Layoffs at Sionna Therapeutics
- Layoff events
- 1
- verified and sourced
- Roles reported
- Not stated
- the source gives no number
- Announced
- 14 Sep 2026
- Reported by
- U.S. Securities and Exchange Commission, Sionna Therapeutics, and Fierce Biotech
This page records what we could verify and source. It is not a complete record of every job cut at Sionna Therapeutics: a layoff nobody published and nobody sent us is a layoff that is not on this page.
| Company | What happened | Roles reported | Share of staff | Where | Announced | Sources |
|---|---|---|---|---|---|---|
| Sionna Therapeutics |
Pipeline setback
Sionna Therapeutics publicly announced a 46% workforce reduction while refocusing resources on its SION-451 plus SION-2222 program after disappointing SION-719 results. |
Not known | 46% | Waltham, United States |
Where this comes from
Every cut listed for Sionna Therapeutics was entered by a person who checked it against a filing or a named report. Nothing is scraped and nothing publishes itself. What is not here is what we have not verified, not what did not happen.
Spotted something wrong or missing about Sionna Therapeutics? Tell us on our Discord and we will check it.