We operate in 16 countries and regions, including Japan. Manufacturing sites are as shown in the figure below.
Group Companies (As of June 1, 2025)
| Country/Region | Field* | Each Office |
| Japan | HPP, QOL | Shizuoka Plant |
|---|---|---|
| QOL | Kanuma Plant (including Kanuma Plant of S.B. Sheet Waterproof Systems Co., Ltd.) | |
| Semiconductor | Utsunomiya Plant (including Head Office (Utsunomiya) of S.B. Research Co., Ltd.) | |
| QOL | Amagasaki Plant | |
| QOL | S.B. Sheet Waterproof Systems Co., Ltd. (Nara Plant) | |
| Semiconductor | Kyushu Sumitomo Bakelite Co., Ltd. | |
| HPP | Yamaroku Kasei Industry Co., Ltd. | |
| HPP, QOL | Akita Sumitomo Bakelite Co., Ltd. | |
| QOL | Hokkai Taiyo Plastic Co., Ltd. | |
| QOL | S.B. Techno Plastics Co., Ltd. (Head Office Plant and Kitsuregawa Plant) | |
| QOL | SB-Kawasumi Laboratories, Inc. (Head Office and Oita business sites (Saiki, Notsu, and Mie Plants)) | |
| QOL | SB PAX Co., Ltd. | |
| － | Head Office | |
| － | Nagoya Office | |
| － | Osaka Office | |
| － | Kobe Facility Office | |
| China | Semiconductor | Sumitomo Bakelite (Suzhou) Co., Ltd. |
| HPP | Sumitomo Bakelite (Shanghai) Co., Ltd. | |
| HPP, QOL | Sumitomo Bakelite (Nantong) Co., Ltd. | |
| QOL | Sumitomo Bakelite (Dongguan) Co., Ltd. | |
| HPP | Vaupell China (Dongguan) Co., Ltd. | |
| Macau | HPP | Sumitomo Bakelite Macau Co., Ltd. |
| Hong Kong | － | Sumitomo Bakelite (Hong Kong) Co., Ltd. |
| Taiwan | Semiconductor | Sumitomo Bakelite (Taiwan) Co., Ltd. |
| － | Sumibe (Taiwan) Co., Ltd. | |
| South Korea | － | Sumibe Korea Co., Ltd. |
| India | － | SBE India Private Limited |
| Malaysia | HPP | SNC Industrial Laminates Sdn. Bhd. |
| Singapore | Semiconductor | Sumitomo Bakelite Singapore Pte. Ltd. |
| HPP | SumiDurez Singapore Pte. Ltd. | |
| Indonesia | HPP | P.T. Indopherin Jaya |
| QOL | P.T. SBP Indonesia | |
| Thailand | QOL | Kawasumi Laboratories (Thailand) Co., Ltd. (Nava Nakorn Plant/Korat Plant) |
| － | Sumitomo Bakelite (Thailand) Co., Ltd. | |
| Canada | HPP | Durez Canada Co., Ltd. (Fort Erie) |
| United States | HPP | Sumitomo Bakelite North America, Inc. (Manchester Plant) |
| HPP | Durez Corporation (Kenton Plant) | |
| HPP | Durez Corporation (Niagara Falls Plant) | |
| HPP | Vaupell Industrial Plastics, Inc. | |
| HPP, QOL | Vaupell Molding & Tooling, Inc. (Agawam, Massachusetts Plant) | |
| HPP, QOL | Vaupell Molding & Tooling, Inc. (Constantine, Michigan Plant) | |
| HPP | Russell Plastics Technology Company, Inc. | |
| － | Vaupell Holdings, Inc. | |
| － | Promerus, LLC | |
| － | Kawasumi Laboratories America, Inc. | |
| － | Sumitomo Plastics America, Inc. | |
| Germany | － | Vaupell Europe GmbH |
| Belgium | HPP | Sumitomo Bakelite Europe NV |
| HPP | Sumitomo Bakelite Europe (Ghent) NV | |
| Spain | HPP | Sumitomo Bakelite Europe (Barcelona), S.L.U. |
* Semiconductor: Semiconductor Materials, HPP: High-Performance Plastics, QOL: Quality of Life Products