CSGP insider buying and SEC filings, explained
Costar Group, Inc. · CIK 1057352
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$8.5M
Insiders who bought
4
Sold (not marked 10b5-1)
$534K
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 7, 2026 | Sale | Cynthia Cammett Cann (Chief Accounting Officer) sold 4,788 shares at $30.78 ($147K). Holdings down 20% to 18,822 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 10, 2026 |
| Aug 5, 2026 | Sale | John W Hill (Director) sold 3,500 shares at $30.21 ($106K). Holdings down 13% to 22,993 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 10, 2026 |
| Aug 4, 2026 | Purchase (code P) | Andrew C. Florance (CEO and Director) bought 83,300 shares at $29.89 ($2.5M), reported as a purchase (code P). Holdings up 5% to 1,806,165 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 5, 2026 |
| May 1, 2026 | Purchase (code P) | Andrew C. Florance (CEO and Director) bought 71,430 shares at about $35.20 ($2.5M), reported as a purchase (code P). Holdings up 4% to 1,722,865 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 4, 2026 |
| Mar 6, 2026 | Purchase (code P) | Louise S Sams (Director) bought 1,000 shares at $48.36 ($48K), reported as a purchase (code P). Holdings up 5% to 20,409 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 9, 2026 |
| Mar 2, 2026 | Purchase (code P) | Rachel C Glaser (Director) bought 1,000 shares at $44.94 ($45K), reported as a purchase (code P). Holdings up 32% to 4,157 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Mar 2, 2026 | Purchase (code P) | Frederick G. Saint (President / COO) bought 20,000 shares at $45.33 ($907K), reported as a purchase (code P). Holdings up 8% to 279,851 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Feb 27, 2026 | Purchase (code P) | Andrew C. Florance (CEO and Director) bought 55,720 shares at $44.52 ($2.5M), reported as a purchase (code P). Holdings up 4% to 1,586,866 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 2, 2026 |
| Nov 13, 2025 | Sale | John W Hill (Director) sold 2,250 shares at $68.68 ($155K). Holdings down 11% to 18,231 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 17, 2025 |
| Nov 13, 2025 | Sale | Cynthia Cammett Cann (Chief Accounting Officer) sold 1,841 shares at $68.79 ($127K). Holdings down 7% to 23,211 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 17, 2025 |
40 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
4 insiders bought in 30 days
$3.5M in purchases since Feb 27, 2026 · Purchases traded Feb 27, 2026 to Mar 6, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Andrew C. Florance (CEO) | $2.5M | Feb 27, 2026 | SEC filing |
| Frederick G. Saint (President / COO) | $907K | Mar 2, 2026 | SEC filing |
| Rachel C Glaser (Director) | $45K | Mar 2, 2026 | SEC filing |
| Louise S Sams (Director) | $48K | Mar 6, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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