Table of Contents As filed with the Securities and Exchange Commission on March 15, 2023 Registration No. 333-270273 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 RingCentral, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 7372 94-3322844 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Iden ...