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| Sakata Natural Gas Co., Ltd. | ||||||||
| Keiyo Pipeline Co., Ltd. | ||||||||
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| Capital City CCS | ||||||||
| INPEX Alpha Petroleum | ||||||||
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| INPEX Cash Maple Pty Ltd | ||||||||
| INPEX Conson | ||||||||
| INPEX FINANCIAL SERVICES SINGAPORE PTE. LTD. | ||||||||
| INPEX GeoThermal Sarulla | ||||||||
| INPEX Geothermal Development | ||||||||
| INPEX Holdings Australia Pty Ltd | ||||||||
| INPEX Japan Petroleum Development | ||||||||
| INPEX North Caspian Oil | ||||||||
| INPEX Norway | ||||||||
| INPEX Oil & Gas Australia Pty Ltd | ||||||||
| INPEX South Caspian Oil | ||||||||
| INPEX South Makkasar | ||||||||
| INPEX South Sulawesi | ||||||||
| INPEX Telnite | ||||||||
| INPEX Yamashin Oki Development | ||||||||
| Telnite | ||||||||
| edco Geopower Sarulla | ||||||||
| ジャパン石油開発株式会社 | ||||||||
| 株式会社INPEXアルファ石油 | ||||||||
| INPEX Business Services Inc. | ||||||||
| 株式会社INPEX西豪州ブラウズ石油 | ||||||||
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| INPEX DLNGPL PTY Ltd | ||||||||
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| INPEX Europe Limited | ||||||||
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| INPEX Idemitsu Norge AS | ||||||||
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| JODCO Lower Zakum Limited | ||||||||
| JODCO Onshore Limited | ||||||||
| MI Berau B.V. | ||||||||
| PT Medco Geopower Sarulla | ||||||||
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| Potentia Energy Pty. Ltd | ||||||||
| ブラウズ石油株式会社 | ||||||||
| 株式会社INPEXサウル石油 | ||||||||
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Established Imperial Oil Co., Ltd. (Showa 16) to unify the oil mining divisions of various companies, as a semi-public semi-private national policy company based on the Imperial Oil Co., Ltd. Law.
Established as a semi-governmental national policy company based on the Imperial Oil Company Act to unify the oil and gas division of various companies
Teikoku Oil Co., Ltd. is founded as a semi-government company to unify the existing Japanese oil exploration companies at the time.
The Imperial Oil Co., Ltd. was established. It was founded as a semi-governmental national policy company based on the Imperial Oil Company Act to unify the oil mining divisions of various companies.
Reorganized as a private company
Becomes a private company.
(Showa 25) Reorganized as a private company.
Reorganized as a private company (Showa 25).
Teikoku Oil Co., Ltd. Becomes a private company.
Started development of water-soluble gas in the South Kanto Gas Field (Narutō Gas Field)
Begins water-soluble gas development at the Minami Kanto Gas Field (Naruto Gas Field).
Begins water-soluble gas development at the Minami Kanto Gas Field (Naruto Gas Field).
Started development of water-soluble gas in the Minami Kanto Gas Field (Narutō Gas Field) (Showa 35).
Completed Japan's first long-distance high-pressure natural gas pipeline (Tokyo Line) between Niigata and Tokyo
Completes Japan's first long-distance natural gas pipeline between Tokyo and Niigata Prefecture (Tokyo Line).
Completes Japan's first long-distance natural gas pipeline between Tokyo and Niigata Prefecture (Tokyo Line).
Completed Japan's first long-distance high-pressure natural gas pipeline (Tokyo Line) between Niigata and Tokyo (Showa 37).
Established North Sumatra Marine Oil and Gas Resources Development Co., Ltd., the predecessor of International Petroleum Development Co., Ltd.
North Sumatra Offshore Petroleum Exploration Co., Ltd. (precursor to INPEX CORPORATION) is founded as a company promoting the independent development of overseas oil resources in accordance with a contract signed with PERMINA (now PERTAMINA).
Established North Sumatra Marine Oil Resources Development Co., Ltd., the predecessor of International Petroleum Development Co., Ltd. (Showa 41).
Changed company name to Indonesia Petroleum Resources Co., Ltd.
(Showa 42) Changed company name to Indonesia Petroleum Resources Development Co., Ltd.
Changed company name to Indonesia Oil Resources Development Co., Ltd. (Showa 42).
Discovery of Ataka oil field off Mahakam, Indonesia.
Discovers the Attaka Field in the Offshore Mahakam Block in Indonesia.
(Showa 45) Discovered Ataka Oil Field off Mahakam, Indonesia.
Discovered Ataka Oil Field off Mahakam, Indonesia (Showa 45).
Establishment of Japan Petroleum Development Co., Ltd. (JODCO).
Acquired interests in the ADMA block (oil production project) in the United Arab Emirates.
Japan Oil Development Co., Ltd. (JODCO) is founded.
Acquires interests in the ADMA Block located offshore Abu Dhabi in the UAE.
Japan Oil Development Co., Ltd. (JODCO) is founded. Acquires interests in the ADMA Block located offshore Abu Dhabi in the UAE.
(Showa 48) Japan Oil Development Co., Ltd. (JODCO) established. Acquired interests in the ADMA Block (oil production project) in the United Arab Emirates.
Established Japan Petroleum Development Co., Ltd. (JODCO) and acquired interests in the ADMA block in the United Arab Emirates (Showa 48).
Changed company name to Indonesia Oil Co., Ltd.
(Showa 50) The Japanese company name was changed to Indonesian Petroleum Co., Ltd. (The English company name was changed in 1977 (Showa 52)).
Its Japanese corporate name is changed in 1975.
Changed the Japanese company name to Indonesia Oil Co., Ltd. (Showa 50) (English company name changed in 1977).
Changes its corporate name to Indonesia Petroleum, Ltd.(Its Japanese corporate name is changed in 1975).
The English company name was changed in 1977 (Showa 52).
Changes its corporate name to Indonesia Petroleum, Ltd.(Its Japanese corporate name is changed in 1975).
Changes its corporate name to Indonesia Petroleum, Ltd. (Its Japanese corporate name is changed in 1975).
(The English company name was changed in 1977 (Showa 52)).
Discovered one of Japan's largest gas fields, Minami Nagao Gas Field (Niigata Prefecture).
Discovers the Minami Nagaoka Gas Field containing Japan's largest natural gas reserves in Niigata Prefecture.
Discovered one of Japan's largest South Nagaoka Gas Fields (Niigata Prefecture) (Showa 54).
Koshirahara Plant completed and production started at Minami Nagao Gas Field.
Begins production at the Minami Nagaoka Gas Field following completion of the Koshijihara Gas Plant.
(Showa 59) Koshijiwara Plant was completed, and production began at Minami-Nagaoka Gas Field.
Completed Koshiji Hara Plant and started production at the South Nagaoka Gas Field (Showa 59).
Parentzawa Plant completed.
Completes the Oyazawa Gas Plant.
Completed Oyazawa Plant (Heisei 6).
Acquired interests in the Kazakhstan North Caspian Sea offshore block, Australia WA-285-P block, and Indonesia Maseara block.
Acquires interests in the Offshore North Caspian Block in Kazakhstan; Permit WA 285-P offshore Australia; and the Masela Block offshore Indonesia.
(Heisei 10) Acquired interests in Kazakhstan North Caspian offshore mining block, Australia WA-285-P mining block, and Indonesia Maseara mining block.
Acquired interests in the North Caspian Sea offshore mining block in Kazakhstan, WA-285-P block in Australia, and Maserra block in Indonesia (Heisei 10).
Discovered Kashagan oil field, Ixis Gas Condensate Field, and Abadi Gas Field.
Discovers the Kashagan Oil Field in Kazakhstan and the Ichthys and Abadi gas fields in the Timor Sea.
(Heisei 12) Discovered Kashagan Oil Field, Ixis Gas Condensate Field, and Abadi Gas Field.
Discovery of Kashagan Oil Field, Ishis Gas Condensate Field, and Abadigas Field (Heisei 12)
Changed company name to International Petroleum Development Co., Ltd.
Changes its corporate name to INPEX CORPORATION.
(Heisei 13) Changed company name to International Petroleum Development Co., Ltd.
Changed company name to Japan Petroleum Exploration Co., Ltd. (Heisei 13)
Merged with Japan Petroleum Development Co., Ltd. (JODCO).
Listed on the First Section of the Tokyo Stock Exchange.
Acquires Japan Oil Development Co., Ltd. (JODCO).
Listed on the First Section of the Tokyo Stock Exchange.
Acquires Japan Oil Development Co., Ltd. (JODCO). Listed on the First Section of the Tokyo Stock Exchange.
(Heisei 16) Merged with Japan Petroleum Development Co., Ltd. (JODCO) and listed on the First Section of the Tokyo Stock Exchange.
Merged with Japan Oil Development Co., Ltd. (JODCO), listed on the First Section of the Tokyo Stock Exchange (Heisei 16)
Commenced production at the Azeri Oil Field in the Caspian Sea, Azerbaijan.
Production starts at the ACG Oil Fields in Azerbaijan.
(Heisei 17) Started production at Azerbaijan Caspian ACG Oil Field.
Start of production at Azeri Oil Field in the Caspian Sea ACG Block, Azerbaijan (Heisei 17)
Established a joint holding company, International Petroleum Development Teikoku Oil Holdings Co., Ltd., by International Petroleum Development Co., Ltd. and Teikoku Oil Co., Ltd.
INPEX and Teikoku Oil integrate their management and establish a joint holding company, INPEX Holdings, Inc.
(Heisei 18) Established a joint holding company, International Petroleum Development Teikoku Petroleum Holdings Co., Ltd., by International Petroleum Development Co., Ltd. and Teikoku Oil Co., Ltd.
Established a joint holding company, Japan Petroleum Exploration and Teikoku Oil, called "Japan Petroleum Exploration Teikoku Holdings Co., Ltd." (Heisei 18)
A joint holding company, "International Petroleum Development Teikoku Oil Holdings Co., Ltd.", was established by International Petroleum Development Co., Ltd. and Imperial Oil Co., Ltd.
International Oil Development Imperial Oil Co., Ltd. founded
Merged into International Petroleum Development Teikoku Oil Co., Ltd., with headquarters relocated to Akasaka, Tokyo.
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings.
The company headquarters are moved to Akasaka, Tokyo.
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings. The company headquarters are moved to Akasaka, Tokyo.
(Heisei 20) The company International Petroleum Development Teikoku Petroleum Co., Ltd. was established through the merger of International Petroleum Development Co., Ltd., International Petroleum Development Teikoku Petroleum Holdings Co., Ltd., and Teikoku Oil Co., Ltd., with headquarters relocated to Akasaka, Tokyo.
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings; headquarters moved to Akasaka, Tokyo.
INPEX CORPORATION is founded. INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings. The company headquarters are moved to Akasaka, Tokyo.
INPEX CORPORATION is founded.
Establishment of Japan Petroleum Exploration Teikoku (Heisei 20). Merger of Japan Petroleum Exploration Teikoku Holdings, Japan Petroleum Exploration, and Teikoku Oil, with headquarters relocated to Akasaka, Tokyo (Heisei 20)
The International Petroleum Development Teikoku Oil Co., Ltd. was launched. It was formed by the merger of International Petroleum Development Teikoku Oil Holdings Co., Ltd., International Petroleum Development Co., Ltd., and Imperial Oil Co., Ltd., with its headquarters relocated to Akasaka, Tokyo.
Final investment decision for the Australia Ixis LNG Project.
Reaches a Final Investment Decision (FID) on the Ichthys LNG Project in Australia.
(Heisei 24) Final investment decision for the Australia Ixis LNG Project.
Final investment decision for the Australia Ishis LNG Project (Heisei 24)
Completion of the Naoetsu LNG Terminal.
Starts up the Naoetsu LNG Terminal in Japan.
Completion of Naoetsu LNG Base (Heisei 25)
Extension of the expiration date for the Upper Zakum Oil Field interests in the UAE.
The concession agreement for the Upper Zakum Oil Field offshore Abu Dhabi is extended.
Extension of the Upper Zakum Oil Field rights in the United Arab Emirates (Heisei 26)
The concession agreement for the Upper Zakum Oil Field offshore Abu Dhabi is extended.
Acquisition of interests in the United Arab Emirates ADCO oil field (oil production project)
Participation in the Salura geothermal IPP project
Acquires a participating interest in the ADCO Onshore Concession (now the Abu Dhabi Onshore Concession) in Abu Dhabi.
Joins the Sarulla Geothermal Independent Power Producer Project in Indonesia.
Acquires a participating interest in the ADCO Onshore Concession (now the Abu Dhabi Onshore Concession) in Abu Dhabi. Joins the Sarulla Geothermal Independent Power Producer Project in Indonesia.
(Heisei 27) Acquired interests in the UAE ADCO Oil Production Project and participated in the Salura Geothermal IPP Project.
Acquisition of rights in the ADCO block (oil production project) in the United Arab Emirates, participation in the Salura Geothermal IPP Project (Heisei 27)
Start of supply for the Toyama Line
Start of crude oil shipment from Kashagan oil field off the North Caspian Sea, Kazakhstan
Starts full-scale operations of the Toyama Line in Japan.
The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts.
Starts full-scale operations of the Toyama Line in Japan. The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts.
(Heisei 28) Started supply of Toyama Line and began crude oil shipment from Kashagan Oil Field in North Caspian, Kazakhstan.
Starts full-scale operations of the Toyama Line in Japan and the dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts.
Starts full‑scale operations of the Toyama Line in Japan. The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts.
Start of crude oil shipment from Kashagan Oil Field in the North Caspian Sea, Kazakhstan, and commencement of supply for the Toyama Line (Heisei 28)
Extension of interest rights in the Caspian Sea ACG oil field, Azerbaijan, by 25 years
The concession agreement for the ACG Oil Fields in Azerbaijan is extended.
(Heisei 29) Extended the expiration of the Azerbaijan Caspian ACG Oil Field interests by 25 years.
Extension of the Azeri Oil Field rights in the Caspian Sea, Azerbaijan, by 25 years (Heisei 29)
Acquisition of interests in the Abu Dhabi Lower Zakum oil field and extension of interest rights in the Satah Uum Al Dalk oil field, United Arab Emirates
Start of production at Australia Ichthys LNG project
Start of production at Australia Prelude FLNG project
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi.
The concession agreement for the Satah and Umm Al-Dalkh Oil Fields offshore Abu Dhabi is extended.
Begins production at the Ichthys LNG Project in Australia.
Production starts at the Prelude FLNG Project.
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi. The concession agreement for the Satah and Umm Al-Dalkh Oil Fields offshore Abu Dhabi is extended. Begins production at the Ichthys LNG Project in Australia. Production starts at the Prelude FLNG Project.
(Heisei 30) Acquired interests in the UAE Lower Zakum Oil Field and extended the expiration of the Satyr Um Al Dar Oil Field interests. Production started at the Australia Ixis LNG Project and the Prelude FLNG Project.
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi, extends the concession agreement for the Satah and Umm Al‑Dalkh Oil Fields offshore Abu Dhabi, begins production at the Ichthys LNG Project in Australia, and starts production at the Prelude FLNG Project.
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi. The concession agreement for the Satah and Umm Al‑Dalkh Oil Fields offshore Abu Dhabi is extended. Begins production at the Ichthys LNG Project in Australia. Production starts at the Prelude FLNG Project.
Acquisition of rights in the Lower Zakum Oil Field in the UAE, extension of rights for the Satur-Umm Al Dalk Oil Field, start of production at the Australia Ishis LNG Project, and start of production at the Australia Prelude FLNG Project (Heisei 30)
Approval of development plan (POD) for Indonesia Abadi LNG project
Receives approval of the revised plan of development for the Abadi LNG Project in Indonesia.
(Reiwa 1) Approved development plan (POD) for the Indonesia Abadi LNG Project.
Approval of development plan (POD) for the Abadi LNG Project in Indonesia (Reiwa 1)
Announcement of "Future Business Development - Towards a Net Zero Carbon Society by 2050"
Change of company name from Inpex Corporation to INPEX Corporation
Participation in the Norway North Sea Snorre project
Participation in the Indonesia Muara Laboh geothermal power project
(Reiwa 3) Announced future business development ~ Towards a net-zero carbon society by 2050, changed company name from International Petroleum Development Co., Ltd. to INPEX Corporation, entered the North Sea Snorre Project in Norway, and participated in the Muara Laboh Geothermal Power Project in Indonesia.
Announcement of future business development towards a net-zero carbon society by 2050, change of company name from Japan Petroleum Exploration Co., Ltd. to INPEX Corporation, entry into the Norway North Sea Snow Le Project, and entry into the Muara Laboh Geothermal Power Project in Indonesia (Reiwa 3)
Announces "Business Development Strategy - Towards a Net Zero Carbon Society by 2050." Changes its Japanese corporate name to Kabushiki Kaisha INPEX. Joins the Snorre Project in the Norwegian North Sea. Joins the Muara Laboh Geothermal Power Project in Indonesia.
Announces "Business Development Strategy - Towards a Net Zero Carbon Society by 2050."
Changes its Japanese corporate name to Kabushiki Kaisha INPEX.
Joins the Snorre Project in the Norwegian North Sea.
Joins the Muara Laboh Geothermal Power Project in Indonesia.
Announcement of "Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022)"
Participation in the Dutch offshore wind power projects (Lufta Dauen, Borssele III/IV)
Announces the formulation of the “Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022).”
Joins the Luchterduinen and Borssele III/IV offshore wind power projects in the Netherlands.
(Reiwa 4) Announced long-term strategy and medium-term management plan (INPEX Vision @2022), entered the Dutch offshore wind power projects (Luftadauen, Borssele III/IV).
Announcement of the Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022), entry into offshore wind power projects in the Netherlands (Luchterduinen, Borssele III/IV) (Reiwa 4)
Announces the formulation of the “Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022).” Joins the Luchterduinen and Borssele III/IV offshore wind power projects in the Netherlands.
Participation in the UK offshore wind power project (Moray East)
Joins the Moray East offshore wind power project in the UK.
(Reiwa 5) Entered the UK offshore wind power project (Moray East).
Entry into the Moray East offshore wind power project in the UK (Reiwa 5)
Announcement of "INPEX Vision 2035"
Announces the formulation of the “INPEX Vision 2035.”
Announcement of INPEX Vision 2035 (Reiwa 7)
INPEX CORPORATION has been awarded both the Best IR Award and the "Most Liked!" IR Award for the first time in the 2026 IR Award organized by the Japan Investor Relations Association (JIRA). The awards recognize companies that demonstrate a deep understanding of investor relations, proactively engage in IR activities, and achieve outstanding results. A total of 359 publicly traded companies applied for the 2026 IR Award, and 13 companies were selected.
2026 December Fiscal Year Q3 Earnings Presentation (Video Streaming)
INPEX Co., Ltd. received the IR Excellence Award 2026 and the "Empathy! IR Award" for the first time, as selected by the Japan IR Council. The reasons for the award included top management's responsive stance toward the market, rapid disclosure of information regarding crude oil price fluctuations, concrete presentation of medium- to long-term vision, and continuous improvement of the IR department.
We announced the Q3 results for FY 2026-12. The earnings release (IFRS) (consolidated) and supplementary explanatory materials are available.
INPEX Corporation announced the acquisition of its treasury stock during the period from October 1 to October 31, 2026. The company purchased 11,071,800 common shares at a total cost of 1,000,000,000 yen. The acquisition was made in accordance with Article 156 of the Companies Act and Article 165, Paragraph 3 of the same Act.
The INPEX website will be temporarily unavailable from 09:00 to 20:00 JST on Wednesday, November 11, 2026, due to scheduled server maintenance. The company apologizes for any inconvenience caused.
INPEX Corporation reported that it repurchased 11,071,800 shares of common stock between October 1, 2026, and October 31, 2026, with a total purchase price of 41,780,654,300 yen.
Our company website will be temporarily unavailable due to server maintenance from 09:00 to 20:00 (scheduled) on Wednesday, November 11, 2026. We apologize for any inconvenience caused and appreciate your understanding.
Joetsu City and INPEX CORPORATION have entered into a partner agreement to generate forest-derived J‑Credits from forests managed by Joetsu City. The eight‑year project will commence on October 27, 2026, aiming to create J‑Credits for carbon offsetting.
INPEX and Joetsu City have signed a cooperation agreement to activate forest maintenance and carbon dioxide absorption functions in forests managed by Joetsu City, thereby creating forest-derived J-credits. Under the agreement, they will launch a J-credit creation project for eight years, supply and sell the resulting credits to CO2 emitters to reduce emissions. Joetsu City will reinvest the revenue from the credits into forest maintenance, aiming to maintain and improve public benefits such as disaster prevention and water source conservation.