Bitcoin exchange-traded funds (ETFs) experienced a significant net outflow of $351.69 million on December 15, driven by widespread redemptions. Fidelity's FBTC led the withdrawals with a $230.12 million outflow, followed by Bitwise's BITB at $44.32 million and Grayscale's GBTC at $27.51 million. Meanwhile, Valkyrie's BRRR was the only ETF to record a positive net flow, gaining $6.00 million. Other major ETFs, including those from BlackRock, Invesco, and WisdomTree, reported no net changes.