X0206 3 2025-10-03 0 0002080019 GigCapital8 Corp. GIW 0001451693 Katz Avi S C/O GIGCAPITAL8 CORP. 1731 EMBARCADERO ROAD, SUITE 200 PALO ALTO CA 94303 1 1 1 0 Chief Executive Officer 0002080021 GigAcquisitions8 Corp. C/O GIGCAPITAL8 CORP. 1731 EMBARCADERO RD., SUITE 200 PALO ALTO CA 94303 0 0 1 0 0001430575 Dinu Raluca C/O GIGCAPITAL8 CORP. 1731 EMBARCADERO RD., SUITE 200 PALO ALTO CA 94303 1 0 0 0 Class A ordinary shares 10000 I By GigAcquisitions8 Corp. Class B ordinary shares Class A ordinary shares 6053167 I By GigAcquisitions8 Corp. Rights Class A ordinary shares 2000 I By GigAcquisitions8 Corp. Includes 10,000 Class A ordinary shares underlying the private placement units purchased concurrently with the initial public offering. 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. 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. 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. 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 2025-10-07 /s/ Dr. Avi S. Katz, as managing member of GigAcquisitions8 Corp. 2025-10-07 /s/ D. Raluca Dinu 2025-10-07