U.S. bitcoin, ether ETFs saw largest outflows in a month as prices tumbled Monday

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U.S. bitcoin, ether ETFs saw largest outflows in a month as prices tumbled Monday

Monday once again emerges as a pressure point for bitcoin, aligning ETF outflows with recurring bitcoin lows.

By James Van Straten|Edited by Sheldon Reback

Updated Dec 16, 2025, 2:50 p.m. Published Dec 16, 2025, 11:33 a.m.

Crypto bears dominated Monday as U.S. spot ETFs suffered net withdrawals (Rawpixel modified by CoinDesk)

What to know:

• U.S. spot bitcoin and ether ETFs recorded the largest net outflows since Nov. 20.
• Monday has been a consistent pressure point for bitcoin this year, with several major local lows occurring on that day, and Velo data showing Monday as the third-worst performing day over the past 12 months.

U.S. spot bitcoin BTC$87,188.38 and ether ETH$2,936.33 exchange-traded funds lost a combined $582 million in net outflows on Monday, the most since Nov. 20, as crypto markets fell, taking bitcoin to as low as $85,100.

The bitcoin ETFs recorded $357.6 million in outflows, the most in nearly two weeks, with ether ETFs saw $224.8 million exit in a third day of withdrawals, according to data from Farside.

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According to Velo data, Monday is the third-worst performing weekday for bitcoin over the past 12 months, trailing only Thursday and Friday in terms of average returns. Throughout 2025, several of bitcoin’s major local lows have occurred on Mondays, a pattern highlighted in the chart below.

BTCUSD (TradingView)

A key level to monitor for potential bitcoin support is the U.S. 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 bitcoin’s price at the time of each deposit to form a running average.

See also: XRP ETFs pass $1 billion mark with no outflow days since launch

The aggregate cost basis for U.S. bitcoin ETFs currently sits near $83,000, according to Glassnode data, a level that bitcoin has rebounded from during the previous lows on Nov. 21 and Dec. 1.

Among BTC ETFs, Fidelity Wise Origin Bitcoin Fund (FBTC) suffered $230.1 million in redemptions. Bitwise Bitcoin ETF (BITB) and ARK 21Shares Bitcoin ETF (ARKB) posted 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, the iShares Ethereum Trust (ETHA) accounted for the majority of redemptions from ETH ETFs, at $139.1 million.

Bitcoin NewsBitcoin ETFether ETF

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