SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

GigCapital8 Corp.

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

G3864J126

(CUSIP Number)

10/06/2025

(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.

G3864J126

Names of Reporting Persons

Harraden Circle Investments, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,178,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,178,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

2,178,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.49 %

Type of Reporting Person (See Instructions)

OO, HC, IA

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Investors GP, LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,178,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,178,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

2,178,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.49 %

Type of Reporting Person (See Instructions)

PN, HC

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Investors GP, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,178,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,178,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

2,178,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.49 %

Type of Reporting Person (See Instructions)

OO, HC

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Investors, LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,124,883.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,124,883.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,124,883.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

4.38 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Special Opportunities, LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 545,195.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 545,195.00

Aggregate Amount Beneficially Owned by Each Reporting Person

545,195.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

2.12 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Strategic Investments, LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 382,119.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 382,119.00

Aggregate Amount Beneficially Owned by Each Reporting Person

382,119.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

1.49 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Harraden Circle Concentrated, LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 125,803.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 125,803.00

Aggregate Amount Beneficially Owned by Each Reporting Person

125,803.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.49 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

G3864J126

Names of Reporting Persons

Frederick V. Fortmiller, Jr.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,178,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,178,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

2,178,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.49 %

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

GigCapital8 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:

This Statement is filed on behalf of the following persons (collectively, the "Reporting Persons"): i) Harraden Circle Investments, LLC ("Harraden Adviser"); ii) Harraden Circle Investors GP, LP ("Harraden GP"); iii) Harraden Circle Investors GP, LLC ("Harraden LLC"); iv) Harraden Circle Investors, LP ("Harraden Fund"); v) Harraden Circle Special Opportunities, LP ("Harraden Special Op Fund"); vi) Harraden Circle Strategic Investments, LP ("Harraden Strategic Fund"); vii) Harraden Circle Concentrated, LP ("Harraden Concentrated Fund"); and viii) Frederick V. Fortmiller, Jr. ("Mr. Fortmiller") This Statement relates to Shares (as defined herein) directly beneficially owned by Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, and Harraden Concentrated Fund. Harraden GP is the general partner to Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, and Harraden Concentrated Fund, and Harraden LLC is the general partner of Harraden GP. Harraden Adviser serves as investment manager to Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, Harraden Concentrated Fund, and other high net worth individuals. Mr. Fortmiller is the managing member of each of Harraden LLC and Harraden Adviser. In such capacities, each of Harraden GP, Harraden LLC, Harraden Adviser and Mr. Fortmiller may be deemed to indirectly beneficially own the Shares reported herein directly beneficially owned by Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, and Harraden Concentrated Fund.

(b)

Address or principal business office or, if none, residence:

885 Third Avenue, Suite 2600B, New York, NY 10022

(c)

Citizenship:

Each of Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, Harraden Concentrated Fund, and Harraden GP is a Delaware limited partnership. Each of Harraden LLC and Harraden Adviser is a Delaware limited liability company. Mr. Fortmiller is a citizen of the United States of America.

(d)

Title of class of securities:

Class A Common Stock

(e)

CUSIP No.:

G3864J126

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).

Item 4.

Ownership

(a)

Amount beneficially owned:

2,178,000

(b)

Percent of class:

8.49 %

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

(ii) Shared power to vote or to direct the vote:

2,178,000

(iii) Sole power to dispose or to direct the disposition of:

(iv) Shared power to dispose or to direct the disposition of:

2,178,000

Item 5.

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 disclosure in Item 2 hereof.

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 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.

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.

Harraden Circle Investments, LLC

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member
Date:	10/10/2025

Harraden Circle Investors GP, LP

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member; Harraden Circle Investors GP, LLC, general partner
Date:	10/10/2025

Harraden Circle Investors GP, LLC

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member
Date:	10/10/2025

Harraden Circle Investors, LP

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member; Harraden Circle Investors GP, LLC, general partner; Harraden Circle Investors GP, LP, general partner
Date:	10/10/2025

Harraden Circle Special Opportunities, LP

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member; Harraden Circle Investors GP, LLC, general partner; Harraden Circle Investors GP, LP, general partner
Date:	10/10/2025

Harraden Circle Strategic Investments, LP

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member; Harraden Circle Investors GP, LLC, general partner; Harraden Circle Investors GP, LP, general partner
Date:	10/10/2025

Harraden Circle Concentrated, LP

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member; Harraden Circle Investors GP, LLC, general partner; Harraden Circle Investors GP, LP, general partner
Date:	10/10/2025

Frederick V. Fortmiller, Jr.

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr.
Date:	10/10/2025

SEC Form SCHEDULE 13G filed by GigInternational1 Inc.