U.S.-listed spot Bitcoin and Ether ETFs pulled in a combined $2.615 billion over five trading days ending Aug. 21, marking their strongest weekly intake since October 2025, SoSoValue data show. Big-picture flows and leaders - Bitcoin ETFs attracted roughly $1.917 billion over the week, while spot Ether ETFs drew about $697.5 million. Together, the two categories reversed the prior week’s outflows and delivered the largest five-day haul in months. - BlackRock dominated the final session on Aug. 21, as its iShares Bitcoin Trust (IBIT) took in $239 million and its iShares Ethereum Trust (ETHA) added $151 million—about 79% of that day’s combined $492 million of inflows across both asset classes. - Fidelity’s Wise Origin Bitcoin Fund (FBTC) was the second-biggest Bitcoin winner on Friday, receiving $30.19 million. Cumulative totals and market share - After Friday’s allocations, IBIT’s cumulative net inflows stood at $62.43 billion and FBTC’s at $10.18 billion. All U.S. spot Bitcoin ETFs now hold about $96.07 billion in net assets—roughly 6.17% of Bitcoin’s market value. - ETHA has drawn $12.17 billion since launch. Spot Ether ETFs held $14.30 billion in net assets at the end of the session—about 4.85% of Ether’s market value—and cumulative net inflows for the Ether category were roughly $12.15 billion. Grayscale’s Ethereum Mini Trust ETF added $11.51 million on Friday, lifting its cumulative inflows to $1.85 billion. Daily flow cadence - Bitcoin ETF daily inflows over the five sessions were: Aug. 17 $297.56M, Aug. 18 $189.30M, Aug. 19 $517.19M, Aug. 20 $606.29M, Aug. 21 $307M (sum ≈ $1.917B). - Ether ETF daily inflows were: Aug. 17 $30.85M, Aug. 18 $71.47M, Aug. 19 $189.15M, Aug. 20 $221M, Aug. 21 $185M (sum ≈ $697.47M). - For the two categories combined, Aug. 21 produced $492M in new money, of which BlackRock’s IBIT and ETHA accounted for about $390M. Price action and market dynamics - The surge in ETF demand coincided with rapid price appreciation. Bitcoin broke out of a six-week range, rallying roughly 18% over two days and clearing $76,000 on Aug. 21 after sweeping through resistance at $65k, $70k and $75k. - CoinGlass data cited in the reporting showed nearly $3 billion of crypto positions liquidated as Bitcoin crossed $70,000, with short positions bearing most losses—suggesting forced short-covering and derivatives-driven buying accompanied ETF inflows. - Ether similarly jumped, topping $2,400 after an about-18% 24-hour move. Ether ETFs posted their biggest single-day intake since October 2025 on Aug. 20 ($221M). Context and caveats - The week’s inflows represent a sharp improvement from the week ended Aug. 14, when combined crypto ETF flows were negative (combined withdrawal of roughly $392 million), turning into a roughly $3.01 billion swing from one five-day period to the next. - Analysts offered mixed takes ahead of the late-week surge: Nansen’s Nicolai Søndergaard pointed to forced short-covering, institutional demand and improving liquidity as drivers, while LVRG’s Nick Ruck warned that a single strong day wouldn’t establish a structural allocation trend and that sustained inflows would need further confirmation. The five consecutive positive sessions since then have provided more evidence but not yet a guarantee of a durable shift. Assets under management - By the close of trading on Aug. 21, combined net assets across U.S. spot Bitcoin and Ether ETFs totaled about $110.36 billion—$96.07 billion in Bitcoin products and $14.30 billion in Ether products, according to SoSoValue. Bottom line: institutional and ETF demand helped amplify a fast-moving rally in both coins this week, with BlackRock’s ETF offerings capturing the lion’s share of fresh capital. Whether inflows remain steady will depend on price stability and the emergence of broader allocation catalysts. Read more AI-generated news on: undefined/news