What it means
The London FX session opens 08:00 UTC; New York opens 13:00 UTC; London closes 17:00 UTC; NY closes 22:00 UTC. The 4-hour overlap from 13:00-17:00 UTC concentrates the largest desks on both sides of the Atlantic simultaneously. Daily FX volume peaks during this window — EUR/USD trades roughly 4x its 24-hour average volume per minute during overlap.
Why it matters
Spread, slippage and execution quality are all at their best during overlap. A strategy executed at 14:00 UTC on EUR/USD pays ~0.2 pip spread; the same strategy at 03:00 UTC pays ~1.0 pip — a 5x cost difference for the same trade. For active strategies, overlap timing is one of the highest-leverage adjustments you can make.
How to use it
Time scalping and high-frequency strategies to execute during overlap. For position trades on majors, prefer entries/exits during overlap to minimise slippage. Avoid Asian-session entries on G7 pairs unless your strategy specifically targets the Asian-session range.
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