COSTAR GROUP, INC. (CSGP) Insider Transactions
Over the last 12 months, 15 COSTAR GROUP, INC. (CSGP) insiders filed 60 SEC Form 4 transactions — $6.0M in open-market purchases ( 4 distinct buyers) and $5.1M in open-market sales. 0% of all transactions were executed under a pre-scheduled Rule 10b5-1 trading plan.
- $6.0MOpen-market buys (1y)
- $5.1MOpen-market sells (1y)
- 15Distinct insiders
- 60Transactions filed
- 0%Under Rule 10b5-1 plan
- 2026-05-01Latest filing
Recent Form 4 Filings Most recent 50 of 60 (1-year window)
Each row is a single Form 4 filing event for CSGP, sourced directly from SEC EDGAR. The Type column classifies the SEC transaction code into Buy / Sell / Grant / Exercise / Other; the 10b5-1 badge marks trades executed under a pre-scheduled SEC Rule 10b5-1 plan.
| Date | Insider | Title | Type | SEC Code | Value | Shares | Price |
|---|---|---|---|---|---|---|---|
| 2026-05-01 | FLORANCE ANDREW C | President and CEO | Buy | P | $2.4M | 68,330 | $35.17 |
| 2026-05-01 | FLORANCE ANDREW C | President and CEO | Buy | P | $111.0K | 3,100 | $35.82 |
| 2026-03-15 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $129.9K | 2,977 | $43.63 |
| 2026-03-15 | Boxer Gene | General Counsel and Secretary | Grant | — | $18.7K | 428 | $43.63 |
| 2026-03-15 | SIMURO FRANK | Chief Technology Officer | Grant | — | $484.6K | 11,107 | $43.63 |
| 2026-03-15 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Grant | — | $125.3K | 2,873 | $43.63 |
| 2026-03-15 | Cann Cynthia Cammett | Chief Accounting Officer | Grant | — | $52.1K | 1,194 | $43.63 |
| 2026-03-10 | Cann Cynthia Cammett | Chief Accounting Officer | Grant | — | $0 | 4,374 | — |
| 2026-03-10 | FLORANCE ANDREW C | President and CEO | Grant | — | $0 | 124,162 | — |
| 2026-03-10 | LOWN CHRISTIAN M. | Chief Financial Officer | Grant | — | $0 | 12,268 | — |
| 2026-03-10 | Boxer Gene | General Counsel and Secretary | Grant | — | $0 | 21,920 | — |
| 2026-03-10 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Grant | — | $0 | 17,676 | — |
| 2026-03-06 | Sams Louise S | — | Buy | — | $48.4K | 1,000 | $48.36 |
| 2026-03-02 | Glaser Rachel C | — | Buy | — | $44.9K | 1,000 | $44.94 |
| 2026-03-02 | SAINT FREDERICK G. | President, Marketplaces | Buy | — | $906.6K | 20,000 | $45.33 |
| 2026-03-01 | LOWN CHRISTIAN M. | Chief Financial Officer | Grant | — | $320.2K | 7,175 | $44.63 |
| 2026-03-01 | FLORANCE ANDREW C | President and CEO | Grant | — | $2.7M | 59,593 | $44.63 |
| 2026-03-01 | Boxer Gene | General Counsel and Secretary | Grant | — | $202.9K | 4,547 | $44.63 |
| 2026-03-01 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Grant | — | $283.5K | 6,353 | $44.63 |
| 2026-03-01 | Cann Cynthia Cammett | Chief Accounting Officer | Grant | — | $61.8K | 1,385 | $44.63 |
| 2026-03-01 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $398.6K | 8,931 | $44.63 |
| 2026-03-01 | SIMURO FRANK | Chief Technology Officer | Grant | — | $834.7K | 18,702 | $44.63 |
| 2026-03-01 | SAINT FREDERICK G. | President, Marketplaces | Grant | — | $495.2K | 11,096 | $44.63 |
| 2026-02-27 | FLORANCE ANDREW C | President and CEO | Buy | — | $2.5M | 55,720 | $44.52 |
| 2026-02-27 | LOWN CHRISTIAN M. | Chief Financial Officer | Grant | — | $0 | 39,652 | $0.00 |
| 2026-02-27 | SAINT FREDERICK G. | President, Marketplaces | Grant | — | $0 | 39,652 | $0.00 |
| 2026-02-27 | FLORANCE ANDREW C | President and CEO | Grant | — | $0 | 83,708 | $0.00 |
| 2026-02-27 | Boxer Gene | General Counsel and Secretary | Grant | — | $0 | 26,888 | $0.00 |
| 2026-02-27 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Grant | — | $0 | 17,926 | $0.00 |
| 2026-02-27 | Cann Cynthia Cammett | Chief Accounting Officer | Grant | — | $0 | 6,834 | $0.00 |
| 2026-02-27 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $0 | 28,197 | $0.00 |
| 2026-02-27 | SIMURO FRANK | Chief Technology Officer | Grant | — | $0 | 52,869 | $0.00 |
| 2026-02-19 | SIMURO FRANK | Chief Technology Officer | Grant | — | $0 | 30,727 | $0.00 |
| 2026-02-19 | SIMURO FRANK | Chief Technology Officer | Grant | — | $216.9K | 4,421 | $49.07 |
| 2026-02-19 | SAINT FREDERICK G. | President, Marketplaces | Grant | — | $0 | 17,583 | $0.00 |
| 2026-02-19 | SAINT FREDERICK G. | President, Marketplaces | Grant | — | $105.5K | 2,149 | $49.07 |
| 2026-02-19 | FLORANCE ANDREW C | President and CEO | Grant | — | $0 | 104,983 | $0.00 |
| 2026-02-19 | FLORANCE ANDREW C | President and CEO | Grant | — | $943.2K | 19,221 | $49.07 |
| 2026-02-19 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $0 | 17,583 | $0.00 |
| 2026-02-19 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $158.0K | 3,219 | $49.07 |
| 2026-02-15 | SIMURO FRANK | Chief Technology Officer | Grant | — | $186.8K | 4,151 | $44.99 |
| 2026-02-15 | FLORANCE ANDREW C | President and CEO | Grant | — | $786.5K | 17,482 | $44.99 |
| 2026-02-15 | Ruggles Lisa | Senior VP, Global Operations | Grant | — | $160.9K | 3,576 | $44.99 |
| 2026-02-15 | SAINT FREDERICK G. | President, Marketplaces | Grant | — | $109.1K | 2,424 | $44.99 |
| 2025-11-13 | Hill John W | — | Sell | — | $154.5K | 2,250 | $68.68 |
| 2025-11-13 | Cann Cynthia Cammett | Chief Accounting Officer | Sell | — | $126.6K | 1,841 | $68.79 |
| 2025-09-09 | McCarthy Christine M | — | Grant | — | $0 | 2,973 | $0.00 |
| 2025-09-09 | Sams Louise S | — | Grant | — | $0 | 3,291 | $0.00 |
| 2025-09-09 | BERISFORD JOHN L | — | Grant | — | $0 | 2,973 | $0.00 |
| 2025-09-09 | Hill John W | — | Grant | — | $0 | 3,177 | $0.00 |
Showing the most recent 50 of 60 transactions. For the full 1-year history with sorting, filtering, and cross-ticker industry context, open the full insider transactions drilldown.
Top Insider Buyers of CSGP By dollar volume, 1-year window
- FLORANCE ANDREW C $5.0M
- SAINT FREDERICK G. $906.6K
- Sams Louise S $48.4K
- Glaser Rachel C $44.9K
Methodology & FAQ
How We Track CSGP Insider Transactions
Form 4 disclosures are sourced directly from SEC EDGAR and re-ingested on every pipeline cycle. A complete description of transaction-code handling, the open-market vs grant distinction, and the Rule 10b5-1 plan-reference heuristic is documented in the Methodology.
What is an SEC Form 4 filing for COSTAR GROUP, INC.?
Form 4 is a transaction-level disclosure that corporate insiders — officers, directors, and beneficial owners of more than 10% of a registered class of equity securities — must file with the SEC within two business days of any change in their beneficial ownership of COSTAR GROUP, INC. (CSGP) shares.
What is a Rule 10b5-1 trading plan?
Rule 10b5-1 is an SEC rule that lets insiders schedule trades in advance under a written plan, providing an affirmative defense against insider-trading allegations as long as the plan was adopted in good faith and not while in possession of material non-public information. Form 4 rows marked "10b5-1" on this page indicate the underlying trade was executed under such a plan; rows without the badge are discretionary or did not reference a plan in the Form 4 footnotes.
How is "insider buying" different from a stock grant or option exercise?
An insider buy (SEC transaction code P) is an open-market purchase of COSTAR GROUP, INC. (CSGP) stock executed at the prevailing market price using the insider's personal capital. Stock grants (code A) and option exercises (code M) are compensation events, not directional trades; they are tracked separately and excluded from the "conviction" signal because they are not discretionary purchases.
How recent is the data?
Form 4 transactions are typically reported within two business days of execution. Pactolio re-ingests the EDGAR feed on a nightly cycle and reflects new filings on the next ingest run, typically within 24 hours of EDGAR acceptance. The table on this page covers the most recent 1-year window.