X0609 4 2026-05-29 0001730430 Kiniksa Pharmaceuticals International, plc KNSA 0001403322 Malley Thomas true C/O KINIKSA PHARMACEUTICALS INT'L 105 PICCADILLY, SECOND FLOOR LONDON X0 W1J 7NJ UNITED KINGDOM true false false false 0 Class A Ordinary Shares 2026-05-29 4 M 0 2799 A 15345 D Class A Ordinary Shares 71967 I See footnote Share Option 48.38 2026-05-29 4 A 0 12158 0 A 2036-05-28 Class A Ordinary Shares 12158 12158 D Restricted Share Units 2026-05-29 4 A 0 2026 0 A Class A Ordinary Shares 2026 2026 D Restricted Share Units 2026-05-29 4 M 0 2799 0 D Class A Ordinary Shares 2799 0 D Each Restricted Share Unit (RSU) represents a contingent right to receive one Class A Ordinary Share of the Issuer. Mr. Malley is the president of Mossrock Capital, LLC (Mossrock) and may be deemed to beneficially own the shares owned by Mossrock. The option vests and becomes exercisable in twelve substantially equal monthly installments following the date of the grant with the final installment vesting on the earlier of a) the anniversary of the date of the grant and b) the date of the Issuer's annual meeting of shareholders in the following year. The date of the grant is May 29, 2026. The RSUs vest in their entirety on the earlier of a) the anniversary of the date of the grant and b) the date of the Issuer's annual meeting of shareholders in the following year. The date of the grant is May 29, 2026. The RSUs vested in a single installment on May 29, 2026; there was no expiration date for the RSUs. /s/ Douglas Barry, Attorney-in-Fact 2026-06-02