June 2025 was a landmark month for US spot Bitcoin and Ethereum exchange-traded funds (ETFs), as they collectively secured nearly $6 billion in fresh inflows. This impressive performance marks one of their strongest showings this year, reflecting heightened institutional interest in crypto. According to SoSoValue data, Bitcoin-focused ETFs attracted the lion’s share of the funds, raising $4.6 billion over 15 days of consistent inflows. This brought their cumulative total to approximately $49 billion in flows, with $134 billion in net assets. Among these funds, BlackRock’s iShares Bitcoin Trust (IBIT) stood out, pulling in $3.85 billion, making it the highest-grossing Bitcoin ETF and reinforcing its position as a dominant player in the sector. Meanwhile, Ethereum ETFs saw a substantial $1.16 billion in new capital, their second-best performance since launching in 2024. Ethereum’s growth is primarily attributed to continued institutional enthusiasm following its successful Pectra upgrade, which enhanced its scalability and security. These Ethereum ETFs now boast $4.2 billion in net inflows and over $10 billion in assets. Crypto ETF summer The solid performance of Bitcoin and Ethereum ETFs has fueled speculation that the SEC is poised to approve additional cryptocurrency ETFs soon. On June 30, Bloomberg analysts Eric Balchunas and James Seyffart raised their approval odds for Solana, Litecoin, and XRP ETFs to 95% by 2025, citing positive developments in the regulatory landscape and increasing institutional demand. The analysts predict that the second half of 2025 will see a wave of new ETF approvals, with the SEC potentially clearing multiple crypto index and basket ETFs by early July. Other altcoins such as Dogecoin, Cardano, Polkadot, and Avalanche are also on the radar, with analysts assigning a 90% chance of SEC approval later in the year. The optimism surrounding these ETFs is largely attributed to the supportive stance of the current US administration, under President Donald Trump, who has advocated for pro-crypto policies. This shift is fueling the belief that the crypto market could be entering a new era of growth and regulatory clarity.