Group Companies
- Nippon Polytech Corp.
- Showa Denko Gas Products Co., Ltd.
- Showa Titanium Co., Ltd.
- Showa Denko Kenso Co., Ltd.
- Tohoku Metal Chemical Co., Ltd.
- Showa Aluminum Can Corp.
- Showa Denko Aluminum Trading K.K.
- Showa Denko Packaging Co.,Ltd.
- Showa Denko HD Yamagata K.K.
- Showa Denko Kenzai K.K.
- Shoko Co., Ltd.
- Fuyo Perlite Co., Ltd.
- Union Showa K.K.
- Group Companies
