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
Alliancebernstein L.P.	–	–	–	–	Not filed
Intech Investment Management LLC	–	–	–	–	Not filed
Canada Pension Plan Investment Board	–	–	–	–	Not filed
Prudential Financial Inc	–	–	–	–	Not filed
Nomura Asset Management International Inc.	–	–	–	–	Not filed
Renaissance Investment Group LLC	–	–	–	–	Not filed
California State Teachers Retirement System	–	–	–	–	Not filed
DekaBank Deutsche Girozentrale	–	–	–	–	Not filed
State of Wisconsin Investment Board	–	–	–	–	Not filed
Man Group plc	–	–	–	–	Not filed
Public Sector Pension Investment Board	–	–	–	–	Not filed
Foresight Group Ltd Liability Partnership	–	–	–	–	Not filed
New York State Teachers Retirement System	–	–	–	–	Not filed
Candriam Luxembourg S.C.A.	–	–	–	–	Not filed
SEI Investments Co	–	–	–	–	Not filed
Bank of Montreal	–	–	–	–	Not filed
Jupiter Topco LLC	–	–	–	–	Not filed
Rockefeller Capital Management L.P.	–	–	–	–	Not filed
Citigroup Inc	–	–	–	–	Not filed
Capital International Sarl	–	–	–	–	Not filed
GHP Investment Advisors, Inc.	–	–	–	–	Not filed
Dana Investment Advisors, Inc.	–	–	–	–	Not filed
State Board of Administration of Florida Retirement System	–	–	–	–	Not filed
Nicholas Company, Inc.	–	–	–	–	Not filed
Vanguard Asset Management, Ltd	–	–	–	–	Not filed
AlpenGlobal Capital LLC	–	–	–	–	Not filed
Advisors Asset Management, Inc.	–	–	–	–	Not filed
Duff & Phelps Investment Management Co	–	–	–	–	Not filed
Raymond James Financial Inc	–	–	–	–	Not filed
Manufacturers Life Insurance Company, The	–	–	–	–	Not filed
Y-Intercept (Hong Kong) Ltd	–	–	–	–	Not filed
SFE Investment Counsel	–	–	–	–	Not filed
New York State Common Retirement Fund	–	–	–	–	Not filed
Holocene Advisors, LP	–	–	–	–	Not filed
Voya Investment Management LLC	–	–	–	–	Not filed
Blair William & Co	–	–	–	–	Not filed
Bahl & Gaynor Inc	–	–	–	–	Not filed
Two Sigma Investments, LP	–	–	–	–	Not filed
Rock Point Advisors, LLC	–	–	–	–	Not filed
Great West Life Assurance Co	–	–	–	–	Not filed
Future Fund LLC	–	–	–	–	Not filed
Bleakley Financial Group, LLC	–	–	–	–	Not filed
Creative Planning	–	–	–	–	Not filed
Russell Investments Group, Ltd.	–	–	–	–	Not filed
Treasurer of the State of North Carolina	–	–	–	–	Not filed
Crossmark Global Holdings, Inc.	–	–	–	–	Not filed
Susquehanna International Group, LLP	–	–	–	–	Not filed
Virginia Retirement Systems Et Al	–	–	–	–	Not filed
Capital International Ltd	–	–	–	–	Not filed
Crown Advisors Management, Inc.	–	–	–	–	Not filed
MetLife Investment Management	–	–	–	–	Not filed
Rice Hall James & Associates, LLC	–	–	–	–	Not filed
Amalgamated Bank	–	–	–	–	Not filed
Police & Firemen's Retirement System of New Jersey	–	–	–	–	Not filed
Louisbourg Investments Inc.	–	–	–	–	Not filed
River Wealth Advisors LLC	–	–	–	–	Not filed
Portman Square Capital LLP	–	–	–	–	Not filed
Edmond de Rothschild Holding S.A.	–	–	–	–	Not filed
Nordea Investment Management AB	–	–	–	–	Not filed
State of Tennessee, Treasury Department	–	–	–	–	Not filed
Swiss Life Asset Management Ltd	–	–	–	–	Not filed
Nisa Investment Advisors, LLC	–	–	–	–	Not filed
Elo Mutual Pension Insurance Co	–	–	–	–	Not filed
Catalyst Capital Advisors LLC	–	–	–	–	Not filed
Bessemer Group Inc	–	–	–	–	Not filed
Isthmus Partners, LLC	–	–	–	–	Not filed
LPL Financial LLC	–	–	–	–	Not filed
Freestone Grove Partners LP	–	–	–	–	Not filed
Vanguard Global Advisers, LLC	–	–	–	–	Not filed
Zacks Investment Management	–	–	–	–	Not filed
Kennedy Capital Management, Inc.	–	–	–	–	Not filed
Union Bancaire Privee, UBP SA	–	–	–	–	Not filed
Mutual of America Capital Management LLC	–	–	–	–	Not filed
Los Angeles Capital Management LLC	–	–	–	–	Not filed
One Capital Management, LLC	–	–	–	–	Not filed
First National Bank of Omaha	–	–	–	–	Not filed
Cerity Partners LLC	–	–	–	–	Not filed
Montanaro Asset Management Ltd	–	–	–	–	Not filed
KLP Kapitalforvaltning AS	–	–	–	–	Not filed
HBK Investments L P	–	–	–	–	Not filed
Asset Management One Co.,Ltd.	–	–	–	–	Not filed
Federation des caisses Desjardins du Quebec	–	–	–	–	Not filed
State of New Jersey Common Pension Fund D	–	–	–	–	Not filed
La Banque Postale Asset Management SA	–	–	–	–	Not filed
Boothbay Fund Management, LLC	–	–	–	–	Not filed
Teachers Retirement System of the State of Kentucky	–	–	–	–	Not filed
Thrivent Financial for Lutherans	–	–	–	–	Not filed
Public Employees Retirement System of Ohio	–	–	–	–	Not filed
Scholtz & Company, LLC	–	–	–	–	Not filed
Staley Capital Advisers Inc	–	–	–	–	Not filed
Louisiana State Employees Retirement System	–	–	–	–	Not filed
Moran Wealth Management, LLC	–	–	–	–	Not filed
Brinker Capital Investments, LLC	–	–	–	–	Not filed
Universal- Beteiligungs- und Servicegesellschaft mbH	–	–	–	–	Not filed
Mercer Global Advisors Inc	–	–	–	–	Not filed
S&T Bank	–	–	–	–	Not filed
Yousif Capital Management, LLC	–	–	–	–	Not filed
Wealth Enhancement Advisory Services, LLC	–	–	–	–	Not filed
Relyea Zuckerberg Hanson LLC	–	–	–	–	Not filed
HighTower Advisors, LLC	–	–	–	–	Not filed