X0306 4 2019-03-14 0000354190 GALLAGHER ARTHUR J & CO AJG 0001589933 GALLAGHER THOMAS JOSEPH 2850 GOLF ROAD ROLLING MEADOWS IL 60008-4002 1 VICE PRESIDENT Common Stock (restricted) 2019-03-17 4 M 0 7100 0 D 0 D Common Stock 2019-03-17 4 M 0 7100 0 A 182801 D Common Stock 2019-03-17 4 F 0 2979 80.28 D 179822 D Common Stock 82325 I By grantor retained annuity trust Common Stock 66709 I By Irrevocable Trust Common Stock 31671 I By wife Common Stock 55280 I By wife as trustee Non-qualified Stock Option 79.59 2019-03-14 4 A 0 28200 0 A 2026-03-14 Common Stock 28200 28200 D Phantom Stock 2019-03-18 4 I 0 5648 79.68 A Common Stock 5648 146222.4 D The reporting person disclaims beneficial ownership of these shares, and this report shall not be deemed an admission that the reporting person is the beneficial owner of these shares for purposes of Section 16 or for any other purpose. These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee. One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. 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