BREAKING
U.S. spot Bitcoin ETFs opened September in the red, logging approximately $236.5M in net outflows on September 1 — the largest single-day withdrawal since July 31, according to data from the Onchain Lens Terminal. The data was published on September 2, 2026, with a caveat that only 3 of 13 eligible funds had reported at the time of the tally, meaning the final figure could shift.
IBIT Dominates the Outflow Picture
BlackRock’s IBIT was responsible for $201.2M of the total — representing approximately 85.1% of all reported net outflows for the session. That concentration in a single fund is notable: with just three funds reporting, IBIT alone accounted for the overwhelming share of the day’s redemptions.
Fidelity’s FBTC contributed roughly $43.67M in additional outflows, while Bitwise’s BITB was the only fund to record meaningful positive flows on the day, pulling in approximately $8.38M in net inflows. The remaining 10 funds had not yet reported when the initial data was published.
Fund-Level Breakdown
| Fund | Net Flow (Sept. 1) | Share of Total Outflow |
|---|---|---|
| BlackRock IBIT | -$201.2M | 85.1% |
| Fidelity FBTC | -$43.67M | 18.5% |
| Bitwise BITB | +$8.38M | — (inflow) |
| Remaining 10 funds | Not yet reported | — |
| Total (partial) | -$236.5M | 3 of 13 funds |
Source: Onchain Lens Terminal. Data partial — 10 of 13 funds had not yet reported.
Market Context
The outflow session coincided with broad selling pressure in Bitcoin markets. At the time of writing, BTC is trading at $76,516, down 2.04% over the past 24 hours, with a market cap of approximately $1.537 trillion and 24-hour volume of $28.87B. Reports noted that Bitcoin had slipped below the $77,500 level as macro-driven risk-off sentiment weighed on demand. This reversal followed a period of prior-session inflows, underscoring how quickly institutional flow direction can shift under macro pressure.
As covered in our analysis of weekly ETF flows where BTC commanded a 70.8% share of $2.71B in net inflows, Bitcoin ETFs have been a consistent destination for institutional capital — making single-day outflows of this magnitude a notable inflection point worth monitoring.
The macro backdrop has also been flagged by institutional research. As noted in our coverage of Grayscale’s analysis linking $40T U.S. debt to Bitcoin’s debasement trade thesis, longer-term structural demand arguments remain intact even as short-term flows turn negative.
What the Numbers Show
- The $236.5M figure is a partial read — with 10 funds still unreported, the final daily total may be higher or lower.
- IBIT’s 85.1% concentration of reported outflows is the dominant story: when the largest Bitcoin ETF by AUM reverses, it moves the headline number decisively.
- BITB’s $8.38M inflow shows demand was not entirely absent — at least one fund attracted buyers on the down day.
- This is noted as the largest daily Bitcoin ETF outflow since July 31, marking a meaningful reset in September’s flow trajectory.
Source: Onchainlens · Published by CoinsProbe Markets Desk