Network
| Head Office | 1-2-1 Shibaura, Minato-ku, Tokyo 105-8634, Japan Tel:+81-3-5444-0808 |
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Offices
| Tokyo Office | 1-2-1 Shibaura, Minato-ku, Tokyo 105-8634, Japan Tel:Domestic Sales +81-3-5444-3913 Tel:International Sales +81-3-5444-3918 |
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| Osaka Office | 5-5-15 Nishinakajima, Yodogawa-ku, Osaka 532-0011, Japan Tel:+81-6-6307-7640 |
| Fukuoka Office | 3-1 Shimokawabatamachi, Hakata-ku, Fukuoka 812-0027, Japan Tel:+81-92-291-7767 |
Plants
| Kyushu Factory (Nagahama, Imari) | 826-1 Nagahama, Higashiyamashiro-cho, Imari-shi, Saga 849-4271, Japan Tel:+81-955-22-7015 |
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| Kyushu Factory (Kubara, Imari) | 1-52 Kubara, Yamashiro-cho, Imari-shi, Saga 849-4256, Japan Tel:+81-955-20-2254 |
| Kyushu Factory (Saga) | 2201 Oaza Kamioda, Kohoku-machi, Kishima-gun, Saga 849-0597, Japan Tel:+81-952-71-6555 |
| Kyushu Factory (Nagasaki) | 1324-2 Masuragahara-machi, Omura-shi, Nagasaki 856-8555, Japan |
| Yonezawa Plant | 4-3146-12 Hachimanpara, Yonezawa-shi, Yamagata 992-1128, Japan Tel:+81-238-28-3131 |
| Chitose Plant | 1007-196 Izumisawa, Chitose-shi, Hokkaido 066-0051, Japan Tel:+81-123-28-1877 |
| JSQ Division | 5-14-3 Barajima, Akita-shi, Akita 010-0065, Japan Tel:+81-18-862-1692 |
Major Subsidiaries Companies
| SUMCO TECHXIV Corp. |
Head Office, Nagasaki Plant Ⅰ, Ⅱ 1324-2 Masuragahara-machi, Omura-shi, Nagasaki 856-8555, Japan Tel:+81-957-52-0111 Miyazaki Plant 1112 Kihara, Kiyotake-cho, Miyazaki-shi, Miyazaki 889-1693, Japan Tel:+81-985-84-4601 |
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| High-Purity Silicon Corporation |
Tokyo 1-2-1 Shibaura, Minato-ku, Tokyo 105-8634, Japan Tel:+81-3-5444-4001 Yokkaichi 5 Mita-cho, Yokkaichi-shi, Mie 510-0841, Japan Tel:+81-59-345-5191 Suzuka 5519 Misono-cho, Suzuka-shi, Mie 510-0261, Japan Tel:+81-59-372-3330 |
| SUMCO Technology Corp. | 314 Nishisangao, Noda-shi, Chiba 278-0015, Japan Tel:+81-4-7124-1621 |
| SUMCO Service Corp. | 2201 Oaza Kamioda, Kohoku-cho, Kishima-gun, Saga 849-0506, Japan Tel:+81-952-71-6577 |
| SUMCO Support Corp. | 826-1 Nagahama, Higashiyamashiro-cho, Imari-shi, Saga 849-4271, Japan Tel:+81-955-22-7063 |
| SUMTEC Service Corp. | 1324-2 Masuragahara, Omura-shi, Nagasaki 856-8555, Japan Tel:+81-957-52-0078 |
| SUMCO Insurance Service Corp. | 1324-2 Masuragahara, Omura-shi, Nagasaki 856-8555, Japan Tel:+81-957-54-7209 |
Major Subsidiaries Companies (Overseas)
| SUMCO Phoenix Corporation | 19801 North Tatum Blvd., Phoenix, AZ 85050, U.S.A. Tel：+1-480-473-6000 |
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| SUMCO Southwest Corporation | 19801 North Tatum Blvd., Phoenix, AZ 85050, U.S.A. Tel：+1-480-473-6000 |
| High-Purity Silicon America Corporation | 7800 Mitsubishi Lane Theodore, AL 36582, U.S.A. Tel：+1-251-443-6440 |
| SUMCO Europe Sales Plc | WeWork c/o SUMCO Europe Sales plc, 30 Churchill Place 1st - 10th Floor, London, UK E14 5RE Tel：+44-20-3214-3800 |
| FORMOSA SUMCO TECHNOLOGY CORPORATION |
Taipei Office 8F, No.390, Sec.6, Nanjing E.Rd. Neihu Dist,.Taipei City, Taiwan, R.O.C. Tel：+886-2-2712-2211 Mailiao Plant No.10, Formosa Industrial Park Mailiao, Yunlin, Taiwan R.O.C. Tel：+886-5-681-6950 |
| PT. SUMCO Indonesia | MM2100 Industrial Town Block GG-6, Cikarang Barat, Bekasi 17520, INDONESIA Tel：+62-21-898-0003 |
| SUMCO Singapore Pte.Ltd. | 7 Temasek Boulevard, #22-01 SUNTEC Tower One, Singapore 038987 Tel：+65-6883-1570 |
| SUMCO Shanghai Corporation | Room 2509-2511, Shanghai Maxdo Center, No.8, Xingyi Rd, Shanghai 200336, CHINA Tel：+86-21-5208-0333 |
| SUMCO Korea Corporation | 7F, 10, Hwangsauel-ro 351-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13590, Korea Tel：+82-31-709-5732 |
| SUMCO Taiwan Technology Corporation | 9F, No.417, Sec.2, Gongdao 5th Road, HsinChu City, Taiwan R.O.C. Tel：+886-3-571-2838 |