---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-24-000028"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2024-09-27T23:59:59+00:00"
generated_at: "2026-05-31T01:09:48.404234+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Prothena CMO Hideki Garren departs; Chad Swanson appointed Chief Development Officer

## Summary
- Hideki Garren, M.D., Ph.D., resigns as Chief Medical Officer effective Sept 27, 2024, to lead global product development at a large pharma.
- Chad Swanson, Ph.D., promoted to Chief Development Officer; will lead clinical development and medical functions.
- Swanson joined Prothena in Jan 2023 from Eisai, where he led the lecanemab program for early Alzheimer's disease.
- Prothena will initiate a search for a new Chief Medical Officer.
- Swanson will join the executive leadership team and report to CEO Gene Kinney.

## SEC filing metadata
- accession: 0001559053-24-000028
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2024-09-27T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000028/0001559053-24-000028-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000028/prta-20240923.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-24-000028
- JSON: https://secwatch.observer/filing/0001559053-24-000028.json
- Plain text: https://secwatch.observer/filing/0001559053-24-000028.txt

## Key facts
- Executive change
  Hideki Garren resigned as Chief Medical Officer at PROTHENA CORP PUBLIC LTD CO.
  - Action: resigned
  - Role: Chief Medical Officer
  source text: On September 23, 2024, Hideki Garren, M.D., Ph.D., Chief Medical Officer of Prothena Corporation plc (the “Company”) notified the Company that he is resigning from the Company effective September 27, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905324000028/0001559053-24-000028-index.htm

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