X0206 3 2019-06-19 0 0001527753 Personalis, Inc. PSNL 0001284839 BALTHROP PATRICK J C/O PERSONALIS, INC. 1330 O'BRIEN DRIVE MENLO PARK CA 94025 1 0 0 0 Common Stock 13541 I See footnote Stock Option (right to buy) 5.28 2025-09-02 Common Stock 23958 D Stock Option (right to buy) 3.80 2028-04-25 Common Stock 12500 D Stock Option (right to buy) 13.20 2029-05-01 Common Stock 15000 D The shares are held of record by Patrick Balthrop & Mariteres Balthrop Trust, of which the Reporting Person and the Reporting Person's spouse serve as co-trustees. The shares subject to the option are fully vested and exercisable. 1/12 of the shares subject to the option vested on August 17, 2018, and 1/12 of the shares vest monthly thereafter. 1/24 of the shares subject to the option will vest on September 17, 2019, and 1/24 of the shares will vest monthly thereafter. /s/ Peter Mandel, Attorney-in-Fact 2019-06-19