| Oct. 1959 | The petrochemical sector of Maruzen Oil (renamed to Cosmo Energy Holdings) Co.,Ltd. is separated as an independent unit and established with a capital investment of ¥2.5 billion(100% share)by Maruzen Oil Co.,Ltd. |
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| Feb. 1964 | Capital investments are received from Ube Industries Ltd. (renamed to UBE Corporation), Chisso (renamed to JNC Corporation), Denki Kagaku Kogyo K.K. (renamed to Denka Company Limited ), Nissan Chemical Industries,Ltd. and Nippon Soda Co.,Ltd. |
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| Jun. 1964 | Commencing commercial operation of No.1 Ethylene production Unit |
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| Apr. 1966 | Commencing commercial operation of No.2 Ethylene production Unit and the No.1 Aromatic Extraction Unit |
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| Apr. 1969 | Commencing commercial operation of No.3 Ethylene production Unit and No.2 Aromatic Extraction Unit |
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| Aug. 1969 | Establishment of Chiba Butadiene Industry Co., Ltd. as a joint venture for the production and the sale of butadiene |
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| Apr. 1981 | Establishment of Nissan Maruzen Polyethylene Co.,Ltd. as a joint venture for the production and the sale of high-density polyethylene(Jan. 1991:renamed to Maruzen Polymer Co.,Ltd.) |
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| Sep. 1982 | The petrochemical business, including Alcohol Ketone Production Unit, inherited from Maruzen Oil (renamed to Cosmo Energy Holdings) Co., Ltd. |
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| Dec. 1984 | Acquisition of Goi Chemical Co.,Ltd. stock from Maruzen Oil (renamed to Cosmo Energy Holdings) Co.,Ltd. |
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| Oct. 1985 | Establishment of Nisso Maruzen Chemical Co.,Ltd. as a joint venture for the production and the sale of ethylene oxide, ethylene glycol and other products |
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| Mar. 1986 | Commencing commercial operation of Polyparavinylphenol Production Unit |
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| Jul. 1986 | New York representative office is reorganized into Maruzen America Inc. established through 100% capital investment |
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| Sep. 1987 | Commencing commercial operation of Multi Hydrogenation Unit and High-purity dicyclopentadiene Production Unit |
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| Apr. 1989 | Commencing commercial operation of Benzene Production Unit |
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| Apr. 1991 | Commencing commercial operation of No.2 Multi Hydrogenation Unit |
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| Sep. 1991 | Establishment of Keiyo Ethylene Co.,Ltd. for the production and the sale of ethylene, propylene and other products |
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| Jun. 1993 | Establishment of Keiyo Monomer Co.,Ltd. as a joint venture for the production and the sale of Vinyl chloride monomer |
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| Dec. 1994 | Commencing commercial operation of No.4 Ethylene Production Unit (Keiyo Ethylene Co. Ltd.) |
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| Aug. 1997 | Keiyo Polyethylene Co., Ltd. established as a joint venture with Chisso Petrochemical Corporation and Maruzen Polymer Co., Ltd. |
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| Dec. 1997 | ISO (International Organization for Standardization) 9002 certified |
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| Aug. 1998 | Commencing commercial operation of Vinyl Ｅther Production Unit |
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| Nov. 1999 | ISO14001 certified |
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| Oct. 2002 | Commencing commercial operation of MARUKA LYNCUR Production Unit |
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| Oct. 2004 | Establishment of Ube Maruzen Polyethylene Co.,Ltd. as a joint venture for the production of Low-density polyethylene |
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| Dec. 2004 | Head Office (Specialty Chemicals Dept.) and Research Center acquired ISO 9001 certification. |
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| Apr. 2005 | Merger of Maruzen Polymer Co.,Ltd. and Maruzen Chemical Co.,Ltd. Establishment of CM Aroma Co.,Ltd. as a joint venture for the production and the sale of Mixed xylene |
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| Dec. 2005 | Setting up CSR committee |
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| Jun. 2008 | Revamp No.3 Ethylene Production Unit to enhance its international competitiveness |
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| Jul. 2013 | Head Office relocated to 1-1, Irifune 2-chome, Chuo-ku, Tokyo |
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| Mar. 2016 | Became a consolidated subsidiary of Cosmo Energy Holdings Co., Ltd. |
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| Feb. 2018 | Chiba Arkon Production Limited established as a joint venture with Cosmo Energy Holdings Co., Ltd. and Arakawa Chemical Industries, Ltd. |
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| Oct. 2019 | 60th anniversary of foundation |
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| Dec. 2019 | Commencing commercial operation of No.2 Vinyl Ether Production Unit |
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| Jul. 2020 | Renewal of large cracking furnace for No. 3 Ethylene Production Unit completed |
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| May. 2022 | Commencing commercial operation of Propylene Distillation Unit |
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