IBG, Inc.(IBKR) - 2018 Q4 - Annual Report

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the year ended December 31, 2018 Commission File Number: 001-33440 INTERACTIVE BROKERS GROUP, INC. (Exact name of registrant as specified in its charter) Delaware 30-0390693 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) One Pickwick Plaza Greenwich, Connecticut 06830 ( ...