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 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 additional context, the space also saw a record exit of $3.4 billion in early June 2026.