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TTEK · Tetra Tech Inc · Holdings

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$33.33 +0.61 (+1.86%) At close · Oct 8
Market Cap
$8.38B
Shares
256.04M
Volume · Oct 8 1.52M Avg daily vol (3M) 2.53M

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.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 558
Total Value: $7,365,276,460
Total Shares: 254,913,013
Showing 1–100 of 568 holdings by value · page 1 of 6

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 557 13F filers
Top Holder
11.3%
Sep 2023 → Jun 2026 · range 10.6% – 11.7%
of institutional value
Top 5
29.2%
Sep 2023 → Jun 2026 · range 29.2% – 37.7%
of institutional value
Top 10
41.4%
Sep 2023 → Jun 2026 · range 41.4% – 50.3%
of institutional value
HHI
288
Sep 2023 → Jun 2026 · range 288 – 400
Broadly held
Showing 100 of 568
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 831641 CUSIP 88162G103 13F (30d) 22 filings 18 filers Visit website Investor relations