AJG

SEC source: 0000354190-25-000029 · form4.xml · nonDerivative · entry 2

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,520

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000354190-25-000029 · form4.xml · nonDerivative · entry 1

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,920

SEC source: 0000354190-25-000027 · form4.xml · nonDerivative · entry 1

JOHNSON DAVID S · CIK 0001192476 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,624.624

F1 · kind: 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.

SEC source: 0000354190-25-000025 · form4.xml · nonDerivative · entry 1

Miskel Christopher C. · CIK 0001804681 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,947.996

F1 · kind: 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.

SEC source: 0000354190-25-000023 · form4.xml · nonDerivative · entry 1

CARY RICHARD C · CIK 0001185998 · Controller, CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,667.789

F1 · balance_after: 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.

SEC source: 0000354190-25-000021 · form4.xml · nonDerivative · entry 4

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Indirect · By Irrevocable Trust

Disclosed balance after: 96,709

SEC source: 0000354190-25-000021 · form4.xml · nonDerivative · entry 3

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Indirect · By wife

Disclosed balance after: 32,428

F3 · shares: The reporting person's spouse transferred these shares of common stock to an irrevocable trust for no consideration. The reporting person is trustee of the trust, and the reporting person and his children are the sole beneficiaries of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

SEC source: 0000354190-25-000021 · form4.xml · nonDerivative · entry 2

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Indirect · By wife as trustee

Disclosed balance after: 119,175

F1 · ownership.nature: 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.

F2 · ownership.nature: These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee.

SEC source: 0000354190-25-000021 · form4.xml · nonDerivative · entry 1

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 308,046.08

SEC source: 0000354190-25-000015 · form4.xml · derivative · entry 7

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,233.3409

Underlying: Common Stock · 1,376.035 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F4 · derivative.exercise_date: Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2025 and 2026 and following the reporting person's separation from service.

F4 · derivative.expiration_date: Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2025 and 2026 and following the reporting person's separation from service.

SEC source: 0000354190-25-000015 · form4.xml · nonDerivative · entry 1

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 308,921.08

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000354190-25-000013 · form4.xml · derivative · entry 4

HOWELL DOUGLAS K · CIK 0001222374 · VP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 177,994.9726

Underlying: Common Stock · 35,739.4628 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F3 · derivative.exercise_date: Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2024, 2025, 2026, 2028 and 2029 and following the reporting person's separation from service.

F3 · derivative.expiration_date: Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2024, 2025, 2026, 2028 and 2029 and following the reporting person's separation from service.

SEC source: 0000354190-25-000013 · form4.xml · nonDerivative · entry 1

HOWELL DOUGLAS K · CIK 0001222374 · VP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 117,776.7558

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000354190-25-000005 · form4.xml · nonDerivative · entry 1

Harries Richard de Winton Wilkin · CIK 0002030079 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,303

SEC source: 0001127602-25-017840 · form4.xml · nonDerivative · entry 1

Pesch Michael Robert · CIK 0002022545 · President

10b5-1 filing: No plan indicated

Ownership: Indirect · By Child

Disclosed balance after: 59

SEC source: 0001127602-25-017303 · form4.xml · nonDerivative · entry 4

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,430.248

SEC source: 0001127602-25-017298 · form4.xml · nonDerivative · entry 4

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Irrevocable Trust

Disclosed balance after: 66,703

SEC source: 0001127602-25-017303 · form4.xml · nonDerivative · entry 3

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse's Trust

Disclosed balance after: 53,112

F2 · ownership.nature: Shares held in a revocable trust and an irrevocable trust of which the reporting person's spouse is sole Trustee and as to which he disclaims beneficial ownership

SEC source: 0001127602-25-017303 · form4.xml · nonDerivative · entry 2

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Irrevocable Trust

Disclosed balance after: 54,959

SEC source: 0001127602-25-017303 · form4.xml · nonDerivative · entry 1

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 20,432

F1 · ownership.nature: Shares held in trust for the benefit of the reporting person's children, of which he is a trustee.

SEC source: 0001127602-25-017298 · form4.xml · nonDerivative · entry 3

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 219,355

F2 · ownership.nature: Held in trust for benefit of children.

SEC source: 0001127602-25-017298 · form4.xml · nonDerivative · entry 2

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 271,525

F1 · ownership.nature: Shares held in revocable trust of which my spouse is sole Trustee and as to which I disclaim beneficial ownership.

SEC source: 0001127602-25-017298 · form4.xml · nonDerivative · entry 1

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,854.9245

SEC source: 0001127602-25-016777 · form4.xml · nonDerivative · entry 1

JOHNSON DAVID S · CIK 0001192476 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,463.312

F1 · kind: 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.

SEC source: 0001127602-25-016775 · form4.xml · nonDerivative · entry 1

Miskel Christopher C. · CIK 0001804681 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,798.794

F1 · kind: 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.

F2 · balance_after: In the past, the notional stock units delivered as a result of the director's deferral election were reported in Table II. In the future, the balance of 2,091.933 notional stock units will be shown together with the Common Stock balance as shown in this Form.

SEC source: 0001127602-25-015930 · form4.xml · nonDerivative · entry 1

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 272,425

F1 · ownership.nature: Shares held in revocable trust of which my spouse is sole Trustee and as to which I disclaim beneficial ownership.

SEC source: 0001127602-25-015344 · form4.xml · derivative · entry 4

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,400

Underlying: Common Stock · 10,500 shares

Expires 2026-03-14

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

SEC source: 0001127602-25-015344 · form4.xml · nonDerivative · entry 2

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,175

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/21/2025 at prices ranging from $337.10 to $337.43. 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.

SEC source: 0001127602-25-015344 · form4.xml · nonDerivative · entry 1

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,675

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-25-015071 · form4.xml · derivative · entry 4

Pietrucha Susan E · CIK 0001386997 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,500 shares

Expires 2026-03-14

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

SEC source: 0001127602-25-015071 · form4.xml · nonDerivative · entry 2

Pietrucha Susan E · CIK 0001386997 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,940.8404

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/19/2025 at prices ranging from $344.00 to $344.49. 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.

SEC source: 0001127602-25-015071 · form4.xml · nonDerivative · entry 1

Pietrucha Susan E · CIK 0001386997 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,440.8404

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-25-015057 · form4.xml · nonDerivative · entry 1

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 307,545.045

SEC source: 0001127602-25-015051 · form4.xml · nonDerivative · entry 1

JOHNSON DAVID S · CIK 0001192476 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,323

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/16/2025 at prices ranging from $342.000 to $342.065. 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.

SEC source: 0001127602-25-014775 · form4.xml · nonDerivative · entry 2

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse as Trustee

Disclosed balance after: 10,560

F2 · ownership.nature: Shares held in trusts, for the benefit of the reporting person's children, of which his wife is sole trustee.

SEC source: 0001127602-25-014775 · form4.xml · nonDerivative · entry 1

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,097.248

F1 · balance_after: 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.

SEC source: 0001127602-25-014526 · form4.xml · nonDerivative · entry 1

BARRAT SHERRY S · CIK 0001182700 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,072.561

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014558 · form4.xml · nonDerivative · entry 1

ROSENTHAL NORMAN L · CIK 0001137113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,876.26

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014555 · form4.xml · nonDerivative · entry 1

Caplan Deborah H · CIK 0001574454 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,540

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014553 · form4.xml · nonDerivative · entry 1

NICOLETTI RALPH J · CIK 0001192519 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,164.245

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014549 · form4.xml · nonDerivative · entry 1

Miskel Christopher C. · CIK 0001804681 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,706.861

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014546 · form4.xml · nonDerivative · entry 1

JOHNSON DAVID S · CIK 0001192476 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,323

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014540 · form4.xml · nonDerivative · entry 1

Coldman David John · CIK 0001626207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,234

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014542 · form4.xml · nonDerivative · entry 1

Harries Richard de Winton Wilkin · CIK 0002030079 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,359

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-014538 · form4.xml · nonDerivative · entry 1

Clarke Teresa Hillary · CIK 0001875332 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,442.396

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001127602-25-013846 · form4.xml · nonDerivative · entry 1

CARY RICHARD C · CIK 0001185998 · Controller, CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,028.789

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/7/2025 at prices ranging from $339.50 to $339.72. 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.

SEC source: 0001127602-25-011278 · form4.xml · derivative · entry 9

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 135,145.122

Underlying: Common Stock · 7,051.828 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011278 · form4.xml · nonDerivative · entry 2

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,723.3088

SEC source: 0001127602-25-011278 · form4.xml · nonDerivative · entry 1

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,848.1368

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-25-011277 · form4.xml · derivative · entry 8

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,470.705

Underlying: Common Stock · 105.007 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.