---
schema_version: "secwatch.filing_event.v1"
accession: "0001559053-26-000016"
form_type: "8-K"
ticker: "PRTA"
cik: "0001559053"
company_name: "PROTHENA CORP PUBLIC LTD CO"
filed_at: "2026-05-07T23:59:59+00:00"
generated_at: "2026-05-14T21:40:43.375554+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Prothena Q1 net income $32.7M on $50M milestone; raises cash guidance

## Summary
- Net income of $32.7M ($0.60 diluted EPS) vs net loss of $60.2M ($1.12 loss) in Q1 2025.
- Revenue $51.1M (vs $2.8M), primarily from $50M Novo Nordisk milestone for coramitug Phase 3 enrollment.
- Updated FY2026 net cash used guidance to $18-23M (prior $50-55M); year-end cash ~$273M (midpoint), up $18M.
- Initiated up to $100M share repurchase program; repurchased 788,990 shares for $7.3M through Q1.
- PRX019 Phase 1 completed; potential $55M milestone if Bristol Myers Squibb advances by YE 2026.

## SEC filing metadata
- accession: 0001559053-26-000016
- form_type: 8-K
- ticker: PRTA
- cik: 0001559053
- company_name: PROTHENA CORP PUBLIC LTD CO
- filed_at: 2026-05-07T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905326000016/0001559053-26-000016-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1559053/000155905326000016/prta-20260507.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001559053-26-000016
- JSON: https://secwatch.observer/filing/0001559053-26-000016.json
- Plain text: https://secwatch.observer/filing/0001559053-26-000016.txt

## Key facts
- Earnings Releases
  PROTHENA CORP PUBLIC LTD CO reported financial results for first quarter of 2026.
  - Period: first quarter of 2026
  - Result: reported results
  source text: On May 7, 2026, Prothena Corporation plc issued a press release announcing its financial results for the first quarter ended March 31, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1559053/000155905326000016/0001559053-26-000016-index.htm

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