Who
Andrew C. Florance
Founder and CEO
Company insider
Files Form 4 as: Founder and CEO, CoStar Group; Director, Walker & Dunlop.
In numbers
- Trades disclosed
- 278
- Buys
- 5
- Sells
- 38
- Bought
- $16.3M
- Sold
- $264.2M
- Companies
- 2
- Companies where not an officer
- 1
- First trade
- 10 Mar 2006
- Last trade
- 4 Aug 2026
- Last filed
- 5 Aug 2026
Companies traded
Activity over time
1 Nov 2024 – 1 Oct 2026
Buys above the line, sells below, each month.
Every trade
| Traded | Company | What | Amount | |
|---|---|---|---|---|
| 4 Aug 2026filed 5 Aug 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.5M83,300 at $29.89 | filing |
| 4 Aug 2026filed 5 Aug 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.5M83,300 at $29.89 | filing |
| 1 May 2026filed 4 May 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.4M68,330 at $35.17 | filing |
| 1 May 2026filed 4 May 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $111K3,100 at $35.82 | filing |
| 1 May 2026filed 4 May 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.4M68,330 at $35.17 | filing |
| 1 May 2026filed 4 May 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $111K3,100 at $35.82 | filing |
| 10 Mar 2026filed 11 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code A | —124,162 | filing |
| 10 Mar 2026filed 11 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code A | —124,162 | filing |
| 1 Mar 2026filed 3 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $2.7M59,593 at $44.63 | filing |
| 1 Mar 2026filed 3 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $2.7M59,593 at $44.63 | filing |
| 27 Feb 2026filed 3 Mar 2026 | CSGP CoStar Groupoption or derivative · Business Services | SEC FORM 4 Code A | —83,708 at $0.00 | filing |
| 27 Feb 2026filed 3 Mar 2026 | CSGP CoStar Groupoption or derivative · Business Services | SEC FORM 4 Code A | —83,708 at $0.00 | filing |
| 27 Feb 2026filed 2 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.5M55,720 at $44.52 | filing |
| 27 Feb 2026filed 2 Mar 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Bought | $2.5M55,720 at $44.52 | filing |
| 19 Feb 2026filed 23 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code D | —104,983 at $0.00 | filing |
| 19 Feb 2026filed 23 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $943K19,221 at $49.07 | filing |
| 19 Feb 2026filed 23 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code D | —104,983 at $0.00 | filing |
| 19 Feb 2026filed 23 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $943K19,221 at $49.07 | filing |
| 15 Feb 2026filed 18 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $787K17,482 at $44.99 | filing |
| 15 Feb 2026filed 18 Feb 2026 | CSGP CoStar GroupBusiness Services | SEC FORM 4 Code F | $787K17,482 at $44.99 | filing |
News
CoStar (CSGP): Is the Homes.com Gamble Destroying a Great Business, or Hiding One?CSGP · insidermonkey.com · 7 Oct 2026
0 headlines in the last 90 days name Andrew C. Florance; 1 article from the last 14 days about the 1 company they traded most, at most three about any one of them.