---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-094754"
form_type: "8-K"
ticker: "BRNS"
cik: "0001828185"
company_name: "Barinthus Biotherapeutics plc."
filed_at: "2025-09-30T23:59:59+00:00"
generated_at: "2026-05-17T05:17:42.900841+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Barinthus (BRNS) merges with Clywedog; Clywedog stockholders to own ~66% of combined company

## Summary
- Clywedog stockholders will receive ~4.36 Topco shares per Clywedog share; Barinthus shareholders receive 1 Topco share per share.
- Clywedog stockholders to own ~66% of combined entity; Barinthus shareholders ~34%.
- Topco may launch self-tender offer for up to $27M of its common stock prior to Merger close.
- Deal expected to close in H1 2026, subject to shareholder approvals, court sanction, antitrust clearance, and Nasdaq listing.
- Voting agreements cover ~25% of Barinthus shares and all Clywedog shares; lock-ups for six months for certain insiders.

## SEC filing metadata
- accession: 0001104659-25-094754
- form_type: 8-K
- ticker: BRNS
- cik: 0001828185
- company_name: Barinthus Biotherapeutics plc.
- filed_at: 2025-09-30T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1828185/000110465925094754/0001104659-25-094754-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1828185/000110465925094754/tm2527141d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-094754
- JSON: https://secwatch.observer/filing/0001104659-25-094754.json
- Plain text: https://secwatch.observer/filing/0001104659-25-094754.txt

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