# Ultragenyx Pharmaceutical Inc.: Form 8-K, filed Dec 30, 2025

- Company: [Ultragenyx Pharmaceutical Inc.](/companies/rare.md) (CIK 1515673)
- Form: 8-K
- Filed: 2025-12-30
- Accepted by EDGAR: Dec 30, 2025, 16:11 ET
- Period: 2025-12-30
- Accession: 0001193125-25-337099
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/1515673/000119312525337099/rare-20251230.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1515673/000119312525337099/

## 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/1515673/000119312525337099/rare-20251230.htm

Filed Dec 30, 2025.
Source: SEC EDGAR, the filing index for accession 0001193125-25-337099. Last ingested by Listed: Nov 3, 2026, 19:02 ET. No prices; not investment advice.