| 1964-04 |
Established Fuji Petroleum through investments from Arabian Petroleum, Tokyo Electric Power (now Tokyo Electric Power Holdings), Sumitomo Chemical, Japan Mining (now ENEOS), and others |
| 1966-08 |
Joined the Japan Petroleum Group (now ENEOS) |
| 1968-10 |
Start of operation at Sodegaura Refinery (crude oil processing capacity: 70,000 barrels per day) |
| 1970-11 |
Start of operation at the second phase expansion of Sodegaura Refinery |
| 1974-10 |
Start of operation at the third phase expansion of Sodegaura Refinery |
| 1982-12 |
Completion of Nakazue Base |
| 1993-07 |
Start of operation of benzene and xylene production equipment |
| 1996-04 |
Sodegaura Refinery obtained ISO 9002 certification (international standard for quality assurance and quality management systems) |
| 1998-10 |
Enhanced crude oil processing capacity at Sodegaura Refinery (192,000 barrels per day) |
| 1999-03 |
Sodegaura Refinery obtained ISO 14001 certification (environment management system) |
| 2002-04 |
Sodegaura Refinery obtained ISO 9001 certification (quality management system) |
| 2002-04 |
Sodegaura Refinery obtained ISO 9001 (Quality Management System) certification |
| 2003-01 |
Fuji Petroleum and Arabian Petroleum jointly established a holding company, AOC Holdings, through a share transfer method: AOC Holdings common stock listed on the Tokyo Stock Exchange and Osaka Securities Exchange |
| 2003-01-28 |
Establishment date: January 31, 2003 |
| 2004-04 |
Delisted AOC Holdings common stock from the Osaka Securities Exchange |
| 2005-10 |
Started supplying petroleum products to Showa Shell Sekiyu (now Idemitsu Kosan) |
| 2006-06 |
Started supplying petroleum products to Japan Airlines International (now Japan Airlines) and Kyushu Petroleum (now ENEOS) |
| 2010-11 |
Reduced crude oil processing capacity at Sodegaura Refinery (140,000 barrels per day) |
| 2011-04 |
Enhanced crude oil processing capacity at Sodegaura Refinery (143,000 barrels per day) |
| 2013-10 |
Merged Fuji Petroleum into AOC Holdings, the surviving company, and renamed AOC Holdings to Fuji Petroleum: the new Fuji Petroleum established |
| 2024-04 |
Concluded a capital and business alliance agreement with Idemitsu Kosan |
| 2025-11 |
The tender offer for our shares by Idemitsu Kosan has been successful, and the company has become a subsidiary of Idemitsu Kosan |
| 2026-01 |
Delisting from the Tokyo Stock Exchange Prime Market |