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TTEK · Tetra Tech Inc

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$37.00 +0.43 (+1.18%) At close · Aug 21
Market Cap
$9.47B
Shares
256.04M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 545
Total Value: $7,318,206,478
Total Shares: 253,312,803

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 545 13F filers · Δ vs Mar 31, 2026
Top Holder
11.3%
Sep 2023 → Jun 2026 · range 10.6% – 11.7%
+0.4 pts
Top 5
29.3%
Sep 2023 → Jun 2026 · range 29.3% – 37.7%
−0.1 pts
Top 10
41.6%
Sep 2023 → Jun 2026 · range 41.6% – 50.3%
−1.6 pts
HHI
291
Sep 2023 → Jun 2026 · range 288 – 400
Broadly held+3

Quarterly Activity

vs Mar 31, 2026
New
55
Increased
202
Decreased
210
Sold Out
103
Unchanged
78
Holder count: -48
Institutional value: -0.8%
Shares held: +3.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 555
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 831641 CUSIP 88162G103 13F (30d) 453 filings 441 filers Visit website Investor relations