<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 043
<NAME> JOHN HANCOCK MID CAP GROWTH FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 306,598,357
<INVESTMENTS-AT-VALUE> 400,889,580
<RECEIVABLES> 15,850,571
<ASSETS-OTHER> 26,011
<OTHER-ITEMS-ASSETS> 668
<TOTAL-ASSETS> 416,766,830
<PAYABLE-FOR-SECURITIES> 3,025,877
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 602,958
<TOTAL-LIABILITIES> 3,628,835
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 265,076,104
<SHARES-COMMON-STOCK> 134,982
<SHARES-COMMON-PRIOR> 22,603
<ACCUMULATED-NII-CURRENT> (2,723,902)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 56,494,570
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 94,291,223
<NET-ASSETS> 413,137,995
<DIVIDEND-INCOME> 249,110
<INTEREST-INCOME> 212,571
<OTHER-INCOME> 171,753
<EXPENSES-NET> 3,341,006
<NET-INVESTMENT-INCOME> (2,707,572)
<REALIZED-GAINS-CURRENT> 57,371,617
<APPREC-INCREASE-CURRENT> 32,900,452
<NET-CHANGE-FROM-OPS> 87,564,497
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 30,130
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 115,362
<NUMBER-OF-SHARES-REDEEMED> 4,948
<SHARES-REINVESTED> 1,965
<NET-CHANGE-IN-ASSETS> 154,963,653
<ACCUMULATED-NII-PRIOR> (16,330)
<ACCUMULATED-GAINS-PRIOR> 17,410,317
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,443,253
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,341,006
<AVERAGE-NET-ASSETS> 1,082,498
<PER-SHARE-NAV-BEGIN> 12.21
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 4.21
<PER-SHARE-DIVIDEND> (0.88)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.40
<EXPENSE-RATIO> 2.15
</TABLE>
