[US Stocks to Trade 23 Hours a Day Starting December 6th: Nasdaq to Trade 23 Hours a Day] According to Jinse Finance, since its inception in 1971, Nasdaq's regular trading hours have long been from 9:30 AM to 4:00 PM Eastern Time. While pre-market and after-hours trading have been available for many years, the core trading framework has remained unchanged for over forty years. This December, this pattern will undergo a major change—Nasdaq will officially launch a "23/5" trading system on December 6th, with only a one-hour break window each day, and continuous trading for the remaining 23 hours.