Bitcoin spot ETFs experienced a significant net outflow of $363 million as of September 22, with none of the 12 products recording any net inflows. Fidelity's FBTC led the outflows with $277 million, followed by ARKB from Ark Invest and 21Shares, which saw a $52.3 million outflow. The total net asset value of Bitcoin spot ETFs now stands at $148.09 billion, accounting for 6.59% of Bitcoin's total market capitalization. Despite the recent outflows, these ETFs have accumulated a cumulative net inflow of $57.35 billion.