Exhibit 4.2

 



SBI Selecta   Biosciences, Inc. CUSIP SEE REVERSE FOR CERTAIN DEFINITIONS INCORPORATED   UNDER THE LAWS OF THE STATE OF DELAWARE THIS CERTIFIES THAT IS THE RECORD   HOLDER OF FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $0.0001 PAR   VALUE PER SHARE, OF Selecta Biosciences, Inc. SEAL 2007 GENERAL COUNSEL,   CHIEF COMPLIANCE OFFICER AND CORPORATE SECRETARY PRESIDENT AND CHIEF   EXECUTIVE OFFICER COUNTERSIGNED AND REGISTERED: AMERICAN STOCK TRANSFER &   TRUST COMPANY, LLC (Brooklyn, NY) TRANSFER AGENT AND REGISTRAR By AUTHORIZED   SIGNATURE Exhibit 4.2 


    




 










SELECTA   BIOSCIENCES, INC. THE CORPORATION IS AUTHORIZED TO ISSUE TWD CLASSES OF   STOCK, COMMON STOCK AND PREFERRED STOCK. 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/OR RIGHTS, AND THE VARIATIONS   IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH SERIES WHICH ARE   FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COI'v1PANY AND THE AUTHORITY   OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES. SUCH   REQUEST MAY BE MADE TO Tl-IE OFFICE OF Tl-IE SECRETARY OF THE COMPANY OR TO   THE TRANSFER AGENT. 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 TEN   ENT .IT TEN - as tenants in oommon - as tenants by the entireties - as joint   tenants with right of survivorship and not as tenants in common UNIF GIFT MIN   ACT-.....................Custodian.................... {Mir C f) (Cllllt) under   Uniform Gifts to Minors Act ••.••.••••,.•_•.•••,•.••.•••••• Additional   abbreviations may also be used though not in the above list. For value   received, --------------------hereby sell, assign and transfer unto PLEASE   INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE PLEASE PRINT   OR TYPEWRITE NAME AND ADDRESS INCLUDING 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 Corporation with full power of substitution in the   premises. Dared _ NOfiCE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND   WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE,IN EVERY PARTICUlAR,   WITHOUT ALTERATION OR ENLARGBIIENT, OR Af'N CHANGE WHATSOEVER. SIGNATURE(SJ   GUARANTEED: THE SIGNAl\JRE(S) MUST BE GUAAANTEEO BY AN ELIGIBLE GUAAANTOR   INSTmmON (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT   UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDAU..ION   PFI:OGRAM),PURSUANT TO S,E,C., RULE 17M-15,