| 1936, June |
Founded for the goal of domestic production of titanium oxide |
| 1938, June |
Completion of the Ube Plant, operations commence |
| 1938, August |
Acquisition of Nippon Ryusan, Ltd. |
| 1962, October |
Public listing on the Tokyo Stock Exchange, Second Section |
| 1965, April |
Synthetic iron oxide sales commence |
| 1969, June |
Magnetic iron oxide sales commence |
| 1987, September |
Listing change to the First Section of the Tokyo Stock Exchange |
| 1993, July |
Completion of the Ube Development Center |
| 2000, December |
Attainment of ISO-9002：1994 certification |
| 2003, August |
Attainment of ISO-14001：2000 certification |
| 2003, December |
Attainment of ISO-9001：2000 certification |
| 2004, May |
Establishment of Shandong Suntiox Industrial Co., Ltd. (affiliated company) with the joint management of Mitsui, Ltd. and Shandong Dongjia Group, Ltd. (China) in Shangdong, China |
| 2004, September |
Enhancement of the production capacity of the Ube Development Center(expantion of the ST-2 plant) |
| 2005, September |
Attainment of ISO-14001：2004 certification |
| 2006, October |
Establishment of TK Service, Ltd. (subsidiary company) |
| 2007, March |
Establishment of the Ube Development Center’s dispersion plant (the ST-3 Plant) |
| 2009, December |
Attainment of ISO-9001: 2008 certification |
| 2010, October |
Completion of the Ube Nishi Plant, operations commence |
| 2012, April |
Enhancement of the production capacity of the Ube Nishi Plant(expantion of the TT-2 plant) |
| 2014, June |
Enhancement of the production capacity of the Ube Development Center (expansion of the ST-4 Plant) |
| 2017, July |
Attainment of GMP by the ultrafine titanium dioxide manufacturing facility (the ST-4 Plant) as an OTC drug substance manufacturing plant |
| 2018, October |
Enhancement of the production capacity of the Ube Development Center (expansion of the ST-5 Plant) |
| 2019, July |
Establishment of TBM, Ltd. (subsidiary company) |
| 2019, September |
Succession of lithium titanate business to TBM, Ltd. due to a corporate split |
| 2019, October |
Joint lithium titanate business commences with Toshiba Corporation |
| 2021, February |
Enhancement of the production capacity of the Ube Development Center(expansion ob the ST-6 Plant) |
| 2022, April |
Transfer from the First Section of the Tokyo Stock Exchange to the Prime Market due to a restructuring of the Tokyo Stock Exchange market divisions |
| 2023, October |
Transfer from the Prime Market of the Tokyo Stock Exchange to the Standard Market |
