<SUBMISSION>
<ACCESSION-NUMBER>0001179110-09-017596
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20091230
<FILING-DATE>20091231
<DATE-OF-FILING-DATE-CHANGE>20091231
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>STERRETT STEPHEN E
<CIK>0001235739
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-14469
<FILM-NUMBER>091267865
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>115 W WASHINGTON ST
<CITY>INDIANAPOLIS
<STATE>IN
<ZIP>46204
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>SIMON PROPERTY GROUP INC /DE/
<CIK>0001063761
<ASSIGNED-SIC>6798
<IRS-NUMBER>046268599
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>225 WEST WASHINGTON STREET
<CITY>INDIANAPOLIS
<STATE>IN
<ZIP>46204-3438
<PHONE>317-636-1600
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>225 WEST WASHINGTON STREET
<CITY>INDIANAPOLIS
<STATE>IN
<ZIP>46204-3438
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>CORPORATE PROPERTY INVESTORS INC
<DATE-CHANGED>19980610
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-12-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001063761</issuerCik>
        <issuerName>SIMON PROPERTY GROUP INC /DE/</issuerName>
        <issuerTradingSymbol>SPG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001235739</rptOwnerCik>
            <rptOwnerName>STERRETT STEPHEN E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>225 W. WASHINGTON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>INDIANAPOLIS</rptOwnerCity>
            <rptOwnerState>IN</rptOwnerState>
            <rptOwnerZipCode>46204</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP/Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-12-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>14500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>81.13</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>117607</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Price of non-derivative securities is based on a weighted average price.  The stock sale prices range from 80.65 to 81.45.</footnote>
        <footnote id="F2">Includes 105 common shares acquired through the reinvestment of dividends received on common shares.</footnote>
        <footnote id="F3">Includes 2,786 common shares received on 3/18/09 as dividends. The Company's quarterly dividend was paid in a combination of cash and shares of common stock.  Includes 1,081 common shares received on 6/19/09 as dividends.  The Company's quarterly dividend was paid in a combination of cash and shares of common stock.  Includes 869 common shares received on 9/18/09 as dividends.  The Company's quarterly dividend was paid in a combination of cash and shares of common stock.  Also includes 768 common shares received on 12/18/09 as dividends.  The Company's quarterly dividend was paid in a combination of cash and shares of common stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Stephen E. Sterrett, and his attorney-in-fact, Shelly Doran</signatureName>
        <signatureDate>2009-12-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
