Mizuho reveals 6.2% Launch One Acquisition Corp. stake (LPAA)

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. reported beneficial ownership of 1,429,255 common shares of Launch One Acquisition Corp., representing 6.2% of the outstanding class as of the triggering event on 12/31/2025.

Mizuho has sole power to vote and dispose of these shares and no shared voting or dispositive power. The filing states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of Launch One Acquisition Corp. Mizuho is reporting as a parent holding company, with the shares directly held by its wholly owned subsidiary Mizuho Securities USA LLC.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Launch One Acquisition Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G5S86M100

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 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 1,429,255.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,429,255.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,429,255.00

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)

6.2 %

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: 1,429,255
(b)	Percent of class: 6.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,429,255
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,429,255
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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:	02/12/2026

FAQ

What stake did Mizuho Financial Group report in Launch One Acquisition Corp. (LPAA)?

Mizuho Financial Group reported beneficial ownership of 1,429,255 common shares of Launch One Acquisition Corp., equal to 6.2% of the class. This crossing of the 5% threshold requires a Schedule 13G, disclosing Mizuho as a significant but non-controlling shareholder.

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

Mizuho Financial Group reported sole voting power over all 1,429,255 shares and no shared voting power. It also has sole dispositive power over the same number of shares, meaning it alone can decide how to vote and whether to sell these securities.

Is Mizuho’s 6.2% LPAA position intended to influence control of the company?

The certification states the securities were acquired and are held in the ordinary course of business and not for the purpose or effect of changing or influencing control of Launch One Acquisition Corp., indicating a passive investment posture under Schedule 13G.

How is Mizuho Financial Group’s ownership in LPAA structured?

The filing notes that Mizuho Financial Group, Inc., Mizuho Bank, Ltd., and Mizuho Americas LLC may be deemed indirect beneficial owners. The equity securities are directly held by Mizuho Securities USA LLC, which is described as their wholly owned subsidiary.

What type of reporting person is Mizuho in this LPAA Schedule 13G?

Mizuho Financial Group is classified as a parent holding company for this Schedule 13G. It files on the basis of indirect beneficial ownership through its wholly owned subsidiary, consistent with Rule 13d-1(b)(1)(ii)(G) treatment for parent holding companies.

When did Mizuho’s LPAA holdings trigger this Schedule 13G filing?

The date of the event requiring the filing is listed as 12/31/2025. As of that date, Mizuho Financial Group’s beneficial ownership in Launch One Acquisition Corp. reached the disclosed 1,429,255 shares, or 6.2% of the company’s common shares.