Table of Contents Title of each classTrading symbol(s)Name of each exchange on which registered Common Stock, par value $1.00 per share AJG New York Stock Exchange UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly report pursuant to section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2019 or ☐ Transition report pursuant to section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition pe ...