---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-25-000049"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2025-12-12T23:59:59+00:00"
generated_at: "2026-05-16T13:21:15.252116+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Prothena board member Paula Cobb resigns effective Dec 31, 2025

## Summary
- Paula Cobb notified Prothena of her resignation from the Board, effective December 31, 2025.
- She will continue serving on the Board, Compensation Committee, and Audit Committee through that date.
- Resignation is not due to any disagreement with the Company on operations, policies, or practices.

## SEC filing metadata
- accession: 0001559053-25-000049
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2025-12-12T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905325000049/0001559053-25-000049-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905325000049/prta-20251210.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-25-000049
- JSON: https://secwatch.observer/filing/0001559053-25-000049.json
- Plain text: https://secwatch.observer/filing/0001559053-25-000049.txt

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