CSGPCoStar Group, Inc.

Real Estate · Real Estate ServicesNasdaqStockMkt cap $12.2B

Disclosed trades

0 in 30d · 1 in 90d

Politicians

Last trade Aug 19, 2026

Buys

$201.5K at range midpoints

Sells

$320K at range midpoints

Closing price · 365 days

Sep 24, 2025 – Sep 23, 2026

Monthly buys vs sells · 24 months

Counts of disclosed transactions

Buys
Sells (incl. partial)

Politicians who traded it

Politicians who traded CSGP
Politician	Seat	Trades	Buys	Sells	Bought (mid)	Sold (mid)	Last trade
DGilbert Ray Cisneros, Jr.	House · CA-31	15	12	3	$120.5K	$24K	Aug 19, 2026
DDaniel S. Goldman	House · NY-10	2	1	1	$32.5K	$32.5K	Apr 10, 2023
RGreg Gianforte	House · MT-00	2	0	2	$0	$183K	Oct 13, 2020
RJefferson Shreve	House · IN-06	2	1	1	$32.5K	$32.5K	May 12, 2025
DJosh Gottheimer	House · NJ-05	2	0	2	$0	$16K	Sep 25, 2020
RLisa C. McClain	House · MI-09	2	1	1	$8K	$8K	Sep 25, 2025
DJulie Johnson	House · TX-32	1	0	1	$0	$8K	Jan 15, 2025
RRobert P. Bresnahan, Jr.	House · PA-08	1	0	1	$0	$8K	May 15, 2025
DSusie Lee	House · NV-03	1	0	1	$0	$8K	Dec 22, 2020
DWilliam R. Keating	House · MA-09	1	1	0	$8K	$0	Jan 21, 2025

Recent trades

All CSGP trades

Disclosed trades
Politician	Ticker	Asset	Type	Owner	Amount	Traded	Filed	Source
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Aug 19, 2026	Sep 10, 202622d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Partial	Self	$1,001 - $15,000	Apr 14, 2026	May 8, 202624d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Mar 13, 2026	Apr 7, 202625d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jan 28, 2026	Feb 13, 202616d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Dec 10, 2025	Jan 12, 202633d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Oct 15, 2025	Nov 18, 202534d	Filing
RLisa C. McClain	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Sell	Spouse	$1,001 - $15,000	Sep 25, 2025	Oct 22, 202527d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Sep 30, 2025	Oct 10, 202510d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Sep 22, 2025	Oct 10, 202518d	Filing
RLisa C. McClain	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Spouse	$1,001 - $15,000	Aug 13, 2025	Sep 12, 202530d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jul 31, 2025	Aug 14, 202514d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jul 9, 2025	Aug 14, 202536d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jun 30, 2025	Jul 10, 202510d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$15,001 - $50,000	Jun 27, 2025	Jul 10, 202513d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jun 25, 2025	Jul 10, 202515d	Filing
RJefferson Shreve	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Sell	Self	$15,001 - $50,000	May 12, 2025	Jun 22, 202541d	Filing
RRobert P. Bresnahan, Jr.	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Sell	Self	$1,001 - $15,000	May 15, 2025	May 31, 202516d	Filing
RJefferson Shreve	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$15,001 - $50,000	Feb 24, 2025	Mar 9, 202513d	Filing
DWilliam R. Keating	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Buy	Self	$1,001 - $15,000	Jan 21, 2025	Feb 25, 202535d	Filing
DJulie Johnson	CSGP	CoStar Group, Inc. - Common Stock (CSGP)	Sell	Joint	$1,001 - $15,000	Jan 15, 2025	Feb 12, 202528d	Filing
DDaniel S. Goldman	CSGP	CoStar Group, Inc. (CSGP)	Buy	Self	$15,001 - $50,000	Apr 10, 2023	May 19, 202339d	Filing
DDaniel S. Goldman	CSGP	CoStar Group, Inc. (CSGP)	Sell	Self	$15,001 - $50,000	Mar 6, 2023	Apr 17, 202342d	Filing
DSusie Lee	CSGP	CoStar group, Inc. (CSgP)	Sell	Joint	$1,001 - $15,000	Dec 22, 2020	Jan 11, 202120d	Filing
RGreg Gianforte	CSGP	CoStar Group, Inc. (CSGP)	Partial	Joint	$1,001 - $15,000	Oct 13, 2020	Nov 9, 202027d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. (CSGP)	Partial	Self	$1,001 - $15,000	Oct 7, 2020	Nov 5, 202029d	Filing
RGreg Gianforte	CSGP	CoStar Group, Inc. (CSGP)	Partial	Joint	$100,001 - $250,000	Sep 24, 2020	Oct 19, 202025d	Filing
DJosh Gottheimer	CSGP	CoStar Group, Inc. (CSGP)	Partial	Joint	$1,001 - $15,000	Sep 25, 2020	Oct 13, 202018d	Filing
DGilbert Ray Cisneros, Jr.	CSGP	CoStar Group, Inc. (CSGP)	Partial	Self	$1,001 - $15,000	Feb 5, 2020	Mar 10, 202034d	Filing
DJosh Gottheimer	CSGP	CoStar Group, Inc. (CSGP)	Partial	Joint	$1,001 - $15,000	Jan 17, 2020	Feb 10, 202024d	Filing

Insider activity Filed

All insider filings for CSGP

Insiders

Services-Business Services, NEC

Open-market buys · 90d

$2.5M bought

Open-market sells · 90d

$253.1K sold

Net · 90d

$2.2M

$8M net over 12 months · last Aug 7, 2026

Insider transactions as filed on SEC Form 4
Date	Insider	Kind	Security	Shares	Price	Value	Post-holdings	D/I	10b5-1	Source
Aug 7, 2026filed Aug 10, 2026	Cynthia Cammett CannChief Accounting Officer	Sale	Common Stock, par value $0.01 per share	−4,788	$30.78	$147,375	18,822	D	—	4
Aug 5, 2026filed Aug 10, 2026	John W Hill	Sale	Common Stock, par value $0.01 per share	−3,500	$30.21	$105,735	22,993	D	—	4
Aug 4, 2026filed Aug 5, 2026	Andrew C FloranceFounder and CEO	Buy	Common Stock, par value $0.01 per share	83,300	$29.89	$2,489,837	1,806,165.03	D	—	4
Aug 1, 2026filed Aug 4, 2026	Cynthia Cammett CannChief Accounting Officer	Withholding	Common Stock, par value $0.01 per share	−1,077	$28.76	$30,975	23,610	D	—	4
Aug 1, 2026filed Aug 4, 2026	Frederick G. SaintPresident, Marketplaces	Withholding	Common Stock, par value $0.01 per share	−1,436	$28.76	$41,299	278,415	D	—	4
Jul 31, 2026filed Aug 4, 2026	Robin Jack RossmannChief Financial Officer	Award	Restricted Stock Unitsderiv.	34,771	$0.00	—	34,771	D	—	4
Jul 31, 2026filed Aug 4, 2026	Cynthia Cammett CannChief Accounting Officer	Award	Restricted Stock Unitsderiv.	26,078	$0.00	—	26,078	D	—	4
Jul 1, 2026filed Jul 6, 2026	Christian M. LownChief Financial Officer	Withholding	Common Stock, par value $0.01 per share	−5,597	$29.36	$164,328	129,653	D	—	4
Jun 23, 2026filed Jun 24, 2026	Rachel C Glaser	Award	Common Stock, par value $0.01 per share	8,262	$0.00	$0	12,419	D	—	4
Jun 23, 2026filed Jun 24, 2026	John L Berisford	Award	Common Stock, par value $0.01 per share	8,262	$0.00	$0	11,235	D	—	4

Shares, prices and post-transaction holdings are exactly as reported on SEC Form 4. Net figures count open-market buys minus open-market sales only (awards, exercises, withholding and gifts are excluded).

Unusual activity Estimated

Whale watch

50Insider overlapAug 19, 2026
Rep. Gilbert Ray Cisneros, Jr. bought CSGP 15 days after its CEO bought $2.5M
DGilbert Ray Cisneros, Jr.Andrew C FloranceCSGP Filing 4
Details
Politician
Gilbert Ray Cisneros, Jr.
Ticker
CSGP
Asset
CoStar Group, Inc. - Common Stock (CSGP)
Tx type
buy
Tx date
Aug 19, 2026
Filing date
Sep 10, 2026
Amount low
$1,001
Amount high
$15,000
Amount mid
$8,001
Disclosed range
$1,001 - $15,000
Reporting lag days
22
Is whale
No
Insider trade
{"insider":{"slug":"andrew-c-florance","name":"Andrew C Florance","title":"Founder and CEO","short_title":"CEO"},"company":"COSTAR GROUP, INC.","ticker":"CSGP","tx_kind":"open_market_buy","tx_date":"2026-08-04","shares":83300,"price":29.89,"value":2489837,"is_10b5_1":false}
Days between
15
Opposite side
No
66Exec buyAug 4, 2026
CSGP CEO Andrew C Florance bought $2.5M on the open market
Andrew C FloranceCSGP 4
Details
Insider
Andrew C Florance
Company
COSTAR GROUP, INC.
Ticker
CSGP
Tx kind
open_market_buy
Tx date
Aug 4, 2026
Shares
83,300
Price
$30
Value
$2.5M
Is 10b5 1
No
66Exec buyMay 1, 2026
CSGP CEO Andrew C Florance bought $2.4M on the open market
Andrew C FloranceCSGP 4
Details
Insider
Andrew C Florance
Company
COSTAR GROUP, INC.
Ticker
CSGP
Tx kind
open_market_buy
Tx date
May 1, 2026
Shares
68,330
Price
$35
Value
$2.4M
Is 10b5 1
No
46Exec buyMay 1, 2026
CSGP CEO Andrew C Florance bought $111K on the open market
Andrew C FloranceCSGP 4
Details
Insider
Andrew C Florance
Company
COSTAR GROUP, INC.
Ticker
CSGP
Tx kind
open_market_buy
Tx date
May 1, 2026
Shares
3,100
Price
$36
Value
$111K
Is 10b5 1
No
65Insider overlapApr 14, 2026
Rep. Gilbert Ray Cisneros, Jr. partially sold CSGP 17 days before its CEO bought $2.4M
DGilbert Ray Cisneros, Jr.Andrew C FloranceCSGP Filing 4
Details
Politician
Gilbert Ray Cisneros, Jr.
Ticker
CSGP
Asset
CoStar Group, Inc. - Common Stock (CSGP)
Tx type
partial_sale
Tx date
Apr 14, 2026
Filing date
May 8, 2026
Amount low
$1,001
Amount high
$15,000
Amount mid
$8,001
Disclosed range
$1,001 - $15,000
Reporting lag days
24
Is whale
No
Insider trade
{"insider":{"slug":"andrew-c-florance","name":"Andrew C Florance","title":"Founder and CEO","short_title":"CEO"},"company":"COSTAR GROUP, INC.","ticker":"CSGP","tx_kind":"open_market_buy","tx_date":"2026-05-01","shares":68330,"price":35.17,"value":2403166.1,"is_10b5_1":false}
Days between
-17
Opposite side
Yes
50Insider overlapMar 13, 2026
Rep. Gilbert Ray Cisneros, Jr. bought CSGP 11 days after its President bought $907K
DGilbert Ray Cisneros, Jr.Frederick G. SaintCSGP Filing 4
Details
Politician
Gilbert Ray Cisneros, Jr.
Ticker
CSGP
Asset
CoStar Group, Inc. - Common Stock (CSGP)
Tx type
buy
Tx date
Mar 13, 2026
Filing date
Apr 7, 2026
Amount low
$1,001
Amount high
$15,000
Amount mid
$8,001
Disclosed range
$1,001 - $15,000
Reporting lag days
25
Is whale
No
Insider trade
{"insider":{"slug":"frederick-g-saint","name":"Frederick G. Saint","title":"President, Marketplaces","short_title":"President"},"company":"COSTAR GROUP, INC.","ticker":"CSGP","tx_kind":"open_market_buy","tx_date":"2026-03-02","shares":20000,"price":45.33,"value":906600,"is_10b5_1":false}
Days between
11
Opposite side
No
59Exec buyMar 2, 2026
CSGP President Frederick G. Saint bought $907K on the open market
Frederick G. SaintCSGP 4
Details
Insider
Frederick G. Saint
Company
COSTAR GROUP, INC.
Ticker
CSGP
Tx kind
open_market_buy
Tx date
Mar 2, 2026
Shares
20,000
Price
$45
Value
$906.6K
Is 10b5 1
No
66Exec buyFeb 27, 2026
CSGP CEO Andrew C Florance bought $2.5M on the open market
Andrew C FloranceCSGP 4
Details
Insider
Andrew C Florance
Company
COSTAR GROUP, INC.
Ticker
CSGP
Tx kind
open_market_buy
Tx date
Feb 27, 2026
Shares
55,720
Price
$45
Value
$2.5M
Is 10b5 1
No
50Insider overlapJan 28, 2026
Rep. Gilbert Ray Cisneros, Jr. bought CSGP 30 days before its CEO bought $2.5M
DGilbert Ray Cisneros, Jr.Andrew C FloranceCSGP Filing 4
Details
Politician
Gilbert Ray Cisneros, Jr.
Ticker
CSGP
Asset
CoStar Group, Inc. - Common Stock (CSGP)
Tx type
buy
Tx date
Jan 28, 2026
Filing date
Feb 13, 2026
Amount low
$1,001
Amount high
$15,000
Amount mid
$8,001
Disclosed range
$1,001 - $15,000
Reporting lag days
16
Is whale
No
Insider trade
{"insider":{"slug":"andrew-c-florance","name":"Andrew C Florance","title":"Founder and CEO","short_title":"CEO"},"company":"COSTAR GROUP, INC.","ticker":"CSGP","tx_kind":"open_market_buy","tx_date":"2026-02-27","shares":55720,"price":44.52,"value":2480654.4,"is_10b5_1":false}
Days between
-30
Opposite side
No
50Insider overlapSep 25, 2025
Rep. Lisa C. McClain sold CSGP 28 days after its President sold $2.3M
RLisa C. McClainFrederick G. SaintCSGP Filing 4
Details
Politician
Lisa C. McClain
Ticker
CSGP
Asset
CoStar Group, Inc. - Common Stock (CSGP)
Tx type
sell
Tx date
Sep 25, 2025
Filing date
Oct 22, 2025
Amount low
$1,001
Amount high
$15,000
Amount mid
$8,001
Disclosed range
$1,001 - $15,000
Reporting lag days
27
Is whale
No
Insider trade
{"insider":{"slug":"frederick-g-saint","name":"Frederick G. Saint","title":"President, Marketplaces","short_title":"President"},"company":"COSTAR GROUP, INC.","ticker":"CSGP","tx_kind":"open_market_sale","tx_date":"2025-08-28","shares":25000,"price":90.33,"value":2258250,"is_10b5_1":false}
Days between
28
Opposite side
No