---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-018283"
form_type: "8-K"
ticker: "BRNS"
cik: "0001828185"
company_name: "Barinthus Biotherapeutics plc."
filed_at: "2026-02-23T23:59:59+00:00"
generated_at: "2026-05-16T01:14:31.726324+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Barinthus (BRNS) amends merger with Clywedog: exchange ratios set, timeline extended to June 30, 2026

## Summary
- Scheme Exchange Ratio set between 0.1 and 0.166667; Merger Exchange Ratio set between 0.000305 and 0.000508.
- Post-closing ownership: Beacon shareholders ~34%, Clywedog stockholders ~66% on fully diluted basis.
- Beacon minimum cash requirements extended to June 30, 2026 ($20.47M); Clywedog minimum to $1M by May 31, 2026.
- Amendment cites unexpected delay from U.S. federal government shutdowns as reason for extended timeline.

## SEC filing metadata
- accession: 0001104659-26-018283
- form_type: 8-K
- ticker: BRNS
- cik: 0001828185
- company_name: Barinthus Biotherapeutics plc.
- filed_at: 2026-02-23T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1828185/000110465926018283/0001104659-26-018283-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1828185/000110465926018283/tm266347d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-018283
- JSON: https://secwatch.observer/filing/0001104659-26-018283.json
- Plain text: https://secwatch.observer/filing/0001104659-26-018283.txt

## Key facts
- Material Agreements
  Barinthus Biotherapeutics plc. amended Amendment to the Agreement and Plan of Merger with Clywedog Therapeutics, Inc. valued at Amendment to exchange ratios and minimum cash requirements in connection with scheme of arrangement (effective 2026-02-22).
  - Action: amendment
  - Agreement: merger
  - Counterparty: Clywedog Therapeutics, Inc.
  - Value: Amendment to exchange ratios and minimum cash requirements in connection with scheme of arrangement
  - Effective: 2026-02-22
  source text: On February 22, 2026, the Beacon, Topco, Merger Sub and Clywedog entered into the Amendment to the Agreement and Plan of Merger
  evidence_url: https://www.sec.gov/Archives/edgar/data/1828185/000110465926018283/0001104659-26-018283-index.htm

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