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Each notional stock unit represents a right to receive one share of Gallagher common stock.

The notional stock units become payable in July 2026 and following the reporting person's separation from service with Gallagher.

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 2026, 2027 and 2028 and following the reporting person's separation from service.

Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2026, 2027 and 2028 and following the reporting person's separation from service.

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 2026 and following the reporting person's separation from service.

Each notional stock unit represents a right to receive one share of Gallagher common stock.

This disposition of notional stock units is a discretionary transaction by the reporting person to move assets he holds in the company's Supplemental Savings and Thrift Plan ("SS&T Plan"), a nonqualified deferred compensation plan, from the investment option representing Gallagher common stock to cash partially to cover his expected tax obligations as a result of a distribution that will occur in July 2026 under such plan.

Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2026, 2028 and 2029 and following the reporting person's separation from service.

The reporting person's disposition of Gallagher common stock reported herein was matchable under Section 16(b) of the Securities and Exchange Act of 1934, to the extent of 12,892.211 shares the reporting person invested in through the SS&T Plan on February 12, 2026. The reporting person had a loss of approximately $32,123 in connection with this short-swing transaction.

This acquisition resulted from the reporting person's election in a prior year (pursuant to the Company's Director Deferral Plan) to defer the reporting person's annual cash retainer, which the Company pays on a quarterly basis, into deferred share units that will be distributed in the form of the Company's common stock.

This acquisition resulted from the reporting person's election in a prior year (pursuant to the Company's Director Deferral Plan) to defer the reporting person's annual cash retainer, which the Company pays on a quarterly basis, into deferred share units that will be distributed in the form of the Company's common stock.

Shares held in trust for the benefit of the reporting person and immediate family members, of which he and his immediate family members, as applicable, is a trustee.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

Restricted stock unit award vesting on the earlier of one year after the date of grant or the reporting person's departure from the Board.

The transactions in this report relate solely to the distribution of vested shares under the Age 62 Plan and the withholding of shares to cover applicable income and employment taxes.

The transactions in this report relate solely to the distribution of vested shares under the Age 62 Plan and the withholding of shares to cover applicable income and employment taxes.

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.

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.

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.

The transactions in this report relate solely to the distribution of vested shares under the Age 62 Plan and the withholding of shares to cover applicable income and employment taxes.

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 in the year they attain age 62, or after a one-year period for participants who have attained age 61.

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.

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.

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.

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.

Shares held in trusts, for the benefit of the reporting person's children, of which his wife is sole trustee.

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.

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.