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Bay Walter D. – ‘4’ for 12/16/19 re: Arthur J. Gallagher & Co.

On:  Wednesday, 12/18/19, at 5:59pm ET   ·   For:  12/16/19   ·   Accession #:  1127602-19-35425   ·   File #:  1-09761

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

12/18/19  Bay Walter D.                     4                      1:10K  Arthur J. Gallagher & Co.         Restricted Stock Sy… Inc

Statement of Changes in Beneficial Ownership of Securities by an Insider   —   Form 4   —   SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 4           Statement of Changes in Beneficial Ownership of     HTML      3K 
                Securities by an Insider -- form4.xml/3.6


        

This ‘4’ Document is an XML Data File that may be rendered in various formats:

  Form 4    –   Plain Text   –  SEC Website  –  EDGAR System  –    XML Data    –  <?xml?> File
 
 
XML Data rendering:  Statement of Changes in Beneficial Ownership of Securities by an Insider
 
                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<ownershipDocument>
<schemaVersion> X0306 </schemaVersion>
<documentType> 4 </documentType>
<periodOfReport> 2019-12-16 </periodOfReport>
<issuer>
<issuerCik> 0000354190 </issuerCik>
<issuerName> ARTHUR J. GALLAGHER & CO. </issuerName>
<issuerTradingSymbol> AJG </issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik> 0001410235 </rptOwnerCik>
<rptOwnerName> Bay Walter D. </rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1> 2850 GOLF ROAD </rptOwnerStreet1>
<rptOwnerStreet2></rptOwnerStreet2>
<rptOwnerCity> ROLLING MEADOWS </rptOwnerCity>
<rptOwnerState> IL </rptOwnerState>
<rptOwnerZipCode> 60008-4002 </rptOwnerZipCode>
<rptOwnerStateDescription></rptOwnerStateDescription>
</reportingOwnerAddress>
<reportingOwnerRelationship>
<isOfficer> 1 </isOfficer>
<officerTitle> General Counsel </officerTitle>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeTransaction>
<securityTitle>
<value> Common Stock </value>
</securityTitle>
<transactionDate>
<value> 2019-12-16 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> M </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 53300 </value>
</transactionShares>
<transactionPricePerShare>
<value> 46.87 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> A </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 67644 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
<nonDerivativeTransaction>
<securityTitle>
<value> Common Stock </value>
</securityTitle>
<transactionDate>
<value> 2019-12-16 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> F </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 38206 </value>
</transactionShares>
<transactionPricePerShare>
<value> 95.35 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 29438 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
<nonDerivativeTransaction>
<securityTitle>
<value> Common Stock </value>
</securityTitle>
<transactionDate>
<value> 2019-12-16 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> S </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 1944 </value>
</transactionShares>
<transactionPricePerShare>
<value> 95.32 </value>
<footnoteId id="F1"/>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 27494 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
<nonDerivativeTransaction>
<securityTitle>
<value> Common Stock </value>
</securityTitle>
<transactionDate>
<value> 2019-12-17 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> S </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 13150 </value>
</transactionShares>
<transactionPricePerShare>
<value> 95.30 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 14344 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<derivativeTable>
<derivativeTransaction>
<securityTitle>
<value> Non-qualified Stock Option </value>
</securityTitle>
<conversionOrExercisePrice>
<value> 46.87 </value>
</conversionOrExercisePrice>
<transactionDate>
<value> 2019-12-16 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> M </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 40000 </value>
</transactionShares>
<transactionPricePerShare>
<value> 0 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<exerciseDate>
<footnoteId id="F2"/>
</exerciseDate>
<expirationDate>
<value> 2021-03-12 </value>
</expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value> Common Stock </value>
</underlyingSecurityTitle>
<underlyingSecurityShares>
<value> 40000 </value>
</underlyingSecurityShares>
</underlyingSecurity>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 0 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeTransaction>
<derivativeTransaction>
<securityTitle>
<value> Non-qualified Stock Option </value>
</securityTitle>
<conversionOrExercisePrice>
<value> 46.87 </value>
</conversionOrExercisePrice>
<transactionDate>
<value> 2019-12-16 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> M </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 13300 </value>
</transactionShares>
<transactionPricePerShare>
<value> 0 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<exerciseDate>
<footnoteId id="F2"/>
</exerciseDate>
<expirationDate>
<value> 2021-03-12 </value>
</expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value> Common Stock </value>
</underlyingSecurityTitle>
<underlyingSecurityShares>
<value> 13300 </value>
</underlyingSecurityShares>
</underlyingSecurity>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 0 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeTransaction>
</derivativeTable>
<footnotes>
<footnote id="F1"> The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $93.30 to $95.33. 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 range set forth in this footnote </footnote>
<footnote id="F2"> One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date. </footnote>
</footnotes>
<ownerSignature>
<signatureName> /s/ April Hanes-Dowd, by power of attorney </signatureName>
<signatureDate> 2019-12-18 </signatureDate>
</ownerSignature>
</ownershipDocument>


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Filing Submission 0001127602-19-035425   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
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