According to @FarsideUK, total spot Bitcoin ETF net inflow for 2025 is $21.3 billion based on their final day flow update published on Jan 1, 2026; source: Farside Investors (@FarsideUK). This figure represents the finalized full-year net flow across spot BTC ETFs, as reported by Farside Investors; source: Farside Investors (@FarsideUK). For trading reference, the $21.3 billion number is the closing 2025 cumulative flow reported by Farside’s tracker; source: Farside Investors (@FarsideUK).