Bitcoin exchange-traded funds (ETFs) experienced a net outflow of $160.65 million on December 18. BlackRock's IBIT ETF was the only fund to record a positive net flow, gaining $33.44 million. In contrast, Fidelity's FBTC ETF saw a significant outflow of $170.28 million, while Bitwise's BITB and Ark Invest's ARKB ETFs recorded outflows of $11.54 million and $12.27 million, respectively. Other ETFs, including those from Invesco, Franklin, Valkyrie, VanEck, WisdomTree, and Grayscale, reported no net flow changes.