Idemitsu Kosan Hits Day High with Strong 3.54% Intraday Surge

Idemitsu Kosan Co., a prominent player in the oil industry, has seen a notable increase in its stock price, gaining 3.54% on October 27, 2025. The stock reached an intraday high of JPY 1,088.00, reflecting a strong performance compared to the Japan Nikkei 225, which rose by 1.35% on the same day.
Over the past week, Idemitsu Kosan has demonstrated a robust performance with an 8.14% increase, significantly outpacing the Nikkei's 3.61% rise. However, its one-year performance remains subdued, with a return of just 3.12%, contrasting sharply with the Nikkei's impressive 29.25% gain.

The company maintains a market capitalization of JPY 1,302,924 million and exhibits a price-to-earnings ratio of 8.00. Despite facing challenges, including a high debt-to-equity ratio of 0.65 and a decline in profits over the past year, Idemitsu Kosan's management efficiency is highlighted by a return on capital employed (ROCE) of 5.90%. The stock's valuation remains attractive, trading at a premium compared to its peers.