Large Ethereum holders, known as whales, have been actively accumulating Ethereum over the past month.Net outflows from whale wallets, indicating accumulation, were recorded on only three days in the last month.Over 1.7 million ETH was accumulated during this period, with 175,000 ETH purchased in the last two days alone.While Ethereum's price has shown a gradual increase, an analyst expresses concerns over its relative weakness against Bitcoin.