Insider Transactions Reported by 20 Insiders of COSTAR GROUP, INC.

Symbol
CSGP on Nasdaq
Location
Arlington, VA

Insiders trading volume in the past year

COSTAR GROUP, INC. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
Michael R. Klein Director $148,608,311 10 Dec 2024
Andrew C. Florance President and CEO, Director $79,054,194 +$2,480,654 +3.2% 10 Mar 2026
Wheeler Scott T. Chief Financial Officer $28,627,417 26 Apr 2024
Christopher J. Nassetta Director $22,164,729 27 Nov 2024
Frank Simuro Chief Technology Officer $18,994,438 27 Feb 2026
Frederick G. Saint President, Marketplaces $12,685,645 -$5,709,900 -31% 01 Mar 2026
Michael J. Glosserman Director $8,530,163 30 Oct 2023
Lisa Ruggles Senior VP, Global Operations $7,939,319 27 Feb 2026
Christian M. Lown Chief Financial Officer $6,474,417 10 Mar 2026
Gene Boxer General Counsel and Secretary $4,592,887 10 Mar 2026
Michael J. Desmarais Chief Human Resources Officer $4,336,926 10 Mar 2026
Robert W. Musslewhite Director $1,600,334 09 Sep 2025
Laura Cox Kaplan Director $1,393,984 17 Jul 2024
Cynthia Cammett Cann Chief Accounting Officer $1,260,991 -$315,406 -20% 10 Mar 2026
John W. Hill Director $1,252,105 -$154,530 -11% 13 Nov 2025
Louise S. Sams Director $986,979 +$48,360 +5.2% 06 Mar 2026
Angelique G. Brunner Director $890,134 09 Sep 2025
Christine M. McCarthy Director $260,315 09 Sep 2025
John L. Berisford Director $260,315 09 Sep 2025
Rachel C. Glaser Director $186,815 +$44,940 +32% 02 Mar 2026

Recent Insider Transactions by Companies or Individuals for COSTAR GROUP, INC.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
Cynthia Cammett Cann CSGP Common Stock, par value $0.01 per share Award 19.9% 4,374 26,342 10 Mar 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Award 8.13% 124,162 1,651,435 10 Mar 2026 Direct
Christian M. Lown CSGP Common Stock, par value $0.01 per share Award 9.98% 12,268 135,250 10 Mar 2026 Direct
Gene Boxer CSGP Common Stock, par value $0.01 per share Award 29.6% 21,920 95,945 10 Mar 2026 Direct
Michael J. Desmarais CSGP Common Stock, par value $0.01 per share Award 24.2% 17,676 90,598 10 Mar 2026 Direct
Louise S. Sams CSGP Common Stock, par value $0.01 per share Purchase 5.15% $48,360 $48.36 1,000 20,409 06 Mar 2026 Direct
Rachel C. Glaser CSGP Common Stock, par value $0.01 per share Purchase 31.7% $44,940 $44.94 1,000 4,157 02 Mar 2026 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Purchase 7.7% $906,600 $45.33 20,000 279,851 02 Mar 2026 Direct
Christian M. Lown CSGP Common Stock, par value $0.01 per share Tax liability -5.51% -7,175 122,982 01 Mar 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Tax liability -3.76% -59,593 1,527,273 01 Mar 2026 Direct
Gene Boxer CSGP Common Stock, par value $0.01 per share Tax liability -5.79% -4,547 74,025 01 Mar 2026 Direct
Michael J. Desmarais CSGP Common Stock, par value $0.01 per share Tax liability -8.01% -6,353 72,922 01 Mar 2026 Direct
Cynthia Cammett Cann CSGP Common Stock, par value $0.01 per share Tax liability -5.93% -1,385 21,968 01 Mar 2026 Direct
Lisa Ruggles CSGP Common Stock, par value $0.01 per share Tax liability -4.78% -8,931 177,892 01 Mar 2026 Direct
Frank Simuro CSGP Common Stock, par value $0.01 per share Tax liability -4.21% -18,702 425,598 01 Mar 2026 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Tax liability -4.1% -11,096 259,851 01 Mar 2026 Direct
Christian M. Lown CSGP Restricted Stock Units Award 39,652 39,652 27 Feb 2026 Direct
Frederick G. Saint CSGP Restricted Stock Units Award 39,652 39,652 27 Feb 2026 Direct
Andrew C. Florance CSGP Restricted Stock Units Award 83,708 83,708 27 Feb 2026 Direct
Gene Boxer CSGP Restricted Stock Units Award 26,888 26,888 27 Feb 2026 Direct
Michael J. Desmarais CSGP Restricted Stock Units Award 17,926 17,926 27 Feb 2026 Direct
Cynthia Cammett Cann CSGP Restricted Stock Units Award 6,834 6,834 27 Feb 2026 Direct
Lisa Ruggles CSGP Restricted Stock Units Award 28,197 28,197 27 Feb 2026 Direct
Frank Simuro CSGP Restricted Stock Units Award 52,869 52,869 27 Feb 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Purchase 3.64% $2,480,654 $44.52 55,720 1,586,866 27 Feb 2026 Direct
Frank Simuro CSGP Common Stock, par value $0.01 per share Tax liability -0.99% -4,421 444,300 19 Feb 2026 Direct
Frank Simuro CSGP Common Stock, par value $0.01 per share Disposed to Issuer -6.41% -30,727 448,721 19 Feb 2026 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Tax liability -0.79% -2,149 270,947 19 Feb 2026 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Disposed to Issuer -6.05% -17,583 273,096 19 Feb 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Tax liability -1.24% -19,221 1,531,146 19 Feb 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Disposed to Issuer -6.34% -104,983 1,550,367 19 Feb 2026 Direct
Lisa Ruggles CSGP Common Stock, par value $0.01 per share Tax liability -1.69% -3,219 186,823 19 Feb 2026 Direct
Lisa Ruggles CSGP Common Stock, par value $0.01 per share Disposed to Issuer -8.47% -17,583 190,042 19 Feb 2026 Direct
Frank Simuro CSGP Common Stock, par value $0.01 per share Tax liability -0.86% -4,151 479,448 15 Feb 2026 Direct
Andrew C. Florance CSGP Common Stock, par value $0.01 per share Tax liability -1.05% -17,482 1,655,350 15 Feb 2026 Direct
Lisa Ruggles CSGP Common Stock, par value $0.01 per share Tax liability -1.69% -3,576 207,625 15 Feb 2026 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Tax liability -0.83% -2,424 290,679 15 Feb 2026 Direct
John W. Hill CSGP Common Stock, par value $0.01 per share Sale -11% $154,530 $68.68 -2,250 18,231 13 Nov 2025 Direct
Cynthia Cammett Cann CSGP Common Stock, par value $0.01 per share Sale -7.35% $126,642 $68.79 -1,841 23,211 13 Nov 2025 Direct
Christine M. McCarthy CSGP Common Stock, par value $0.01 per share Award 2,973 2,973 09 Sep 2025 Direct
Louise S. Sams CSGP Common Stock, par value $0.01 per share Award 20.4% 3,291 19,409 09 Sep 2025 Direct
John L. Berisford CSGP Common Stock, par value $0.01 per share Award 2,973 2,973 09 Sep 2025 Direct
John W. Hill CSGP Common Stock, par value $0.01 per share Award 18.4% 3,177 20,481 09 Sep 2025 Direct
Robert W. Musslewhite CSGP Common Stock, par value $0.01 per share Award 20.6% 3,121 18,277 09 Sep 2025 Direct
Rachel C. Glaser CSGP Common Stock, par value $0.01 per share Award 3,143 3,143 09 Sep 2025 Direct
Angelique G. Brunner CSGP Common Stock, par value $0.01 per share Award 44.8% 3,143 10,166 09 Sep 2025 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Sale -7.86% $2,258,250 $90.33 -25,000 293,103 28 Aug 2025 Direct
Cynthia Cammett Cann CSGP Common Stock, par value $0.01 per share Tax liability -2.79% -719 25,052 01 Aug 2025 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Tax liability -0.45% -1,436 318,103 01 Aug 2025 Direct
Frederick G. Saint CSGP Common Stock, par value $0.01 per share Sale -7.26% $2,330,750 $93.23 -25,000 319,539 28 Jul 2025 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.