Market overlap in trading refers to a period when two major financial markets or trading sessions are open at the same time. In forex, the most important overlaps occur when sessions such as London, New York, and Tokyo operate simultaneously for a certain period. These overlapping hours are often closely watched because they can bring increased trading activity, liquidity, and price movement.

The London-New York overlap is generally considered one of the most active periods in the forex market. During this time, traders from European and North American markets are participating at the same time. The increased number of buyers and sellers can lead to higher trading volume and more frequent price movements, particularly in major currency pairs such as EUR/USD and GBP/USD.

Market overlap can create attractive conditions for traders because higher liquidity may result in tighter spreads and smoother trade execution. Increased participation can also produce stronger breakouts, clearer trends, and more opportunities for short-term trading strategies. However, greater activity does not automatically mean every trade will be profitable. Overlaps can also bring sharp volatility, especially when important economic reports or central-bank announcements are released.

Traders often combine session timing with technical analysis, support and resistance, price action, volume, and risk management to identify potential setups. It is also important to consider the specific asset being traded because different markets have different active periods.

Overall, market overlap represents a window of increased market participation. By understanding when major sessions overlap and how price behaviour changes during these periods, traders can better identify potentially favourable trading conditions while remaining aware of the additional volatility and risks involved.