Mizuho Financial (NYSE: MFG) details progress on ¥100,000,000,000 buyback

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. reported progress on its ongoing share repurchase program authorized under the Companies Act of Japan and its Articles of Incorporation. Between May 18, 2026 and May 31, 2026, the company repurchased 2,085,100 shares of common stock for a total of ¥14,800,736,200 through market purchases utilizing a trust method. The current authorization permits repurchases of up to 25,000,000 shares, equal to 1.0% of total shares outstanding excluding treasury stock as of March 31, 2026, for an aggregate amount of up to ¥100,000,000,000 during the period from May 18, 2026 to August 31, 2026.

Insights

Equity capital markets analyst

Mizuho is executing a modest, pre-authorized share repurchase program.

Mizuho Financial Group is buying back common shares under an existing authorization of up to 25,000,000 shares and ¥100,000,000,000. In the initial phase through May 31, 2026, it has repurchased 2,085,100 shares for ¥14,800,736,200 using market purchases via a trust method.

Share repurchases reduce shares in the market and are often used to adjust capital levels or return capital to shareholders, but this program is capped at 1.0% of total shares outstanding excluding treasury stock as of March 31, 2026. The overall effect will depend on how much of the authorized amount is ultimately used by August 31, 2026.

Key Figures

Shares repurchased (period): 2,085,100 shares Amount spent on repurchase (period): ¥14,800,736,200 Maximum shares authorized: 25,000,000 shares +3 more

6 metrics

Shares repurchased (period) 2,085,100 shares Repurchased from May 18, 2026 to May 31, 2026

Amount spent on repurchase (period) ¥14,800,736,200 Consideration for 2,085,100 shares repurchased in May 2026

Maximum shares authorized 25,000,000 shares Up to 1.0% of total shares outstanding excluding treasury stock as of March 31, 2026

Maximum repurchase amount ¥100,000,000,000 Cap for current buyback authorization

Repurchase authorization period May 18, 2026 to August 31, 2026 Overall window for current buyback program

Legal basis Article 156 and Article 459 of Companies Act Japanese Companies Act provisions referenced for buyback

Key Terms

trust method, treasury stock, Companies Act of Japan, forward-looking statements, +1 more

5 terms

trust method financial

"Repurchase method | | Market purchase utilizing trust method"

treasury stock financial

"1.0% of total shares outstanding excluding treasury stock as of March 31, 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"

forward-looking statements regulatory

"This immediate release contains statements that constitute forward-looking statements within the meaning"

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.

Articles of Incorporation regulatory

"in accordance with the provisions of Article 459, Paragraph 1 of the Companies Act 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.

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Form 6-K: How Foreign Companies Report to the SEC →

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

June 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		2,085,100 shares
(3) Aggregate repurchase price		¥14,800,736,200
(4) Repurchase period		May 18, 2026 to May 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)

(1) Stock to be repurchased		MHFG common stock
(2) Aggregate shares to be repurchased		Up to a maximum of 25,000,000 shares
		(1.0% of total shares outstanding excluding treasury stock as of March 31, 2026)
(3) Aggregate amount of repurchase price		Up to a maximum of ¥100,000,000,000
(4) Repurchase period		From May 18, 2026 to August 31, 2026
(5) Repurchase method		Market purchase utilizing trust method

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

Aggregate number of shares repurchased		2,085,100 shares
Aggregate amount repurchased:		¥14,800,736,200

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.

FAQ

What share repurchase did Mizuho Financial Group (MFG) report in this update?

Mizuho Financial Group reported that it repurchased 2,085,100 shares of its common stock. These shares were bought in the market between May 18 and May 31, 2026, for a total consideration of ¥14,800,736,200 under its existing buyback authorization.

What is the total size of Mizuho Financial Group (MFG)’s authorized share buyback?

The authorized share repurchase allows Mizuho Financial Group to buy back up to 25,000,000 common shares. This authorization is capped at an aggregate repurchase price of up to ¥100,000,000,000 and represents 1.0% of total shares outstanding excluding treasury stock as of March 31, 2026.

Over what period can Mizuho Financial Group (MFG) execute its current buyback program?

Mizuho Financial Group’s current buyback authorization runs from May 18, 2026 to August 31, 2026. Within this window, the company may repurchase up to 25,000,000 shares for a maximum total amount of ¥100,000,000,000 via market purchases utilizing a trust method.

How much has Mizuho Financial Group (MFG) spent so far on the 2026 share repurchase?

As of this progress report, Mizuho Financial Group has spent ¥14,800,736,200 on share repurchases. This amount corresponds to the purchase of 2,085,100 common shares during the period from May 18, 2026 to May 31, 2026, on a trade date basis.

What repurchase method is Mizuho Financial Group (MFG) using for this buyback?

Mizuho Financial Group is conducting the share repurchase through market purchases utilizing a trust method. This approach means a trust is used to execute the on-market transactions, consistent with the company’s authorized framework and the provisions of the Companies Act of Japan.