Exhibit 32.1
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 Quarterly Report on Form 10-Q of Gritstone bio, Inc. (the “Company”) for the period ended September 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Andrew Allen, M.D., Ph.D., President and Chief Executive Officer (Principal Executive Officer) of the Company, and Vassiliki Economides, Chief Financial Officer (Principal Financial Officer) of the Company, respectively, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:
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Date: |
| November 8, 2023 |
| /s/ Andrew Allen |
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| Andrew Allen, M.D., Ph.D. |
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| President and Chief Executive Officer (Principal Executive Officer) |
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Date: |
| November 8, 2023 |
| /s/ Vassiliki Economides |
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| Vassiliki Economides |
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| Chief Financial Officer (Principal Financial Officer) |