Ethereum's Vitalik Buterin has returned to the billionaire ranks after Ether's surge past $4,000, a milestone last seen in December 2024. Buterin's on-chain portfolio is valued at approximately $1.04 billion, with a core holding of 240,042 ETH. Ether ETFs are experiencing stronger inflows than Bitcoin ETFs, signaling increased institutional interest. Arkham reported Buterin's on-chain portfolio valuation and Ether surges to $4,332 after breaking the $4,000 barrier, extending its rally to climb 6.38% on Saturday. At press time, ETH is trading at $4,244. There are reports indicating a potential retest of ETH's $4,878 all-time high. Bitcoin's declining market dominance and renewed optimism from traders have influenced the price momentum. A move to $4,500 could trigger a short squeeze, potentially liquidating $1.35 billion in short positions if reached. ETH-focused ETFs recorded $461 million in total flows on Friday, surpassing Bitcoin ETFs at $404 million. BitMine Immersion Technologies, added 208,137 ETH. Buterin warns against risks behind the treasury boom.