Form 4 for AJG Arthur J. Gallagher & Co.

Accepted 2026-03-24 00:00:00 ET · period of report 2026-03-20 · accession 0000354190-26-000106 · 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
DI	2026-03-24	2026-03-23	AJG	Gallagher Patrick Murphy	COO	G - Gift	$0.00	+704	11.3K	+7%	$0
D	2026-03-24	2026-03-23	AJG	Gallagher Patrick Murphy	COO	G - Gift	$0.00	-704	14.1K	-5%	$0
D	2026-03-24	2026-03-20	AJG	Gallagher Patrick Murphy	COO	I - Discretionary	$214.82	+1,445	2,352	+159%	+$310.4K

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	A	704	$0.00	11,264	I	—	—
2	Common	Common Stock	2026-03-23	G	D	704	$0.00	14,071.66	D By Spouse as Trustee	—	—	(F1) Shares held in trusts, for the benefit of the reporting person's children, of which his wife is sole trustee.
3	Derivative	Notional Stock Units	2026-03-20	I	A	1,444.73	$214.82	2,351.80	D	— · — to —	1,444.73 Common Stock	(F5) The reporting person moved $310,357.10 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. (F4) Each notional stock unit represents a right to receive one share of Gallagher common stock. (F6) The notional stock units become payable following the reporting person's separation from service with Gallagher. (F7) The notional stock units become payable following the reporting person's separation from service with Gallagher.