Mizuho discloses 0.1% stake in Launch One Acquisition

Mizuho Financial Group, Inc., as a parent holding company, reports beneficial ownership of common shares of Launch One Acquisition Corp..

Rhea-AI Filing Summary

Mizuho Financial Group, Inc., as a parent holding company, reports beneficial ownership of common shares of Launch One Acquisition Corp.. The group, through its wholly owned subsidiary Mizuho Securities USA LLC, holds 20,000 common shares, representing 0.1% of the class. Mizuho has sole voting and sole dispositive power over all 20,000 shares, with no shared power reported. The filing states that Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of these securities.

Key Figures

Shares beneficially owned: 20,000 shares Percent of class: 0.1 % Sole Voting Power: 20,000 +3 more

6 metrics

Shares beneficially owned 20,000 shares Amount of Launch One Acquisition Corp. common shares reported as beneficially owned

Percent of class 0.1 % Percentage of LPAA common shares represented by Mizuho’s beneficial ownership

Sole Voting Power 20,000 Number of LPAA shares over which Mizuho has sole power to vote

Sole Dispositive Power 20,000 Number of LPAA shares over which Mizuho has sole power to dispose

CUSIP G5S86M100 CUSIP number for Launch One Acquisition Corp. common shares

Certification date 08/13/2026 Date signed by Managing Director Takahiro Katsura

Key Terms

beneficial owners, Sole Voting Power, Sole Dispositive Power, Parent Holding Company, +1 more

5 terms

beneficial owners financial

"may be deemed to be indirect beneficial owners of said equity securities"

Beneficial owners are the people or entities that actually enjoy the economic benefits and control of shares or other assets, even when legal title is held by someone else such as a broker, custodian or trustee. Investors pay attention because beneficial owners hold the real voting power, receive dividends and can influence strategy and takeover outcomes — like the driver of a car who uses and maintains it while the bank holds the title — so disclosure shows who truly controls and benefits.

Sole Voting Power financial

"5 | Sole Voting Power 20,000.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 20,000.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Parent Holding Company financial

"CUSIP No.: G5S86M100 | Parent Holding Company"

Schedule 13D regulatory

"information that would otherwise be disclosed in a Schedule 13D"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

FAQ

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

What stake does Mizuho Financial Group hold in LPAA according to this Schedule 13G/A?

Mizuho Financial Group reports beneficial ownership of 20,000 common shares of Launch One Acquisition Corp. (LPAA), representing 0.1% of the outstanding class. All of these shares are held through its wholly owned subsidiary Mizuho Securities USA LLC.

Does Mizuho Financial Group have voting control over its LPAA shares?

Yes. Mizuho Financial Group reports sole voting power over 20,000 shares of LPAA and no shared voting power. It also reports sole dispositive power over the same 20,000 shares, indicating exclusive authority to vote and dispose of these shares.

How is Mizuho’s ownership in LPAA structured among its subsidiaries?

The 20,000 LPAA shares are directly held by Mizuho Securities USA LLC, a wholly owned subsidiary. Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of these equity securities under the filing’s disclosure.

Is Mizuho Financial Group considered a large shareholder of LPAA?

No. The filing states that Mizuho Financial Group’s beneficial ownership of LPAA common shares is 0.1% of the class, and it is categorized under “Ownership of 5 percent or less of a class”, indicating a relatively small holding.

What type of reporting entity is Mizuho Financial Group in this LPAA filing?

Mizuho Financial Group is identified as a Parent Holding Company in this LPAA ownership report. It certifies that the foreign regulatory scheme applicable to it is substantially comparable to that of functionally equivalent U.S. institutions for this type of ownership disclosure.

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

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Available on EDGAR 08/13/2026 - 06:28 AM Accepted by SEC EDGAR 08/13/2026 - 06:27 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)

Launch One Acquisition Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G5S86M100

(CUSIP Number)

06/30/2026

(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): G5S86M100

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 20,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 20,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

20,000.00

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)

0.1 %

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: Launch One Acquisition Corp.
(b)	Address of issuer's principal executive offices: 180 GRAND AVENUE, SUITE 1530, OAKLAND, CA 94612
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.: G5S86M100
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: 20,000
(b)	Percent of class: 0.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 20,000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 20,000
	(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:	08/13/2026