CoStar Group Inc.

Last updated September 27, 2026

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Organization details

Legal name: CoStar Group Inc.
Former names: Realty Information Group Inc
Ownership: Public
Status: Active
Sector (GICS): Industrials
SIC code: 7389 — Services-Business Services, NEC
Jurisdiction of incorporation: Delaware
Headquarters city: Arlington
Headquarters state / province: Virginia
Headquarters country: United States
Fiscal year end: December
Ticker symbol: CSGP
Primary stock exchange: Nasdaq

Identifiers

SEC CIK: 0001057352
EIN: 52-2091509
Wikidata ID: Q16988748

Board of directors

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Andrew C. Florance · Director · Founder and CEO
Since 2023
Angelique G. Brunner · Director
Since 2023
Christine M. McCarthy · Director
Since 2025
Christopher J. Nassetta · Director
Since 2023
John L. Berisford · Director
Since 2025
John W. Hill · Director
Since 2023
Laura Cox Kaplan · Director
Since 2023
Louise S. Sams · Director
Since 2023
Michael J. Glosserman · Director
Since 2023
Michael R. Klein · Director
Since 2023
Nana Banerjee · Director
Since 2026
Rachel C. Glaser · Director
Since 2025
Robert W. Musslewhite · Director
Since 2023

Chief executives

Andrew C. Florance · President and CEO

Dates unknown

Director election results

Annual meeting of June 23, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

Board connections

9 of this board's directors also sit on 12 other boards. 3 are in the same sector.

Shared director Other board Same sector

Cardinal Health Inc.
via Robert W. Musslewhite
Cushman & Wakefield Ltd.
via Angelique G. Brunner
Definitive Healthcare Corp.
via Robert W. Musslewhite
Flutter Entertainment plc
via Christine M. McCarthy
Hilton Worldwide Holdings Inc.
via Christopher J. Nassetta
JBG SMITH Properties
via Michael J. Glosserman
Loop Industries Inc.
via Louise S. Sams
Rollins Inc. Same sector
via Louise S. Sams
The New York Times Company
via Rachel C. Glaser
The Procter & Gamble Company
via Christine M. McCarthy
Tutor Perini Corporation Same sector
via Michael R. Klein
comScore Inc. Same sector
via Nana Banerjee

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Bought, last 12 months: $8,484,600; 7 purchases by 4 insiders
Sold, last 12 months: $534,282; 4 sales by 2 insiders

Date	Insider	Transaction	Shares	Price	Value
Oct 15, 2026	Rossmann Robin Jack Officer (Chief Financial Officer)	Shares withheld for tax	−756	$32.00	$24,192
Aug 7, 2026	Cann Cynthia Cammett Officer (Chief Accounting Officer)	Open-market sale	−4,788	$30.78	$147,375
Aug 5, 2026	John W. Hill Director	Open-market sale	−3,500	$30.21	$105,735
Aug 4, 2026	Andrew C. Florance Director, Officer (Founder and CEO)	Open-market purchase	+83,300	$29.89	$2,489,837
Aug 1, 2026	Cann Cynthia Cammett Officer (Chief Accounting Officer)	Shares withheld for tax	−1,077	$28.76	$30,975
Aug 1, 2026	SAINT FREDERICK G. Officer (President, Marketplaces)	Shares withheld for tax	−1,436	$28.76	$41,299
Jul 1, 2026	LOWN CHRISTIAN M. Officer (Chief Financial Officer)	Shares withheld for tax	−5,597	$29.36	$164,328
Jun 23, 2026	Rachel C. Glaser Director	Grant or award	+8,262	—	—
Jun 23, 2026	John L. Berisford Director	Grant or award	+8,262	—	—
Jun 23, 2026	John W. Hill Director	Grant or award	+8,262	—	—
Jun 23, 2026	Angelique G. Brunner Director	Grant or award	+8,262	—	—
Jun 23, 2026	Robert W. Musslewhite Director	Grant or award	+8,262	—	—
Jun 23, 2026	Louise S. Sams Director	Grant or award	+8,262	—	—
Jun 23, 2026	Christine M. McCarthy Director	Grant or award	+8,262	—	—
Jun 15, 2026	Cann Cynthia Cammett Officer (Chief Accounting Officer)	Shares withheld for tax	−461	$32.04	$14,770

Peers

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Questions about CoStar Group Inc.

Who is the CEO of CoStar Group Inc.?

Andrew C. Florance is CoStar Group Inc.'s President and CEO.

How many directors are on CoStar Group Inc.'s board?

CoStar Group Inc.'s board has 13 directors: Andrew C. Florance, Angelique G. Brunner, Christine M. McCarthy, Christopher J. Nassetta, John L. Berisford, John W. Hill, Laura Cox Kaplan, Louise S. Sams, Michael J. Glosserman, Michael R. Klein and 3 others.

Are CoStar Group Inc. insiders buying or selling shares?

Over the last 12 months, CoStar Group Inc. insiders bought $8.5 million of shares in 7 purchases and sold $534,282 of shares in 4 sales on the open market, as reported to the SEC on Forms 4 and 5.

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