According to the source, Tokyo-listed Quantum Solutions Co., Ltd. disclosed it acquired 2,365 ETH over the past 7 days for its corporate treasury and stated it is now the largest ETH treasury holder among Japan-listed companies (Source: Quantum Solutions Co., Ltd. timely disclosure on the Tokyo Stock Exchange). The company is reported to be backed by ARK Invest via a declared equity stake (Source: Major Shareholder Report filed with the Kanto Local Finance Bureau). For traders, confirmed listed-company ETH accumulation of this size can add spot demand; monitor ETHJPY spot volumes during Tokyo hours, ETH perpetual funding, and changes in exchange reserves to gauge follow-through and potential basis shifts (Source: Company disclosure; Tokyo Stock Exchange filings; public on-chain exchange reserve datasets).