Mizuho reports 5.5% stake in SPACSphere Acquisition

Rhea-AI Filing Summary

Mizuho Financial Group, Inc., a Japan-based parent holding company, reports beneficial ownership of common shares of SPACSphere Acquisition Corp. Mizuho reports holding 1,012,567 common shares, representing 5.5% of the class, with sole voting and sole dispositive power over these shares and no shared power. The filing states that Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of equity securities directly held by Mizuho Securities USA LLC, their wholly owned subsidiary.

Key Figures

Beneficially owned shares: 1,012,567 shares Percent of class: 5.5% Sole voting power: 1,012,567 shares +1 more

4 metrics

Beneficially owned shares 1,012,567 shares Common shares of SPACSphere Acquisition Corp. reported by Mizuho Financial Group, Inc.

Percent of class 5.5% Portion of SPACSphere Acquisition Corp. common share class owned by Mizuho

Sole voting power 1,012,567 shares Shares over which Mizuho has sole power to vote or direct the vote

Sole dispositive power 1,012,567 shares Shares over which Mizuho has sole power to dispose or direct disposition

Key Terms

beneficially owned, sole power to vote, dispositive power, Parent Holding Company, +1 more

5 terms

beneficially owned financial

"Ownership (a) | Amount beneficially owned: 1,012,567"

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.

sole power to vote financial

"Sole power to vote or to direct the vote: 1,012,567"

dispositive power financial

"Sole power to dispose or to direct the disposition of: 1,012,567"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Parent Holding Company financial

"CUSIP Number(s): G8T088109 | Parent Holding Company"

indirect beneficial owners financial

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

FAQ

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

What stake does Mizuho Financial Group hold in SPACSphere Acquisition Corp. (SSAC)?

Mizuho Financial Group reports beneficial ownership of 1,012,567 common shares of SPACSphere Acquisition Corp., representing 5.5% of the outstanding common share class, according to this Schedule 13G ownership filing.

Does Mizuho have voting control over its SPACSphere Acquisition Corp. (SSAC) shares?

Mizuho reports sole voting power over 1,012,567 shares of SPACSphere Acquisition Corp. It discloses no shared voting power, indicating all reported voting authority is held on a sole basis.

Which Mizuho entity directly holds SPACSphere Acquisition Corp. (SSAC) shares?

The filing states that equity securities 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 those securities.

What type of securities of SPACSphere Acquisition Corp. (SSAC) are reported by Mizuho?

Mizuho reports ownership of Common Shares of SPACSphere Acquisition Corp. The Schedule 13G specifies the title of the class of securities as common shares with the CUSIP G8T088109.

Where is Mizuho Financial Group, Inc., the SPACSphere (SSAC) shareholder, organized?

Mizuho Financial Group, Inc. is organized in Japan. Its principal office address is listed as 1-5-5, Otemachi, Chiyoda-ku, Tokyo, 100-8176, Japan, and its citizenship is reported as Japan.

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

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Available on EDGAR 08/13/2026 - 07:19 AM Accepted by SEC EDGAR 08/13/2026 - 07:19 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

SPACSphere Acquisition Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G8T088109

(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): G8T088109

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 1,012,567.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,012,567.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,012,567.00

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)

5.5 %

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: SPACSphere Acquisition Corp.
(b)	Address of issuer's principal executive offices: 8795 Folsom Blvd, Sacramento, CA 95826
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 Number(s): G8T088109
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: 1,012,567
(b)	Percent of class: 5.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,012,567
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,012,567
	(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:	08/13/2026