Mizuho buys back ¥75.7B in stock in August

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. (MFG) reports progress on its ongoing common stock repurchase authorized under the Companies Act of Japan and its Articles of Incorporation. During the period from August 1–31, 2026, the company repurchased 9,078,600 common shares for an aggregate price of ¥75,678,470,200 through market purchases utilizing a trust method.

The repurchase is part of a previously announced program to buy back up to 35,000,000 shares of common stock, representing 1.4% of total shares outstanding excluding treasury stock as of June 30, 2026, for up to ¥200,000,000,000, over the period from May 18, 2026 to September 30, 2026. Cumulatively under this program, Mizuho has repurchased 18,226,400 shares for a total of ¥147,065,069,600.

Positive

• Significant share repurchase activity: Under a program of up to 35,000,000 shares (1.4% of shares outstanding) and ¥200,000,000,000, Mizuho has already repurchased 18,226,400 shares for ¥147,065,069,600, signaling active capital return to shareholders.

Negative

• None.

Filing Explained

As a Form 6-K, this September 1 filing furnishes interim information and is incorporated by reference into Mizuho’s Form F-3 prospectus, making the repurchase update part of that prospectus unless later documents supersede it.

Key Figures

Shares repurchased in August 2026: 9,078,600 shares Aggregate repurchase price in August 2026: ¥75,678,470,200 Maximum shares authorized for repurchase: 35,000,000 shares +5 more

8 metrics

Shares repurchased in August 2026 9,078,600 shares MHFG common stock repurchased from August 1, 2026 to August 31, 2026

Aggregate repurchase price in August 2026 ¥75,678,470,200 Cost of MHFG common stock repurchased August 1–31, 2026

Maximum shares authorized for repurchase 35,000,000 shares Up to 1.4% of total shares outstanding excluding treasury stock as of June 30, 2026

Maximum aggregate repurchase amount ¥200,000,000,000 Ceiling for the current share repurchase program

Cumulative shares repurchased under program 18,226,400 shares Aggregate number of shares repurchased as referenced in the notice

Cumulative repurchase amount under program ¥147,065,069,600 Aggregate amount paid for shares repurchased under the program

Repurchase period for authorization May 18, 2026 to September 30, 2026 Authorized timeframe for market purchases utilizing trust method

Percent of shares outstanding target 1.4% Proportion of total shares outstanding excluding treasury stock as of June 30, 2026

Key Terms

trust method, treasury stock, Companies Act of Japan, Articles of Incorporation, +1 more

5 terms

trust method financial

"Repurchase method | | Market purchase utilizing trust method"

treasury stock financial

"1.4% of total shares outstanding excluding treasury stock as of June 30, 2026"

Treasury stock is shares that a company has bought back from the public and kept in its own control rather than retiring them. Think of it like a company holding its own tickets in a drawer: those shares no longer vote or receive dividends while held, but the company can reissue or retire them later; this reduces the number of shares available to outside investors and can boost per‑share earnings and influence ownership and stock price.

Companies Act of Japan regulatory

"pursuant to the provisions of Article 156, Paragraph 1 of the Companies Act of Japan"

Articles of Incorporation regulatory

"in accordance with the provisions of Article 459, Paragraph 1 ... and the Articles of Incorporation"

A formal legal document filed with a government authority that creates a corporation and sets its basic rules — for example the company name, business purpose, how many ownership shares can exist, and who can receive legal notices. It matters to investors because it defines ownership structure, voting rights, and limits on liability, shaping who controls the company and how future shares or dividends can affect an investor’s stake; think of it as the company’s birth certificate and rulebook.

forward-looking statements regulatory

"This immediate release contains statements that constitute forward-looking statements"

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

FAQ

What share repurchase did Mizuho Financial Group (MFG) complete in August 2026?

Mizuho Financial Group repurchased 9,078,600 common shares in August 2026 for an aggregate price of ¥75,678,470,200, using market purchases through a trust method, as part of its ongoing authorized buyback program.

What is the total size of Mizuho Financial Group (MFG)’s current share repurchase program?

The current program authorizes repurchases of up to 35,000,000 common shares, equal to 1.4% of total shares outstanding excluding treasury stock as of June 30, 2026, for an aggregate amount of up to ¥200,000,000,000.

How much has Mizuho Financial Group (MFG) repurchased cumulatively under this program?

Cumulatively under the current authorization, Mizuho Financial Group has repurchased 18,226,400 common shares for a total aggregate amount of ¥147,065,069,600 via market purchases utilizing a trust method.

What is the authorized period for Mizuho Financial Group (MFG)’s share repurchase program?

The authorized period for the current share repurchase program runs from May 18, 2026 to September 30, 2026. Repurchases are conducted as market purchases utilizing a trust method during this timeframe.

How is this 6-K related to Mizuho Financial Group (MFG)’s Form F-3 registration statement?

The report is deemed incorporated by reference into the prospectus forming part of Mizuho Financial Group’s Form F-3 registration statement (File No. 333-282497) and becomes part of that prospectus from the date it is furnished, unless later filings supersede it.

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Available on EDGAR 09/01/2026 - 06:08 AM Accepted by SEC EDGAR 09/01/2026 - 06:03 AM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number 001-33098

Mizuho Financial Group, Inc.

(Translation of registrant’s name into English)

5-5, Otemachi 1-chome

Chiyoda-ku, Tokyo 100-8176

Japan

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐

THIS REPORT ON FORM 6-K SHALL BE DEEMED TO BE INCORPORATED BY REFERENCE INTO THE PROSPECTUS FORMING A PART OF MIZUHO FINANCIAL GROUP, INC.’S REGISTRATION STATEMENT ON FORM F-3 (FILE NO. 333-282497) AND TO BE A PART OF SUCH PROSPECTUS FROM THE DATE ON WHICH THIS REPORT IS FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

				Date: September 1, 2026 Mizuho Financial Group, Inc.
				By:		/s/ Makoto Samejima
				Name:		Makoto Samejima
				Title:		Senior Managing Corporate Executive / Group CFO

September 1, 2026

		Company Name:		Mizuho Financial Group, Inc.
		Representative:		Masahiro Kihara, President and Group CEO
		Head Office:		1-5-5 Otemachi, Chiyoda-ku, Tokyo
		Code Number:		8411 (Prime Market of Tokyo Stock Exchange)

Notice regarding Progress of Repurchase of Our Common Stock

(Repurchase of our common stock pursuant to the provisions of Article 156, Paragraph 1 of the Companies Act, in accordance with the provisions of Article 459, Paragraph 1 of the Companies Act and the Articles of Incorporation of Mizuho Financial Group, Inc.)

Mizuho Financial Group, Inc. (“MHFG”) hereby announces the progress of the repurchase of its common stock pursuant to the provisions of Article 156, Paragraph 1 of the Companies Act of Japan (“Companies Act”) and in accordance with the provisions of Article 459, Paragraph 1 of the Companies Act and Article 47 of its Articles of Incorporation.

(1) Stock repurchased		MHFG common stock
(2) Aggregate shares repurchased		9,078,600 shares
(3) Aggregate repurchase price		¥75,678,470,200
(4) Repurchase period		August 1, 2026 to August 31, 2026 (trade date basis)
(5) Repurchase method		Market purchase utilizing trust method

(Reference)

1. Outline of the resolution of the meeting of the Board of Directors regarding the repurchase of common stock (May 15, 2026 and July 30, 2026)

(1) Stock to be repurchased		MHFG common stock
(2) Aggregate shares to be repurchased		Up to a maximum of 35,000,000 shares
		(1.4% of total shares outstanding excluding treasury stock as of June 30, 2026)
(3) Aggregate amount of repurchase price		Up to a maximum of ¥200,000,000,000
(4) Repurchase period		From May 18, 2026 to September 30, 2026
(5) Repurchase method		Market purchase utilizing trust method

2. Aggregate number of shares and amount repurchased pursuant to the above resolution as of August 31, 2026

Aggregate number of shares repurchased		18,226,400 shares
Aggregate amount repurchased:		¥147,065,069,600

End of document

This immediate release contains statements that constitute forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995, including estimates, forecasts, targets and plans. Such forward-looking statements do not represent any guarantee by management of future performance. Factors that could affect our financial condition and results of operations are included in “Item 3.D. Key Information—Risk Factors” and “Item 5. Operating and Financial Review and Prospects” in our most recent Form 20-F filed with the U.S. Securities and Exchange Commission (“SEC”), which is available in the Financial Information section of our web page at www.mizuhogroup.com and also at the SEC’s web site at www.sec.gov. We are under no obligation, and disclaim any obligation, to update or alter our forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required by the rules of the Tokyo Stock Exchange.