According to Edward Dowd, the realized volatility factor fell 8.41% today, ranking among the three worst daily readings in the past decade and constituting a -3.5 sigma event, source: Edward Dowd on X, Oct 22, 2025. Dowd also noted SPX was down about 1% at the time, indicating market stress beneath the surface despite a modest headline move, source: Edward Dowd on X, Oct 22, 2025. For crypto traders, the IMF has reported that since 2020 Bitcoin has shown higher co-movement with U.S. equities, implying equity volatility shocks can spill over to BTC and ETH, source: IMF Blog, Crypto Prices Move More in Sync With Stocks, Jan 2022.