AJG

SEC source: 0000354190-26-000083 · form4.xml · nonDerivative · entry 3

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,062.6637

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: 0000354190-26-000083 · form4.xml · nonDerivative · entry 2

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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: 0000354190-26-000083 · form4.xml · nonDerivative · entry 1

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,620

F1 · shares: Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

SEC source: 0000354190-26-000079 · form4.xml · nonDerivative · entry 1

CARY RICHARD C · CIK 0001185998 · Controller, CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,486.789

F1 · kind: Shares withheld to cover applicable tax obligations relating to the vesting of restricted stock units.

SEC source: 0000354190-26-000077 · form4.xml · nonDerivative · entry 4

Bloom Mark H. · CIK 0001795399 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,743

SEC source: 0000354190-26-000077 · form4.xml · nonDerivative · entry 3

Bloom Mark H. · CIK 0001795399 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,536

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: 0000354190-26-000077 · form4.xml · nonDerivative · entry 2

Bloom Mark H. · CIK 0001795399 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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: 0000354190-26-000077 · form4.xml · nonDerivative · entry 1

Bloom Mark H. · CIK 0001795399 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,506

F1 · shares: Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,414

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,504

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: 0000354190-26-000075 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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: 0000354190-26-000075 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,090

F1 · shares: Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

SEC source: 0000354190-26-000097 · form4.xml · nonDerivative · entry 4

Ziebell William F · CIK 0001695709 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,684.8241

SEC source: 0000354190-26-000097 · form4.xml · nonDerivative · entry 3

Ziebell William F · CIK 0001695709 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,005.8241

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: 0000354190-26-000097 · form4.xml · nonDerivative · entry 2

Ziebell William F · CIK 0001695709 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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: 0000354190-26-000097 · form4.xml · nonDerivative · entry 1

Ziebell William F · CIK 0001695709 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,930

F1 · date: Filed one day late due to a technical filing issue.

F2 · shares: Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

SEC source: 0000354190-26-000087 · form4.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 14,100 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.

F3 · shares: Expiring stock options auto-exercised under the terms of the Long-Term Incentive Plan.

F4 · 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: 0000354190-26-000087 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,492.7558

SEC source: 0000354190-26-000087 · 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: 110,130.7558

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: 0000354190-26-000066 · form4.xml · derivative · entry 4

Jain Vishal · CIK 0001812516 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 8,450 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: Grant date of 3/14/2019.

F3 · 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: 0000354190-26-000066 · form4.xml · nonDerivative · entry 2

Jain Vishal · CIK 0001812516 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,985.69

F1 · kind: Shares withheld to cover applicable tax obligations and the exercise price relating to the exercise of 7,410 expiring stock options.

SEC source: 0000354190-26-000066 · form4.xml · nonDerivative · entry 1

Jain Vishal · CIK 0001812516 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,311.69

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: 0000354190-26-000060 · form4.xml · derivative · entry 4

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,800 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: 0000354190-26-000060 · form4.xml · nonDerivative · entry 2

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,920

F1 · kind: Exercise and sale of expiring stock options.

SEC source: 0000354190-26-000060 · form4.xml · nonDerivative · entry 1

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,720

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: 0000354190-26-000064 · form4.xml · derivative · entry 4

Mead Christopher E · CIK 0001737644 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,000 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.

F3 · 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: 0000354190-26-000064 · form4.xml · nonDerivative · entry 2

Mead Christopher E · CIK 0001737644 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,305.7322

F1 · kind: Exercise and sale of expiring stock options.

F2 · price: The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $$227.050 - $227.580. 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 range set forth in this footnote.

SEC source: 0000354190-26-000064 · form4.xml · nonDerivative · entry 1

Mead Christopher E · CIK 0001737644 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,305.7322

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: 0000354190-26-000062 · form4.xml · derivative · entry 6

Pesch Michael Robert · CIK 0002022545 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,750 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.

F3 · derivative.exercise_date: Grant date of 3/14/2019.

F4 · derivative.exercise_date: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

SEC source: 0000354190-26-000062 · form4.xml · nonDerivative · entry 2

Pesch Michael Robert · CIK 0002022545 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,865.6557

F1 · kind: Shares withheld to cover applicable tax obligations and the exercise price relating to the exercise of expiring stock options.

SEC source: 0000354190-26-000062 · form4.xml · nonDerivative · entry 1

Pesch Michael Robert · CIK 0002022545 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,598.6557

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: 0000354190-26-000058 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,399.1

Underlying: Common Stock · 1,982.292 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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 in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F2 · 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 in the year they attain age 62, or after a one-year period for participants who have attained age 61.

SEC source: 0000354190-26-000056 · form4.xml · derivative · entry 1

Bloom Mark H. · CIK 0001795399 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,255.745

Underlying: Common Stock · 1,541.782 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000054 · form4.xml · derivative · entry 1

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 143,990.15

Underlying: Common Stock · 7,929.166 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000052 · form4.xml · derivative · entry 1

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,594.638

Underlying: Common Stock · 1,541.782 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000050 · form4.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,928.978

Underlying: Common Stock · 2,643.055 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000048 · form4.xml · derivative · entry 1

Hudson Scott R · CIK 0001482241 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,764.121

Underlying: Common Stock · 2,202.546 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000046 · form4.xml · derivative · entry 1

Jain Vishal · CIK 0001812516 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,506.268

Underlying: Common Stock · 1,982.292 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000044 · form4.xml · derivative · entry 1

Mead Christopher E · CIK 0001737644 · VICE PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,803.927

Underlying: Common Stock · 1,541.782 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000042 · form4.xml · derivative · entry 1

Pesch Michael Robert · CIK 0002022545 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,197.003

Underlying: Common Stock · 1,321.528 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000040 · form4.xml · derivative · entry 1

Pietrucha Susan E · CIK 0001386997 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,637.795

Underlying: Common Stock · 1,982.292 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000038 · form4.xml · derivative · entry 1

GALLAGHER THOMAS JOSEPH · CIK 0001589933 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,232.185

Underlying: Common Stock · 2,643.055 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · 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.

F2 · 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: 0000354190-26-000013 · form4.xml · derivative · entry 9

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,000 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.

F5 · derivative.exercise_date: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F6 · derivative.exercise_date: Grant date of 3/14/2019.

SEC source: 0000354190-26-000013 · form4.xml · nonDerivative · entry 1

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,442.6637

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: 0000354190-26-000034 · form4.xml · derivative · entry 10

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,072.954

Underlying: Common Stock · 91,769.428 shares

Expires not disclosed

F6 · derivative.exercise_price: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F7 · shares: The reporting person moved $20,669,228.36 in assets that he holds in the company's Supplemental Savings and Thrift Plan, a nonqualified deferred compensation plan, into the investment option representing Gallagher common stock, which is a discretionary transaction by the reporting person.

F8 · derivative.exercise_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

F8 · derivative.expiration_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

SEC source: 0000354190-26-000034 · form4.xml · nonDerivative · entry 5

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 219,955

F4 · ownership.nature: Held in trust for benefit of children.

SEC source: 0000354190-26-000034 · form4.xml · nonDerivative · entry 4

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 270,175

F3 · ownership.nature: Shares held in revocable trust of which my spouse is sole Trustee and as to which I disclaim beneficial ownership.

SEC source: 0000354190-26-000034 · form4.xml · nonDerivative · entry 3

GALLAGHER J PATRICK JR · CIK 0001186006 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,104.9335

SEC source: 0000354190-26-000036 · 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: 53,262

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: 0000354190-26-000036 · form4.xml · nonDerivative · entry 2

Gallagher Patrick Murphy · CIK 0001929606 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 21,032

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