NASDAQ:CSGP

Costar Group Stock Insider Trading

Real Estate > Real Estate - Services

Buy CSGP

*Your capital is at risk

$33.40

-0.260 (-0.772%)

At Close: Jun 03, 2026

CoStar Group Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -9.06. In total, the insiders bought 668.92K and sold 567.31K CSGP shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-9.06
● Buy	668.92K shares
● Sell	567.31K shares
41% Buy Activity Negligible or No Correlation
Buy Signal Low Confidence May 01, 2026 Analysis Breakdown: Weakened by a contradictory negative Insider Power Score. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Berisford John L Director	Director	2 973 Value: $262.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Hill John W Director	Director	3 177 Value: $280.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Musslewhite Robert W Director	Director	3 121 Value: $275.1K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Glaser Rachel C Director	Director	3 143 Value: $277.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Brunner Angelique G. Director	Director	3 143 Value: $277.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Brunner Angelique G. Director	Director	3 143 Value: $277.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Glaser Rachel C Director	Director	3 143 Value: $277.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Musslewhite Robert W Director	Director	3 121 Value: $275.1K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Hill John W Director	Director	3 177 Value: $280.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Berisford John L Director	Director	2 973 Value: $262.0K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Sams Louise S Director	Director	3 291 Value: $290.1K
Sep 09, 2025 Buy	Common Stock, par value $0.01 per share A-Award	Mccarthy Christine M Director	Director	2 973 Value: $262.0K
Aug 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Saint Frederick G. President, Marketplaces	CEO / President	25 000 Value: $2.26M
Aug 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Saint Frederick G. President, Marketplaces	CEO / President	25 000 Value: $2.26M
Aug 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Cann Cynthia Cammett Chief Accounting Officer	Officer	719 Value: $68.4K
Aug 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Saint Frederick G. President, Marketplaces	CEO / President	1 436 Value: $136.7K
Aug 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Saint Frederick G. President, Marketplaces	CEO / President	1 436 Value: $136.7K
Aug 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Cann Cynthia Cammett Chief Accounting Officer	Officer	719 Value: $68.4K
Jul 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Saint Frederick G. President, Marketplaces	CEO / President	25 000 Value: $2.33M
Jul 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Cann Cynthia Cammett Chief Accounting Officer	Officer	2 033 Value: $188.8K
Jul 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Cann Cynthia Cammett Chief Accounting Officer	Officer	2 033 Value: $188.8K
Jul 28, 2025 Sell	Common Stock, par value $0.01 per share S-Sale	Saint Frederick G. President, Marketplaces	CEO / President	25 000 Value: $2.33M
Jul 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Lown Christian M. Chief Financial Officer	C-Suite Officer	4 666 Value: $375.1K
Jul 01, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Lown Christian M. Chief Financial Officer	C-Suite Officer	4 666 Value: $375.1K
Jun 15, 2025 Sell	Common Stock, par value $0.01 per share F-InKind	Cann Cynthia Cammett Chief Accounting Officer	Officer	461 Value: $37.4K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT COSTAR GROUP

CoStar Group, Inc. provides information, analytics, and online marketplace services to the commercial real estate, hospitality, residential, and related professionals industries in the United States, Canada, Europe, the Asia Pacific, and Latin America. It offers CoStar Property that provides inventory of office, industrial, retail, multifamily, hospitality, and student housing properties and land; CoStar COMPS, a robust database of comparable com...

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