US Bitcoin and Ether ETFs saw $582M in outflows as prices dipped, extending a pattern of Monday weakness and slower institutional trading.
US Bitcoin and Ether ETFs faced heavy selling as prices dipped on Monday.
Data shows that this was the largest single-day outflow in nearly a month and Bitcoin /Ether ETFs both saw heavy withdrawals as traders reduced exposure.
US Bitcoin and Ether ETFs Face Heavy Monday Selling
US Bitcoin and Ether ETFs recorded a combined $582 million in net outflows on Monday. This stood as the largest daily withdrawal since November 20.
Bitcoin ETFs alone saw $357.6 million exit the market while Ether ETFs followed with $224.8 million in outflows.
Crypto prices dropped during the same session. Bitcoin slid to about $85,100 before recovering slightly and Ether traded below $3,000 as selling pressure grew.
Data from Farside shows that withdrawals were spread across several major funds. Fidelity Wise Origin Bitcoin Fund led the losses, while Bitwise Bitcoin ETF and ARK 21Shares Bitcoin ETF also saw notable redemptions.
Interestingly, BlackRock iShares Bitcoin Trust reported flat flows for the day.
Ether ETFs showed a similar trend. iShares Ethereum Trust accounted for most of the selling, with more than $139 million in redemptions.
Monday Remains a Weak Day for Bitcoin
Monday has earned a reputation as a soft day for Bitcoin trading this year. Velo data has even ranked Monday as the third-worst-performing weekday over the past 12 months.
Only Thursday and Friday rank lower on average returns.
The “Monday Factor”: Historically, Monday has established itself in 2025 as one of the most bearish days. According to data from Velo, it is the third worst day of the week for #Bitcoin, with several of the most significant local lows of the year having been recorded on this day.
— Ismeidy (@ismeidyfinanzas) December 16, 2025
Several local Bitcoin lows during this year appeared on Mondays, and this pattern has drawn attention from traders watching short-term behaviour.
Notably, ETF activity often mirrors this timing as institutions tend to rebalance risk early in the week. That habit can add pressure when sentiment changes.
ETF Cost Basis Draws Market Attention
One level that many traders are eyeing sits near $83,000. This figure stands as the average entry price of Bitcoin held by US spot ETFs.
Analysts calculate it using daily ETF inflows and Bitcoin prices at purchase, and Glassnode data places the current ETF cost basis close to that level. Notably, Bitcoin rebounded from similar prices on November 21 and December 1.
Traders are viewing this area as a test zone because breaks below it could cause more selling. It is worth mentioning that the ETF cost basis does not guarantee support. However, it does offer a reference point tied to institutional behaviour.
Related Reading: New ‘Bitcoin After Dark’ ETF Aims for Overnight BTC Trades
Institutional Risk Trimming Drives Outflows
Meanwhile, institutional investors appear to be using spot ETFs as a fast way to adjust exposure. When risk assets fall, ETF redemptions often follow and the recent weakness in US equities added to that behaviour.
Market observers noted that Bitcoin is trading more closely with tech stocks late this year. Because of this correlation, when Nasdaq names pull back, Bitcoin often reacts faster.
That link explains why ETF flows matter more than spot price moves at times. Allocators manage risk across asset classes, not in isolation.
In all, farside data shows December flows leaning negative so far. Bitcoin ETFs recorded more than $700 million in outflows this month and Inflows totalled about $480 million.
That leaves a net drawdown near $225 million.