An Ethereum whale, inactive for over a decade, has moved its holdings for the first time, according to Arkham monitoring. The address '0x158' originally acquired 2,000 ETH during Ethereum's ICO at a cost of about $620, or $0.31 per ETH. This recent activity marks the first transfer from the address in ten years. At current market prices, the ETH is valued at approximately $4.2 million, reflecting a return of over 6,800 times the initial investment.