<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-06-26</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001750737</rptOwnerCik>
            <rptOwnerName>HENDRICKS DANA S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>100 BROOKWOOD PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></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>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-06-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>45392</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
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                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>23720</value>
                </transactionShares>
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                <transactionAcquiredDisposedCode>
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            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23720</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                </directOrIndirectOwnership>
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        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
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                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>7686</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
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                <value>2026-06-26</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11778</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <expirationDate>
                <footnoteId id="F5"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                    <footnoteId id="F5"/>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On June 26, 2026, pursuant to that certain Agreement and Plan of Merger, dated as of March 19, 2025 (the &quot;Merger Agreement&quot;), among ProAssurance Corporation (the &quot;Issuer&quot;), The Doctors Company (&quot;Parent&quot;) and Jackson Acquisition Corporation, a wholly owned subsidiary of Parent (&quot;Merger Sub&quot;), Merger Sub merged with and into the Issuer (the &quot;Merger&quot;), with the Issuer surviving the Merger as a wholly owned subsidiary of Parent.</footnote>
        <footnote id="F2">Reflects an adjustment to the number of shares beneficially owned after a reconciliation of the Issuer's records.</footnote>
        <footnote id="F3">At the effective time of the Merger (the &quot;Effective Time&quot;), upon the terms and subject to the conditions set forth in the Merger Agreement, each share of the Issuer's common stock, par value $0.01 per share (the &quot;Common Stock&quot;) that was issued and outstanding immediately prior to the Effective Time (other than certain excluded shares) was cancelled and converted into the right to receive $25.00 per share in cash, without interest, and subject to any applicable withholding taxes (the &quot;Merger Consideration&quot;).</footnote>
        <footnote id="F4">Each restricted stock unit (&quot;RSU&quot;) represents a contingent right to receive one share of Common Stock.</footnote>
        <footnote id="F5">Represents outstanding unvested RSUs (other than certain excluded RSUs, which were forfeited at the Effective Time in accordance with their terms). At the Effective Time, upon the terms and subject to the conditions set forth in the Merger Agreement, the outstanding, unvested time-based and performance-based RSUs (other than the excluded RSUs) automatically and immediately vested and were cancelled and entitled the holder to receive an amount in cash, without interest, equal to the product of (a) the total number of shares of Common Stock subject to the RSUs immediately prior to the Effective Time, multiplied by (b) the Merger Consideration.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Lee M. Pope, POA for Reporting Person</signatureName>
        <signatureDate>2026-06-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
