| 1909 | Seiji Masui, the founder, opened the Masui Shoten in Nakadachi-Uri Agaru, Kuromon Dori, Kamigyo-ku, Kyoto and began to import mainly raw silk and tussar silk yarn from China. |
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| 1919 | The short fiber, the bright yarn manufacturing factory was opened in Marutamachi Agaru, Higure Dori, Kamigyo-ku, Kyoto. Manufacturing of mosquito net yarn and tussar silk yarn twisting and refining took place here. |
| 1920 | Products from the Yonezawa and Hiroshima factories of Teikoku Jinzo-Kenshi Kaisha, Ltd. (currently Teijin Limited) began to be carried. |
| 1921 | In Murasakino Monzencho, Kamigyo-ku, Kyoto, arefiningand throwing factory was set up. A new usage as electric cable coating for insulation was developed, and sales began. |
| 1923 | Manufacturing and sales of Lily rayon yarn and various other threads for handicrafts began at the Murasakino factory listed above. |
| 1924 | Koshin Shokai & Co., Ltd., the subsidiary company, was founded in Meguro-ku, Tokyo. The Masui Shop Tokyo Branch Office was opened in the same location. |
| 1925 | The headquarters was moved to a newly built location in Imadegawa, Chiekoin Dori, Kamigyo-ku, Kyoto. Became the sole agent for Mie Jinzo-Kenshi Co., Ltd. |
| 1926 | In addition to becoming the sole rayon importer for SNIA and SHIOSA, began imports and sales for hollow rayon Selter. |
| 1928 | Became the sole agent for Toyo Rayon Co., Ltd. (currently Toray Industries). |
| 1931 | Established Masui Shoten General Partnership Company. Carried on the business of Masui Shop. The Osaka Branch Office was opened in Awajimachi, Chuo-ku, Osaka. |
| 1932 | Became a member of the Osaka Rayon Exchange. |
| 1934 | Became the sole agent for Teikoku Jinzo-Kenshi Kaisha, Ltd. and Showa Jinken Co., Ltd. |
| 1939 | Established Maruten Kogyo Co., Ltd., the subsidiary, in Anto, Manchuria (currently Dandong, Liaoning, China). The Kyoto branch of the company was placed in Masui Shop General Partnership Company, and exporting from Japan to Manchuria began. |
| 1942 | Maruten Cast Iron Co., Ltd., the subsidiary, was established in Anshan, Manchuria, and production of cast iron began. |
| 1943 | The name of Masui Shoten General Partnership Company was changed to Masui General Partnership Company. |
| 1944 | Due to the act of industrial adjustment in wartime, the company was integrated into Nihon Jinken-ito Tosei Hanbai Co., Ltd., and operations halted temporarily. |
| 1947 | Operations resumed after being registered by the Ministry of Commerce and Industry as a fabric material shop. |
| 1948 | Seiji Masui passed away, and Eizo Masui was appointed as the representative partner. |
| 1951 | MASUI Co., Ltd. (capital of 1 million yen) was founded. Carried on the business of Masui General Partnership Company. |
| 1952 | Expanded sales while developing nylon yarn for Toyo Rayon Co., Ltd. (currently Toray Industries). |
| 1957 | Opened the Kahoku Contact Office in Kahoku, Ishikawa. |
| 1958 | Increased capital (new capital of 2.5 million yen) and acquired capital participation from Teijin Limited and Toray Industries. |
| 1962 | Became the sole agent for Kurashiki Rayon Co., Ltd. (currently Kuraray Co., Ltd.). |
| 1963 | Expanded the Kahoku Contact Office to the Kahoku Branch Office. |
| 1964 | Increased capital (capital of 5 million yen). |
| 1965 | Became a friendly trading company of the overseas trade division of China, and began importing raw silk and tussar silk yarn from Chinese textile companies. |
| 1970 | Opened the Tango Contact Office in Omiyacho, Kyoto. |
| 1971 | Increased capital (new capital of 10 million yen) and moved the headquarters to a newly built location in Hirano Hatchoyanagicho, Kita-ku, Kyoto to celebrate the 20th anniversary since founding. Acquired capital participation from Kuraray Co., Ltd. Became the sole agent for Asahi Kasei Corporation. |
| 1972 | Established Masui Trading Company through restoration of diplomatic relations between Japan and China. |
| 1986 | Began trading directly with Chinese trading companies. |
| 1994 | Increased capital (new capital of 11 million yen), rebuilt the Kahoku Branch Office, and invested in J&S Metallic Yarn Co., Ltd. |
| 2001 | Opened the Masui Qingdao Office and established the Qingdao Masui Trading Corporation. |
| 2002 | Opened the Tokyo Office (currently the business office) in Nihonbashi Horidomecho, Chuo-ku, Tokyo. Proactively hired foreign workers and mid-career workers to further improve human resources. |
| 2003 | Keiji Masui, the current president, was appointed as the president and representative director, the Ichinomiya Branch Office was opened, and the small and medium enterprise retirement benefit and mutual aid scheme was implemented. |
| 2004 | The headquarters were moved to the Nihon Seimei Kyoto Santetsu Building in Higashi Shiokoji-cho, Shimogyo-Ku, Kyoto, and Masui Trading Company was absorbed. |
| 2005 | Opened the Fukui Office in Senkyo Building Room 715 in 3 Chome-7-1 Ote, Fukui. |
| 2006 | Established Snappy Auction Co., Ltd. as a wholly owned subsidiary. Opened the (fully owned by Japan) Qingdao Masui Corporation. Established C&C Corporation and entered the restaurant industry. Established the first mid-term plan and the new human resource policy. |
| 2007 | Acquired capital participation from the Bank of Kyoto, Ltd., and restructured the company from 3 sales departments and 11 business units to 2 sales departments and 6 business units. |
| 2009 | Moved the headquarters to a building acquired in 328 Sashimono-cho, Nakagyo-ku, Kyoto. |
| 2010 | Increased capital (new capital of 12 million yen) |
| 2011 | Established employment regulations and family and medical leave regulations. |
| 2012 | Increased capital (new capital of 14 million yen). |
| 2013 | Moved the Tokyo Office to the 5th Floor of the Hayami Building in Nihonbashi, Chuo-ku, Tokyo. Began operations of the new core system. Acquired Osaka Sugimoto Co., Ltd. through mergers and acquisitions. |
| 2015 | Began the female career promotion project and started internal language studies. Purchased a membership resort facility (XIV Toba) as a facility for employee benefits. |
| 2016 | Integrated systems with OSAKA SUGIMOTO Co., Ltd. and built a linked structure. |
| 2017 | Started the 3rd sales department (textile business). Opened the Ashikaga Branch Office. Began the human resource policy reform project. Opened the 1st beauty salon treatment shop "B'PRODUCE" in Okazaki, Aichi. Implemented the childcare leave policy. Created and implemented the new employee training and nurturing program. Held a commemorative event at XIV Kyoto Yase Rikyu to commemorate the joint establishment of MASUI Co., Ltd. and OSAKA SUGIMOTO Co., Ltd. Moved the headquarters to 3 Chome-3-13 Inabashi, Chuo-ku, Osaka. Established KB TEXTILE Co., Ltd. |
| 2018 | Holding Company, Masui Holdings Co.,Ltd is fonded. Open "B'PRODUCE" Nishio Branch. At signing ceremony for "the 14th Uzbekistan-Japan Economic Committees", conclude MOU（Memorandum of Understanding）in the silk garment field between Uzbekistan silk industrial society and Masui Co., Ltd with Uzbekistan silk industrial society. Employee association "Hishiesukai" whose main purpose is welfare is incorporated. Real estate department, esthetics department, and food Department are company split and trasferred to "Adapt Co., Ltd". President Mr.Keiji Masui retired President & Representative Director. |
| 2019 | Mr.Kenichi Osagawa becomes the President & Representative Director. RPA(Robotic Process Automation)was introduced in part of administrative works. A new severance package system started. Defined Contribution Plans were introduced. The 110th anniversary party was held at Conrad Osaka. Platinum Horse, White Mountain, Rayon Viscose filament yarn, was certified as Eco Mark products. CEO Keiji Masui attended a welcome reception for the President of Uzbekistan at The Prime Minister's Official Residence. The MOU(Memorandum of Understanding)for textile business development was signed among Masui Co.,LTD, the Uztekstilprom Association and Art Soft Textile at the Japan-Uzbekistan Business Forum. |
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2020 |
Masui Holdings Co., Ltd. Increased capital (new capital of 6.3 million yen) and acquired capital participation from Osaka Small and Medium Business Investment & Consultation Co.,Ltd（SBIC West Japan） |
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2021 |
Kenichi Osagawa was appointed as Chairman. |
