Japan: NIKKEI trading psychology

The Tokyo Stock Exchange trades in two sessions, 9:00am to 11:30am and 12:30pm to 3:00pm JST, with a real lunch break between them, a built-in pause most other major markets simply don't have.

What tends to move it: Exporters (autos, electronics) and technology names carry heavy index weight, making the NIKKEI unusually sensitive to yen strength, since a weaker yen typically boosts overseas earnings for Japan's largest exporters.

1. Trading through the pause instead of using it. The midday break is a rare, built-in opportunity to step back and review a position with a clear head before the afternoon session, and it's routinely wasted by traders anxiously watching for the reopen instead of actually reassessing whether the morning's trade still fits the plan.
2. Missing the yen correlation. A significant NIKKEI move on a quiet domestic news day is often a currency story, yen weakness lifting exporter earnings expectations, rather than anything company-specific.
3. Assuming low retail participation means low volatility. Japan has historically had lower retail equity participation than markets like the US or South Korea, but that doesn't mean lower volatility, institutional and foreign flows can still move the index sharply.
4. Ignoring Bank of Japan policy shifts. BoJ policy changes, especially around yield curve control, have produced some of the sharper moves in Japanese markets in recent years, and treating them as a minor domestic story misses their real impact.
5. Trading the afternoon session the same way as the morning. Volume and character can differ meaningfully between the two sessions, and applying morning-session assumptions to the afternoon session without adjustment is a common miscalibration.

• Use the midday break deliberately, reassess open positions against your plan rather than just waiting for the reopen.
• Check USD/JPY before attributing a NIKKEI move purely to domestic company news, especially for exporters.
• Track BoJ meeting dates the same way you'd track any other major central bank event.