UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

Information Required In Proxy Statement

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

ARTHUR J. GALLAGHER & CO.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

 

Your Vote Counts! Smartphone users Point your camera here and vote without entering a control number complete information and to vote, visit www.ProxyVote.com Control # V34949-P05189 Vote Virtually at the Meeting* May 7, 2024 9:00 AM CDT * You can also vote by mail by requesting a paper copy of the materials, which will include a proxy card. ARTHUR J. GALLAGHER & CO. 2850 GOLF ROAD ROLLING MEADOWS, IL 60008-4050 2024 Annual Meeting To Be Held on May 7, 2024 Vote by May 6, 2024 11:59 PM EDT. For shares held in The Arthur J. Gallagher & Co. Employees’ 401(k) Savings and Thrift Plan, vote by May 2, 2024 5:00 PM EDT. ARTHUR J. GALLAGHER & CO. Get informed before you vote View the Notice of 2024 Annual Meeting and Proxy Statement and 2023 Annual Report online OR you can receive a free paper or email copy of the proxy materials by requesting it prior to April 23, 2024. If you would like to view the materials online, have the control number that is printed in the box below and visit: www.ProxyVote.com. If you would like to request a paper or email copy of the proxy material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless you request it, you will not otherwise receive a paper or email copy. You invested in ARTHUR J. GALLAGHER & CO. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the Annual Meeting of Stockholders to be held on May 7, 2024. The company will be hosting the meeting live via the Internet this year. To attend the meeting go to www.virtualshareholdermeeting.com/AJG2024. Have the control number that is printed above available and follow the instructions. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”.

 

Voting Items Board Recommends V34950-P05189 THIS IS NOT A VOTABLE BALLOT This is an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.ProxyVote.com or easily request a paper or email copy. We encourage you to access and review all of the important information contained in the proxy materials before voting. Company Proposals 1. Election of Directors Nominees: 1a. Sherry Barrat For 1b. Deborah Caplan For 1c. Teresa Clarke For 1d. John Coldman For 1e. Pat Gallagher For 1f. David Johnson For 1g. Chris Miskel For 1h. Ralph Nicoletti For 1i. Norman Rosenthal For 2. Ratification of the Appointment of Ernst & Young LLP as our Independent Auditor for the fiscal year ending December 31, 2024. For 3. Approval, on an Advisory Basis, of the Compensation of our Named Executive Officers. For