X0607 3 2026-03-18 0 0001913847 Coincheck Group N.V. CNCK 0001339459 Simanson Gary A true C/O COINCHECK GROUP N.V. NIEUWEZIJDS VOORBURGWAL 162 AMSTERDAM P7 1012 SJ NETHERLANDS 1 1 0 0 CEO and President Ordinary shares 233919 D Ordinary shares 485398 I By Thunder Bridge Capital, LLC Ordinary shares 100000 I By spouse Ordinary shares 50000 I By child Ordinary shares 50000 I By child Certain of the securities reported in Column 2 of Table I are restricted stock units ("RSUs"), each of which represents the contingent right to receive one of the Issuer's ordinary shares with a nominal value of one eurocent (EUR 0.01) each, subject to the conditions of the applicable RSU award (including the vesting schedule set forth therein) and the Issuer's 2024 Omnibus Incentive Plan. The Reporting Person is the managing director of Thunder Bridge Capital, LLC. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. /s/ Nelson Mullins Riley & Scarborough LLP, Attorney-in-Fact 2026-03-18