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Nikkei 225 explained: Japan's index and its link to the yen

The Nikkei 225 trades while New York sleeps. It opens in the US evening, closes before Europe wakes, and keeps one eye on the yen the whole time.

Market guide · 6-minute read · Updated 2026-10-21

At a glance

Tokyo trades 9:00 – 11:30 am and 12:30 – 3:30 pm local time, with a lunch break in between. The afternoon close moved from 3:00 pm to 3:30 pm in November 2024.

Why share price matters

Like the Dow, the Nikkei 225 is price-weighted. A company with a high share price can move it far more than a bigger company with a low share price.

Nikkei applies adjustments and caps so a single stock can't dominate completely. Even so, a few high-priced members carry a lot of the index's moves.

What moves it

• The yen. Many members are exporters. A weaker yen makes their overseas sales worth more in yen, so the Nikkei often rises when the yen falls. See USD/JPY.
• The Bank of Japan. The BoJ sets Japan's interest rates. Its decisions land during the Tokyo day, which is the US night. Rate changes can move both the yen and the index sharply.
• Wall Street overnight. Tokyo opens a few hours after New York closes, so it often starts by reacting to the US session.
• Global demand. Cars, electronics, chips and machinery make up much of the index. Demand from the US and China matters.

When it's busiest

• The Tokyo open (8:00 pm ET in US summer): the first hour is usually the most active.
• The lunch break: trading in the cash market pauses for an hour.
• The close (2:30 am ET in US summer): activity picks up into the final auction.

The daylight-saving catch: Japan doesn't change its clocks. When the US switches, Tokyo's hours move by an hour in ET terms. Futures on the Nikkei trade in long day and night sessions, so the chart can move outside these hours too. Our market hours tool shows today's times.

Its personality

• A mirror of the yen. On many days, the Nikkei and USD/JPY move together: weaker yen, higher index.
• Gaps from the US. Big moves on Wall Street often show up as a gap at the Tokyo open.
• Price-weight quirks. A few high-priced stocks can push it more than the economy news suggests.
• Overnight for US traders. Trading it live means staying up late or using alerts. That's a real cost to your sleep and focus.

Reading it with our method

Start on the daily chart. Mark the last places price turned around. Decide: higher highs and higher lows, or lower ones?

On your smaller chart, trade only in that direction. A level only breaks when a candle body closes past it. The Tokyo open often pokes through levels and snaps back.

Set the stop from the chart, then size from the stop. Futures traders should check the current contract specs on the exchange site before doing the math. ETF traders can use the position size calculator.

Common mistakes

• Ignoring the yen. A big move in USD/JPY can drag the index with it.
• Forgetting the lunch break. The cash market stops for an hour, then can restart with a jump.
• Using last year's ET times. Japan doesn't do daylight saving, so the ET times change twice a year.
• Trading it tired. Its live hours are the US night. A tired trade is usually a worse trade.

Questions