CoStar Group Ownership & Insider Activity

CoStar Group (CSGP) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 1.5% of shares outstanding. Institutional investors hold 79.8%. Over the past 90 days, insiders made 1 purchase worth $2.5M and 2 sales worth $253K.

Shares Outstanding

405.198M

Shares Float

402.258M

Insider Shares Owned

6.207M

Insider % Owned

1.5%

Institutional Shares Held

323.522M

Institutional % Held

79.8%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

$2.5M total

Sales (90d)

$253K total

Net Activity

Net Buying

Net Value (90d)

$2.2M

CoStar Group Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Aug 7, 2026	Cammett Cynthia Cann	CHIEF ACCOUNTING OFFICER	SELL	4.788K	$30.78	$147K
Aug 5, 2026	John Hill	DIRECTOR	SELL	3.500K	$30.21	$106K
Aug 4, 2026	ANDREW FLORANCE	FOUNDER AND CEO	BUY	83.300K	$29.89	$2.5M
May 1, 2026	ANDREW FLORANCE	PRESIDENT AND CEO	BUY	71.430K	$35.20	$2.5M
Mar 6, 2026	Louise Sams	DIRECTOR	BUY	1.000K	$48.36	$48K
Mar 2, 2026	Rachel Glaser	DIRECTOR	BUY	1.000K	$44.94	$45K
Mar 1, 2026	FREDERICK SAINT	PRESIDENT, MARKETPLACES	BUY	8.904K	$44.98	$411K
Feb 27, 2026	ANDREW FLORANCE	PRESIDENT AND CEO	BUY	55.720K	$44.52	$2.5M

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Congressional Trading Activity

Date	Member	Party	Chamber	Action	Amount
Apr 14, 2026	Gilbert Ray Cisneros	D	House	S (Partial)	$1,001 - $15,000
Mar 13, 2026	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Jan 28, 2026	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Dec 10, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Oct 15, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Sep 30, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Sep 25, 2025	Lisa McClain	R	House	S	$1,001 - $15,000
Sep 22, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Aug 13, 2025	Lisa McClain	R	House	P	$1,001 - $15,000
Jul 31, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Jul 9, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Jun 30, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Jun 27, 2025	Gilbert Ray Cisneros	D	House	P	$15,001 - $50,000
Jun 25, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
May 15, 2025	Robert Bresnahan	R	House	S	$1,001 - $15,000
May 12, 2025	Jefferson Shreve	R	House	S	$15,001 - $50,000
Feb 24, 2025	Jefferson Shreve	R	House	P	$15,001 - $50,000
Jan 21, 2025	William Keating	D	House	P	$1,001 - $15,000
Jan 15, 2025	Julie Johnson	D	House	S	$1,001 - $15,000

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