X0202 SCHEDULE 13G 0001080171 XXXXXXXX LIVE Class A ordinary share, par value $0.0001 per share 03/31/2026 0002098712 GigCapital9 Corp. G3865B114 1731 Embarcadero Rd. Suite 200 Palo Alto CA 94303 Rule 13d-1(b) Aristeia Capital, L.L.C. DE 1400000.00 0.00 1400000.00 0.00 1400000.00 N 5.45 IA OO GigCapital9 Corp. 1731 Embarcadero Rd., Suite 200, Palo Alto, CA 94303 Aristeia Capital, L.L.C. One Greenwich Plaza, Suite 300, Greenwich, CT 06830 Delaware N IA 1,400,000 The Reporting Person may be deemed the beneficial owner of 1,400,000 Class A ordinary shares, which is approximately 5.45% of the outstanding shares. This percentage was determined by dividing 1,400,000 by 25,688,954, which is the number of shares outstanding as of March 30, 2026, as reported in the Issuer's 10-K filed with the SEC on March 31, 2026. 5.45% 1,400,000 0 1,400,000 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Aristeia Capital, L.L.C. /s/ Andrew B. David 05/14/2026