---
schema_version: "secwatch.filing_event.v1"
accession: "0001730430-26-000025"
form_type: "8-K"
ticker: "KNSA"
cik: "0001730430"
company_name: "Kiniksa Pharmaceuticals International, plc"
filed_at: "2026-05-26T20:55:02+00:00"
generated_at: "2026-05-26T20:57:00.130090+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Kiniksa caps Baker Bros. voting power at 49.9% by waiving conversion rights

## Summary
- Baker Bros. entities hold 12.78M A1 and 16.06M B1 shares; they waive conversion into A/B shares if ownership exceeds 49.9% voting rights.
- Waiver is irrevocable and unconditional; amendment requires at least 75% shareholder approval.
- Deed prohibits circumvention; any conversion attempt violating the cap is void ab initio.
- Other shareholder rights (voting, dividends, capital return) remain unaffected.

## SEC filing metadata
- accession: 0001730430-26-000025
- form_type: 8-K
- ticker: KNSA
- cik: 0001730430
- company_name: Kiniksa Pharmaceuticals International, plc
- filed_at: 2026-05-26T20:55:02+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1730430/000173043026000025/0001730430-26-000025-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1730430/000173043026000025/knsa-20260521x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001730430-26-000025
- JSON: https://secwatch.observer/filing/0001730430-26-000025.json
- Plain text: https://secwatch.observer/filing/0001730430-26-000025.txt

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