FX Trading Sessions and the Liquidity Clock

The foreign exchange market trades 24 hours a day across time zones, but that does not mean liquidity is constant. It is concentrated in three overlapping regional sessions — Tokyo (roughly 00:00–09:00 UTC), London (08:00–17:00 UTC), and New York (13:00–22:00 UTC) — and each brings a different mix of participants: Asian corporates and central banks in Tokyo, the bulk of global spot volume in London, and U.S. real-money and macro flow in New York.

The busiest, tightest-spread window of the trading day is the London/New York overlap, roughly 13:00–17:00 UTC, when both major centres are active simultaneously. Outside all three sessions — late in the New York afternoon before Tokyo opens — liquidity thins out, spreads widen, and even modest orders can move prices more than usual.

Worked example

A EURUSD order that costs 0.1 pip of spread during the London/New York overlap might cost 0.3–0.5 pips placed during the New York-to-Tokyo gap, simply because far fewer market makers are actively quoting. A trading desk that needs to execute a large order with minimal market impact will typically schedule it inside the overlap window rather than at the session's edges, even if the underlying trading signal doesn't care what time it is.