Glossary
Premarket trading
Trading in US stocks before the 9:30 a.m. ET open, from as early as 4:00 a.m. on some venues, with thinner volume and wider spreads.
On this page
Premarket trading is the session in which US stocks change hands before the regular market opens at 9:30 a.m. Eastern Time. As of 2026, Nasdaq and NYSE Arca accept premarket trades from 4:00 a.m. ET, and other NYSE venues run an early session from 7:00 a.m. Brokers decide how much of that window their customers can use. It matters because company news, especially earnings, often lands before the open, and the premarket is where the first reaction shows up.
How it works
Orders are matched on exchanges and alternative trading systems just as during the day, but with far fewer participants. Most brokers accept only limit orders in the premarket, and many orders entered for the day session do not take part unless you mark them for extended hours.
What to watch for
- Thin liquidity. Wider spreads and shallow order books mean a modest order can move the price.
- Prices that do not hold. The premarket price is not the opening price. Moves frequently shrink or reverse once full volume arrives at 9:30.
- Volatility. News-driven swings are concentrated in fewer trades, so quotes can jump between levels.
- Stops. Stop orders typically do not trigger outside regular hours at many brokers, so a position can gap past a stop before it can act.
Overnight trading, from 9:00 p.m. to 4:00 a.m. ET, is planned by several venues but was not live on a primary exchange as of October 2026.