Luis Machuca - 07 Oct 2025 Form 3 Insider Report for GigCapital8 Corp. (GIW)

Role: Director
Signature: /s/ Luis Machuca
Issuer symbol: GIW
Transactions as of: 07 Oct 2025
Net transactions value: $0
Form type: 3
Filing time: 08 Oct 2025, 19:53:07 UTC
Previous filing: 31 Jul 2025
Next filing: 06 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MACHUCA LUIS	Director	C/O GIGCAPITAL8 CORP., 1731 EMBARCADERO RD., SUITE 200, PALO ALTO	/s/ Luis Machuca	08 Oct 2025	0001133099

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	GIW	Class A ordinary shares						10,000	07 Oct 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	GIW	Class B ordinary shares							07 Oct 2025	Class A ordinary shares	106,647		Direct	F1, F2, F3
holding	GIW	Right							07 Oct 2025	Class A ordinary shares	2,000		Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.
F3	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.
F4	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.