Mizuho Financial Group (MFG) posts modest Q2 capital ratio gains; RWAs rise

Rhea-AI Filing Summary

Mizuho Financial Group reported its regulatory capital metrics as of June 30, 2025. On a consolidated basis the Total Capital Ratio rose to 17.93% (up 0.18 percentage points versus March 31, 2025), Tier 1 Capital Ratio to 15.96% (up 0.31) and Common Equity Tier 1 to 13.35% (up 0.12). Consolidated Total Capital increased by ¥320.1 billion to ¥13,075.9 billion while risk-weighted assets expanded by ¥1,067.1 billion to ¥72,911.5 billion, raising total required capital to ¥5,832.9 billion.

At the subsidiary level, Mizuho Bank reported a Total Capital Ratio of 16.50% (up 0.23) with CET1 at 11.57% (up 0.15). Mizuho Trust & Banking showed a materially higher Total Capital Ratio of 32.62% (up 1.02). The release provides quarter-end regulatory-capital snapshots without additional commentary or forward guidance.

Positive

• Consolidated Total Capital Ratio increased to 17.93% (up 0.18 percentage points)
• Tier 1 Capital Ratio rose to 15.96% (up 0.31 percentage points)
• Total consolidated capital grew by ¥320.1 billion to ¥13,075.9 billion
• Mizuho Trust & Banking reported a strong capital position with a Total Capital Ratio of 32.62% (up 1.02)

Negative

• Risk-weighted assets increased by ¥1,067.1 billion to ¥72,911.5 billion, which raises capital needs
• Total required capital rose by ¥85.3 billion to ¥5,832.9 billion, offsetting part of the ratio improvement

Insights

Financial Analyst

TL;DR: Capital ratios edged higher quarter-over-quarter; capital levels rose but RWAs also increased, keeping the change modest for valuation impact.

The consolidated Total Capital Ratio improved to 17.93% and Tier 1 to 15.96%, driven by a ¥320.1bn increase in total capital. However, risk-weighted assets grew by ¥1,067.1bn, which lifted required capital by ¥85.3bn. For investors, these figures signal a slightly stronger capital buffer but not a material shift in solvency or earnings outlook based solely on this release.

Risk Analyst

TL;DR: Solvency metrics improved modestly with higher CET1 and Tier 1; rising RWAs offset part of the improvement, increasing regulatory capital needs.

CET1 rose to 13.35% and Tier 1 to 15.96%, which supports regulatory compliance headroom. The ¥1,067.1bn rise in RWAs to ¥72,911.5bn increased the total required capital to ¥5,832.9bn, reducing the net margin of improvement. The data are material for capital adequacy monitoring but do not indicate emerging solvency stress.

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 2025

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:		August 14, 2025
Mizuho Financial Group, Inc.
By:		/s/ Takefumi Yonezawa
Name:		Takefumi Yonezawa
Title:		Senior Managing Corporate Executive / Group CFO

August 14, 2025

To whom it may concern:

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

Announcement regarding Capital Ratio as of June 30, 2025

Mizuho Financial Group, Inc. hereby announces Capital Ratio as of June 30, 2025, as shown in the appendix.

Capital Ratio

		Consolidated								(%, Billions of yen)
Mizuho Financial Group International Standard		As of June 30, 2025				Change				As of March 31, 2025
(1)   Total Capital Ratio			17.93				0.18				17.75
(2)   Tier 1 Capital Ratio			15.96				0.31				15.65
(3)   Common Equity Tier 1 Capital Ratio			13.35				0.12				13.23
(4)   Total Capital			13,075.9				320.1				12,755.7
(5)   Tier 1 Capital			11,640.3				392.1				11,248.2
(6)   Common Equity Tier 1 Capital			9,739.3				233.1				9,506.2
(7)   Risk-weighted Assets			72,911.5				1,067.1				71,844.4
(8)   Total Required Capital (7)x8%			5,832.9				85.3				5,747.5
		Consolidated												Non-Consolidated
Mizuho Bank International Standard		As of June 30, 2025				Change				As of March 31, 2025				As of June 30, 2025
(1)   Total Capital Ratio			16.50				0.23				16.27				15.67
(2)   Tier 1 Capital Ratio			14.41				0.35				14.06				13.40
(3)   Common Equity Tier 1 Capital Ratio			11.57				0.15				11.42				10.33
(4)   Total Capital			11,060.4				341.5				10,718.8				9,649.4
(5)   Tier 1 Capital			9,658.7				391.3				9,267.3				8,251.4
(6)   Common Equity Tier 1 Capital			7,756.5				227.4				7,529.0				6,359.9
(7)   Risk-weighted Assets			66,999.0				1,119.5				65,879.4				61,561.9
(8)   Total Required Capital (7)x8%			5,359.9				89.5				5,270.3				4,924.9
		Consolidated												Non-Consolidated
Mizuho Trust & Banking International Standard		As of June 30, 2025				Change				As of March 31, 2025				As of June 30, 2025
(1)   Total Capital Ratio			32.62				1.02				31.60				31.93
(2)   Tier 1 Capital Ratio			32.60				1.00				31.60				31.92
(3)   Common Equity Tier 1 Capital Ratio			32.60				1.00				31.60				31.92
(4)   Total Capital			507.4				13.5				493.9				470.5
(5)   Tier 1 Capital			507.2				13.4				493.8				470.3
(6)   Common Equity Tier 1 Capital			507.2				13.4				493.8				470.3
(7)   Risk-weighted Assets			1,555.7				(6.8	)			1,562.5				1,473.4
(8)   Total Required Capital (7)x8%			124.4				(0.5	)			125.0				117.8

FAQ

What are Mizuho's consolidated capital ratios as of June 30, 2025 (MFG)?

Consolidated Total Capital Ratio is 17.93%, Tier 1 Capital Ratio 15.96%, Common Equity Tier 1 13.35%; Total Capital is ¥13,075.9bn and RWAs are ¥72,911.5bn.

How did Mizuho's consolidated ratios change versus March 31, 2025?

Total Capital Ratio increased by 0.18 points, Tier 1 increased by 0.31, CET1 by 0.12; Total Capital rose ¥320.1bn and RWAs rose ¥1,067.1bn.

What were Mizuho Bank's capital metrics as of June 30, 2025?

Mizuho Bank reported a Total Capital Ratio of 16.50% (up 0.23), Tier 1 14.41% (up 0.35), CET1 11.57% (up 0.15); Total Capital ¥11,060.4bn, RWAs ¥66,999.0bn.

What were Mizuho Trust & Banking's capital ratios?

Mizuho Trust & Banking showed a Total Capital Ratio of 32.62% (up 1.02), Tier 1 32.60% (up 1.00), CET1 32.60% (up 1.00); Total Capital ¥507.4bn, RWAs ¥1,555.7bn.

Did required capital change in the quarter?

Yes. Consolidated total required capital rose to ¥5,832.9bn (increase of ¥85.3bn). Mizuho Bank's required capital was ¥5,359.9bn (up ¥89.5bn); Trust required capital was ¥124.4bn (down ¥0.5bn).