US spot Bitcoin ETFs logged $433.0 million in net inflows during Friday's cash session, which combined with Thursday's $159.5 million makes $592.5 million across two days. That more than reverses the $450.3 million and $296.0 million that left Tuesday and Wednesday. The concentration is the notable part: Fidelity's FBTC captured $310.7 million, roughly 72% of the day's total, rather than the flows spreading across the complex the way they did during August's accumulation run.