US Bitcoin Spot and ether Exchange-traded funds lost a total of $582 million in net outflows on Monday, the most since Nov. 20, as crypto markets fell, sending bitcoin to as low as $85,100.
Bitcoin ETFs saw $357.6 million in outflows, the most in nearly two weeks, and ether ETFs saw outflows of $224.8 million on a third day of withdrawals, according to data from Farside.
According to Velo data, Monday is the third worst-performing day of the week for bitcoin in the last 12 months, trailing only Thursday and Friday in terms of average performance. Throughout 2025, several of bitcoin’s major local lows have occurred on Mondays, a pattern highlighted in the chart below.
A key level to monitor potential bitcoin support is the US ETF cost basis. This metric represents the average inflow price of bitcoin held by spot ETFs and is calculated by combining daily ETF inflows with the price of bitcoin at the time of each deposit to form a moving average.
The aggregate cost basis for US bitcoin ETFs currently sits near $83,000, according to Glassnode data, a level from which bitcoin has recovered during previous lows on Nov. 21 and Dec. 1.
Among BTC ETFs, the Fidelity Wise Origin Bitcoin Fund (FBTC) suffered $230.1 million in redemptions. Bitwise Bitcoin ETF (BITB) and ARK 21Shares Bitcoin ETF (ARKB) recorded notable outflows of $44.3 million and $34.3 million, respectively. BlackRock’s iShares Bitcoin Trust (IBIT) reported no net flows on the day, according to data from Farside.
In contrast, iShares Ethereum Trust (ETHA) accounted for the majority of ETH ETF redemptions, with $139.1 million.
