1927-

The Group's beginnings can be traced to the founding of Denko Anthracite Trading in April 1927 for the purpose of selling Korean anthracite.
That company was reorganized to Tokyo Anthracite Co., Ltd. in September 1929, and started manufacturing and sales of charcoal briquettes.
In April 1934, Shinagawa Briquette Co., Ltd. was established and started manufacturing and sales of oval charcoal briquettes.
In May 1936, Shinagawa Briquette Co., Ltd. changed the company name to Shinagawa Fuel Co., Ltd. In March 1937, Shinagawa Fuels Co., Ltd. merged with Tokyo Anthracite Co., Ltd.

1937Mar.

Absorbed Tokyo Anthracite Co., Ltd., took over its briquette manufacturing factory in Chiba, and expanded manufacturing and sales of charcoal briquettes, charcoal sales operations, and sales of charcoal briquette burning appliances.

1952Sep.

Launched sales of petroleum products and equipment (kerosene, gasoline, heavy oil, light oil, etc. and petroleum equipment).

1953Sep.

Absorbed Japan Briquette Industry Co., Ltd., took over its Nagoya Factory, Koto Factory, Yokohama Factory, Nagoya Branch, and Osaka Branch and expanded manufacturing and sales of charcoal briquettes.

1954May.

Acquired Sanko Fuel Co., Ltd. and changed the company name to Chiba Briquette Industry Co., Ltd. (Chibanen Co., Ltd.).

1955Apr.

Launched sales of LP gas and LP gas equipment (propane gas, butane gas, autogas, and gas equipment).

1963Jan.

Listed on the Second Section of the Tokyo Stock Exchange.

1975-

1975Aug.

Invested in Hidaka Ataka Co., Ltd. (now Hidaka Toshi Gas Co., Ltd.).

1983Sep.

Listed on the First Section of the Tokyo Stock Exchange.

1989Apr.

Established Sinanen Sekiyu Co., Ltd.

1991Mar.

Established Sinanen Zeomic Co., Ltd.

1998Apr.

Changed the company name from Shinagawa Fuels Co., Ltd. to Sinanen Co., Ltd. (now Sinanen Holdings Co., Ltd.).

2000-

2001Oct.

Established Nichimen Energy Gas Sales KK by taking over the LP gas business of Nichimen Energy KK.

2002Apr.

Commenced operation of Sinanen Kanto Gas Sales Co., Ltd. (now Melife Co., Ltd.) by integrating six LPG sales companies in the Kanto region.

2003Apr.

Commenced operation of Sinanen Tohoku Gas Sales Co., Ltd. (now Melife Tohoku Co., Ltd.) by integrating three LPG sales companies in the Tohoku region.
Commenced operation of Chubu Sinanen Gas Sales Co., Ltd. (now Melife Chubu Co., Ltd.) by integrating two LPG sales companies in the Chubu region.

2004Feb.

Made Chibanen Co., Ltd., Miyanen Co., Ltd., Shinagawa Hainen Co., Ltd. (now Sinanen Co., Ltd.) and Hidaka Toshi Gas Co., Ltd. wholly owned subsidiaries via share exchange.

2005Apr.

Merged Nichimen Energy Gas Sales KK and Chibanen Home Gas Co., Ltd. with Sinanen Kanto Gas Sales Co., Ltd. (now Melife Co., Ltd.), which sells LP gas primarily in the Kanto region, the latter being the surviving company.

2006Apr.

Merged Chibanen Co., Ltd., Miyanen Co., Ltd. and Alps Industry Co., Ltd.

2008Dec.

Acquired all shares of Kanto Cosmo Gas Co., Ltd. (Kanto Eneport Co., Ltd.), Kinki Cosmo Gas Co., Ltd. (Melife Kansai Co., Ltd.), and Hyogo Tsubame Propane Sales Co., Ltd. (Melife Kansai Co., Ltd.).

2009Mar.

Acquired all shares of Minos Co., Ltd.

2013Jan.

Acquired all shares of Aoba Bicycle Co., Ltd. (now Sinanen Bike Co., Ltd.).

2015Apr.

Integrated retail and wholesale energy business by region, with Melife Kansai Co., Ltd. (now Melife-West Co., Ltd.), Melife Co., Ltd., and Melife Tohoku Co., Ltd. (now Melife-East Co., Ltd.) as the surviving companies.
Transferred the bicycle import and sales business to Aoba Bicycle Co., Ltd. and changed the name to Sinanen Bike Co., Ltd.

Oct.

Transferred petroleum wholesale and solution businesses to Shinagawa Hainen Co., Ltd. via simplified absorption-type split. Changed the company name to Sinanen Co., Ltd.
Shifted to a holding company structure and changed the company name from Sinanen Co., Ltd. to Sinanen Holdings Co., Ltd.

2017Mar.

Acquired all shares of Takara Building Maintenance Co., Ltd.

2018Dec.

Sinanen Co., Ltd. acquired BELLSION POWER CO., LTD. shares to develop the large-scale wind power generation business in South Korea.

2019Jan.

Relocated HQ from Kaigan, Minato-ward to Mita, Minato-ward, Tokyo.

Apr.

Sinanen Bike Co., Ltd. split off its bike-sharing business into Bike-Sharing Successor Preparatory Company (now Sinanen Mobility Plus Co., Ltd.).

2020Feb.

Sinanen Co., Ltd. established Sinagy Revo Co., Ltd. for the development, sales, and maintenance of products that are for use with micro wind turbines.

2022Apr.

Moved to the Tokyo Stock Exchange, Prime

2023Apr.

Start of the 3rd Medium-Term
Management Business Plan (FY2023-2027)

Oct.

Aiming to integrate the building maintenance and management business, the Group conducted an absorption-type merger of Indess Co., Ltd. and Gus System Co., Ltd., with Takara Building Maintenance Co., Ltd. as a surviving company, changing the name of the post-merger company to Sinanen Axia Co., Ltd.

2024Jul.

Relocated HQ from Mita, Minato-ward to Higashi-Shinagawa, Shinagawa-ward, Tokyo.