGER BERMAN GROUP LLC$92M
- ALLIANCEBERNSTEIN L.P.$84M
- KING LUTHER CAPITAL MANAGEMENT CORP$37M
- MARSHALL WACE, LLP$21M
- VANGUARD PORTFOLIO MANAGEMENT LLC$21M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| TUDOR INVESTMENT CORP ET AL | 30,120,000 | $32M | 0.5% | 2026-Q2 |
| BlackRock, Inc. added | 28,675,276 | $828M | 12.8% | 2026-Q2 |
| ABSOLUTE INVESTMENT ADVISERS, LLC new | 17,226,000 | $18M | 0.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 12,467,970 | $360M | 5.6% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 11,725,738 | $339M | 5.2% | 2026-Q2 |
| Capital International Investors added | 11,651,238 | $337M | 5.2% | 2026-Q2 |
| STATE STREET CORP added | 9,761,640 | $282M | 4.3% | 2026-Q2 |
| FMR LLC added | 8,768,611 | $253M | 3.9% | 2026-Q2 |
| SHENKMAN CAPITAL MANAGEMENT INC new | 8,406,000 | $9M | 0.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 6,833,071 | $197M | 3.0% | 2026-Q2 |
| FIL Ltd added | 5,471,691 | $158M | 2.4% | 2026-Q2 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 4,921,268 | $142M | 2.2% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 4,759,290 | $137M | 2.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 4,674,089 | $135M | 2.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 4,446,215 | $128M | 2.0% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 4,408,987 | $127M | 2.0% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 4,393,728 | $127M | 2.0% | 2026-Q2 |
| Invesco Ltd. added | 4,116,893 | $119M | 1.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 4,111,603 | $117M | 1.8% | 2026-Q2 |
| Impax Asset Management Group plc added | 3,931,741 | $114M | 1.8% | 2026-Q2 |
| LGT Group Foundation added | 3,745,171 | $108M | 1.7% | 2026-Q2 |
| NORGES BANK added | 3,230,988 | $93M | 1.4% | 2026-Q2 |
| Robeco Schweiz AG added | 3,099,250 | $90M | 1.4% | 2026-Q2 |
| M&G PLC added | 2,776,344 | $81M | 1.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 2,729,762 | $79M | 1.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,647,910 | $76M | 1.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 2,561,572 | $74M | 1.1% | 2026-Q2 |
| Energy Income Partners, LLC new | 2,371,465 | $69M | 1.1% | 2026-Q2 |
| Ninety One UK Ltd trimmed | 2,365,261 | $68M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,286,390 | $66M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 2,245,716 | $65M | 1.0% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 2,101,030 | $61M | 0.9% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 2,081,631 | $60M | 0.9% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 1,977,679 | $57M | 0.9% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,966,257 | $57M | 0.9% | 2026-Q2 |
| UBS Group AG added | 1,867,963 | $54M | 0.8% | 2026-Q2 |
| AVIVA PLC trimmed | 1,842,517 | $53M | 0.8% | 2026-Q2 |
| COOKE & BIELER LP new | 1,785,403 | $52M | 0.8% | 2026-Q2 |
| Allianz Asset Management GmbH trimmed | 1,728,565 | $52M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 1,643,323 | $47M | 0.7% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 1,558,916 | $45M | 0.7% | 2026-Q2 |
| Corient Private Wealth LP added | 1,556,394 | $45M | 0.7% | 2026-Q2 |
| NEUMEIER POMA INVESTMENT COUNSEL LLC added | 1,514,378 | $44M | 0.7% | 2026-Q2 |
| MANAGED ASSET PORTFOLIOS, LLC added | 1,321,714 | $38M | 0.6% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 1,287,534 | $37M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,136,843 | $33M | 0.5% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 1,106,392 | $32M | 0.5% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 1,103,758 | $32M | 0.5% | 2026-Q2 |
| Aberdeen Group plc trimmed | 1,068,968 | $31M | 0.5% | 2026-Q2 |
| Capital Research Global Investors trimmed | 1,020,653 | $29M | 0.5% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 1,011,149 | $29M | 0.5% | 2026-Q2 |
| Nuveen, LLC added | 967,569 | $28M | 0.4% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT CO LTD added | 954,294 | $28M | 0.4% | 2026-Q2 |
| Legal & General Group Plc added | 945,909 | $27M | 0.4% | 2026-Q2 |
| L1 Capital International Pty Ltd trimmed | 925,433 | $27M | 0.4% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 887,837 | $26M | 0.4% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 841,158 | $24M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 833,747 | $24M | 0.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 767,634 | $22M | 0.3% | 2026-Q2 |
| Robeco Institutional Asset Management B.V. added | 743,831 | $21M | 0.3% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 712,884 | $21M | 0.3% | 2026-Q2 |
| Gotham Asset Management, LLC added | 708,634 | $20M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 693,805 | $20M | 0.3% | 2026-Q2 |
| MIROVA added | 669,611 | $19M | 0.3% | 2026-Q2 |
| TRILLIUM ASSET MANAGEMENT, LLC added | 647,910 | $19M | 0.3% | 2026-Q2 |
| Fisher Asset Management, LLC added | 647,795 | $19M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 641,945 | $19M | 0.3% | 2026-Q2 |
| BANK OF NOVA SCOTIA added | 629,088 | $18M | 0.3% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 628,625 | $18M | 0.3% | 2026-Q2 |
| Bridgewater Associates, LP added | 608,211 | $18M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 589,240 | $17M | 0.3% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 578,614 | $17M | 0.3% | 2026-Q2 |
| KING LUTHER CAPITAL MANAGEMENT CORP trimmed | 569,160 | $16M | 0.3% | 2026-Q2 |
| California Public Employees Retirement System added | 528,661 | $15M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 497,200 | $14M | 0.2% | 2026-Q2 |
| Ninety One North America, Inc. added | 485,767 | $14M | 0.2% | 2026-Q2 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP added | 481,101 | $14M | 0.2% | 2026-Q2 |
| Sarasin & Partners LLP added | 472,902 | $14M | 0.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 456,640 | $13M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 440,903 | $13M | 0.2% | 2026-Q2 |
| one8zero8, LLC trimmed | 440,672 | $13M | 0.2% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 428,289 | $12M | 0.2% | 2026-Q2 |
| Perpetual Ltd added | 426,947 | $12M | 0.2% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 419,712 | $12M | 0.2% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 415,099 | $12M | 0.2% | 2026-Q2 |
| NICOLA WEALTH MANAGEMENT LTD. | 411,000 | $12M | 0.2% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 401,964 | $12M | 0.2% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 373,426 | $11M | 0.2% | 2026-Q2 |
| Osprey Private Wealth LLC trimmed | 363,295 | $10M | 0.2% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP added | 352,058 | $10M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 335,361 | $10M | 0.2% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC added | 334,455 | $10M | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 319,600 | $9M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 305,545 | $9M | 0.1% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 301,601 | $9M | 0.1% | 2026-Q2 |
| Renaissance Investment Group LLC trimmed | 293,841 | $8M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 289,716 | $8M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 279,367 | $8M | 0.1% | 2026-Q2 |
| Man Group plc added | 279,108 | $8M | 0.1% | 2026-Q2 |
| Public Sector Pension Investment Board added | 277,517 | $8M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.