U.S. spot Bitcoin ETFs attracted about $2.4 billion in net inflows during the week ending September 25, 2026, pushing their total 2026 flows back into positive territory. It was the funds’ strongest weekly inflow since October 2025 and marked a sharp change from the heavy outflows seen earlier this year.
Bitcoin ETF Inflows Reach $2.4 Billion
Bitcoin ETFs had a notably strong week as investors added approximately $2.4 billion to U.S. spot Bitcoin funds. According to data analyzed by The Block from SoSoValue, the figure represents the largest weekly inflow since the week ending October 10, 2025.
The latest inflows were enough to change the overall picture for 2026. Bitcoin ETFs had been about $5.8 billion in the red as recently as July 13, but the latest buying pushed their year-to-date net flows to roughly $934.1 million positive.
That turnaround highlights how quickly ETF flows can change when institutional and professional investors increase exposure to Bitcoin.
Why Bitcoin ETFs Turned Positive in 2026
The biggest factor was the strong pace of buying during the latest week.
Monday was particularly important, with Bitcoin ETFs recording approximately $999 million in net inflows. That was the largest single-day inflow since October 6, 2025, and one of the biggest daily inflow figures since the ETFs launched in January 2024.
Inflows then continued throughout the rest of the week:
- Monday: $999.0 million
- Tuesday: $714.7 million
- Wednesday: $347.0 million
- Thursday: $190.6 million
- Friday: $134.5 million
The funds recorded inflows on seven consecutive trading days, with the streak beginning on September 17.
The declining daily figures suggest that the weekly result was heavily concentrated at the beginning of the week rather than being evenly distributed across every session.
BlackRock’s Bitcoin ETF Leads Weekly Inflows
BlackRock’s IBIT remained the largest contributor among the Bitcoin ETFs tracked by SoSoValue.
IBIT attracted approximately $1.2 billion during the week. Fidelity’s FBTC followed with about $701.7 million, while ARK and 21Shares’ ARKB recorded approximately $294.7 million.
Morgan Stanley’s MSBT also posted a notable result, bringing in around $203.3 million. That was its strongest weekly inflow since the fund launched in April.
The numbers show that the recent demand was not limited to a single ETF provider, although the largest established funds captured much of the money.
Bitcoin ETF Assets Reach $108.4 Billion
The increase in inflows also lifted the overall size of the U.S. spot Bitcoin ETF market.
Cumulative net inflows since the products launched have reached approximately $57.6 billion, while total net assets stood at about $108.4 billion as of September 25.
Weekly trading volume, however, declined to about $15 billion from $16.2 billion the previous week. This means the rise in assets was driven primarily by net fund inflows and changes in Bitcoin’s market value rather than a simple increase in trading activity.
Treasury Buybacks May Have Helped Investor Demand
Some market analysts have linked the recent ETF inflows with the U.S. Treasury’s plans to increase buybacks of longer-dated government bonds.
Bloomberg ETF analyst Eric Balchunas highlighted the relationship in a post on X, while Nate Geraci of NovaDius Wealth Management also pointed to billions of dollars flowing into the funds following the Treasury’s buyback announcement. These are analysts’ interpretations of the flow data rather than proof that Treasury activity directly caused the Bitcoin ETF inflows.
This distinction is important because ETF flows can be influenced by several factors, including Bitcoin’s price, broader financial conditions, investor positioning and expectations about interest rates.
Ethereum ETFs Also See Strong Inflows
Bitcoin was not the only cryptocurrency ETF market to rebound.
U.S. spot Ethereum ETFs attracted approximately $689.9 million during the same week, reversing the roughly $140 million outflow recorded the previous week.
BlackRock’s ETHA led Ethereum ETF inflows with about $326.2 million, followed by Fidelity’s FETH at $174 million and Grayscale’s Ethereum Mini Trust at $100.3 million.
Ethereum ETFs now have approximately $17.8 billion in net assets and around $13.9 billion in cumulative inflows since launch.
Solana ETFs Set a New Daily Inflow Record
Solana-related ETFs also recorded strong demand.
U.S. spot Solana ETFs attracted $86.7 million on September 25, their largest single-day inflow since launching in late 2025. Bitwise’s BSOL accounted for approximately $55.7 million of that amount.
For the full week, Solana ETFs brought in about $188.2 million. Their combined assets reached a record $1.5 billion by Friday, up from $1.2 billion one week earlier.
What the Bitcoin ETF Inflows Mean
The latest numbers show a significant recovery in investor demand for U.S. spot Bitcoin ETFs. After being deeply negative earlier in 2026, the funds have now moved into positive territory for the year.
However, one strong week does not establish a permanent trend. Investors will be watching whether substantial inflows continue in the coming weeks and whether daily demand remains consistent.
For now, the key takeaway is straightforward: Bitcoin ETFs have moved back into positive 2026 territory after a $2.4 billion weekly inflow, while Ethereum and Solana funds also recorded strong demand.