US spot Bitcoin ETFs took in almost $2.4 billion over the week. IBIT and FBTC captured most of the money, pushing year-to-date net flows back above zero.
US spot Bitcoin ETFs attracted almost $2.4 billion in net inflows during September 21–25. The daily figures published by Farside Investors add up to $2.3858 billion. The week also erased the group’s year-to-date net outflows: our calculation from the same data set puts the 2026 balance at roughly positive $1.02 billion through September 25.
The figures cover fund flows into US-listed spot Bitcoin ETFs, rather than direct purchases on crypto exchanges. At the previous Friday’s close, year-to-date flows were still about $1.36 billion below zero. Five trading sessions turned that balance positive.
Two funds captured 78% of the week’s inflows
BlackRock’s IBIT led the group with about $1.16 billion in net inflows. Fidelity’s FBTC followed with $701.6 million. Together, the two funds accounted for roughly 78% of the weekly total. ARKB brought in $294.7 million, while MSBT added $203.3 million.
On Friday, IBIT and FBTC remained positive, but BITB recorded $11.8 million in outflows. The other funds in Farside’s table showed zero net flows that day.
A strong Monday gave way to a slower Friday
Monday and Tuesday delivered a combined $1.71 billion, or about 72% of the week’s inflows. Money kept coming in over the remaining sessions, although the daily amounts declined.
| Date | Net inflow |
|---|---|
| September 21, 2026 | 999.0 |
| September 22, 2026 | 714.7 |
| September 23, 2026 | 346.9 |
| September 24, 2026 | 190.7 |
| September 25, 2026 | 134.5 |
Source: Farside Investors, checked on September 27. Friday extended the positive run to seven trading sessions. Across those sessions, from September 17 through September 25, cumulative net inflows reached about $2.98 billion.
Positive flows do not settle the price outlook
Adding up Farside’s historical daily records shows the 2026 net flow balance moving above zero on September 22 and reaching $1.0213 billion on September 25. The calculation uses the provider’s figures as observed on September 27; subsequent revisions could change the total.
Net flows turned positive, not necessarily investment returns. Inflows exceeding outflows do not establish that ETF shares or Bitcoin have gained since the start of the year. Our guide to reading ETF flow data separates net flows from fund assets and trading volume.
Weekly inflows alone do not determine where the Bitcoin price goes next. As our analysis of ETF flows and price illustrates, positive fund demand can coexist with weak price performance. Nor does the aggregate flow table establish that every buyer is an institution.
The weekly Bitcoin ETF figures do not identify the buyers or forecast whether inflows will continue at the same pace.
