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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
354190	Arthur J. Gallagher & Co.	AJG	Insurance Agents, Brokers & Service (6411)	362151613

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1589933	Joseph Thomas Gallagher	2850 Golf Road Rolling Meadows IL 60008-4002	Vice President	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-02-08	37,300	$56.86	348,950	No	4	M	Direct
Common Stock	Disposition	2024-02-08	13,844	$237.69	335,106	No	4	F	Direct
Common Stock	Disposition	2024-02-08	12,309	$237.65	322,797	No	4	S	Direct
Common Stock	Acquisiton	2023-12-06	480	$0.00	117,840	No	5	G	Indirect	By wife as trustee

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	F	Direct
No	4	S	Direct
No	5	G	Indirect	By wife as trustee

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-qualified Stock Option	Disposition	2024-02-08	37,300	$0.00	37,300	$56.86

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2024-03-16	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	62,295	Indirect	By grantor retained annuity trust
Common Stock	66,709	Indirect	By Irrevocable Trust
Common Stock	32,428	Indirect	By wife
Common Stock	292	Indirect	Gallagher 401(k) plan account

Footnotes

The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $237.62 to $237.79. 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.
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.
These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee.
One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.