Bitcoin trades nonstop, but a decade of data shows its volatility increasingly follows Wall Street’s clock.

A recent study found that the nine hours from 13:00 to 21:59 UTC accounted for 50.6% of Bitcoin’s daily realized variance between 2022 and 2025, up from 38.4% in 2016-2018. Those hours represent just 37.5% of a full day, suggesting price discovery has become increasingly concentrated while Bitcoin itself continues trading around the clock.

The research, based on 87,672 hourly observations from Kraken’s XBT/USD market between 2016 and 2025, found the shift extends beyond higher activity during American business hours. Bitcoin’s volatility peak now moves when New York changes its clocks and fades when the New York Stock…