<SEC-DOCUMENT>0000034563-17-000120.txt : 20171204
<SEC-HEADER>0000034563-17-000120.hdr.sgml : 20171204
<ACCEPTANCE-DATETIME>20171204193024
ACCESSION NUMBER:		0000034563-17-000120
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171110
FILED AS OF DATE:		20171204
DATE AS OF CHANGE:		20171204

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KEOWN MICHAEL H
		CENTRAL INDEX KEY:			0001259767

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34249
		FILM NUMBER:		171238381

	MAIL ADDRESS:	
		STREET 1:		P O BOX 77057
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76177

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FARMER BROTHERS CO
		CENTRAL INDEX KEY:			0000034563
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS FOOD PREPARATIONS & KINDRED PRODUCTS [2090]
		IRS NUMBER:				950725980
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		1912 FARMER BROTHERS DRIVE
		CITY:			NORTHLAKE
		STATE:			TX
		ZIP:			76262
		BUSINESS PHONE:		888 998 2468

	MAIL ADDRESS:	
		STREET 1:		P O BOX 77057
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76177
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>wf-form4a_151243381078776.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2017-11-10</periodOfReport>

    <dateOfOriginalSubmission>2017-11-14</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000034563</issuerCik>
        <issuerName>FARMER BROTHERS CO</issuerName>
        <issuerTradingSymbol>FARM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001259767</rptOwnerCik>
            <rptOwnerName>KEOWN MICHAEL H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>FARMER BROS. CO.</rptOwnerStreet1>
            <rptOwnerStreet2>1912 FARMER BROTHERS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>NORTHLAKE</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76262</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>PRESIDENT, CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance-Based Restricted Stock Units (PBRSUs)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>31.7</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-11-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9464</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-11-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9464.0</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9464</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Corrected number of PBRSUs granted on November 10, 2017.</footnote>
        <footnote id="F2">Grant of performance-based restricted stock units (&quot;PBRSUs&quot;) under the  Farmer Bros. Co. 2017 Long-Term Incentive Plan. The target number of PBRSUs is presented in the table. Subject to certain continued employment conditions and subject to accelerated vesting in certain circumstances, the PBRSUs are scheduled to vest based on achievement of certain financial performance goals for the performance period July 1, 2017 through June 30, 2020. At the end of the three-year performance period, the number of PBRSUs that actually vest will be 0% to 150% of the target amount, depending on the extent to which Farmer Bros. Co. meets or exceeds certain financial performance goals measured over the full three-year performance period. The maximum number of PBRSUs that may vest at the end of the three-year performance period is 14,196 (150% of the target amount).</footnote>
        <footnote id="F3">Corrected number of PBRSUs beneficially owned after the reported transaction.</footnote>
    </footnotes>

    <remarks>This Form 4 is being amended to report the corrected number of PBRSUs granted to the Reporting Person on November 10, 2017, the corrected maximum number of PBRSUs that may vest at the end of the performance period, and the corrected number of PBRSUs beneficially owned after the reported transaction. Due to a computational error, the original filing on November 14, 2017 reported an incorrect number of PBRSUs granted, an incorrect maximum number of PBRSUs that may vest at the end of the performance period, and an incorrect number of PBRSUs beneficially owned after the reported transaction.</remarks>

    <ownerSignature>
        <signatureName>/s/ Thomas J. Mattei, Jr., Attorney-in-fact for Michael H. Keown</signatureName>
        <signatureDate>2017-12-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
