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 JS
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Detailed Insider History for:
COSTAR GROUP INC: CSGP
Price: 10/24/25 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$77.89 $97.43 $68.41 $32,998 424 2,777 0.0% 4.4% 105.40% 1.18%
Exch Sector Industry Sub-Industry
NasdaqGS Services Business Services Services- Business Services, N E C
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
    
 
MCCARTHY CHRISTINE M
DIR
JB
---
2,973
---
9/9/25
---
---
2,973
New
D
---
9/11/25 - 5:43:29 pm
2
    
 
SAMS LOUISE S
DIR
JB
---
3,291
---
9/9/25
---
---
19,409
20.4
D
---
9/11/25 - 5:42:36 pm
3
    
 
BERISFORD JOHN L
DIR
JB
---
2,973
---
9/9/25
---
---
2,973
New
D
---
9/11/25 - 5:42:13 pm
4
    
 
HILL JOHN W
DIR
JB
---
3,177
---
9/9/25
---
---
20,481
18.4
D
---
9/11/25 - 5:41:50 pm
5
    
 
MUSSLEWHITE ROBERT W
DIR
JB
---
3,121
---
9/9/25
---
---
18,277
20.6
D
---
9/11/25 - 5:41:27 pm
6
    
 
GLASER RACHEL C
DIR
JB
---
3,143
---
9/9/25
---
---
3,143
New
D
---
9/11/25 - 5:41:05 pm
7
    
 
BRUNNER ANGELIQUE G
DIR
JB
---
3,143
---
9/9/25
---
---
10,166
44.8
D
---
9/11/25 - 5:40:45 pm
8
1y
3
100%
-11%
2
SAINT FREDERICK G
PR
S
$2,258,250
25,000
---
8/28/25
---
$90.33
293,103
-7.9
D
---
9/2/25 - 6:18:14 pm
9
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$68,442
719
---
8/1/25
---
$95.19
25,052
-2.8
D
---
8/5/25 - 4:23:07 pm
10
    
 
SAINT FREDERICK G
PR
JS
$136,693
1,436
---
8/1/25
---
$95.19
318,103
-0.4
D
---
8/5/25 - 4:21:33 pm
11
1y
3
100%
-11%
2
SAINT FREDERICK G
PR
S
$2,330,750
25,000
---
7/28/25
---
$93.23
319,539
-7.3
D
---
7/29/25 - 4:24:33 pm
12
    
 
CANN CYNTHIA CAMMETT
CAO
S
$188,764
2,033
---
7/28/25
---
$92.85
25,771
-7.3
D
---
7/29/25 - 4:21:51 pm
13
    
 
LOWN CHRISTIAN M
CFO
JS
$375,146
4,666
---
7/1/25
---
$80.40
130,157
-3.5
D
---
7/2/25 - 5:20:38 pm
14
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$37,415
461
---
6/15/25
---
$81.16
27,804
-1.6
D
---
6/17/25 - 6:08:45 pm
15
1y
3
100%
-11%
2
SAINT FREDERICK G
PR
S
$2,027,500
25,000
---
6/11/25
---
$81.10
344,539
-6.8
D
---
6/12/25 - 4:36:34 pm
16
    
 
RUGGLES LISA
VP,OO
JS
$883
12
---
6/1/25
---
$73.56
211,201
-0.0
D
---
6/3/25 - 4:30:31 pm
17
    
 
BERISFORD JOHN L
DIR
3
---
---
---
4/6/25
---
---
---
---
---
---
4/14/25 - 4:15:07 pm
18
    
 
GLASER RACHEL C
DIR
3
---
---
---
4/6/25
---
---
---
---
---
---
4/14/25 - 4:15:06 pm
19
    
 
MCCARTHY CHRISTINE M
DIR
3
---
---
---
4/6/25
---
---
---
---
---
---
4/14/25 - 4:15:04 pm
20
    
 
RUGGLES LISA
VP,OO
JS
$154,153
1,958
---
3/15/25
---
$78.73
211,213
-0.9
D
---
3/18/25 - 8:34:28 pm
21
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$93,767
1,191
---
3/15/25
---
$78.73
28,265
-4.0
D
---
3/18/25 - 8:34:18 pm
22
    
 
BOXER GENE
GC,SEC
JS
$37,869
481
---
3/15/25
---
$78.73
78,572
-0.6
D
---
3/18/25 - 8:34:08 pm
23
    
 
DESMARAIS MICHAEL J
HR
JS
$286,656
3,641
---
3/15/25
---
$78.73
79,118
-4.4
D
---
3/18/25 - 8:33:58 pm
24
    
 
SIMURO FRANK
CTO
JS
$448,761
5,700
---
3/15/25
---
$78.73
483,599
-1.2
D
---
3/18/25 - 8:33:47 pm
25
    
 
CANN CYNTHIA CAMMETT
CAO
S
$139,745
1,749
---
3/10/25
---
$79.90
29,456
-5.6
D
---
3/14/25 - 4:47:56 pm
26
    
 
CANN CYNTHIA CAMMETT
CAO
JB
---
1,498
---
3/5/25
---
---
33,715
4.6
D
R
3/7/25 - 6:06:41 pm
27
    
 
BOXER GENE
GC,SEC
JB
---
12,492
---
3/5/25
---
---
79,053
18.8
D
R
3/7/25 - 6:06:31 pm
28
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JB
---
76,232
---
3/5/25
---
---
1,672,832
4.8
D
R
3/7/25 - 6:06:21 pm
29
    
 
DESMARAIS MICHAEL J
HR
JB
---
9,026
---
3/5/25
---
---
82,759
12.2
D
R
3/7/25 - 6:06:11 pm
30
    
 
RUGGLES LISA
VP,OO
JS
$565,013
7,410
---
3/1/25
---
$76.25
213,171
-3.4
D
---
3/3/25 - 7:11:04 pm
31
    
 
DESMARAIS MICHAEL J
HR
JS
$296,841
3,893
---
3/1/25
---
$76.25
73,733
-5.0
D
---
3/3/25 - 7:10:51 pm
32
    
 
SAINT FREDERICK G
PR
JS
$629,215
8,252
---
3/1/25
---
$76.25
369,539
-2.2
D
---
3/3/25 - 7:10:41 pm
33
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$61,991
813
---
3/1/25
---
$76.25
32,217
-2.5
D
---
3/3/25 - 7:10:31 pm
34
    
 
BOXER GENE
GC,SEC
JS
$277,855
3,644
---
3/1/25
---
$76.25
66,561
-5.2
D
---
3/3/25 - 7:10:21 pm
35
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$3,148,820
41,296
---
3/1/25
---
$76.25
1,596,600
-2.5
D
---
3/3/25 - 7:10:11 pm
36
    
 
SIMURO FRANK
CTO
JS
$947,940
12,432
---
3/1/25
---
$76.25
489,299
-2.5
D
---
3/3/25 - 7:10:01 pm
37
    
 
DESMARAIS MICHAEL J
HR
JB
---
18,828
---
2/27/25
---
---
77,626
32.0
D
---
3/3/25 - 7:10:51 pm
38
    
 
CANN CYNTHIA CAMMETT
CAO
JB
---
4,035
---
2/27/25
---
---
33,030
13.9
D
---
3/3/25 - 7:10:31 pm
39
    
 
BOXER GENE
GC,SEC
JB
---
26,897
---
2/27/25
---
---
70,205
62.1
D
---
3/3/25 - 7:10:21 pm
40
    
 
LOWN CHRISTIAN M
CFO
JB
---
97,600
---
2/20/25
---
---
134,823
262.2
D
R
2/24/25 - 6:48:59 pm
41
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JB
---
451,440
---
2/20/25
---
---
1,637,896
38.0
D
R
2/24/25 - 6:48:48 pm
42
    
 
RUGGLES LISA
VP,OO
JB
---
65,440
---
2/20/25
---
---
220,581
42.2
D
R
2/24/25 - 6:48:39 pm
43
    
 
SIMURO FRANK
CTO
JB
---
130,640
---
2/20/25
---
---
501,731
35.2
D
R
2/24/25 - 6:48:28 pm
44
    
 
SAINT FREDERICK G
PR
JB
---
97,600
---
2/20/25
---
---
377,791
34.8
D
R
2/24/25 - 6:48:18 pm
45
    
 
SIMURO FRANK
CTO
JS
$406,219
5,485
---
2/15/25
---
$74.06
385,019
-1.4
D
---
2/19/25 - 4:57:12 pm
46
    
 
RUGGLES LISA
VP,OO
JS
$261,506
3,531
---
2/15/25
---
$74.06
169,074
-2.0
D
---
2/19/25 - 4:57:02 pm
47
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$1,054,244
14,235
---
2/15/25
---
$74.06
1,248,863
-1.1
D
---
2/19/25 - 4:56:50 pm
48
    
 
SAINT FREDERICK G
PR
JS
$173,967
2,349
---
2/15/25
---
$74.06
293,245
-0.8
D
---
2/19/25 - 4:56:40 pm
49
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$2,455,351
62,407
---
2/13/25
---
$73.27
1,186,456
-5.0
D
R
2/24/25 - 6:48:48 pm
50
    
 
RUGGLES LISA
VP,OO
JS
$548,133
13,933
---
2/13/25
---
$73.27
155,141
-8.2
D
R
2/24/25 - 6:48:39 pm
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