The Nikkei 225 index rose on Thursday, opening about 200 yen higher and later gaining more than 1,300 yen [1].

This movement reflects a volatile intersection of high-tech optimism and geopolitical tension. While semiconductor stocks are driving growth, instability in the Middle East is pushing energy costs higher, creating a complex environment for global investors.

Buying pressure was primarily led by semiconductor and AI-related stocks following a rise in U.S. tech indices on Wednesday [1, 3]. This tech-driven rally pushed Nikkei futures to a night session high of 72,210 yen before they closed at 71,850 yen [4].

Simultaneously, global oil futures rose by more than two USD per barrel [2]. Market analysts said this increase was due to a combination of geopolitical factors. Some reports indicate the rise followed an announcement from Iran regarding the closure of the Strait of Hormuz [2], while others point to comments from U.S. President Donald Trump (R-FL) regarding the Iran-U.S. memorandum.

Trump said the memorandum was “already over” [1]. This statement contributed to the sustained high prices in the oil futures market as investors braced for a shift in diplomatic relations.

Currency markets also showed significant movement during the session. The yen exchange rate was recorded at approximately 161.40 JPY per USD [4]. This valuation continues to influence the competitiveness of Japanese exports and the attractiveness of the Nikkei to foreign buyers.

Investors are now monitoring whether the momentum in high-tech stocks can offset the potential economic drag caused by rising energy costs, a balance that will likely dictate the index's trajectory in the coming weeks.

The Nikkei 225 index rose... later gaining more than 1,300 yen

The divergence between the surging tech sector and rising energy costs highlights a fragile market equilibrium. While AI-driven demand provides a strong tailwind for the Nikkei 225, the sensitivity of oil futures to U.S. political rhetoric and Iranian maritime activity introduces a systemic risk that could trigger sudden volatility in global trade and inflation.