Mizuho (YCY) reports 643,039 shares, 5.4% stake in AA Mission II

Rhea-AI Filing Summary

Mizuho Financial Group reports a 5.4% holding in AA Mission Acquisition Corp. II. The amendment shows 643,039 common shares (CUSIP G1000S109) are beneficially owned with sole voting and dispositive power. The filing identifies the parent and a subsidiary relationship and is signed by Takahiro Katsura on 05/14/2026.

Insights

Corporate Governance Analyst

Parent holding disclosed a 5.4% stake and sole control over 643,039 shares.

The schedule amendment lists 643,039 shares as beneficially owned and notes sole voting and dispositive power; it also references a wholly-owned subsidiary as the direct holder. This filing clarifies ownership structure under parent holding company rules.

Future filings may show any change in percent ownership or disclosures required if the position crosses reportable thresholds.

Equity Ownership Specialist

Disclosure updates beneficial ownership and identifies relevant subsidiaries.

The filing attaches an exhibit reference for subsidiary identification and includes a regulatory comparability certification signed by an authorized officer. The statement ties beneficial ownership to Mizuho Securities USA LLC through the parent group.

Watch for amendments if shares are bought or sold or if the subsidiary classification changes.

Key Figures

Beneficial ownership: 643,039 shares Percent of class: 5.4% Sole voting power: 643,039 shares +2 more

5 metrics

Beneficial ownership 643,039 shares Common Shares (CUSIP G1000S109)

Percent of class 5.4% Percent of outstanding common shares

Sole voting power 643,039 shares Number of shares with sole voting power

Sole dispositive power 643,039 shares Number of shares with sole dispositive power

Signature date 05/14/2026 Signature by Takahiro Katsura

Key Terms

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

3 terms

Schedule 13G/A regulatory

"Amendment No. 1; SCHEDULE 13G/A appears in header"

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

"Item 7 references the parent holding company filing this schedule"

Beneficially owned financial

"Item 4(a) lists the amount "beneficially owned: 643,039""

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

AA Mission Acquisition Corp. II

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G1000S109

(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): G1000S109

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 643,039.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 643,039.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

643,039.00

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)

5.4 %

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: AA Mission Acquisition Corp. II
(b)	Address of issuer's principal executive offices: 21 WATERWAY AVENUE SUITE 300 #9733 THE WOODLANDS, TX 77380
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.: G1000S109
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: 643,039
(b)	Percent of class: 5.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 643,039
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 643,039
	(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:	05/14/2026

FAQ

What stake does Mizuho Financial Group hold in AA Mission Acquisition Corp. II (YCY)?

Mizuho Financial Group beneficially owns 643,039 common shares, representing 5.4% of the class, as stated in the amendment filed and signed on 05/14/2026.

Does Mizuho have voting control over these shares?

Yes. The filing states Mizuho has sole voting power over 643,039 shares and sole dispositive power over the same number of shares.

Which entity directly holds the shares reported by Mizuho?

The amendment notes the shares are directly held by Mizuho Securities USA LLC, a wholly-owned subsidiary within the Mizuho group, as described in the filing's comment section.

Who signed the Schedule 13G/A amendment for Mizuho?

The filing is signed by Takahiro Katsura, Managing Director, Global Corporate Function Coordination Department, with the signature date of 05/14/2026.

Does this filing change Mizuho's classification as a passive or control investor?

The amendment identifies Mizuho as a parent holding company with sole voting/dispositive power over the reported shares; the filing includes subsidiary identification details rather than classifying passive status.