US spot Bitcoin ETFs just lost $1.28 billion in a single week, the worst stretch since June, flipping their 2026 flows negative. Bitcoin's price, however, barely flinched, a split every holder should understand before reading too much into either number.
What actually happened
US Bitcoin ETFs saw $1.28 billion in net outflows last week, the heaviest weekly drawdown since June and enough to push cumulative 2026 flows into negative territory, according to The Block. BlackRock's IBIT, the industry's largest fund, accounted for 98% of Friday's outflows alone, with $403 million leaving that single product. Separately, a wallet funded through Tornado Cash converted 3,100 ETH into roughly 6.92 million USDC before opening a $26 million Bitcoin long paired with an Ether short on Hyperliquid, per The Defiant. As of this morning, Bitcoin traded at $75,798, down -0.14% over 24 hours, with a 24-hour range of $75,541 to $75,968. Trading volume over the period was $10.46 billion, against a market capitalisation of $1.52 trillion.
How we got here
US Bitcoin ETFs had run positive for most of 2026, with steady inflows helping anchor institutional demand through the year. That streak ended last week, when redemptions accelerated sharply enough to erase the full-year gain in flows. IBIT's outsized share of the outflow matters because it has been the primary vehicle institutions use to gain Bitcoin exposure, so concentrated selling there tends to dominate the broader fund picture. The week also brought a separate Bitcoin development: on 29 October 2026, developer Paul Sztorc launched eCash, a hard fork of Bitcoin's codebase built around his long-pursued Drivechains design, giving holders who controlled their keys at block 973,728 an equivalent ECX balance.
Why this matters for you
For ETF holders, the shift to negative 2026 flows signals that institutional money is, on balance, net selling the wrapper this year, even though spot price has stayed roughly flat. That gap suggests other buyers, possibly long-term holders or non-ETF demand, are absorbing the selling pressure without moving price much. For self-custody holders, the eCash fork adds a separate task: anyone who held BTC at the snapshot block now holds ECX too, but moving BTC before separating the two carries a replay risk on unprotected transactions. Builders watching Drivechains should note five sidechains already launched, with two more planned.
The bigger question
If institutional ETF flows keep falling while spot price holds steady, does that mean ETFs no longer set the marginal price of Bitcoin, or simply that this week was too small a sample to tell?
What to watch
Weekly US ETF flow data remains the next checkpoint for whether the 2026 negative trend deepens or reverses. On the eCash side, two additional sidechains, Photon and CoinShift, are still due to launch, and wider exchange listings for ECX are expected as liquidity develops. Bonuz will track both threads as they develop.
This article is information, not financial advice. Prices are a snapshot and change constantly. Nothing here is a recommendation to buy or sell any asset. Do your own research.
