Notice of a Stock Split and the Related Partial Amendment of the Articles of Incorporation

May 13, 2025

To Whom It May Concern:

Mitsui Matsushima Holdings Co., Ltd. (the "Company") hereby announces that it resolved, at its Board of Directors meeting held today, to carry out a stock split and a partial amendment of the Articles of Incorporation in conjunction with the stock split as follows:

1. Stock split

   1. Purpose of the stock split

      The purpose of the stock split is to create an environment in which investors can invest in the Company's shares more easily and to increase the liquidity of shares and expand its investor base by lowering the minimum required amount for investment in the Company's shares.

   2. Outline of the stock split

      ① Method of the stock split

      The Company will carry out a 5-for-1 stock split for shares of the Company's common stock held by shareholders recorded in the last shareholder register on Tuesday, September 30, 2025.

      ② Increase in the number of shares by the split

      Total number of issued shares before the stock split	13,064,400 shares
      Increase in the number of shares by the split	52,257,600 shares
      Total number of issued shares after the stock split	65,322,000 shares
      Total number of shares authorized to be issued after the stock split	150,000,000 shares

      ③ Schedule of the split

      Record date announcement date	September 12, 2025 (planned)
      Record date	September 30, 2025
      Effective date	October 1, 2025

2. Partial amendment of the Articles of Incorporation in conjunction with the stock split

   1. Reason for the amendment

      In conjunction with the stock split above, the Company will carry out a partial amendment of its Articles of Incorporation effective October 1, 2025, pursuant to the provisions of Article 184, Paragraph (2) of the Companies Act.

   2. Amendment of the Articles of Incorporation

      Current Articles of Incorporation	Proposed amendment
      (Total number of shares authorized to be issued) Article 6 The total number of the Company's shares authorized to be issued shall be 30,000,000.	(Total number of shares authorized to be issued) Article 6 The total number of the Company's shares authorized to be issued shall be 150,000,000.

   3. Schedule for the amendment

      Date of resolution of the Board of Directors	May 13 , 2025
      Effective date	October 1, 2025

3. Dividends

   For dividends, please refer to the "Notice of Dividends from Surplus (Dividend Increase) and Dividend Forecast for the Next Fiscal Year (Dividend Increase)."

4. Shareholder benefits

Shareholder benefits for FY2025 will not be affected by the stock split as they will be granted based on a record date that precedes the effective date of the stock split. For the details of the FY2025 Shareholder Benefit Program, please refer to the "Notice Concerning the FY2025 Shareholder Benefit Program" released on March 7, 2025.

* Today, the Board of Directors also passed a resolution for shareholder return measures for FY2025. For details, please refer to the following notices disclosed today: "Notice of Shareholder Returns in FY2025," "Notice of Dividends from Surplus (Dividend Increase) and Dividend Forecast for the Next Fiscal Year (Dividend Increase)," and "Notice of Establishment of Upper Limits and Other Terms of Acquisition of Own Shares."