CoStar Group, Inc. (CSGP) Institutional Ownership & Insider Trading

757 institutions reported holding CoStar Group, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 11 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

CSGPCoStar Group, Inc.Follow CSGP — free

Real Estate Services · Real Estate

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Market cap: 13.7B
P/E TTM: —
Dividend yield: —
52-week: —
Next earnings: 27 Oct, in 3 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

757 institutions held —% of the shares. Across filers that reported both quarters, shares held changed -1.9%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	757	414	-1.9%	290	88	251	120
Mar 26	787	407	-0.3%	294	94	250	140
Dec 25	833	414	-2.4%	248	45	355	122
Sep 25	878	415	-1.3%	304	75	255	44
Jun 25	855	424	-1.2%	299	65	280	55
Mar 25	836	423	+4.6%	327	107	235	62
Dec 24	776	406	+1.4%	260	82	245	79
Sep 24	749	392	-0.5%	264	66	246	62

CoStar Group, Inc. — questions

Who owns CoStar Group, Inc. stock?: 757 institutions reported CoStar Group, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: VANGUARD PORTFOLIO MANAGEMENT LLC (9.4%), BlackRock, Inc. (8.3%), VANGUARD CAPITAL MANAGEMENT LLC (6.6%).
Are CoStar Group, Inc. insiders buying or selling?: 11 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from CoStar Group, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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