CSGP SEC Form 4 filings
Costar Group, Inc. Latest Insider Trading Activity
Over the past 446 days, 11 insider trades from Costar Group, Inc. (CSGP). The most recent SEC Form 4 filing shows 2 purchases by Florance Andrew C (Costar Group, Inc. President and CEO) totaling 71,430 shares at a weighted-average price of $35.20 per share, with the latest transaction dated May 1, 2026. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
Insider Trading For CSGP Charted on Daily Candles. Scroll left or zoom out to load earlier candles (up to 2 years).
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2026-05-04 | 2026-05-01 | Costar Group, Inc. | Florance Andrew C | President and CEO | Buy | 2 | 71,430 | $35.20 | $2,514,208.10 | 2.07% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2026-03-09 | 2026-03-06 | Costar Group, Inc. | Sams Louise S | Director | Buy | 1 | 1,000 | $48.36 | $48,360.00 | 4.90% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2026-03-03 | 2026-03-02 | Costar Group, Inc. | Glaser Rachel C | Director | Buy | 1 | 1,000 | $44.94 | $44,940.00 | 24.06% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2026-03-03 | 2026-03-02 | Costar Group, Inc. | Saint Frederick G. | President, Marketplaces | Buy | 1 | 20,000 | $45.33 | $906,600.00 | 7.15% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2026-03-02 | 2026-02-27 | Costar Group, Inc. | Florance Andrew C | President and CEO | Buy | 1 | 55,720 | $44.52 | $2,480,654.40 | 3.51% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2025-11-17 | 2025-11-13 | Costar Group, Inc. | Hill John W | Director | Sell | 1 | 2,250 | $68.68 | $154,530.00 | 10.99% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2025-11-17 | 2025-11-13 | Costar Group, Inc. | Cann Cynthia Cammett | Chief Accounting Officer | Sell | 1 | 1,841 | $68.79 | $126,642.39 | 7.35% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2025-09-02 | 2025-08-28 | Costar Group, Inc. | Saint Frederick G. | President, Marketplaces | Sell | 1 | 25,000 | $90.33 | $2,258,250.00 | 7.86% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2025-07-29 | 2025-07-28 | Costar Group, Inc. | Saint Frederick G. | President, Marketplaces | Sell | 1 | 25,000 | $93.23 | $2,330,750.00 | 7.26% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. CSGP | 2025-07-29 | 2025-07-28 | Costar Group, Inc. | Cann Cynthia Cammett | Chief Accounting Officer | Sell | 1 | 2,033 | $92.85 | $188,764.05 | 7.31% | View Filing |
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