US spot Bitcoin exchange-traded funds (ETFs) attracted $1.92 billion in net inflows during the week ending Friday, marking their strongest weekly performance in nearly 10 months, according to SoSoValue data. The surge brought nearly $2 billion of fresh investor money into the products after months of uneven flows, coinciding with a sharp rally in Bitcoin's price. Since launching in the US in January 2024, the spot Bitcoin funds have become a major conduit for traditional-market investors seeking Bitcoin exposure, and their weekly flows are widely tracked as a barometer of institutional demand.

ETF analyst Nate Geraci said Sunday that spot Ether ETFs also attracted roughly $700 million in weekly inflows. He added that Bitcoin and Ether funds each posted their strongest weekly inflows since October 2025. The spot Ether products, which debuted in the US in July 2024, have typically drawn smaller weekly flows than their Bitcoin counterparts.

The renewed ETF demand came as Bitcoin jumped more than 20% last week. The cryptocurrency briefly surged past $79,000 on Friday after starting the week near $63,000, according to CoinGecko.

Bitcoin ETFs remain in the red for 2026

Despite the latest surge, US spot Bitcoin ETFs have recorded about $2.91 billion in net outflows so far in 2026. The funds saw their heaviest monthly outflows in June, at $4.51 billion, following $2.43 billion in withdrawals in May. August has brought $2.38 billion in net inflows through Friday, making it the strongest month for inflows so far this year (monthly spot Bitcoin ETF flows since October 2025, source: SoSoValue). At last week's pace, roughly two more weeks of similar inflows would be needed just to erase the 2026 deficit, leaving the remaining August trading days as an early measure of whether the rebound holds.

During the last major inflow wave in October 2025, the funds attracted $3.42 billion. Those October inflows preceded the Oct. 10 crypto market crash, which triggered the largest liquidation event in the industry's history, wiping out roughly $19 billion in leveraged positions within 24 hours. Since Oct. 6, when Bitcoin traded near $124,700, its price has plummeted roughly 38% (source: Quinten).

BlackRock's IBIT flashes a "bullish signal"

BlackRock's iShares Bitcoin Trust ETF (IBIT), the largest US spot Bitcoin ETF by assets, was responsible for much of last week's resurgence, attracting about $1.33 billion in net inflows across five consecutive trading days, according to Farside Investors data. IBIT's daily inflows rose from $160.2 million on Monday to $503 million on Thursday, before easing to $239.3 million on Friday.

Bloomberg ETF analyst Eric Balchunas took to X to highlight what he described as a "classic Flipping the Bird pattern" in IBIT's daily flows, adding that he viewed the pattern as a bullish signal.