以下为日文网站。
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| Ace Pack Co., Ltd. | Website
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| Eco-Techno Corporation | Website |
| Hodogaya Chemical | Website (English available)
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| Hokuetsu Kasei Co., Ltd. | Website
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| Izumi Sangyo Co., Ltd. | Website
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| Kasumi Engineering Inc. | |
| Kasumi Kyodo Jigyo Co., Ltd. | Website |
| Lonseal Corporation | Website (English available)
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Manac Incorporated
| Website (English and Chinese available)
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| Minami Kyushu Chemical Industry Co., Ltd. | Website |
| Nippon Polyurethane Industry Co., Ltd. | Website (English and Chinese available)
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| Organo Corporation | Website (English available) |
| Plas-Tech Corporation | Website
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| Rensol Co., Ltd. | |
| Rinkagaku Kogyo Co., Ltd. | Website (English available)
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| Sankyo Kasei Industry Corporation | Website |
| Sanwa Construction Co., Ltd. | Website |
Seiwakoki Co., Ltd.
| Website |
| Shinomura Chemical Industry Corporation | Website |
| Taihei Chemicals Ltd. | Website (English available)
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| Taiyo Vinyl Corporation | Website (English available) |
| Toei Kasei Co., Ltd. (Toei Chemical K. K.) | Website
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| Toho Acetylene Co., Ltd. | Website |
| Tohoku Denki Tekko Co., Ltd. | Website
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| Tohoku Tosoh Chemical Co., Ltd. | Website
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| Tokuyama Sekisui Co., Ltd. | Website
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| Tosoh AIA, Inc. | |
| Tosoh Analysis and Research Center Co., Ltd. | Website
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| Tosoh Ceramics Co., Ltd. | |
Tosoh Finechem Corporation
| Website (English available)
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Tosoh F-Tech, Inc.
| Website (English available)
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| Tosoh General Services Co., Ltd. | |
| Tosoh Hi-Tec, Inc. | |
| Tosoh Hyuga Corporation | Website |
| Tosoh Information Systems Co., Ltd. | Website
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| Tosoh Logistics Corporation | Website
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| Tosoh Nikkemi Corporation | Website |
| Tosoh Organic Chemical Co., Ltd. | Website (English available)
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| Tosoh Quartz Corporation | Website
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| Tosoh SGM Corporation | |
| Tosoh Silica Corporation | Website
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| Tosoh Speciality Materials Corporation | Website
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| Tosoh Techno-System, Inc. | |
| Tosoh Zeolum, Inc. | |
| Toyo Polymer Co., Ltd. | |
| Yokkaichi Oxyton Co., Ltd. | |
| Yorin Construction Co., Ltd. | Website
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