Chugai Pharmaceutical Co., Ltd. (hereafter the “Company”) hereby announces that the Company has resolved at the meeting of the Board of Directors held today, the stock split and partial amendment to the articles of incorporation.

1. Purpose of the stock split

   The stock split aims to reduce the investment unit price for the Company’s stock, increase the liquidity of the stocks, and to further expand the investor base.

2. Outline of the stock split
   1. (a) Method

      Fixing Tuesday, June 30, 2020 as a record date, the Company will split its ordinary share owned by shareholders listed or recorded in the shareholder registry three-for-one.

   2. (b) Number of shares to be increased by the stock split

      (i) Total number of shares issued before the stock split	559,685,889
      (ii) Increase in the number of shares upon the stock split	1,119,371,778
      (iii) Total number of shares issued after the stock split	1,679,057,667
      (iv) Total number of shares issuable after the stock split	2,399,415,150

   3. (c) Schedule

      (i) Announcement of record date	Monday, June 15, 2020
      (ii) Record date	Tuesday, June 30, 2020
      (iii) Effective date	Wednesday, July 1, 2020

3. Partial amendment to the articles of incorporation
   1. (a) Reasons for the amendment

      In line with the stock split, pursuant to the Article 184.2 of the Companies Act of Japan, the Company will amend as of Wednesday, July 1, 2020, the total number of shares issuable set by Article 6 in the Articles of Incorporation of the Company.

   2. (b) Details of the amendment

      Details are as follows.

      Before the amendment	After the amendment
      Article 6. (Total Number of Shares Issuable) The total number of shares issuable of the Company shall be 799,805,050 shares.	Article 6. (Total Number of Shares Issuable) The total number of shares issuable of the Company shall be 2,399,415,150 shares.

   3. (c) Schedule

      Effective date of the amendment to the articles of incorporation: Wednesday, July 1, 2020

4. Others
   1. (a) Change in the amount of stated capital

      The stock split will not change the amount of stated capital