COSTAR GROUP, INC. (CSGP)
$32.04+$0.70 (+2.23%) Today
John W. Hill - DirectorCoStar Group is a global provider of proprietary information, analytics, and online marketplaces serving both commercial and residential real estate. The firm operates through a diverse portfolio of brands, including CoStar Suite for commercial real estate research, LoopNet for commercial listings, Apartments.com for multifamily rentals, and Homes.com for residential brokerage. It primarily sells high-margin software-as-a-service subscriptions that provide institutional clients with forensic property data and premium advertising visibility. With operations across North America, Europe, and Asia-Pacific, CoStar maintains the industry's most comprehensive centralized real estate database, functioning as a critical information utility for brokers, lenders, and owners worldwide.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market purchase | 1 | 83,300 | $2.49M |
| Open-market sale | 2 | 8,288 | $253K |
| Grant or award | 9 | 118,683 | |
| Tax withholding / forfeiture | 4 | 8,571 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
70 Form 4 filings on record, the earliest from Oct 28, 2024, newest first. Filing history page 1 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Cynthia Cammett Cann - Officer | Open-market sale | Common Stock, par value $0.01 per share | 4,788 | $30.78 | $147K | |
| John W. Hill - Director | Open-market sale | Common Stock, par value $0.01 per share | 3,500 | $30.21 | $106K | |
| Andrew C. Florance - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 83,300 | $29.89 | $2.49M | |
| Robin Jack Rossmann - Officer | Grant or award | Restricted Stock Units | 34,771 | $0.00 | - | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 1,077 | $28.76 | $31K | |
| Cynthia Cammett Cann - Officer | Grant or award | Restricted Stock Units | 26,078 | $0.00 | - | |
| Frederick G. Saint - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 1,436 | $28.76 | $41K | |
 Christian M. Lown - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 5,597 | $29.36 | $164K | |
 Rachel C. Glaser - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
| John L. Berisford - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
| John W. Hill - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
| Angelique G. Brunner - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
 Robert W. Musslewhite - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
| Louise S. Sams - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
 Christine M. McCarthy - Director | Grant or award | Common Stock, par value $0.01 per share | 8,262 | $0.00 | - | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 461 | $32.04 | $15K | |
| Andrew C. Florance - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 68,330 | $35.17 | $2.40M | |
| Andrew C. Florance - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 3,100 | $35.82 | $111K | |
| Lisa Ruggles - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 2,977 | $43.63 | $130K | |
| Gene Boxer - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 428 | $43.63 | $19K | |
| Frank Simuro - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 11,107 | $43.63 | $485K | |
| Michael J. Desmarais - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 2,873 | $43.63 | $125K | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 1,194 | $43.63 | $52K | |
| Cynthia Cammett Cann - Officer | Grant or award | Common Stock, par value $0.01 per share | 4,374 | - | - | |
| Andrew C. Florance - Officer | Grant or award | Common Stock, par value $0.01 per share | 124,162 | - | - | |
| Christian M. Lown - Officer | Grant or award | Common Stock, par value $0.01 per share | 12,268 | - | - | |
| Gene Boxer - Officer | Grant or award | Common Stock, par value $0.01 per share | 21,920 | - | - | |
| Michael J. Desmarais - Officer | Grant or award | Common Stock, par value $0.01 per share | 17,676 | - | - | |
| Louise S. Sams - Director | Open-market purchase | Common Stock, par value $0.01 per share | 1,000 | $48.36 | $48K | |
| Christian M. Lown - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 7,175 | $44.63 | $320K | |
| Christian M. Lown - Officer | Grant or award | Restricted Stock Units | 39,652 | $0.00 | - | |
| Frederick G. Saint - Officer | Grant or award | Restricted Stock Units | 39,652 | $0.00 | - | |
| Andrew C. Florance - Officer | Grant or award | Restricted Stock Units | 83,708 | $0.00 | - | |
| Andrew C. Florance - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 59,593 | $44.63 | $2.66M |
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| Hill John W | Director | 3,500 | $106K | View on EDGAR |
COSTAR GROUP, INC. (CSGP) had 15 insider filings in the last 90 days, with the most recent on 2026-08-10. The full record for CSGP runs to 70 Form 4 filings, the earliest from 2024-10-28. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
1 insider purchase of CSGP was filed in the last 90 days, totaling $2.49M.
2 insider sales of CSGP were filed in the last 90 days, totaling $253K.
This page tracks CSGP Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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