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– The overlap concentrates liquidity, US data releases and the bulk of daily range completion
– Trade the reaction to the release, not the release itself
– Sessions need an end time as much as they need a start time
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Foreign exchange trades continuously, which creates a temptation to trade continuously. In practice, opportunity is heavily concentrated. The window when London and New York are both fully staffed — approximately 12:00 to 16:00 GMT, shifting by an hour around daylight saving changes — accounts for a disproportionate share of daily range and almost all of the meaningful US data flow.
Why the overlap behaves differently
Depth of book is at its best, so large orders can be executed without excessive slippage and price discovery is genuine rather than mechanical. Spreads are at their tightest, which materially changes the economics of short-term trading. And because both major centres are present, moves that begin in one are validated or rejected by the other rather than drifting in a vacuum.
Structuring the session
Before the open. Mark the Asian session range and the London morning range on the pairs you trade. Note every scheduled release in the window and its consensus. Decide in advance which levels you care about and what would have to happen for you to act.
The first thirty minutes. Positioning adjustments dominate and false breaks are common. Many experienced traders simply observe. If you do act, the London range extremes are more meaningful reference points than anything drawn from the overnight session.
Around a release. The initial spike is frequently reversed within minutes as the full detail is digested. Trading the second move — after the market has decided what the number means — offers worse prices and considerably better odds. Spreads widen sharply in the seconds around a release; an order placed then may fill nowhere near your intended level.
The final hour. European desks close and liquidity thins measurably. Trends that were clean can stall or reverse on flow rather than information. This is a poor window to initiate and a reasonable one to reduce.
Which instruments
EUR/USD, GBP/USD and USD/CAD are most responsive in this window, as is gold. Yen crosses are active but reflect Asian positioning that is being unwound rather than fresh conviction. Pairs without a US or European leg are usually better traded in their own session.
The discipline that matters most
Define when you stop. A session with a fixed end time prevents the most common failure pattern in short-term trading: a reasonable morning followed by increasingly poor decisions made in deteriorating liquidity while trying to recover a loss. The market will be there tomorrow at the same time, with the same structure and better conditions.
Check the day’s schedule on the economic calendar and session times on our market hours page.