Personalis, Inc. — Director's Dealing 2021

May 18, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Personalis, Inc. (PSNL)
CIK: 0001527753
Period of Report: 2021-05-15

Reporting Person: Chen Richard (Chief Scientific Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-15	Common Stock	A	20000	$0.00	Acquired	76372	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-15	Stock Option (right to buy)	$19.74	A	45000	Acquired	2031-05-15	Common Stock (45000)	Direct

Footnotes

F1: 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. The RSUs vest in 8 equal semi-annual installments with the first installment vesting on November 15, 2021.

F2: Includes 538 shares acquired under the Issuer's Employee Stock Purchase Plan ("ESPP") on April 30, 2021.

F3: The shares subject to the option vest in 48 equal monthly installments with the first installment vesting on June 15, 2021.