Notice Regarding Determination of Selling Price and Other Matters pdf

February 4, 2026 4-1, Marunouchi 1-chome, Chiyoda-ku, Tokyo

Shin-Etsu Chemical Co., Ltd.

Yasuhiko Saitoh Representative Director / President

(Code No. 4063)

Contact: Toshiyuki Kasahara

Corporate Officer, General Manager Finance and Accounting Department

TEL: +81-3- 6812-2350

Shin-Etsu Chemical Co., Ltd. (the "Company") hereby announces that the selling price and other matters have been determined today as follows in connection with the secondary offering of shares of the Company which was resolved at the Board of Directors' meeting held on January 27, 2026.

1. Secondary Offering of Shares (Secondary Offering by way of Purchase and Underwriting by the Underwriters)

   1. Selling price JPY 5,062 per share

   2. Total amount of the selling price JPY 119,876,765,400

   3. Underwriting price JPY 4,853.24 per share

   4. Total amount of the underwriting price JPY 114,932,973,708

   5. Delivery date Thursday, February 12, 2026 Note: The underwriters will purchase and underwrite the shares at the underwriting price

      and offer and sell those shares at the selling price.

2. Secondary Offering of Shares (Secondary Offering by way of Over-Allotment)

   1. Number of shares to be offered 3,552,200 shares

   2. Selling price JPY 5,062 per share

   3. Total amount of the selling price JPY 17,981,236,400

   4. Delivery date Thursday, February 12, 2026