Exhibit 32.2
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
In connection with the Annual Report of GigCapital4, Inc., (the “Registrant”) on Form 10-K for the period ending December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, in the capacity and on the date indicated below, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:
| 
 
  | 
 (1)  | 
 The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and  | 
| 
 
  | 
 (2)  | 
 The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.  | 
| 
 Date: March 31, 2021  | 
 
  | 
 By:  | 
 /s/ Brad Weightman  | 
| 
 
  | 
 
  | 
 
  | 
 Name: Brad Weightman  | 
| 
 
  | 
 
  | 
 
  | 
 Chief Financial Officer (Principal Financial and Accounting Officer)  |