144Filing Date: Aug 19, 2026

Arthur J. Gallagher & (AJG)

Insider Proposed Sale Notice

Mead Christopher E

Officer·Arthur J. Gallagher &

Proposed

CommonNYSE

Shares3.50K

Est. DateAug 19

Market Value$899.6K

BrokerFidelity Brokerage Services LLC

AcquisitionStock Option Exercise · Issuer

Acquired DateAug 19, 2026

Amount Acquired3.50K

% Outstanding0.0014%

Exercise / Payment Details

Paid: Aug 19, 2026Method: Cash

No sales in the past 3 months

Signature & Compliance expand_more

Notice DateAug 19, 2026

Signature /s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Christopher Mead

Issuer Info expand_more

CompanyArthur J. Gallagher & Co.

CIK0000354190

SEC File No.001-09761

Phone630-773-3800

Address2850 GOLF ROAD, ROLLING MEADOWS, IL 60008-4050