CIK 0001057352 · Large accelerated filer
COSTAR GROUP, INC.
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- CSGP
- Exchange
- Nasdaq
- Industry
- Services-Business Services, NEC
- FY end
- Dec 31
- Incorporated
- DE
- Entity type
- operating
- EIN
- 522091509
- Phone
- 2023466500
- Business address
- 1201 WILSON BLVD., ARLINGTON, VA, 22209
- Former names
- COSTAR GROUP, INC., COSTAR GROUP INC, REALTY INFORMATION GROUP INC
- Open-market buys, last 90 days
- $0
- in 0 filings
- Open-market sales, last 90 days
- $0
- in 0 filings
Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.
Reading 100 more Form 4s from the SEC; this list fills in as they're read.
| Date | Insider | Transaction | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-11-09 | Harding Catrina Chief Human Resources Officer | Grant or award · Restricted Stock Units | +12,805 | 12,805 | ||
| 2026-10-15 | Rossmann Robin Jack Chief Financial Officer | Shares withheld for taxes | −756 | $32.00 | $24K | 85,935 |
| 2026-08-07 | Cann Cynthia Cammett Chief Accounting Officer | Sale | −4,788 | $30.78 | $147K | 18,822 |
| 2026-08-05 | Hill John W Director | Sale | −3,500 | $30.21 | $106K | 22,993 |
| 2026-08-04 | FLORANCE ANDREW C Founder and CEO | Purchase | +83,300 | $29.89 | $2.5M | 1,806,165.03 |
| 2026-08-01 | SAINT FREDERICK G. President, Marketplaces | Shares withheld for taxes | −1,436 | $28.76 | $41K | 278,415 |
| 2026-08-01 | Cann Cynthia Cammett Chief Accounting Officer | Shares withheld for taxes | −1,077 | $28.76 | $31K | 23,610 |
| 2026-07-31 | Rossmann Robin Jack Chief Financial Officer | Grant or award · Restricted Stock Units | +34,771 | 34,771 | ||
| 2026-07-31 | Cann Cynthia Cammett Chief Accounting Officer | Grant or award · Restricted Stock Units | +26,078 | 26,078 | ||
| 2026-07-01 | LOWN CHRISTIAN M. Chief Financial Officer | Shares withheld for taxes | −5,597 | $29.36 | $164K | 129,653 |
| 2026-06-23 | Sams Louise S Director | Grant or award | +8,262 | 28,671 | ||
| 2026-06-23 | Brunner Angelique G. Director | Grant or award | +8,262 | 18,428 | ||
| 2026-06-23 | McCarthy Christine M Director | Grant or award | +8,262 | 11,585 | ||
| 2026-06-23 | Glaser Rachel C Director | Grant or award | +8,262 | 12,419 | ||
| 2026-06-23 | BERISFORD JOHN L Director | Grant or award | +8,262 | 11,235 | ||
| 2026-06-23 | Musslewhite Robert W Director | Grant or award | +8,262 | 26,539 | ||
| 2026-06-23 | Hill John W Director | Grant or award | +8,262 | 26,493 | ||
| 2026-06-15 | Cann Cynthia Cammett Chief Accounting Officer | Shares withheld for taxes | −461 | $32.04 | $15K | 24,687 |
| 2026-05-01 | FLORANCE ANDREW C President and CEO | Purchase | +68,330 | $35.17 | $2.4M | 1,719,765.03 |
| 2026-05-01 | FLORANCE ANDREW C President and CEO | Purchase | +3,100 | $35.82 | $111K | 1,722,865.03 |
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