This week’s cryptocurrency market sell-off has been reflected in the broader exchange-traded fund (ETF) sector, with BlackRock among the entities experiencing significant outflows.

Specifically, the asset manager’s Bitcoin (BTC) and Ethereum (ETH) spot ETFs collectively recorded a net outflow of approximately $524 million for the week ending October 17, 2025.

The BlackRock iShares Bitcoin Trust (IBIT) led the retreat, with roughly $279 million in outflows during the week.

The heaviest withdrawals occurred on October 17, when IBIT shed about $268.6 million, marking one of its largest single-day outflows in recent months.

Similarly, the BlackRock Ethereum Trust (ETHA) saw $245 million in net outflows, weighed down by a $146 million withdrawal on Friday and another $310 million outflow earlier in the week.

These figures mirror a broader negative trend across the spot crypto ETF market. Total Bitcoin ETFs registered around $1.23 billion in outflows during the same period, reflecting sustained selling pressure following the mid-October market correction.

Ethereum ETFs also ended the week in the red, posting an aggregate $232 million net outflow across issuers.

Crypto market sell-off

Indeed, these ETF outflows contributed to the general bearish sentiment in the market. Beyond the ETF movements, concerns over the U.S. regional banking sector and rising credit risks triggered a risk-off sentiment, spilling over into cryptocurrencies. Losses in banks and fears of contagion led to significant crypto sell-offs.

At the same time, geopolitical tensions between the U.S. and China, particularly the threat of 100% tariffs on Chinese tech exports, further added to the market’s instability. 

These factors caused sharp declines in Bitcoin which is increasingly under threat of losing the $100,000 support. 

By press time, Bitcoin was trading at $107,072, having made modest gains of about 1% in the past 24 hours, while Ethereum had gained 3% over the same period to $3,879.

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