Form 4 for AJG Arthur J. Gallagher & Co.

Accepted 2026-03-24 00:00:00 ET · period of report 2026-03-23 · accession 0000354190-26-000108 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
MI	2026-03-24	2026-03-23	AJG	GALLAGHER THOMAS JOSEPH	Pres	G - Gift	$0.00	+88	32.2K	+0.3%	$0
M	2026-03-24	2026-03-23	AJG	GALLAGHER THOMAS JOSEPH	Pres	G - Gift	$0.00	-792	323.4K	-0.2%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-03-23	G	D	176	$0.00	31,988	I	—	—
2	Common	Common Stock	2026-03-23	G	D	264	$0.00	323,919.08	D By wife as trustee	—	—	(F1) 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) These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee.
3	Common	Common Stock	2026-03-23	G	A	264	$0.00	119,439	I By wife	—	—
4	Common	Common Stock	2026-03-23	G	D	528	$0.00	323,391.08	D By wife as trustee	—	—	(F1) 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) These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee.
5	Common	Common Stock	2026-03-23	G	A	264	$0.00	119,703	I	—	—
6	Common	Common Stock	2026-03-23	G	D	264	$0.00	32,164	I By wife	—	—