Session Overlap Explained: Asia, London and New York
Learn what session overlap means in forex trading, why the London-New York overlap is significant, and how overlaps relate to liquidity.
- 7 min read
- For beginners
- Educational
- Lezione 2 di 5
Session overlap refers to the periods during the trading day when two major trading sessions are open at the same time. This guide explains the three major sessions, where they overlap, and why these overlap periods are often discussed in relation to liquidity.
This is general educational content about market structure, not a suggestion that trading during any specific overlap period leads to a particular outcome.
The Three Major Trading Sessions
The forex market is generally divided into three major sessions based on the working hours of key financial centers: the Asia-Pacific session (centered around cities such as Tokyo and Sydney), the London session (representing European trading hours), and the New York session (representing North American trading hours).
Each session has its own typical characteristics, often associated with increased activity in currency pairs relevant to that region.
Where Sessions Overlap
Because these sessions are based in different time zones, there are periods where two sessions are open simultaneously. The Asia-Pacific and London sessions have a brief overlap, as do the London and New York sessions, with the London-New York overlap generally considered the most significant due to the size and activity typically associated with both financial centers.
Why the London-New York Overlap Is Often Highlighted
During the London-New York overlap, market participants from both major regions are active simultaneously, which has historically been associated with higher trading volumes and increased liquidity compared to non-overlap periods. This is a commonly referenced pattern in educational material about forex market structure, though actual conditions on any given day can vary.
How Overlaps Relate to Liquidity and Trading Conditions
Higher liquidity during overlap periods is generally associated with tighter spreads and more continuous price movement, compared to quieter, single-session periods where liquidity may be lower and spreads potentially wider. This connects to concepts covered in the Understanding Trading Costs unit, where spread and liquidity were discussed in more detail.
Summary
Session overlap refers to periods when two major trading sessions are open simultaneously, with the London-New York overlap generally considered the most significant due to historical trading volume patterns. Understanding overlaps provides useful educational context for how liquidity and trading conditions can shift throughout the day.
Frequently Asked Questions
Three sessions are commonly referenced: Asia-Pacific, London, and New York.
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