The 11 U.S.-listed spot bitcoin exchange-traded funds (ETFs) collectively bled $869.86 million Thursday, registering their second-highest outflow on record, according to data source SoSoValue.Investors have pulled out $2.64 billion over three weeks, signaling growing caution and shifting sentiment in the market.STORY CONTINUES BELOW Don't miss another story. Subscribe to the Crypto Daybook Americas Newsletter today . See all newsletters Sign me up By signing up, you will receive emails about CoinDesk products and you agree to our terms of use and privacy policy .Thursday’s outflow coincided with Bitcoin’s fall below the key $100,000 support level and heightened risk aversion on Wall Street. Ether ETFs also registered an outflow of $259.72 million, the highest since Oct. 13.As of writing, bitcoin traded near $97,500, down over 5% in 24 hours and 11% on a month-to-date basis, according to data source CoinDesk.