---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-21-000040"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2021-10-01T23:59:59+00:00"
generated_at: "2026-06-28T23:54:43.686255+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Prothena appoints Tran Nguyen as Chief Strategy Officer, Brandon Smith as COO

## Summary
- Tran B. Nguyen appointed to new role of Chief Strategy Officer, retains CFO title.
- Brandon S. Smith appointed Chief Operating Officer, replacing Nguyen in that role.
- Smith's base salary increased to $450,000; bonus target raised to 50% of Q4 2021 salary.
- Smith granted option to purchase 25,000 ordinary shares, vesting over four years.
- Changes effective immediately as of September 29, 2021.

## SEC filing metadata
- accession: 0001559053-21-000040
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2021-10-01T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905321000040/0001559053-21-000040-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905321000040/prta-20210929.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-21-000040
- JSON: https://secwatch.observer/filing/0001559053-21-000040.json
- Plain text: https://secwatch.observer/filing/0001559053-21-000040.txt

## Key facts
- Executive change
  Tran B. Nguyen was appointed as Chief Strategy Officer at PROTHENA CORP PUBLIC LTD CO.
  - Action: appointed
  - Role: Chief Strategy Officer
  source text: appointed Tran B. Nguyen to the additional and newly created role of the Company’s Chief Strategy Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905321000040/0001559053-21-000040-index.htm
- Executive change
  Brandon S. Smith was appointed as Chief Operating Officer at PROTHENA CORP PUBLIC LTD CO.
  - Action: appointed
  - Role: Chief Operating Officer
  source text: Brandon S. Smith to replace Mr. Nguyen as the Company’s Chief Operating Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905321000040/0001559053-21-000040-index.htm

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