Bitcoin and Ethereum ETFs Log Over $1B Weekly Inflows, With BlackRock Taking 80%

U.S.-listed spot Bitcoin and Ethereum exchange-traded funds took in more than $1 billion of new money this week, marking their strongest combined inflows since April as appetite for regulated crypto exposure picked up. SoSoValue data shows spot Bitcoin ETFs added $853.54 million in the week ended Aug. 7, the largest weekly intake in nearly four months. The category posted inflows in every session, led by $170.09 million on Monday, $211.49 million on Tuesday, and $244.42 million on Wednesday, before flows cooled later in the week. The total topped the roughly $824 million gathered in the week of April 24 and was the best since the week ended April 17, when the group attracted about $996 million. BlackRock's iShares Bitcoin Trust (IBIT) drove the bulk of the demand, pulling in about $693 million—more than four-fifths of the week's net inflows into spot Bitcoin ETFs. Since their U.S. launch in January 2024, the products have accumulated more than $52 billion in net inflows and now manage about $80 billion in net assets. Security concerns return custody to the spotlight The pickup in ETF demand came shortly after disclosures of a security flaw tied to Coldcard hardware wallets, putting crypto custody back in focus. TRM Labs researchers estimated attackers siphoned roughly 1,816 BTC—about $116 million—from more than 5,200 addresses starting July 30. Other estimates have put losses closer to $130 million as investigations continue. Bloomberg Intelligence ETF analyst Eric Balchunas highlighted the timing of the inflows following the Coldcard losses, while stopping short of saying impacted self-custody users moved directly into ETFs. He said the incident could bolster the argument for institutional custody among investors primarily seeking long-term Bitcoin exposure rather than using the asset for transactions or censorship-resistant payments. In that context, Balchunas noted, the security infrastructure of large financial institutions may become harder to ignore after a failure involving hardware built to keep Bitcoin outside traditional finance. There is no evidence the Coldcard breach directly drove this week's ETF inflows, though the sequence has refocused attention on the tradeoff between self-custody and institutionally held exposure as regulated Bitcoin products post their strongest demand in months. Ethereum ETFs extend a five-week rebound Ethereum-focused ETFs posted an even steeper improvement, bringing in $244.94 million for their best week since April and extending their streak of weekly inflows to five straight periods. The five-week run has added roughly $566 million, the longest weekly inflow streak for the group this year. It is also the longest since a 14-week stretch from May through August 2025 that attracted nearly $10 billion. Ethereum ETFs opened the week with $11.42 million in net outflows on Monday, then flipped sharply positive. Investors added about $53.75 million on Tuesday, $60.86 million on Wednesday, $92.15 million on Thursday, and $49.60 million on Friday. BlackRock again dominated. Its iShares Ethereum Trust (ETHA) took in around $203 million for the week, more than 80% of the category's inflows. Taken together, IBIT and ETHA absorbed about $896 million—over four-fifths of the nearly $1.1 billion that flowed into spot Bitcoin and Ethereum ETFs. The surge marks a clear turnaround from the softer flows seen through much of the summer and offers one of the strongest signals in months that investors are rebuilding crypto exposure through Wall Street's regulated vehicles.