U.S. spot Bitcoin ETFs experienced significant net outflows totaling $1.7873 billion this week, according to Farside Investors data. BlackRock's IBIT led the outflows with $1.304 billion, followed by Fidelity's FBTC with $315 million, and Grayscale's GBTC with $135 million. This marks a notable shift in investor sentiment towards these financial products.