Notice Regarding Shares Repurchase through off-floor trading on Tokyo Stock Exchange (ToSTNeT-3) (Repurchase of its own Shares Pursuant to the Provisions of the Articles of Incorporation Pursuant to Paragraph 2 of Article 165 of the Companies Act)

February 6, 2026

To whom it may concern:

Name of the Company: Cosmo Energy Holdings Company, Limited

(Code: 5021 Shares Traded: TSE Prime section) Name of Representative: Shigeru Yamada,

Representative Director, Group CEO Name of Contact Person: Masahiro Oikawa,

General Manager of Corporate Communication Dept.

TEL +81-3-6743-7538

Notice Regarding Shares Repurchase through off-floor trading on Tokyo Stock Exchange (ToSTNeT-3) (Repurchase of its own Shares Pursuant to the Provisions of the Articles of Incorporation Pursuant to  Paragraph 2 of Article 165 of the Companies Act)

COSMO ENERGY HOLDINGS COMPANY, LIMITED (the “Company”) hereby announces that the Company has made a resolution at its Board of Directors Meeting held today, February 6, 2026, to repurchase its own shares, pursuant to Article 156 of the Companies Act of Japan as applicable through Article 165, Paragraph 3 of the Act, as follows.

1. Method of the Repurchases

   At the closing price of 4,718 yen today (February 6, 2026), the Company will consign the purchase in the off-floor trading on the Tokyo Stock Exchange (ToSTNeT-3) at 8:45 a.m. on February 9, 2026 (no other changes to the trading system or trading hours are made). The order to repurchase shall be valid only for the time mentioned above.

2. Details of share repurchases

   1. Type of Shares to be Repurchased : Common shares

   2. Total Number of Shares to be Repurchased : 4, 451, 000 shares (maximum limit)

   3. Aggregate Value of Repurchases : JPY 21.0 billion (maximum limit)

   4. Announcement of Repurchase Results : After closing of trading at 8:45 a.m. on February 9, 2026

Details of the Repurchase of its own shares resolved at the Board of Directors meeting held on February 6, 2026

1. Type of Shares to be Repurchased : Common shares

2. Total Number of Shares to be Repurchased : 6,250,000 shares (maximum limit)

   (Ratio of the total number of issued and outstanding shares [excluding treasury shares]: 3.81％)

3. Aggregate Value of Repurchases : JPY 25.0 billion (maximum limit)

4. Repurchase Period : February 9, 2026 - March 31, 2026

5. Repurchase Method:

   1. Purchase through off-floor trading on Tokyo Stock Exchange (ToSTNeT-3)

   2. Purchase by means of market trades on the Tokyo Stock Exchange

(By means of market trades based on a discretionary investment contract with a securities firm)

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