The reason the Nikkei 225 index fell 2.12% on October 30, 2026 - closing at 63,290 yen

On Friday, October 30, 2026, the Nikkei 225 average closed at 63,290.11 yen in the Tokyo Stock Exchange, down 1,369.36 yen (2.12%) from the previous trading day . This marked the first decline in four trading days, with the index falling to 62,711.42 yen during the morning session. The market was weighed down by the decline in US technology stocks the previous day, as well as selling in Japanese semiconductor and electronic component stocks due to concerns about whether massive investments in AI (artificial intelligence) would translate into profits. However, the entire 2.12% decline cannot be explained by a single news story.

Nikkei 225 closing price and price movement on October 30th

The figures can be confirmed in the Nikkei's index data. The closing price on the previous trading day, the 29th, was 64,659.47 yen. On the 30th, selling pressure dominated from the opening, and after hitting the day's low at 10:53 (Tokyo, Japan Standard Time), the stock price narrowed its losses somewhat before closing.

This is the closing price on October 30th , not the current real-time price. Regular trading of spot stocks on the Tokyo Stock Exchange ended at 3:30 PM (JST, UTC+09:00) on the same day. This corresponds to 6:30 AM (UTC) on the same day in Coordinated Universal Time. Japan does not observe daylight saving time. Historical figures for the Nikkei 225 can be found in Nikkei's daily summary and historical data for October 30, 2026 .

Why did it fall by 2.12%?

The decline in US tech stocks and concerns about AI investments are having repercussions.

Before the Tokyo market opened on October 30, technology stocks had fallen in regular trading in the US on October 29. Furthermore, it was reported that the earnings reports released by Amazon and Intel after the close of trading on the 29th (US time) caused their stock prices to fall in after-hours trading, which also weighed on Japanese investor sentiment. Concerns about capital investment in AI and the profitability of related businesses are thought to have influenced the evaluation of semiconductor-related stocks in the Tokyo market.

The order of events is important. The closing bell in the Tokyo market on October 30th is explained by information on regular and after-hours trading in the U.S. on the 29th, which was known up to that point, and not by the results of regular U.S. trading on the 30th, which began after the close of trading in Tokyo . The events of that day, including the views of market participants, can also be found in Reuters' Tokyo market report dated October 30th .

High-priced semiconductor-related stocks dragged down the index.

The Nikkei 225 is not simply weighted by market capitalization, but is based on stock prices. Therefore, if stocks with a large impact on the index plummet, the overall decline tends to appear larger. Reuters reported that on that day, Advantest fell by approximately 5.9%, Tokyo Electron by approximately 5.2%, Ibiden by approximately 15.2%, Lasertec by approximately 8.8%, and SoftBank Group by approximately 6%. These stock movements are concrete examples of how concerns about the AI ​​and semiconductor sectors have spilled over into the Tokyo market.

However, even if you add up the declines of individual stocks, it will not equal a 2.12% drop in the Nikkei average. The actual contribution varies depending on the index's weighting and calculation method. You need to refer to the Nikkei index overview, calculation method , and daily summary to distinguish between the number of declining stocks and their contribution to the index.

Was the Bank of Japan's policy decision the main cause?

On the same day, October 30, the Bank of Japan (BOJ) announced at its Monetary Policy Meeting that it would keep its target for short-term interest rates at around 1.25% and revise the pace at which it would sell its ETFs (exchange-traded funds). While these are important pieces of information related to Japanese stocks, the sharp decline that day had already begun before the BOJ's announcement. Reuters reported that the market reaction to the interest rate freeze and the ETF selling policy was relatively limited. It would not be appropriate to consider the BOJ's decision alone as the direct cause of the 2.12% decline. The details of the announcement can be found in the BOJ's 2026 Monetary Policy Meeting document .

Does the sharp drop in the Nikkei average signify a broad decline in Japanese stocks as a whole?

In conclusion, this is not necessarily the case. The TOPIX (Tokyo Stock Price Index) closed at 3,965.07 points on the same day, down 38.21 points (0.95%) from the previous trading day . The difference in the magnitude of the decline compared to the Nikkei 225's 2.12% drop indicates that the index composition and the impact of individual stocks were important factors. The final value of the TOPIX can be checked in the index data from the Japan Exchange Group (JPX) .

According to Nikkei's report, of the 225 stocks listed on the 30th, 105 rose and 120 fell. While there were more declining stocks, not all stocks fell in value. Some domestic demand and entertainment-related companies saw buying interest due to positive earnings reports. Therefore, the fact that "the Nikkei average fell by more than 2%" should be interpreted separately from the judgment that "the overall evaluation of Japanese companies has uniformly deteriorated."

What should I check in the next transaction?

When reviewing the market close on the 30th, it's more useful to check whether the decline was concentrated in specific sectors rather than trying to predict price movements on the next trading day. The order of checking is as follows:

• Index Comparison: Will the difference in decline rates between the Nikkei 225 and TOPIX narrow? If the difference is large, we will continue to monitor the impact of stocks with a high weighting in the index.
• Major semiconductor stocks: Are there any new developments in the price movements of Advantest, Tokyo Electron, and other companies, as well as in corporate earnings reports and capital investment forecasts?
• Time difference with the US market: The next thing to check about US stock price movements is whether the information comes after the closing price of the Tokyo market on the 30th has been finalized or not.
• Monetary policy and exchange rates: Track the Bank of Japan's published data and the movement of the yen exchange rate, and avoid confusing the day's price movements with subsequent developments.

What is confirmed for October 30th is that the Nikkei 225 closed at 63,290.11 yen, down 2.12% from the previous trading day. The most prominent factor behind this was selling in AI and semiconductor-related stocks, and the Bank of Japan's decision was another important factor on the day. Since this does not provide definitive information on future trends, we will evaluate it by comparing the final index value, the contribution of individual stocks, and the timing of news events.