[Form 4] MIZUHO FINANCIAL GROUP INC Insider Trading Activity

Rhea-AI Filing Summary

Mizuho Financial Group Group Chief Financial Officer Makoto Samejima reported compensation-related share transactions. He exercised 1,703 phantom stock units into an equal number of common shares, fully settling this derivative award. On the same date, he disposed of 682 common shares back to the issuer in a transaction labeled as a disposition to the company. After these moves, he directly holds 4,211 common shares. Footnotes explain that each phantom stock unit represented a contingent right to one common share, settled in cash or stock at the issuer’s election, and that a portion of the units vested and was settled in cash using a reference price of JPY 7,185 per share and an exchange rate of JPY 1 to U.S. $0.006279041.

Insider Trade Summary

1,703 shares exercised/converted

Mixed 3 txns

Insider Samejima Makoto

Role Group Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Phantom Stock Units	1,703	$0.00	--
Exercise	Common Stock	1,703	$0.00	--
Disposition	Common Stock	682	$30,768.37	$20.98M

Holdings After Transaction: Phantom Stock Units — 0 shares (Direct, null); Common Stock — 4,893 shares (Direct, null)

Footnotes (1)

1. Each phantom stock unit represents a contingent right to receive one share of Issuer Common Stock, which will be settled in cash or common stock upon settlement at the Issuer's election. Represents the portion of the phantom stock units that vested and being settled in cash. The price reported herein was converted from Japanese yen to United States dollars at a conversion price of JPY 1 to U.S. $0.006279041. These shares were disposed of at a price per share of JPY 7,185. These phantom stock units vested on June 1, 2026.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Samejima Makoto

(Last) (First) (Middle)

C/O MIZUHO FINANCIAL GROUP, INC.

1-5-5 OTEMACHI, CHIYODA-KU

(Street)

TOKYO JAPAN 100-8176

(City) (State) (Zip)

JAPAN

(Country)

2. Issuer Name and Ticker or Trading Symbol
MIZUHO FINANCIAL GROUP INC [ MFG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Group Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/01/2026		M(1)		1,703	A	$0	4,893	D
Common Stock	06/01/2026		D(1)		682	D	$30,768.37(2)	4,211	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Phantom Stock Units	(1)	06/01/2026		M			1,703	(3)	(3)	Common Stock	1,703	$0	0	D

Explanation of Responses:

1. Each phantom stock unit represents a contingent right to receive one share of Issuer Common Stock, which will be settled in cash or common stock upon settlement at the Issuer's election.

2. Represents the portion of the phantom stock units that vested and being settled in cash. The price reported herein was converted from Japanese yen to United States dollars at a conversion price of JPY 1 to U.S. $0.006279041. These shares were disposed of at a price per share of JPY 7,185.

3. These phantom stock units vested on June 1, 2026.

	/s/ Yuki Nishii, as Attorney-In-Fact	06/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)