CoStar Group Inc.
Last updated September 27, 2026
Organization details
- Legal name
- CoStar Group Inc.
- Former names
- Realty Information Group Inc
- Ownership
- Public
- Status
- Active
- 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
Board of directors
-
Andrew C. Florance · Director · Founder and CEOSince 2023
-
Angelique G. Brunner · DirectorSince 2023
-
Christine M. McCarthy · DirectorSince 2025
-
Christopher J. Nassetta · DirectorSince 2023
-
John L. Berisford · DirectorSince 2025
-
John W. Hill · DirectorSince 2023
-
Laura Cox Kaplan · DirectorSince 2023
-
Louise S. Sams · DirectorSince 2023
-
Michael J. Glosserman · DirectorSince 2023
-
Michael R. Klein · DirectorSince 2023
-
Nana Banerjee · DirectorSince 2026
-
Rachel C. Glaser · DirectorSince 2025
-
Robert W. Musslewhite · DirectorSince 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.
-
93.9%
-
94.8%
-
98.1%
-
98.2%
-
98.2%
-
99.3%
-
99.5%
-
99.5%
Board connections
9 of this board's directors also sit on 12 other boards.
- via Robert W. Musslewhite
- via Angelique G. Brunner
- via Robert W. Musslewhite
- via Christine M. McCarthy
- via Christopher J. Nassetta
- via Michael J. Glosserman
- via Louise S. Sams
- via Louise S. Sams
- via Rachel C. Glaser
- via Christine M. McCarthy
- via Michael R. Klein
- 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 |
|---|---|---|---|---|---|
| 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 |
| May 1, 2026 | Andrew C. Florance Director, Officer (President and CEO) | Open-market purchase | +68,330 | $35.17 | $2,403,166 |
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