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    New insider Greene James S claimed ownership of 10,000 units of Class A ordinary shares (SEC Form 3)

    10/8/25 7:34:12 PM ET
    $GIW
    Get the next $GIW alert in real time by email
    SEC FORM 3 SEC Form 3
    FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
    or Section 30(h) of the Investment Company Act of 1940
    OMB APPROVAL
    OMB Number: 3235-0104
    Estimated average burden
    hours per response: 0.5
    1. Name and Address of Reporting Person*
    GREENE JAMES S

    (Last) (First) (Middle)
    C/O GIGCAPITAL8 CORP.
    1731 EMBARCADERO RD., SUITE 200

    (Street)
    PALO ALTO CA 94303

    (City) (State) (Zip)
    2. Date of Event Requiring Statement (Month/Day/Year)
    10/07/2025
    3. Issuer Name and Ticker or Trading Symbol
    GigCapital8 Corp. [ GIW ]
    4. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    X Director 10% Owner
    Officer (give title below) Other (specify below)
    5. If Amendment, Date of Original Filed (Month/Day/Year)
    6. Individual or Joint/Group Filing (Check Applicable Line)
    X Form filed by One Reporting Person
    Form filed by More than One Reporting Person
    Table I - Non-Derivative Securities Beneficially Owned
    1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
    Class A ordinary shares(1) 10,000 D
    Table II - Derivative Securities Beneficially Owned
    (e.g., puts, calls, warrants, options, convertible securities)
    1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
    Date Exercisable Expiration Date Title Amount or Number of Shares
    Class B ordinary shares (3) (3) Class A ordinary shares 106,647(2) (3) D
    Rights (4) (4) Class A ordinary shares 2,000(4) (4) D
    Explanation of Responses:
    1. Includes 10,000 Class A ordinary shares underlying the private placement units purchased concurrently with the initial public offering. Each private placement unit consisting of one Class A ordinary share and one right to receive one-fifth of one Class A ordinary share upon the completion of the Issuer's initial business combination.
    2. As a result of the underwriters' full exercise of the over-allotment option to purchase 3,300,000 units on October 7, 2025, no such shares are subject to forfeiture.
    3. As described in the Issuer's registration statement on Form S-1, as amended (File No. 333-289479) under the heading "Description of Securities-Ordinary Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination or earlier at the option of the holder on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.
    4. Includes 10,000 rights underlying the private placement units, which were sold in a private placement taking place simultaneously with the Issuer's initial public offering. Each right is exchangeable for one-fifth of one Class A ordinary share upon the completion of the Issuer's initial business combination.
    /s/ James S. Greene 10/08/2025
    ** Signature of Reporting Person Date
    Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
    * If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
    ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
    Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
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