US spot Bitcoin exchange-traded funds posted their first daily net outflow in more than two weeks on Sept. 30, breaking a nine-session inflow streak that had carried cumulative flows back toward their all-time high.

The 12 US-listed funds recorded $148.7 million in net withdrawals on the final trading day of September, according to flow data tracked by Farside Investors. The reversal ended a run of nine consecutive positive sessions that had brought in approximately $3.08 billion.

Fidelity's Wise Origin Bitcoin Trust (FBTC) drove most of the outflow, shedding $125.6 million — roughly 85% of the complex's total for the session. Bitwise's Bitcoin ETF (BITB) lost $13.6 million, and BlackRock's iShares Bitcoin Trust (IBIT) shed $9.5 million. The remaining nine funds in the complex recorded no net flows.

September stays strongly positive despite the reversal

The single-day outflow did little to dent what was otherwise the second-strongest month of the year. US spot Bitcoin ETFs attracted approximately $2.65 billion in net inflows during September, trailing only August's $3.52 billion. The September figure brings net inflows for 2026 to roughly $930 million, after redemptions through much of the year had kept the complex underwater on a year-to-date basis.

The recovery has also narrowed a drawdown that at one point erased close to a fifth of the products' lifetime cumulative inflows. Bloomberg Intelligence data show the funds peaked at approximately $62.8 billion in cumulative net inflows on Oct. 10, 2025. Months of sustained redemptions followed, and by July 13 the cumulative drawdown from that peak had reached about $12 billion, leaving lifetime flows near $50.9 billion.

Demand since mid-July has clawed back more than half of that deficit. Cumulative flows stood at approximately $57.7 billion by late September, leaving the complex roughly $5 billion short of its previous high-water mark.

Analysts read the withdrawal as concentrated, not broad

Bloomberg Intelligence ETF analyst Eric Balchunas noted that the rebound was notable given the pressure the products had absorbed over the previous 11 months. Flows, he said, had returned to levels reminiscent of their earlier strength even as Bitcoin contended with higher yields and lingering negative sentiment. The recovery, Balchunas added, had made the bearish case harder to sustain as price continued grinding higher.

The structure of the Sept. 30 outflow supports a narrow rather than systemic reading. The withdrawal was concentrated almost entirely in Fidelity's fund, while nine of the twelve products registered no net movement at all. A single large issuer's redemption does not, on its own, establish a broader rotation out of the asset class.

That makes the coming sessions the more consequential signal. A sustained run of redemptions spread across BlackRock, Fidelity and other large issuers would indicate the recovery is losing momentum. Renewed inflows, by contrast, would frame Tuesday's move as a pause after more than $3 billion of buying over the prior two weeks.

Bitcoin traded around $83,800 early on Oct. 1, leaving ETF demand as one of the clearest available gauges of whether institutional buyers continue adding exposure near current levels.

The math ahead

The next milestone is straightforward. The funds need approximately $5 billion in additional cumulative inflows to erase the drawdown from the October 2025 peak and set a new record. Whether they close that gap in the coming weeks will depend on how quickly buyers return after September's final-session reversal — and on whether the redemption pressure that defined the first half of 2026 stays contained to isolated sessions rather than resuming as a broad trend.