Japan

Top 12 largest Japanese Companies in the Oil & Gas Refining & Marketing industry by Market Cap

This is the list of the largest public listed companies in the Oil & Gas Refining & Marketing industry from Japan by market capitalization with links to their reference stock.

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Top Oil & Gas Refining & Marketing Companies from Japan as of Jan. 01, 2026

Rank Company Market Cap (USD) Country Sector Industry
1 ENEOS Holdings, Inc. $17.65 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
2 Idemitsu Kosan Co.,Ltd. $9.04 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
3 Itochu Enex Co.,Ltd. $1.37 B Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
4 San-Ai Oil Co.,Ltd. $834.5 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
5 Mitsuuroko Group Holdings Co.,Ltd. $833.5 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
6 Kamei Corp $567.8 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
7 Sinanen Holdings Co. Ltd $472.8 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
8 TOA Oil Co. Ltd $290.6 M

(Dec. 1, 2022)

 Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
9 BP Castrol K.K. $141.1 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
10 Nagaoka International Corp $60.3 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
11 Sanrin Co. Ltd $56.2 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing
12 Fuji Kosan Company Ltd $51.0 M Japan Japanese Energy Japanese Oil & Gas Refining & Marketing

Top Oil & Gas Refining & Marketing Companies from Japan as of Jan. 01, 2026

1. ENEOS Holdings, Inc.

Company Profile: ENEOS Holdings, Inc.
Market Cap (USD): $17.65 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

2. Idemitsu Kosan Co.,Ltd.

Company Profile: Idemitsu Kosan Co.,Ltd.
Market Cap (USD): $9.04 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

3. Itochu Enex Co.,Ltd.

Company Profile: Itochu Enex Co.,Ltd.
Market Cap (USD): $1.37 B
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

4. San-Ai Oil Co.,Ltd.

Company Profile: San-Ai Oil Co.,Ltd.
Market Cap (USD): $834.5 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

5. Mitsuuroko Group Holdings Co.,Ltd.

Company Profile: Mitsuuroko Group Holdings Co.,Ltd.
Market Cap (USD): $833.5 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

6. Kamei Corp

Company Profile: Kamei Corp
Market Cap (USD): $567.8 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

7. Sinanen Holdings Co. Ltd

Company Profile: Sinanen Holdings Co. Ltd
Market Cap (USD): $472.8 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

8. 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

9. BP Castrol K.K.

Company Profile: BP Castrol K.K.
Market Cap (USD): $141.1 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

10. Nagaoka International Corp

Company Profile: Nagaoka International Corp
Market Cap (USD): $60.3 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

11. Sanrin Co. Ltd

Company Profile: Sanrin Co. Ltd
Market Cap (USD): $56.2 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

12. Fuji Kosan Company Ltd

Company Profile: Fuji Kosan Company Ltd
Market Cap (USD): $51.0 M
Country: Japan
Sector: Japanese Energy
Industry: Japanese Oil & Gas Refining & Marketing

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