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United States Software & IT Services

CoStar Group Inc (CSGP)

Track

Over the last 90 days, CoStar Group Inc. has seen net insider buying totaling $2.51 million, with one executive making significant purchases. This activity occurred following a recent earnings report that exceeded expectations by 27.78%. The stock has experienced a 25.7% decline over the past 90 days, trading near the lower end of its 52-week range.
Stock chart
Ticker: CSGP Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
FLORANCE ANDREW C
President and CEO
2 purchases — total 2,514,208 USD
Buy 1 May 2026
Value US$550,164.06 | Price 226.53 | Shares 44,197
Buy 1 May 2026
Value US$561,595.67 | Price 45.33 | Shares 29,370
Buy 6 Mar 2026
Value US$3,339,121.31 | Price 387.83 | Shares 22,283
Buy 2 Mar 2026
Value US$906,600.00 | Price 45.33 | Shares 20,000
Buy 2 Mar 2026
Value US$44,940.00 | Price 44.94 | Shares 1,000
Buy 27 Feb 2026
Value US$2,480,654.40 | Price 44.52 | Shares 55,720
Sale 13 Nov 2025
Value US$126,642.39 | Price 68.79 | Shares 1,841
Sale 13 Nov 2025
Value US$154,530.00 | Price 68.68 | Shares 2,250
Proposed sale 13 Nov 2025
Value US$151,920.00 | Price 67.52 | Shares 2,250
Sale 28 Aug 2025
Value US$2,258,250.00 | Price 90.33 | Shares 25,000
Proposed sale 28 Aug 2025
Value US$2,258,225.00 | Price 90.33 | Shares 25,000
Sale 28 Jul 2025
Value US$2,330,750.00 | Price 93.23 | Shares 25,000
Sale 28 Jul 2025
Value US$188,764.05 | Price 92.85 | Shares 2,033
Proposed sale 28 Jul 2025
Value US$2,330,827.50 | Price 93.23 | Shares 25,000
Sale 11 Jun 2025
Value US$2,027,500.00 | Price 81.10 | Shares 25,000
Proposed sale 11 Jun 2025
Value US$2,027,382.50 | Price 81.10 | Shares 25,000
Proposed sale 12 May 2025
Value US$20,148,787.20 | Price 75.20 | Shares 267,936
Proposed sale 9 May 2025
Value US$2,416,663.68 | Price 75.37 | Shares 32,064
Sale 10 Mar 2025
Value US$139,745.10 | Price 79.90 | Shares 1,749
Sale 10 Dec 2024
Value US$209,938.60 | Price 76.76 | Shares 2,735
Proposed sale 10 Dec 2024
Value US$215,100.00 | Price 78.65 | Shares 2,735
Sale 27 Nov 2024
Value US$135,135.59 | Price 80.39 | Shares 1,681
Proposed sale 27 Nov 2024
Value US$134,345.52 | Price 79.92 | Shares 1,681
Planned sale 26 Nov 2024
Value US$439,340.00 | Price 79.88 | Shares 5,500
Proposed sale 26 Nov 2024
Value US$439,323.50 | Price 79.88 | Shares 5,500
Sale 11 Nov 2024
Value US$100,673.50 | Price 76.85 | Shares 1,310
Buy 25 Oct 2024
Value US$1,099,966.01 | Price 74.67 | Shares 14,731
Sale 25 Oct 2024
Value US$5,350,268.77 | Price 74.69 | Shares 71,633
Proposed sale 25 Oct 2024
Value US$5,300,000.00 | Price 73.99 | Shares 71,633
Sale 31 Jul 2024
Value US$93,840.00 | Price 78.20 | Shares 1,200
Sale 30 Jul 2024
Value US$103,562.00 | Price 78.16 | Shares 1,325
Proposed sale 30 Jul 2024
Value US$103,000.00 | Price 77.74 | Shares 1,325
Sale 16 May 2024
Value US$221,075.00 | Price 88.43 | Shares 2,500
Proposed sale 16 May 2024
Value US$221,070.25 | Price 88.43 | Shares 2,500
Sale 9 May 2024
Value US$1,823,000.00 | Price 91.15 | Shares 20,000
Sale 9 May 2024
Value US$1,823,000.00 | Price 91.15 | Shares 20,000
Proposed sale 9 May 2024
Value US$1,822,922.00 | Price 91.15 | Shares 20,000
Sale 26 Apr 2024
Value US$352,146.00 | Price 92.67 | Shares 3,800
Sale 26 Apr 2024
Value US$11,366,580.96 | Price 92.61 | Shares 122,736
Proposed sale 26 Apr 2024
Value US$11,366,912.35 | Price 92.61 | Shares 122,736
Proposed sale 26 Apr 2024
Value US$352,154.74 | Price 92.67 | Shares 3,800
Sale 28 Nov 2023
Value US$253,891.40 | Price 84.07 | Shares 3,020
Proposed sale 28 Nov 2023
Value US$250,000.00 | Price 82.78 | Shares 3,020
Sale 8 Nov 2023
Value US$116,790.00 | Price 77.86 | Shares 1,500
Proposed sale 8 Nov 2023
Value US$116,798.00 | Price 77.87 | Shares 1,500
Proposed sale 28 Jun 2023
Value US$1,922,695.74 | Price 89.30 | Shares 21,530
Sale 27 Jun 2023
Value US$8,274,695.00 | Price 89.65 | Shares 92,300
Proposed sale 27 Jun 2023
Value US$8,104,863.00 | Price 87.81 | Shares 92,300
Sale 26 Jun 2023
Value US$129,855.00 | Price 86.57 | Shares 1,500
Proposed sale 23 Jun 2023
Value US$125,932.00 | Price 83.95 | Shares 1,500
Sale 12 Jun 2023
Value US$1,990,375.60 | Price 80.68 | Shares 24,670
Proposed sale 12 Jun 2023
Value US$1,990,481.68 | Price 80.68 | Shares 24,670
Sale 7 Jun 2023
Value US$2,407,200.00 | Price 80.24 | Shares 30,000
Proposed sale 7 Jun 2023
Value US$2,407,149.00 | Price 80.24 | Shares 30,000
Sale 28 Apr 2023
Value US$27,677,888.10 | Price 76.77 | Shares 360,530
Proposed sale 28 Apr 2023
Value US$27,677,707.84 | Price 76.77 | Shares 360,530
Sale 31 Mar 2023
Value US$157,550.00 | Price 68.50 | Shares 2,300
Sale 8 Mar 2023
Value US$394,016.00 | Price 70.36 | Shares 5,600
Sale 1 Mar 2023
Value US$2,468,569.80 | Price 70.09 | Shares 35,220
Sale 3 Nov 2022
Value US$288,058.00 | Price 78.92 | Shares 3,650
Sale 28 Oct 2022
Value US$107,321.76 | Price 82.81 | Shares 1,296
Sale 10 Aug 2022
Value US$104,286.00 | Price 74.49 | Shares 1,400
Sale 5 Aug 2022
Value US$10,863,000.00 | Price 72.42 | Shares 150,000
Sale 3 Aug 2022
Value US$145,020.00 | Price 72.51 | Shares 2,000
Sale 24 May 2022
Value US$99,872.50 | Price 57.07 | Shares 1,750
Sale 2 May 2022
Value US$63,140.00 | Price 63.14 | Shares 1,000
Sale 2 Mar 2022
Value US$1,295,803.20 | Price 59.88 | Shares 21,640
Sale 11 Nov 2021
Value US$6,946.20 | Price 81.72 | Shares 85
Sale 10 Nov 2021
Value US$176,405.20 | Price 83.21 | Shares 2,120
Sale 5 Nov 2021
Value US$336,491.60 | Price 83.29 | Shares 4,040
Sale 29 Oct 2021
Value US$803,169.80 | Price 86.97 | Shares 9,235
Sale 30 Apr 2021
Value US$922,909.86 | Price 869.03 | Shares 1,062
Sale 23 Mar 2021
Value US$6,515,537.80 | Price 831.70 | Shares 7,834
Sale 16 Mar 2021
Value US$6,177,869.28 | Price 843.28 | Shares 7,326
Sale 10 Mar 2021
Value US$16,015,500.90 | Price 818.37 | Shares 19,570
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-05-04 2026-05-01 B Purchase
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
44,197 -36.0%
226.53
US$550,164 		44,197 -36.0% 226.53 US$550,164
2026-05-04 2026-05-01 B Purchase
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
29,370 +3.5%
45.33
US$561,596 		29,370 +3.5% 45.33 US$561,596
2026-03-09 2026-03-06 B Purchase
Sams Louise S
Non-Executive Director
22,283 -23.5%
387.83
US$3,339,121 		22,283 -23.5% 387.83 US$3,339,121
2026-03-03 2026-03-02 B Purchase
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
20,000 +7.7%
45.33
US$906,600 		20,000 +7.7% 45.33 US$906,600
2026-03-03 2026-03-02 B Purchase
2.4
Glaser Rachel C
Non-Executive Director
1,000 +31.7%
44.94
US$44,940 		1,000 +31.7% 44.94 US$44,940
2026-03-02 2026-02-27 B Purchase
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
55,720 +3.6%
44.52
US$2,480,654 		55,720 +3.6% 44.52 US$2,480,654
2025-11-17 2025-11-13 S Sale
3.5
Cann Cynthia Cammett

Chief Accounting Officer

Officer
1,841 -7.3%
68.79
US$126,642 		1,841 -7.3% 68.79 US$126,642
2025-11-17 2025-11-13 S Sale
3.4
Hill John W
Non-Executive Director
2,250 -11.0%
68.68
US$154,530 		2,250 -11.0% 68.68 US$154,530
2025-11-13 2025-11-13 PrS Proposed sale
3.4
Hill John W

Director; Member of immediate family of any of the foregoing

Non-Executive Director
2,250
67.52
US$151,920 		2,250 67.52 US$151,920
2025-09-02 2025-08-28 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
25,000 -7.9%
90.33
US$2,258,250 		25,000 -7.9% 90.33 US$2,258,250
2025-08-28 2025-08-28 PrS Proposed sale
2.8
FREDERICK SAINT

Officer

Officer
25,000
90.33
US$2,258,225 		25,000 90.33 US$2,258,225
2025-07-29 2025-07-28 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
25,000 -7.3%
93.23
US$2,330,750 		25,000 -7.3% 93.23 US$2,330,750
2025-07-29 2025-07-28 S Sale
3.5
Cann Cynthia Cammett

Chief Accounting Officer

Officer
2,033 -7.3%
92.85
US$188,764 		2,033 -7.3% 92.85 US$188,764
2025-07-28 2025-07-28 PrS Proposed sale
2.8
FREDERICK SAINT

Officer

Officer
25,000
93.23
US$2,330,828 		25,000 93.23 US$2,330,828
2025-06-12 2025-06-11 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
25,000 -6.8%
81.10
US$2,027,500 		25,000 -6.8% 81.10 US$2,027,500
2025-06-11 2025-06-11 PrS Proposed sale
2.8
FREDERICK SAINT

Officer; Director

Executive Director
25,000
81.10
US$2,027,382 		25,000 81.10 US$2,027,382
2025-05-12 2025-05-12 PrS Proposed sale
2.5
Michael Klein

Former Board Member, retired less than 90 days ago
267,936
75.20
US$20,148,787 		267,936 75.20 US$20,148,787
2025-05-09 2025-05-09 PrS Proposed sale
2.5
Michael Klein

Former Board Member, retired less than 90 days ago
32,064
75.37
US$2,416,664 		32,064 75.37 US$2,416,664
2025-03-14 2025-03-10 S Sale
3.5
Cann Cynthia Cammett

Chief Accounting Officer

Officer
1,749 -5.6%
79.90
US$139,745 		1,749 -5.6% 79.90 US$139,745
2024-12-12 2024-12-10 S Sale
3.4
Hill John W
Non-Executive Director
2,735 -13.5%
76.76
US$209,939 		2,735 -13.5% 76.76 US$209,939
2024-12-10 2024-12-10 PrS Proposed sale
3.4
Hill John W

Director

Non-Executive Director
2,735
78.65
US$215,100 		2,735 78.65 US$215,100
2024-12-02 2024-11-27 S Sale
3.3
NASSETTA CHRISTOPHER J
Non-Executive Director
1,681 -0.7%
80.39
US$135,136 		1,681 -0.7% 80.39 US$135,136
2024-11-27 2024-11-27 PrS Proposed sale
3.3
Christopher J Nasseta

Director

Non-Executive Director
1,681
79.92
US$134,346 		1,681 79.92 US$134,346
2024-11-27 2024-11-26 PlS Planned sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
5,500 -8.6%
79.88
US$439,340 		5,500 -8.6% 79.88 US$439,340
2024-11-26 2024-11-26 PrS Proposed sale
3.1
MICHAEL DESMARAIS

Officer

Officer
5,500
79.88
US$439,324 		5,500 79.88 US$439,324
2025-03-14 2024-11-11 S Sale
3.5
Cann Cynthia Cammett

Chief Accounting Officer

Officer
1,310 -4.7%
76.85
US$100,674 		1,310 -4.7% 76.85 US$100,674
2024-10-28 2024-10-25 B Purchase
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
14,731 +1.2%
74.67
US$1,099,966 		14,731 +1.2% 74.67 US$1,099,966
2024-10-28 2024-10-25 S Sale
2.5
KLEIN MICHAEL R
Non-Executive Director
71,633 -3.6%
74.69
US$5,350,269 		71,633 -3.6% 74.69 US$5,350,269
2024-10-25 2024-10-25 PrS Proposed sale
2.5
Michael Klein

Director

Non-Executive Director
71,633
73.99
US$5,300,000 		71,633 73.99 US$5,300,000
2025-03-14 2024-07-31 S Sale
3.5
Cann Cynthia Cammett

Chief Accounting Officer

Officer
1,200 -4.1%
78.20
US$93,840 		1,200 -4.1% 78.20 US$93,840
2024-08-01 2024-07-30 S Sale
3.4
Hill John W
Non-Executive Director
1,325 -7.4%
78.16
US$103,562 		1,325 -7.4% 78.16 US$103,562
2024-07-30 2024-07-30 PrS Proposed sale
3.4
Hill John W

Director

Non-Executive Director
1,325
77.74
US$103,000 		1,325 77.74 US$103,000
2024-05-17 2024-05-16 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
2,500 -0.9%
88.43
US$221,075 		2,500 -0.9% 88.43 US$221,075
2024-05-16 2024-05-16 PrS Proposed sale
2.8
FREDERICK SAINT

Officer

Officer
2,500
88.43
US$221,070 		2,500 88.43 US$221,070
2024-05-10 2024-05-09 S Sale
3.0
Ruggles Lisa

Senior VP, Global Operations

Officer
20,000 -10.4%
91.15
US$1,823,000 		20,000 -10.4% 91.15 US$1,823,000
2024-05-10 2024-05-09 S Sale
3.0
Ruggles Lisa

Senior VP, Global Operations

Officer
20,000 -10.4%
91.15
US$1,823,000 		20,000 -10.4% 91.15 US$1,823,000
2024-05-09 2024-05-09 PrS Proposed sale
3.0
LISA C. RUGGLES

Officer

Officer
20,000
91.15
US$1,822,922 		20,000 91.15 US$1,822,922
2024-04-30 2024-04-26 S Sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
3,800 -5.6%
92.67
US$352,146 		3,800 -5.6% 92.67 US$352,146
2024-04-30 2024-04-26 S Sale
3.2
Wheeler Scott T

Chief Financial Officer

Officer
122,736 -28.8%
92.61
US$11,366,581 		122,736 -28.8% 92.61 US$11,366,581
2024-04-26 2024-04-26 PrS Proposed sale
3.2
SCOTT WHEELER

Officer

Officer
122,736
92.61
US$11,366,912 		122,736 92.61 US$11,366,912
2024-04-26 2024-04-26 PrS Proposed sale
3.1
MICHAEL DESMARAIS

Officer

Officer
3,800
92.67
US$352,155 		3,800 92.67 US$352,155
2023-11-29 2023-11-28 S Sale
3.4
Hill John W
Non-Executive Director
3,020 -14.5%
84.07
US$253,891 		3,020 -14.5% 84.07 US$253,891
2023-11-28 2023-11-28 PrS Proposed sale
3.4
Hill John W

Director

Non-Executive Director
3,020
82.78
US$250,000 		3,020 82.78 US$250,000
2023-11-09 2023-11-08 S Sale
3.3
NASSETTA CHRISTOPHER J
Non-Executive Director
1,500 -0.5%
77.86
US$116,790 		1,500 -0.5% 77.86 US$116,790
2023-11-08 2023-11-08 PrS Proposed sale
3.3
Christopher J Nassetta

Director

Non-Executive Director
1,500
77.87
US$116,798 		1,500 77.87 US$116,798
2023-06-28 2023-06-28 PrS Proposed sale
3.2
SCOTT WHEELER

Officer

Officer
21,530
89.30
US$1,922,696 		21,530 89.30 US$1,922,696
2023-06-28 2023-06-27 S Sale
3.1
SIMURO FRANK

Chief Technology Officer

Officer
92,300 -25.9%
89.65
US$8,274,695 		92,300 -25.9% 89.65 US$8,274,695
2023-06-27 2023-06-27 PrS Proposed sale
3.1
SIMURO FRANK

Officer

Officer
92,300
87.81
US$8,104,863 		92,300 87.81 US$8,104,863
2023-06-28 2023-06-26 S Sale
3.4
Hill John W
Non-Executive Director
1,500 -8.1%
86.57
US$129,855 		1,500 -8.1% 86.57 US$129,855
2023-06-23 2023-06-23 PrS Proposed sale
3.4
Hill John W

Director

Non-Executive Director
1,500
83.95
US$125,932 		1,500 83.95 US$125,932
2023-06-14 2023-06-12 S Sale
3.2
Wheeler Scott T

Chief Financial Officer

Officer
24,670 -6.7%
80.68
US$1,990,376 		24,670 -6.7% 80.68 US$1,990,376
2023-06-12 2023-06-12 PrS Proposed sale
3.2
SCOTT WHEELER

Officer

Officer
24,670
80.68
US$1,990,482 		24,670 80.68 US$1,990,482
2023-06-09 2023-06-07 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
30,000 -11.2%
80.24
US$2,407,200 		30,000 -11.2% 80.24 US$2,407,200
2023-06-07 2023-06-07 PrS Proposed sale
2.8
FREDERICK SAINT

Officer

Officer
30,000
80.24
US$2,407,149 		30,000 80.24 US$2,407,149
2023-05-02 2023-04-28 S Sale
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
360,530 -27.0%
76.77
US$27,677,888 		360,530 -27.0% 76.77 US$27,677,888
2023-04-28 2023-04-28 PrS Proposed sale
2.8
ANDREW FLORANCE

Officer; Director

Executive Director
360,530
76.77
US$27,677,708 		360,530 76.77 US$27,677,708
2023-04-04 2023-03-31 S Sale
3.4
Hill John W
Non-Executive Director
2,300 -11.1%
68.50
US$157,550 		2,300 -11.1% 68.50 US$157,550
2023-03-09 2023-03-08 S Sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
5,600 -11.1%
70.36
US$394,016 		5,600 -11.1% 70.36 US$394,016
2023-03-03 2023-03-01 S Sale
3.1
SIMURO FRANK

Chief Technology Officer

Officer
35,220 -9.4%
70.09
US$2,468,570 		35,220 -9.4% 70.09 US$2,468,570
2022-11-04 2022-11-03 S Sale
3.4
Hill John W
Non-Executive Director
3,650 -15.0%
78.92
US$288,058 		3,650 -15.0% 78.92 US$288,058
2022-10-31 2022-10-28 S Sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
1,296 -3.4%
82.81
US$107,322 		1,296 -3.4% 82.81 US$107,322
2022-08-11 2022-08-10 S Sale
3.4
Hill John W
Non-Executive Director
1,400 -6.4%
74.49
US$104,286 		1,400 -6.4% 74.49 US$104,286
2022-08-09 2022-08-05 S Sale
2.5
KLEIN MICHAEL R
Non-Executive Director
150,000 -6.7%
72.42
US$10,863,000 		150,000 -6.7% 72.42 US$10,863,000
2022-08-05 2022-08-03 S Sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
2,000 -4.8%
72.51
US$145,020 		2,000 -4.8% 72.51 US$145,020
2022-05-26 2022-05-24 S Sale
3.4
Hill John W
Non-Executive Director
1,750 -7.4%
57.07
US$99,872 		1,750 -7.4% 57.07 US$99,872
2022-05-04 2022-05-02 S Sale
3.1
DESMARAIS MICHAEL J

Chief Human Resources Officer

Officer
1,000 -2.3%
63.14
US$63,140 		1,000 -2.3% 63.14 US$63,140
2022-03-03 2022-03-02 S Sale
3.0
Ruggles Lisa

Senior VP, Global Research

Officer
21,640 -11.8%
59.88
US$1,295,803 		21,640 -11.8% 59.88 US$1,295,803
2021-11-15 2021-11-11 S Sale
3.2
Wheeler Scott T

Chief Financial Officer

Officer
85 -11.6%
81.72
US$6,946 		85 -11.6% 81.72 US$6,946
2021-11-12 2021-11-10 S Sale
3.3
NASSETTA CHRISTOPHER J
Non-Executive Director
2,120 -0.8%
83.21
US$176,405 		2,120 -0.8% 83.21 US$176,405
2021-11-08 2021-11-05 S Sale
3.0
Kaplan Laura Cox
Non-Executive Director
4,040 -36.1%
83.29
US$336,492 		4,040 -36.1% 83.29 US$336,492
2021-11-02 2021-10-29 S Sale
3.4
Hill John W
Non-Executive Director
9,235 -27.9%
86.97
US$803,170 		9,235 -27.9% 86.97 US$803,170
2021-05-03 2021-04-30 S Sale
3.0
Kaplan Laura Cox
Non-Executive Director
1,062 -56.1%
869.03
US$922,910 		1,062 -56.1% 869.03 US$922,910
2021-03-25 2021-03-23 S Sale
2.8
SAINT FREDERICK G.

President, Marketplaces

Officer
7,834 -24.5%
831.70
US$6,515,538 		7,834 -24.5% 831.70 US$6,515,538
2021-03-17 2021-03-16 S Sale
3.2
Wheeler Scott T

Chief Financial Officer

Officer
7,326 -21.1%
843.28
US$6,177,869 		7,326 -21.1% 843.28 US$6,177,869
2021-03-11 2021-03-10 S Sale
2.8
FLORANCE ANDREW C

President and CEO

Executive Director
19,570 -20.5%
818.37
US$16,015,501 		19,570 -20.5% 818.37 US$16,015,501
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