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BTC 
ETH 美国现货比特币ETF单日净流入1.595亿美元
美国现货比特币交易所交易基金（ETF）当日录得1.595亿美元的净流入，终结了此前连续两天总计超过7.46亿美元的净流出态势。其中，贝莱德（BlackRock）旗下的IBIT产品贡献了主要增量，单日单独吸金1.84亿美元。这意味着，在整体类别呈现正流入的同时，该类别下的其他基金实际上仍面临净赎回压力。
这一细节至关重要，因为它表明此次资金流入具有高度集中性，而非广泛的基础性需求。当单一基金如IBIT的流入量超过整个类别的总净流入时，通常信号指向一两笔大型机构配置，而非零售投资者或顾问情绪的广泛转变。
以太坊ETF遭遇反向流出，机构偏好显现
同日，以太坊ETF则呈现出相反走势，录得3930万美元的净流出。贝莱德的ETHA基金是赎回的主力军。这种分化显示，尽管两种资产处于相同的宏观环境和利率背景之下，但目前的机构资金更倾向于配置比特币敞口，而非以太坊。
This divergence continues a pattern that has developed for most of the past, especially September: Bitcoin ETFs alternated between small inflows and outflows, while Ethereum ETFs continued to show negative trends. Analysts tracking money flows have not pointed to a single catalyst for Ethereum's relative weakness, but the lack of specific news events for Ethereum this week contrasts with the market regulations and interest rate hikes that have driven the Bitcoin narrative and may partly explain why allocators are moving to assets with clearer story lines.
Market maturity has increased, making it more difficult to interpret short-term emotions
Since its launch in January 2024, the spot Bitcoin ETF category has absorbed tens of billions of dollars in funds. However, daily capital flows over the past two quarters have become more volatile compared to stable inflows in the first year of products. This shift from a one-way trend that lasts for several weeks to a sharp one-day volatility makes it difficult for analysts to interpret short-term market sentiment based solely on single-day data, including this week's rally, and often requires waiting for a longer series of data to point in the same direction before making a judgment.
This week's concentration of inflows in a single fund also reflects the maturity of the ETF industry. In the first year of product launch, multiple issuers, including Fidelity and Grayscale, usually share large inflow days more evenly; and as BlackRock's IBIT asset management grows to the top of its category, it becomes more common for a single issuer to dominate a single day's outflows. This effect of scale gives IBIT the ability to dictate daily headline data for categories alone, which is why analysts increasingly tend to look at issuer level details rather than just the total number of categories when assessing whether a given day's capital flow reflects true broad demand.
