U.S. Spot Bitcoin and Ether ETFs Log $2.62B Weekly Inflow, Biggest Since Oct. 2025

U.S.-listed spot Bitcoin and Ether exchange-traded funds attracted a combined $2.615 billion over the Aug. 17–21 trading week, marking the strongest weekly inflow for the two categories since October 2025, according to SoSoValue. Key figures - Total inflows (Aug. 17–21): $2.615 billion - Spot Bitcoin ETF inflows: about $1.917 billion (around 73%) - Spot Ether ETF inflows: about $697.5 million (around 27%) - End-of-day net assets (Aug. 21): Bitcoin ETFs $96.07 billion; Ether ETFs $14.30 billion; combined AUM $110.36 billion - Share of underlying market value: Bitcoin ETFs about 6.17% of Bitcoin's market cap; Ether ETFs about 4.85% of Ethereum's Fund-level highlights BlackRock's iShares Bitcoin Trust (IBIT) took in $239 million on Aug. 21, nearly 78% of that day's Bitcoin ETF inflow, lifting its cumulative net inflows to $62.43 billion. Fidelity's Wise Origin Bitcoin Fund (FBTC) added $30.19 million on Friday, bringing cumulative inflows to $10.18 billion. On the Ether side, BlackRock's iShares Ethereum Trust (ETHA) led Friday with $151 million and has drawn $12.17 billion since launch. Grayscale's Ethereum Mini Trust ETF added $11.51 million on Friday, taking cumulative net inflows to $1.85 billion. SoSoValue put historical cumulative net inflows across spot Ether ETFs at $12.15 billion. Daily flow breakdown Bitcoin ETFs: - $297.56M (Aug. 17) - $189.30M (Aug. 18) - $517.19M (Aug. 19) - $606.29M (Aug. 20) - $307M (Aug. 21) Ether ETFs: - $30.85M (Aug. 17) - $71.47M (Aug. 18) - $189.15M (Aug. 19) - $221M (Aug. 20, the largest daily intake since Oct. 2025) - $185M (Aug. 21) Market backdrop The inflow surge coincided with a sharp Bitcoin breakout. Over roughly two days, Bitcoin rose about 18%, climbing from the low $60,000s, pushing through $65,000, $70,000 and $75,000, and topping $76,000 on Aug. 21. CoinGlass data cited about $3 billion in crypto liquidations as Bitcoin crossed $70,000, with short positions accounting for most of the forced selling. ETF buying appeared to track the short-covering wave and broader derivatives-driven forced demand. Ether also jumped, rising above $2,400 after gaining roughly 18% in a 24-hour span, aligning with the Aug. 20 $221 million intake. How it compares The roughly $1.92 billion weekly intake into Bitcoin ETFs more than doubled the $853.5 million recorded over the opening week of August and exceeded the $1.42 billion weekly inflow seen in January. The biggest recent weeks were Oct. 6–10, 2025 ($2.71B) and Sept. 29–Oct. 3, 2025 ($3.24B). One week earlier (Aug. 10–14), Bitcoin ETFs posted $389.7 million of outflows, making this week's result about a $2.31 billion swing from the prior five-day period. What analysts are watching Nansen senior research analyst Nicolai Søndergaard cited forced short covering, institutional demand and improving liquidity as key contributors. LVRG Research Director Nick Ruck cautioned that one strong session is not enough to confirm a durable shift in allocation, arguing that sustained inflows need further confirmation. Five straight positive sessions add support, but the staying power of the trend remains uncertain. Friday's leaders BlackRock dominated the final session across both categories, pulling in about $390 million via IBIT and ETHA, roughly 79% of the day's $492 million total ETF inflow. Bottom line A concentrated burst of inflows signals renewed institutional interest in spot crypto ETFs and arrived alongside sharp price breakouts in both Bitcoin and Ether. Whether the move develops into a sustained allocation trend or fades as a momentum-and-short-covering reaction will hinge on upcoming sessions and broader market catalysts.