Insiders who reported open-market trades in the last 12 months at the companies Elena Ridloff 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 in SION purchases and sales in the last 12 months
ORBIMED ADVISORS LLC - $55.67M in SION purchases and sales in the last 12 months
Elena Ridloff is a corporate insider, tracked as CFO and CBO of Sionna Therapeutics, Inc. (SION). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Elena Ridloff submitted recently?
2 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Elena Ridloff been buying or selling stock?
Recorded transactions: 0 open-market purchases and 11 open-market sales ($3.25M) across all tracked filings.
Elena Ridloff is CFO and CBO of Sionna Therapeutics, Inc. (SION). 8 SEC Form 4 filings on record going back to 2025, most recently on 18 September 2026. Most recent open-market trade: sold $261K of KYMR on 11 May 2026. Lifetime open-market sales: $3.25M.
Recent transactions
16
The latest 16 SEC Form 4 transactions reported by Elena Ridloff.
InsiderAlpha's records for Elena Ridloff go back to 2025: 8 primary Form 4 filings, an average of 4.0 per year. 10 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.
