Arthur J. Gallagher & Co. — Director's Dealing 2025

Nov 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Arthur J. Gallagher & Co. (AJG)
CIK: 0000354190
Period of Report: 2025-11-03

Reporting Person: Pesch Michael Robert (Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-03	Common Stock	P	538	$245.853	Acquired	38386.6557	Direct
2025-11-03	Common Stock	P	1874	$246.822	Acquired	40260.6557	Direct
2025-11-03	Common Stock	P	989	$247.415	Acquired	41249.6557	Direct
2025-11-03	Common Stock	P	599	$248.717	Acquired	41848.6557	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	59	Indirect
Common Stock	12505	Indirect
Common Stock	418.699	Indirect

Footnotes

F1: The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $245.120 to $246.050. 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 ranges set forth in the footnotes to this Form 4.

F2: The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $246.160 to $247.120. 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 ranges set forth in the footnotes to this Form 4.

F3: The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $247.170 to $248.040. 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 ranges set forth in the footnotes to this Form 4.

F4: The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $248.290 to $248.970. 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 ranges set forth in the footnotes to this Form 4.

F5: Shares held in irrevocable trust, of which his spouse is sole Trustee.