Summary
Updated Aug 31, 2026
Michael R. Klein is Director of COSTAR GROUP, INC. (CSGP). 2 SEC Form 4 filings on record, most recently on 12 December 2024. Most recent open-market trade: sold $5.35M of CSGP on 28 October 2024. Lifetime open-market sales: $5.35M.
Recent Transactions
3Every recent SEC Form 4 transaction Michael R. Klein has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Michael R. Klein go back to 2024: 2 primary Form 4 filings, an average of 0.7 per year. 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 Michael R. Klein 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.
- Andrew C. Florance - $7.48M of CSGP open-market activity in the last 12 months
- 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 Michael R. Klein?
Michael R. Klein is a corporate insider, tracked as Director of COSTAR GROUP, INC. (CSGP). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Michael R. Klein last file a Form 4?
The most recent primary Form 4 on record is dated 12 December 2024, one of 2 filings going back to 2024.
Has Michael R. Klein been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($5.35M) across all tracked filings.
Where can I see all of Michael R. Klein'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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