| Item 1. | |
| (a) | Name of issuer:
GigCapital8 Corp. |
| (b) | Address of issuer's principal executive offices:
1731 Embarcadero Rd., Suite 200, Palo Alto, California, 94303 |
| Item 2. | |
| (a) | Name of person filing:
This Schedule 13G is being filed by (i) Lynrock Lake LP, (ii) Lynrock Lake Partners LLC, and (iii) Cynthia Paul (collectively, the "Reporting Persons"). |
| (b) | Address or principal business office or, if none, residence:
The principal business address of the Reporting Persons is 2 International Drive, Suite 130, Rye Brook, NY 10573. |
| (c) | Citizenship:
(i) Lynrock Lake LP is a Delaware limited partnership, (ii) Lynrock Lake Partners LLC is a Delaware limited liability company, and (iii) Cynthia Paul is an individual and is a citizen of the United States. |
| (d) | Title of class of securities:
Class A ordinary shares, par value $0.0001 per share |
| (e) | CUSIP No.:
G3864J100 |
| 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);
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| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
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| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
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| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
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| (e) |  An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
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| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
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| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
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| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
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| (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);
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| (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:
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| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
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| Item 4. | Ownership |
| (a) | Amount beneficially owned:
Amount beneficially owned as of December 31, 2025:
Lynrock Lake LP - 1,466,665
Lynrock Lake Partners LLC - 1,466,665
Cynthia Paul - 1,466,665 |
| (b) | Percent of class:
Percent of class as of December 31, 2025:
Lynrock Lake LP - 5.4%
Lynrock Lake Partners LLC - 5.4%
Cynthia Paul - 5.4%
Based on 25,657,625 Class A ordinary shares, par value $0.0001 per share ("Common Stock"), of GigCapital8 Corp. (the "Issuer") outstanding as of November 6, 2025, as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025, plus shares that may be acquired by such Reporting Persons within 60 days.
The shares of the Issuer's Common Stock are held directly by Lynrock Lake Master Fund LP ("Lynrock Lake Master"). Lynrock Lake LP (the "Investment Manager") is the investment manager of Lynrock Lake Master, and pursuant to an investment management agreement, the Investment Manager has been delegated full voting and investment power over securities of the Issuer held by Lynrock Lake Master. Cynthia Paul, the Chief Investment Officer of the Investment Manager and Sole Member of Lynrock Lake Partners LLC, the general partner of the Investment Manager, may be deemed to exercise voting and investment power over securities of the Issuer held by Lynrock Lake Master. %
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| (c) | Number of shares as to which the person has:
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| | (i) Sole power to vote or to direct the vote:
As of December 31, 2025, the Reporting Persons had sole power to vote or to direct the vote of 1,466,665 shares of Common Stock.
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| | (ii) Shared power to vote or to direct the vote:
As of December 31, 2025, the Reporting Persons had shared power to vote or to direct the vote of 0 shares of Common Stock.
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| | (iii) Sole power to dispose or to direct the disposition of:
As of December 31, 2025, the Reporting Persons had sole power to dispose or to direct the disposition of 1,466,665 shares of Common Stock.
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| | (iv) Shared power to dispose or to direct the disposition of:
As of December 31, 2025, the Reporting Persons had shared power to dispose or to direct the disposition of 0 shares of Common Stock.
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| Item 5. | Ownership of 5 Percent or Less of a Class. |
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| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
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If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
As disclosed in Item 4 of this Schedule 13G, as of December 31, 2025, Lynrock Lake Master directly held securities of the Issuer. Certain feeder funds that invest in Lynrock Lake Master may have the right to receive dividends from, or the proceeds from the sale of, the securities directly held by Lynrock Lake Master. |
| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
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Not Applicable
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| Item 8. | Identification and Classification of Members of the Group. |
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Not Applicable
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| Item 9. | Notice of Dissolution of Group. |
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Not Applicable
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