Specimen Common Stock Certificate of NxStage Medical, Inc.

Summary

This document is a specimen certificate representing shares of common stock in NxStage Medical, Inc., a Delaware corporation. It certifies ownership of fully paid and non-assessable shares, which are transferable on the corporation's books upon proper endorsement and surrender of the certificate. The certificate is subject to the company's Certificate of Incorporation and Bylaws. It must be countersigned by the transfer agent to be valid. The certificate also notes that the corporation has more than one class of stock and will provide details about stock rights upon request.

EX-4.1 6 b55874a2exv4w1.txt EX-4.1 SPECIMEN CERTIFICATE Exhibit 4.1 COMMON STOCK COMMON STOCK [NXSTAGE MEDICAL, INC. LOGO] NUMBER SHARES NX SEE REVERSE FOR INCORPORATED UNDER THE LAWS CUSIP 67072V 10 3 CERTAIN DEFINITIONS OF THE STATE OF DELAWARE THIS CERTIFIES THAT is the owner of FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE OF $0.001 PER SHARE, OF NXSTAGE MEDICAL, INC. (hereinafter, the "Corporation") 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 and the shares represented hereby are issued and shall be held subject to all of the provisions of the Certificate of Incorporation and Bylaws of the Corporation and all amendments thereto, copies of which are on file with the Transfer Agent, to all of which the holder of this certificate 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 Corporation and the facsimile signatures of the duly authorized officers of the Corporation. Dated: /s/ Winifred L. Swan (NXSTAGE MEDICAL, INC. SEAL) /s/ Jeffery H. Burbank SECRETARY PRESIDENT COUNTERSIGNED AND REGISTERED: EQUISERVE TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR /S/ (ILLEGIBLE) AUTHORIZED SIGNATURE [CERTIFICATE] NXSTAGE MEDICAL, INC. THE CORPORATION HAS MORE THAN ONE CLASS OF STOCK AUTHORIZED TO BE ISSUED. THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER UPON WRITTEN REQUEST A COPY OF THE FULL TEXT OF THE PREFERENCES, VOTING POWERS, QUALIFICATIONS AND SPECIAL AND RELATIVE RIGHTS OF THE SHARES OF EACH CLASS OF STOCK (AND ANY SERIES THEREOF) AUTHORIZED TO BE ISSUED BY THE CORPORATION AS SET FORTH IN THE CERTIFICATE OF INCORPORATION OF THE CORPORATION AND AMENDMENTS THERETO FILED WITH THE SECRETARY OF THE STATE OF DELAWARE. 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 ________ TEN ENT - as tenants by the entireties (Cust) (Minor) JT TEN - as joint tenants with right under Uniform Gifts to Minors of survivorship and not as Act ___________________________ tenants in common (State) Additional abbreviations may also be used though not in the above list. FOR VALUE RECEIVED, _________________ hereby sells, assigns and transfers 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 capital stock represented by this Certificate, and does hereby irrevocably constitute and appoint _______________________________________________________________________________________________ Attorney to transfer the said stock on the books of the Corporation with full power of substitution in the premises. Dated _____________________ X --------------------------------------------------- X --------------------------------------------------- NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. SIGNATURE(S) GUARANTEED: By - --------------------------------------------------- THE SIGNATURE(S) MUST 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.