US-listed spot Bitcoin and Ether ETFs recorded a combined $2.61 billion in net inflows over five trading sessions, marking their strongest weekly performance since October 2025.
Bitcoin ETFs accounted for approximately $1.92 billion, or 73% of the combined total, while Ether ETFs attracted nearly $697.5 million. The surge represents a sharp reversal from the previous week, when the two categories collectively recorded about $392 million in outflows.
Bitcoin ETFs Lead the Weekly Surge
According to SoSoValue data, US spot Bitcoin ETFs recorded $307 million in inflows on Aug. 21, extending their positive streak to five consecutive sessions.
BlackRock’s iShares Bitcoin Trust (IBIT) dominated the latest session with approximately $239 million, followed by Fidelity’s Wise Origin Bitcoin Fund (FBTC) with $30.19 million.
The five-day run brought Bitcoin ETF inflows to roughly $1.92 billion:
- Aug. 17: $297.56 million
- Aug. 18: $189.30 million
- Aug. 19: $517.19 million
- Aug. 20: $606.29 million
- Aug. 21: $307 million
The latest weekly figure was more than twice the $853.5 million recorded during a five-day inflow streak earlier in August.
Bitcoin ETFs now hold approximately $96.07 billion in net assets, equivalent to around 6.17% of Bitcoin’s market capitalization.
Ether ETFs Post Strongest Run in Months
Spot Ether ETFs also delivered a powerful performance, recording inflows during all five sessions of the week.
The funds attracted approximately $185 million on Aug. 21, bringing their weekly total to around $697.47 million.
BlackRock’s iShares Ethereum Trust ETF (ETHA) led the latest session with roughly $151 million, while Grayscale’s Ethereum Mini Trust added approximately $11.51 million.
ETHA has accumulated around $12.17 billion in net inflows since launch. Across the entire US spot Ether ETF market, net assets stood at approximately $14.3 billion.
The weekly inflow sequence was:
- Aug. 17: $30.85 million
- Aug. 18: $71.47 million
- Aug. 19: $189.15 million
- Aug. 20: $221 million
- Aug. 21: $185 million
The result also surpassed the entire July inflow total for Ether ETFs, when the products attracted approximately $365 million.
ETF Demand Rises Alongside Crypto Rally
The strong ETF flows coincided with a sharp recovery across the broader crypto market.
Bitcoin broke above $76,000 during the week after rapidly moving through the $65,000, $70,000 and $75,000 levels. The rally was accompanied by significant short liquidations, with nearly $3 billion in crypto positions reportedly wiped out as BTC moved higher.
Ether also climbed above $2,400, gaining strongly during the same period.
Analysts have pointed to several factors behind the move, including short covering, renewed institutional demand and improving liquidity conditions. However, some market observers have cautioned that several weeks of sustained inflows would be needed before the latest ETF activity can be viewed as a durable shift in institutional allocation.
The latest five-session streak provides a stronger signal than a single day of inflows, with Bitcoin and Ether products collectively absorbing more than $2.6 billion.
BlackRock Dominates the Final Session
BlackRock emerged as the biggest beneficiary of Friday’s institutional demand.
Its IBIT and ETHA funds together attracted approximately $390 million, representing nearly 79% of the combined Bitcoin and Ether ETF inflows for the session.
By the end of Aug. 21, US spot Bitcoin and Ether ETFs collectively held approximately $110.36 billion in net assets.
The sharp reversal from the previous week suggests that institutional demand for crypto exposure has strengthened alongside Bitcoin and Ether’s price recovery. Whether that momentum continues will depend on sustained ETF allocations, broader liquidity conditions and whether the recent rally can hold above its newly established support levels.
