MarketAxess(MKTX) - 2019 Q1 - Quarterly Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) For the transition period from to (IRS Employer Identification No.) Commission File Number 001-34091 MARKETAXESS HOLDINGS INC. (Exact name of registrant as specified in its charter) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 Delaware 52-2230784 (State or other jurisdiction of incorporation or organization) or ☐ TRANSITION RE ...