| March 5, 1969 | Established Maruka Kogyo Co., Ltd. with JPY2.5 million in capital |
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| July 1, 1969 | Started nonlife insurance agent service |
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| December 22, 1976 | Obtained sales operating license for liquefied petroleum gas |
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| January 10, 1977 | Registered as general dealer in Poisonous and Deleterious Substances |
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| September 1, 1982 | Capital reached JPY10 million |
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| November 1, 1985 | Changed corporate name to MARUZEN CHEMICAL COMPANY CO.,LTD |
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| March 1, 1986 | Established Chiba sales office |
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| July 7, 1986 | Obtained sales operating license for general high-pressure gas |
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| July 8, 1986 | Obtained handling license for Coastal transportation |
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| March 17 1987 | Registered as an automobile carrier management service |
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| June 22 1987 | Obtained Coastal transportation license |
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| July 1 1990 | Established Osaka sales office |
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| June 8 1992 | Registered as an automobile carrier management service (Osaka sales office) |
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| July 2 1992 | Registered as general dealer of Poisonous and Deleterious Substances (Osaka sales office) |
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| September 17 1992 | Capital reached JPY40 million |
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| October 10 1992 | Capital reached JPY160 million |
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| November 3 1992 | Capital reached JPY200 million |
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| March 1 2001 | Spun off Chiba sales office to establish Maruzen Techno Service Co., Ltd. |
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| April 1 2005 | Took over Functional chemical products division, Chemical product Dept.-II from Maruzen Petrochemical Co., Ltd., and started sales of EOA. |
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| June 30 2008 | Promoted Osaka sales office to branch office |
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| July 1 2008 | Transferred EOA and DES business to Maruzen Petrochemical Co., Ltd., and restructured the sales Dept.. |
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| April 1 2014 | Transferred nonlife insutance agent service to Maruzen Techno Service Co., Ltd. |
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| June 29 2018 | Restructured the sales departments and transferred the operations of Sales Dept. -3 to Sales Dept. -2 |
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