Japan

Top 22 largest Japanese Companies in the Energy sector by Market Cap

This is the list of the largest public listed companies in the Energy sector from Japan by market capitalization with links to their reference stock and industry.

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Top Energy Companies from Japan as of Jul. 01, 2025

Rank Company Market Cap (USD) Country Sector Industry
1 Mitsui & Co. Ltd $59.27 B Japan Japanese Energy Japanese Oil & Gas E&P
2 Inpex Corp $16.89 B Japan Japanese Energy Japanese Oil & Gas E&P
3 ENEOS Holdings, Inc. $13.60 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
4 Idemitsu Kosan Co.,Ltd. $7.54 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
5 Cosmo Energy Holdings Co. Ltd $3.59 B Japan Japanese Energy Japanese Oil & Gas Integrated
6 MODEC, Inc. $3.17 B Japan Japanese Energy Japanese Oil & Gas Equipment & Services
7 Japan Petroleum Exploration Co. Ltd $1.86 B Japan Japanese Energy Japanese Oil & Gas E&P
8 Itochu Enex Co.,Ltd. $1.38 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
9 San-Ai Oil Co.,Ltd. $803.2 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
10 Mitsuuroko Group Holdings Co.,Ltd. $796.6 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
11 Kamei Corp $543.1 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
12 Sinanen Holdings Co. Ltd $483.3 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
13 Mitsui Matsushima Holdings Co. Ltd $409.8 M Japan Japanese Energy Japanese Thermal Coal
14 Nippon Concept Corp $294.5 M Japan Japanese Energy Japanese Oil & Gas Midstream
15 TOA Oil Co. Ltd $290.6 M

(Dec. 1, 2022)

 Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
16 Sumiseki Holdings,Inc. $250.2 M Japan Japanese Energy Japanese Thermal Coal
17 HIROSHIMA GAS Co.,Ltd. $172.2 M Japan Japanese Energy Japanese Oil & Gas Integrated
18 Fuji Oil Company Ltd $171.8 M Japan Japanese Energy Japanese Oil & Gas E&P
19 BP Castrol K.K. $133.4 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
20 Nagaoka International Corp $66.8 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
21 Sanrin Co. Ltd $59.0 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
22 Fuji Kosan Company Ltd $55.2 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing

Top Energy Companies from Japan as of Jul. 01, 2025

1. Mitsui & Co. Ltd

Company Profile: Mitsui & Co. Ltd
Market Cap (USD): $59.27 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas E&P

2. Inpex Corp

Company Profile: Inpex Corp
Market Cap (USD): $16.89 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas E&P

3. ENEOS Holdings, Inc.

Company Profile: ENEOS Holdings, Inc.
Market Cap (USD): $13.60 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

4. Idemitsu Kosan Co.,Ltd.

Company Profile: Idemitsu Kosan Co.,Ltd.
Market Cap (USD): $7.54 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

5. Cosmo Energy Holdings Co. Ltd

Company Profile: Cosmo Energy Holdings Co. Ltd
Market Cap (USD): $3.59 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Integrated

6. MODEC, Inc.

Company Profile: MODEC, Inc.
Market Cap (USD): $3.17 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Equipment & Services

7. Japan Petroleum Exploration Co. Ltd

Company Profile: Japan Petroleum Exploration Co. Ltd
Market Cap (USD): $1.86 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas E&P

8. Itochu Enex Co.,Ltd.

Company Profile: Itochu Enex Co.,Ltd.
Market Cap (USD): $1.38 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

9. San-Ai Oil Co.,Ltd.

Company Profile: San-Ai Oil Co.,Ltd.
Market Cap (USD): $803.2 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

10. Mitsuuroko Group Holdings Co.,Ltd.

Company Profile: Mitsuuroko Group Holdings Co.,Ltd.
Market Cap (USD): $796.6 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

11. Kamei Corp

Company Profile: Kamei Corp
Market Cap (USD): $543.1 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

12. Sinanen Holdings Co. Ltd

Company Profile: Sinanen Holdings Co. Ltd
Market Cap (USD): $483.3 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

13. Mitsui Matsushima Holdings Co. Ltd

Company Profile: Mitsui Matsushima Holdings Co. Ltd
Market Cap (USD): $409.8 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Thermal Coal

14. Nippon Concept Corp

Company Profile: Nippon Concept Corp
Market Cap (USD): $294.5 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Midstream

15. TOA Oil Co. Ltd

Company Profile: TOA Oil Co. Ltd
Market Cap (USD): $290.6 M (Dec. 1, 2022)
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

16. Sumiseki Holdings,Inc.

Company Profile: Sumiseki Holdings,Inc.
Market Cap (USD): $250.2 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Thermal Coal

17. HIROSHIMA GAS Co.,Ltd.

Company Profile: HIROSHIMA GAS Co.,Ltd.
Market Cap (USD): $172.2 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Integrated

18. Fuji Oil Company Ltd

Company Profile: Fuji Oil Company Ltd
Market Cap (USD): $171.8 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas E&P

19. BP Castrol K.K.

Company Profile: BP Castrol K.K.
Market Cap (USD): $133.4 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

20. Nagaoka International Corp

Company Profile: Nagaoka International Corp
Market Cap (USD): $66.8 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

21. Sanrin Co. Ltd

Company Profile: Sanrin Co. Ltd
Market Cap (USD): $59.0 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

22. Fuji Kosan Company Ltd

Company Profile: Fuji Kosan Company Ltd
Market Cap (USD): $55.2 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

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