Bitcoin ETFs surge $854M but Wintermute says too early to be bullish
Bitcoin ETFs saw $854M in inflows, with BlackRock's IBIT taking over 80%. Wintermute cautions against bullishness due to weak labor fundamentals and supply pressure. Upcoming CPI data will determine if the rally holds or if rate hike fears return.

*this image is generated using AI for illustrative purposes only.
Bitcoin exchange-traded funds (ETFs) attracted $854 million in net inflows last week, marking their highest weekly total since April, but crypto liquidity provider Wintermute warned investors that it is "too early" to adopt an outright bullish stance. The surge in demand coincided with a disappointing U.S. jobs report, which reduced the probability of a September Federal Reserve rate hike from 55% to 40%, triggering a broad rally across risk assets including equities and cryptocurrencies.
Despite the capital influx, Wintermute’s weekly market update highlighted structural weaknesses in the labor market that undermine the sustainability of the rally. While the unemployment rate fell to 4.1%, this improvement was driven by 264,000 individuals exiting the labor force rather than new job creation. Consequently, labor force participation dropped to its lowest level outside of the COVID-19 pandemic since 1976, and prior months’ job gains were revised downward by 103,000. Wintermute characterized the jobs report as "soft for the wrong reasons," suggesting the economic foundation for the rally remains fragile.
The performance divergence across asset classes during the week illustrates the nuanced market reaction. While gold led gains with a 7.25% weekly return, followed by the Nasdaq at +5.09% and the S&P 500 at +3.51%, Bitcoin rose only 2.15%. Ethereum lagged further with a 1.39% gain. Brent crude was the sole major asset to decline, falling 6.85% as geopolitical tensions eased following a navigation framework agreement between Iran and Oman for the Strait of Hormuz.
| Asset | Weekly Return |
|---|---|
| Gold | +7.25% |
| Nasdaq | +5.09% |
| S&P 500 | +3.51% |
| Bitcoin | +2.15% |
| Ethereum | +1.39% |
| Brent Crude | -6.85% |
Inflow data reveals significant concentration within the Bitcoin ETF complex. Of the $853.5 million flowing into U.S. spot Bitcoin ETFs over five consecutive positive sessions, BlackRock’s IBIT captured more than 80% of the volume. Ethereum ETFs also benefited, adding $244.9 million for a fifth straight week of positive flows. However, Bitcoin underperformed the S&P 500 despite touching an August high above $65,300 on the news of the payrolls print. Wintermute noted that this price gap indicates ETF buying is being met by substantial supply elsewhere in the market, preventing sharper price appreciation.
What the Numbers Show
The disconnect between strong ETF inflows and muted price action suggests that incremental sellers are not yet depleted. Wintermute had previously flagged that seller exhaustion was approaching, and while the predicted flows materialized, prices barely moved. This implies that offside positioning—short bets or sell-side liquidity—remains largely intact. The firm emphasized that sustained ETF buying through the end of summer is required before turning constructive, particularly as upcoming inflation data could reverse the current sentiment.
Market participants are now focused on Wednesday’s Consumer Price Index (CPI) report, which Wintermute identified as the most critical catalyst of the week. A hotter-than-expected print could push September rate hike odds back above 50%, removing the floor that supported last week’s gains. Other key events include Producer Price Index (PPI) data on Thursday, retail sales on Friday, the Jackson Hole symposium from August 27–29, and the Senate cloture vote on the Clarity Act regarding crypto regulation on September 15.
How might the upcoming CPI and PPI data influence the sustainability of the current Bitcoin ETF inflows if inflation proves stickier than expected?
What are the potential market implications if BlackRock's IBIT continues to dominate over 80% of Bitcoin ETF volume, and could this concentration create liquidity risks for other issuers?
Could the divergence between strong ETF inflows and muted Bitcoin price action indicate that institutional supply is being absorbed by specific large holders or market makers rather than genuine retail demand?

































