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 August 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NO. 333-282497) AND TO BE A PART OF SUCH PROSPECTUS FROM THE DATE ON WHICH THIS REPORT IS FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.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.

 

August 14, 2026

To whom it may concern:

 

Announcement regarding Capital Ratio as of June 30, 2026

Mizuho Financial Group, Inc. hereby announces Capital Ratio as of June 30, 2026, as shown in the appendix.

Capital Ratio

 

		Consolidated								(%, Billions of yen)
Mizuho Financial Group International Standard		As of June 30, 2026				Change				As of March 31, 2026
(1)   Total Capital Ratio			17.74				0.13				17.61
(2)   Tier 1 Capital Ratio			15.94				0.21				15.73
(3)   Common Equity Tier 1 Capital Ratio			13.51				0.35				13.16
(4)   Total Capital			14,590.7				337.9				14,252.8
(5)   Tier 1 Capital			13,107.9				374.3				12,733.5
(6)   Common Equity Tier 1 Capital			11,110.0				459.5				10,650.5
(7)   Risk-weighted Assets			82,213.7				1,288.4				80,925.3
(8)   Total Required Capital (7)x8%			6,577.1				103.0				6,474.0
		Consolidated												Non-Consolidated
Mizuho Bank International Standard		As of June 30, 2026				Change				As of March 31, 2026				As of June 30, 2026
(1)   Total Capital Ratio			16.56				0.18				16.38				15.39
(2)   Tier 1 Capital Ratio			14.59				0.21				14.38				13.28
(3)   Common Equity Tier 1 Capital Ratio			11.95				0.38				11.57				10.45
(4)   Total Capital			12,546.0				384.1				12,161.9				10,818.4
(5)   Tier 1 Capital			11,054.9				381.8				10,673.0				9,333.8
(6)   Common Equity Tier 1 Capital			9,055.8				469.0				8,586.8				7,347.0
(7)   Risk-weighted Assets			75,754.9				1,549.3				74,205.5				70,274.2
(8)   Total Required Capital (7)x8%			6,060.3				123.9				5,936.4				5,621.9
		Consolidated												Non-Consolidated
Mizuho Trust & Banking Domestic Standard		As of June 30, 2026				Change				As of March 31, 2026				As of June 30, 2026
(1)   Capital Ratio			31.05				1.77				29.28				30.78
(2)   Core Capital			444.7				8.3				436.4				424.8
(3)   Risk-weighted Assets			1,432.0				(58.0	)			1,490.0				1,380.0
(4)   Total Required Capital (3)x4%			57.2				(2.3	)			59.6				55.2
		Consolidated												Non-Consolidated
Mizuho Trust & Banking International Standard (Reference)		As of June 30, 2026				Change				As of March 31, 2026				As of June 30, 2026
(1)   Total Capital Ratio			33.98				1.66				32.32				33.81
(2)   Tier 1 Capital Ratio			33.92				1.67				32.25				33.75
(3)   Common Equity Tier 1 Capital Ratio			33.92				1.68				32.24				33.75