Tetra Tech Inc

TTEK

Exchange: Nasdaq
Industry: Services-Engineering Services
SEC CIK: 0000831641

SEC filings (opens in a new tab)

No open-market purchases or sales by Tetra Tech Inc insiders were filed in the last 90 days; 555 institutions reported holding it in 13F filings for Q2 2026, worth $7.32B in total; no superinvestor holds it.

13F holders, Q3 2026

Institutional positions in Tetra Tech Inc as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 3; 0 vs. Q2 2026
Shares held: 193.3K; +191.9K (+13,332.6%) vs. Q2 2026
Total value: $6.37M; +$6.33M (+15,226.3%) vs. Q2 2026
New holders: 0; 2 more added
Sold out: 0; 1 more reduced

552 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting TTEK on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding TTEK and their total value by quarter
Quarter	Holders	Value
Q2 2026	555	$7.32B
Q1 2026	593	$7.35B
Q4 2025	611	$8.10B
Q3 2025	597	$8.22B
Q2 2025	590	$8.94B
Q1 2025	568	$7.18B
Q4 2024	638	$9.45B
Q3 2024	646	$11.2B
Q2 2024	600	$9.88B
Q1 2024	512	$8.66B
Q4 2023	510	$7.87B
Q3 2023	471	$7.09B
Q2 2023	455	$7.67B
Q1 2023	445	$6.81B
Q4 2022	470	$6.68B
Q3 2022	412	$5.91B
Q2 2022	415	$6.31B
Q1 2022	404	$7.86B
Q4 2021	401	$7.93B
Q3 2021	359	$7.08B
Q2 2021	366	$5.68B
Q1 2021	365	$6.39B

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Tetra Tech Inc; share changes are against Q2 2026.

Institutions holding TTEK in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main	–	–	–	–	Not filed
Toroso Investments, LLC	–	–	–	–	Not filed
Daiwa Securities Group Inc.	–	–	–	–	Not filed
Fifth Third Bancorp	–	–	–	–	Not filed
Arizona State Retirement System	–	–	–	–	Not filed
Ameritas Investment Partners, Inc.	–	–	–	–	Not filed
Numerai GP LLC	–	–	–	–	Not filed
Capital International Inc	–	–	–	–	Not filed
Vanguard Investments Australia, Ltd.	–	–	–	–	Not filed
Worldquant Millennium Advisors LLC	–	–	–	–	Not filed
Commonwealth of Pennsylvania Public School Empls Retrmt Sys	–	–	–	–	Not filed
D'Orazio & Associates, Inc.	–	–	–	–	Not filed
Alps Advisors Inc	–	–	–	–	Not filed
State of Michigan Retirement System	–	–	–	–	Not filed
Icon Advisers Inc	–	–	–	–	Not filed
Northwestern Mutual Investment Management Company, LLC	–	–	–	–	Not filed
New Age Alpha Advisors, LLC	–	–	–	–	Not filed
Glenmede Trust Co NA	–	–	–	–	Not filed
Penserra Capital Management LLC	–	–	–	–	Not filed
Teacher Retirement System of Texas	–	–	–	–	Not filed
New Mexico Educational Retirement Board	–	–	–	–	Not filed
Oregon Public Employees Retirement Fund	–	–	–	–	Not filed
CBOE Vest Financial, LLC	–	–	–	–	Not filed
Exchange Traded Concepts, LLC	–	–	–	–	Not filed
Tributary Capital Management, LLC	–	–	–	–	Not filed
Engineers Gate Manager LP	–	–	–	–	Not filed
Hillsdale Investment Management Inc.	–	–	–	–	Not filed
South Dakota Investment Council	–	–	–	–	Not filed
Brevan Howard Capital Management LP	–	–	–	–	Not filed
Captrust Financial Advisors	–	–	–	–	Not filed
Davy Global Fund Management Ltd	–	–	–	–	Not filed
Regal Investment Advisors LLC	–	–	–	–	Not filed
Pathstone Holdings, LLC	–	–	–	–	Not filed
Franklin Resources Inc	–	–	–	–	Not filed
Victory Capital Management Inc	–	–	–	–	Not filed
Advisory Services Network, LLC	–	–	–	–	Not filed
Formula Growth Ltd	–	–	–	–	Not filed
Vancity Investment Management Ltd	–	–	–	–	Not filed
Natixis	–	–	–	–	Not filed
O'Shaughnessy Asset Management, LLC	–	–	–	–	Not filed
Evexia Wealth LLC	–	–	–	–	Not filed
Xponance, Inc.	–	–	–	–	Not filed
Oddo BHF Asset Management SAS	–	–	–	–	Not filed
Marshall Wace, LLP	–	–	–	–	Not filed
Natixis Advisors, L.P.	–	–	–	–	Not filed
Group One Trading, L.P.	–	–	–	–	Not filed
WCM Investment Management, LLC	–	–	–	–	Not filed
Atria Investments LLC	–	–	–	–	Not filed
Lazard Freres Gestion S.A.S.	–	–	–	–	Not filed
New York Life Investment Management LLC	–	–	–	–	Not filed
PFG Investments, LLC	–	–	–	–	Not filed
Summit Trail Advisors, LLC	–	–	–	–	Not filed
D.A. Davidson & Co.	–	–	–	–	Not filed
Caxton Associates LLP	–	–	–	–	Not filed
Kestra Investment Management, LLC	–	–	–	–	Not filed
Hunter Associates Investment Management LLC	–	–	–	–	Not filed
Penobscot Investment Management Company, Inc.	–	–	–	–	Not filed
Natural Investments, LLC	–	–	–	–	Not filed
Hunter Perkins Capital Management, LLC	–	–	–	–	Not filed
Inceptionr LLC	–	–	–	–	Not filed
Cetera Investment Advisers	–	–	–	–	Not filed
Ridge Creek Global, Inc	–	–	–	–	Not filed
Segall Bryant & Hamill, LLC	–	–	–	–	Not filed
Sumitomo Mitsui DS Asset Management Company, Ltd	–	–	–	–	Not filed
Public Employees Retirement Association of Colorado	–	–	–	–	Not filed
Capital Group Investment Management Pte. Ltd.	–	–	–	–	Not filed
State of Alaska, Department of Revenue	–	–	–	–	Not filed
JustInvest LLC	–	–	–	–	Not filed
Bailard, Inc.	–	–	–	–	Not filed
Perigon Wealth Management, LLC	–	–	–	–	Not filed
Harbour Investments, Inc.	–	–	–	–	Not filed
The PNC Financial Services Group, Inc.	–	–	–	–	Not filed
CenterBook Partners LP	–	–	–	–	Not filed
Legacy Wealth Asset Management, LLC	–	–	–	–	Not filed
Cullen Capital Management LLC	–	–	–	–	Not filed
M&T Bank Corp	–	–	–	–	Not filed
Zions Bancorporation, National Association	–	–	–	–	Not filed
Federated Hermes, Inc.	–	–	–	–	Not filed
Coldstream Capital Management Inc	–	–	–	–	Not filed
State of Wyoming	–	–	–	–	Not filed
Baird Financial Group, Inc.	–	–	–	–	Not filed
CAPROCK Group, Inc.	–	–	–	–	Not filed
First Wilshire Securities Management Inc	–	–	–	–	Not filed
Securian Asset Management, Inc	–	–	–	–	Not filed
American Century Companies Inc	–	–	–	–	Not filed
Impact Partnership Wealth, LLC	–	–	–	–	Not filed
Dynamic Advisor Solutions LLC	–	–	–	–	Not filed
Truist Financial Corp	–	–	–	–	Not filed
Stifel Financial Corp	–	–	–	–	Not filed
Graham Capital Management, L.P.	–	–	–	–	Not filed
Tower Research Capital LLC (TRC)	–	–	–	–	Not filed
Colony Group, LLC	–	–	–	–	Not filed
Commonwealth Equity Services, LLC	–	–	–	–	Not filed
Ausdal Financial Partners, Inc.	–	–	–	–	Not filed
First National Advisers, LLC	–	–	–	–	Not filed
Campbell & CO Investment Adviser LLC	–	–	–	–	Not filed
Chicago Partners Investment Group LLC	–	–	–	–	Not filed
Ballentine Partners, LLC	–	–	–	–	Not filed
Qtron Investments LLC	–	–	–	–	Not filed
First Pacific Financial	–	–	–	–	Not filed