| 1929 |
Founded as Showa Kogyo Co., Ltd. in Yokkaichi City, Mie Prefecture |
| 1930 |
Changed company name to Kamata Choto Co., Ltd. |
| 1937 |
Under the Sumitomo Group, changed company name to Tokai Rubber Industries, Ltd. |
| 1943 |
Start of operations at Matsusaka Factory (now Matsusaka Business Office) |
| 1949 |
Listed on Nagoya Stock Exchange (Nagoya Securities Exchange) |
| 1954 |
Entered the automotive vibration damping rubber business |
| 1959 |
Commercialization of radiator hoses and full-scale entry into automotive hose business |
| 1960 |
Start of operations at Komaki Factory (now Komaki Manufacturing Plant) |
| 1961 |
Changed company name to Tokai Gomu Industries, Ltd. |
| 1964 |
Relocated headquarters from Yokkaichi City to Komaki City, Aichi Prefecture |
| 1971 |
Started manufacturing large-diameter ultra-high-pressure industrial hoses |
| 1976 |
Initiated human resource development activities through on-site improvement activities, started Foreman Training (F Training) |
| 1984 |
Entered the precision parts business for office equipment |
| 1986 |
Completed Technical Center (Komaki City, Aichi Prefecture) |
| 1988 |
Established DTR Industries, Inc. in the United States as the first overseas base (now SumiRiko Ohio, Inc.) |
| 1988 |
Established the first base in Asia (Thailand, China) |
| 1988 |
Established its first base in Europe (Poland) |
| 1988 |
Established TRI Technical Center USA, Inc. (now SumiRiko Technical Center America, Inc.) in the United States as its first overseas development base |
| 1988 |
Established Donghai Rubber & Plastic Technology Center (China) Co., Ltd. (now Sumitomo Riko Automotive Technology Research (China) Co., Ltd.) as its first development base in China |
| 2013 |
Established Sumiriko FC Seal Co., Ltd. in Komae City, Aichi Prefecture, to produce rubber seal components "cell gaskets" |
| 2013 |
Established Sumiriko Yamagata Co., Ltd. as the first automotive vibration-damping rubber production base in Tohoku (Yonezawa City, Yamagata Prefecture) |
| 2013 |
Established the New Product Development Center (now the New Product Development Center) in Komae City, Aichi Prefecture |
| 2013 |
Established the "Sumitomo Riko-Industrial Technology Research Institute Advanced Polymer Device Collaboration Laboratory" jointly with the National Institute of Advanced Industrial Science and Technology in Tsukuba City, Ibaraki Prefecture |
| 2013 |
Established SumiRiko Vietnam Co., Ltd., a manufacturer of automotive hoses in Vietnam |
| 2013 |
Acquired and consolidated Italian automotive hose manufacturer Dytech-Dynamic Fluid Technologies S.p.A. (now SumiRiko Italy S.p.A.) and German automotive vibration-damping rubber manufacturer Anvis Group GmbH (now SumiRiko AVS Holding Germany GmbH) |
| 2013 |
Completed the training center "Unuma Sangakukan" in Gifu Prefecture Kakamigahara City |
| 2014 |
Changed the company name to Sumitomo Riko Co., Ltd. |
| 2014 |
Started mass production of rubber seal components "cell gaskets" for fuel cell vehicle (FCEV) FC stacks |
| 2015 |
Established Sumiriko FC Seal Co., Ltd. in Komae City, Aichi Prefecture, to produce rubber seal components "cell gaskets" |
| 2015 |
Established Yamagata Co., Ltd. as the first automotive vibration-damping rubber production base in Tohoku (Yonezawa City, Yamagata Prefecture) |
| 2015 |
Established the New Product Development Center (now the New Product Development Center) in Komae City, Aichi Prefecture |
| 2015 |
Established the "Sumitomo Riko-Industrial Technology Research Institute Advanced Polymer Device Collaboration Laboratory" jointly with the National Institute of Advanced Industrial Science and Technology in Tsukuba City, Ibaraki Prefecture |
| 2015 |
Established SumiRiko Vietnam Co., Ltd., a manufacturer of automotive hoses in Vietnam |