Exhibit 4.1

ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS# COMMON STOCK PAR VALUE $0.001 Generate: Biomedicines Certificate Number ZQ00000000 COMMON STOCK Shares * 000000 **** 000000 ******* ******* 000000 ********* ** 000000 ********* ****** 000000 * Generate Biomedicines, Inc. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE THIS CERTIFIES THAT ** Mr. Alexander David Sample SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 370920 10 0 is the owner of **000000**Shares**** ***ZERO HUNDRED THOUSAND ZERO HUNDRE THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT, AVAILABLE ONLINE AT www.computershare.com FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF Generate Biomedicines, Inc. (hereinafter called the “Company”), transferable on the books of the Company in person or by duly authorized attorney, upon surrender of this Certificate properly endorsed. This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as amended, and the Bylaws, as amended, of the Company (copies of which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized officers. FACSIMILE SIGNATURE TO COME President FACSIMILE SIGNATURE TO COME Secretary DATED DD-MMM-YYYY COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR, By AUTHORIZED SIGNATURE 1234567 GENERATE BIOMEDICINES, INC CORPORATE SEAL August 20, 2018 DELAWARE Generate: Biomedicines PO Box 43004, Providence RI 02940-3004 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 CUSIP/IDENTIFIER XXXXXX XX X Holder ID XXXXXXXXXX Insurance Value 1,000,000.00 Number of Shares 123456 DTC 12345678 123456789012345 Certificate Numbers 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Total Transaction Num/No. Denom. Total 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7

Generate Biomedicines, Inc. S-1/A