Billion-Dollar Inflow Pushes American Bitcoin ETFs Back into the Green

American spot Bitcoin ETFs attracted $2.4 billion in new capital last week, the largest weekly inflow since October 2025. This marks the first time this year that the net flows of these funds for 2026 are in the green. One strong week does not prove a lasting trend by itself, but the turnaround is sharp: at the beginning of this month, the same funds were still facing significant outflows.

ETF inflows mean that investors are putting money into the publicly traded Bitcoin funds. The week started with a bang: on Monday, the twelve Bitcoin ETFs together received $999.0 million, the largest daily inflow since October 6, 2025. After that, the pace slowed each day: $714.7 million on Tuesday, $347.0 million on Wednesday, $190.6 million on Thursday, and $134.5 million on Friday.

BlackRock's IBIT led the rankings with $1.2 billion for the week, the second-largest weekly inflow since October 2025 for the fund. Fidelity's FBTC raised $701.7 million, the largest weekly total since the week of September 8, 2025. Since their launch, Bitcoin ETFs have cumulatively raised $57.6 billion, with a net asset value of $108.4 billion as of Friday.

From Selling Pressure to Record Week

The rebound follows a sharp decline just two weeks earlier. On September 15, Bitcoin ETFs lost $450.4 million, their worst day since June, after a cloture vote in the U.S. Senate on the Clarity Act failed—a procedural vote needed to close a debate and move to a final vote. The following day, the funds experienced another outflow of $295.9 million.

The turnaround really gained momentum on September 21, when inflows pushed the Bitcoin price above the average cost basis of ETF holders. Bloomberg analyst James Seyffart estimated that cost basis at $81,722, allowing the average investor to make a profit for the first time since January. Bloomberg ETF analyst Eric Balchunas linked the broader turnaround to the U.S. Treasury's plan to buy back more long-term bonds, aligning with earlier signals that ETF flows and institutional positions drive the Bitcoin price.

Ether and Solana Ride the Wave

Spot Ether ETFs followed the same pattern. On Monday, they received $270.0 million, their largest daily inflow since October 7, 2025, followed by daily amounts between $66.0 million and $162.3 million. For the entire week, that totaled $689.9 million, a significant recovery after a loss of $140.0 million the week before. On Friday alone, Ether funds added $86.95 million, with BlackRock's ETHA accounting for $50.37 million and the staking-focused ETHB for $31.88 million.

Solana ETFs recorded a one-day record of $86.7 million on Friday, the largest since the products were launched at the end of October 2025. Bitwise's BSOL accounted for $55.7 million of that. The total assets of Solana funds rose to a record $1.5 billion, up from $1.2 billion a week earlier—a movement that fits how previous inflow waves shifted sentiment among investors.

Weekly Figures Overview

• $2.4 billion: total weekly inflow into American spot Bitcoin ETFs
• $999.0 million: Bitcoin ETF inflow on Monday, the largest daily inflow since October 2025
• $1.2 billion: weekly inflow from BlackRock's IBIT
• $701.7 million: weekly inflow from Fidelity's FBTC
• $689.9 million: weekly inflow into Ether funds
• $86.7 million: record daily inflow into Solana ETFs on Friday
• $57.6 billion: cumulative Bitcoin ETF inflow since launch
• $108.4 billion: net asset value of Bitcoin ETFs as of Friday

According to Nate Geraci, president of NovaDius Wealth Management, Monday's inflow ranks among the nine largest days ever for Bitcoin ETFs. The fact that the daily amounts decreased after Monday shows that momentum quickly faded after the initial shock of the week.

What This Week Does Not Mean

The strong weekly figures do not prove that inflows will continue at the same level in the coming weeks. The decline in daily amounts after Monday indicates that demand cooled after the initial wave. Additionally, the connection Balchunas makes with the Treasury's bond buyback plan is an interpretation, not a proven exclusive explanation for the simultaneous turnaround in Bitcoin, Ether, and Solana ETFs.