Summary
Updated Aug 30, 2026
Marcella K. Ruddy is Director of Sionna Therapeutics, Inc. (SION). 9 SEC Form 4 filings on record going back to 2024, most recently on 18 June 2026. Most recent open-market trade: sold $32K of TECX on 6 May 2026. Lifetime open-market sales: $363K.
Recent Transactions
6Every recent SEC Form 4 transaction Marcella K. Ruddy 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 Marcella K. Ruddy 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
- Michael Cloonan - $5.13M 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 Marcella K. Ruddy?
Marcella K. Ruddy is a corporate insider, tracked as Director of Sionna Therapeutics, Inc. (SION). InsiderAlpha holds 9 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 Marcella K. Ruddy submitted recently?
2 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Marcella K. Ruddy been buying or selling stock?
Recorded transactions: 0 open-market purchases and 3 open-market sales ($363K) across all tracked filings.
Where can I see all of Marcella K. Ruddy'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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