Quantum Solutions, a Japanese-listed Ethereum treasury company, has increased its Ethereum holdings to 5,418.32 ETH. The company, backed by Ark Invest founder Cathie Wood, disclosed the acquisition of an additional 187.53 ETH, bringing its total purchase cost to $20.58 million at an average price of $3,943 per ETH. This positions Quantum Solutions as the 15th largest holder among listed Ethereum treasury companies. Additionally, the company holds 11.6 BTC.