CSGP · ISSUER CIK 1057352
COSTAR GROUP, INC.
Between Jul 31, 2026 and Oct 28, 2026, 5 COSTAR GROUP, INC. insiders reported $2.5M of open-market purchases and $253K of sales on SEC Form 4. The largest buyer was Florance Andrew C (Founder and CEO, Director), with $2.5M.
↗5 insiders filed
Original Form 4 filings from Jul 31, 2026 to Oct 28, 2026. 0 of 2 sales were reported under a 10b5-1 plan.
$2.5MInsider buying
$253KInsider selling
+$2.2MNet open-market
Oct 16, 2026Latest filing
| Ticker | Insider | Type | Owned | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 16, 202617:32 | Oct 15, 2026 | CSGP | Chief Financial Officer | F · Tax | $32.00 | −756 | 85,935 | -1% | $24K | ||
| Aug 10, 202616:06 | Aug 7, 2026 | CSGP | Chief Accounting Officer | S · Sell | $30.78 | −4,788 | 18,822 | -20% | −$147K | ||
| Aug 10, 202616:06 | Aug 5, 2026 | CSGP | Director | S · SellLate 5d | $30.21 | −3,500 | 22,993 | -13% | −$106K | ||
| Aug 5, 202609:27 | Aug 4, 2026 | CSGP | Founder and CEO, Director | P · Buy | $29.89 | +83,300 | 1,806,165 | +5% | +$2.5M | -14.6% | -7.9% |
| Aug 4, 202617:24 | Aug 1, 2026 | CSGP | Chief Accounting Officer | F · Tax | $28.76 | −1,077 | 23,610 | -4% | $31K | ||
| Aug 4, 202617:24 | Aug 1, 2026 | CSGP | President, Marketplaces | F · Tax | $28.76 | −1,436 | 278,415 | -1% | $41K |