Looking at ETF performance data throughout 2025, Bitcoin maintained its stronghold as the dominant asset in the crypto space. Meanwhile, Ethereum has been chipping away at that lead, steadily expanding its market share. The shift reflects growing institutional interest in Ethereum-based applications and DeFi protocols. While Bitcoin's dominance remains substantial, the gradual erosion of its market cap percentage suggests a maturing market where assets beyond the flagship cryptocurrency are gaining traction. These trends highlight the evolving landscape of crypto ETF investments as more players diversify their portfolio exposure beyond Bitcoin alone.