As for detailed histories of Mitsubishi Chemical Corporation, Mitsubishi Plastics, Inc., and Mitsubishi Tanabe Pharma Corporation, please refer to each website.
| October 3, 2005 | Mitsubishi Chemical Holdings Corporation was jointly established by Mitsubishi Chemical Corporation and Mitsubishi Pharma Corporation, by means of a stock-for-stock exchange effective October 1, 2005. |
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| October 10, 2006 | Relocated the head office to 4-chome, Minato-ku, Tokyo. |
| October 1, 2007 | Mitsubishi Plastics, Inc. became a wholly owned subsidiary of Mitsubishi Chemical Holdings Corporation. Mitsubishi Pharma Corporation and Tanabe Seiyaku Co., Ltd. merged and became a listed subsidiary of Mitsubishi Chemical Holdings Corporation as Mitsubishi Tanabe Pharma Corporation. |
