# Sionna Therapeutics

> Sionna Therapeutics, Inc. (Nasdaq: SION) is a clinical-stage biopharmaceutical company in Waltham,
> Massachusetts developing first-in-class small molecules that stabilize nucleotide-binding domain 1
> (NBD1) of the cystic fibrosis transmembrane conductance regulator (CFTR) protein, together with
> complementary CFTR modulators, to restore CFTR function for people living with cystic fibrosis.
> Sionna publishes no public API, SDK, webhook surface, or machine-readable specification. This file
> was generated by API Evangelist from the company's public website; it is not published by Sionna.

## About

- [Home](https://www.sionnatx.com/): Company overview and latest news.
- [About Us](https://www.sionnatx.com/about-us/): Company, leadership team, and board of directors.
- [Our Science](https://www.sionnatx.com/our-science/): NBD1 stabilization approach, scientific presentations, literature, and podcast.
- [Pipeline](https://www.sionnatx.com/pipeline/): Clinical and preclinical programs, including SION-719, SION-451, SION-2222 (galicaftor), and SION-109.
- [Join Us](https://www.sionnatx.com/join-us/): Careers and open positions.
- [Contact Us](https://www.sionnatx.com/contact-us/): Corporate, media, investor, and medical-information contacts.

## Investors

- [Investor Relations](https://investors.sionnatx.com/): News releases, stock information, SEC filings, and corporate governance.

## Legal

- [Privacy Policy](https://www.sionnatx.com/privacy-policy/)
- [Terms of Use](https://www.sionnatx.com/terms-of-use/)

## APIs

Sionna Therapeutics publishes no developer program, public API, SDK, or machine-readable API
specification. Probed 2026-08-27: /openapi.json, /openapi.yaml, /swagger.json, /v1/openapi.json,
/api-docs, /docs, /redoc, /graphql, /apis.json, /llms.txt, /developers, /developer, /api and every
/.well-known/ discovery path all returned HTTP 404 on www.sionnatx.com. No GitHub organization exists
for the company, and no first-party package was found on npm, PyPI, or any other public registry.
The only machine-readable endpoint on the host is the WordPress CMS default /wp-json/ route table,
which describes the marketing site's own content management, not a product API.

## API Evangelist profile

- [apis.yml](https://raw.githubusercontent.com/api-evangelist/sionna-therapeutics/refs/heads/main/apis.yml): Machine-readable APIs.json profile of this company.
- [Domain security probe](https://raw.githubusercontent.com/api-evangelist/sionna-therapeutics/refs/heads/main/security/sionna-therapeutics-domain-security.yml): TLS, HSTS, DNSSEC, CAA, SPF, and DMARC posture.
- [Well-known probe](https://raw.githubusercontent.com/api-evangelist/sionna-therapeutics/refs/heads/main/well-known/sionna-therapeutics-well-known.yml): Recorded absence of every /.well-known/ discovery document.