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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-12-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000101984</issuerCik>
        <issuerName>UNIVERSAL ELECTRONICS INC</issuerName>
        <issuerTradingSymbol>UEIC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001443284</rptOwnerCik>
            <rptOwnerName>Singer Eric</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O IMMERSION CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>2999 NE 191ST ST, STE 610</rptOwnerStreet2>
            <rptOwnerCity>AVENTURA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33180</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1544647</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Group</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3903</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2024-12-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6004</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6004</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9754</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Shares of the Issuer's Common Stock owned directly by Toro 18. Immersion, as the sole member of Toro 18, may be deemed to beneficially own the shares owned directly by Toro 18. Mr. Martin, as the Chief Strategy Officer of Toro 18, may be deemed to beneficially own the shares owned directly by Toro 18. Mr. Singer, as the President and Chief Executive Officer of Toro 18, may be deemed to beneficially own the securities owned directly by Toro 18.</footnote>
        <footnote id="F2">Each restricted stock unit represents a contingent right to receive one share of UEI common stock.</footnote>
        <footnote id="F3">Restricted stock units awarded on December 13, 2024 as supplemental director compensation and cliff vest on the earlier date of the Company's next Annual Meeting or June 30, 2025.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Eric Singer by Bryan Allison, pursuant to Limited Power of Attorney dated June 24, 2024</signatureName>
        <signatureDate>2024-12-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0508
4
2024-12-13
0
0000101984
UNIVERSAL ELECTRONICS INC
UEIC
0001443284
Singer Eric
C/O IMMERSION CORPORATION
2999 NE 191ST ST, STE 610
AVENTURA
FL
33180
1
0
1
0
0
Common Stock
1544647
I
By Group
Common Stock
3903
D
Restricted Stock Units
2024-12-13
4
A
0
6004
0
A
Common Stock
6004
9754
D
Shares of the Issuer's Common Stock owned directly by Toro 18. Immersion, as the sole member of Toro 18, may be deemed to beneficially own the shares owned directly by Toro 18. Mr. Martin, as the Chief Strategy Officer of Toro 18, may be deemed to beneficially own the shares owned directly by Toro 18. Mr. Singer, as the President and Chief Executive Officer of Toro 18, may be deemed to beneficially own the securities owned directly by Toro 18.
Each restricted stock unit represents a contingent right to receive one share of UEI common stock.
Restricted stock units awarded on December 13, 2024 as supplemental director compensation and cliff vest on the earlier date of the Company's next Annual Meeting or June 30, 2025.
/s/Eric Singer by Bryan Allison, pursuant to Limited Power of Attorney dated June 24, 2024
2024-12-17