U.S. spot Bitcoin ETFs ended a nine-session inflow streak on September 30 with $148.7 million in net redemptions, closing the third quarter on a weaker note after attracting billions of dollars during the preceding two weeks. The reversal was driven primarily by Fidelity’s FBTC, which lost $125.6 million in a single session. According to Farside Investors, BlackRock’s IBIT recorded another $9.5 million in outflows and Bitwise’s BITB lost $13.6 million.
The negative session followed nine consecutive trading days of net creations from September 17 through September 29. Those nine sessions brought approximately $3.08 billion into U.S. spot Bitcoin ETFs before the September 30 reversal. The run included a $999 million inflow on September 21, the category’s strongest daily result of 2026.
Fidelity Leads the September 30 Reversal
FBTC accounted for roughly 84% of the day’s aggregate withdrawal, while IBIT and BITB supplied the remaining net redemptions reported by Farside. Other tracked funds finished unchanged. The concentration means the $148.7 million headline was not the result of broad withdrawals across every U.S. spot Bitcoin product. Farside’s finalized data place cumulative net inflows across the category at approximately $57.56 billion since launch.
Ether products moved in the same direction. U.S. spot Ether ETFs posted $59.6 million in net outflows on September 30, led by $26.6 million leaving Fidelity’s FETH and $25.5 million leaving Grayscale’s Ethereum Mini Trust. The simultaneous Bitcoin and Ether redemptions put both major U.S. spot crypto ETF categories in negative territory for the final session of the quarter.
The Bitcoin reversal also fits the volatility seen earlier in September. The funds lost $282.7 million on September 10 during a four-session withdrawal run before flows eventually reversed. September therefore contained both substantial redemption periods and some of the strongest creation days of the year, underscoring how quickly daily ETF demand can change.
Q3 Still Ends With $6.34B of Net Inflows
Despite the final-session withdrawal, SoSoValue data place third-quarter Bitcoin ETF net inflows at approximately $6.34 billion. July contributed about $172 million, August $3.52 billion and September another $2.65 billion. The quarter therefore reversed roughly $5 billion of net outflows recorded during Q2 and became the strongest quarter for the funds so far in 2026.
SoSoValue’s September 30 snapshot put total net assets at approximately $107.98 billion, equal to about 6.42% of Bitcoin’s market capitalization, with cumulative net inflows of $57.495 billion. Those figures differ slightly from Farside’s cumulative total because the two trackers use different reporting and update methodologies, so the datasets should be treated as separate snapshots rather than combined into a single series.
The late-September inflow streak unfolded against a changing macro backdrop, including stronger U.S. growth data and higher Treasury yields that had shifted expectations for additional Federal Reserve tightening. ETF flows can respond to portfolio rebalancing, arbitrage and changing risk allocation, so they should not automatically be described as institutional buying or tied to one macro catalyst.
The next measurable milestone is whether September 30 proves to be an isolated redemption day or the beginning of a longer outflow sequence. A second consecutive negative session would turn the one-day reversal into a developing trend, while renewed inflows would leave the nine-day run as the dominant late-September signal.