COSTAR GROUP INC. (CSGP) - Insider Holders & Insider Ownership

List of insiders holdings for COSTAR GROUP INC.:
  1. Shares directly owned by the insider.
  2. Shares indirectly owned by the insider.
  3. Total shares owned by the insider (sum of shares directly and indirectly owned).
  4. Total market value if available.
  5. Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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#Insider Holder NameReport
Date Time		Shares Owned
Directly
Indirectly		Total
Shares Owned		Filing
1KLEIN MICHAEL R
Director		2024-12-12 16:16:171,848,592
0		1,848,592Form 4
2FLORANCE ANDREW C
President and CEO		2026-03-11 17:18:161,651,435
0		1,651,435Form 4
3SIMURO FRANK
Chief Technology Officer		2026-03-17 16:12:32414,491
0		414,491Form 4
4Wheeler Scott T
Chief Financial Officer		2024-04-30 16:13:35328,651
5,701		334,352Form 4
5BONDERMAN DAVID
Director		2014-09-15 17:41:07294,277
0		294,277Form 4
6NASSETTA CHRISTOPHER J
Director		2024-12-02 16:55:38229,715
46,000		275,715Form 4
7Ruggles Lisa
Senior VP, Global Operations		2026-03-17 16:12:44174,915
0		174,915Form 4
8LOWN CHRISTIAN M.
Chief Financial Officer		2026-03-11 17:18:11135,250
0		135,250Form 4
9HABER WARREN H
Director		2018-09-24 16:28:08121,049
0		121,049Form 4
10Glosserman Michael J
Director		2023-11-01 16:13:10101,465
0		101,465Form 4
11Boxer Gene
General Counsel and Secretary		2026-03-17 17:47:5895,463
0		95,463Form 4/A
12ARABE MICHAEL D
Sen. VP- Sales & Cust. Service		2004-03-02 19:00:3889,912
1,500		91,412Form 4
13DESMARAIS MICHAEL J
Chief Human Resources Officer		2026-03-17 16:12:1687,725
0		87,725Form 4
14Radecki Brian J
Chief Financial Officer		2015-03-13 17:07:5445,973
0		45,973Form 4
15SAINT FREDERICK G.
President, Marketplaces		2026-03-03 19:06:3539,652
0		39,652Form 4
16SCHAFFEL DAVID M
Chief Information Officer		2005-03-14 17:09:5928,635
0		28,635Form 4
17Marples Paul
Managing Director, CoStar UK
Director		2012-08-01 17:35:2428,632
0		28,632Form 4
18Cann Cynthia Cammett
Chief Accounting Officer		2026-03-17 16:12:1025,148
0		25,148Form 4
19Kitchen Jennifer
Sr. Vice President, Research		2013-09-11 16:55:4022,220
0		22,220Form 4
20LOW JOSIAH O III
Director		2010-09-07 16:45:4320,705
0		20,705Form 4
21Sams Louise S
Director		2026-03-09 08:00:0820,409
0		20,409Form 4
22Stanfill John L
Sr. VP-Sales, Customer Service		2014-03-12 17:50:0620,105
0		20,105Form 4
23Linnington Matthew
Executive VP, Sales		2020-08-13 16:31:3119,766
0		19,766Form 4
24Musslewhite Robert W
Director		2025-09-11 17:41:2718,277
0		18,277Form 4
25Hill John W
Director		2025-11-17 16:03:2518,231
0		18,231Form 4
26Kaplan Laura Cox
Director		2024-08-05 16:13:3017,835
0		17,835Form 4
27Tully Christopher
Sr. VP-Sales, Customer Service		2008-05-29 11:30:4610,682
0		10,682Form 4
28Brunner Angelique G.
Director		2025-09-11 17:40:4510,166
0		10,166Form 4
29CARCHEDI FRANCIS
Executive VP, Corp. Dev.		2018-10-02 16:17:566,540
0		6,540Form 4
30Steinberg David Jay
Director		2020-03-05 16:46:366,456
0		6,456Form 4
31FARRINGTON CRAIG
Vice President, Research		2007-05-01 16:27:066,307
0		6,307Form 4
32Reynolds Catherine B
Director		2007-09-18 16:16:445,736
0		5,736Form 4
33Yinger Scott L
Interim CFO		2015-08-11 17:23:234,583
0		4,583Form 3
34Glaser Rachel C
Director		2026-03-03 16:09:374,157
0		4,157Form 4
35McCarthy Christine M
Director		2025-09-11 17:43:292,973
0		2,973Form 4
36BERISFORD JOHN L
Director		2025-09-11 17:42:132,973
0		2,973Form 4
37Banerjee Nana
Director		2026-03-17 16:12:220
0		0Form 3