| 03/17/2026 16:00 |
Decision Taken to Invest in MidOcean Energy for Full-Scale Entry into the LNG Business |
| 03/16/2026 11:00 |
Notice Concerning Completion of Post-Adjustment for Accelerated Share Repurchase (ASR) |
| 03/13/2026 15:30 |
Notice Concerning the Postponement of the Announcement Schedule for the Next Medium-term Management Plan |
| 02/10/2026 15:30 |
Consolidated Financial Results [Japan GAAP] for the nine months ended December 31, 2025 |
| 02/10/2026 15:30 |
Presentation on Results for the 3rd Quarter FY2025 |
| 02/09/2026 13:00 |
[Delayed] Final Investment Decision and Construction Start for Large Pilot Facility for Solid Electrolytes (All-Solid-State Battery Material) |
| 12/24/2025 13:30 |
Mitsui Chemicals, Idemitsu Kosan, and Sumitomo Chemical Concluded a Definitive Agreement for the Business Integration |
| 12/19/2025 11:00 |
Idemitsu Kosan and Mitsui Chemicals Reach Final Agreement on Consolidating Chiba Ethylene Complexes to Optimize Production |
| 11/21/2025 17:30 |
Notice Concerning Change in Major Shareholders |
| 11/11/2025 15:30 |
Presentation on Results for the 2nd Quarter FY2025 |
| 11/11/2025 15:30 |
Consolidated Financial Results [Japan GAAP] for the six months ended September 30, 2025 |
| 11/11/2025 15:30 |
Announcement on Revisions to Consolidated Earnings Forecasts for the Fiscal Year Ending March 2026 |
| 11/11/2025 15:30 |
Announcement Regarding Acquisition and Retirement of Treasury Shares |
| 10/29/2025 11:30 |
Notice Regarding Results of Tender Offer for Shares of Fuji Oil Company, Ltd. and Change in the Subsidiary |
| 10/09/2025 14:00 |
One of the World's Largest Black Pellet Plants Starts Commercial Production |
| 09/19/2025 00:30 |
[Correction] Idemitsu ESG Data Book 2025 |
| 09/11/2025 16:00 |
Notice Regarding Commencement of Tender Offer for Shares of Fuji Oil Company, Ltd. (Securities Code 5017) |
| 09/10/2025 10:00 |
Mitsui Chemicals, Idemitsu Kosan, and Sumitomo Chemical Enter Into MOU |
| 08/30/2025 00:30 |
Idemitsu ESG Data Book 2025 |
| 08/30/2025 00:30 |
Idemitsu Integrated Report 2025 |
| 08/29/2025 18:30 |
Notice Regarding Receipt of Dividends from Consolidated Subsidiary |
| 08/08/2025 15:35 |
Presentation on Results for the 1st Quarter FY2025 |
| 08/08/2025 15:35 |
Consolidated Financial Results [Japan GAAP] for the three months ended June 30, 2025 |
| 06/19/2025 14:00 |
Entry into oil and gas field exploration and development blocks in Malaysia |
| 05/28/2025 08:00 |
Matters Subject to Measures for Electronic Provision upon Giving Notice of 110th Ordinary General Meeting of Shareholders |
| 05/28/2025 08:00 |
Notice of Convocation Annual General Meeting 2025 |
| 05/13/2025 15:30 |
Presentation on Results for FY2024 |
| 05/13/2025 15:30 |
Notice regarding change proposals of Representative Director, Directors and Auditors |
| 05/13/2025 15:30 |
Consolidated Financial Results [Japan GAAP] for the Fiscal Year Ended March 31, 2025 |
| 04/30/2025 15:30 |
Notice regarding conclusion of a loan agreement with financial covenants |
| 04/22/2025 17:00 |
[Delayed]Completed construction to increase capacity of Plant 1,small pilot facilities for mass production of solid electrolytes |
| 04/15/2025 15:30 |
Announcement on the Absorption-type Merger (Simple, Short Form Merger) with RS ENERGY K.K., a Wholly Owned Subsidiary |
| 04/11/2025 08:45 |
Notice Concerning Change in Major Shareholders |
