US stock market to operate nearly 24 hours from December 2026

The US stock market is set to extend its operating hours significantly with the introduction of an overnight trading session beginning December 6, 2026. The new session will run from 9 p.m. to 4 a.m., making American equities available for trading nearly 23 hours per day across five business days weekly.

The extended hours represent a major shift in market accessibility, particularly for international investors who have previously been constrained by time zone differences. Investors based outside the United States have often found themselves unable to trade during standard US market hours due to geographical separation, limiting their participation in the world's largest equity market.

With overnight trading now available, global market participants will have greater flexibility to execute trades when it suits their local business hours. The phased introduction of round-the-clock trading reflects broader efforts by US market regulators and exchanges to maintain competitiveness in an increasingly globalized financial landscape.

The overnight session will operate alongside existing regular market hours, creating an extended trading window that accommodates investors across multiple continents. This development could reshape trading patterns and liquidity distribution throughout the 24-hour cycle.