Notice Regarding Share Repurchase (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)

6 Feb., 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 Share Repurchase

(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. Reason for the Repurchase

   The Company ranks it as an important management measure to return the profit to shareholders properly and has been committed to achieve “a total payout ratio of 60% or more (calculated based on net profit excluding the impact of inventory valuation) in the three-year cumulative period of the Medium-Term Management Plan”. Based on the progress of the financial results for the third-quarter of FY2025 announced today, the Company has decided to conduct a share repurchase with a total value of JPY 25.0 billion and will thereby achieve “a total payout ratio of 60% or more in the cumulative three-year period of the Medium-Term Management Plan”.

2. Details of Matters Concerning the Repurchase

   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)

The status of treasury shares held by the Company as of December 31, 2025:

Total number of issued and outstanding shares (including treasury shares) 165,041,722 shares Number of shares held as treasury shares 923,167 shares

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