<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
STATEMENT OF ASSETS AND LIABILITIES, STATEMENT OF OPERATIONS, AND STATE-
MENT OF CHANGES IN NET ASSETS FOUND ON PAGES 108 THROUGH 139 OF THE FORTIS
SERIES FUND, INC. SEMI-ANNUAL SHAREHOLDER REPORT.
</LEGEND>
<CIK> 0000790558
<NAME> FORTIS SERIES FUND, INC.
<SERIES>
<NUMBER> 09
<NAME> AGGRESSIVE GROWTH SERIES
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 318,994,772
<INVESTMENTS-AT-VALUE> 428,515,689
<RECEIVABLES> 9,717,587
<ASSETS-OTHER> 49,278,400<F1>
<OTHER-ITEMS-ASSETS> 17,964
<TOTAL-ASSETS> 487,529,640
<PAYABLE-FOR-SECURITIES> 2,500,085
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 49,499,803<F1>
<TOTAL-LIABILITIES> 51,999,888
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 200,016,160
<SHARES-COMMON-STOCK> 11,504,698
<SHARES-COMMON-PRIOR> 9,859,699
<ACCUMULATED-NII-CURRENT> (416,118)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 126,408,793
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 109,520,917
<NET-ASSETS> 435,529,752
<DIVIDEND-INCOME> 202,123
<INTEREST-INCOME> 614,066
<OTHER-INCOME> 92,919<F2>
<EXPENSES-NET> (1,325,226)
<NET-INVESTMENT-INCOME> (416,118)
<REALIZED-GAINS-CURRENT> 44,374,826
<APPREC-INCREASE-CURRENT> (8,674,035)
<NET-CHANGE-FROM-OPS> 35,284,673
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,535,576
<NUMBER-OF-SHARES-REDEEMED> (890,577)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 102,371,813
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 82,033,967
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,269,324
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,325,226
<AVERAGE-NET-ASSETS> 404,189,321
<PER-SHARE-NAV-BEGIN> 33.79
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 4.11
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 37.86
<EXPENSE-RATIO> 0.65<F3>
<FN>
<F1>SECURITIES VALUED AT $49,072,549 WERE ON LOAN TO BROKERS FROM THE
PORTFOLIO. FOR COLLATERAL, THE PORTFOLIO'S CUSTODIAN RECEIVED $49,278,400
IN CASH.
<F2>SECURITY LENDING INCOME THROUGH JUNE 30, 2000.
<F3>ANNUALIZED.
</FN>
</TABLE>
