Summary
Updated Aug 30, 2026
Michael J. Desmarais is Chief Human Resources Officer of COSTAR GROUP, INC. (CSGP). 4 SEC Form 4 filings on record going back to 2024, most recently on 17 March 2026. Most recent open-market trade: sold $439K of CSGP on 27 November 2024. Lifetime open-market sales: $439K.
Recent Transactions
4Every recent SEC Form 4 transaction Michael J. Desmarais has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Michael J. Desmarais 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 J. Desmarais?
Michael J. Desmarais is a corporate insider, tracked as Chief Human Resources Officer of COSTAR GROUP, INC. (CSGP). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Michael J. Desmarais last file a Form 4?
The most recent primary Form 4 on record is dated 17 March 2026, one of 4 filings going back to 2024.
Has Michael J. Desmarais been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($439K) across all tracked filings.
Where can I see all of Michael J. Desmarais'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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