Form of Stock Certificate evidencing the shares of common stock

Exhibit 4.2

LTI COMMON STOCK LYRA THERAPEUTICS, INC. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE CUSIP 55234L 10 5 SEE REVERSE FOR CERTAIN DEFINITIONS THIS CERTIFIES THAT SPECIMEN is the owner of FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF THE PAR VALUE OF $0.001 PER SHARE OF LYRA THERAPEUTICS, INC. transferable on the books of the Corporation by the holder hereof in person or by duly authorized Attorney, upon surrender of this Certificate properly endorsed. This Certificate is not valid until countersigned and registered by the Transfer Agent and Registrar. WITNESS the facsimile signatures of the Corporation’s duly authorized officers. Dated: AUTHORIZED SIGNATURE COUNTERSIGNED AND REGISTERED: AMERICAN STOCK TRANSFER TRUST& COMPANY, LLC (BROOKLYN, NY) TRANSFER AGENT AND REGISTRAR BY: PRESIDENT SECRETARY

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 TEN ENT — as tenants by the entireties JT TEN — as joint tenants with right of survivorship and not as tenants in commom UNIF GIFT MIN ACT –– (Cust) Custodian (Minor) under Uniform Gifts to Minors Act (State)
Additional abbreviations may also be used though not in the above list. FOR VALUE RECEIVED, hereby sell, assign and transfer unto PLEASE IDENTIFYING INSERT SOCIAL NUMBER SECURITY OF ASSIGNEE OR OTHER (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. Dated 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. Signature(s) Guaranteed: 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.