Bitcoin
Bitcoin Spot ETFs Narrow Inflow Gap With Ethereum Following Strong September Demand
US spot Bitcoin funds attracted $3.8 billion between late August and early September 2026, closing the year-to-date flow deficit against Ethereum products.
Bitcoin spot exchange-traded funds recorded $3.8 billion in net inflows between August 18 and September 5, 2026, led by a $731 million single-day haul on September 3—the highest daily total since January 14—and an additional $174.6 million the following day. This sustained wave of capital has begun narrowing the gap against Ethereum spot funds, which saw their weekly momentum fade and logged their first net outflow since August 11 on September 8.
Despite the recent surge into Bitcoin vehicles, Ethereum spot ETFs maintain a broader lead for 2026 with approximately $863 million in net inflows year-to-date, compared to roughly $1 billion in net outflows across Bitcoin funds. In terms of market returns, Ethereum outpaced Bitcoin over a recent month-long period, climbing 33.04% between August 11 and September 10 compared to a 22.96% gain for Bitcoin.
The divergent trends highlight the structural difference between ETF flows and overall fund growth. Fund assets fluctuate both through the creation or redemption of shares and through price changes in the underlying cryptocurrency, meaning vehicles can expand or contract independently of net investor cash movements.
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