US Bitcoin spot ETFs experienced a cumulative net inflow of $440.8 million this week, with BlackRock’s IBIT ETF attracting the most significant share at $247.9 million. Other ETFs like Fidelity's FBTC, Bitwise's BITB, and ARK's ARKB also saw positive inflows, while Grayscale's GBTC had a small outflow of $15.3 million.