U.S. spot Bitcoin and Ethereum ETFs attracted $2.6 billion in net capital inflows over the week — the highest result since October 2025, according to data from SoSoValue.
Bitcoin ETFs received $1.9 billion, while Ethereum funds attracted $697.2 million. Both figures were the highest for their respective categories in 2026.
This result reversed an outflow of $392 million recorded the previous week — a swing of approximately $3 billion within a week. The figure also more than doubled the $1.1 billion total inflow for the week ending August 7, which at the time was the strongest result since April.
Bitcoin ETF Trading Volume More Than Tripled
The $1.9 billion inflow into Bitcoin ETFs was the largest weekly result since the week ending October 10, 2025, when the funds received $2.7 billion, SoSoValue data shows. The cumulative net inflow since the launch of Bitcoin ETFs has reached $53.7 billion.
Trading volume increased to $22.1 billion from $6.9 billion the previous week — a rise of over 219%. The funds' assets under management grew by 25.4%, reaching $96.1 billion compared to $76.6 billion, reflecting both new investment inflows and the rise in Bitcoin's price.
The bulk of purchases occurred during the rally on August 19 and 20. On Wednesday, the funds received $517.2 million — the largest daily inflow since May 4. On Thursday, the inflow was $606.3 million, of which $503 million went to BlackRock's IBIT fund.
Ethereum Funds Have Best Week Since October
Spot Ethereum ETFs also recorded their largest weekly inflow since October of last year. The $697.2 million result was the highest since the week ending October 3, 2025, when the funds attracted nearly $1.3 billion.
A week earlier, U.S. Ethereum ETFs recorded a net outflow of $2.3 million. The cumulative inflow since the launch of these funds now stands at $12.2 billion.
Weekly trading volume rose to $6.9 billion from $1.9 billion — a 259.4% increase. Assets under management grew by 35.9%, to $14.3 billion from $10.5 billion.
Ethereum ETF assets now exceed the cumulative net inflow by approximately $2.1 billion. Two weeks prior, the funds' assets were roughly $711 million below the cumulative capital inflow. The reversal is primarily linked to the rise in Ethereum's price.
The strong week did not fully offset the funds' losses since the start of the year. The outflow from Bitcoin ETFs since the beginning of 2026 amounts to about $2.9 billion, and from Ethereum funds to about $191.8 million. The recent inflows reduced the combined deficit of the two categories since the start of the year from $5.7 billion to $3.1 billion.
AI Perspective
From the perspective of machine data analysis, what's more interesting is not the size of the inflow itself, but its structure. The bulk of capital traditionally flows into a single instrument — BlackRock's IBIT, which on Thursday accounted for $503 million of the $606.3 million total daily inflow. The historical parallel here is not the most comforting: in November 2025, the same fund experienced a record one-day outflow of $523 million and lost $2.19 billion over the following four weeks. The concentration of money in a single fund is both a sign of trust from large players and a structural vulnerability: the sentiment of a single institution can reverse a weekly trend as sharply as it created it. Is the market prepared for a symmetrically rapid outflow if the Bitcoin rally halts?
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