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CSGP · Costar Group, Inc.

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$33.74 +2.36 (+7.50%)
Market Cap
$13.64B
Shares
405.20M

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: 753
Total Value: $11,675,584,638
Total Shares: 412,456,958

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 753 13F filers · Δ vs Mar 31, 2026
Top Holder
9.2%
Sep 2023 → Jun 2026 · range 9.2% – 16.9%
−0.1 pts
Top 5
33.6%
Sep 2023 → Jun 2026 · range 33.1% – 40.1%
+0.5 pts
Top 10
48.7%
Sep 2023 → Jun 2026 · range 48.7% – 53.3%
−1.5 pts
HHI
326
Sep 2023 → Jun 2026 · range 326 – 496
Broadly held−9

Quarterly Activity

vs Mar 31, 2026
New
114
Increased
304
Decreased
259
Sold Out
163
Unchanged
76
Holder count: -49
Institutional value: -29.5%
Shares held: +0.4%

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 783
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1057352 CUSIP 22160N109 13F (30d) 721 filings 683 filers Visit website