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BTC 
ETH Bitcoin spot ETF suffered a large net outflow, and Ethereum ETF rebounded against the trend.
Last week, U.S. spot Bitcoin exchange-traded funds (ETFs) recorded a net outflow of US$462.7 million, while the Ethereum ETF showed the opposite strong inflow trend. The four-consecutive day decline from September 8 to September 11 ended the Bitcoin ETF's strongest three-week net inflow record in 2026.
Selling pressure intensified significantly on Thursday, with outflows reaching US$272.7 million that day, the largest net outflow in a single day since July. The subsequent divestment slowed to $13.2 million on Friday.
Analysis of the flow of funds in major bitcoin ETFs
ARK21 Shares bitcoin ETF led this week's withdrawal list with a net outflow of US$234.2 million, followed closely by the gray bitcoin trust ETF with a net outflow of US$129.1 million. BlackRock's iShares Bitcoin Trust ETF recorded an outflow of $52.5 million, while Fidelity's Wise Origin Bitcoin Fund lost $50.7 million.
Despite the correction, as of Friday, the Bitcoin ETF remained positive overall in September, with a cumulative net inflow of approximately US$307.3 million.
Market Background and Ethereum ETF Performance
This outflow of funds comes as Bitcoin prices continue to struggle below the psychological barrier of US$80,000. BTC traded around $77,900 on Monday after failing to maintain its recent rally.
At the same time, the U.S. spot Ethereum ETF recorded a net inflow of $196.9 million over the same four-cycle. At the beginning of the week, the flow of funds from the Ethereum Fund fluctuated greatly: US$24.3 million flowed out on Tuesday, US$34.7 million flowed in on Wednesday, and US$29.9 million flowed out again on Thursday. However, the situation changed sharply on Friday, with related products attracting as much as $216.4 million in capital. Among them, BlackRock's iShares Ethereum Trust ETF contributed US$148.8 million, and the 21Shares core Ethereum ETF brought US$29.1 million.
Macrofactors and Market Outlook
The crypto market is facing another potential volatility catalyst: The Federal Reserve is scheduled to announce its next interest rate decision on September 16. Rising inflation and expectations of tighter monetary policy are putting pressure on risky assets, which may explain the current caution shown by Bitcoin investors.
