Session Overlap

A session overlap is the window when two of the three major trading sessions are open simultaneously — most notably the London/New York overlap (roughly 12:00–16:00 GMT), which is the single most liquid and volatile period of the forex trading day. More active market participants means tighter spreads but often sharper, faster price moves. Many day traders deliberately schedule their most active trading hours around this overlap to get the best combination of liquidity and movement.