Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Michael Cloonan 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.
- Peter A. Thompson - $55.67M of SION open-market activity in the last 12 months
- ORBIMED ADVISORS LLC - $55.67M of SION open-market activity in the last 12 months
- Bruce Booth - $22.09M of SION open-market activity in the last 12 months
- RA CAPITAL MANAGEMENT, L.P. - $21.46M of SION open-market activity in the last 12 months
- TPG GP A, LLC - $10.00M of SION open-market activity in the last 12 months
- Jennifer Fitzpatrick - $1.03M of SION 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 Cloonan?
Michael Cloonan is a corporate insider, tracked as President & CEO, Director of Sionna Therapeutics, Inc. (SION). InsiderAlpha holds 7 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Michael Cloonan last file a Form 4?
The most recent primary Form 4 on record is dated 22 October 2025, one of 7 filings going back to 2024.
Has Michael Cloonan been buying or selling stock?
Recorded transactions: 0 open-market purchases and 12 open-market sales ($6.33M) across all tracked filings.
Where can I see all of Michael Cloonan'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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