There have been 50 recent insider transactions recorded for CoStar Group, Inc. (CSGP), including 24 buys and 25 sells. Total insider buying was valued at $11.84M and total insider selling at $11.29M.
Notable insiders with recent activity include Cann Cynthia Cammett, Banerjee Nana, Ruggles Lisa. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.
Insider Transactions — CSGP
| Date |
Name |
Role |
Transaction |
Shares |
Avg. Price |
Value |
Shares Owned |
| 2026-03-15 |
Cann Cynthia Cammett |
Chief Accounting Officer |
Tax Withholding of RSU |
1,194 |
$43.63 |
$52.09K |
25,148 |
| 2026-03-15 |
Banerjee Nana |
Director |
Unknown |
- |
- |
- |
- |
| 2026-03-15 |
Ruggles Lisa |
Senior VP, Global Operations |
Tax Withholding of RSU |
2,977 |
$43.63 |
$129.89K |
174,915 |
| 2026-03-15 |
Boxer Gene |
General Counsel and Secretary |
Tax Withholding of RSU |
428 |
$43.63 |
$18.67K |
95,517 |
| 2026-03-15 |
Boxer Gene |
General Counsel and Secretary |
Tax Withholding of RSU |
482 |
$43.63 |
$21.03K |
95,463 |
| 2026-03-15 |
Desmarais Michael J |
Chief Human Resources Officer |
Tax Withholding of RSU |
2,873 |
$43.63 |
$125.35K |
87,725 |
| 2026-03-15 |
Simuro Frank |
Chief Technology Officer |
Tax Withholding of RSU |
11,107 |
$43.63 |
$484.6K |
414,491 |
| 2026-03-10 |
Florance Andrew C |
President and CEO |
RSU Award |
124,162 |
$46.34 |
$5.75M |
1,651,435 |
| 2026-03-10 |
Cann Cynthia Cammett |
Chief Accounting Officer |
RSU Award |
4,374 |
$46.34 |
$202.69K |
26,342 |
| 2026-03-10 |
Lown Christian M. |
Chief Financial Officer |
RSU Award |
12,268 |
$46.34 |
$568.5K |
135,250 |
| 2026-03-10 |
Boxer Gene |
General Counsel and Secretary |
RSU Award |
21,920 |
$46.34 |
$1.02M |
95,945 |
| 2026-03-10 |
Desmarais Michael J |
Chief Human Resources Officer |
RSU Award |
17,676 |
$46.34 |
$819.11K |
90,598 |
| 2026-03-06 |
Sams Louise S |
Director |
Informative Buy |
1,000 |
$48.36 |
$48.36K |
20,409 |
| 2026-03-02 |
Glaser Rachel C |
Director |
Informative Buy |
1,000 |
$44.94 |
$44.94K |
4,157 |
| 2026-03-02 |
Saint Frederick G. |
President, Marketplaces |
Informative Buy |
20,000 |
$45.33 |
$906.6K |
279,851 |
| 2026-03-01 |
Florance Andrew C |
President and CEO |
Tax Withholding of RSU |
59,593 |
$44.63 |
$2.66M |
1,527,273 |
| 2026-03-01 |
Cann Cynthia Cammett |
Chief Accounting Officer |
Tax Withholding of RSU |
1,385 |
$44.63 |
$61.81K |
21,968 |
| 2026-03-01 |
Saint Frederick G. |
President, Marketplaces |
Tax Withholding of RSU |
11,096 |
$44.63 |
$495.21K |
259,851 |
| 2026-03-01 |
Lown Christian M. |
Chief Financial Officer |
Tax Withholding of RSU |
7,175 |
$44.63 |
$320.22K |
122,982 |
| 2026-03-01 |
Ruggles Lisa |
Senior VP, Global Operations |
Tax Withholding of RSU |
8,931 |
$44.63 |
$398.59K |
177,892 |
| 2026-03-01 |
Boxer Gene |
General Counsel and Secretary |
Tax Withholding of RSU |
4,547 |
$44.63 |
$202.93K |
74,025 |
| 2026-03-01 |
Desmarais Michael J |
Chief Human Resources Officer |
Tax Withholding of RSU |
6,353 |
$44.63 |
$283.53K |
72,922 |
| 2026-03-01 |
Simuro Frank |
Chief Technology Officer |
Tax Withholding of RSU |
18,702 |
$44.63 |
$834.67K |
425,598 |
| 2026-02-27 |
Florance Andrew C |
President and CEO |
Informative Buy |
55,720 |
$44.52 |
$2.48M |
1,586,866 |
| 2026-02-27 |
Florance Andrew C |
President and CEO |
RSU Award |
83,708 |
- |
- |
83,708 |
| 2026-02-27 |
Cann Cynthia Cammett |
Chief Accounting Officer |
RSU Award |
6,834 |
- |
- |
6,834 |
| 2026-02-27 |
Saint Frederick G. |
President, Marketplaces |
RSU Award |
39,652 |
- |
- |
39,652 |
| 2026-02-27 |
Lown Christian M. |
Chief Financial Officer |
RSU Award |
39,652 |
- |
- |
39,652 |
| 2026-02-27 |
Ruggles Lisa |
Senior VP, Global Operations |
RSU Award |
28,197 |
- |
- |
28,197 |
| 2026-02-27 |
Boxer Gene |
General Counsel and Secretary |
RSU Award |
26,888 |
- |
- |
26,888 |
| 2026-02-27 |
Desmarais Michael J |
Chief Human Resources Officer |
RSU Award |
17,926 |
- |
- |
17,926 |
| 2026-02-27 |
Simuro Frank |
Chief Technology Officer |
RSU Award |
52,869 |
- |
- |
52,869 |
| 2026-02-19 |
Florance Andrew C |
President and CEO |
Tax Withholding of RSU |
19,221 |
$49.07 |
$943.17K |
1,531,146 |
| 2026-02-19 |
Saint Frederick G. |
President, Marketplaces |
Tax Withholding of RSU |
2,149 |
$49.07 |
$105.45K |
270,947 |
| 2026-02-19 |
Ruggles Lisa |
Senior VP, Global Operations |
Tax Withholding of RSU |
3,219 |
$49.07 |
$157.96K |
186,823 |
| 2026-02-19 |
Simuro Frank |
Chief Technology Officer |
Tax Withholding of RSU |
4,421 |
$49.07 |
$216.94K |
444,300 |
| 2026-02-15 |
Florance Andrew C |
President and CEO |
Tax Withholding of RSU |
17,482 |
$44.99 |
$786.52K |
1,655,350 |
| 2026-02-15 |
Saint Frederick G. |
President, Marketplaces |
Tax Withholding of RSU |
2,424 |
$44.99 |
$109.06K |
290,679 |
| 2026-02-15 |
Ruggles Lisa |
Senior VP, Global Operations |
Tax Withholding of RSU |
3,576 |
$44.99 |
$160.88K |
207,625 |
| 2026-02-15 |
Simuro Frank |
Chief Technology Officer |
Tax Withholding of RSU |
4,151 |
$44.99 |
$186.75K |
479,448 |
| 2025-11-13 |
Hill John W |
Director |
Informative Sell |
2,250 |
$68.68 |
$154.53K |
18,231 |
| 2025-11-13 |
Cann Cynthia Cammett |
Chief Accounting Officer |
Informative Sell |
1,841 |
$68.79 |
$126.64K |
23,211 |
| 2025-09-09 |
Mccarthy Christine M |
Director |
RSU Award |
2,973 |
- |
- |
2,973 |
| 2025-09-09 |
Hill John W |
Director |
RSU Award |
3,177 |
- |
- |
20,481 |
| 2025-09-09 |
Musslewhite Robert W |
Director |
RSU Award |
3,121 |
- |
- |
18,277 |
| 2025-09-09 |
Berisford John L |
Director |
RSU Award |
2,973 |
- |
- |
2,973 |
| 2025-09-09 |
Glaser Rachel C |
Director |
RSU Award |
3,143 |
- |
- |
3,143 |
| 2025-09-09 |
Brunner Angelique G. |
Director |
RSU Award |
3,143 |
- |
- |
10,166 |
| 2025-09-09 |
Sams Louise S |
Director |
RSU Award |
3,291 |
- |
- |
19,409 |
| 2025-08-28 |
Saint Frederick G. |
President, Marketplaces |
Informative Sell |
25,000 |
$90.33 |
$2.26M |
293,103 |
■ Informative Buy/Sell — open market transaction (most significant)
■ Uninformative Buy — award, option exercise, conversion
■ Uninformative Sell — tax withholding, award vest sale
■ Neutral — gift, trust, expiry
