Exhibit 4.1

 



ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   . COMMON SHARES NO PAR VALUE COMMON SHARES THIS CERTIFICATE IS TRANSFERABLE   IN CANTON, MA, JERSEY CITY, NJ AND COLLEGE STATION, TX Shares * * 000000 * *   * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * * *   * * * * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * *   * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * Certificate   Number ZQ00000000 AQUAVENTURE HOLDINGS N.V. INCORPORATED UNDER THE LAWS OF CURAÇAO   ** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David THIS CERTIFIES THAT Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander MR. SAMPLE & MRS. SAMPLE &   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample Sample **** Mr. AlexandeMr DaviRd Sam.ple S**** MAr. AleMxandePr   DavLid SEample *&*** Mr. AMlexanRder DaSvid S.ampSle ***A* Mr.MAlexanPder   DLavidESample **** Mr. Alexander **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David SEE REVERSE FOR CERTAIN DEFINITIONS   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr.   Sample is the owner of   **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***   *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****   000000**Shar*es****0*000Z00**SEhareRs****00O0000**ShHares**U**0000N00**SDhares*R***000E000**DShares**T**000H000**SOhares*U***000S000**AShareNs****00D0000**Shares****0   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000   000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000   00**Shares****0Z0000E0**ShRares***O*000000*H*ShareUs****0N00000D**SharRes****0E0000D0**ShareAs****0N00000D**SharesZ****00E0000R**SharOes****0*000*00**Shares****00000   0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S   FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON SHARES OF AquaVenture Holdings   N.V. (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 to the Company or the Transfer Agent. This   Certificate and the shares represented hereby, are issued and shall be held subject   to all of the provisions of the Articles of Association, as amended, and the   By-Laws, 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. DATED DD-MMM-YYYY COUNTERSIGNED AND REGISTERED: COMPUTERSHARE   TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR, FACSIMILE SIGNATURE TO COME   President JANUARY 29, 2014 CURAÇAO FACSIMILE SIGNATURE TO COME By Secretary   AUTHORIZED SIGNATURE CUSIP Holder ID Insurance Value Number of Shares DTC   Certificate Numbers 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 Total Transaction XXXXXX XX X XXXXXXXXXX 1,000,000.00   123456 12345678 123456789012345 AQUAVENTURE HOLDINGS N.V. PO BOX 43004,   Providence, RI 02940-3004 Num/No. Denom. Total 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2   3 4 5 6 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 CUSIP XXXXXX   XX X 


    




 






 



. AQUAVENTURE   HOLDINGS N.V. 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 SHARES 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 ARTICLES OF   ASSOCIATION 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 SHARE 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.   (Cust) (Minor) (State) (Cust) and not as tenants in common (Minor) (State)   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 shares 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: 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 we report the cost basis of certain   shares acquired after January 1, 2011. If your shares were covered by the   legislation and you have sold or transferred the shares and requested a   specific cost basis calculation method, we have processed as requested. If   you did not specify a cost basis calculation method, we have defaulted to the   first in, first out (FIFO) method. Please visit our website or consult your   tax advisor if you need additional information about cost basis. If you do   not keep in contact with us or do not have any activity in your account for   the time periods specified by state law, your property could become subject   to state unclaimed property laws and transferred to the appropriate state. 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. 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 under Uniform Gifts to Minors   Act......................................................... JT TEN - as   joint tenants with right of survivorship UNIF TRF MIN ACT -   ............................................Custodian (until age   ................................) .............................under Uniform   Transfers to Minors Act ................... Additional abbreviations may also   be used though not in the above list.