Bitcoin, Ethereum, and Solana Spot ETFs Attract Over $529 Million in Weekly Institutional Inflows

From December 8 to December 12, 2025, the cryptocurrency market witnessed a significant wave of institutional capital entering through spot Exchange-Traded Funds (ETFs). Data aggregated by Wu Blockchain reveals that spot ETFs tracking Bitcoin (BTC), Ethereum (ETH), and Solana (SOL) collectively recorded over $529 million in net inflows for the week, with not a single ETF across these assets experiencing net outflows.

Bitcoin spot ETFs led the charge with $287 million in net inflows over the five-day period, reversing losses from the prior week. On December 12 alone, these funds saw $49.16 million in inflows. Total net assets for U.S. Bitcoin spot ETFs now stand at approximately $118.27 billion, representing roughly 6.6% of Bitcoin's total market capitalization. Trading activity remained robust, with $18.8 billion in value traded. BlackRock's iShares Bitcoin Trust (IBIT) was a primary driver, adding over $51 million in a single day and now holding more than $70 billion in net assets.

Ethereum spot ETFs followed closely, securing $209 million in weekly net inflows. This performance underscores ETH's position as a foundational asset for diversified institutional portfolios. The inflows occurred even as ETH prices moved sideways, suggesting confidence may be tied to the network's ongoing scaling solutions and upcoming protocol upgrades.

Solana spot ETFs, while smaller in scale, posted a notable $33.6 million in net inflows. A key detail highlighted by analysts is that none of the seven Solana ETFs recorded net outflows during the entire week. This consistent, albeit modest, inflow pattern indicates a broadening of institutional interest beyond just Bitcoin and Ethereum, pointing to growing comfort with high-performance alternative layer-one blockchains.

The sustained inflows, occurring despite choppy price action and cautious market sentiment, signal that institutional investors are using regulated products to position for the long term. The data suggests a strategy of buying dips and diversifying exposure across multiple core crypto assets rather than rotating capital out of the sector.