<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000898031
<NAME> LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER> 071
<NAME> MICRO-CAP GROWTH SERIES - CLASS Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 2,364,512
<INVESTMENTS-AT-VALUE> 2,178,707
<RECEIVABLES> 0
<ASSETS-OTHER> 27,816
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,206,523
<PAYABLE-FOR-SECURITIES> 28,350
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,633
<TOTAL-LIABILITIES> 38,983
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,949,740
<SHARES-COMMON-STOCK> 597
<SHARES-COMMON-PRIOR> 111,635
<ACCUMULATED-NII-CURRENT> 1,001
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 402,604
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (185,805)
<NET-ASSETS> 7,879
<DIVIDEND-INCOME> 694
<INTEREST-INCOME> 4,384
<OTHER-INCOME> 0
<EXPENSES-NET> 3,702
<NET-INVESTMENT-INCOME> 1,376
<REALIZED-GAINS-CURRENT> 403,403
<APPREC-INCREASE-CURRENT> (211,279)
<NET-CHANGE-FROM-OPS> 193,500
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,266)
<DISTRIBUTIONS-OF-GAINS> (131,886)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 36,492
<NUMBER-OF-SHARES-REDEEMED> (158,186)
<SHARES-REINVESTED> 10,655
<NET-CHANGE-IN-ASSETS> 763,961
<ACCUMULATED-NII-PRIOR> 1,891
<ACCUMULATED-GAINS-PRIOR> 131,087
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 31,528
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 52,634
<AVERAGE-NET-ASSETS> 1,029,058
<PER-SHARE-NAV-BEGIN> 12.57
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 1.73
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> (1.11)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.21
<EXPENSE-RATIO> 0.00
</TABLE>