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.
ORBIMED ADVISORS LLC - $55.67M in SION purchases and sales in the last 12 months
Peter A. Thompson - $55.67M in SION purchases and sales in the last 12 months
Michael Cloonan is a corporate insider, tracked as President & CEO, Director of Sionna Therapeutics, Inc. (SION). 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 Michael Cloonan submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
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.
Michael Cloonan is President & CEO, Director of Sionna Therapeutics, Inc. (SION). 8 SEC Form 4 filings on record going back to 2024, most recently on 18 September 2026. Most recent open-market trade: sold $1.25M of SION on 22 October 2025. Lifetime open-market sales: $6.33M.
Recent transactions
20
The latest 20 SEC Form 4 transactions reported by Michael Cloonan.
InsiderAlpha's records for Michael Cloonan go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. 21 recorded transactions carry a Rule 10b5-1 plan flag. This identifies the marked transactions as reported under a trading plan; it does not establish the plan status of unmarked transactions.
