X0306 4 2019-03-14 0000354190 GALLAGHER ARTHUR J & CO AJG 0001222374 HOWELL DOUGLAS K 2850 GOLF ROAD ROLLING MEADOWS IL 60008-4002 1 VP & Chief Financial Officer Common Stock (restricted) 2019-03-14 4 A 0 2825 0 A 29775 D Common Stock (restricted) 2019-03-17 4 M 0 10700 0 D 19075 D Non-qualified Stock Option 79.59 2019-03-14 4 A 0 14100 0 A 2026-03-14 Common Stock 14100 14100 D Notional Stock Units 0 2019-03-17 4 M 0 10700 0 A Common Stock 10700 161846 D Phantom Stock 2019-03-18 4 I 0 6275 79.68 A Common Stock 6275 162756.5 D Restricted stock unit award vesting five years after the date of grant. One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. Each notional stock unit represents a right to receive one share of Gallagher common stock. Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2019, 2020, 2021, 2022, 2023, and following the reporting person's separation from service. Each share of phantom stock represents a right to receive one share of Gallagher common stock. These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61. /s/ Seth Diehl, by power of attorney 2019-03-18