---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-23-000019"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2023-05-16T23:59:59+00:00"
generated_at: "2026-06-14T23:39:46.755676+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Prothena appoints Dr. William H. Dunn, Jr. to Board of Directors

## Summary
- Dr. William H. Dunn, Jr., M.D. appointed to Board effective May 16, 2023.
- Board size increased to accommodate the new appointment.
- Dr. Dunn will receive standard non-employee director compensation per 2023 proxy.
- He will enter into the Company's standard Deed of Indemnification.
- No arrangements or understandings with others led to his selection; no reportable interests.

## SEC filing metadata
- accession: 0001559053-23-000019
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2023-05-16T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905323000019/0001559053-23-000019-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905323000019/prta-20230516.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-23-000019
- JSON: https://secwatch.observer/filing/0001559053-23-000019.json
- Plain text: https://secwatch.observer/filing/0001559053-23-000019.txt

## Key facts
- Executive change
  William H. Dunn, Jr., M.D. was appointed as Director at PROTHENA CORP PUBLIC LTD CO.
  - Action: appointed
  - Role: Director
  source text: On May 16, 2023, the Board of Directors (the “Board”) of Prothena Corporation plc (the “Company”) increased the size of the Board and appointed William H. Dunn, Jr., M.D. to serve as a director of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905323000019/0001559053-23-000019-index.htm

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