Key Takeaways
US spot Bitcoin ETFs took in about $2.4 billion in the week ending September 25, 2026, their largest weekly inflow since October 2025, according to SoSoValue data.
The run flipped 2026 net flows positive at roughly $934.1 million year to date, after a seven-day streak that added close to $3 billion.
BlackRock's IBIT led with $1.2 billion and Fidelity's FBTC added $701.7 million, with total US spot Bitcoin ETF net assets near $108.4 billion.
US spot Bitcoin exchange-traded funds pulled in about $2.4 billion in the week ending September 25, 2026, their largest weekly haul since October 2025, according to SoSoValue data reported by The Block.
The run was enough to flip the funds green for the year. After months of outflows during a market that lost roughly half its value, 2026 net inflows turned positive at about $934.1 million, reversing what had been a deep hole. The week capped a seven-day streak that started September 17 and added close to $3 billion on its own.
BlackRock's IBIT led with $1.2 billion, its second-largest week since October 2025. Fidelity's FBTC added $701.7 million, its biggest week since September 2025, and the Ark and 21Shares ARKB fund took in $294.7 million. Morgan Stanley's MSBT drew $203.3 million, its strongest week since the fund launched in April. Across all the US spot Bitcoin ETFs, net assets now sit near $108.4 billion, with cumulative inflows since the January 2024 launch at about $57.6 billion.
Bloomberg ETF analyst Eric Balchunas tied the surge to the Treasury Department's plan to step up buybacks of long-dated bonds, describing a wave of cash moving into risk assets. Bitcoin traded around $84,000 as the flows landed.
The numbers arrive after Chainalysis found the crypto economy barely contracted through the crash, with measured activity down just 1.6 percent even as prices fell about 50 percent. Regulated ETF wrappers are the main pipe institutions use to hold the asset, and the same appetite is turning up elsewhere, from Nasdaq's $100 million investment in Kraken's parent to expand tokenized stocks. When institutional money keeps moving through transparent, onchain rails even in a down market, the infrastructure case gets stronger. Worth watching whether the streak holds.
People Also Ask
How big was the Bitcoin ETF inflow this week?
US spot Bitcoin ETFs took in about $2.4 billion in the week ending September 25, 2026, their largest weekly inflow since October 2025, according to SoSoValue.
Are Bitcoin ETFs positive for 2026 now?
Yes. The week pushed year-to-date net inflows to roughly $934.1 million, flipping the funds positive for the year after earlier outflows.
Which Bitcoin ETF had the most inflows?
BlackRock's IBIT led with $1.2 billion for the week, followed by Fidelity's FBTC at $701.7 million and the ARKB fund at $294.7 million.
Why are Bitcoin ETF inflows rising?
Analysts including Bloomberg's Eric Balchunas linked the move to a Treasury plan to increase buybacks of long-dated bonds, which pushed cash toward risk assets like Bitcoin.
Sources
The Block, SoSoValue, Bloomberg (Eric Balchunas).