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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-10-16</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001058623</issuerCik>
        <issuerName>CUMULUS MEDIA INC</issuerName>
        <issuerTradingSymbol>CMLS</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001807779</rptOwnerCik>
            <rptOwnerName>Lopez-Balboa Francisco J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O CUMULUS MEDIA INC.</rptOwnerStreet1>
            <rptOwnerStreet2>780 JOHNSON FERRY ROAD NE SUITE 500</rptOwnerStreet2>
            <rptOwnerCity>ATLANTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30342</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock, par value $0.0000001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2026-10-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>492956</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On March 4, 2026, the Company and certain of its direct and indirect subsidiaries (collectively with the Company, the &quot;Company Parties&quot;) commenced filing voluntary petitions (the &quot;Chapter 11 Cases&quot;) in the United States Bankruptcy Court for the Southern District of Texas (the &quot;Bankruptcy Court&quot;) seeking relief under Chapter 11 of Title 11 of the United States Code. On March 5, 2026, the Company Parties filed the Disclosure Statement for the Joint Prepackaged Chapter 11 Plan of Reorganization of Cumulus Media Inc. and Its Debtor Affiliates and the Joint Prepackaged Chapter 11 Plan of Reorganization of Cumulus Media Inc. and Its Debtor Affiliates in the Chapter 11 Cases in the Bankruptcy Court. On April 13, 2026, the Company Parties filed the Modified Joint Prepackaged Chapter 11 Plan of Reorganization of Cumulus Media Inc. and Its Debtor Affiliates (as may be amended or supplemented from time to time in accordance with its terms, the &quot;Plan&quot;).</footnote>
        <footnote id="F2">On April 15, 2026, the Bankruptcy Court entered an order confirming the Plan (the &quot;Confirmation Order&quot;). On October 16, 2026 (the &quot;Effective Date&quot;), the Company Parties satisfied the conditions to effectiveness of the Plan set forth in the Confirmation Order and the Plan, the Plan became effective in accordance with its terms and the Company Parties emerged from Chapter 11.</footnote>
        <footnote id="F3">On the Effective Date, all of the Company's issued and outstanding shares of common stock, including the Company's Class A Common Stock, par value $0.0000001 per share, were cancelled and extinguished pursuant to the Plan.</footnote>
    </footnotes>

    <remarks>Executive Vice President and Chief Financial Officer</remarks>

    <ownerSignature>
        <signatureName>/s/ Richard S. Denning, Attorney-in-Fact</signatureName>
        <signatureDate>2026-10-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
