Transaction Details

Footnotes

The price reported is an average weighted price. The shares were sold in multiple transactions on 12/23/2025 at prices ranging from $258.000 to $258.600. 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 ranges set forth in the footnotes to this Form 4. | In the past, Common Stock and Common Stock (Restricted) were reported as two separate line items. In the future, they will be reported as a combined total as is stated on this Form. | 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. | One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. | One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. | One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date. | Closing price of Gallagher common stock on February 28, 2025. | Each notional stock unit represents a right to receive one share of Gallagher common stock. | The notional stock units become payable following the reporting person's separation from service with Gallagher.