The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.
  UNITED STATES SECURITIES AND EXCHANGE COMMISSION OMB APPROVAL
  Washington, D.C. 20549
FORM 13F		 OMB Number:   3235-0006
Expires:          July 31, 2015
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FORM 13F COVER PAGE


Report for the Calendar Year or Quarter Ended:
03-31-2023
 
Check here if Amendment:      Amendment Number:
 
This Amendment (Check only one.):      is a restatement.
       adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name: Arthur J. Gallagher & Co. 
Address: 2850 GOLF ROAD 
  ROLLING MEADOWS  IL  60008-4050 
Form 13F File Number:   028-14530 
CRD Number (if applicable):    
SEC File Number (if applicable):    

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name: Seth Diehl 
Title: Assistant Secretary 
Phone: 630-773-3800 

Signature, Place, and Date of Signing:

/s/Seth Diehl  Rolling Meadows,  ILLINOIS 05-15-2023 
[Signature] [City, State] [Date]

Do you wish to provide information pursuant to Special Instruction 5?        Yes      X  No

Report Type (Check only one.):

     13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)

X  13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)

     13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)


List of Other Managers Reporting for this Manager
[If there are no entries in this list, omit this section.]

Name Form 13F File No. CRD No. (if applicable) SEC File No. (if applicable)
Gallagher Fiduciary Advisors, LLC  028-14533     
Arthur J Gallagher (NYSE:AJG)
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