Exhibit 4.1




	
  

  	
  THIS CERTIFIES
  THAT is the owner of CUSIP DATED COUNTERSIGNED AND REGISTERED: COMPUTERSHARE
  TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR, FULLY-PAID AND
  NON-ASSESSABLE SHARES OF COMMON CLASS A STOCK OF Twilio 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, 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. Common Class A PAR VALUE $0.001
  Common Class A SEE REVERSE FOR CERTAIN DEFINITIONS Certificate Number Shares
  . TWILIO INC. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE Chief
  Executive Officer General Counsel and Secretary By AUTHORIZED SIGNATURE March
  2008 DELAWARE TWILIO INC. THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA,
  JERSEY CITY, NJ AND COLLEGE STATION, TX
  ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS# XXXXXX XX X DD-MMM-YYYY *
  * 000000* * * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * *
  * * * * * * * * * * 000000* * * * * * * * * * * * * * * * * * * * * 000000* *
  * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * * * * * **
  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 **** 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 **** 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 **** 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
  **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****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****000000**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**S
  ***ZERO HUNDRED THOUSAND ZERO HUNDRED AND ZERO*** MR. SAMPLE & MRS.
  SAMPLE & MR. SAMPLE & MRS. SAMPLE ZQ00000000 Certificate Numbers
  1234567890/1234567890 1234567890/1234567890 1234567890/1234567890
  1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Total
  Transaction Num/No. 123456 Denom. 123456 Total 1234567 MR A SAMPLE
  DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 PO BOX 43004, Providence, RI
  02940-3004 CUSIP XXXXXX XX X Holder ID XXXXXXXXXX Insurance Value
  1,000,000.00 Number of Shares 123456 DTC 12345678 123456789012345 

  






 










 




	
  

  	
  The IRS
  requires that the named transfer agent (“we”) report the cost basis of
  certain shares or units acquired after January 1, 2011. If your shares or
  units are covered by the legislation, and you requested to sell or transfer
  the shares or units using a specific cost basis calculation method, then we
  have processed as you requested. If you did not specify a cost basis
  calculation method, then we have defaulted to the first in, first out (FIFO)
  method. Please consult your tax advisor if you need additional information
  about cost basis. If you do not keep in contact with the issuer or do not
  have any activity in your account for the time period specified by state law,
  your property may become subject to state unclaimed property laws and
  transferred to the appropriate state. For value received, hereby sell, assign
  and transfer unto Shares Attorney 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. PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
  INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) of the Common Class A Stock
  represented by the within Certificate, and do hereby irrevocably constitute
  and appoint to transfer the said stock on the books of the within-named
  Company with full power of substitution in the premises. . TWILIO 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 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 STOCK 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. 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 (Cust) (Minor) TEN ENT - as tenants by the entireties under
  Uniform Gifts to Minors Act (State) JT TEN - as joint tenants with right of
  survivorship UNIF TRF MIN ACT - Custodian (until age ) and not as tenants in
  common (Cust) under Uniform Transfers to Minors Act (Minor) (State)
  Additional abbreviations may also be used though not in the above list.