X0306 4 2017-02-02 0000354190 GALLAGHER ARTHUR J & CO AJG 0001386997 Pietrucha Susan E ARTHUR J. GALLAGHER & CO. TWO PIERCE PLACE ITASCA IL 60143 1 Chief Human Resources Officer Common Stock 2017-02-02 4 M 0 2800 35.71 A 2800 D Common Stock 2017-02-02 4 S 0 2800 53.91 D 0 D Common Stock 2017-02-02 4 M 0 4134 39.17 A 4134 D Common Stock 2017-02-02 4 S 0 4134 53.91 D 0 D Common Stock 2017-02-02 4 M 0 1500 26.09 A 1500 D Common Stock 2017-02-02 4 S 0 1500 53.93 D 0 D Common Stock (restricted) 18291 D Non-qualified Stock Option 35.71 2017-02-02 4 M 0 2800 0 D 2019-03-16 Common Stock 2800 2799 D Non-qualified Stock Option 39.17 2017-02-02 4 M 0 4134 0 D 2020-03-13 Common Stock 4134 8266 D Non-qualified Stock Option 26.09 2017-02-02 4 M 0 1500 0 D 2018-05-13 Common Stock 1500 1500 D The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $53.90 to $53.94. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. The stock option becomes exercisable 10% each year, commencing January 1 after the date of grant. /s/ April Hanes-Dowd, by power of attorney 2017-02-03