US-listed spot Bitcoin exchange-traded funds posted their biggest one-day outflow since June on Wednesday, as investors withdrew nearly $490 million from the products while Bitcoin (BTC) slid to $82,000. The redemptions erased all of the gains the funds had built up in early October and turned the month's flows negative.

Largest one-day outflow since late June

Data from SoSoValue showed a single-day net outflow of $487 million, the funds' largest daily redemption since June 25, when they shed $691.7 million in a single session.

Net flow tallies reflect the difference between creations and redemptions of fund shares each session, which is why the daily prints are widely treated as a running gauge of traditional-market demand for Bitcoin exposure — and why a session of this size can flip a month's totals on its own.

Various sources estimated the single-day outflow at roughly 2.1 standard deviations below the 90-day average daily flow, which stands at an inflow of about $92 million. In a standard distribution, values lie within two standard deviations in 95 percent of cases, a benchmark that Wednesday's session fell well outside.

For a sense of how much sentiment has shifted, reports show that back in March, the biggest one-day outflow over a three-week span was $171.12 million, at a time when Bitcoin traded close to $70,000.

BlackRock's IBIT led the redemptions

The selling was concentrated in the largest fund. BlackRock's iShares Bitcoin Trust (IBIT) recorded $207.7 million in outflows, accounting for roughly 43% of all the funds redeemed on the day.

Fidelity's FBTC lost $105.1 million, while ARK 21Shares' ARKB shed $101.7 million, for a combined $206.8 million in outflows. Grayscale's GBTC recorded $39.3 million in redemptions, and Bitwise's BITB lost $27.6 million.

The swing came abruptly. Just one session earlier, the funds had taken in $118.8 million, including $122 million flowing into IBIT. Earlier in the week, Bitfinex analysts pointed out that ETF inflows had already fallen about 90% from the prior week, and said fresh spot buying would be necessary to mount a new attempt at $90,000.

October's early gains vanished in a day

Through four trading sessions in October, the ETFs had already attracted $321.6 million in net inflows: $102.7 million on Oct. 1, $189.9 million on Oct. 2, an outflow of $89.8 million on Oct. 5, and an inflow of $118.8 million on Oct. 6. Wednesday's outflow wiped out most of that total, leaving the month at a negative $163.3 million as of Oct. 7. CoinDesk's estimate for October showed a similar outflow of $165.6 million.

That leaves year-to-date net inflows at just $717 million, a thin cushion considering that cumulative net flows had dropped to a negative $5.76 billion in July. Since the funds launched in January 2024, they have managed a net inflow of $57.33 billion.

Bitcoin tests the floor that has held since September

Bitcoin's price dropped by more than 3% over the last 24 hours, with BTC changing hands at an average price of $80,642 at the time of press. The decline followed closes of $85,771 on October 5, $85,540 on October 6, and $83,282 on October 7, marking a test of the price floor that has held since the rally lost traction on September 21.

Glassnode offered a more tempered take, suggesting that combined spot-exchange and ETF volume has averaged about $6.8 billion a day over seven days, lighter than nine out of ten periods since January 2024. The analytics firm located the closest liquidation zone between $81,700 and $83,300, precisely where Bitcoin is trading currently, with a block of Binance spot bids sitting at $81,000 and $81,250. Those markers — the $81,700–$83,300 liquidation zone and the $81,000–$81,250 bid block — are the reference levels traders will be measuring against as the next round of daily flow data lands.

Ether funds are bleeding too

The pullback was not limited to Bitcoin. US spot Ether ETFs, which began trading in July 2024, logged another $160.9 million in outflows on Oct. 7, marking the seventh consecutive day of declines beginning Sept. 29. BlackRock's ETHA saw $116.1 million leave the fund, while Grayscale's ETHE recorded $25.8 million in outflows. Ether ETFs have lost around $568.8 million in total across the seven negative sessions.

One indicator moved in the opposite direction Santiment recorded a net withdrawal of 24,073 BTC from exchanges on Oct. 5, the highest one-day outflow in seven months, reducing exchange reserves to just below 6.5% of the total supply. The firm views this as a positive development, since fewer coins are available to sell, although it notes that outflows alone do not guarantee price increases.