Form of common stock certificate of the Registrant

Exhibit 4.1

ZQCERT#COYCLSRGSTRYACCT#TRANSTYPERUN#TRANS# COMMON STOCK COMMON STOCK PO PAR VALUE $0.0001 MR ADD 43 2 1 A BOX DESIGNATION SAMPLE Certificate Shares 43004, * * 000000 (IF Number * * * 000000 ANY) ZQ00000000 000000 Providence, PERSONALIS, INC. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample Mr. Alexander David Sample SEE REVERSE FOR CERTAIN DEFINITIONS 02940 **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David THIS CERTIFIES THAT Sample SAMPLE David Sample & David Sample **** Mr. 3004 CUSIP 71535D 10 6 Mr. Alexander David Sample is the owner of THIS CERTIFICATE IS TRANSFERABLE IN ***ZEROHUNDRED THOUSAND CITIES DESIGNATED BY THE TRANSFER AGENT, AVAILABLE ONLINE AT ZERO HUNDRED AND ZERO*** www.computershare.com FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF Personalis, Inc. (hereinafter called the “Company”), transferable on the books of the Company in person or Total DTC by duly authorized attorney, upon surrender of this Certificate properly endorsed. This Certificate and the shares Holder represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Number Certificateof Insurance ID Incorporation, as amended, and the Bylaws, as amended, of the Company (copies of which are on file with the Value Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Transaction Shares CUSIP/IDENTIFIER Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. Numbers ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized officers. DATED DD-MMM-YYYY NALI 6 5 4 3 2 1 O S, COUNTERSIGNED AND REGISTERED: FACSIMILE SIGNATURE TO COME S I 12345678 R O N E ORP RA COMPUTERSHARE TRUST COMPANY, N.A.    T C Num/No P C E . . President TRANSFER AGENT AND REGISTRAR, 6 5 4 3 2 1 Denom 2/21/2011 . XXXXXX DEL RE 1,000,000 FACSIMILE SIGNATURE TO COME AWA 7 6 5 4 3 2 1 . XX Total 123456789012345 123456 00 XXXXXXXXXX X By Secretary AUTHORIZED SIGNATURE

PERSONALIS, INC. THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH SHAREHOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COMPANY, AS AMENDED, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM as tenants in common UNIF GIFT MIN ACT -Custodian (Cust)(Minor) TEN ENT as tenants by the entireties under Uniform Gifts to Minors Act (State) JT TEN as joint tenants with right of survivorship UNIF TRF MIN ACT Custodian (until age) and not as tenants incommon (Cust) under Uniform Transfers to Minors Act (Minor) (State) Additional abbreviations may also be used though not in the above list. PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE For value received, hereby sell, assign and transfer unto (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) Shares of the common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint Attorney to transfer the said stock on the books of the within-named Company with full power of substitution in the premises. Dated: 20 Signature(s) Guaranteed: Medallion Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. Signature: Signature: Notice: The signature to this assignment must correspond with the name as written upon the face of the certificate, in every particular, without alteration or enlargement, or any change whatever. The IRS requires that the named transfer agent (“we”) report the cost basis of certain shares or units acquired after January 1, 2011. If your shares or units are covered by the legislation, and you requested to sell or transfer the shares or units using a specific cost basis calculation method, then we have processed as you requested. If you did not specify a cost basis calculation method, then we have defaulted to the first in, first out (FIFO) method. Please consult your tax advisor if you need additional information about cost basis. If you do not keep in contact with the issuer or do not have any activity in your account for the time period specified by state law, your property may become subject to state unclaimed property laws and transferred to the appropriate state.