Who owns CoStar Group, Inc.?
Institutional ownership of CSGP from SEC Form 13F filings across 462 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
462
13F holders
$9.16B
value, 2026 filers
80.5%
of shares outstanding (326.0M sh)
65
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of CSGP's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | VANGUARD PORTFOLIO MANAGEMENT LLC | 37.9M | $1.07B | 0.0% | 9.4% | -0.8% |
| 2 | BlackRock, Inc. | 33.8M | $957.6M | 0.0% | 8.3% | 0.0% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 26.7M | $755.7M | 0.0% | 6.6% | -51.3% |
| 4 | BAMCO INC /NY/ | 21.6M | $612.5M | 0.9% | 5.3% | +32.6% |
| 5 | Capital International Investors | 16.6M | $471.3M | 0.1% | 4.1% | +7.3% |
| 6 | BAILLIE GIFFORD & CO | 13.2M | $372.5M | 0.3% | 3.2% | -3.4% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 12.2M | $343.3M | 0.0% | 3% | -2.3% |
| 8 | POLEN CAPITAL MANAGEMENT LLC | 8.8M | $248.1M | 2.1% | 2.2% | -30.3% |
| 9 | Jupiter Topco LLCNEW | 7.8M | $221.8M | 0.1% | 1.9% | new |
| 10 | Invesco Ltd. | 6.8M | $192.8M | 0.0% | 1.7% | -4.6% |
| 11 | NORGES BANKNEW | 5.9M | $168.5M | 0.0% | 1.5% | new |
| 12 | MORGAN STANLEY | 5.5M | $155.4M | 0.0% | 1.4% | +1.4% |
| 13 | GOLDMAN SACHS GROUP INC | 5.1M | $145.3M | 0.0% | 1.3% | -44.5% |
| 14 | JPMORGAN CHASE & CO | 4.9M | $145.4M | 0.0% | 1.2% | +167.1% |
| 15 | FEDERATED HERMES, INC. | 4.4M | $125.4M | 0.2% | 1.1% | +241.1% |
| 16 | Capital Research Global Investors | 4.2M | $118.8M | 0.0% | 1% | -4.1% |
| 17 | PRINCIPAL FINANCIAL GROUP INC | 3.8M | $107.4M | 0.1% | 0.9% | -78.6% |
| 18 | NORTHERN TRUST CORP | 3.4M | $97.7M | 0.0% | 0.9% | +0.5% |
| 19 | Qube Research & Technologies LtdNEW | 3.2M | $91.1M | 0.1% | 0.8% | new |
| 20 | BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 3.1M | $88.9M | 0.1% | 0.8% | +17.2% |
| 21 | Amundi | 3.1M | $88.8M | 0.0% | 0.8% | -4.4% |
| 22 | VAN ECK ASSOCIATES CORP | 3.1M | $87.2M | 0.1% | 0.8% | -11.5% |
| 23 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 3.0M | $84.5M | 0.0% | 0.7% | +212.1% |
| 24 | Sixth Street Partners Management Company, L.P.NEW | 3.0M | $83.9M | 14.5% | 0.7% | new |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 3.0M | $83.9M | 0.0% | 0.7% | +3.1% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.