CoStar Group
Connects proprietary real estate data with analytics, marketplaces, and digital-twin tools.
$32.43
After-hours close+0.22 (+0.68%)
At close$32.22(+2.79%)
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Breakdown13F · Form 4
Institutions 107.46%Insiders 0.80%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 405.20M · Float 401.67M · 99.1% free float
Institutions13F, as of Jun 30, 2026
793 holders · 435.42M shares · 117 new positions · 415 increased · 270 reduced · 155 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Vanguard Portfolio Management LLC | 37.91M | 9.36% | −319.3K | Aug 13, 2026 |
| BlackRock, Inc. | 33.81M | 8.35% | +5.8K | Aug 7, 2026 |
| Vanguard Capital Management LLC | 26.68M | 6.59% | −740.1K | Aug 13, 2026 |
| Bamco Inc /NY/ | 21.63M | 5.34% | +5.31M | Aug 14, 2026 |
| State Street Corp | 18.41M | 4.54% | −240.1K | Aug 7, 2026 |
| Capital International Investors | 16.64M | 4.11% | +1.13M | Aug 12, 2026 |
| Baillie Gifford & Co | 13.15M | 3.25% | −456.8K | Aug 6, 2026 |
| Geode Capital Management, LLC | 12.17M | 3.00% | −282.2K | Aug 12, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Vanguard Portfolio Management | 9.12% | 38.29M | 13G | Apr 29, 2026 ↗ |
| Vanguard Capital Management | 7.53% | 31.61M | 13G | Apr 29, 2026 ↗ |
| BlackRock, Inc. | 7.50% | 31.82M | 13G | Apr 23, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Andrew C. Florance | director, officer: Founder and CEO | 1.81M | 0.45% | Aug 5, 2026 |
| Frank Simuro | officer: Chief Technology Officer | 414.5K | 0.10% | Mar 17, 2026 |
| Frederick G. Saint | officer: President, Marketplaces | 278.4K | 0.07% | Aug 4, 2026 |
| Lisa Ruggles | officer: Senior VP, Global Operations | 174.9K | 0.04% | Mar 17, 2026 |
| Christian M. Lown | officer: Chief Financial Officer | 129.7K | 0.03% | Jul 6, 2026 |
| Gene Boxer | officer: General Counsel and Secretary | 95.5K | 0.02% | Mar 17, 2026 |
| Michael J. Desmarais | officer: Chief Human Resources Officer | 87.7K | 0.02% | Mar 17, 2026 |
| Robin Jack Rossmann | officer: Chief Financial Officer | 86.7K | 0.02% | Aug 4, 2026 |
| Louise S. Sams | director | 28.7K | 0.01% | Jun 24, 2026 |
| Robert W. Musslewhite | director | 26.5K | 0.01% | Jun 24, 2026 |
20 people have not refiled in the last 18 months (8.78M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 5, 2026 | John W. Hilldirector | Sale | 3,500 | $30.21 | 22,993 |
| Aug 7, 2026 | Cynthia Cammett Cannofficer: Chief Accounting Officer | Sale | 4,788 | $30.78 | 18,822 |
| Aug 4, 2026 | Andrew C. Florancedirector, officer: Founder and CEO | Purchase | 83,300 | $29.89 | 1,806,165 |
| May 1, 2026 | Andrew C. Florancedirector, officer: President and CEO | Purchase · 2 lots | 71,430 | $35.20 | 1,722,865 |
| Mar 6, 2026 | Louise S. Samsdirector | Purchase | 1,000 | $48.36 | 20,409 |
| Mar 2, 2026 | Frederick G. Saintofficer: President, Marketplaces | Purchase | 20,000 | $45.33 | 279,851 |
| Mar 2, 2026 | Rachel C. Glaserdirector | Purchase | 1,000 | $44.94 | 4,157 |
| Feb 27, 2026 | Andrew C. Florancedirector, officer: President and CEO | Purchase | 55,720 | $44.52 | 1,586,866 |
| Nov 13, 2025 | Cynthia Cammett Cannofficer: Chief Accounting Officer | Sale | 1,841 | $68.79 | 23,211 |
| Nov 13, 2025 | John W. Hilldirector | Sale | 2,250 | $68.68 | 18,231 |
CongressHouse and Senate disclosures
| Member | Type | Amount | Owner | Traded | Disclosed |
|---|---|---|---|---|---|
| Rep. Gilbert Cisneros · CA31 | Sale | $1,001 – $15,000 | Apr 14, 2026 | May 11, 2026 ↗ | |
| Rep. Gilbert Cisneros · CA31 | Purchase | $1,001 – $15,000 | Mar 13, 2026 | Apr 8, 2026 ↗ |