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 JB
 JS
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Detailed Insider History for:
COSTAR GROUP INC: CSGP
Price: 6/26/26 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
$30.25 $97.43 $28.54 $12,353 408 7,452 0.0% 4.2% 107.83% 1.22%
Exch Sector Industry Sub-Industry
NasdaqGS Services Business Services Services- Business Services, N E C
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#
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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
    
 
GLASER RACHEL C
DIR
JB
---
8,262
---
6/23/26
---
---
12,419
198.7
D
R
6/24/26 - 9:14:03 pm
2
    
 
BERISFORD JOHN L
DIR
JB
---
8,262
---
6/23/26
---
---
11,235
277.9
D
R
6/24/26 - 9:13:57 pm
3
    
 
HILL JOHN W
DIR
JB
---
8,262
---
6/23/26
---
---
26,493
45.3
D
R
6/24/26 - 9:13:51 pm
4
    
 
BRUNNER ANGELIQUE G
DIR
JB
---
8,262
---
6/23/26
---
---
18,428
81.3
D
R
6/24/26 - 9:13:45 pm
5
    
 
MUSSLEWHITE ROBERT W
DIR
JB
---
8,262
---
6/23/26
---
---
26,539
45.2
D
R
6/24/26 - 9:13:39 pm
6
    
 
SAMS LOUISE S
DIR
JB
---
8,262
---
6/23/26
---
---
28,671
40.5
D
R
6/24/26 - 9:13:33 pm
7
    
 
MCCARTHY CHRISTINE M
DIR
JB
---
8,262
---
6/23/26
---
---
11,585
248.6
D
R
6/24/26 - 9:12:42 pm
8
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$14,770
461
---
6/15/26
---
$32.04
24,687
-1.8
D
---
6/16/26 - 5:32:12 pm
9
1y
7
57%
20%
2
FLORANCE ANDREW C
PR,CEO,DIR
B
$2,514,208
71,430
---
5/1/26
$35.17
$35.82
1,722,865
4.3
D
---
5/4/26 - 6:01:03 am
10
    
 
BOXER GENE
GC,SEC
JS
$21,030
482
---
3/15/26
---
$43.63
95,463
-0.5
D
A
3/17/26 - 5:47:58 pm
11
    
 
RUGGLES LISA
VP,OO
JS
$129,887
2,977
---
3/15/26
---
$43.63
174,915
-1.7
D
---
3/17/26 - 4:12:44 pm
12
    
 
BOXER GENE
GC,SEC
JS
$18,674
428
---
3/15/26
---
$43.63
95,517
-0.4
D
---
3/17/26 - 4:12:38 pm
13
    
 
SIMURO FRANK
CTO
JS
$484,598
11,107
---
3/15/26
---
$43.63
414,491
-2.6
D
---
3/17/26 - 4:12:32 pm
14
    
 
BANERJEE NANA
DIR
3
---
---
---
3/15/26
---
---
---
---
---
---
3/17/26 - 4:12:22 pm
15
    
 
DESMARAIS MICHAEL J
HR
JS
$125,349
2,873
---
3/15/26
---
$43.63
87,725
-3.2
D
---
3/17/26 - 4:12:16 pm
16
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$52,094
1,194
---
3/15/26
---
$43.63
25,148
-4.5
D
---
3/17/26 - 4:12:10 pm
17
    
 
CANN CYNTHIA CAMMETT
CAO
JB
---
4,374
---
3/10/26
---
---
26,342
19.9
D
R
3/11/26 - 5:18:22 pm
18
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JB
---
124,162
---
3/10/26
---
---
1,651,435
8.1
D
R
3/11/26 - 5:18:16 pm
19
    
 
LOWN CHRISTIAN M
CFO
JB
---
12,268
---
3/10/26
---
---
135,250
10.0
D
R
3/11/26 - 5:18:11 pm
20
    
 
BOXER GENE
GC,SEC
JB
---
21,920
---
3/10/26
---
---
95,945
29.6
D
R
3/11/26 - 5:18:05 pm
21
    
 
DESMARAIS MICHAEL J
HR
JB
---
17,676
---
3/10/26
---
---
90,598
24.2
D
R
3/11/26 - 5:17:59 pm
22
    
 
SAMS LOUISE S
DIR
B
$48,360
1,000
---
3/6/26
---
$48.36
20,409
5.2
D
---
3/9/26 - 8:00:08 am
23
3m
1
0%
-28%
5
GLASER RACHEL C
DIR
B
$44,940
1,000
---
3/2/26
---
$44.94
4,157
31.7
D
---
3/3/26 - 4:09:37 pm
24
3m
1
0%
-28%
2
SAINT FREDERICK G
PR
B
$906,600
20,000
---
3/2/26
---
$45.33
279,851
7.7
D
---
3/3/26 - 4:09:07 pm
25
    
 
LOWN CHRISTIAN M
CFO
JS
$320,220
7,175
---
3/1/26
---
$44.63
122,982
-5.5
D
R
3/3/26 - 7:06:40 pm
26
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$2,659,636
59,593
---
3/1/26
---
$44.63
1,527,273
-3.8
D
R
3/3/26 - 7:06:29 pm
27
    
 
BOXER GENE
GC,SEC
JS
$202,933
4,547
---
3/1/26
---
$44.63
74,025
-5.8
D
R
3/3/26 - 7:06:23 pm
28
    
 
DESMARAIS MICHAEL J
HR
JS
$283,534
6,353
---
3/1/26
---
$44.63
72,922
-8.0
D
R
3/3/26 - 7:06:17 pm
29
    
 
CANN CYNTHIA CAMMETT
CAO
JS
$61,813
1,385
---
3/1/26
---
$44.63
21,968
-5.9
D
R
3/3/26 - 7:06:11 pm
30
    
 
RUGGLES LISA
VP,OO
JS
$398,591
8,931
---
3/1/26
---
$44.63
177,892
-4.8
D
R
3/3/26 - 7:06:04 pm
31
    
 
SIMURO FRANK
CTO
JS
$834,670
18,702
---
3/1/26
---
$44.63
425,598
-4.2
D
R
3/3/26 - 7:05:56 pm
32
    
 
SAINT FREDERICK G
PR
JS
$495,214
11,096
---
3/1/26
---
$44.63
259,851
-4.1
D
---
3/3/26 - 4:09:07 pm
33
1y
7
57%
20%
2
FLORANCE ANDREW C
PR,CEO,DIR
B
$2,480,655
55,720
---
2/27/26
---
$44.52
1,586,866
3.6
D
---
3/2/26 - 4:00:49 pm
34
    
 
SIMURO FRANK
CTO
JS
$216,938
35,148
---
2/19/26
---
$49.07
444,300
-7.3
D
R
2/23/26 - 5:18:12 pm
35
    
 
SAINT FREDERICK G
PR
JS
$105,451
19,732
---
2/19/26
---
$49.07
270,947
-6.8
D
R
2/23/26 - 5:18:06 pm
36
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$943,175
124,204
---
2/19/26
---
$49.07
1,531,146
-7.5
D
R
2/23/26 - 5:18:00 pm
37
    
 
RUGGLES LISA
VP,OO
JS
$157,956
20,802
---
2/19/26
---
$49.07
186,823
-10.0
D
R
2/23/26 - 5:17:55 pm
38
    
 
SIMURO FRANK
CTO
JS
$186,753
4,151
---
2/15/26
---
$44.99
479,448
-0.9
D
---
2/18/26 - 4:05:54 pm
39
    
 
FLORANCE ANDREW C
PR,CEO,DIR
JS
$786,515
17,482
---
2/15/26
---
$44.99
1,655,350
-1.0
D
---
2/18/26 - 4:05:47 pm
40
    
 
RUGGLES LISA
VP,OO
JS
$160,884
3,576
---
2/15/26
---
$44.99
207,625
-1.7
D
---
2/18/26 - 4:05:39 pm
41
    
 
SAINT FREDERICK G
PR
JS
$109,056
2,424
---
2/15/26
---
$44.99
290,679
-0.8
D
---
2/18/26 - 4:05:27 pm
42
1y
14
43%
18%
2
HILL JOHN W
DIR
S
$154,530
2,250
---
11/13/25
---
$68.68
18,231
-11.0
D
---
11/17/25 - 4:03:25 pm
43
    
 
CANN CYNTHIA CAMMETT
CAO
S
$126,642
1,841
---
11/13/25
---
$68.79
23,211
-7.3
D
---
11/17/25 - 4:03:18 pm
44
    
 
MCCARTHY CHRISTINE M
DIR
JB
---
2,973
---
9/9/25
---
---
2,973
New
D
---
9/11/25 - 5:43:29 pm
45
    
 
SAMS LOUISE S
DIR
JB
---
3,291
---
9/9/25
---
---
19,409
20.4
D
---
9/11/25 - 5:42:36 pm
46
    
 
BERISFORD JOHN L
DIR
JB
---
2,973
---
9/9/25
---
---
2,973
New
D
---
9/11/25 - 5:42:13 pm
47
    
 
HILL JOHN W
DIR
JB
---
3,177
---
9/9/25
---
---
20,481
18.4
D
---
9/11/25 - 5:41:50 pm
48
    
 
MUSSLEWHITE ROBERT W
DIR
JB
---
3,121
---
9/9/25
---
---
18,277
20.6
D
---
9/11/25 - 5:41:27 pm
49
    
 
GLASER RACHEL C
DIR
JB
---
3,143
---
9/9/25
---
---
3,143
New
D
---
9/11/25 - 5:41:05 pm
50
    
 
BRUNNER ANGELIQUE G
DIR
JB
---
3,143
---
9/9/25
---
---
10,166
44.8
D
---
9/11/25 - 5:40:45 pm
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