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CoStar Group

CSGP Net buying
CIK 0001057352 #134 in the set updated 17 Sep 2026
Bought (12 mo)
$8.48M
out of their own pocket, the only kind of buying there is
Sold (12 mo)
$534.28K
$0.00 on a plan · $0.00 straight out of an exercise
Sold at will
$534.28K
4 of 4 sales
Net
+$7.95M
+$7.95M against sales at will

By person

17 insiders · 11 transactions
55.5×

Andrew C. Florance holds 55.5 times base salary in stock. $55.59M of shares against $1.00M in salary for 2025.

Salary from the company's own proxy. The shares are what Andrew C. Florance last reported holding, valued at $30.78, the price Common Stock, par value $0.01 per share was last bought or sold at on the open market here, on 7 Aug 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
FLORANCE ANDREW C
Founder and CEO
$7.48M (4)
+$7.48M
1,806,165
0.4457%
$55.59M
+44.7%
SAINT FREDERICK G.
President, Marketplaces
$906.60K (1)
+$906.60K
278,415
0.0687%
$8.57M
−5.8%
Cann Cynthia Cammett
Chief Accounting Officer
$274.02K (2)
−$274.02K
18,822
0.0046%
$579.34K
−32.6%
Hill John W
Director
$260.27K (2)
−$260.27K
22,993
0.0057%
$707.72K
+13.6%
Sams Louise S
Director
$48.36K (1)
+$48.36K
28,671
0.0071%
$882.49K
+77.9%
Glaser Rachel C
Director
$44.94K (1)
+$44.94K
12,419
0.0031%
$382.26K
+88,607%
KLEIN MICHAEL R
Director
1,848,592
0.4562%
$56.90M
−7.2%
SIMURO FRANK
Chief Technology Officer
414,491
0.1023%
$12.76M
+6.1%
NASSETTA CHRISTOPHER J
Director
229,715
0.0567%
$7.07M
−0.7%
Ruggles Lisa
Senior VP, Global Operations
174,915
0.0432%
$5.38M
+1.3%
LOWN CHRISTIAN M.
Chief Financial Officer
129,653
0.0320%
$3.99M
+248.3%
Boxer Gene
General Counsel and Secretary
95,517
0.0236%
$2.94M
+120.6%
DESMARAIS MICHAEL J
Chief Human Resources Officer
87,725
0.0216%
$2.70M
+36.1%
Musslewhite Robert W
Director
26,539
0.0065%
$816.87K
+75.1%
Brunner Angelique G.
Director
18,428
0.0045%
$567.21K
+162.4%
McCarthy Christine M
Director
11,585
0.0029%
$356.59K
+3,210%
BERISFORD JOHN L
Director
11,235
0.0028%
$345.81K
Insider
Date
Role
Action
Shares
Price
Amount
Cann Cynthia Cammett
7 Aug 2026
Chief Accounting Officer
Sell
4,788
$30.78
$147.37K
Hill John W
5 Aug 2026
Director
Sell
3,500
$30.21
$105.74K
Cann Cynthia Cammett
13 Nov 2025
Chief Accounting Officer
Sell
1,841
$68.79
$126.64K
Hill John W
13 Nov 2025
Director
Sell
2,250
$68.68
$154.53K

What was left out

Form 4 filings counted 48
Amendments (4/A) skipped 1
Filings about a different issuer 0
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 0
Sales at will 4
Transactions with no price 0
Shares from compensation/vesting 610,685
History held since 13 Sep 2016