May 31, 2011
To whom it may concern:

Company Name: Mizuho Financial Group, Inc.
Representative: Takashi Tsukamoto
President & CEO
Head Office: 2-5-1 Marunouchi
Chiyoda-ku, Tokyo
Code Number: 8411 (TSE・OSE 1st Sec.)

Company Name: Mizuho Bank, Ltd.
Representative: Satoru Nishibori
President & CEO
Head Office: 1-1-5, Uchisaiwaicho
Chiyoda-ku, Tokyo

Administrative Order from the Financial Services Agency With Respect to the Recent
Computer System Failures

Mizuho Financial Group, Inc. (“MHFG”) and Mizuho Bank, Ltd. (“MHBK”), today received a
business improvement order from the Financial Services Agency (“FSA”) with respect to the recent
computer system failures.

We would like to reiterate our deepest and sincerest apologies to all of our customers and to
everyone who have experienced any inconvenience thorough the recent computer system failures
which we have caused while Japan was experiencing difficult times after the Great Eastern Japan
Earthquake.

MHFG and its group companies (“Mizuho Group”) will rigidly implement plans for improvements
and counter-measures in surely preventing computer system failures from occurring again, and all
officers and employees of Mizuho Group will go back to the basics of “customer first policy” in
order to regain the confidence of all of our customers as well as society as a whole.

We will be making a further announcement regarding specific plans for improvements and
counter-measures at a later date.

Main points of Administrative Order

MHFG – In accordance with the provisions of Article 52-33 (1) of the Banking Act:
1. To implement promptly the plan for improvements on business prepared by MHFG.
2. To examine the necessity of additional plans for improvements on business. To
prepare additional plans and implement those promptly, in cases where they are
necessary for business improvement.
3. To verify the result of the full re-examination of system risk by MHBK, and prepare
and implement the plan for improvement as a whole group based on the verification.
4. To review the strategy on computer system.
5. To strengthen the management framework and review the human resource
management of group companies.
6. To clarify responsibilities.
7. To submit the improvement plan for implementing the above orders by the end of
June and report the progress in the implementation of the plan periodically.

MHBK - In accordance with the provisions of Article 26 (1) of the Banking Act:
1. To implement promptly the counter-measures prepared by MHBK.
2. To examine the necessity of additional counter-measures. To prepare additional
counter-measures and implement those promptly, in cases where they are necessary
for business improvement.
3. To fully re-examine system risk, and prepare and implement the necessary plans for
improvement based on the re-examination.
4. To take all possible measures to ensure appropriate customer relations.
5. To clarify responsibilities.
6. To submit the improvement plan for implementing the above orders by the end of
June and report the progress in the implementation of the plan periodically.

EOD