JAPAN POST BANK : Notice Concerning Share Repurchase in the open market under discretionary transaction contracts with respect to the repurchase of shares

December 24, 2025

Company Name: JAPAN POST BANK Co., Ltd.

Representative: KASAMA Takayuki, President & CEO, Representative Executive Officer Member of the Board of Directors

(Securities Code: 7182, Tokyo Stock Exchange Prime Market)

Notice Concerning Share Repurchase in the open market under discretionary transaction contracts with respect to the repurchase of shares

JAPAN POST BANK Co., Ltd. (the "Company") hereby announces that it has determined the details of the repurchase of the Company's shares (common stock of the Company) in the open market under discretionary transaction contracts with respect to the repurchase of shares (the "Market Share Repurchase"), which it resolved at the Board of Directors meeting held on December 23, 2025 in accordance with Article 156, Paragraph 1 of the Companies Act under Article 39, Paragraph 1 of the Articles of Incorporation complying with Article 459, Paragraph 1, Item 1 of the Companies Act, as described below.

1. Class of shares to be repurchased: Common stock of the Company

2. Total number of shares to be repurchased: 7,088,300 shares (maximum)

   (The ratio of the total number of shares to be repurchased to the total number of shares issued (excluding treasury stock): 0.2%)

3. Aggregate repurchase price of shares to be repurchased: 15,000,050,000 yen (maximum)

4. Repurchase period: From Monday, January 5, 2026 to Tuesday, March 24, 2026

5. Method of repurchase: Market purchases under discretionary transaction contracts with respect to the repurchase of shares

(Note 1) The Market Share Repurchases are implemented before the annual accounts for the fiscal year ending March 31, 2026 are approved. Under the Companies Act, the Company can repurchase its own shares if it is reasonably determined unlikely that the distributable amount at the end of the fiscal year that includes the date of such share repurchase will be a deficit. Although the Company currently has sufficient distributable amount to conduct the Share Repurchases after the share repurchase of 14,999,950,000yen through the off-auction own share repurchase trading on the Tokyo Stock Exchange Trading NeTwork system (ToSTNeT-3) on December 24, 2025, there is a possibility that the Share Repurchases will not be conducted in whole or in part, if it is no longer possible to reasonably expect that the necessary distributable amount will be available at the end of March 2026 due to the occurrence of significant fluctuations or disruptions in the financial markets, such as a sharp decline in the share prices of companies listed on Tokyo Stock Exchange, the

rapid appreciation of the yen, a significant rise in domestic or overseas long-term interest rates or a significant widening of overseas credit spreads, by the end of this fiscal year (the end of March 2026).

(Note 2) Since the maximum "Total number of shares to be repurchased" has been set so that the ratio of voting rights of the Company's shares held by JAPAN POST HOLDINGS Co., Ltd. will be maintained at 50% or less, the actual amount of the repurchase may be significantly less than the "Aggregate repurchase price of shares to be repurchased" above.

(Reference)

1. Details of the resolution by the Board of Directors meeting held on December 23, 2025 concerning the Share Repurchase

   1. Class of shares to be repurchased: Common stock of the Company

   2. Total number of shares to be repurchased: 23,000,000 shares (maximum)

      (The ratio of the total number of shares to be repurchased to the total number of shares issued (excluding treasury stock): 0.6%)

   3. Aggregate repurchase price of shares to be repurchased: 30.0 billion yen (maximum)

   4. Repurchase period: From Wednesday, December 24, 2025 to Tuesday, March 24, 2026

   5. Method of repurchase: Purchases through the off-auction own share repurchase trading on the Tokyo Stock Exchange Trading NeTwork system (ToSTNeT-3) and Market purchases under discretionary transaction contracts with respect to the repurchase of shares

   6. In addition to the matters as described above, any matters required for the share repurchase shall be determined at the sole discretion of the President & CEO, Representative Executive Officer of the Company.

2. Results of the share repurchase as of December 24, 2025

1. Total number of shares acquired: 7,058,800 shares

2. Total amount of shares acquired: 14,999,950,000 yen