Bitcoin ETFs pull in $643M in a single day, the largest inflow since January

Spot Bitcoin ETFs just had their best day in months. Net inflows hit $731 million on September 3, marking the largest daily haul since mid-January 2026 and extending a streak that’s starting to look less like a blip and more like a trend. BlackRock’s iShares Bitcoin Trust, better known by its ticker IBIT, accounted for the lion’s share of the action, pulling in approximately $454 million. Fidelity’s FBTC and ARK 21Shares’ ARKB also contributed meaningful numbers, but IBIT continues to be the gravitational center of the spot Bitcoin ETF universe. The numbers behind the surge The single-day spike didn’t happen in a vacuum. Weekly inflows for the period ending September 4 climbed to roughly $987 million, suggesting that the September 3 figure was the crescendo of a broader buying wave rather than a one-off anomaly. August 2026 was already shaping up as a standout month for Bitcoin ETF flows. Total inflows for the month landed around $3.5 billion, making it the strongest monthly performance since September 2025. Prior to the recent surge, high inflow days in January 2026 had recorded totals between $697 million and $760 million, setting context for this notable resurgence. For addition...