U.S. Spot Bitcoin ETFs Record $731 Million Inflow on Sept. 3, Led by BlackRock

U.S. spot Bitcoin ETFs attracted $730.9 million in net inflows on Sept. 3, marking the largest single‑day addition since mid‑January. The surge was driven primarily by BlackRock’s iShares Bitcoin Trust (IBIT), which alone received $454 million.

Breakdown of the inflows

• IBIT (BlackRock): $454 million (≈60% of total)
• ARKB (ARK Invest/21Shares): $138 million
• FBTC (Fidelity): ≈$74 million
• Grayscale Bitcoin products: $57 million combined
• Withdrawals: VanEck HODL (≈$20 million) and WisdomTree BTCW (≈$5 million)

Impact on assets and market share

The combined net assets of U.S. spot Bitcoin ETFs rose to $103.34 billion, representing just over 6% of Bitcoin’s total market capitalization. Cumulative net inflows since the funds launched in January 2024 now total $55.44 billion.

Recent flow volatility

After a $236 million outflow on Sept. 1 (including a $201 million redemption from IBIT), the group returned to net buying on Sept. 2 with $101 million inflows before the large Sept. 3 surge. Similar volatility was observed in August, with both sizable inflows and outflows across the week.

Broader market context

Bitcoin’s price rebounded sharply during the same period, with the listed ETFs gaining between 5.7% and 5.9% on the day. Earlier in August, U.S. Bitcoin ETFs captured $1.92 billion over five trading sessions, accounting for roughly 73% of total crypto‑ETF flows during that week.