U.S. spot Bitcoin ETFs saw $730.9M inflow on Sept. 3, led by BlackRock’s IBIT

# What happened

U.S.-listed spot Bitcoin ETFs recorded $730.9 million in net inflows on Sept. 3, the largest single-day intake since Jan. 14. The surge was concentrated: BlackRock's iShares Bitcoin Trust (IBIT) accounted for about $454 million, roughly 60% of the total.

Other funds that saw substantial inflows were ARK Invest and 21Shares' ARKB with about $138 million, and Fidelity's FBTC with roughly $74 million. Grayscale's two Bitcoin products combined drew about $57 million. VanEck's HODL and WisdomTree's BTCW were the only funds to record outflows, losing close to $20 million and $5 million, respectively.

# Market context

The inflows came as Bitcoin rebounded—U.S.-listed funds posted gains in the session between 5.7% and 5.9%. The ETF group's combined net assets climbed to $103.34 billion, which the article equates to 6.32% of Bitcoin's market capitalization.

This single-day result followed a $236 million withdrawal on Sept. 1, when IBIT alone saw roughly $201 million of redemptions. The Sept. 3 inflow was the largest daily increase since Jan. 14, when the funds attracted $843.6 million.

# Recent flow patterns and drivers

# Who moved the most money

IBIT dominated the Sept. 3 flows and has repeatedly accounted for a large share of inflows during recent buying periods. The article reports IBIT's cumulative net inflows reached $63.94 billion, and a later figure shows BlackRock reported $60.52 billion in net assets for the fund.

# Why this matters for readers tracking capital flows

• The concentration of flows into IBIT shows institutional demand can be highly concentrated by provider during rallies.
• The decline in futures open interest during price advances suggests at least part of the move was driven by spot buying rather than increased leverage.
• Combined ETF assets approaching $103.34 billion mean these funds now represent a measurable slice of Bitcoin's market cap—an input to liquidity and price dynamics as more capital allocates through regulated U.S. products.

# Bottom line

Sept. 3 was the largest daily inflow for U.S. spot Bitcoin ETFs since mid-January, driven mainly by BlackRock's IBIT. The move continued a recent pattern of concentrated inflows into IBIT during rallies and occurred while spot buying outpaced growth in futures leverage according to the data cited.