Costar Group, Inc (CSGP) insider trading
Every open-market stock purchase and sale by Costar Group, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Andrew C Florance (CEO) bought $2.5M in the last 90 days.
- Cynthia Cammett Cann (C-suite exec) and 1 other sold $253K in the last 90 days.
- Congress: Gilbert Cisneros bought $1K to $15K, 2 months ago.
Last 12 months: insiders bought $8.5M (6 buys) and sold $534K (4 sales). Last close $32.90 on Oct 21, 2026.
Recent CSGP insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Oct 15, 2026 | Robin Jack Rossmann (C-suite exec) | Sold (not open market) | $24.2K |
| Aug 19, 2026 | Gilbert Cisneros (Representative) | Bought | $1K–15K |
| Aug 7, 2026 | Cynthia Cammett Cann (C-suite exec) | Sold | $147K |
| Aug 5, 2026 | John W Hill (Director) | Sold | $106K |
| Aug 4, 2026 | Andrew C Florance (CEO) | Bought | $2.5M |
| Aug 1, 2026 | Frederick G. Saint (President) | Sold (not open market) | $41.3K |
| Aug 1, 2026 | Cynthia Cammett Cann (C-suite exec) | Sold (not open market) | $31K |
| Jul 31, 2026 | Cynthia Cammett Cann (C-suite exec) | Bought (not open market) | — |
| Jul 31, 2026 | Robin Jack Rossmann (C-suite exec) | Bought (not open market) | — |
| Jul 1, 2026 | Christian M. Lown (CFO) | Sold (not open market) | $164K |
| Jun 23, 2026 | Louise S Sams (Director) | Bought (not open market) | — |
| Jun 23, 2026 | John L Berisford (Director) | Bought (not open market) | — |
| Jun 23, 2026 | Robert W Musslewhite (Director) | Bought (not open market) | — |
| Jun 23, 2026 | John W Hill (Director) | Bought (not open market) | — |
| Jun 23, 2026 | Angelique G. Brunner (Director) | Bought (not open market) | — |
| Jun 23, 2026 | Rachel C Glaser (Director) | Bought (not open market) | — |
| Jun 23, 2026 | Christine M McCarthy (Director) | Bought (not open market) | — |
| Jun 15, 2026 | Cynthia Cammett Cann (C-suite exec) | Sold (not open market) | $14.8K |
| May 1, 2026 | Andrew C Florance (CEO) | Bought | $2.4M |
| May 1, 2026 | Andrew C Florance (CEO) | Bought | $111K |
| Apr 14, 2026 | Gilbert Cisneros (Representative) | Sold | $1K–15K |
| Mar 15, 2026 | Frank Simuro (CTO) | Sold (not open market) | $485K |
| Mar 15, 2026 | Lisa Ruggles (VP) | Sold (not open market) | $130K |
| Mar 15, 2026 | Michael J Desmarais (Officer) | Sold (not open market) | $125K |
| Mar 15, 2026 | Cynthia Cammett Cann (C-suite exec) | Sold (not open market) | $52.1K |
Who's trading CSGP
- Robin Jack Rossmann, C-suite exec: other filings, last Oct 15, 2026
- Gilbert Cisneros, Representative: bought $32K (4 buys), sold $8K (1 sale), last Aug 19, 2026
- Cynthia Cammett Cann, C-suite exec: sold $274K (2 sales), last Aug 7, 2026
- John W Hill, Director: sold $260K (2 sales), last Aug 5, 2026
- Andrew C Florance, CEO: bought $7.5M (4 buys), last Aug 4, 2026
- Frederick G. Saint, President: bought $907K (1 buy), last Aug 1, 2026
- Christian M. Lown, CFO: other filings, last Jul 1, 2026
- Robert W Musslewhite, Director: other filings, last Jun 23, 2026
- Angelique G. Brunner, Director: other filings, last Jun 23, 2026
- Rachel C Glaser, Director: bought $44.9K (1 buy), last Jun 23, 2026
- John L Berisford, Director: other filings, last Jun 23, 2026
- Louise S Sams, Director: bought $48.4K (1 buy), last Jun 23, 2026
- Christine M McCarthy, Director: other filings, last Jun 23, 2026
- Michael J Desmarais, Officer: other filings, last Mar 15, 2026
- Gene Boxer, General Counsel: other filings, last Mar 15, 2026
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