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☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT 1934 For the quarterly period ended March 31 , 2021 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 001-37806 twilio TWILIO INC . ( Exact name of registrant as specified in its charter ) 26-2574840 ( I.R.S. Employer Identification Number ) Delaware ( State or other jurisdiction of incorporation or organization ) 101 Spear Street , First Floor San Francisco , California 94105 ( Address of principal executive offices ) ( Zip Code ) ( 415 ) 390-2337 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the act : Title of each class Class A Common Stock , par value $ 0.001 per share Trading Symbol ( s ) TWLO Name of each exchange on which registered The New York Stock Exchange As of April 30 , 2021 , 162,370,009 shares of the registrant's Class A common stock and 10,325,768 shares of registrant's Class B common stock were outstanding . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes x No o Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( $ 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes x No o Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer ” , “ smaller reporting company ” and “ emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer 冈 ☐ Accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . 0 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No ☑ ☐ ☐ ☐