---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-24-000005"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2024-02-21T23:59:59+00:00"
generated_at: "2026-06-05T22:03:12.057886+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Prothena appoints Daniel G. Welch as director and Chair Designate

## Summary
- Board expanded to add Daniel G. Welch as director effective Feb 21, 2024; to be proposed as Chair at next AGM.
- Welch granted option for 132,000 ordinary shares, vesting over five years at the Feb 21 closing price.
- Annual cash retainer of $90,000 as Chair Designate and future Chair, plus standard non-employee director compensation.
- Welch will enter standard indemnification agreement; no material interest in any related transactions.

## SEC filing metadata
- accession: 0001559053-24-000005
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2024-02-21T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000005/0001559053-24-000005-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000005/prta-20240221.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-24-000005
- JSON: https://secwatch.observer/filing/0001559053-24-000005.json
- Plain text: https://secwatch.observer/filing/0001559053-24-000005.txt

## Key facts
- Executive change
  Daniel G. Welch was appointed as Director and Chair Designate at PROTHENA CORP PUBLIC LTD CO.
  - Action: appointed
  - Role: Director and Chair Designate
  source text: On February 21, 2024, the Board of Directors (the “Board”) of Prothena Corporation plc (the “Company”) increased the size of the Board and appointed Daniel G. Welch to serve as a director of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000005/0001559053-24-000005-index.htm

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