CSGP
CoStar Group (CSGP)
NASDAQ
$30.76+$0.66 (+2.19%)
Price as of Nov 13, 2026 12:58 PM EST
  • $12.1B
    Market Cap
  • -56.08%
    1-Year Change
  • Real Estate Services
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
VANGUARD GROUP INC
17.43%
70.1M
+52,558 (+0.07%)
Dec 31, 2025
BLACKROCK INC.
9.58%
38.6M
-325,365 (-0.84%)
Jun 30, 2024
BLACKROCK FUNDING, INC. /DE
9.47%
38.1M
-770,199 (-2.02%)
Dec 31, 2024
N/A
9.42%
37.9M
-319,289 (-0.84%)
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
9.42%
37.9M
-319,289 (-0.84%)
Jun 30, 2026
BLACKROCK, INC.
8.40%
33.8M
+5,785 (+0.02%)
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
6.63%
26.7M
-740,111 (-2.77%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions7.7B (68.36%)
  • Mutual Funds3.5B (31.58%)
  • Insiders6.5M (0.06%)
  • Other0 (0.00%)

Insider Transactions

  • 0.06% (6.5M)
    Current InsiderOwnership (%, shares)
  • 3
    Number of InsiderBuying (last 12 months)
  • $132.4M
    Amount of InsiderBuying (last 12 months)
  • 2
    Number of InsiderSelling (last 12 months)
  • $3.6M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Harding Catrina
Chief Human Resources Officer
Award
Nov 09, 2026
$0.00
12,805
$0.00
12,805
Rossmann Robin Jack
Chief Financial Officer
In Kind
Oct 15, 2026
$24,192.00
756
$32.00
85,935
Cann Cynthia Cammett
Chief Accounting Officer
Sell
Aug 07, 2026
$147,374.64
4,788
$30.78
18,822
Hill John W
Sell
Aug 05, 2026
$105,735.00
3,500
$30.21
22,993
FLORANCE ANDREW C
Founder and CEO
Buy
Aug 04, 2026
$2.5M
83,300
$29.89
1.8M
Cann Cynthia Cammett
Chief Accounting Officer
In Kind
Aug 01, 2026
$30,974.52
1,077
$28.76
23,610
SAINT FREDERICK G.
President, Marketplaces
In Kind
Aug 01, 2026
$41,299.36
1,436
$28.76
278,415
Cann Cynthia Cammett
Chief Accounting Officer
Award
Jul 31, 2026
$0.00
26,078
$0.00
26,078
Rossmann Robin Jack
Chief Financial Officer
Award
Jul 31, 2026
$0.00
34,771
$0.00
34,771
LOWN CHRISTIAN M.
Chief Financial Officer
In Kind
Jul 01, 2026
$164,327.92
5,597
$29.36
129,653
McCarthy Christine M
Award
Jun 23, 2026
$0.00
8,262
$0.00
11,585
Sams Louise S
Award
Jun 23, 2026
$0.00
8,262
$0.00
28,671
Glaser Rachel C
Award
Jun 23, 2026
$0.00
8,262
$0.00
12,419
Hill John W
Award
Jun 23, 2026
$0.00
8,262
$0.00
26,493
Cann Cynthia Cammett
Chief Accounting Officer
In Kind
Jun 15, 2026
$14,770.44
461
$32.04
24,687
Boxer Gene
General Counsel and Secretary
In Kind
Mar 15, 2026
$18,673.64
428
$43.63
95,517
Ruggles Lisa
Senior VP, Global Operations
In Kind
Mar 15, 2026
$129,886.51
2,977
$43.63
174,915
DESMARAIS MICHAEL J
Chief Human Resources Officer
In Kind
Mar 15, 2026
$125,348.99
2,873
$43.63
87,725
SIMURO FRANK
Chief Technology Officer
In Kind
Mar 15, 2026
$484,598.41
11,107
$43.63
414,491
Cann Cynthia Cammett
Chief Accounting Officer
In Kind
Mar 15, 2026
$52,094.22
1,194
$43.63
25,148
FLORANCE ANDREW C
President and CEO
Award
Mar 10, 2026
$0.00
124,162
$0.00
1.7M
Cann Cynthia Cammett
Chief Accounting Officer
Award
Mar 10, 2026
$0.00
4,374
$0.00
26,342
DESMARAIS MICHAEL J
Chief Human Resources Officer
Award
Mar 10, 2026
$0.00
17,676
$0.00
90,598
LOWN CHRISTIAN M.
Chief Financial Officer
Award
Mar 10, 2026
$0.00
12,268
$0.00
135,250
Boxer Gene
General Counsel and Secretary
Award
Mar 10, 2026
$0.00
21,920
$0.00
95,945
Sams Louise S
Buy
Mar 06, 2026
$48,360.00
1,000
$48.36
20,409
SAINT FREDERICK G.
President, Marketplaces
Buy
Mar 02, 2026
$906,600.00
20,000
$45.33
279,851
Ruggles Lisa
Senior VP, Global Operations
In Kind
Mar 01, 2026
$398,590.53
8,931
$44.63
177,892
LOWN CHRISTIAN M.
Chief Financial Officer
In Kind
Mar 01, 2026
$320,220.25
7,175
$44.63
122,982
DESMARAIS MICHAEL J
Chief Human Resources Officer
In Kind
Mar 01, 2026
$283,534.39
6,353
$44.63
72,922