Dr. Avi S. Katz - 03 Oct 2025 Form 3 Insider Report for GigCapital8 Corp. (GIW)

Role: Chief Executive Officer, Director, 10%+ Owner
Signature: /s/ Dr. Avi S. Katz, individually
Issuer symbol: GIW
Transactions as of: 03 Oct 2025
Net transactions value: $0
Form type: 3
Filing time: 07 Oct 2025, 21:02:57 UTC
Previous filing: 02 Sep 2025
Next filing: 17 Feb 2026
SEC: View on sec.gov

Reporting Owners (3)

Name	Relationship	Address	Signature	Signature date	CIK
Katz Avi S	Chief Executive Officer, Director, 10%+ Owner	C/O GIGCAPITAL8 CORP., 1731 EMBARCADERO ROAD, SUITE 200, PALO ALTO	/s/ Dr. Avi S. Katz, individually	07 Oct 2025	0001451693
GigAcquisitions8 Corp.	10%+ Owner	C/O GIGCAPITAL8 CORP., 1731 EMBARCADERO RD., SUITE 200, PALO ALTO	/s/ Dr. Avi S. Katz, as managing member of GigAcquisitions8 Corp.	07 Oct 2025	0002080021
Dinu Raluca	Director	C/O GIGCAPITAL8 CORP., 1731 EMBARCADERO RD., SUITE 200, PALO ALTO	/s/ D. Raluca Dinu	07 Oct 2025	0001430575

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	GIW	Class A ordinary shares						10,000	03 Oct 2025	By GigAcquisitions8 Corp.	F1, F2

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							03 Oct 2025	Class A ordinary shares	6,053,167		By GigAcquisitions8 Corp.	F2, F3, F4
holding	GIW	Rights							03 Oct 2025	Class A ordinary shares	2,000		By GigAcquisitions8 Corp.	F2, F5

* 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.
F2	The Class B ordinary shares and Class A ordinary shares underlying the private placement units are held directly by GigAcquisitions8 Corp. (the "Sponsor"). The shares held by the Sponsor are beneficially owned equally (50% each) by Dr. Katz, the Issuer's Chief Executive Officer and Chairman of the Board of Directors, and Dr. Raluca Dinu, the Issuer's Director. Dr. Katz and Dr. Dinu are the members of the Sponsor, who both have the voting and dispositive power over the shares held by the Sponsor.
F3	The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-289479) and have no expiration date.
F4	Includes 6,053,167 Class B ordinary shares of the Issuer acquired by GigAcquisitions8 Corp. (the "Sponsor") prior to the Issuer's initial public offering convertible for the Issuer's Class A ordinary shares. As a result of the underwriter's full exercise of its over-allotment option to purchase 3,300,000 units on October 7, 2025, no such shares are subject to forfeiture.
F5	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.