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What Is After-Hours Trading?

Steven Levine, Founder of TickerPosts and OpenClassActions.com1 min readLast reviewed

After-hours trading is trading that happens after the regular U.S. stock-market session closes. Many brokers also offer premarket trading before the regular open. These extended sessions can be useful, but they are not the same as the main trading day.

Why stocks move after hours

Companies often release earnings after the 4:00 PM ET regular close. Other news can also arrive outside market hours, including guidance updates, analyst actions, regulatory decisions, product announcements, or merger news.

When that happens, buyers and sellers may react in the after-hours session instead of waiting until the next morning.

Why after-hours prices can be jumpy

Extended-hours sessions often have less trading volume than the regular session. Fewer participants can mean wider bid-ask spreads and sharper price moves from smaller orders.

That matters because the displayed price may not represent the same depth of demand you would see during regular hours. A stock can appear to move dramatically after hours, then settle differently by the next regular open.

What beginners should check

Before reacting to an after-hours move, ask:

  • What news caused the move?
  • Was the move on heavy or light volume?
  • Is the bid-ask spread wide?
  • Did the company file anything with the SEC?
  • Does the move change the long-term business case, or only the next headline?

After-hours trading can provide information, but it can also amplify emotion. Treat it as an early signal to research, not as a final answer.

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