U.S. spot Bitcoin ETFs have logged their strongest three-week inflow stretch of 2026, pulling in $3.8 billion in combined net flows, with $986.9 million arriving in the week ending Friday, September 5, according to data compiled by Farside Investors.
BlackRock‘s IBIT led Friday’s session with $117.4 million in fresh inflows, while total net assets across U.S. spot Bitcoin ETFs stood at $101.3 billion, after briefly touching $103.3 billion the day before. Cumulative net inflows since the funds’ January 2024 launch have now reached $55.6 billion. Flows have been volatile week to week — a $731 million single-day surge on September 3 followed a $236.5 million outflow just two sessions earlier — but the three-week trend points firmly higher.
The renewed buying comes as BTC‘s 50-day moving average closes in on its 200-day moving average, with a golden cross — a chart pattern some traders view as bullish, though a lagging one — projected around September 11. Bitcoin held near $79,000 through the weekend, up roughly 2.6% over the past seven days.
Not every corner of the ETF market shared the momentum. Spot Ether ETF inflows dropped 74% week-over-week to $218.4 million, and XRP ETF inflows fell 83% to $19 million, though both categories remain net positive for the year, with Ether ETFs near $863 million and XRP ETFs around $515 million in year-to-date inflows.
The divergence suggests institutional demand is currently concentrating in Bitcoin rather than spreading evenly across the asset class. Whether the golden cross materializes on schedule, and whether Bitcoin flows can hold their pace into a historically volatile month, will likely shape sentiment heading into mid-September trading.
