According to SoSoValue data, over the prior week’s trading days (from April 13 to 17 in U.S. Eastern Time), Bitcoin spot ETFs recorded weekly net inflows of $996 million, the highest weekly inflow level since mid-January 2026, and also marked the third consecutive week of net inflows. This surge in capital inflows coincided with the timing of a shift in market sentiment toward risk assets after the U.S.-Iran situation temporarily eased.
Bitcoin Spot ETF Weekly Data: IBIT Leads the One-Week $906 Million Inflow
(Source: SoSoValue)
Weekly net inflow ranking:
BlackRock IBIT: weekly net inflow of $906 million (historical total net inflows: $64.63 billion)
Ark & 21 Shares ARKB: weekly net inflow of $98.50 million (historical total net inflows: $1.55 billion)
Weekly net outflows:
Fidelity FBTC: weekly net outflow of $104 million (historical total net inflows: $11.01 billion)
As of now, the total net asset value of Bitcoin spot ETFs is $101.45 billion, and the ETF net asset ratio is 6.55% (ETF market cap share of Bitcoin’s total market cap). Cumulative historical net inflows have already reached $57.74 billion.
Ethereum Spot ETF Weekly Data: FETH Leads with a $126 Million Inflow
Weekly net inflow ranking:
Fidelity FETH: weekly net inflow of $126 million (historical total net inflows: $2.36 billion)
BlackRock ETHA: weekly net inflow of $99.23 million (historical total net inflows: $11.83 billion)
Weekly net outflows:
Grayscale ETHE: weekly net outflow of $16.68 million (historical cumulative net outflows: $5.20 billion)
The total net asset value of Ethereum spot ETFs is $14.26 billion, the ETF net asset ratio is 4.87%, and cumulative historical net inflows have reached $11.94 billion.
Macroeconomic Backdrop: Risk-Asset Inflows Driven by Easing U.S.-Iran Tensions
This surge in ETF capital inflows matches the timeline of a temporary easing of U.S.-Iran tensions—after Iran briefly reopened the Strait of Hormuz, it eased global energy supply tension expectations. Traders took the opportunity to rotate into risk assets, including Bitcoin. Polymarket contracts show the probability that Bitcoin will set a new all-time high before December 31 has risen to 17.5%, up from 14% one week earlier.
Analysts note that two key risk factors should be closely watched going forward: if the U.S.-Iran ceasefire agreement breaks down again, it could rekindle risk-off sentiment; the direction of Federal Reserve rate-cut signals could also have a major impact on the Bitcoin and crypto derivatives markets.
FAQ
Why can IBIT continue to dominate the net inflows to Bitcoin spot ETFs?
BlackRock’s IBIT, backed by the brand of the world’s largest asset manager, its large institutional distribution network, and relatively low fees, continues to attract capital allocations from institutional investors. Historical total net inflows amount to $64.63 billion—far ahead of all Bitcoin spot ETFs—reflecting institutional investors’ clear preference for BlackRock’s products through compliant channels.
What does the 6.55% ETF net asset ratio for Bitcoin mean?
A 6.55% ETF net asset ratio means that the value of the Bitcoin market held through spot ETFs currently accounts for 6.55% of Bitcoin’s total market cap—i.e., roughly 1 out of every 15 Bitcoins worldwide is held via the ETF channel. A continued rise in this ratio is typically viewed as an important indicator of accelerating institutional adoption.
What factors could influence the direction of future ETF capital inflows?
Key risk factors include whether the U.S.-Iran ceasefire agreement remains in place (directly affecting risk-asset sentiment), the timing of Federal Reserve rate cuts (directly impacting investors’ risk appetite via the interest-rate environment), and Bitcoin’s own price trend. If Bitcoin can break through key technical resistance levels, it typically attracts more institutional follow-on buying capital.
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