Trading Sessions & Market Hours

Introduction

Exchanges don't run nonstop. They open and close in defined sessions, with auctions at the edges and limited after-hours trading. This lesson explains the rhythm of the trading day.

Regular Trading Hours

Each exchange has defined regular trading hours. For example, the NYSE and NASDAQ generally trade 9:30–16:00 ET, Monday to Friday on trading days. Other exchanges follow their own local schedules.

Time Zones Matter

Because exchanges are spread across time zones, global markets open at different moments:

Asia opens  ->  Europe opens  ->  US opens  ->  Asia again

This creates near-continuous global trading as one region hands off to the next.

Opening and Closing Auctions

Many exchanges use an auction at the open and the close:

• The opening auction matches orders to set the opening price
• The closing auction sets the official closing price

After-Hours and Pre-Market

Most brokers offer:

• Pre-market trading before the open
• After-hours trading after the close

Why Hours Matter

Markets are not liquid 24/7:

• Overnight, fewer participants = wider spreads
• Big news (earnings, macro data) often lands outside hours, so opening prices can gap
• Understanding sessions helps you avoid surprises

Real-World Example

A company reports earnings after the close. The next day's opening auction reflects the news, and the stock may open significantly higher or lower than the previous close — a "gap."

Summary

• Exchanges trade in defined regular sessions (e.g., 9:30–16:00 ET)
• Time zones stagger global markets across regions
• Opening/closing auctions set official prices
• Pre-market and after-hours exist but with lower liquidity
• News outside hours can cause price gaps at the open

Next Lesson

After you trade, the real handover: settlement.