U.S.-listed spot Bitcoin ETFs recorded $450.4 million in net outflows on September 15, reversing the previous session’s return to positive flows. The withdrawal was the category’s largest single-day outflow since June 25, when the funds tracked by Farside Investors lost a combined $691.7 million. Bitcoin also fell sharply during a session marked by regulatory and broader macroeconomic uncertainty.
According to Farside Investors’ Bitcoin ETF flow data, Fidelity’s FBTC led the withdrawals with $214.8 million, followed by BlackRock’s IBIT with $161.7 million. Grayscale’s GBTC lost another $44.1 million, ARK 21Shares’ ARKB recorded $17.4 million in outflows and Bitwise’s BITB shed $12.4 million. No other tracked fund reported a positive flow, bringing the combined daily total to exactly $450.4 million.
Bitcoin ETF Flows Reverse Sharply
The move represented a rapid reversal from September 14. Spot Bitcoin ETFs had attracted $159.9 million just one trading session earlier, led by $134.3 million entering IBIT and $53.3 million flowing into FBTC. The September 15 redemptions therefore produced a net swing of $610.3 million between the two sessions.
The scale of the withdrawal was also notable in historical context. September 15 produced the heaviest daily redemption since June 25, when Farside recorded $691.7 million leaving the category. June 26 subsequently saw another $444.5 million outflow, slightly below Tuesday’s total, while no later session before September 15 exceeded the latest withdrawal.
Bitcoin weakened alongside the ETF reversal. Reuters reported that BTC fell about 4% to roughly $75,908 following the Senate’s failure to advance major crypto market-structure legislation, while Coinbase and Circle shares also declined. The broader market was simultaneously contending with oil above $100, rising Treasury yields and expectations for a Federal Reserve rate increase.
CLARITY Vote Adds to Market Uncertainty
The regulatory development came when the Senate rejected cloture on the motion to proceed to H.R. 3633, the Digital Asset Market Clarity Act. The procedural motion received 49 votes in favor and 50 against, below the three-fifths threshold needed to advance, according to the official Senate record. The result stalled immediate consideration of the bill rather than constituting a final vote on its passage.
The timing makes the legislative setback relevant to the day’s market backdrop, but the ETF data does not identify why individual investors redeemed shares. The flows cannot establish whether withdrawals were directly prompted by the Senate vote, macroeconomic conditions, portfolio rebalancing or a combination of factors.
The clearest signal is therefore the magnitude of the reversal itself. A $450.4 million daily outflow erased nearly three times the previous session’s net inflow, with redemptions concentrated in the two largest positive contributors from September 14. The next flow sessions will show whether September 15 marked another short-lived reversal or the beginning of a more sustained withdrawal cycle.
