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Mizuho Financial Group, Inc. (MFG) is the issuer in a Schedule 13G/A reporting Sumitomo Mitsui Trust Group, Inc.’s beneficial ownership of 121,591,698 common shares, or 5.0%, as of September 30, 2026. The reporting person shared voting power over 114,648,798 shares and shared dispositive power over 121,591,698 shares; it reported zero sole voting or dispositive power. Portions of the reported securities are owned or may be deemed beneficially owned by subsidiaries Sumitomo Mitsui Trust Asset Management Co., Ltd. and Amova Asset Management Co., Ltd.
Key Figures
Beneficial ownership:121,591,698 sharesPercent of class:5.0%Shared voting power:114,648,798 shares+3 more
6 metrics
Beneficial ownership121,591,698 sharesAs of September 30, 2026
Percent of class5.0%As of September 30, 2026
Shared voting power114,648,798 sharesAs of September 30, 2026
Shared dispositive power121,591,698 sharesAs of September 30, 2026
Sole voting power0 sharesAs of September 30, 2026
Sole dispositive power0 sharesAs of September 30, 2026
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
shared voting powerregulatory
"Shared power to vote or to direct the vote: 114,648,798"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
shared dispositive powerregulatory
"Shared power to dispose or to direct the disposition of: 121,591,698"
parent holding companyregulatory
"Sumitomo Mitsui Trust Group, Inc. as a parent holding company"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many MFG shares does Sumitomo Mitsui Trust Group report beneficially owning?
Sumitomo Mitsui Trust Group reported beneficial ownership of 121,591,698 Mizuho common shares, or 5.0%, as of September 30, 2026.
What voting and disposition powers does Sumitomo Mitsui Trust Group report over MFG shares?
It reports shared voting power over 114,648,798 shares and shared dispositive power over 121,591,698 shares. It reports zero sole voting power and zero sole dispositive power.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 5)
Mizuho Financial Group, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
60687Y109
(CUSIP Number)
09/30/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
60687Y109
1
Names of Reporting Persons
Sumitomo Mitsui Trust Group, Inc.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
JAPAN
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
114,648,798.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
121,591,698.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
121,591,698.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.0 %
12
Type of Reporting Person (See Instructions)
HC, FI
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Mizuho Financial Group, Inc.
(b)
Address of issuer's principal executive offices:
5-5, Otemachi 1-chome, Chiyoda-ku, Tokyo, Japan, 100-8176
Item 2.
(a)
Name of person filing:
Sumitomo Mitsui Trust Group, Inc.
(b)
Address or principal business office or, if none, residence:
1-4-1 Marunouchi, Chiyoda-ku, Tokyo 100-8233, Japan
(c)
Citizenship:
Japan
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
60687Y109
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Parent Holding Company
Item 4.
Ownership
(a)
Amount beneficially owned:
121,591,698
(b)
Percent of class:
5.0 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
0
(ii) Shared power to vote or to direct the vote:
114,648,798
(iii) Sole power to dispose or to direct the disposition of:
0
(iv) Shared power to dispose or to direct the disposition of:
121,591,698
Item 5.
Ownership of 5 Percent or Less of a Class.
Ownership of 5 percent or less of a class
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Portions of the securities being reported on by Sumitomo Mitsui Trust Group, Inc. as a parent holding company are owned, or may be deemed to be beneficially owned, by its subsidiaries: each of (a) Sumitomo Mitsui Trust Asset Management Co., Ltd. and (b) Amova Asset Management Co., Ltd. is classified as an investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E) and as a non-U.S. institution in accordance with ss.240.13d-1(b)(1)(ii)(J).In addition, Nikko Asset Management Co., Ltd. has changed the company name to Amova Asset Management Co., Ltd. as of September 1, 2025.
Item 8.
Identification and Classification of Members of the Group.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
Portions of the securities being reported on by Sumitomo Mitsui Trust Group, Inc. as a parent holding company are owned, or may be deemed to be beneficially owned, by its subsidiaries: each of (a) Sumitomo Mitsui Trust Asset Management Co., Ltd. and (b) Amova Asset Management Co., Ltd. is classified as an investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E) and as a non-U.S. institution in accordance with ss.240.13d-1(b)(1)(ii)(J). In addition, Nikko Asset Management Co., Ltd. has changed the company name to Amova Asset Management Co., Ltd. as of September 1, 2025.
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
