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
Krilogy Financial LLC	–	–	–	–	Not filed
Ronald Blue Trust, Inc.	–	–	–	–	Not filed
Philadelphia Trust Co	–	–	–	–	Not filed
Ground Swell Capital, LLC	–	–	–	–	Not filed
New England Professional Planning Group Inc.	–	–	–	–	Not filed
AlphaCore Capital LLC	–	–	–	–	Not filed
Mirabella Financial Services LLP	–	–	–	–	Not filed
Everence Capital Management Inc	–	–	–	–	Not filed
Pinnacle Financial Partners, Inc.	–	–	–	–	Not filed
Fiduciary Trust Co	–	–	–	–	Not filed
Global Retirement Partners, LLC	–	–	–	–	Not filed
Lazard Asset Management LLC	–	–	–	–	Not filed
Brighton Jones LLC	–	–	–	–	Not filed
Bayesian Capital Management, LP	–	–	–	–	Not filed
Vestmark Advisory Solutions, Inc.	–	–	–	–	Not filed
Hantz Financial Services, Inc.	–	–	–	–	Not filed
Nykredit A/S	–	–	–	–	Not filed
Allworth Financial LP	–	–	–	–	Not filed
Spire Wealth Management	–	–	–	–	Not filed
Farther Finance Advisors, LLC	–	–	–	–	Not filed
Vestcor Inc	–	–	–	–	Not filed
Horizon Investments, LLC	–	–	–	–	Not filed
Compagnie Lombard Odier SCmA	–	–	–	–	Not filed
Eurizon Capital SGR S.p.A.	–	–	–	–	Not filed
Albion Financial Group	–	–	–	–	Not filed
Jones Financial Companies LLLP	–	–	–	–	Not filed
GAMMA Investing LLC	–	–	–	–	Not filed
Palladiem, LLC	–	–	–	–	Not filed
CVA Family Office, LLC	–	–	–	–	Not filed
Employees Retirement System of Texas	–	–	–	–	Not filed
Globeflex Capital L P	–	–	–	–	Not filed
Monetary Management Group Inc	–	–	–	–	Not filed
Clearstead Advisors, LLC	–	–	–	–	Not filed
Essential Partners LLC	–	–	–	–	Not filed
Skandinaviska Enskilda Banken AB (publ)	–	–	–	–	Not filed
Leonteq Securities AG	–	–	–	–	Not filed
IFP Advisors, Inc	–	–	–	–	Not filed
Whittier Trust Co	–	–	–	–	Not filed
Parallel Advisors, LLC	–	–	–	–	Not filed
Harvest Fund Management Co., Ltd	–	–	–	–	Not filed
Larson Financial Group LLC	–	–	–	–	Not filed
SBI Securities Co., Ltd.	–	–	–	–	Not filed
Cullen/Frost Bankers, Inc.	–	–	–	–	Not filed
Central Trust Co	–	–	–	–	Not filed
International Assets Investment Management, LLC	–	–	–	–	Not filed
Bryn Mawr Trust Co	–	–	–	–	Not filed
EverSource Wealth Advisors, LLC	–	–	–	–	Not filed
Capital Advisors, Ltd. LLC	–	–	–	–	Not filed
HM Payson & Co	–	–	–	–	Not filed
Signaturefd, LLC	–	–	–	–	Not filed
Evelyn Partners Group Ltd	–	–	–	–	Not filed
Brown Brothers Harriman & Co	–	–	–	–	Not filed
OP Asset Management Ltd	–	–	–	–	Not filed
Baillie Gifford & Co	–	–	–	–	Not filed
Weiss Asset Management LP	–	–	–	–	Not filed
Asset Planning,Inc	–	–	–	–	Not filed
Loring Wolcott & Coolidge Fiduciary Advisors LLP	–	–	–	–	Not filed
Buck Wealth Strategies, LLC	–	–	–	–	Not filed
SJS Investment Consulting Inc.	–	–	–	–	Not filed
Financial Consulate, Inc	–	–	–	–	Not filed
BFSG, LLC	–	–	–	–	Not filed
True Wealth Design, LLC	–	–	–	–	Not filed
Copeland Capital Management, LLC	–	–	–	–	Not filed
Essential Investment Partners LLC	–	–	–	–	Not filed
Wilkerson Advisory Group LLC	–	–	–	–	Not filed
Parkside Financial Bank & Trust	–	–	–	–	Not filed
Mitsubishi UFJ Kokusai Asset Management Co., Ltd.	–	–	–	–	Not filed
Quent Capital, LLC	–	–	–	–	Not filed
Manchester Capital Management LLC	–	–	–	–	Not filed
Rexford Capital Inc	–	–	–	–	Not filed
Guinness Asset Management LTD	–	–	–	–	Not filed
Smartleaf Asset Management LLC	–	–	–	–	Not filed
TD Waterhouse Canada Inc.	–	–	–	–	Not filed
Covestor Ltd	–	–	–	–	Not filed
CBIZ Investment Advisory Services, LLC	–	–	–	–	Not filed
Rothschild Investment LLC	–	–	–	–	Not filed
Massmutual Trust Co FSB	–	–	–	–	Not filed
Action Point Financial Planning, LLC	–	–	–	–	Not filed
Maseco LLP	–	–	–	–	Not filed
Glen Eagle Advisors, LLC	–	–	–	–	Not filed
Highline Wealth Partners LLC	–	–	–	–	Not filed
Danske Bank A/S	–	–	–	–	Not filed
Kemnay Advisory Services Inc.	–	–	–	–	Not filed
Silver Grove Financial Group, Inc.	–	–	–	–	Not filed
ZRC Wealth Management, LLC	–	–	–	–	Not filed
Assetmark, Inc	–	–	–	–	Not filed
Elequin Capital LP	–	–	–	–	Not filed
Itau Unibanco Holding S.A.	–	–	–	–	Not filed
Rossby Financial, LCC	–	–	–	–	Not filed
Mascoma Wealth Management LLC	–	–	–	–	Not filed
First Horizon Corp	–	–	–	–	Not filed
Activest Wealth Management	–	–	–	–	Not filed
Clal Insurance Enterprises Holdings Ltd	–	–	–	–	Not filed
Westside Investment Management, Inc.	–	–	–	–	Not filed
Dunhill Financial, LLC	–	–	–	–	Not filed
Farmers & Merchants Investments Inc	–	–	–	–	Not filed
Dogwood Wealth Management LLC	–	–	–	–	Not filed
N.E.W. Advisory Services LLC	–	–	–	–	Not filed
Westpac Banking Corp	–	–	–	–	Not filed
Gunpowder Capital Management, LLC dba Oliver Wealth Management	–	–	–	–	Not filed