Kazutoshi Isogai - 18 Mar 2026 Form 3 Insider Report for MIZUHO FINANCIAL GROUP INC (MFG)

Role: Title: Co-Head of Retail and Business Banking Company. Exhibit List: Exhibit 24 - Power of Attorney.
Signature: /s/ Yuki Nishii, as Attorney-In-Fact
Issuer symbol: MFG
Transactions as of: 18 Mar 2026
Net transactions value: $0
Form type: 3
Filing time: 18 Mar 2026, 07:00:14 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Isogai Kazutoshi	Title: Co-Head of Retail and Business Banking Company. Exhibit List: Exhibit 24 - Power of Attorney.	C/O MIZUHO FINANCIAL GROUP, INC., 1-5-5 OTEMACHI, CHIYODA-KU, TOKYO, JAPAN	/s/ Yuki Nishii, as Attorney-In-Fact	18 Mar 2026	0002116279

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	MFG	Common Stock						5,610	18 Mar 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	MFG	Phantom Stock Units - Retirement							18 Mar 2026	Common Stock	7,160		Direct	F1, F2
holding	MFG	Phantom Stock Units							18 Mar 2026	Common Stock	4,427		Direct	F2, F3
holding	MFG	Phantom Stock Units							18 Mar 2026	Common Stock	3,189		Direct	F2, F4
holding	MFG	Phantom Stock Units							18 Mar 2026	Common Stock	1,351		Direct	F2, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These phantom stock units are fully vested and settle upon the Reporting Person's retirement from the Company.
F2	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.
F3	These phantom stock units vest in three equal annual installments beginning on July 1, 2026.
F4	Represents the unvested portion of a grant of phantom stock units which vest in three equal annual installments beginning on July 1, 2025.
F5	Represents the unvested portion of a grant of phantom stock units which vest in three equal annual installments beginning on July 1, 2024.

Remarks:

Title: Co-Head of Retail and Business Banking Company. Exhibit List: Exhibit 24 - Power of Attorney.