US spot Bitcoin ETFs recorded about $643.33 million in net outflows on October 30, their largest daily withdrawal since late June and roughly 0.7 percent of the funds’ $98.14 billion in assets. That single session erased about $440.8 million of inflows from the prior four trading days and left the October 26 to 30 week with about $202.4 million in net outflows.
Most of the selling was concentrated in the largest products. BlackRock’s iShares Bitcoin Trust lost around $233 million to $234 million, Fidelity’s FBTC lost around $201 million, and Ark 21Shares’ ARKB lost about $129 million to $130 million, while GBTC and BITB saw smaller outflows. Ether ETFs lost about $155 million to $156 million at the same time, and Solana products saw smaller redemptions, which pointed to broad risk-off behavior across major crypto ETFs. The move was large for one day, but it remained a small slice of total ETF assets and came within a longer trend of strong net inflows since launch.
The flow reversal came one day after hackers drained roughly $6.3 billion from Binance hot wallets across multiple blockchains. Analytics firms and the FBI described the incident as the largest crypto exchange hack to date and linked it to North Korea’s TraderTraitor group. Binance said users’ balances were intact and that it had set aside more than $6.34 billion in company funds, replenishing about 90 percent of the stolen assets through its corporate treasury, futures insurance reserves and Secure Asset Fund for Users.
Bitcoin ETF investors were not directly exposed to the hack because ETF coins are custodied separately. Even so, the incident raised awareness of centralized exchange and infrastructure risk at a time when crypto is being integrated more deeply into traditional finance. The combination of a record-sized breach and heavy headline risk appears to have nudged some ETF holders to reduce risk, although flow data alone cannot prove individual motivations.
Several overlapping factors will show whether this outflow is a one-off shock or the start of a longer de-risking phase. Daily net flows into the major Bitcoin ETFs will be important, because a quick return of inflows would suggest investors see the hack as an isolated venue problem rather than a structural threat to Bitcoin exposure through ETFs. Binance’s progress on fully backing affected tokens, reopening withdrawals and publishing updated proof-of-reserves will also matter, since those steps help anchor confidence in exchange-based liquidity. Regulators and policymakers are already citing the hack in debates over crypto oversight and custody standards, so new guidance or rules could reshape how institutions allocate to ETFs versus holding coins directly.
A record-scale hack at Binance coincided with the largest Bitcoin ETF outflows in months, showing how security events can quickly flip institutional sentiment from steady accumulation to risk reduction. The damage to long-term Bitcoin adoption appears limited so far, but persistence or repetition of such incidents could push more capital into regulated wrappers like ETFs and drive tougher custody standards across the industry. Watching ETF flows, Binance’s recovery steps and regulatory reactions will show whether this episode becomes a brief scare or a turning point for crypto market structure. Confidence in the figures is high because multiple independent data providers report similar ETF flow and hack numbers.
