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CSGP · Costar Group, Inc. · Holdings

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$27.38 -0.34 (-1.23%) At close · Oct 2
Market Cap
$11.04B
Shares
405.20M
Volume · Oct 2 3.74M Avg daily vol (3M) 6.95M

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: 766
Total Value: $11,801,068,429
Total Shares: 416,888,327
Showing 1–100 of 796 holdings by value · page 1 of 8

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 766 13F filers
Top Holder
9.1%
Sep 2023 → Jun 2026 · range 9.1% – 16.8%
of institutional value
Top 5
33.2%
Sep 2023 → Jun 2026 · range 32.9% – 40.1%
of institutional value
Top 10
48.2%
Sep 2023 → Jun 2026 · range 48.2% – 53.3%
of institutional value
HHI
319
Sep 2023 → Jun 2026 · range 319 – 496
Broadly held
Showing 100 of 796
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1057352 CUSIP 22160N109 13F (30d) 19 filings 15 filers Visit website Investor relations