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    <isConfidential>false</isConfidential>
    <filerInfo>

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          <ccc>XXXXXXXX</ccc>
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        <classId>C000019521</classId>
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      <regName>LORD ABBETT SECURITIES TRUST</regName>
      <regFileNumber>811-07538</regFileNumber>
      <regCik>0000898031</regCik>
      <regLei>5493002HV0D15KTWO412</regLei>
      <regStreet1>90 HUDSON STREET</regStreet1>
      <regCity>JERSEY CITY</regCity>
      <regStateConditional regCountry="US" regState="US-NJ"/>
      <regZipOrPostalCode>07302</regZipOrPostalCode>
      <regPhone>201-827-2000</regPhone>
      <seriesName>Lord Abbett Alpha Strategy Fund</seriesName>
      <seriesId>S000007139</seriesId>
      <seriesLei>549300SWW68LOHCN3898</seriesLei>
      <repPdEnd>2020-10-31</repPdEnd>
      <repPdDate>2020-04-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totAssets>703966020.75</totAssets>
      <totLiabs>727442.05</totLiabs>
      <netAssets>703238578.70</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>60138.47000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000155670" rtn1="-7.73000000" rtn2="-21.34000000" rtn3="14.10000000"/>
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        <othMon2 netRealizedGain="-6382859.43000000" netUnrealizedAppr="-171844671.37000000"/>
        <othMon3 netRealizedGain="-5165607.76000000" netUnrealizedAppr="92661448.69000000"/>
      </returnInfo>
      <mon1Flow redemption="19047547.83000000" reinvestment="0.00000000" sales="6970157.06000000"/>
      <mon2Flow redemption="42642039.51000000" reinvestment="69.27000000" sales="27250209.96000000"/>
      <mon3Flow redemption="20134360.27000000" reinvestment="0.00000000" sales="7431419.36000000"/>

    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>Lord Abbett Micro Cap Growth Fund</name>
        <lei>549300VL8AMXUES9JL76</lei>
        <title>Lord Abbett Micro Cap Growth Fund</title>
        <cusip>54400V104</cusip>
        <identifiers>
          <isin value="US54400V1044"/>
        </identifiers>
        <balance>5403729.45800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>75327988.64000000</valUSD>
        <pctVal>10.71158365333</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Lord Abbett Value Opportunities Fund</name>
        <lei>549300DSLIHMAFWXRD49</lei>
        <title>Lord Abbett Value Opportunities Fund</title>
        <cusip>54400A506</cusip>
        <identifiers>
          <isin value="US54400A5065"/>
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        <balance>9127568.62900000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>141659865.12000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Lord Abbett International Opportunities Fund</name>
        <lei>DJROU6QIURETNZO2HV24</lei>
        <title>Lord Abbett International Opportunities Fund</title>
        <cusip>543915813</cusip>
        <identifiers>
          <isin value="US5439158131"/>
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        <balance>10146861.61500000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <pctVal>19.98383445199</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Lord Abbett Focused Small Cap Value Fund</name>
        <lei>549300TBYNRWTGRQG753</lei>
        <title>Lord Abbett Focused Small Cap Value Fund</title>
        <cusip>54400W102</cusip>
        <identifiers>
          <isin value="US54400W1027"/>
        </identifiers>
        <balance>3953545.30500000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>64561394.83000000</valUSD>
        <pctVal>9.180582064958</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Lord Abbett Developing Growth Fund Inc</name>
        <lei>549300HWJ2W28SDTJF85</lei>
        <title>Lord Abbett Developing Growth Fund Inc</title>
        <cusip>544006505</cusip>
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          <isin value="US5440065051"/>
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        <balance>6066450.03000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>143774865.71000000</valUSD>
        <pctVal>20.44467838720</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Lord Abbett Small Cap Value Fund</name>
        <lei>5493007UOPFNCNRUAX11</lei>
        <title>Lord Abbett Small Cap Value Fund</title>
        <cusip>543913800</cusip>
        <identifiers>
          <isin value="US5439138000"/>
        </identifiers>
        <balance>10202536.55600000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>137836268.87000000</valUSD>
        <pctVal>19.60021435752</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2020-05-19</ncom:dateSigned>
      <ncom:nameOfApplicant>LORD ABBETT SECURITIES TRUST</ncom:nameOfApplicant>
      <ncom:signature>Vito Fronda</ncom:signature>
      <ncom:signerName>Vito Fronda</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
