TTEK · Tetra Tech Inc · Shareholders & Ownership
Key customers — 37% of revenue (fiscal 2025)
“Approximately 32%, 14%, 17% and 37% of our fiscal 2025 revenue was generated from our U.S. federal government, U.S. state and local government, U.S. commercial and international clients, respectively.”
Key customers — 32% of revenue (fiscal 2025)
“Approximately 32%, 14%, 17% and 37% of our fiscal 2025 revenue was generated from our U.S. federal government, U.S. state and local government, U.S. commercial and international clients, respectively.”
Key customers — 17% of revenue (fiscal 2025)
“Approximately 32%, 14%, 17% and 37% of our fiscal 2025 revenue was generated from our U.S. federal government, U.S. state and local government, U.S. commercial and international clients, respectively.”
Key customers — 14% of revenue (fiscal 2025)
“Approximately 32%, 14%, 17% and 37% of our fiscal 2025 revenue was generated from our U.S. federal government, U.S. state and local government, U.S. commercial and international clients, respectively.”
Key customers — 27% of receivables (fiscal 2025 year-end)
“Approximately 27% of accounts receivable were due from various agencies of the U.S. federal government at fiscal 2025 year-end.”
Every disclosed holder of TTEK in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns TTEK
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 252,677,932 | 98.69% |
| Insiders (Forms 3, 4, 5) | 1,312,336 | 0.51% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 2,054,160 | 0.80% |
| Registered funds (N-PORT, not summed) | 97,370,667 | 38.03% |
Shares outstanding: 256,044,428, the issuer's latest cover-page count restated onto today's split basis.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of TTEK
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
28,675,276 | ||
| 1.1 |
iShares Core S&P Mid-Cap ETF
Fund
S000004307 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
8,882,305 | ||
| 1.2 |
iShares S&P Mid-Cap 400 Growth ETF
Fund
S000004308 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,553,562 | ||
| 1.3 |
iShares Russell Mid-Cap ETF
Fund
S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,076,017 | ||
| 1.4 |
iShares Russell 1000 Value ETF
Fund
S000004345 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
581,688 | ||
| 1.5 |
iShares U.S. Infrastructure ETF
Fund
S000061314 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
419,074 | ||
| 2 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
12,467,970 | ||
| 3 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
11,725,738 | ||
| 4 |
Capital International Investors
13F
CIK 1562230 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
11,651,238 | ||
| 5 |
|
9,761,640 | ||
| 5.1 |
State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF
Fund
S000006986 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,313,681 | ||
| 5.2 |
State Street(R) SPDR(R) S & P 400(TM) Mid Cap Growth ETF
Fund
S000006987 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
401,319 | ||
| 5.3 |
State Street U.S. Core Equity Fund
Fund
S000071466 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
341,973 | ||
| 5.4 |
State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF
Fund
S000063362 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
112,084 | ||
| 5.5 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
91,210 | ||
| 6 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8,768,611 | ||
| 6.1 |
Fidelity Series Value Discovery Fund
Fund
S000039216 · Registered fund · Jul 31, 2026
Fidelity Devonshire Trust, not summed
|
3,016,200 | ||
| 6.2 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
1,344,084 | ||
| 6.3 |
Fidelity Mid Cap Index Fund
Fund
S000033637 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
984,921 | ||
| 6.4 |
Strategic Advisers Fidelity U.S. Total Stock Fund
Fund
S000061481 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
|
857,700 | ||
| 6.5 |
Fidelity Value Discovery Fund
Fund
S000007154 · Registered fund · Jul 31, 2026
Fidelity Puritan Trust, not summed
|
711,200 | ||
| 7 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
8,249,188 | ||
| 8 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,833,071 | ||
| 9 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
5,954,009 | ||
| 10 |
FIL Ltd
13F
CIK 318989 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,471,691 | ||
| 11 |
Amundi
13F
CIK 1330387 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,098,519 | ||
| 11.1 |
KBI GLOBAL INVESTORS AQUARIUS FUND
Fund
S000063187 · Registered fund · Jul 31, 2026
ADVISORS' INNER CIRCLE III, not summed
|
30,710 | ||
| 12 |
FULLER & THALER ASSET MANAGEMENT, INC.
13F
CIK 1082327 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,921,268 | ||
| 13 |
Pictet Asset Management Holding SA
13F
CIK 1993888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,759,290 | ||
| 14 |
FULLERTHALER BEHAVIORAL SMALL CAP EQUITY
Fund
S000051163 · Registered fund · Jun 30, 2026
Capitol Series Trust, not summed
|
4,701,700 | ||
| 15 |
WELLINGTON MANAGEMENT GROUP LLP
13F
CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,674,089 | ||
| 16 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,446,215 | ||
| 16.1 |
Dimensional U.S. Small Cap ETF
Fund
S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
772,190 | ||
| 16.2 |
U.S. SMALL CAP PORTFOLIO
Fund
S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
740,438 | ||
| 16.3 |
Dimensional U.S. Core Equity 2 ETF
Fund
S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
454,670 | ||
| 16.4 |
U.S. CORE EQUITY 2 PORTFOLIO
Fund
S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
344,745 | ||
| 16.5 |
U.S. CORE EQUITY 1 PORTFOLIO
Fund
S000000979 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
300,592 | ||
| 17 |
NEUBERGER BERMAN GROUP LLC
13F
CIK 1465109 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,408,987 | ||
| 18 |
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F
CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,393,728 | ||
| 19 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,116,893 | ||
| 19.1 |
Invesco S&P MidCap Quality ETF
Fund
S000013108 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
1,784,523 | ||
| 19.2 |
Invesco Water Resources ETF
Fund
S000003048 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
1,489,539 | ||
| 19.3 |
Invesco S&P MidCap 400 GARP ETF
Fund
S000060794 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
239,227 | ||
| 19.4 |
Invesco S&P MidCap 400 Revenue ETF
Fund
S000064595 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
73,256 | ||
| 19.5 |
Invesco S&P Midcap 400 Pure Growth ETF
Fund
S000060795 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
48,765 | ||
| 20 |
AQR CAPITAL MANAGEMENT LLC
13F
CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,111,603 | ||
| 20.1 |
AQR Style Premia Alternative Fund
Fund
S000042050 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
111,911 | ||
| 20.2 |
AQR Large Cap Multi-Style Fund
Fund
S000040063 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
55,261 | ||
| 20.3 |
AQR Multi-Asset Fund
Fund
S000029959 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
51,012 | ||
| 20.4 |
AQR Alternative Risk Premia Fund
Fund
S000058563 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
39,711 | ||
| 20.5 |
AQR MS Fusion HV Fund
Fund
S000093174 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
4,098 | ||
| 21 |
New Perspective Fund
Fund
S000009613 · Registered fund · Jun 30, 2026
New Perspective Fund, not summed
|
4,068,579 | ||
| 22 |
Impax Asset Management Group plc
13F
CIK 1749768 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,931,741 | ||
| 23 |
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund
S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
3,770,313 | ||
| 24 |
LGT Group Foundation
13F
CIK 1911278 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,745,171 | ||
| 25 |
SMALLCAP World Fund Inc
Fund
S000009599 · Registered fund · Jun 30, 2026
SMALLCAP World Fund Inc, not summed
|
3,483,194 | ||
| 26 |
NORGES BANK
13F
CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,230,988 | ||
| 27 |
Robeco Schweiz AG
13F
CIK 1418427 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,099,250 | ||
| 28 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,977,514 | ||
| 29 |
M&G PLC
13F
CIK 1802539 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,776,344 | ||
| 30 |
AMERIPRISE FINANCIAL INC
13F
CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,729,762 | ||
| 30.1 |
Columbia Mid Cap Index Fund
Fund
S000010826 · Registered fund · May 31, 2026
COLUMBIA FUNDS SERIES TRUST, not summed
|
186,285 | ||
| 30.2 |
Columbia Research Enhanced Core ETF
Fund
S000066076 · Registered fund · Jul 31, 2026
Columbia ETF Trust I, not summed
|
111,519 | ||
| 30.3 |
Columbia Research Enhanced Value ETF
Fund
S000066077 · Registered fund · Jul 31, 2026
Columbia ETF Trust I, not summed
|
9,372 | ||
| 30.4 |
Columbia Global Opportunities Fund
Fund
S000031367 · Registered fund · Jul 31, 2026
Columbia Funds Series Trust II, not summed
|
4,183 | ||
| 30.5 |
Columbia Research Enhanced Mid Cap ETF
Fund
S000095312 · Registered fund · Jun 30, 2026
Columbia ETF Trust I, not summed
|
212 | ||
| 31 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,647,910 | ||
| 31.1 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
|
27,190 | ||
| 31.2 |
Goldman Sachs MarketBeta U.S. 1000 Equity ETF
Fund
S000075322 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust II, not summed
|
8,874 | ||
| 31.3 |
Goldman Sachs MarketBeta(R) Russell 1000 Value Equity ETF
Fund
S000083006 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
2,612 | ||
| 31.4 |
Goldman Sachs MarketBeta(R) Russell 1000 Growth Equity ETF
Fund
S000083005 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
856 | ||
| 32 |
FIRST TRUST ADVISORS LP
13F
CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,561,572 | ||
| 32.1 |
First Trust North American Energy Infrastructure Fund
Fund
S000033458 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded Fund IV, not summed
|
1,680,189 | ||
| 32.2 |
First Trust Water ETF
Fund
S000017178 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
|
1,609,682 | ||
| 32.3 |
FT Energy Income Partners Enhanced Income ETF
Fund
S000083823 · Registered fund · May 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
|
400,000 | ||
| 32.4 |
First Trust Industrials/Producer Durables AlphaDEX Fund
Fund
S000017701 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
172,590 | ||
| 32.5 |
FT Energy Income Partners Strategy ETF
Fund
S000077877 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded Fund IV, not summed
|
134,473 | ||
| 33 |
Van Berkom & Associates Inc.
13F
CIK 1524408 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,469,392 | ||
| 34 |
Energy Income Partners, LLC
13F
CIK 1388814 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,371,465 | ||
| 34.1 |
EIP Growth and Income Fund
Fund
S000013896 · Registered fund · Jul 31, 2026
EIP Investment Trust, not summed
|
36,300 | ||
| 35 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,286,390 | ||
| 35.1 |
Schwab U.S. Mid-Cap ETF
Fund
S000026635 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
704,129 | ||
| 35.2 |
Schwab Fundamental U.S. Small Company ETF
Fund
S000040878 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
435,727 | ||
| 35.3 |
Schwab U.S. Large-Cap ETF
Fund
S000026632 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
279,836 | ||
| 35.4 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
160,974 | ||
| 35.5 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
156,522 | ||
| 36 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,245,716 | ||
| 36.1 |
Mid Cap Index Fund
Fund
S000001273 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
168,682 | ||
| 36.2 |
Multi-Manager Global Listed Infrastructure Fund
Fund
S000037667 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
17,282 | ||
| 36.3 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
7,110 | ||
| 37 |
Growth Fund
Fund
S000008791 · Registered fund · Jun 30, 2026
AMERICAN FUNDS INSURANCE SERIES, not summed
|
2,192,104 | ||
| 38 |
Ninety One UK Ltd
13F
CIK 1418329 · Registered investment adviser · Sep 30, 2026
|
2,190,825 | ||
| 39 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,101,030 | ||
| 39.1 |
BNY Mellon US Mid Cap Core Equity ETF
Fund
S000067261 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
|
40,557 | ||
| 40 |
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
13F
CIK 1705339 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,081,631 | ||
| 40.1 |
Global X U.S. Infrastructure Development ETF
Fund
S000056509 · Registered fund · May 31, 2026
GLOBAL X FUNDS, not summed
|
1,914,460 | ||
| 41 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,977,679 | ||
| 42 |
Allianz Asset Management GmbH
13F
CIK 1535323 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,976,969 | ||
| 43 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,966,257 | ||
| 43.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
353 | ||
| 44 |
PGGM Investments
13F
CIK 1472190 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,874,895 | ||
| 45 |
|
1,867,963 | ||
| 46 |
AVIVA PLC
13F
CIK 1140022 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,842,517 | ||
| 47 |
Growth Fund of America
Fund
S000009228 · Registered fund · May 31, 2026
Growth Fund of America, not summed
|
1,647,990 | ||
| 48 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,643,323 | ||
| 49 |
DEUTSCHE BANK AG\
13F
CIK 948046 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,558,916 | ||
| 49.1 |
Xtrackers Russell US Multifactor ETF
Fund
S000048521 · Registered fund · Aug 31, 2026
DBX ETF Trust, not summed
|
5,403 | ||
| 50 |
Corient Private Wealth LLC
13F
CIK 1948780 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,554,196 |
96 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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