Personalis (PSNL) 10-K 2022 FY Annual report

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE AND FINANCIAL OFFICER 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 Personalis, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 23, 2023	By:	/s/ Aaron Tachibana
		Aaron Tachibana
		Interim Chief Executive Officer and Chief Financial Officer (Principal Executive Officer and Principal Financial Officer)