Bank of America and the Royal Bank of Canada have significantly increased their holdings in Bitmine (BMNR), a company with Ethereum treasury exposure, according to Q4 2025 13F filings. As of December 31, 2025, Bank of America held 3,162,085 shares valued at approximately $85.8 million, marking a 1668% increase from the previous quarter. Meanwhile, RBC's holdings rose by 121% to 764,797 shares, valued at about $20.7 million. This move indicates a growing trend among traditional banks to gain indirect exposure to Ethereum.