Mizuho (GIG) holds 1.48M shares of GigCapital7, filing shows

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. reported beneficial ownership of 1,477,330 common shares of GigCapital7 Corp., representing 7.4% of the class as of 03/31/2026.

The filing, submitted on a Schedule 13G, states the shares are directly held by Mizuho Securities USA LLC and notes that Mizuho Bank, Ltd. and related entities may be deemed indirect beneficial owners of those securities.

Insights

Institutional Ownership Analyst

Mizuho holds a meaningful passive stake in GigCapital7 at 7.4%.

Mizuho Financial Group reports 1,477,330 shares beneficially owned as of 03/31/2026, filed on a Schedule 13G indicating passive investment intent. The filing identifies the direct holder as Mizuho Securities USA LLC.

The filing includes a qualifier that Mizuho Bank, Ltd. and affiliates may be deemed indirect beneficial owners; transactional or voting intentions beyond passive ownership are not stated in the excerpt.

Corporate Governance Specialist

Disclosure clarifies voting and dispositive power and parent/subsidiary attribution.

The Schedule 13G lists sole voting power and sole dispositive power of 1,477,330 shares, with shared powers at zero. The filing follows parent holding-company exhibit rules and provides a signature attesting to comparability of foreign regulation.

Any change in voting behavior or plans to convert to an active Schedule 13D would be material and require further filings; timing and intentions are not included in the provided excerpt.

Key Figures

Reporting form: Schedule 13G Shares beneficially owned: 1,477,330 shares Percent of class: 7.4% +2 more

5 metrics

Reporting form Schedule 13G Passive ownership disclosure

Shares beneficially owned 1,477,330 shares as of <date>03/31/2026</date>

Percent of class 7.4% Common Shares of GigCapital7 Corp.

CUSIP G38648104 GigCapital7 common shares

Sole voting power 1,477,330 Shares for which sole vote power is claimed

Key Terms

Schedule 13G, beneficially owned, sole dispositive power

3 terms

Schedule 13G regulatory

"The filing is submitted on a Schedule 13G indicating passive ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Amount beneficially owned: 1,477,330 (b) Percent of class: 7.4 %"

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 dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 1,477,330"

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.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

GigCapital7 Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G38648104

(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): G38648104

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 1,477,330.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,477,330.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,477,330.00

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)

7.4 %

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: GigCapital7 Corp.
(b)	Address of issuer's principal executive offices: 1731 Embarcadero Rd., Suite 200, Palo Alto, CA, 94303
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): G38648104
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: 1,477,330
(b)	Percent of class: 7.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,477,330
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,477,330
	(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 hold in GigCapital7 (GIG)?

Mizuho beneficially owns 1,477,330 shares, representing 7.4% of GigCapital7's common stock as of 03/31/2026. The filing lists sole voting and dispositive power over those shares through Mizuho Securities USA LLC.

Does the Schedule 13G mean Mizuho is an active controller of GIG?

No; a Schedule 13G filing typically indicates passive ownership rather than an intent to influence control. The excerpt shows sole voting power listed but does not state any active control plans or intentions to change disclosure status.

Who directly holds the shares reported by Mizuho?

The shares are directly held by Mizuho Securities USA LLC, according to the filing. The parent notes that Mizuho Bank, Ltd. and affiliates may be deemed indirect beneficial owners because of subsidiary ownership structures.

What voting and disposition powers are disclosed in the filing?

The filing reports sole power to vote and sole power to dispose of 1,477,330 shares, with 0 shared voting or dispositive power reported in the excerpt.

Does this filing change regulatory status or require further disclosure?

The Schedule 13G is a passive ownership disclosure; any material change in intent or plans to influence control would typically require conversion to a Schedule 13D. The excerpt does not state any such plans or timelines.