- 1 -
Note: This press release does not constitute an offer of any securities for sale. This press release has been prepared for the sole purpose of
publicly announcing the matters relating to the issuance of new shares, and not for the purpose of soliciting investment or engaging in any other similar activities within or outside Japan. Investors should carefully review a prospectus prepared by MHFG prior to making any investment decisions.

This press release is not an offer of securities for sale in the United States. The securities referred to above have not been, and will not be registered under the U.S. Securities Act of 1933. The securities may not be offered or sold in the United States absent registration or an exemption from registration under the U.S. Securities Act of 1933. The securities referred to above will not be publicly offered or sold in the United States.

July 21, 2009
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 1st Sec., OSE 1st Sec.)

Announcement regarding Determination of Number of Shares
to be Issued in the Offering

Mizuho Financial Group, Inc. (“MHFG”) hereby announces that it has determined the following number of shares to be issued as a result of the exercise of a purchase option granted to the International Initial Purchaser in the International Offering for the purchase of the shares to be additionally issued, with respect to the Issuance of New Shares by way of Offering (Public Offering) which is a part of the issuance of new shares which was resolved at the meeting of the Board of Directors held on July 1, 2009. Number of shares to be issued as a result of the exercise of the purchase option by the International Initial Purchaser: 195,600,000
shares

- 2 -
Note: This press release does not constitute an offer of any securities for sale. This press release has been prepared for the sole purpose of
publicly announcing the matters relating to the issuance of new shares, and not for the purpose of soliciting investment or engaging in any other similar activities within or outside Japan. Investors should carefully review a prospectus prepared by MHFG prior to making any investment decisions.

This press release is not an offer of securities for sale in the United States. The securities referred to above have not been, and will not be registered under the U.S. Securities Act of 1933. The securities may not be offered or sold in the United States absent registration or an exemption from registration under the U.S. Securities Act of 1933. The securities referred to above will not be publicly offered or sold in the United States.

[For Reference]
1. The number of shares to be issued relating to the Issuance of New Shares by way of Offering (Public
Offering)

2,804,400,000 shares of common stock of MHFG which are the sum of (1) and (2) below.
(1) 2,608,800,000 shares to be underwritten and purchased by the Japanese Initial Purchaser and the
International Initial Purchaser in each of the offerings specified below. (i) Japanese Public Offering
1,304,400,000 shares
(ii) International Offering
1,304,400,000 shares

(2) 195,600,000 shares to be issued by the exercise of the purchase options granted to the International
Initial Purchaser in the International Offering for the purchase of the shares to be additionally issued
2. Change in the number of issued shares as a result of this capital increase by public offering
Total number of issued shares at present (as of June 30, 2009):
Common Stock:
11,179,164,300 shares

Eleventh Series Class XI Preferred Stock:
914,752,000 shares

Thirteenth Series Class XIII Preferred Stock:
36,690,000 shares
Total:
12,130,606,300
shares
Increase in number of shares as a result of the capital increase by public offering:
Common Stock:
2,804,400,000 shares
Total number of issued shares after the capital increase by public offering:
Common Stock:
13,983,564,300 shares

Eleventh Series of Class XI Preferred Stock:
914,752,000 shares

Thirteenth Series Class XIII Preferred Stock:
36,690,000 shares
Total:
14,935,006,300
shares
3. Use of proceeds
The maximum approximate net proceeds of ¥ 526,379,000,000 (the total amount of ¥ 228,853,160,000, which is the approximate net proceeds from the Japanese Public Offering, ¥ 263,197,000,000, which is the approximate net proceeds from the International Offering and ¥ 34,328,840,000, which is the maximum approximate net proceeds from capital increase by way of third-party allotment resolved on the same date as the Japanese Public Offering and the International Offering) are planned to be used to make investments in MHFG’s consolidated subsidiaries.