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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

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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).
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