What it is
Pre-market trading refers to the hours preceding the regular trading session on major stock exchanges, typically from 4:00 AM to 9:30 AM Eastern Time. During this period, electronic communication networks (ECNs) facilitate trades, allowing institutional and retail investors to react to news, earnings reports, or other market-moving events released overnight or early in the morning. Trading volumes and liquidity are generally lower than during regular hours.
Significant news, such as quarterly earnings announcements, merger and acquisition reports, or economic data, often breaks during pre-market hours. Investors use this window to place trades based on these developments before the broader market opens. Due to lower liquidity, prices can be more volatile and bid-ask spreads wider, meaning trades might execute at less favorable prices than during regular market hours, especially for less-liquid stocks.
Why it matters
Pre-market trading allows you to react to breaking news before the main market opens, but be aware of lower liquidity and increased price volatility. It can set the tone for the day's trading.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice