<SEC-DOCUMENT>0001704084-19-000053.txt : 20191007
<SEC-HEADER>0001704084-19-000053.hdr.sgml : 20191007
<ACCEPTANCE-DATETIME>20191007161538
ACCESSION NUMBER:		0001704084-19-000053
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20191003
FILED AS OF DATE:		20191007
DATE AS OF CHANGE:		20191007

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Boguski Michael Leonard
		CENTRAL INDEX KEY:			0001352245

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-16533
		FILM NUMBER:		191141043

	MAIL ADDRESS:	
		STREET 1:		25 RACE AVENUE
		CITY:			LANCASTER
		STATE:			PA
		ZIP:			17603

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PROASSURANCE CORP
		CENTRAL INDEX KEY:			0001127703
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				631261433
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 BROOKWOOD PLACE
		CITY:			BIRMINGHAM
		STATE:			AL
		ZIP:			35209
		BUSINESS PHONE:		2058774400
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_157047931279001.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-10-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001127703</issuerCik>
        <issuerName>PROASSURANCE CORP</issuerName>
        <issuerTradingSymbol>PRA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001352245</rptOwnerCik>
            <rptOwnerName>Boguski Michael Leonard</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PROASSURANCE CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>100 BROOKWOOD PLACE</rptOwnerStreet2>
            <rptOwnerCity>BIRMINGHAM</rptOwnerCity>
            <rptOwnerState>AL</rptOwnerState>
            <rptOwnerZipCode>35209</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President of a Subsidiary</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-10-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>51</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>38.72</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>32575</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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                <value>Common Stock</value>
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                <transactionCode>M</transactionCode>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                <sharesOwnedFollowingTransaction>
                    <value>32625</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
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            <exerciseDate>
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            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>27459.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27459</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <footnoteId id="F4"/>
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            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3886.0</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
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                    <value>D</value>
                </directOrIndirectOwnership>
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        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
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            <transactionDate>
                <value>2019-10-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>90</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>90.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        <derivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3000</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-10-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>93</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F1"/>
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            <expirationDate>
                <footnoteId id="F1"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>93.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Transactions as a result of the vesting of Restricted Share Units (RSUs) issued to the reporting person on 10/5/16 under the 2008 Equity Plan and acquired under terms of the ProAssurance Corporation 2011 Employee Stock Ownership Plan. Each RSU is equal to one share of Common Stock and vested upon the completion of three years of continuous employment. Vesting of 93 shares reduced by withholding of 42 shares to cover tax liability resulting from the maturation of this award.</footnote>
        <footnote id="F2">Transactions as a result of the vesting of Restricted Share Units (RSUs) issued to the reporting person on 10/5/17 under the 2008 Equity Plan and acquired under terms of the ProAssurance Corporation 2011 Employee Stock Ownership Plan. Each RSU is equal to one share of Common Stock and vested upon the completion of three years of continuous employment. Vesting of 90 shares reduced by withholding of 40 shares to cover tax liability resulting from the maturation of this award.</footnote>
        <footnote id="F3">Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of ProAssurance Corporation common stock, issuable from the ProAssurance Corporation 2014 Equity Incentive Compensation Plan. The RSUs will vest if the reporting person remains continuously employed by ProAssurance or one of its subsidiaries until December 31, 2021 (three years from date of grant). Vesting will accelerate upon termination of employment as the result of (i) death; (ii) disability; or (iii) Good Reason, as defined in the reporting person's employment agreement with ProAssurance Corporation, or by action of the Compensation Committee of the ProAssurance Corporation Board of Directors. The RSUs will be settled in shares of ProAssurance Common Stock and in cash, with the cash portion being approximately equal to the federal, state, and local taxes.</footnote>
        <footnote id="F4">Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of ProAssurance Corporation common stock, issuable from the ProAssurance Corporation 2014 Equity Incentive Compensation Plan. The RSUs will vest if the reporting person remains continuously employed by ProAssurance or one of its subsidiaries until December 31, 2020 (three years from date of grant). Vesting will accelerate upon termination of employment as the result of (i) death; (ii) disability; or (iii) Good Reason, as defined in the reporting person's employment agreement with ProAssurance Corporation, or by action of the Compensation Committee of the ProAssurance Corporation Board of Directors. The RSUs will be settled in shares of ProAssurance Common Stock and in cash, with the cash portion being approximately equal to the federal, state, and local taxes.</footnote>
        <footnote id="F5">Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of ProAssurance Corporation common stock, issuable from the ProAssurance Corporation 2014 Equity Incentive Compensation Plan. The RSUs will vest if the reporting person remains continuously employed by ProAssurance or one of its subsidiaries until December 31, 2019 (three years from date of grant). Vesting will accelerate upon termination of employment as the result of (i) death; (ii) disability; or (iii) Good Reason, as defined in the reporting person's employment agreement with ProAssurance Corporation, or by action of the Compensation Committee of the ProAssurance Corporation Board of Directors. The RSUs will be settled in shares of ProAssurance Common Stock and in cash, with the cash portion being approximately equal to the federal, state, and local taxes.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Michael L. Boguski</signatureName>
        <signatureDate>2019-10-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
