CSGP · CoStar Group Inc. Common Stock
View on chartInsiders & Stakes
| KLEIN MICHAEL R Director | ▼ Sell | Gift | 1,848,592 Shares held | 12/10/2024 | View profile |
| Andrew C. Florance President and CEO | ▲ Buy | Open Market | 1,806,165 Shares held | 8/4/2026 | View profile |
| Frank Simuro Chief Technology Officer | ▼ Sell | Tax Withholding | 414,491 Shares held | 3/15/2026 | View profile |
| Wheeler Scott T Chief Financial Officer | ▼ Sell | Open Market | 303,417 Shares held | 4/26/2024 | View profile |
| Frederick G. Saint President, Marketplaces | ▼ Sell | Tax Withholding | 278,415 Shares held | 8/1/2026 | View profile |
| NASSETTA CHRISTOPHER J See Remarks | ▼ Sell | Open Market | 229,715 Shares held | 11/27/2024 | View profile |
| Lisa Ruggles Senior VP, Global Research | ▼ Sell | Tax Withholding | 174,915 Shares held | 3/15/2026 | View profile |
| Christian M. Lown Chief Financial Officer | ▼ Sell | Tax Withholding | 129,653 Shares held | 7/1/2026 | View profile |
| Glosserman Michael J Director | ▲ Buy | Grant | 101,465 Shares held | 10/30/2023 | View profile |
| Gene Boxer General Counsel and Secretary | ▼ Sell | Tax Withholding | 95,517 Shares held | 3/15/2026 | View profile |
| Michael J. Desmarais Chief Human Resources Officer | ▼ Sell | Tax Withholding | 87,725 Shares held | 3/15/2026 | View profile |
| Louise S. Sams Director | ▲ Buy | Grant | 28,671 Shares held | 6/23/2026 | View profile |
| Robert W. Musslewhite President | ▲ Buy | Grant | 26,539 Shares held | 6/23/2026 | View profile |
| John W. Hill Director | ▼ Sell | Open Market | 22,993 Shares held | 8/5/2026 | View profile |
| Cynthia Cammett Cann Chief Accounting Officer | ▼ Sell | Open Market | 18,822 Shares held | 8/7/2026 | View profile |
| Angelique G. Brunner Director | ▲ Buy | Grant | 18,428 Shares held | 6/23/2026 | View profile |
| Kaplan Laura Cox Director | ▲ Buy | Grant | 17,835 Shares held | 7/17/2024 | View profile |
| Rachel C. Glaser Director | ▲ Buy | Grant | 12,419 Shares held | 6/23/2026 | View profile |
| Christine M. McCarthy Director | ▲ Buy | Grant | 11,585 Shares held | 6/23/2026 | View profile |
| John L. Berisford President, S&P Ratings | ▲ Buy | Grant | 11,235 Shares held | 6/23/2026 | View profile |
Transaction History
| Cynthia Cammett Cann | ▼ Sell | Open Market | 4,788 | $147K | 8/7/2026 |
| John W. Hill | ▼ Sell | Open Market | 3,500 | $106K | 8/5/2026 |
| Andrew C. Florance | ▲ Buy | Open Market | 83,300 | $2.5M | 8/4/2026 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 1,077 | $31K | 8/1/2026 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 1,436 | $41K | 8/1/2026 |
| Christian M. Lown | ▼ Sell | Tax Withholding | 5,597 | $164K | 7/1/2026 |
| Rachel C. Glaser | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| John L. Berisford | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| John W. Hill | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| Angelique G. Brunner | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| Robert W. Musslewhite | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| Louise S. Sams | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| Christine M. McCarthy | ▲ Buy | Grant | 8,262 | $0 | 6/23/2026 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 461 | $15K | 6/15/2026 |
| Andrew C. Florance | ▲ Buy | Open Market | 68,330 | $2.4M | 5/1/2026 |
| Andrew C. Florance | ▲ Buy | Open Market | 3,100 | $111K | 5/1/2026 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 2,977 | $130K | 3/15/2026 |
| Gene Boxer | ▼ Sell | Tax Withholding | 428 | $19K | 3/15/2026 |
| Frank Simuro | ▼ Sell | Tax Withholding | 11,107 | $485K | 3/15/2026 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 2,873 | $125K | 3/15/2026 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 1,194 | $52K | 3/15/2026 |
| Cynthia Cammett Cann | ▲ Buy | Grant | 4,374 | — | 3/10/2026 |
| Andrew C. Florance | ▲ Buy | Grant | 124,162 | — | 3/10/2026 |
| Christian M. Lown | ▲ Buy | Grant | 12,268 | — | 3/10/2026 |
| Gene Boxer | ▲ Buy | Grant | 21,920 | — | 3/10/2026 |
| Michael J. Desmarais | ▲ Buy | Grant | 17,676 | — | 3/10/2026 |
| Louise S. Sams | ▲ Buy | Open Market | 1,000 | $48K | 3/6/2026 |
| Rachel C. Glaser | ▲ Buy | Open Market | 1,000 | $45K | 3/2/2026 |
| Frederick G. Saint | ▲ Buy | Open Market | 20,000 | $907K | 3/2/2026 |
| Christian M. Lown | ▼ Sell | Tax Withholding | 7,175 | $320K | 3/1/2026 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 59,593 | $2.7M | 3/1/2026 |
| Gene Boxer | ▼ Sell | Tax Withholding | 4,547 | $203K | 3/1/2026 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 6,353 | $284K | 3/1/2026 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 1,385 | $62K | 3/1/2026 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 8,931 | $399K | 3/1/2026 |
| Frank Simuro | ▼ Sell | Tax Withholding | 18,702 | $835K | 3/1/2026 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 11,096 | $495K | 3/1/2026 |
| Andrew C. Florance | ▲ Buy | Open Market | 55,720 | $2.5M | 2/27/2026 |
| Frank Simuro | ▼ Sell | Other | 30,727 | $0 | 2/19/2026 |
| Frank Simuro | ▼ Sell | Tax Withholding | 4,421 | $217K | 2/19/2026 |
| Frederick G. Saint | ▼ Sell | Other | 17,583 | $0 | 2/19/2026 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 2,149 | $105K | 2/19/2026 |
| Andrew C. Florance | ▼ Sell | Other | 104,983 | $0 | 2/19/2026 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 19,221 | $943K | 2/19/2026 |
| Lisa Ruggles | ▼ Sell | Other | 17,583 | $0 | 2/19/2026 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 3,219 | $158K | 2/19/2026 |
| Frank Simuro | ▼ Sell | Tax Withholding | 4,151 | $187K | 2/15/2026 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 17,482 | $787K | 2/15/2026 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 3,576 | $161K | 2/15/2026 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 2,424 | $109K | 2/15/2026 |
| John W. Hill | ▼ Sell | Open Market | 2,250 | $155K | 11/13/2025 |
| Cynthia Cammett Cann | ▼ Sell | Open Market | 1,841 | $127K | 11/13/2025 |
| Christine M. McCarthy | ▲ Buy | Grant | 2,973 | $0 | 9/9/2025 |
| John L. Berisford | ▲ Buy | Grant | 2,973 | $0 | 9/9/2025 |
| John W. Hill | ▲ Buy | Grant | 3,177 | $0 | 9/9/2025 |
| Robert W. Musslewhite | ▲ Buy | Grant | 3,121 | $0 | 9/9/2025 |
| Rachel C. Glaser | ▲ Buy | Grant | 3,143 | $0 | 9/9/2025 |
| Angelique G. Brunner | ▲ Buy | Grant | 3,143 | $0 | 9/9/2025 |
| Louise S. Sams | ▲ Buy | Grant | 3,291 | $0 | 9/9/2025 |
| Frederick G. Saint | ▼ Sell | Open Market | 25,000 | $2.3M | 8/28/2025 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 719 | $68K | 8/1/2025 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 1,436 | $137K | 8/1/2025 |
| Frederick G. Saint | ▼ Sell | Open Market | 25,000 | $2.3M | 7/28/2025 |
| Cynthia Cammett Cann | ▼ Sell | Open Market | 2,033 | $189K | 7/28/2025 |
| Christian M. Lown | ▼ Sell | Tax Withholding | 4,666 | $375K | 7/1/2025 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 461 | $37K | 6/15/2025 |
| Frederick G. Saint | ▼ Sell | Open Market | 25,000 | $2.0M | 6/11/2025 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 12 | $883 | 6/1/2025 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 1,958 | $154K | 3/15/2025 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 1,191 | $94K | 3/15/2025 |
| Gene Boxer | ▼ Sell | Tax Withholding | 481 | $38K | 3/15/2025 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 3,641 | $287K | 3/15/2025 |
| Frank Simuro | ▼ Sell | Tax Withholding | 5,700 | $449K | 3/15/2025 |
| Cynthia Cammett Cann | ▼ Sell | Open Market | 1,749 | $140K | 3/10/2025 |
| Cynthia Cammett Cann | ▲ Buy | Grant | 1,498 | — | 3/5/2025 |
| Gene Boxer | ▲ Buy | Grant | 12,492 | — | 3/5/2025 |
| Andrew C. Florance | ▲ Buy | Grant | 76,232 | — | 3/5/2025 |
| Michael J. Desmarais | ▲ Buy | Grant | 9,026 | — | 3/5/2025 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 7,410 | $565K | 3/1/2025 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 3,893 | $297K | 3/1/2025 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 8,252 | $629K | 3/1/2025 |
| Cynthia Cammett Cann | ▼ Sell | Tax Withholding | 813 | $62K | 3/1/2025 |
| Gene Boxer | ▼ Sell | Tax Withholding | 3,644 | $278K | 3/1/2025 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 41,296 | $3.1M | 3/1/2025 |
| Frank Simuro | ▼ Sell | Tax Withholding | 12,432 | $948K | 3/1/2025 |
| Michael J. Desmarais | ▲ Buy | Grant | 18,828 | $0 | 2/27/2025 |
| Cynthia Cammett Cann | ▲ Buy | Grant | 4,035 | $0 | 2/27/2025 |
| Gene Boxer | ▲ Buy | Grant | 26,897 | $0 | 2/27/2025 |
| Lisa Ruggles | ▲ Buy | Grant | 65,440 | $0 | 2/20/2025 |
| Christian M. Lown | ▲ Buy | Grant | 97,600 | $0 | 2/20/2025 |
| Andrew C. Florance | ▲ Buy | Grant | 451,440 | $0 | 2/20/2025 |
| Frank Simuro | ▲ Buy | Grant | 130,640 | $0 | 2/20/2025 |
| Frederick G. Saint | ▲ Buy | Grant | 97,600 | $0 | 2/20/2025 |
| Frank Simuro | ▼ Sell | Tax Withholding | 5,485 | $406K | 2/15/2025 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 3,531 | $262K | 2/15/2025 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 14,235 | $1.1M | 2/15/2025 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 2,349 | $174K | 2/15/2025 |
| Andrew C. Florance | ▼ Sell | Other | 28,896 | $0 | 2/13/2025 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 33,511 | $2.5M | 2/13/2025 |
| Lisa Ruggles | ▼ Sell | Other | 6,452 | $0 | 2/13/2025 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 7,481 | $548K | 2/13/2025 |
| Frank Simuro | ▼ Sell | Other | 6,452 | $0 | 2/13/2025 |
| Frank Simuro | ▼ Sell | Tax Withholding | 7,476 | $548K | 2/13/2025 |
| Frederick G. Saint | ▼ Sell | Other | 6,452 | $0 | 2/13/2025 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 6,602 | $484K | 2/13/2025 |
| John W. Hill | ▼ Sell | Open Market | 2,735 | $210K | 12/10/2024 |
| John W. Hill | ▼ Sell | Gift | 195 | $0 | 12/10/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 64,909 | $0 | 12/10/2024 |
| NASSETTA CHRISTOPHER J | ▼ Sell | Open Market | 1,681 | $135K | 11/27/2024 |
| Michael J. Desmarais | ▼ Sell | Open Market | 5,500 | $439K | 11/26/2024 |
| Cynthia Cammett Cann | ▼ Sell | Open Market | 1,310 | $101K | 11/11/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 5,872 | $0 | 10/25/2024 |
| KLEIN MICHAEL R | ▼ Sell | Open Market | 71,633 | $5.4M | 10/25/2024 |
| Andrew C. Florance | ▲ Buy | Open Market | 14,731 | $1.1M | 10/25/2024 |
| Cynthia Cammett Cann | ▼ Sell | Open Market | 1,200 | $94K | 7/31/2024 |
| John W. Hill | ▼ Sell | Open Market | 1,325 | $104K | 7/30/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 6,346 | $0 | 7/27/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 5,344 | $0 | 7/27/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 4,810 | $0 | 7/27/2024 |
| Cynthia Cammett Cann | ▲ Buy | Grant | 9,553 | $0 | 7/26/2024 |
| Frederick G. Saint | ▲ Buy | Grant | 12,738 | $0 | 7/26/2024 |
| KLEIN MICHAEL R | ▲ Buy | Grant | 3,781 | $0 | 7/17/2024 |
| Angelique G. Brunner | ▲ Buy | Grant | 3,491 | $0 | 7/17/2024 |
| Louise S. Sams | ▲ Buy | Grant | 3,491 | $0 | 7/17/2024 |
| Robert W. Musslewhite | ▲ Buy | Grant | 3,293 | $0 | 7/17/2024 |
| Kaplan Laura Cox | ▲ Buy | Grant | 3,452 | $0 | 7/17/2024 |
| John W. Hill | ▲ Buy | Grant | 3,689 | $0 | 7/17/2024 |
| NASSETTA CHRISTOPHER J | ▲ Buy | Grant | 3,781 | $0 | 7/17/2024 |
| Christian M. Lown | ▲ Buy | Grant | 33,839 | $0 | 7/1/2024 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 11 | $860 | 6/1/2024 |
| Frederick G. Saint | ▼ Sell | Open Market | 2,500 | $221K | 5/16/2024 |
| Lisa Ruggles | ▼ Sell | Open Market | 20,000 | $1.8M | 5/9/2024 |
| NASSETTA CHRISTOPHER J | ▼ Sell | Gift | 46,000 | $0 | 5/7/2024 |
| NASSETTA CHRISTOPHER J | ▼ Sell | Gift | 46,000 | $0 | 5/7/2024 |
| Michael J. Desmarais | ▼ Sell | Open Market | 3,800 | $352K | 4/26/2024 |
| Wheeler Scott T | ▲ Buy | Option Exercise | 42,670 | $1.7M | 4/26/2024 |
| Wheeler Scott T | ▲ Buy | Option Exercise | 51,000 | $3.4M | 4/26/2024 |
| Wheeler Scott T | ▲ Buy | Option Exercise | 21,933 | $1.5M | 4/26/2024 |
| Wheeler Scott T | ▲ Buy | Option Exercise | 7,133 | $548K | 4/26/2024 |
| Wheeler Scott T | ▼ Sell | Open Market | 122,736 | $11.4M | 4/26/2024 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 2,267 | $199K | 3/15/2024 |
| Frank Simuro | ▼ Sell | Tax Withholding | 5,128 | $451K | 3/15/2024 |
| Wheeler Scott T | ▼ Sell | Tax Withholding | 8,444 | $742K | 3/15/2024 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 666 | $59K | 3/15/2024 |
| Gene Boxer | ▼ Sell | Tax Withholding | 372 | $33K | 3/15/2024 |
| Wheeler Scott T | ▼ Sell | Gift | 1,187 | $0 | 3/12/2024 |
| Wheeler Scott T | ▼ Sell | Gift | 415 | $0 | 3/12/2024 |
| Wheeler Scott T | ▼ Sell | Gift | 357 | $0 | 3/12/2024 |
| Wheeler Scott T | ▼ Sell | Gift | 415 | $0 | 3/12/2024 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 24,228 | $2.1M | 3/1/2024 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 6,351 | $553K | 3/1/2024 |
| Frank Simuro | ▼ Sell | Tax Withholding | 6,091 | $530K | 3/1/2024 |
| Wheeler Scott T | ▲ Buy | Grant | 21,308 | — | 3/1/2024 |
| Wheeler Scott T | ▼ Sell | Tax Withholding | 10,121 | $881K | 3/1/2024 |
| Gene Boxer | ▲ Buy | Grant | 8,694 | — | 3/1/2024 |
| Gene Boxer | ▼ Sell | Tax Withholding | 1,238 | $108K | 3/1/2024 |
| Michael J. Desmarais | ▲ Buy | Grant | 6,924 | — | 3/1/2024 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 1,829 | $159K | 3/1/2024 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 6,091 | $530K | 3/1/2024 |
| Frank Simuro | ▼ Sell | Other | 7,200 | $0 | 2/22/2024 |
| Frank Simuro | ▼ Sell | Tax Withholding | 4,527 | $380K | 2/22/2024 |
| Frank Simuro | ▲ Buy | Grant | 126,480 | $0 | 2/22/2024 |
| Frederick G. Saint | ▼ Sell | Other | 8,000 | $0 | 2/22/2024 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 4,881 | $410K | 2/22/2024 |
| Frederick G. Saint | ▲ Buy | Grant | 69,160 | $0 | 2/22/2024 |
| Wheeler Scott T | ▼ Sell | Other | 10,400 | $0 | 2/22/2024 |
| Wheeler Scott T | ▼ Sell | Tax Withholding | 5,347 | $449K | 2/22/2024 |
| Michael J. Desmarais | ▲ Buy | Grant | 16,976 | $0 | 2/22/2024 |
| Lisa Ruggles | ▼ Sell | Other | 7,200 | $0 | 2/22/2024 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 4,428 | $372K | 2/22/2024 |
| Lisa Ruggles | ▲ Buy | Grant | 57,560 | $0 | 2/22/2024 |
| Gene Boxer | ▲ Buy | Grant | 18,189 | $0 | 2/22/2024 |
| Andrew C. Florance | ▼ Sell | Other | 31,200 | $0 | 2/22/2024 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 22,058 | $1.9M | 2/22/2024 |
| Andrew C. Florance | ▲ Buy | Grant | 367,840 | $0 | 2/22/2024 |
| Wheeler Scott T | ▼ Sell | Tax Withholding | 3,462 | $285K | 2/15/2024 |
| Andrew C. Florance | ▼ Sell | Tax Withholding | 16,296 | $1.3M | 2/15/2024 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 2,367 | $195K | 2/15/2024 |
| Frederick G. Saint | ▼ Sell | Tax Withholding | 2,349 | $193K | 2/15/2024 |
| Frank Simuro | ▼ Sell | Tax Withholding | 4,233 | $348K | 2/15/2024 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 60,000 | $0 | 11/29/2023 |
| John W. Hill | ▼ Sell | Open Market | 3,020 | $254K | 11/28/2023 |
| NASSETTA CHRISTOPHER J | ▼ Sell | Open Market | 1,500 | $117K | 11/8/2023 |
| John W. Hill | ▲ Buy | Grant | 3,956 | $0 | 10/30/2023 |
| Angelique G. Brunner | ▲ Buy | Grant | 3,532 | $0 | 10/30/2023 |
| Kaplan Laura Cox | ▲ Buy | Grant | 3,702 | $0 | 10/30/2023 |
| Glosserman Michael J | ▲ Buy | Grant | 3,913 | $0 | 10/30/2023 |
| NASSETTA CHRISTOPHER J | ▲ Buy | Grant | 4,055 | $0 | 10/30/2023 |
| Louise S. Sams | ▲ Buy | Grant | 3,744 | $0 | 10/30/2023 |
| KLEIN MICHAEL R | ▲ Buy | Grant | 4,055 | $0 | 10/30/2023 |
| Robert W. Musslewhite | ▲ Buy | Grant | 3,532 | $0 | 10/30/2023 |
| Michael J. Desmarais | ▼ Sell | Tax Withholding | 1,663 | $128K | 10/1/2023 |
| Lisa Ruggles | ▼ Sell | Open Market | 30,474 | $2.8M | 6/30/2023 |
| Wheeler Scott T | ▼ Sell | Open Market | 21,530 | $1.9M | 6/28/2023 |
| Frank Simuro | ▼ Sell | Open Market | 92,300 | $8.3M | 6/27/2023 |
| John W. Hill | ▼ Sell | Open Market | 1,500 | $130K | 6/26/2023 |
| Wheeler Scott T | ▼ Sell | Open Market | 24,670 | $2.0M | 6/12/2023 |
| Frederick G. Saint | ▼ Sell | Open Market | 30,000 | $2.4M | 6/7/2023 |
| Lisa Ruggles | ▼ Sell | Tax Withholding | 11 | $873 | 6/1/2023 |
| KLEIN MICHAEL R | ▼ Sell | Gift | 3,977 | $0 | 5/23/2023 |