Summary
Updated Aug 30, 2026
Harold Edward Fleming is Director of Sionna Therapeutics, Inc. (SION). 4 SEC Form 4 filings on record going back to 2024, most recently on 18 June 2026.
Trading Pattern
InsiderAlpha's records for Harold Edward Fleming go back to 2024: 4 primary Form 4 filings, an average of 1.3 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 Harold Edward Fleming 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
- Samarth Kulkarni - $10.76M of CRSP open-market activity in the last 12 months
- TPG GP A, LLC - $10.00M 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 Harold Edward Fleming?
Harold Edward Fleming is a corporate insider, tracked as Director of Sionna Therapeutics, Inc. (SION). InsiderAlpha holds 4 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 Harold Edward Fleming submitted recently?
3 primary Form 4 filings in the last 90 days, covering 3 companies.
Where can I see all of Harold Edward Fleming'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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