<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 044
<NAME> State Street Research Large Cap Growth Fund - Class IV
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-2001
<PERIOD-START> FEB-01-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 1,365,921
<INVESTMENTS-AT-VALUE> 1,632,335
<RECEIVABLES> 12,733
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,645,068
<PAYABLE-FOR-SECURITIES> 3,600
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 301,474
<TOTAL-LIABILITIES> 305,074
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,031,546
<SHARES-COMMON-STOCK> 27,945
<SHARES-COMMON-PRIOR> 27,510
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 42,034
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 266,414
<NET-ASSETS> 1,339,994
<DIVIDEND-INCOME> 2,555
<INTEREST-INCOME> 350
<OTHER-INCOME> 0
<EXPENSES-NET> 3,436
<NET-INVESTMENT-INCOME> (531)
<REALIZED-GAINS-CURRENT> 42,035
<APPREC-INCREASE-CURRENT> 52,834
<NET-CHANGE-FROM-OPS> 94,338
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,869)
<DISTRIBUTIONS-OF-GAINS> (6,535)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 5,939
<NET-CHANGE-IN-ASSETS> 76,493
<ACCUMULATED-NII-PRIOR> 17,208
<ACCUMULATED-GAINS-PRIOR> 24,352
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,707
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,784
<AVERAGE-NET-ASSETS> 1,347,938
<PER-SHARE-NAV-BEGIN> 12.33
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.95
<PER-SHARE-DIVIDEND> (0.18)
<PER-SHARE-DISTRIBUTIONS> (0.24)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.86
<EXPENSE-RATIO> 0.40
</TABLE>