X0206 3 2025-10-07 0 0002080019 GigCapital8 Corp. GIW 0001201110 TIMM BRYAN C/O GIGCAPITAL8 CORP. 1731 EMBARCADERO RD., SUITE 200 PALO ALTO CA 94303 1 0 0 0 Class A ordinary shares 10000 D Class B ordinary shares Class A ordinary shares 106647 D Rights Class A ordinary shares 2000 D 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. 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. 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. 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/ Bryan Timm 2025-10-15