IR Contact

Please contact IR with questions about SUMCO's Investor Relations.

Before your inquiry

Please check to see if the information you seek is covered in the list of topics below.

Frequently Asked Questions

Questions that are frequently asked by clients and our responses to these questions are presented on this website. We invite you to peruse these page before submitting an inquiry.

Downloads for materials

Materials relating to shareholders and investors are available in the IR Library on this website. You are invited to browse them before submitting an inquiry.

Stock transfer agent

Inquiries pertaining to stock transfer and other administrative stock-related procedures should be directed to Sumitomo Mitsui Trust Bank, Limited.

Securities Agency Dept., Sumitomo Mitsui Trust Bank, Limited.
Mail: 2-8-4 Izumi, Suginami-ku, Tokyo 168-0063, Japan
Telephone: 0120-782-031 (9 a.m. to 5 p.m. / Closed on Sat, Sun, and Holidays)

Contact form


Please read the notes bellow, then click the "Contact form" at the bottom of this page.

  • It may take some time before you receive a response.
  • In addition, it may not be possible for us to provide a response depending on the content of the inquiry.
  • We send email responses to individual clients.
  • The use of any email response, in whole or in part, for any other purpose is expressly prohibited.