SEC FORM 3

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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^*

Katz Avi S

(Last)

(First)

(Middle)

C/O GIGCAPITAL8 CORP.

1731 EMBARCADERO ROAD, SUITE 200

(Street)

PALO ALTO

94303

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/03/2025

3. Issuer Name and Ticker or Trading Symbol
GigCapital8 Corp. [ GIW ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	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	10,000⁽¹⁾⁽²⁾	I	By GigAcquisitions8 Corp.⁽²⁾

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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Class B ordinary shares	⁽³⁾	⁽³⁾	Class A ordinary shares	6,053,167⁽⁴⁾	⁽³⁾	I	By GigAcquisitions8 Corp.⁽²⁾
Rights	⁽⁵⁾	⁽⁵⁾	Class A ordinary shares	2,000	⁽⁵⁾	I	By GigAcquisitions8 Corp.⁽²⁾

1. Name and Address of Reporting Person^*

Katz Avi S

(Last)

(First)

(Middle)

C/O GIGCAPITAL8 CORP.

1731 EMBARCADERO ROAD, SUITE 200

(Street)

PALO ALTO

94303

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

1. Name and Address of Reporting Person^*

GigAcquisitions8 Corp.

(Last)

(First)

(Middle)

C/O GIGCAPITAL8 CORP.

1731 EMBARCADERO RD., SUITE 200

(Street)

PALO ALTO

94303

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director	X	10% Owner
Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Dinu Raluca

(Last)

(First)

(Middle)

C/O GIGCAPITAL8 CORP.

1731 EMBARCADERO RD., SUITE 200

(Street)

PALO ALTO

94303

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

Explanation of Responses:

1. Includes 10,000 Class A ordinary shares underlying the private placement units purchased concurrently with the initial public offering.

2. 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.

3. 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.

4. 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.

5. 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/ Dr. Avi S. Katz, individually	10/07/2025
	/s/ Dr. Avi S. Katz, as managing member of GigAcquisitions8 Corp.	10/07/2025
	/s/ D. Raluca Dinu	10/07/2025
	** 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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