Michael J Desmarais Costar Group, Inc. (CSGP) insider trading activity

Michael J Desmarais is Chief Human Resources Officer of COSTAR GROUP, INC.. Currently has a direct ownership of 79,118 shares of CSGP, which is worth approximately $6.21 Million. The most recent transaction as insider was on Mar 15, 2025, when has been sold 3,641 shares (Common Stock, par value $0.01 per share) at a price of $78.73 per share, resulting in proceeds of $286,655. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 79.1K

34.56% 3M change

16.54% 12M change

Total Value Held $6.21 Million

MICHAEL J DESMARAIS Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Mar 15 2025	SELL Payment of exercise price or tax liability	$286,655 $78.73 p/Share	3,641 Reduced 4.4%	79,118 Common Stock, par valu...
Mar 05 2025	BUY Grant, award, or other acquisition	-	9,026 Added 9.83%	82,759 Common Stock, par valu...
Mar 01 2025	SELL Payment of exercise price or tax liability	$296,841 $76.25 p/Share	3,893 Reduced 5.02%	73,733 Common Stock, par valu...
Feb 27 2025	BUY Grant, award, or other acquisition	-	18,828 Added 19.52%	77,626 Common Stock, par valu...
Nov 26 2024	SELL Open market or private sale	$439,340 $79.88 p/Share	5,500 Reduced 8.55%	58,798 Common Stock, par valu...
Apr 26 2024	SELL Open market or private sale	$352,146 $92.67 p/Share	3,800 Reduced 5.6%	64,087 Common Stock, par valu...
Mar 15 2024	SELL Payment of exercise price or tax liability	$199,201 $87.87 p/Share	2,267 Reduced 3.23%	67,887 Common Stock, par valu...
Mar 01 2024	SELL Payment of exercise price or tax liability	$159,177 $87.03 p/Share	1,829 Reduced 2.54%	70,154 Common Stock, par valu...
Mar 01 2024	BUY Grant, award, or other acquisition	-	6,924 Added 8.77%	71,983 Common Stock, par valu...
Feb 22 2024	BUY Grant, award, or other acquisition	-	16,976 Added 20.69%	65,059 Common Stock, par valu...
Oct 01 2023	SELL Payment of exercise price or tax liability	$127,868 $76.89 p/Share	1,663 Reduced 3.62%	44,265 Common Stock, par valu...
Mar 15 2023	SELL Payment of exercise price or tax liability	$149,440 $67.62 p/Share	2,210 Reduced 4.59%	45,928 Common Stock, par valu...
Mar 15 2023	BUY Grant, award, or other acquisition	-	3,292 Added 6.4%	48,138 Common Stock, par valu...
Mar 08 2023	SELL Open market or private sale	$394,016 $70.36 p/Share	5,600 Reduced 11.1%	44,846 Common Stock, par valu...
Mar 01 2023	SELL Payment of exercise price or tax liability	$41,901 $70.66 p/Share	593 Reduced 1.16%	50,446 Common Stock, par valu...
Feb 24 2023	BUY Grant, award, or other acquisition	$1,000,051 $70.73 p/Share	14,139 Added 21.69%	51,039 Common Stock, par valu...
Oct 28 2022	SELL Open market or private sale	$107,322 $82.81 p/Share	1,296 Reduced 3.39%	36,900 Common Stock, par valu...
Oct 01 2022	SELL Payment of exercise price or tax liability	$99,112 $69.65 p/Share	1,423 Reduced 3.59%	38,196 Common Stock, par valu...
Aug 03 2022	SELL Open market or private sale	$145,020 $72.51 p/Share	2,000 Reduced 4.81%	39,619 Common Stock, par valu...
May 02 2022	SELL Open market or private sale	$63,140 $63.14 p/Share	1,000 Reduced 2.35%	41,619 Common Stock, par valu...

MJD

Michael J Desmarais

Chief Human Resources Officer

Washington, DC

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