---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-282661"
form_type: "8-K"
ticker: "RARE"
cik: "0001515673"
company_name: "Ultragenyx Pharmaceutical Inc."
filed_at: "2022-11-10T23:59:59+00:00"
generated_at: "2026-06-21T22:50:41.004678+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Ultragenyx CFO Mardi Dier resigns effective Nov 15; search underway

## Summary
- Mardi Dier voluntarily resigns as EVP and CFO effective November 15, 2022.
- Company has commenced a formal search for a new CFO.
- Dier leaves to pursue another opportunity.

## SEC filing metadata
- accession: 0001193125-22-282661
- form_type: 8-K
- ticker: RARE
- cik: 0001515673
- company_name: Ultragenyx Pharmaceutical Inc.
- filed_at: 2022-11-10T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1515673/000119312522282661/0001193125-22-282661-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1515673/000119312522282661/d407323d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-282661
- JSON: https://secwatch.observer/filing/0001193125-22-282661.json
- Plain text: https://secwatch.observer/filing/0001193125-22-282661.txt

## Key facts
- Executive change
  Mardi Dier resigned as Executive Vice President and Chief Financial Officer at Ultragenyx Pharmaceutical Inc..
  - Action: resigned
  - Role: Executive Vice President and Chief Financial Officer
  source text: On November 10, 2022, Ultragenyx Pharmaceutical Inc. (the “ Company ”) announced that Mardi Dier had informed the Company of her decision to voluntarily resign from her position as the Company’s Executive Vice President and Chief Financial Officer, effective as of November 15, 2022, to pursue another opportunity.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1515673/000119312522282661/0001193125-22-282661-index.htm

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