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 3 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
 Christian M. Lown - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 4,666 | $80.40 | $375K | |
| Cynthia Cammett Cann - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 461 | $81.16 | $37K | |
| Frederick G. Saint - Officer | Open-market sale | Common Stock, par value $0.01 per share | 25,000 | $81.10 | $2.03M | |
| Lisa Ruggles - Officer | Tax withholding / forfeiture | Common Stock, par value $0.01 per share | 12 | $73.56 | $883 | |
| John W. Hill - Director | Open-market sale | Common Stock, par value $0.01 per share | 2,735 | $76.76 | $210K | |
| John W. Hill - Director | Gift | Common Stock, par value $0.01 per share | 195 | $0.00 | - | |
| Michael R. Klein - Director | Gift | Common Stock, par value $0.01 per share | 64,909 | $0.00 | - | |
| Christopher J. Nassetta - Director | Open-market sale | Common Stock, par value $0.01 per share | 1,681 | $80.39 | $135K | |
| Michael J. Desmarais - Officer | Open-market sale | Common Stock, par value $0.01 per share | 5,500 | $79.88 | $439K | |
| Andrew C. Florance - Officer | Open-market purchase | Common Stock, par value $0.01 per share | 14,731 | $74.67 | $1.10M | |
| Michael R. Klein - Director | Gift | Common Stock, par value $0.01 per share | 5,872 | $0.00 | - | |
| Michael R. Klein - Director | Open-market sale | Common Stock, par value $0.01 per share | 71,633 | $74.69 | $5.35M |
This is as far as the anonymous view goes. Create a free account for all 70 CSGP filings on record.
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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