Arthur J. Gallagher & Co. — Director's Dealing 2026

Mar 18, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Arthur J. Gallagher & Co. (AJG)
CIK: 0000354190
Period of Report: 2026-03-15

Reporting Person: Bloom Mark H. (Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-03-15	Common Stock (restricted)	A	3506	—	Acquired	3506	Direct
2026-03-15	Common Stock (restricted)	M	3506	—	Disposed	0	Direct
2026-03-15	Common Stock	M	3506	—	Acquired	4536	Direct
2026-03-15	Common Stock	F	793	$207.93	Disposed	3743	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	193.263	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Non-qualified Stock Option	$228.20	2033-03-01	Common Stock (13331)	13331	Direct
Phantom Stock	$		Common Stock (7255.745)	7255.745	Direct
Non-qualified Stock Option	$337.74	2032-03-01	Common Stock (6887)	6887	Direct
Non-qualified Stock Option	$243.54	2031-03-01	Common Stock (5777)	5777	Direct
Non-qualified Stock Option	$158.56	2029-03-15	Common Stock (4900)	4900	Direct
Non-qualified Stock Option	$177.09	2030-03-15	Common Stock (4673)	4673	Direct
Notional Stock Units	$		Common Stock (962.2459)	962.2459	Direct

Footnotes

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

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

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

F4: 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: Closing price of Gallagher common stock on February 28, 2025.

F6: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F7: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F8: Grant date of 3/15/2022.

F9: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F10: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F11: The notional stock units become payable following the reporting person's separation from service with Gallagher.