Arthur J. Gallagher & Co. (AJG) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Arthur J. Gallagher & Co. (AJG) CIK: 0000354190 --- Reporting Owner --- Name: Miskel Christopher C. CIK: 0001804681 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-06-01 | Code: A (Grant or award) Shares: +194.081 | Price: $206.10 Total Value: $40,000.09 Shares Owned After: 10,641.773 | Ownership: D (Direct) Footnotes: [F1] This acquisition resulted from the reporting person's election in a prior year (pursuant to the Company's Director Deferral Plan) to defer the reporting person's annual cash retainer, which the Company pays on a quarterly basis, into deferred share units that will be distributed in the form of the Company's common stock. --- Footnotes (Complete Index) --- F1: This acquisition resulted from the reporting person's election in a prior year (pursuant to the Company's Director Deferral Plan) to defer the reporting person's annual cash retainer, which the Company pays on a quarterly basis, into deferred share units that will be distributed in the form of the Company's common stock. --- Signature --- /s/ /s/ Monica Norzagaray, by power of attorney (2026-06-02)