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TTEK · Tetra Tech Inc · Shareholders & Ownership

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$36.98 +0.17 (+0.46%)
Market Cap
$9.42B
Shares
256.04M
Volume · Oct 23 1.8M Avg daily vol (3M) 2.42M

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
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
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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.

Showing 1–50 of 775 holders

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Key facts CIK 831641 CUSIP 88162G103 13F (30d) 88 filings 87 filers Visit website Investor relations