Exhibit 4.2

 



ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   . CLASS A COMMON STOCK PAR VALUE $0.000001 CLASS A COMMON STOCK THIS   CERTIFICATE IS TRANSFERABLE IN CANTON, MA, JERSEY CITY, NJ AND COLLEGE   STATION, TX Shares * * 000000 * * * * * * * * * * * * * * * * * * * * *   000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * *   * * * * * * * * * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 *   * * * * * * * * * * * * * Certificate Number ZQ00000000 The Trade Desk, Inc.   INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE ** 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 David   Sample **** Mr. Alexander David Sample *&*** Mr. Alexander David Sample   ***A* Mr.Alexander David Sample **** 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**Shares****0*00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**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****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000R**Shares****000000**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**   FULLY-PAID AND NON-ASSESSABLE SHARES OF CLASS A COMMON STOCK OF The Trade   Desk, 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 and the By-Laws of the Company, each as amended   and/or restated from time to time (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 2016 DELAWARE 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 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 88339J 105


    




 






 



The Trade Desk,   Inc. 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 RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND   LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF   INCORPORATION OF THE COMPANY, AS AMENDED AND/OR RESTATED FROM TIME TO TIME,   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 OWNER OF A LOST OR DESTROYED STOCK   CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, MAY BE REQUIRED 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 Class A 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 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.