Japan’s Nikkei Plummets as Middle East Tensions Escalate

Tokyo, Japan – Japan’s Nikkei 225 index experienced a significant downturn on Monday, March 23, 2026, as escalating tensions in the Middle East fueled risk aversion among investors. The decline follows threats exchanged between the United States and Iran regarding the Strait of Hormuz, a critical waterway for global energy supplies.

Market Performance

The Nikkei 225 fell as much as 5% to 50,688.76, while the broader Topix index slumped as much as 4.5% to 3,447.34, nearing a technical correction. This sell-off comes after a public holiday in Japan on Friday, meaning the market is now reacting to global benchmarks.

Within the Topix, electronics and banking sectors contributed most to the declines. Chip-related firms, including Renesas Electronics and Lasertec, were among the worst performers on the Nikkei.

Oil Prices and Inflation Concerns

Skyrocketing oil prices are contributing to the negative market sentiment. Brent crude was trading around $111 per barrel as of 10 a.m. In Tokyo according to CNBC, sapping risk appetite across various sectors.

“Whatever happens now, what has grow crystal clear is the outlook for near term inflation,” said Amir Anvarzadeh, Japan equity strategist at Asymmetric Advisors, in a note. The 48-hour ultimatum issued by President Donald Trump for Iran to reopen the Strait of Hormuz has “notched up the temperature,” increasing the likelihood of conflict escalation.

Anvarzadeh anticipates that “overvalued” AI-related stocks, such as cablemaker Fujikura, will be particularly vulnerable to inflation fears. Fujikura experienced a decline of as much as 6.7% on Monday.

Bond Yields and Market Caution

Rising bond yields are further amplifying caution in the equity market. Japan’s 10-year bond yield rose six basis points to 2.32% on Monday, reaching its highest level since 1999.

“The market sees this as a ‘bad’ rise in yields,” explained Kazuyuki Muramatsu, head of investment management at Nagomi Capital, suggesting it’s a negative factor even for bank shares, which typically benefit from higher yields.

Broader Implications

The potential disruption to oil flows through the Strait of Hormuz could have significant global economic consequences. The International Energy Agency (IEA) has warned that the current supply disruption of 11 million barrels per day is larger than the combined impact of the two major oil crises of the 1970s as reported by the BBC. Fatih Birol, Executive Director of the IEA, stated that no country will be immune to the energy consequences of this crisis.

Looking Ahead

The situation remains highly volatile, and market reactions will likely continue to be sensitive to developments in the Middle East. Investors are closely monitoring the diplomatic efforts to de-escalate the conflict and ensure the continued flow of energy supplies through the Strait of Hormuz.