Core Insights - The article reports a significant outflow of $497 million from Bitcoin spot ETFs during the trading week from December 15 to December 19 [1] - The Blackrock ETF IBIT experienced the largest weekly outflow of $240 million, while its total historical net inflow stands at $62.49 billion [1] Group 1 - Bitcoin spot ETFs saw a total net outflow of $497 million in the specified week [1] - Blackrock's IBIT ETF had the highest weekly net outflow of $240 million [1] - The historical total net inflow for the IBIT ETF is reported to be $62.49 billion [1]