TickerGuard
Buy Day today: Good (62) Broad market participation · no major macro event
TTEK

Tetra Tech Inc

Industrials · Engineering & Construction

36.10$ -1.0% vs. previous close Closing price · As of: Sep 17, 2026

Ownership

Ownership Structure

Who owns Tetra Tech Inc (TTEK)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.4% of the shares are freely tradable; institutional investors hold 104.4%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 104.4%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 0.5%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 99.4%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 4.7%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 256Mio.

Largest Shareholders

Institutions

Institutions TTEK
Name Stake (%) Shares Change (%) Date
BlackRock Inc 10.46 26,790,406 +4.1 03/31/2026
Vanguard Portfolio Management, LLC 4.94 12,643,094 +0.0 03/31/2026
Vanguard Capital Management, LLC 4.57 11,709,151 +0.0 03/31/2026
Capital Research & Mgmt Co - Division 3 4.55 11,651,238 +2.3 06/30/2026
State Street Corp 3.76 9,635,912 +2.2 03/31/2026
Neuberger Berman Group LLC 2.84 7,269,657 -13.0 03/31/2026

Funds

Funds TTEK
Name Stake (%) Shares Change (%) Date
iShares Core S&P Mid-Cap ETF 3.55 9,089,079 +0.0 08/31/2026
Vanguard MStar Total Stk Mkt Idx Invest 3.23 8,275,984 +0.3 07/31/2026
Pictet-Water I EUR 2.66 6,820,746 -1.0 05/31/2026
Vanguard Small Cap Index 2.33 5,967,121 +0.2 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings TTEK
Person Role Shares Value As of Type
Volpi Kirsten M Director 74,218 2,679,270 $ Aug 4, 2026 direct

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Aug 4, 2026 Volpi Kirsten M Director Other 2,300 9.59 22,057

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

Was this page helpful to you?