1
ENEOS Holdings
Tokyo
Integrated oil & gas
Major
Largest refiner, domestic & intl. upstream

2
INPEX Corporation
Tokyo
Upstream exploration & production
Major
Japan’s largest upstream oil/gas company

3
Japan Petroleum Exploration (JAPEX)
Tokyo
Upstream oil & gas
Large
Domestic & international E&P

4
Idemitsu Kosan
Tokyo
Integrated oil & gas
Major
Refining & upstream projects

5
Mitsubishi Corporation
Tokyo
Trading, upstream investments
Major
Diversified sogo shosha, global oil assets

6
Mitsui & Co.
Tokyo
Trading, upstream investments
Major
Sogo shosha, global oil & gas projects

7
Cosmo Energy Holdings
Tokyo
Integrated oil
Large
Refining & upstream ventures

8
ITOCHU Corporation
Tokyo
Trading, upstream interests
Major
Sogo shosha with energy investments

9
Sumitomo Corporation
Tokyo
Trading, upstream interests
Major
Sogo shosha, global resource projects

10
JX Nippon Oil & Gas Exploration
Tokyo
Upstream oil & gas
Large
ENEOS upstream subsidiary

11
Japan Oil, Gas and Metals National Corp (JOGMEC)
Tokyo
State-backed resource investment
Large
Supports Japanese companies upstream

12
INPEX Offshore North Caspian Sea Ltd. (via INPEX)
Tokyo
Upstream project operator
Large
Kashagan field participant

13
Teikoku Oil (Conducted by JAPEX)
Tokyo
Upstream oil & gas
Medium
Historical producer, now under JAPEX

14
Japan Petroleum Development Association
Tokyo
Industry group, research
Medium
Represents domestic upstream interests

15
Sojitz Corporation
Tokyo
Trading, upstream interests
Medium
Sogo shosha with oil & gas assets

16
Marubeni Corporation
Tokyo
Trading, upstream interests
Major
Sogo shosha, global energy projects

17
TonenGeneral Sekiyu K.K. (ENEOS Group)
Tokyo
Refining, upstream links
Large
Integrated operations

18
Showa Shell Sekiyu K.K. (Idemitsu Group)
Tokyo
Integrated oil
Large
Refining & upstream activities

19
Taiyo Oil Co., Ltd.
Tokyo
Refining, upstream interests
Medium
Independent refiner with E&P

20
Kansai Electric Power Co.
Osaka
Utility, upstream investments
Large
Invests in oil/gas for fuel

21
Tokyo Gas Co., Ltd.
Tokyo
Gas utility, upstream oil/gas
Large
Upstream investments for supply

22
Osaka Gas Co., Ltd.
Osaka
Gas utility, upstream oil/gas
Large
Upstream investments for supply

23
Tohoku Electric Power Co.
Sendai
Utility, upstream investments
Large
Invests in oil/gas projects

24
Chubu Electric Power Co.
Nagoya
Utility, upstream investments
Large
Invests in oil/gas projects

25
Nippon Steel Trading Corporation
Tokyo
Trading, resource investments
Medium
Invests in upstream resources

26
Mitsui Oil Exploration Co. (MOECO)
Tokyo
Upstream oil & gas
Medium
Mitsui group E&P company

27
JAPAN LNG TRADING LLC (JAPEX, etc.)
Tokyo
Trading, upstream linked
Medium
JAPEX related trading venture

28
Nippon Mining & Metals Co. (JX Group)
Tokyo
Non-ferrous metals, energy
Medium
ENEOS group, resource interests

29
Mitsubishi Gas Chemical Company
Tokyo
Chemicals, upstream interests
Medium
Invests in resource projects

30
Toyota Tsusho Corporation
Nagoya
Trading, upstream interests
Large
Part of Toyota Group, energy E&P