# Ultragenyx Pharmaceutical Inc.: Form 8-K, filed Dec 29, 2025

- Company: [Ultragenyx Pharmaceutical Inc.](/companies/rare.md) (CIK 1515673)
- Form: 8-K
- Filed: 2025-12-29
- Accepted by EDGAR: Dec 29, 2025, 08:45 ET
- Period: 2025-12-29
- Accession: 0001193125-25-332422
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/1515673/000119312525332422/rare-20251229.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1515673/000119312525332422/

## Items reported

- Item 8.01: Other events

## 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/1515673/000119312525332422/rare-20251229.htm

Filed Dec 29, 2025.
Source: SEC EDGAR, the filing index for accession 0001193125-25-332422. Last ingested by Listed: Nov 10, 2026, 17:33 ET. No prices; not investment advice.