A mysterious buyer has acquired 221,166 ETH in the past week, with $212 million purchased in just 24 hours, driving Ethereum's price above $4,000 for the first time in over a year. The purchases were made through six wallets associated with Galaxy Digital, FalconX, and BitGo. Public companies also contributed to the price surge, adding over 304,000 ETH worth $1.3 billion to their holdings, led by BitMine Immersion Technologies. The recent buying activity has increased large-scale Ethereum holdings, with addresses holding over 10,000 ETH reaching their highest level in a year. While analysts predict ETH could reach $20,000, Ethereum co-founder Vitalik Buterin cautions against excessive leverage that could destabilize the market.