US Spot Bitcoin and ether Net outflows from exchange-traded funds totaled $582 million on Monday, the biggest losses since November 20, as cryptocurrency markets fell, with Bitcoin falling to $85,100.
According to data from Farside, the Bitcoin ETF saw outflows of $357.6 million, the highest level in nearly two weeks, while the Ethereum ETF saw outflows of $224.8 million on its third day.
According to Velo data, Monday was Bitcoin’s third-worst performing working day in the past 12 months, with average returns trailing only Thursday and Friday. Several of Bitcoin’s major local lows throughout 2025 have occurred on Mondays, a pattern highlighted in the chart below.
A key level to monitor for potential Bitcoin support is the US ETF cost basis. This metric represents the average entry price of Bitcoin held by spot ETFs and is calculated by combining daily ETF inflows with the Bitcoin price at the time of each deposit to form a running average.
According to Glassnode data, the total cost basis of the U.S. Bitcoin ETF is now close to $83,000, and Bitcoin has rebounded from the lows of November 21 and December 1.
Among BTC ETFs, the Fidelity Wise Origin Bitcoin Fund (FBTC) suffered $230.1 million in redemptions. The Bitwise Bitcoin ETF (BITB) and the ARK 21Shares Bitcoin ETF (ARKB) saw significant outflows of $44.3 million and $34.3 million respectively. BlackRock’s iShares Bitcoin Trust (IBIT) reported no net flows for the day, according to data from Farside.
In comparison, the iShares Ethereum Trust (ETHA) accounted for the majority of ETH ETF redemptions, at $139.1 million.
