Monex Group Reports 83.6% Stake in Coincheck Group and Enters Voting Agreement with KDDI

Monex Group, Inc. filed an Amendment No. 1 to its Schedule 13D on May 14, 2026, reporting a significant ownership stake in Coincheck Group N.V. (CNCK). As of May 12, 2026, Monex Group holds 136,247,594 ordinary shares, representing 83.6% of the company. This filing primarily documents a new strategic governance agreement. Specifically, Monex Group entered into an Acknowledgement Agreement with KDDI Corporation, following KDDI's entry into a Share Subscription and Investor Rights Agreement (SSA) with the Issuer. Under this agreement, Monex has committed to vote all of its shares to elect a non-executive director nominee designated by KDDI to the Issuer's board. The execution of this voting agreement was a condition precedent to the closing of KDDI's share subscription. The agreement remains in effect as long as KDDI maintains its nomination rights under the SSA. This move solidifies a governance partnership between the majority shareholder and KDDI as a new strategic investor.