On May 21, the Tokyo stock market experienced a significant rally, with the Nikkei 225 index rising by more than 2,200 points at one stage, driven by easing concerns over the Iran situation and increased investor confidence [1]. Market participants noted that prior worries about deteriorating U.S.-Iran relations had subsided following reports of diplomatic progress, which reduced risk-averse behavior and spurred buying, particularly in major stocks [1]. An analyst from a securities firm commented that the retreat of geopolitical risks was a key factor lifting the market, and suggested that buying momentum could continue in the short term [1]. Technical analysis indicated that the Nikkei 225 had broken through a recent resistance line, fueling expectations for further gains, with 22,500 points seen as the next psychological milestone and trading volume on the rise [1].
Asia-Pacific markets broadly opened higher as investors assessed ongoing U.S.-Iran diplomatic efforts aimed at a peace deal in the Middle East [2]. The Nikkei 225 advanced 1.36%, while the Topix gained 0.55% [2]. South Korea's Kospi rose 0.52% and the Kosdaq Index jumped over 3% [2]. Australia's S&P/ASX 200 increased by 0.5%, and Hong Kong's Hang Seng index futures traded at 25,568, above the previous close of 25,386.52, signaling bullish sentiment [2].
In the U.S., the Dow Jones Industrial Average closed at a record high of 50,285.66, up 276.31 points or 0.55%. The S&P 500 rose 0.17% to 7,445.72, and the Nasdaq Composite climbed 0.09% to 26,293.10 [2]. Oil prices fell in U.S. trading on hopes for a deal, but reports that Tehran would retain its enriched uranium stockpile complicated negotiations, as dismantling Iran's nuclear program remains a central U.S. demand [2]. However, oil had previously surged and stocks fell after President Donald Trump ordered a blockade of the Strait of Hormuz, escalating tensions following the collapse of weekend peace talks [2].
Japan's core inflation eased more than expected in April, coming in at 1.4% versus the 1.7% forecast and down from 1.8% in March, marking the lowest level since March 2022 [2]. This cooling inflation trend weakens the case for an early rate hike by the Bank of Japan, and investors are closely monitoring both the U.S.-Iran negotiations and their potential impact on global markets, especially oil prices and regional equities [2].
While technical indicators and easing geopolitical risks point to further upside, some market participants caution that sudden news or renewed risks could trigger sharp declines, leading to a mix of profit-taking and new buying [1]. The outlook for stock prices will depend on overseas political developments and upcoming domestic economic data releases [1].
CONCLUSION
The Nikkei 225 and other Asia-Pacific markets rallied on easing U.S.-Iran tensions and lower-than-expected Japanese inflation, boosting investor sentiment. While technical and geopolitical factors suggest further gains, market participants remain cautious about potential volatility from renewed risks or unexpected news. The trajectory of regional equities will hinge on diplomatic developments and key economic indicators in the coming weeks.