Bitcoin ETF cost basis caps price after $636 million outflow day

The bitcoin ETF cost basis has turned into a ceiling. U.S. spot bitcoin exchange-traded funds recorded $635.6 million of net outflows on Thursday, Oct. 22, the largest one-day withdrawal since June, according to data compiled by The Block. By Friday, bitcoin was trading just above $81,000, below the $82,313 average price at which money has flowed into those funds, CoinDesk reported, citing Glassnode.

What happened

BlackRock's IBIT led the exits with $254.1 million, followed by Fidelity's FBTC at $217.5 million and the ARK 21Shares fund ARKB at $109.4 million, The Block said. Bitwise's BITB and Grayscale's GBTC also lost money. Morgan Stanley's MSBT, launched in April, took in $2.3 million, and the remaining funds were flat.

The reversal erased Wednesday's $528.4 million inflow. Even so, the week was still positive at $442.7 million after inflows of $526.7 million on Monday and $23.2 million on Tuesday. Since launching in January 2024, the funds have drawn more than $57 billion in net inflows and hold over $100 billion in assets, according to The Block.

Other products bled too. U.S. spot ether ETFs lost $110.6 million on Thursday, and Solana and Hyperliquid funds also posted outflows, while XRP funds added $3.6 million. Ether products had taken in $14.9 million the day before. Morgan Stanley's MSBT, the youngest fund in the group, has had only one day of net outflows since its launch, The Block said.

Why it matters

Price and flows fed each other. Bitcoin dropped about 3.4% in a day as the Nasdaq suffered its worst session since June, and CoinGlass counted at least $440 million of leveraged crypto positions liquidated, including $397 million of longs, The Block reported.

History is not encouraging. Farside Investors data cited by CoinDesk show 22 previous days with outflows above $300 million, and on average bitcoin was markedly lower 7, 30 and 90 days later. CoinDesk cautioned that the sample is short and skewed by the bear market that began in October 2025.

When the price sits under the bitcoin ETF cost basis, the average fund holder is under water, and rallies toward that level can meet selling from investors who want to exit near break-even. That is why the $82,313 mark matters more than a round number. Earlier this week we covered the three-day ETF rally that topped $1 billion; last week we tracked weekly crypto ETF outflows of $593 million.

What's next

Analysts are watching the range. "If inflows fade and that floor breaks, the demand picture has weakened," Lorris Beziers of Tesseract Group told The Block, referring to support between $80,000 and $81,000. Jeff Anderson of STS Digital said the recent channel runs from $80,000 to $86,000.

Options traders were not panicking. Derive said its implied probability of bitcoin above $100,000 by Christmas rose to 12% from 9.7% over the week, while the chance of a drop below $70,000 fell to 11% from 15.6%. "What they show is that traders have increased their exposure to year-end upside while reducing their spending on crash protection," Forster said, according to The Block.

The next signals are Friday's flow data and the Fed decision on Oct. 28. A close back above the bitcoin ETF cost basis would show that fund buyers are back in profit.