Ridloff Elena's Form 4 filing
Sionna Therapeutics, Inc. (SION) · filed Sep 18, 2026
- Accession no.
- 0001772518-26-000004
- Filed
- Sep 18, 2026, 4:59 PM ET
- Trade date
- Sep 17, 2026
- Filing delay
- 1 day
- Rule 10b5-1 plan
- Not checked
This filing lists 2 non-derivative transactions and 2 derivative transactions. It was filed 1 day after the trade.
Reporting owners
A Form 4 can have several reporting owners, such as a person and a fund they control. Trade tables show the first one.
| Owner | Relationship to the company |
|---|---|
| Ridloff ElenaCIK 0001772518 | Officer (CFO and CBO) |
Non-derivative securities (Table I)
Acquisitions and disposals of common stock and similar shares, one row per line on the filing.
| Trade date | Security | Transaction | Shares | Price | Value | Shares after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Common Stock | AGrant or awardAcquired | +47,269 | $0.00 | $0 | 85,801 | Direct | |
| Sep 17, 2026 | Common Stock | AGrant or awardAcquired | +47,268 | $0.00 | $0 | 133,069 | Direct |
Derivative securities (Table II)
Options, warrants, restricted stock units and similar. Shares are the underlying shares; price and value are for the derivative itself, and the holding after is in derivative units.
| Trade date | Security | Transaction | Underlying shares | Unit price | Value | Held after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Common Stock | AGrant or awardAcquired | +165,440 | $0.00 | $0 | 165,440 | Direct | |
| Sep 17, 2026 | Common Stock | DReturned to the companyDisposed | −165,440 | $0.00 | $0 | 0 | Direct |
Footnotes
Livermore does not store Form 4 footnotes. For price ranges, how indirect holdings are held and trading plan details, read the original on SEC EDGAR.