Robert W Musslewhite Costar Group, Inc. (CSGP) insider trading activity

Robert W Musslewhite is Director of COSTAR GROUP, INC.. Currently has a direct ownership of 18,277 shares of CSGP, which is worth approximately $1.58 Million. The most recent transaction as insider was on Sep 09, 2025, when has been sold 3,121 shares (Common Stock, par value $0.01 per share) at a price of $0.0 per share, resulting in proceeds of $0. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 18.3K

20.59% 3M change

20.59% 12M change

Total Value Held $1.58 Million

Robert W Musslewhite Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Sep 09 2025	BUY Grant, award, or other acquisition	-	3,121 Added 14.59%	18,277 Common Stock, par valu...
Jul 17 2024	BUY Grant, award, or other acquisition	-	3,293 Added 17.85%	15,156 Common Stock, par valu...
Oct 30 2023	BUY Grant, award, or other acquisition	-	3,532 Added 22.94%	11,863 Common Stock, par valu...
Sep 14 2022	BUY Grant, award, or other acquisition	-	3,380 Added 28.86%	8,331 Common Stock, par valu...
Sep 15 2021	BUY Grant, award, or other acquisition	$250,038 $88.95 p/Share	2,811 Added 36.21%	4,951 Common Stock, par valu...

Also insider at

Definitive Healthcare Corp. Healthcare

Chief Executive Officer

CAH

CARDINAL HEALTH INC Healthcare

Director

RWM