---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-072192"
form_type: "8-K"
ticker: "RARE"
cik: "0001515673"
company_name: "Ultragenyx Pharmaceutical Inc."
filed_at: "2023-12-21T23:59:59+00:00"
generated_at: "2026-06-07T09:00:50.580995+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Ultragenyx amends bylaws to align with Delaware law and SEC universal proxy card rules

## Summary
- Board approved Second Amended and Restated Bylaws effective December 15, 2023.
- Amendments reflect recent Delaware General Corporation Law changes and SEC universal proxy card rules.
- Reserves white proxy card for company's exclusive use; clarifies ability to disregard non-compliant nominations.
- Includes administrative, ministerial, clarifying and conforming changes.

## SEC filing metadata
- accession: 0000950170-23-072192
- form_type: 8-K
- ticker: RARE
- cik: 0001515673
- company_name: Ultragenyx Pharmaceutical Inc.
- filed_at: 2023-12-21T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1515673/000095017023072192/0000950170-23-072192-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1515673/000095017023072192/rare-20231215.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-072192
- JSON: https://secwatch.observer/filing/0000950170-23-072192.json
- Plain text: https://secwatch.observer/filing/0000950170-23-072192.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.