Mizuho files 13G/A showing 0 shares of M3‑Brigade

Rhea-AI Filing Summary

Mizuho Financial Group filed an Amendment (Schedule 13G/A) reporting 0 common shares of M3-Brigade Acquisition V Corp. The filing states 0 shares beneficially owned representing 0.0% of the class and identifies Mizuho Securities USA LLC as the subsidiary holding the securities. The filing is signed by Takahiro Katsura on 05/14/2026.

Insights

Compliance Counsel

Amendment documents passive, non‑beneficial ownership by a parent holding company.

The filing is a Schedule 13G/A amendment that records 0 shares and 0.0% beneficial ownership in M3‑Brigade Acquisition V Corp., and includes an exhibit reference identifying the acquiring subsidiary. The signature block certifies comparability of the foreign regulatory scheme.

This is administrative: the change does not create ownership or voting influence. Subsequent filings would be required only if beneficial ownership thresholds are met.

Investor Relations Analyst

Notes a disclosure path rather than an investment position; no market exposure reported.

The document clarifies that Mizuho entities may be indirect owners through Mizuho Securities USA LLC but reports no beneficial ownership. The filing cites the CUSIP G63212107 and lists the issuer's principal office address.

For investors, the filing signals no current ownership over the quoted shares; any material change would appear in later beneficial‑ownership disclosures.

Key Figures

Beneficially owned: 0 shares Percent of class: 0.0% CUSIP: G63212107 +3 more

6 metrics

Beneficially owned 0 shares Schedule 13G/A reporting line

Percent of class 0.0% Schedule 13G/A reporting line

CUSIP G63212107 M3‑Brigade Acquisition V Corp. common shares

Issuer address 1700 Broadway, 19th Floor, New York, NY Issuer principal executive offices

Filing signature date 05/14/2026 Signature block by Takahiro Katsura

Report date noted 03/31/2026 Date line adjacent to CUSIP on cover

Key Terms

Schedule 13G/A, Parent Holding Company, Beneficially owned

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 / Schedule 13G/A filing for beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Parent Holding Company regulatory

"Parent Holding Company Item 4 and Item 7 references"

Beneficially owned regulatory

"Item 4(a) Amount beneficially owned: 0"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Mizuho's Schedule 13G/A say about MBAV ownership?

It states 0 shares beneficially owned of M3‑Brigade Acquisition V Corp., representing 0.0% of the class. The filing lists the subsidiary Mizuho Securities USA LLC in the ownership discussion.

Who signed the amendment for Mizuho and when?

The amendment is signed by Takahiro Katsura, Managing Director, on 05/14/2026. The filing includes a certification about the foreign regulatory scheme comparability.

Which CUSIP and issuer are referenced in the filing?

The filing references CUSIP G63212107 for M3‑Brigade Acquisition V Corp. and provides the issuer's principal office at 1700 Broadway, 19th Floor, New York, NY.

Does the filing indicate Mizuho controls any voting power in MBAV?

No. The Schedule reports 0 sole and 0 shared voting power and 0 sole and 0 shared dispositive power over the reported class of securities.

Why does a parent holding company file this schedule?

The filing identifies Mizuho Financial Group as a parent holding company and attaches exhibitory information about the subsidiary that holds the securities, per schedule requirements.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 06:24 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

M3-Brigade Acquisition V Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G63212107

(CUSIP Number)

03/31/2026

(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): G63212107

1

Names of Reporting Persons

Mizuho Financial 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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0.0 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed to be indirect beneficial owners of said equity securities directly held by Mizuho Securities USA LLC which is their wholly-owned subsidiary.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: M3-Brigade Acquisition V Corp.
(b)	Address of issuer's principal executive offices: 1700 Broadway 19th Floor New York, NY, 10019
Item 2.
(a)	Name of person filing: Mizuho Financial Group, Inc.
(b)	Address or principal business office or, if none, residence: 1-5-5, Otemachi, Chiyoda-ku, Tokyo, 100-8176, Japan
(c)	Citizenship: Japan
(d)	Title of class of securities: Common Shares
(e)	CUSIP No.: G63212107
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: 0
(b)	Percent of class: 0.0 %
(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: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
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. See Exhibit A
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
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. By signing below I certify that, to the best of my knowledge and belief, the foreign regulatory scheme applicable to Parent Holding Company is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

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.

Mizuho Financial Group, Inc.

Signature:	/s/ Takahiro Katsura
Name/Title:	Takahiro Katsura, Managing Director, Global Corporate Function Coordination Department
Date:	05/14/2026