This is a list of notable companies based in Japan. For further information on the types of business entities in this country and their abbreviations, see "Business entities in Japan". Note that 株式会社 can be (and frequently is) read both kabushiki kaisha and kabushiki gaisha (with or without a hyphen).

Largest firms

This list shows firms in the Fortune Global 500, which ranks firms by total revenues reported before 31 March 2017.^[1]

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Former companies, including acquired and merged ones

• Data East - went into Bankruptcy
• Dream Stage Entertainment
• Daiei Film - went into Bankruptcy, later became part of Tokuma Shoten and now part of Kadokawa Pictures
• Japanese National Railways 日本国有鉄道 - Reorganized into Japan Railways Group
• Japan Post 日本郵政公社 - Reorganized into Japan Post Group
• Prince Motor merged into Nissan
• Square and Enix - Merged to form Square Enix
• Daiichi Pharmaceutical Co. and Sankyo Co. - Merged to form Daiichi Sankyo
• Takata Corporation - went bankrupt then was acquired by Joyson Safety Systems
• Yamanouchi Pharmaceutical and Fujisawa Pharmaceutical - Merged to form Astellas Pharma
• Yaohan
• Tomen - Acquired by Toyota Tsusho
• Nichimen and Nissho Iwai - Merged to form Sojitz