# Sionna Therapeutics, Inc.: Form SCHEDULE 13D/A, filed Sep 21, 2026

- Company: [Sionna Therapeutics, Inc.](/companies/sion.md) (CIK 2036042)
- Form: SCHEDULE 13D/A
- Filed: 2026-09-21
- Accepted by EDGAR: Sep 21, 2026, 18:57 ET
- Period: not reported
- Accession: 0001346824-26-000239
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/2036042/000134682426000239/xslSCHEDULE_13D_X02/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/2036042/000134682426000239/

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/2036042/000134682426000239/xslSCHEDULE_13D_X02/primary_doc.xml

Filed Sep 21, 2026.
Source: SEC EDGAR, the filing index for accession 0001346824-26-000239. Last ingested by Listed: Oct 24, 2026, 15:06 ET. No prices; not investment advice.