This is a structural governance filing with no immediate financial impact. Monitor for any future shareholder vote on amending the deed or for any Baker Bros. stake changes that could trigger the 49.9% cap. No trading catalyst.
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Executive Summary
Kiniksa entered into a deed of waiver with Baker Bros. Advisors LP, under which Baker Bros. irrevocably waived its conversion rights on Class A1 and B1 shares to the extent that exercising them would result in Baker Bros. owning more than 49.9% of the company's voting rights. This is a governance/control measure that caps the largest shareholder's voting power, removing the risk of a creeping control change without a shareholder vote.
Key Facts
- Baker Bros. holds 12,781,964 A1 shares and 16,057,618 B1 shares (28,839,582 total special shares) as of May 21, 2026.
- The waiver caps Baker Bros.' voting rights at 49.9% of outstanding voting rights, preventing a control change without a 75% shareholder vote.
- The deed can only be amended or terminated with consent of holders of at least 75% of outstanding ordinary shares.
- All other rights (voting, dividends, return of capital) on the relevant shares remain unaffected.
Financial Impact
No financial consideration exchanged; governance structure adjustment only.
Risk Factors
- Future shareholder vote to amend the deed could alter the cap, but requires 75% supermajority.
- Baker Bros. could still accumulate additional shares up to the 49.9% cap without triggering a control change.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 5 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 8-K Filing (Primary) | 0001730430-26-000025 |
| Document: knsa-20260521x8k.htm | 0001730430-26-000025 |
| Document: 0001730430-26-000025-index-headers.html | 0001730430-26-000025 |
| Document: 0001730430-26-000025-index.html | 0001730430-26-000025 |
| Document: 0001730430-26-000025.txt | 0001730430-26-000025 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 22, 2026 4d ago | 8-K | $80.79 | awaiting T+60 | — | $72.98 (−9.67%) |
Oct 22, 2026 4d ago | Press Release | $80.79 | awaiting T+60 | — | $72.98 (−9.67%) |
Sep 3, 2026 7w ago | 144 | $77.91 | awaiting T+60 | — | $72.98 (−6.33%) |
Jul 28, 2026 12w ago | 8-K | $79.44 $79.70 | ▲ +0.33% | ▼ −4.02% | $72.98 (−8.13%) |
Jul 28, 2026 12w ago | Press Release | $79.44 $79.70 | ▲ +0.33% | ▼ −4.02% | $72.98 (−8.13%) |
May 26, 2026 21w ago | 8-K | $51.84 $78.47 | ▲ +51.37% | ▲ +49.49% | $72.98 (+40.78%) |
May 1, 2026 25w ago | 8-K | $57.62 $80.92 | ▲ +40.44% | ▲ +38.58% | $72.98 (+26.66%) |
Apr 28, 2026 25w ago | 144 | $52.99 $62.84 | ▼ −18.59% | ▼ −14.48% | $72.98 (−37.72%) |
Apr 28, 2026 25w ago | Press Release | $53.85 $63.05 | ▲ +17.08% | ▲ +13.10% | $72.98 (+35.52%) |
Apr 28, 2026 25w ago | Insider Cluster | $53.85 $63.05 | ▲ +17.08% | ▲ +13.10% | $72.98 (+35.52%) |
US Market Status
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