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

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    <periodOfReport>2026-02-04</periodOfReport>

    <issuer>
        <issuerCik>0000024741</issuerCik>
        <issuerName>CORNING INC /NY</issuerName>
        <issuerTradingSymbol>GLW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001824828</rptOwnerCik>
            <rptOwnerName>Nelson Avery H III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE RIVERFRONT PLAZA</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CORNING</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>14831</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Executive Vice President &amp; COO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Trustee u/Employee Benefit Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

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    <footnotes>
        <footnote id="F1">Each performance share unit represents a contingent right to receive one share of Corning Incorporated common stock.</footnote>
        <footnote id="F2">Ownership is represented by units held in a unitized stock fund through the issuer's 401(k) retirement plan as of January 31, 2026.</footnote>
        <footnote id="F3">Performance share units (PSUs) were earned February 4, 2026 per Compensation Committee decision that performance criteria were satisfied for fiscal year 2025 pursuant to the 2025 agreement. Earned PSUs remain restricted until April 14, 2028, when they vest and convert to common stock, subject to service-based vesting requirement.</footnote>
        <footnote id="F4">Performance share units (PSUs) were earned February 4, 2026 per Compensation Committee decision that performance criteria were satisfied for fiscal year 2025 pursuant to the 2024 agreement. Earned PSUs remain restricted until April 15, 2027, when they vest and convert to common stock, subject to service-based vesting requirement.</footnote>
        <footnote id="F5">Performance share units (PSUs) were earned February 4, 2026 per Compensation Committee decision that performance criteria were satisfied for fiscal year 2025 pursuant to the 2023 agreement. Earned PSUs remain restricted until April 15, 2026, when they vest and convert to common stock, subject to service-based vesting requirement.</footnote>
        <footnote id="F6">Vesting to satisfy tax requirement pursuant to the 2025 agreement.</footnote>
        <footnote id="F7">Vesting to satisfy tax requirement pursuant to the 2024 agreement.</footnote>
        <footnote id="F8">Vesting to satisfy tax requirement pursuant to the 2023 agreement.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Melissa J. Gambol, Power of Attorney</signatureName>
        <signatureDate>2026-02-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
