Idemitsu Kosan Hits Day High with Strong 6.39% Intraday Surge

Idemitsu Kosan Co., Ltd., a prominent player in the oil industry, has experienced a notable surge in its stock price, gaining 6.39% on May 29, 2026. The stock reached an intraday high of JPY 1,398.50, reflecting a strong performance compared to the Japan Nikkei 225, which rose by 2.53% on the same day. Over the past week, Idemitsu Kosan has shown a 4.99% increase, slightly outperforming the Nikkei's 4.72% rise. However, its one-month performance of 3.75% lags behind the Nikkei's 10.7% gain. Despite a robust annual return of 59.81%, the company has underperformed relative to the Nikkei 225's impressive 72.58% return over the same period. Idemitsu Kosan maintains a market capitalization of JPY 1,802,313 million and is recognized as a net-debt-free entity. However, it faces challenges with a decline in net sales and a significant drop in pre-tax profit. The company's return on equity stands at 3.78%, and it has a price-to-earnings ratio of 30.00, indicating a cautious outlook amidst its recent stock performance.