Twenty-three-hour trading sessions for U.S. equities are the subject of a Seeking Alpha community consultation, with the platform soliciting perspectives on what such a structural shift would deliver and what it would cost. No position has been staked; the initiative is framed as a weighing of potential advantages against potential disadvantages.
The gap that 23-hour sessions would address is a global-market reality. Capital does not stop moving when U.S. exchanges close. Overnight, monetary policy decisions out of Asia and Europe, commodity price moves, and geopolitical developments of all kinds continue to alter the fundamental picture underlying U.S. equities. The instruments available to react during those hours, chiefly futures and overseas-listed proxies, are structurally different from primary cash equity markets. A 23-hour session would narrow the window between when events occur and when primary market prices can reflect them.
What extended hours could deliver
Retail access is the most direct benefit proponents would cite. Participants whose working hours overlap with current market hours have limited ability to trade in a live primary session, relying instead on pre-market and after-hours venues that typically carry lower liquidity. A 23-hour session would replace those secondary windows with the primary market for most of the day. A second argument centers on information efficiency: earnings releases and macro data that land outside the current open force a gap between when a price-relevant event occurs and when cash equities can formally price it. A longer session compresses that gap.
The liquidity trade-off
The counterargument runs on liquidity arithmetic. Session hours and trading depth are not the same variable. Extending hours does not create capital; it distributes existing volume across more time. Thin late-night hours may produce worse execution than current after-hours venues deliver, concentrating costs on exactly the retail participants the extension is intended to help. Behind that is a practical question of market infrastructure: settlement cycles, clearing systems, and margin timelines are calibrated to existing session boundaries, and rebuilding them around a near-continuous session is a material undertaking.
Seeking Alpha has not indicated a preferred outcome. The platform is gathering perspectives across the spectrum before any conclusion is reached.