A large portion of the Ethereum market cap was acquired near the current price, potentially making ETH susceptible to mass losses.Approximately $123 billion of the ETH market cap sits within 0 to 20% above its cost basis, indicating a fragile profit-loss balance.On-chain data reveals that even a minor pullback could result in a significant number of Ethereum tokens going underwater.Whales holding between 10,000 and 100,000 ETH have increased their holdings by around 1 million ETH in the past few weeks.