Bitcoin ETFs Swing Positive for 2026 on $2.4 Billion Weekly Inflow

U.S. spot bitcoin exchange-traded funds pulled in $2.4 billion over the week ending September 25, 2026, their largest weekly haul since October 2025 and enough to push cumulative 2026 flows into positive territory for the first time since the summer. Ether, Solana and XRP funds also posted strong weekly inflows, suggesting the rebound in institutional demand extended well beyond bitcoin.

The turnaround is a significant marker for an industry that had spent much of the year in retreat. As recently as July 13, 2026, bitcoin ETFs were sitting $5.8 billion in the red for the year. That deficit narrowed steadily through September and flipped to a $934.1 million surplus on Tuesday, September 22 — a swing of roughly $6.7 billion in a little over two months. The prior week, by contrast, had brought in just $6.2 million, underscoring how abrupt the reversal was.

A Week of Accelerating Demand

The rebound built momentum day by day. Monday, September 21 produced a $999.0 million inflow — the largest single-day total since October 6, 2025, and the ninth-largest day since the ETFs launched in January 2024. Inflows continued through the week, though at a decelerating pace: $714.7 million Tuesday, $347.0 million Wednesday, $190.6 million Thursday and $134.5 million Friday. That capped a seventh consecutive day of inflows dating to September 17, totaling $3.0 billion over that stretch.

Issuer-level detail shows the demand was broad but concentrated among the largest players. BlackRock’s IBIT led with $1.2 billion for the week, its second-best weekly total since October 2025. Fidelity’s FBTC added $701.7 million, its strongest week since September 2025. Ark/21Shares’ ARKB brought in $294.7 million, most of it on Monday, while Morgan Stanley’s MSBT drew $203.3 million — by far its best week since the fund launched in April 2026, when its previous high was just $71.1 million. Since their January 2024 debut, bitcoin ETFs have now accumulated $57.6 billion in net inflows, with net assets standing at $108.4 billion as of Friday. Weekly trading volume, however, actually eased slightly to $15.0 billion from $16.2 billion the week before, suggesting the inflows were driven less by frenetic trading and more by sustained buying.

Ether, Solana and XRP Join the Rally

Ether funds reversed a $140.0 million outflow from the prior week with a $689.9 million inflow, including a $270.0 million Monday session — their strongest single day since October 2025. BlackRock’s ETHA led with $326.2 million, followed by Fidelity’s FETH at $174.0 million, Grayscale’s Ethereum Mini Trust at $100.3 million, and BlackRock’s ETHB at $47.5 million. Ether funds are now up roughly $1.6 billion for 2026, with net assets of $17.8 billion and $13.9 billion in cumulative inflows since launch.

Solana ETFs saw their best single day since their late-October 2025 launch, taking in $86.7 million on Friday alone, with Bitwise’s BSOL contributing $55.7 million of that. For the full week, Solana funds added $188.2 million — second only to their launch week’s $199.2 million — and combined assets hit a record $1.5 billion, up from $1.2 billion a week earlier. Bitwise’s BSOL now holds about 71% of that total. XRP ETFs added $75.6 million for the week, while Grayscale’s Zcash fund briefly crossed $1.0 billion in net assets on Thursday, a notable milestone as investors explore privacy-oriented crypto exposure — a theme also touched on in recent research proposing Zcash-style privacy for Bitcoin.

What’s Driving It, and What to Watch

Commentary attached to the data points away from crypto-specific news and toward macro policy. Bloomberg ETF analyst Eric Balchunas tied the surge to the U.S. Treasury Department’s plan to expand buybacks of long-dated bonds, describing the resulting flow of capital as a “$4.6 billion tsunami of cash.” NovaDius Wealth Management president Nate Geraci put a number on it too, noting that crypto funds have taken in $5.3 billion since the Treasury first signaled the buyback plan — a reminder that bond-market mechanics, not on-chain catalysts, appear to be steering allocator behavior this cycle.

That framing matters for how readers interpret the numbers. This is not a story of retail euphoria or a single headline-grabbing catalyst; it is a story about institutional capital responding to shifts in Treasury market liquidity and, by extension, to broader risk appetite. Large asset managers such as BlackRock, Fidelity and Morgan Stanley — the same firms building out tokenization infrastructure, as seen in BlackRock and Ondo’s work tokenizing entire portfolios — are treating crypto ETFs as another lever in diversified allocation strategies rather than a standalone bet.

Going forward, the key variables to watch are whether the Treasury’s buyback program continues on the scale Balchunas described, whether daily inflows sustain their pace beyond the initial week-long burst, and whether smaller issuers like Morgan Stanley’s MSBT can hold onto their newfound momentum. Trading volume trends also bear watching: a rise in assets without a corresponding rise in volume, as seen this week, can signal longer-term holding rather than short-term speculation. Regulatory developments elsewhere in the sector — including the Federal Reserve’s newly unveiled capital and redemption rules for stablecoin issuers — could also shape investor sentiment toward crypto-linked financial products more broadly.

Source: The Block

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