Cosmo Energy Holdings Co., Ltd.TSE: 5021

Notice of Acquisition Results of Treasury Shares and Completion of Share Repurchases (Acquisition of Treasury Shares Pursuant to the Provisions of the Articles of Incorporation Pursuant to Paragraph 3 of Article 165 of the Companies Act)

· Issued by Cosmo Energy Holdings Co., Ltd.

To whom it may concern:

Marh 12, 2026

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 of Acquisition Results of Treasury Shares and Completion of Share Repurchases (Acquisition of Treasury Shares Pursuant to the Provisions of the Articles of Incorporation Pursuant to Paragraph 3 of Article 165 of the Companies Act)

COSMO ENERGY HOLDINGS COMPANY, LIMITED (hereinafter referred to as the “Company”) hereby announces that it has completed the acquisition of treasury shares as described below, which was conducted pursuant to Article 156 of the Companies Act as applied by substitution under Article 165, Paragraph 3 of that Act. We hereby also announce that this concludes the acquisition of treasury shares authorized by the resolution of the Board of Directors meeting held on February 6, 2026.

  1. Results of Treasury Shares Acquisition in March 2026

    1. Type of Shares Repurchased : Common shares

    2. Total Number of Shares Repurchased : 647,700 shares

    3. Total Value of Shares Repurchases : 2,925,496,900 yen

    4. Repurchase Period : March 1, 2026 - March 11, 2026

  2. Cumulative treasury shares acquired by March 2026 (as of March 11, 2026) Total Number of shares repurchased : 5,328,900 shares

    Total Value of shares repurchased : 24,999,743,300 yen

    Details of Resolution of Board of Directors 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 Shares Exchange (ToSTNeT-3)

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

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

End

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