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 2 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Gene Boxer - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 4,547 | $44.63 | $203K | |
| Gene Boxer - Officer | Grant or award | Restricted Stock Units | 26,888 | $0.00 | - | |
| Michael J. Desmarais - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 6,353 | $44.63 | $284K | |
| Michael J. Desmarais - Officer | Grant or award | Restricted Stock Units | 17,926 | $0.00 | - | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 1,385 | $44.63 | $62K | |
| Cynthia Cammett Cann - Officer | Grant or award | Restricted Stock Units | 6,834 | $0.00 | - | |
| Lisa Ruggles - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 8,931 | $44.63 | $399K | |
| Lisa Ruggles - Officer | Grant or award | Restricted Stock Units | 28,197 | $0.00 | - | |
| Frank Simuro - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 18,702 | $44.63 | $835K | |
| Frank Simuro - Officer | Grant or award | Restricted Stock Units | 52,869 | $0.00 | - | |
 Rachel C. Glaser - Director | Open-market purchase | Common Stock, par value $0.01 per share | 1,000 | $44.94 | $45K | |
| Frederick G. Saint - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 11,096 | $44.63 | $495K | |
| Frederick G. Saint - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 20,000 | $45.33 | $907K | |
| Andrew C. Florance - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 55,720 | $44.52 | $2.48M | |
| Frank Simuro - Officer | Derivative | Common Stock, par value $0.01 per share | 30,727 | $0.00 | - | |
| Frank Simuro - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 4,421 | $49.07 | $217K | |
| Frederick G. Saint - Officer | Derivative | Common Stock, par value $0.01 per share | 17,583 | $0.00 | - | |
| Frederick G. Saint - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 2,149 | $49.07 | $105K | |
| Andrew C. Florance - Officer | Derivative | Common Stock, par value $0.01 per share | 104,983 | $0.00 | - | |
| Andrew C. Florance - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 19,221 | $49.07 | $943K | |
| Lisa Ruggles - Officer | Derivative | Common Stock, par value $0.01 per share | 17,583 | $0.00 | - | |
| Lisa Ruggles - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 3,219 | $49.07 | $158K | |
| Frank Simuro - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 4,151 | $44.99 | $187K | |
| Andrew C. Florance - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 17,482 | $44.99 | $787K | |
| Lisa Ruggles - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 3,576 | $44.99 | $161K | |
| Frederick G. Saint - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 2,424 | $44.99 | $109K | |
| Cynthia Cammett Cann - Officer | Open-market sale | Common Stock, par value $0.01 per share | 1,841 | $68.79 | $127K | |
| John W. Hill - Director | Open-market sale | Common Stock, par value $0.01 per share | 2,250 | $68.68 | $155K | |
| Angelique G. Brunner - Director | Grant or award | Common Stock, par value $0.01 per share | 3,143 | $0.00 | - | |
| John W. Hill - Director | Grant or award | Common Stock, par value $0.01 per share | 3,177 | $0.00 | - | |
| Louise S. Sams - Director | Grant or award | Common Stock, par value $0.01 per share | 3,291 | $0.00 | - | |
 Robert W. Musslewhite - Director | Grant or award | Common Stock, par value $0.01 per share | 3,121 | $0.00 | - | |
 Christine M. McCarthy - Director | Grant or award | Common Stock, par value $0.01 per share | 2,973 | $0.00 | - | |
| John L. Berisford - Director | Grant or award | Common Stock, par value $0.01 per share | 2,973 | $0.00 | - | |
| Rachel C. Glaser - Director | Grant or award | Common Stock, par value $0.01 per share | 3,143 | $0.00 | - | |
| Frederick G. Saint - Officer | Open-market sale | Common Stock, par value $0.01 per share | 25,000 | $90.33 | $2.26M | |
| Frederick G. Saint - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 1,436 | $95.19 | $137K | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 719 | $95.19 | $68K | |
| Frederick G. Saint - Officer | Open-market sale | Common Stock, par value $0.01 per share | 25,000 | $93.23 | $2.33M | |
| Cynthia Cammett Cann - Officer | Open-market sale | Common Stock, par value $0.01 per share | 2,033 | $92.85 | $189K |
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.
Create a free InsiderAlpha account and press Watch on this page to add CSGP to your watchlist. A free account also opens the full scored daily plan with every past day and 3 months of price history. No card is required. Sign up at https://insideralpha.ai/register.
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.
Real-time Form 4 alerts, AI-scored daily trade ideas and 10b5-1 plan flags.
