$TTEK

$36.87 -$0.26 (0.7%) Close

$TTEK Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 256.0M shares outstanding

Who owns TTEK?

By type of holder

Institutions 98.6% Insiders 0.5% Everyone else 0.9%

Concentration Top 10 holders own 43.8%

BlackRock, Inc. 11.2% · Pictet Asset Management SA 5.1%

Institutional ownership

98.6%

+3.8 pts vs last qtr

Institutional holders

546

-42 vs last qtr

Net shares bought

+9.8M

by institutions in Q2 2026

New / sold out

54 / 96

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

FMR LLC +8.4M
Arrowstreet Capital, Limited Partnership +3.9M

Biggest sellers in Q2 2026

Sands Capital Management, LLC SOLD OUT −6.7M
Pictet Asset Management Holding SA −4.9M

Who is planning to sell?

Notices of proposed sale, last 12 months

$401K

1 notice from 1 person

Shares covered

10.0K

0.00% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Brian Carter Officer $401K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2022–FY2025

−1.4%

−0.46% a year

Each share's claim on the business

+1.4%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$450M vs $120M

over 4 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years64% 3–5 years6% 1–3 years19% Under 1 year10%

Quarterly turnover

17.1%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting TTEK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	28.7M	11.20%	+1.9M (+7.0%)	≤2021	0.0%
Shares held by quarter Peak holding28.7M (Q2'26) Change over 8 quarters+2.5M Share of the company11.200% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	12.5M	4.87%	−175.1K (−1.4%)	≤2021	0.0%
Shares held by quarter Peak holding12.6M (Q1'26) Change over 8 quarters+12.5M Share of the company4.870% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

28.7M

% of company

11.20%

Change vs last qtr

+1.9M (+7.0%)

Held since

≤2021

Vanguard Portfolio Management LLC

12.5M

% of company

4.87%

Change vs last qtr

−175.1K (−1.4%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Tetra Tech, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting TTEK on Form N-PORT; together they hold 42.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$257M	8.9M	3.47%	0.21%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$238M	8.2M	3.22%	0.01%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$257M

% of company

3.47%

% of the fund

0.21%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$238M

% of company

3.22%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Tetra Tech, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
PA Pictet Asset Management SA 5%+ holder 13D · 4.9%	13.0M	5.08%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company5.080% Disclosed stake13D · 4.9% View the 13D/G filing →
BD Batrack Dan L Insider	332.5K	0.13%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.130% Batrack Dan L's insider activity →

Pictet Asset Management SA

5%+ holder13D · 4.9%

13.0M

% of company

5.08%

Change vs last qtr

—

Held since

—

Batrack Dan L

Insider

332.5K

% of company

0.13%

Change vs last qtr

—

Held since

—

12 more holders behind a free account

See every insider and 5%+ holder of Tetra Tech, Inc..

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