Here is the latest update on US spot BTC ETF flows for Mon, Oct 19, 2026. Spot Bitcoin ETFs enjoyed an exceptionally strong start to the week, completely reversing the trend of net outflows that closed out the previous week. On Monday, returning demand drove total net inflows up to +$526.7m. This dramatic market shift was heavily fueled by IBIT, which alone secured an impressive +$665.2m. Overall, this data highlights a rapid and highly positive turnaround in ETF interest right out of the gate.