US spot Bitcoin exchange-traded funds (ETFs) recorded more than $1 billion in net outflows over three trading days, but crypto asset manager Bitwise says the withdrawals do not signal a lasting retreat by institutional investors.Investors pulled another $116 million from the funds on Tuesday, bringing net outflows since Friday to $1.16 billion, according to SoSoValue data.“I do think it’s related to a short-term risk-off environment rather than a structural change in institutional sentiment,” Bitwise’s head of research, André Dragosch, told Cointelegraph.The withdrawals followed Binance’s $6.3 billion hack on Thursday, which raised concerns about investor confidence and ETF custody security.Dragosch attributed the outflows to weaker market sentiment rather than fears over the safety of ETF holdings.Institutions are holding onDragosch said ETF flows reflect both long-term institutional adoption and shorter-term changes in investor sentiment.He cited a recent Bitwise survey of 15 institutions, none of which had reduced their Bitcoin ETF exposure during the bear market. US regulatory filings also showed that most institutional investor categories, apart from hedge funds, had largely maintained their positions.Related: Bitcoin ETF inflows leave institutional demand unclear: CoinSharesRetail investors still account for the majority of Bitcoin ETF holdings and tend to react more strongly to market volatility, according to Dragosch.Bitwise’s analysis found that ETF inflows are closely tracked broader crypto market sentiment, which weakened around the Binance hack, he said.Outflows slow as Bitcoin sentiment improvesTuesday’s $116 million in outflows marked a slowdown from Monday’s $399 million and Friday’s $643 million, extending the funds’ withdrawal streak to three trading sessions.The Crypto Fear & Greed Index rose to 34 from 26 on Monday, though it remained in the “Fear” category. Bitcoin gained about 1.6% over the past 24 hours, to trade near $78,000 at publication, according to CoinGecko.The latest withdrawals brought the funds’ net outflows for 2026 to approximately $153 million.Related: Binance traces $6.3B hack to fake job interviews, compromised AI toolBinance hack raises questions about ETF custodyThe Binance hack has raised concerns among some industry observers about crypto ETFs custody, particularly because major funds rely on a small number of custodians.Dragosch pointed to differences between the security arrangements used by crypto exchanges and institutional custodians, noting that the Binance incident affected hot wallets, which are connected to the internet, rather than cold wallets.“In contrast, institutional funds held at Coinbase custody are custodied in cold storage which, by definition, are not connected to the internet,” Dragosch said.Magazine: Wall Street killed Bitcoin’s wild rallies: 10x’s Markus Thielen