Summary
Updated Aug 31, 2026
Andrew C. Florance is Founder and CEO, Director of COSTAR GROUP, INC. (CSGP). 8 SEC Form 4 filings on record going back to 2024, most recently on 5 August 2026. Most recent open-market trade: bought $2.49M of CSGP on 5 August 2026. Lifetime open-market purchases: $8.58M. Historical track record: 1/5 stars across 4 tracked purchases.
Recent Transactions
10Every recent SEC Form 4 transaction Andrew C. Florance has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★☆☆☆☆ (1/5) |
| Total purchases tracked | 4 |
| Purchases with forward-return data | 4 |
| 30-day win rate | 25% |
| 90-day win rate | 0% |
| Avg 5-day return | +0.39% |
| Avg 30-day return | -1.39% |
| Avg 90-day return | -14.52% |
| Best 30-day return | +7.79% |
Trading Pattern
InsiderAlpha's records for Andrew C. Florance go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. The typical open-market purchase is $1.72M (5 buys totaling $8.58M). The largest single buy on record is $2.49M of CSGP in 2026. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Andrew C. Florance files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Frederick G. Saint - $907K of CSGP open-market activity in the last 12 months
- Cynthia Cammett Cann - $274K of CSGP open-market activity in the last 12 months
- John W. Hill - $260K of CSGP open-market activity in the last 12 months
- Louise S. Sams - $48K of CSGP open-market activity in the last 12 months
- Rachel C. Glaser - $45K of CSGP open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Andrew C. Florance?
Andrew C. Florance is a corporate insider, tracked as Founder and CEO, Director of COSTAR GROUP, INC. (CSGP). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Andrew C. Florance submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Andrew C. Florance been buying or selling stock?
Recorded transactions: 5 open-market purchases ($8.58M) and 0 open-market sales across all tracked filings.
How accurate is Andrew C. Florance's historical track record?
Across 4 tracked purchases, Andrew C. Florance averaged -1.4% avg 30-day return with a 25% 30-day win rate. InsiderAlpha rates the track record at 1/5 stars.
Where can I see all of Andrew C. Florance's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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