<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000897111
<NAME> HERITAGE SERIES TRUST
<SERIES>
<NUMBER> 051
<NAME> MID CAP STOCK FUND CLASS A SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 28,589,623
<INVESTMENTS-AT-VALUE> 35,327,075
<RECEIVABLES> 4,728,142
<ASSETS-OTHER> 2,698,473
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 42,753,690
<PAYABLE-FOR-SECURITIES> 3,462,848
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 113,194
<TOTAL-LIABILITIES> 3,576,042
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 25,580,667
<SHARES-COMMON-STOCK> 1,705,842
<SHARES-COMMON-PRIOR> 1,572,048
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,859,529
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6,737,452
<NET-ASSETS> 39,177,648
<DIVIDEND-INCOME> 54,097
<INTEREST-INCOME> 81,676
<OTHER-INCOME> 0
<EXPENSES-NET> 593,993
<NET-INVESTMENT-INCOME> (458,220)
<REALIZED-GAINS-CURRENT> 7,368,412
<APPREC-INCREASE-CURRENT> 3,331,490
<NET-CHANGE-FROM-OPS> 10,241,682
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 438,216
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 487,740
<NUMBER-OF-SHARES-REDEEMED> 377,080
<SHARES-REINVESTED> 23,134
<NET-CHANGE-IN-ASSETS> 13,308,888
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 387,553
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 240,166
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 294,530
<AVERAGE-NET-ASSETS> 19,002,174
<PER-SHARE-NAV-BEGIN> 16.56
<PER-SHARE-NII> (0.24)
<PER-SHARE-GAIN-APPREC> 7.17
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.30
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 23.19
<EXPENSE-RATIO> 1.55
</TABLE>
