CSGP
CoStar Group Inc
NASDAQ: CSGP · REAL ESTATE · REAL ESTATE SERVICES
$32.92
+0.68% today
Updated 2026-06-05
Market cap
$13.41B
P/E ratio
469.14
P/S ratio
3.93x
EPS (TTM)
$0.07
Dividend yield
—
52W range
$31 – $97
Volume
7.3M
CoStar Group Inc (CSGP) Insider transactions
Net insider activity
Net buying (1,260,155 shares)
Buy transactions
43
Sell transactions
57
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-01 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 68,330 | $35.17 | $2.40M |
| 2026-05-01 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 3,100 | $35.82 | $111042.00 |
| 2026-03-15 | SIMURO, FRANK | Chief Technology Officer | Sale | 11,107 | $43.63 | $484598.41 |
| 2026-03-15 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 2,977 | $43.63 | $129886.51 |
| 2026-03-15 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Sale | 2,873 | $43.63 | $125348.99 |
| 2026-03-15 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 1,194 | $43.63 | $52094.22 |
| 2026-03-15 | BOXER, GENE | General Counsel and Secretary | Sale | 482 | $43.63 | $21029.66 |
| 2026-03-15 | BOXER, GENE | General Counsel and Secretary | Sale | 428 | $43.63 | $18673.64 |
| 2026-03-10 | LOWN, CHRISTIAN M. | Chief Financial Officer | Buy | 12,268 | — | — |
| 2026-03-10 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 124,162 | — | — |
| 2026-03-10 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Buy | 17,676 | — | — |
| 2026-03-10 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Buy | 4,374 | — | — |
| 2026-03-10 | BOXER, GENE | General Counsel and Secretary | Buy | 21,920 | — | — |
| 2026-03-06 | SAMS, LOUISE S | Director | Buy | 1,000 | $48.36 | $48360.00 |
| 2026-03-02 | SAINT, FREDERICK G. | President, Marketplaces | Buy | 20,000 | $45.33 | $906600.00 |
| 2026-03-02 | GLASER, RACHEL C | Director | Buy | 1,000 | $44.94 | $44940.00 |
| 2026-03-01 | SIMURO, FRANK | Chief Technology Officer | Sale | 18,702 | $44.63 | $834670.26 |
| 2026-03-01 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 11,096 | $44.63 | $495214.48 |
| 2026-03-01 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 8,931 | $44.63 | $398590.53 |
| 2026-03-01 | LOWN, CHRISTIAN M. | Chief Financial Officer | Sale | 7,175 | $44.63 | $320220.25 |
| 2026-03-01 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 59,593 | $44.63 | $2.66M |
| 2026-03-01 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Sale | 6,353 | $44.63 | $283534.39 |
| 2026-03-01 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 1,385 | $44.63 | $61812.55 |
| 2026-03-01 | BOXER, GENE | General Counsel and Secretary | Sale | 4,547 | $44.63 | $202932.61 |
| 2026-02-27 | SIMURO, FRANK | Chief Technology Officer | Buy | 52,869 | — | — |
| 2026-02-27 | SAINT, FREDERICK G. | President, Marketplaces | Buy | 39,652 | — | — |
| 2026-02-27 | RUGGLES, LISA | Senior VP, Global Operations | Buy | 28,197 | — | — |
| 2026-02-27 | LOWN, CHRISTIAN M. | Chief Financial Officer | Buy | 39,652 | — | — |
| 2026-02-27 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 83,708 | — | — |
| 2026-02-27 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 55,720 | $44.52 | $2.48M |
| 2026-02-27 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Buy | 17,926 | — | — |
| 2026-02-27 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Buy | 6,834 | — | — |
| 2026-02-27 | BOXER, GENE | General Counsel and Secretary | Buy | 26,888 | — | — |
| 2026-02-19 | SIMURO, FRANK | Chief Technology Officer | Sale | 30,727 | — | — |
| 2026-02-19 | SIMURO, FRANK | Chief Technology Officer | Sale | 4,421 | $49.07 | $216938.47 |
| 2026-02-19 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 17,583 | — | — |
| 2026-02-19 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 2,149 | $49.07 | $105451.43 |
| 2026-02-19 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 17,583 | — | — |
| 2026-02-19 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 3,219 | $49.07 | $157956.33 |
| 2026-02-19 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 104,983 | — | — |
| 2026-02-19 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 19,221 | $49.07 | $943174.47 |
| 2026-02-15 | SIMURO, FRANK | Chief Technology Officer | Sale | 4,151 | $44.99 | $186753.49 |
| 2026-02-15 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 2,424 | $44.99 | $109055.76 |
| 2026-02-15 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 3,576 | $44.99 | $160884.24 |
| 2026-02-15 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 17,482 | $44.99 | $786515.18 |
| 2025-11-13 | HILL, JOHN W | Director | Sale | 2,250 | $68.68 | $154530.00 |
| 2025-11-13 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 1,841 | $68.79 | $126642.39 |
| 2025-09-09 | SAMS, LOUISE S | Director | Buy | 3,291 | — | — |
| 2025-09-09 | MUSSLEWHITE, ROBERT W | Director | Buy | 3,121 | — | — |
| 2025-09-09 | MCCARTHY, CHRISTINE M | Director | Buy | 2,973 | — | — |
| 2025-09-09 | HILL, JOHN W | Director | Buy | 3,177 | — | — |
| 2025-09-09 | GLASER, RACHEL C | Director | Buy | 3,143 | — | — |
| 2025-09-09 | BRUNNER, ANGELIQUE G. | Director | Buy | 3,143 | — | — |
| 2025-09-09 | BERISFORD, JOHN L | Director | Buy | 2,973 | — | — |
| 2025-08-28 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 25,000 | $90.33 | $2.26M |
| 2025-08-01 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 1,436 | $95.19 | $136692.84 |
| 2025-08-01 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 719 | $95.19 | $68441.61 |
| 2025-07-28 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 25,000 | $93.23 | $2.33M |
| 2025-07-28 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 2,033 | $92.85 | $188764.05 |
| 2025-07-01 | LOWN, CHRISTIAN M. | Chief Financial Officer | Sale | 4,666 | $80.40 | $375146.40 |
| 2025-06-15 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 461 | $81.16 | $37414.76 |
| 2025-06-11 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 25,000 | $81.10 | $2.03M |
| 2025-06-01 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 12 | $73.56 | $882.72 |
| 2025-03-15 | SIMURO, FRANK | Chief Technology Officer | Sale | 5,700 | $78.73 | $448761.00 |
| 2025-03-15 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 1,958 | $78.73 | $154153.34 |
| 2025-03-15 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Sale | 3,641 | $78.73 | $286655.93 |
| 2025-03-15 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 1,191 | $78.73 | $93767.43 |
| 2025-03-15 | BOXER, GENE | General Counsel and Secretary | Sale | 481 | $78.73 | $37869.13 |
| 2025-03-10 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 1,749 | $79.90 | $139745.10 |
| 2025-03-05 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 76,232 | — | — |
| 2025-03-05 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Buy | 9,026 | — | — |
| 2025-03-05 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Buy | 1,498 | — | — |
| 2025-03-05 | BOXER, GENE | General Counsel and Secretary | Buy | 12,492 | — | — |
| 2025-03-01 | SIMURO, FRANK | Chief Technology Officer | Sale | 12,432 | $76.25 | $947940.00 |
| 2025-03-01 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 8,252 | $76.25 | $629215.00 |
| 2025-03-01 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 7,410 | $76.25 | $565012.50 |
| 2025-03-01 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 41,296 | $76.25 | $3.15M |
| 2025-03-01 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Sale | 3,893 | $76.25 | $296841.25 |
| 2025-03-01 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Sale | 813 | $76.25 | $61991.25 |
| 2025-03-01 | BOXER, GENE | General Counsel and Secretary | Sale | 3,644 | $76.25 | $277855.00 |
| 2025-02-27 | DESMARAIS, MICHAEL J | Chief Human Resources Officer | Buy | 18,828 | — | — |
| 2025-02-27 | CANN, CYNTHIA CAMMETT | Chief Accounting Officer | Buy | 4,035 | — | — |
| 2025-02-27 | BOXER, GENE | General Counsel and Secretary | Buy | 26,897 | — | — |
| 2025-02-20 | SIMURO, FRANK | Chief Technology Officer | Buy | 33,000 | — | — |
| 2025-02-20 | SIMURO, FRANK | Chief Technology Officer | Buy | 130,640 | — | — |
| 2025-02-20 | SAINT, FREDERICK G. | President, Marketplaces | Buy | 24,600 | — | — |
| 2025-02-20 | SAINT, FREDERICK G. | President, Marketplaces | Buy | 97,600 | — | — |
| 2025-02-20 | RUGGLES, LISA | Senior VP, Global Operations | Buy | 16,500 | — | — |
| 2025-02-20 | RUGGLES, LISA | Senior VP, Global Operations | Buy | 65,440 | — | — |
| 2025-02-20 | LOWN, CHRISTIAN M. | Chief Financial Officer | Buy | 24,600 | — | — |
| 2025-02-20 | LOWN, CHRISTIAN M. | Chief Financial Officer | Buy | 97,600 | — | — |
| 2025-02-20 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 114,000 | — | — |
| 2025-02-20 | FLORANCE, ANDREW C | Director, President and CEO | Buy | 451,440 | — | — |
| 2025-02-15 | SIMURO, FRANK | Chief Technology Officer | Sale | 5,485 | $74.06 | $406219.10 |
| 2025-02-15 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 2,349 | $74.06 | $173966.94 |
| 2025-02-15 | RUGGLES, LISA | Senior VP, Global Operations | Sale | 3,531 | $74.06 | $261505.86 |
| 2025-02-15 | FLORANCE, ANDREW C | Director, President and CEO | Sale | 14,235 | $74.06 | $1.05M |
| 2025-02-13 | SIMURO, FRANK | Chief Technology Officer | Sale | 7,476 | $73.27 | $547766.52 |
| 2025-02-13 | SIMURO, FRANK | Chief Technology Officer | Sale | 6,452 | — | — |
| 2025-02-13 | SAINT, FREDERICK G. | President, Marketplaces | Sale | 6,602 | $73.27 | $483728.54 |
Frequently asked questions
Are CSGP insiders buying or selling?
Over the transactions on record, CSGP insiders have been net sellers, with about $26.48M in stock sold across 57 sales, against 6 open-market purchases.
Does insider selling at CSGP mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which CSGP insiders are selling the most?
Recent selling is concentrated in a few names. SAINT, FREDERICK G. accounts for the largest share on record, with about $8.75M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.