X0609 4/A 2026-05-12 2026-05-14 0001527753 Personalis, Inc. PSNL 0001231845 EASTHAM KARIN false C/O PERSONALIS, INC. 6600 DUMBARTON CIRCLE FREMONT CA 94555 true false false false 0 Common Stock 2026-05-12 4 A 0 6250 0 A 19756 D Each share is represented by a restricted stock unit ("RSU"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. 100% of the shares subject to the RSU shall vest on the earlier of the one-year anniversary of the grant date or the day prior to the Company's next annual meeting of stockholders occurring after the grant date, subject to the reporting person's Continuous Service (as defined in the Company's 2019 Equity Incentive Plan (the "2019 Plan")) through the vesting date. In the event of a Change in Control (as defined in the 2019 Plan), the shares underlying the RSU shall vest immediately prior to the effectiveness of such Change in Control. This amendment corrects the number of shares of Common Stock reported as beneficially owned by the Reporting Person on the Form 4 filed on May 14, 2026. /s/ Aaron Tachibana, Attorney-in-Fact 2026-06-11