Dr. Avi S. Katz - 23 Jan 2026 Form 3 Insider Report for GigCapital9 Corp. (GIX)

Reporting relationship: Chief Executive Officer, Director, 10%+ Owner
Issuer ticker: GIX
Reported as of: 23 Jan 2026
Net transaction value: $0
SEC form: 3
Accepted by SEC: 26 Jan 2026, 20:44:47 UTC
Prior SEC filing: 23 Jan 2026
Next SEC filing: 24 Mar 2026
Source filing: View source filing
Reporting owner signature: Avi. S. Katz, individually

Key filing fact

Dr. Avi S. Katz filed Form 3 for GigCapital9 Corp. (GIX) on 26 Jan 2026.

Key facts

This page summarizes Dr. Avi S. Katz's Form 3 filing for GigCapital9 Corp. (GIX).
0 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 26 Jan 2026, 20:44.

Change

Previous filing in this sequence was filed on 23 Jan 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (3)

CIK 0001451693 Primary reporting owner

Katz Avi S

Relationship: Chief Executive Officer, Director, 10%+ Owner
Address: C/O GIGCAPITAL9 CORP., 1731 EMBARCADERO ROAD, SUITE 200, PALO ALTO
Signature: Avi. S. Katz, individually
Signature date: 26 Jan 2026

CIK 0002098711

GigAcquisitions9 Corp.

Relationship: 10%+ Owner
Address: C/O GIGCAPITAL9 CORP., 1731 EMBARCADERO ROAD, SUITE 200, PALO ALTO
Signature: Avi. S. Katz, as Chief Executive Officer of GigAcquisitions9 Corp.
Signature date: 26 Jan 2026

CIK 0001430575

Dinu Raluca

Relationship: Director, 10%+ Owner
Address: C/O GIGCAPITAL9 CORP., 1731 EMBARCADERO ROAD, SUITE 200, PALO ALTO
Signature: Dr. Raluca Dinu, individually
Signature date: 26 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

GIX holding

Class A ordinary shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 10,000
Date: 23 Jan 2026
Ownership: GigAcquisitions9 Corp.
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

GIX holding Derivative

Class B ordinary shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 23 Jan 2026
Ownership: GigAcquisitions9 Corp.
Underlying class: Class A ordinary shares
Underlying amount: 6,472,519
Exercise price
Footnotes: F2, F3, F4

GIX holding Derivative

Right

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 23 Jan 2026
Ownership: GigAcquisitions9 Corp.
Underlying class: Class A ordinary shares
Underlying amount: 2,000
Exercise price
Footnotes: F2, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

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

Footnote F2

The Class B ordinary shares and Class A ordinary shares underlying the private placement units are held directly by GigAcquisitions9 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.

Footnote 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. 333-291869) and have no expiration date.

Footnote F4

Includes 6,472,519 Class B ordinary shares of the Issuer acquired by the Sponsor prior to the Issuer's initial public offering convertible for the Issuer's Class A ordinary shares, of which 844,249 Class B ordinary shares remain subject to forfeiture depending on the extent to which the underwriters' over-allotment option is exercised.

Footnote F5

Includes 2,000 rights underlying the private placement units, which are 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.