Nikkei Falls 396 Points as Ex-Dividend Drop and Rate Fears Weigh

The broader TOPIX fell 70.87 points, or 1.72%, to 4,041.13, underperforming the Nikkei as dividend adjustments and selling in value, financial, resource and cyclical shares weighed heavily on the wider market. The Growth Market 250 Index also declined, falling 6.73 points to 784.74.

The day’s headline decline was partly mechanical. September 29 was the ex-dividend date for many companies with September-end interim payouts, meaning share prices adjusted lower after investors who held through the previous session secured their dividend rights. Market participants estimated that the ex-dividend effect pushed the Nikkei down by about 380 yen.

That means the Nikkei’s actual underlying weakness was less severe than the headline point drop suggested. Even so, the market tone was poor. Prime Market breadth was sharply negative, with only 170 stocks rising against 1,318 declining, showing that the ex-dividend adjustment was accompanied by broad selling pressure.

The Nikkei opened lower at 65,558 after the dividend adjustment and briefly tested lower levels as investors reacted to weaker Wall Street trading, rising global yields and renewed caution toward risk assets. The index later recovered part of its early loss but remained negative through the session.

The market’s low was 64,699, showing that selling pressure was initially heavy. The Nikkei later recovered to close above 65,000, but the rebound lacked enough strength to turn positive.

The dollar-yen rate traded around 157.45 after the close, leaving the yen weak even after the Bank of Japan’s September 18 rate hike. The currency remained one of the most important supports for exporters, but also one of the biggest risks for households and imported inflation.

Nikkei CNBC-style market commentary would likely focus on the difference between the headline decline and the market’s underlying condition. The ex-dividend effect explains much of the index drop, but the weak breadth showed that investors were also reducing exposure across many sectors.

The TOPIX’s sharper decline was especially important. Because TOPIX is broader and more weighted toward financials, industrials and value shares, its 1.72% fall showed that the day’s selling went well beyond a few high-priced Nikkei components.

The previous session had already shown signs of fatigue. On September 28, the Nikkei briefly topped 67,000 but then reversed and finished at its intraday low. That failed breakout left investors cautious heading into the ex-dividend day.

The September 29 session extended that caution. The Nikkei held above 65,000, but the market did not show the breadth or conviction needed to suggest a clean return to the upward trend.

Dividend-related trading was the dominant local factor. Many investors bought high-dividend shares ahead of the September 28 rights deadline, especially banks, insurers, trading houses and other income-oriented names. Once the rights date passed, those stocks faced mechanical price adjustments and profit-taking.

Banks and insurers had been strong before the deadline because of both dividend demand and expectations for higher interest rates. On September 29, they were hit by the ex-dividend adjustment and by caution over whether the recent rally had priced in too much rate optimism.

The Bank of Japan raised its policy rate to 1.25% on September 18, the highest level in 31 years. The move supports the long-term earnings outlook for banks by improving lending margins and investment income, but the BOJ’s guidance was not aggressive enough to convince markets that a rapid tightening cycle is certain.

That has left financial shares in a complicated position. Higher rates are positive, but much of that story has already been bought. If bond yields rise too quickly, banks and insurers may also face valuation losses on their bond portfolios.

Securities and commodity futures shares were among the weakest industry groups, falling more than 4%. The sector had benefited from strong market activity and higher equity levels, but September 29’s broad selloff and ex-dividend adjustment weighed on sentiment.

Oil and coal product shares were the weakest industry group, dropping more than 4%. That reflected renewed volatility in energy prices and profit-taking after recent strength. The sector is highly sensitive to crude oil movements, Middle East risk and the yen.

Steel shares also fell sharply, adding to the pressure on TOPIX. The weakness in steel reflected selling in cyclical and resource-related shares at a time when global rates remain high and investors are reassessing the outlook for demand.

Electric machinery was the only industry group in positive territory, showing that investors still favored selected technology, semiconductor and electronic-component shares even as the broader market weakened.

That split was visible in individual stocks. AI-related and semiconductor names were mixed, but some parts of the technology complex continued to attract buying. SCREEN Holdings, Disco, Murata Manufacturing and Taiyo Yuden were among shares that drew attention, while parts of the broader AI trade remained under pressure.

The market is no longer treating the AI theme as a single block. Investors are separating companies with strong earnings visibility from those exposed to valuation risk, funding pressure, power-supply bottlenecks or slowing expectations for AI-related investment.

Advantest and Tokyo Electron remain the most important semiconductor-related names for the Nikkei because of their large index influence and direct exposure to AI chip investment. Their movements continue to determine much of the benchmark’s short-term direction.

Kioxia Holdings also remains a key barometer for memory-sector confidence. The company is tied to high-bandwidth memory, AI servers and data-center storage demand, but its share price has remained volatile as investors wait for clearer signals from global memory demand and U.S. chip earnings.

Micron Technology’s earnings, due later in the week, remain an important overseas event for Tokyo’s memory and semiconductor shares. A strong outlook could support Kioxia and related names, while any disappointment could revive selling in Japan’s chip complex.

SoftBank Group also remains central to the Nikkei. The company is Tokyo’s most visible proxy for global AI investment through its exposure to OpenAI, Arm, robotics and digital infrastructure. Its performance is especially important because of its large weighting in the price-weighted Nikkei.

SoftBank’s broader AI strategy remains attractive to investors when sentiment is strong, but the stock is also sensitive to funding costs, large-scale capital needs and concerns about whether AI investment will produce returns quickly enough.

Fujikura, Furukawa Electric and Sumitomo Electric remain important second-wave AI infrastructure names. Their exposure to optical fiber, cables, high-speed networks and data-center infrastructure keeps them tied to the physical buildout required by artificial intelligence.

The September 29 session showed that technology support alone cannot fully offset broad ex-dividend and macro selling. The Nikkei’s decline was smaller than TOPIX’s because some high-impact technology names held up better, but the broader market was clearly weak.

The yen remained a major support and risk. Around 157 to the dollar, the currency is weak enough to help exporters by increasing the yen value of overseas earnings. That supports automakers, machinery makers, electronics companies and precision-equipment manufacturers.

At the same time, the weak yen raises costs for imported food, energy, raw materials and consumer goods. That keeps pressure on households and import-dependent companies, especially while oil prices remain high by historical standards.

The BOJ’s September rate hike has not produced a sustained yen recovery. Investors still see a wide interest-rate gap between Japan and the United States, especially after the Federal Reserve raised rates and signaled that further tightening remains possible.

That gap keeps the dollar supported and limits the yen’s ability to strengthen. It also means Japanese authorities remain under pressure to watch currency markets closely.

Markets remain alert to possible intervention if the yen weakens quickly toward 160. Japanese officials have repeatedly said they are focused on excessive moves rather than specific levels, but the combination of a weak yen, high oil and household inflation keeps currency policy near the center of the market.

Japanese government bond yields are another key risk. The 10-year JGB yield has recently moved above 3% and remains near levels not seen since 1996. High yields change the investment environment for equities, banks, insurers, mortgages, corporate borrowing and public finances.

Higher yields can help banks and insurers, but they also raise the discount rate applied to future corporate earnings. That is especially important for growth stocks, AI-related names and smaller companies.

The 40-year bond auction on September 29 was one of the day’s scheduled domestic events, keeping attention on the super-long end of the JGB curve. Investors remain sensitive to any sign that demand for long-dated Japanese government bonds is weakening.

A fragile bond market would be negative for equities. If yields rise too quickly, investors may reduce exposure to high-valuation shares, and the government’s debt-servicing burden could become a larger market concern.

Prime Minister Sanae Takaichi’s government is trying to support households, expand defense spending and fund long-term strategic investment while rates are rising. That is a difficult combination.

The government’s growth strategy calls for large-scale public and private investment through fiscal 2040 in semiconductors, artificial intelligence, energy security, defense, shipbuilding, robotics, space and other strategic sectors.

Those priorities support many of the companies investors continue to favor, including chip-equipment makers, advanced materials firms, optical-network companies, power-system suppliers, data-center infrastructure providers and defense-related manufacturers.

However, higher interest rates make fiscal discipline more important. Investors want evidence that Japan can fund household relief and industrial policy without undermining confidence in public finances.

The global backdrop also weighed on sentiment. U.S. stocks fell as investors reacted to high yields, persistent inflation risk and rising oil prices. Elevated global bond yields are now testing equity valuations across markets.

For Tokyo, U.S. yields matter through several channels. They affect the dollar-yen exchange rate, global growth-stock valuations and foreign investor appetite for Japanese equities.

If U.S. yields remain high, the dollar may stay firm and the yen may remain weak. That supports exporters but also keeps imported inflation pressure alive.

Oil prices are another key global risk. Higher crude prices can quickly flow into Japanese gasoline, electricity, aviation fuel, shipping, logistics, chemicals and manufacturing costs.

Japan imports most of its energy, so oil prices affect the trade balance, corporate margins and household budgets. A weaker yen amplifies the impact.

For households, the market story remains tied to prices. Wage growth has improved, but consumers continue to face high costs for groceries, fuel, electricity, transport and services.

A weaker yen and higher oil could erode the benefit of wage increases. That is why markets are watching whether the BOJ can contain inflation without damaging growth.

Companies face the same pressure from another direction. They must decide how much of higher wages, energy costs, logistics expenses, raw-material prices and borrowing costs can be passed on to customers.

Firms with pricing power, stable demand, strong brands or exposure to long-term investment remain better positioned. Companies without pricing power face margin pressure if consumers resist further price increases.

Retailers and importers remain vulnerable to yen weakness, while exporters remain supported. That divide is likely to keep sector rotation active in the coming sessions.

The ex-dividend effect also complicates interpretation of the September 29 move. The headline drop overstated the degree of selling in the Nikkei, but the weak breadth and TOPIX decline showed that the market was not simply adjusting mechanically.

Investors will now watch whether buyers return after the dividend adjustment. If the market stabilizes quickly, the September 29 decline may be treated as a technical dividend-related move. If selling continues, the failed September 28 breakout above 67,000 may be seen as a short-term peak.

The Nikkei’s technical position remains mixed. The index stayed above 65,000, but it remains below the 66,000 area that had become an important support level after last week’s rally.

A move back above 66,000 would improve sentiment and suggest that the dividend adjustment has been absorbed. A break below 65,000 would raise concern that the rebound from mid-September is losing momentum.

TOPIX’s position is more concerning. Its fall to 4,041 erased much of the recent dividend-driven strength and showed that broader participation remains fragile.

A healthy market would need support from financials, exporters, trading houses, industrials, domestic-demand shares and AI-related names. On September 29, the market was too narrow, with only selected electric machinery and technology names resisting the decline.

Small and mid-cap growth shares also remained weak. The Growth Market 250 Index fell for another session, reflecting the pressure from higher yields and cautious investor sentiment.

The weakness in growth shares shows that risk appetite remains limited outside the largest AI and semiconductor names. Investors are still demanding stronger earnings visibility before buying smaller growth companies.

Individual stock moves also reflected a cautious market. Orchestra Holdings, Happinet and Asahi Yukizai were among the top Prime Market gainers, while Nexon, Transvia and meito were among the largest decliners. Several lower-liquidity names also hit stop-high or stop-low levels.

The market schedule now turns to U.S. economic data and corporate events. Investors will watch U.S. housing data, job openings and consumer confidence for clues on whether the Federal Reserve may continue tightening.

The U.S. employment report later in the week will be especially important. Strong labor data could push U.S. yields higher and support the dollar, putting renewed pressure on the yen and global equities. Weaker data could ease yield pressure but may also raise questions about growth.

OpenAI’s annual developer event and Micron Technology’s earnings are also important for the AI trade. Any new AI infrastructure, computing or memory demand signals could affect SoftBank, Kioxia, Tokyo Electron, Advantest, Fujikura and other Japanese technology names.

South Korean semiconductor shares remain another key signal. Overseas investors increasingly treat Japanese chip-equipment makers, South Korean memory producers, Taiwanese foundries and U.S. AI shares as one connected trade.

If Korean memory shares recover, Japanese semiconductor and AI-related names may stabilize. If Seoul weakens, Tokyo’s chip complex could face further pressure.

What to watch next: whether the Nikkei can reclaim 66,000 after closing at 65,481, whether TOPIX can stabilize above 4,000, and whether buyers return after the ex-dividend adjustment.

Investors will monitor Advantest, Tokyo Electron, SoftBank Group, Kioxia, SCREEN Holdings, Disco, Fujikura, Furukawa Electric, Murata Manufacturing, TDK and Taiyo Yuden for signs of whether the AI trade can regain momentum.

Banks and insurers will also remain important. Mitsubishi UFJ, Sumitomo Mitsui, Mizuho, Resona, Tokio Marine and other financials will show whether higher-rate expectations can support value shares after the dividend adjustment.

The yen near 157 to the dollar remains the most important domestic signal. Further weakness toward 160 would support exporters but revive inflation and intervention concerns. A rebound toward 153 would ease import costs but pressure exporters and carry trades.

JGB yields are the second key signal. A stable bond market would help equities, while another rise in 10-year or super-long yields would pressure valuations and fiscal policy.

Oil prices are the third signal. Lower crude would help households and companies, while a renewed surge would intensify pressure on the trade balance and inflation outlook.

September 29 showed that Tokyo’s market remains fragile after the strong late-September rebound. The ex-dividend adjustment explains much of the Nikkei’s decline, but the broader weakness in TOPIX and the poor market breadth showed that investors are still cautious. The next test is whether buyers return once the dividend effect passes, or whether high yields, yen weakness and global rate fears push the market into a deeper pullback.