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<PAGE> PAGE 3
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<PAGE> PAGE 11
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<PAGE> PAGE 13
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<PAGE> PAGE 19
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<PAGE> PAGE 41
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<PAGE> PAGE 42
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<PAGE> PAGE 43
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<PAGE> PAGE 44
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<PAGE> PAGE 45
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<PAGE> PAGE 46
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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
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<PAGE> PAGE 50
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<PAGE> PAGE 51
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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<PAGE> PAGE 54
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<PAGE> PAGE 55
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<PAGE> PAGE 56
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SIGNATURE CHRISTOPHER G ROETZER
TITLE VP & PRIN ACCT OFFR
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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<SHARES-REINVESTED> 161
<NET-CHANGE-IN-ASSETS> 14,278
<ACCUMULATED-NII-PRIOR> (382)
<ACCUMULATED-GAINS-PRIOR> 3,842
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 227
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 506
<AVERAGE-NET-ASSETS> 5,894
<PER-SHARE-NAV-BEGIN> 18.58
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 3.31
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.45
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.30
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND AGGRESSIVE GROWTH
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 063
<NAME> AGGRESSIVE GROWTH PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 41,168
<INVESTMENTS-AT-VALUE> 53,966
<RECEIVABLES> 793
<ASSETS-OTHER> 7
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 54,766
<PAYABLE-FOR-SECURITIES> 768
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 112
<TOTAL-LIABILITIES> 880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 39,167
<SHARES-COMMON-STOCK> 222
<SHARES-COMMON-PRIOR> 186
<ACCUMULATED-NII-CURRENT> (275)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,196
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 12,798
<NET-ASSETS> 53,886
<DIVIDEND-INCOME> 142
<INTEREST-INCOME> 36
<OTHER-INCOME> 0
<EXPENSES-NET> 449
<NET-INVESTMENT-INCOME> (271)
<REALIZED-GAINS-CURRENT> 2,225
<APPREC-INCREASE-CURRENT> 6,079
<NET-CHANGE-FROM-OPS> 8,033
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 110
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,642
<NUMBER-OF-SHARES-REDEEMED> 1,068
<SHARES-REINVESTED> 110
<NET-CHANGE-IN-ASSETS> 14,278
<ACCUMULATED-NII-PRIOR> (382)
<ACCUMULATED-GAINS-PRIOR> 3,842
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 227
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 506
<AVERAGE-NET-ASSETS> 4,013
<PER-SHARE-NAV-BEGIN> 18.61
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 3.31
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.45
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.33
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INTERNATIONAL EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 121
<NAME> INTERNATIONAL EQUITY PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 4,660
<INVESTMENTS-AT-VALUE> 5,428
<RECEIVABLES> 124
<ASSETS-OTHER> 97
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5,649
<PAYABLE-FOR-SECURITIES> 45
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 24
<TOTAL-LIABILITIES> 69
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,889
<SHARES-COMMON-STOCK> 337
<SHARES-COMMON-PRIOR> 291
<ACCUMULATED-NII-CURRENT> (11)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (73)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 775
<NET-ASSETS> 5,580
<DIVIDEND-INCOME> 31
<INTEREST-INCOME> 7
<OTHER-INCOME> 0
<EXPENSES-NET> 49
<NET-INVESTMENT-INCOME> (11)
<REALIZED-GAINS-CURRENT> (42)
<APPREC-INCREASE-CURRENT> 845
<NET-CHANGE-FROM-OPS> 792
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 19
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 771
<NUMBER-OF-SHARES-REDEEMED> 216
<SHARES-REINVESTED> 20
<NET-CHANGE-IN-ASSETS> 1,516
<ACCUMULATED-NII-PRIOR> 1
<ACCUMULATED-GAINS-PRIOR> (11)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 3,517
<PER-SHARE-NAV-BEGIN> 10.57
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 1.85
<PER-SHARE-DIVIDEND> 0.07
<PER-SHARE-DISTRIBUTIONS> 0.07
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.34
<EXPENSE-RATIO> 1.93%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INTERNATIONAL EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 122
<NAME> INTERNATIONAL EQUITY PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 4,660
<INVESTMENTS-AT-VALUE> 5,428
<RECEIVABLES> 124
<ASSETS-OTHER> 97
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5,649
<PAYABLE-FOR-SECURITIES> 45
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 24
<TOTAL-LIABILITIES> 69
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,889
<SHARES-COMMON-STOCK> 74
<SHARES-COMMON-PRIOR> 56
<ACCUMULATED-NII-CURRENT> (11)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (73)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 775
<NET-ASSETS> 5,580
<DIVIDEND-INCOME> 31
<INTEREST-INCOME> 7
<OTHER-INCOME> 0
<EXPENSES-NET> 49
<NET-INVESTMENT-INCOME> (11)
<REALIZED-GAINS-CURRENT> (42)
<APPREC-INCREASE-CURRENT> 845
<NET-CHANGE-FROM-OPS> 792
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 239
<NUMBER-OF-SHARES-REDEEMED> 46
<SHARES-REINVESTED> 1
<NET-CHANGE-IN-ASSETS> 1,516
<ACCUMULATED-NII-PRIOR> 1
<ACCUMULATED-GAINS-PRIOR> (11)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 749
<PER-SHARE-NAV-BEGIN> 10.52
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 1.85
<PER-SHARE-DIVIDEND> 0.01
<PER-SHARE-DISTRIBUTIONS> 0.01
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.32
<EXPENSE-RATIO> 2.58%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INTERNATIONAL EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 123
<NAME> INTERNATIONAL EQUITY PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 4,660
<INVESTMENTS-AT-VALUE> 5,428
<RECEIVABLES> 124
<ASSETS-OTHER> 97
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5,649
<PAYABLE-FOR-SECURITIES> 45
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 24
<TOTAL-LIABILITIES> 69
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,889
<SHARES-COMMON-STOCK> 41
<SHARES-COMMON-PRIOR> 38
<ACCUMULATED-NII-CURRENT> (11)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (73)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 775
<NET-ASSETS> 5,580
<DIVIDEND-INCOME> 31
<INTEREST-INCOME> 7
<OTHER-INCOME> 0
<EXPENSES-NET> 49
<NET-INVESTMENT-INCOME> (11)
<REALIZED-GAINS-CURRENT> (42)
<APPREC-INCREASE-CURRENT> 845
<NET-CHANGE-FROM-OPS> 792
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 121
<NUMBER-OF-SHARES-REDEEMED> 86
<SHARES-REINVESTED> 1
<NET-CHANGE-IN-ASSETS> 1,516
<ACCUMULATED-NII-PRIOR> 1
<ACCUMULATED-GAINS-PRIOR> (11)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 439
<PER-SHARE-NAV-BEGIN> 10.53
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 1.85
<PER-SHARE-DIVIDEND> 0.02
<PER-SHARE-DISTRIBUTIONS> 0.02
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.32
<EXPENSE-RATIO> 2.48%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND CAPITAL APPRECIATION
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 071
<NAME> CAPITAL APPRECIATION PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,973
<INVESTMENTS-AT-VALUE> 29,780
<RECEIVABLES> 390
<ASSETS-OTHER> 30
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 30,200
<PAYABLE-FOR-SECURITIES> 323
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 117
<TOTAL-LIABILITIES> 440
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,663
<SHARES-COMMON-STOCK> 1,357
<SHARES-COMMON-PRIOR> 1,296
<ACCUMULATED-NII-CURRENT> (206)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,535
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5,798
<NET-ASSETS> 29,760
<DIVIDEND-INCOME> 35
<INTEREST-INCOME> 22
<OTHER-INCOME> 0
<EXPENSES-NET> 261
<NET-INVESTMENT-INCOME> (204)
<REALIZED-GAINS-CURRENT> 2,529
<APPREC-INCREASE-CURRENT> 2,284
<NET-CHANGE-FROM-OPS> 4,609
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 590
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 18,325
<NUMBER-OF-SHARES-REDEEMED> 18,019
<SHARES-REINVESTED> 585
<NET-CHANGE-IN-ASSETS> 4,538
<ACCUMULATED-NII-PRIOR> (331)
<ACCUMULATED-GAINS-PRIOR> 778
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 133
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 324
<AVERAGE-NET-ASSETS> 22,070
<PER-SHARE-NAV-BEGIN> 15.90
<PER-SHARE-NII> (0.12)
<PER-SHARE-GAIN-APPREC> 2.89
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.45
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.22
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND CAPITAL APPRECIATION
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 072
<NAME> CAPITAL APPRECIATION PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,973
<INVESTMENTS-AT-VALUE> 29,780
<RECEIVABLES> 390
<ASSETS-OTHER> 30
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 30,200
<PAYABLE-FOR-SECURITIES> 323
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 117
<TOTAL-LIABILITIES> 440
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,663
<SHARES-COMMON-STOCK> 191
<SHARES-COMMON-PRIOR> 182
<ACCUMULATED-NII-CURRENT> (206)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,535
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5,798
<NET-ASSETS> 29,760
<DIVIDEND-INCOME> 35
<INTEREST-INCOME> 22
<OTHER-INCOME> 0
<EXPENSES-NET> 261
<NET-INVESTMENT-INCOME> (204)
<REALIZED-GAINS-CURRENT> 2,529
<APPREC-INCREASE-CURRENT> 2,284
<NET-CHANGE-FROM-OPS> 4,609
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 82
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 462
<NUMBER-OF-SHARES-REDEEMED> 399
<SHARES-REINVESTED> 81
<NET-CHANGE-IN-ASSETS> 4,538
<ACCUMULATED-NII-PRIOR> (331)
<ACCUMULATED-GAINS-PRIOR> 778
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 133
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 324
<AVERAGE-NET-ASSETS> 3,091
<PER-SHARE-NAV-BEGIN> 15.74
<PER-SHARE-NII> (0.17)
<PER-SHARE-GAIN-APPREC> 2.89
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.45
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.01
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND CAPITAL APPRECIATION
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 073
<NAME> CAPITAL APPRECIATION PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,973
<INVESTMENTS-AT-VALUE> 29,780
<RECEIVABLES> 390
<ASSETS-OTHER> 30
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 30,200
<PAYABLE-FOR-SECURITIES> 323
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 117
<TOTAL-LIABILITIES> 440
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,663
<SHARES-COMMON-STOCK> 88
<SHARES-COMMON-PRIOR> 111
<ACCUMULATED-NII-CURRENT> (206)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,535
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5,798
<NET-ASSETS> 29,760
<DIVIDEND-INCOME> 35
<INTEREST-INCOME> 22
<OTHER-INCOME> 0
<EXPENSES-NET> 261
<NET-INVESTMENT-INCOME> (204)
<REALIZED-GAINS-CURRENT> 2,529
<APPREC-INCREASE-CURRENT> 2,284
<NET-CHANGE-FROM-OPS> 4,609
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 47
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 229
<NUMBER-OF-SHARES-REDEEMED> 662
<SHARES-REINVESTED> 46
<NET-CHANGE-IN-ASSETS> 4,538
<ACCUMULATED-NII-PRIOR> (331)
<ACCUMULATED-GAINS-PRIOR> 778
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 133
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 324
<AVERAGE-NET-ASSETS> 1,674
<PER-SHARE-NAV-BEGIN> 15.77
<PER-SHARE-NII> (0.17)
<PER-SHARE-GAIN-APPREC> 2.89
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.45
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.04
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GLOBAL PORTFOLIO FOR
THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 041
<NAME> GLOBAL PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 297,017
<INVESTMENTS-AT-VALUE> 402,147
<RECEIVABLES> 3,516
<ASSETS-OTHER> 1,205
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 406,868
<PAYABLE-FOR-SECURITIES> 442
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,701
<TOTAL-LIABILITIES> 2,143
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 300,412
<SHARES-COMMON-STOCK> 10,725
<SHARES-COMMON-PRIOR> 9,212
<ACCUMULATED-NII-CURRENT> (1,008)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 532
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 104,789
<NET-ASSETS> 404,725
<DIVIDEND-INCOME> 1,902
<INTEREST-INCOME> 332
<OTHER-INCOME> 0
<EXPENSES-NET> 3,226
<NET-INVESTMENT-INCOME> (992)
<REALIZED-GAINS-CURRENT> (180)
<APPREC-INCREASE-CURRENT> 69,032
<NET-CHANGE-FROM-OPS> 67,860
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 19,123
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 97,864
<NUMBER-OF-SHARES-REDEEMED> 83,054
<SHARES-REINVESTED> 18,617
<NET-CHANGE-IN-ASSETS> 114,883
<ACCUMULATED-NII-PRIOR> (1,348)
<ACCUMULATED-GAINS-PRIOR> 28,339
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,656
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,226
<AVERAGE-NET-ASSETS> 243,324
<PER-SHARE-NAV-BEGIN> 23.74
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 4.67
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 2.07
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 26.31
<EXPENSE-RATIO> 1.78%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GLOBAL PORTFOLIO FOR
THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 042
<NAME> GLOBAL PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 297,017
<INVESTMENTS-AT-VALUE> 402,147
<RECEIVABLES> 3,516
<ASSETS-OTHER> 1,205
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 406,868
<PAYABLE-FOR-SECURITIES> 442
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,701
<TOTAL-LIABILITIES> 2,143
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 300,412
<SHARES-COMMON-STOCK> 2,809
<SHARES-COMMON-PRIOR> 1,880
<ACCUMULATED-NII-CURRENT> (1,008)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 532
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 104,789
<NET-ASSETS> 404,725
<DIVIDEND-INCOME> 1,902
<INTEREST-INCOME> 332
<OTHER-INCOME> 0
<EXPENSES-NET> 3,226
<NET-INVESTMENT-INCOME> (992)
<REALIZED-GAINS-CURRENT> (180)
<APPREC-INCREASE-CURRENT> 69,032
<NET-CHANGE-FROM-OPS> 67,860
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 4,194
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20,555
<NUMBER-OF-SHARES-REDEEMED> 2,845
<SHARES-REINVESTED> 4,048
<NET-CHANGE-IN-ASSETS> 114,883
<ACCUMULATED-NII-PRIOR> (1,348)
<ACCUMULATED-GAINS-PRIOR> 28,339
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,656
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,226
<AVERAGE-NET-ASSETS> 55,277
<PER-SHARE-NAV-BEGIN> 23.38
<PER-SHARE-NII> (0.10)
<PER-SHARE-GAIN-APPREC> 4.67
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 2.07
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 25.88
<EXPENSE-RATIO> 2.43%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GLOBAL PORTFOLIO FOR
THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 043
<NAME> GLOBAL PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 297,017
<INVESTMENTS-AT-VALUE> 402,147
<RECEIVABLES> 3,516
<ASSETS-OTHER> 1,205
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 406,868
<PAYABLE-FOR-SECURITIES> 442
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,701
<TOTAL-LIABILITIES> 2,143
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 300,412
<SHARES-COMMON-STOCK> 1,932
<SHARES-COMMON-PRIOR> 1,168
<ACCUMULATED-NII-CURRENT> (1,008)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 532
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 104,789
<NET-ASSETS> 404,725
<DIVIDEND-INCOME> 1,902
<INTEREST-INCOME> 332
<OTHER-INCOME> 0
<EXPENSES-NET> 3,226
<NET-INVESTMENT-INCOME> (992)
<REALIZED-GAINS-CURRENT> (180)
<APPREC-INCREASE-CURRENT> 69,032
<NET-CHANGE-FROM-OPS> 67,860
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 2,552
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 18,235
<NUMBER-OF-SHARES-REDEEMED> 3,035
<SHARES-REINVESTED> 2,507
<NET-CHANGE-IN-ASSETS> 114,883
<ACCUMULATED-NII-PRIOR> (1,348)
<ACCUMULATED-GAINS-PRIOR> 28,339
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,656
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,226
<AVERAGE-NET-ASSETS> 36,081
<PER-SHARE-NAV-BEGIN> 23.30
<PER-SHARE-NII> (0.10)
<PER-SHARE-GAIN-APPREC> 4.67
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 2.07
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 25.80
<EXPENSE-RATIO> 2.33%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GROWTH PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 011
<NAME> GROWTH PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 886,564
<INVESTMENTS-AT-VALUE> 1,570,716
<RECEIVABLES> 987
<ASSETS-OTHER> 286
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,571,989
<PAYABLE-FOR-SECURITIES> 493
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,974
<TOTAL-LIABILITIES> 3,467
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 855,029
<SHARES-COMMON-STOCK> 27,456
<SHARES-COMMON-PRIOR> 24,541
<ACCUMULATED-NII-CURRENT> (2,020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32,776
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,737
<NET-ASSETS> 1,568,522
<DIVIDEND-INCOME> 6,023
<INTEREST-INCOME> 1,351
<OTHER-INCOME> 0
<EXPENSES-NET> 9,305
<NET-INVESTMENT-INCOME> (1,931)
<REALIZED-GAINS-CURRENT> 31,636
<APPREC-INCREASE-CURRENT> 337,006
<NET-CHANGE-FROM-OPS> 366,711
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 80,491
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 93,048
<NUMBER-OF-SHARES-REDEEMED> 111,166
<SHARES-REINVESTED> 78,048
<NET-CHANGE-IN-ASSETS> 323,508
<ACCUMULATED-NII-PRIOR> 709
<ACCUMULATED-GAINS-PRIOR> 164,142
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,274
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,305
<AVERAGE-NET-ASSETS> 664,184
<PER-SHARE-NAV-BEGIN> 25.04
<PER-SHARE-NII> (0.07)
<PER-SHARE-GAIN-APPREC> 6.58
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 3.31
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 28.24
<EXPENSE-RATIO> 1.55%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GROWTH PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 012
<NAME> GROWTH PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 886,564
<INVESTMENTS-AT-VALUE> 1,570,716
<RECEIVABLES> 987
<ASSETS-OTHER> 286
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,571,989
<PAYABLE-FOR-SECURITIES> 493
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,974
<TOTAL-LIABILITIES> 3,467
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 855,029
<SHARES-COMMON-STOCK> 781
<SHARES-COMMON-PRIOR> 531
<ACCUMULATED-NII-CURRENT> (2,020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32,776
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,737
<NET-ASSETS> 1,568,522
<DIVIDEND-INCOME> 6,023
<INTEREST-INCOME> 1,351
<OTHER-INCOME> 0
<EXPENSES-NET> 9,305
<NET-INVESTMENT-INCOME> (1,931)
<REALIZED-GAINS-CURRENT> 31,636
<APPREC-INCREASE-CURRENT> 337,006
<NET-CHANGE-FROM-OPS> 366,711
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 1,900
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,205
<NUMBER-OF-SHARES-REDEEMED> 1,226
<SHARES-REINVESTED> 1,872
<NET-CHANGE-IN-ASSETS> 323,508
<ACCUMULATED-NII-PRIOR> 709
<ACCUMULATED-GAINS-PRIOR> 164,142
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,274
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,305
<AVERAGE-NET-ASSETS> 16,285
<PER-SHARE-NAV-BEGIN> 24.55
<PER-SHARE-NII> (0.20)
<PER-SHARE-GAIN-APPREC> 6.58
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 3.31
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 27.62
<EXPENSE-RATIO> 2.20%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GROWTH PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 013
<NAME> GROWTH PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 886,564
<INVESTMENTS-AT-VALUE> 1,570,716
<RECEIVABLES> 987
<ASSETS-OTHER> 286
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,571,989
<PAYABLE-FOR-SECURITIES> 493
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,974
<TOTAL-LIABILITIES> 3,467
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 855,029
<SHARES-COMMON-STOCK> 738
<SHARES-COMMON-PRIOR> 581
<ACCUMULATED-NII-CURRENT> (2,020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32,776
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,737
<NET-ASSETS> 1,568,522
<DIVIDEND-INCOME> 6,023
<INTEREST-INCOME> 1,351
<OTHER-INCOME> 0
<EXPENSES-NET> 9,305
<NET-INVESTMENT-INCOME> (1,931)
<REALIZED-GAINS-CURRENT> 31,636
<APPREC-INCREASE-CURRENT> 337,006
<NET-CHANGE-FROM-OPS> 366,711
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 1,933
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,082
<NUMBER-OF-SHARES-REDEEMED> 2,399
<SHARES-REINVESTED> 1,924
<NET-CHANGE-IN-ASSETS> 323,508
<ACCUMULATED-NII-PRIOR> 709
<ACCUMULATED-GAINS-PRIOR> 164,142
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,274
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,305
<AVERAGE-NET-ASSETS> 16,156
<PER-SHARE-NAV-BEGIN> 24.62
<PER-SHARE-NII> (0.17)
<PER-SHARE-GAIN-APPREC> 6.58
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 3.31
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 27.72
<EXPENSE-RATIO> 2.10%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND GROWTH PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 014
<NAME> GROWTH PORTFOLIO/CLASS T
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 886,564
<INVESTMENTS-AT-VALUE> 1,570,716
<RECEIVABLES> 987
<ASSETS-OTHER> 286
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,571,989
<PAYABLE-FOR-SECURITIES> 493
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,974
<TOTAL-LIABILITIES> 3,467
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 855,029
<SHARES-COMMON-STOCK> 26,288
<SHARES-COMMON-PRIOR> 28,833
<ACCUMULATED-NII-CURRENT> (2,020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32,776
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,737
<NET-ASSETS> 1,568,522
<DIVIDEND-INCOME> 6,023
<INTEREST-INCOME> 1,351
<OTHER-INCOME> 0
<EXPENSES-NET> 9,305
<NET-INVESTMENT-INCOME> (1,931)
<REALIZED-GAINS-CURRENT> 31,636
<APPREC-INCREASE-CURRENT> 337,006
<NET-CHANGE-FROM-OPS> 366,711
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 802
<DISTRIBUTIONS-OF-GAINS> 78,156
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 17,682
<NUMBER-OF-SHARES-REDEEMED> 44,488
<SHARES-REINVESTED> 77,497
<NET-CHANGE-IN-ASSETS> 323,508
<ACCUMULATED-NII-PRIOR> 709
<ACCUMULATED-GAINS-PRIOR> 164,142
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,274
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,305
<AVERAGE-NET-ASSETS> 646,673
<PER-SHARE-NAV-BEGIN> 25.31
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 6.58
<PER-SHARE-DIVIDEND> 0.03
<PER-SHARE-DISTRIBUTIONS> 3.34
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 28.57
<EXPENSE-RATIO> 1.20%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND C.A.S.E. PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 111
<NAME> C.A.S.E. PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 9,619
<INVESTMENTS-AT-VALUE> 9,822
<RECEIVABLES> 571
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 10,393
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8,784
<SHARES-COMMON-STOCK> 397
<SHARES-COMMON-PRIOR> 304
<ACCUMULATED-NII-CURRENT> (47)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,010
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 203
<NET-ASSETS> 9,950
<DIVIDEND-INCOME> 33
<INTEREST-INCOME> 20
<OTHER-INCOME> 0
<EXPENSES-NET> 99
<NET-INVESTMENT-INCOME> (46)
<REALIZED-GAINS-CURRENT> 1,139
<APPREC-INCREASE-CURRENT> (365)
<NET-CHANGE-FROM-OPS> 728
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 340
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,750
<NUMBER-OF-SHARES-REDEEMED> 974
<SHARES-REINVESTED> 339
<NET-CHANGE-IN-ASSETS> 1,566
<ACCUMULATED-NII-PRIOR> (36)
<ACCUMULATED-GAINS-PRIOR> 774
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 47
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 4,747
<PER-SHARE-NAV-BEGIN> 12.90
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 0.91
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.95
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.82
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND C.A.S.E. PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 112
<NAME> C.A.S.E. PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 9,619
<INVESTMENTS-AT-VALUE> 9,822
<RECEIVABLES> 571
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 10,393
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8,784
<SHARES-COMMON-STOCK> 231
<SHARES-COMMON-PRIOR> 190
<ACCUMULATED-NII-CURRENT> (47)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,010
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 203
<NET-ASSETS> 9,950
<DIVIDEND-INCOME> 33
<INTEREST-INCOME> 20
<OTHER-INCOME> 0
<EXPENSES-NET> 99
<NET-INVESTMENT-INCOME> (46)
<REALIZED-GAINS-CURRENT> 1,139
<APPREC-INCREASE-CURRENT> (365)
<NET-CHANGE-FROM-OPS> 728
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 191
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 651
<NUMBER-OF-SHARES-REDEEMED> 349
<SHARES-REINVESTED> 191
<NET-CHANGE-IN-ASSETS> 1,566
<ACCUMULATED-NII-PRIOR> (36)
<ACCUMULATED-GAINS-PRIOR> 774
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 47
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 2,672
<PER-SHARE-NAV-BEGIN> 12.85
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 0.91
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.95
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.72
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND C.A.S.E. PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 113
<NAME> C.A.S.E. PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 9,619
<INVESTMENTS-AT-VALUE> 9,822
<RECEIVABLES> 571
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 10,393
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8,784
<SHARES-COMMON-STOCK> 151
<SHARES-COMMON-PRIOR> 158
<ACCUMULATED-NII-CURRENT> (47)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,010
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 203
<NET-ASSETS> 9,950
<DIVIDEND-INCOME> 33
<INTEREST-INCOME> 20
<OTHER-INCOME> 0
<EXPENSES-NET> 99
<NET-INVESTMENT-INCOME> (46)
<REALIZED-GAINS-CURRENT> 1,139
<APPREC-INCREASE-CURRENT> (365)
<NET-CHANGE-FROM-OPS> 728
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 157
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 410
<NUMBER-OF-SHARES-REDEEMED> 647
<SHARES-REINVESTED> 155
<NET-CHANGE-IN-ASSETS> 1,566
<ACCUMULATED-NII-PRIOR> (36)
<ACCUMULATED-GAINS-PRIOR> 774
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 47
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 125
<AVERAGE-NET-ASSETS> 1,989
<PER-SHARE-NAV-BEGIN> 12.86
<PER-SHARE-NII> (0.08)
<PER-SHARE-GAIN-APPREC> 0.91
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.95
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.74
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND VALUE EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 131
<NAME> VALUE EQUITY PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 13,966
<INVESTMENTS-AT-VALUE> 16,388
<RECEIVABLES> 111
<ASSETS-OTHER> 13
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,512
<PAYABLE-FOR-SECURITIES> 226
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 29
<TOTAL-LIABILITIES> 255
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,738
<SHARES-COMMON-STOCK> 683
<SHARES-COMMON-PRIOR> 453
<ACCUMULATED-NII-CURRENT> (22)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,422
<NET-ASSETS> 16,257
<DIVIDEND-INCOME> 65
<INTEREST-INCOME> 40
<OTHER-INCOME> 0
<EXPENSES-NET> 131
<NET-INVESTMENT-INCOME> (26)
<REALIZED-GAINS-CURRENT> 124
<APPREC-INCREASE-CURRENT> 1,748
<NET-CHANGE-FROM-OPS> 1,846
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 23
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,669
<NUMBER-OF-SHARES-REDEEMED> 915
<SHARES-REINVESTED> 22
<NET-CHANGE-IN-ASSETS> 6,495
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> 36
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 62
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 179
<AVERAGE-NET-ASSETS> 7,071
<PER-SHARE-NAV-BEGIN> 11.71
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 1.68
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.04
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.34
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND VALUE EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 132
<NAME> VALUE EQUITY PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 13,966
<INVESTMENTS-AT-VALUE> 16,388
<RECEIVABLES> 111
<ASSETS-OTHER> 13
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,512
<PAYABLE-FOR-SECURITIES> 226
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 29
<TOTAL-LIABILITIES> 255
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,738
<SHARES-COMMON-STOCK> 341
<SHARES-COMMON-PRIOR> 244
<ACCUMULATED-NII-CURRENT> (22)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,422
<NET-ASSETS> 16,257
<DIVIDEND-INCOME> 65
<INTEREST-INCOME> 40
<OTHER-INCOME> 0
<EXPENSES-NET> 131
<NET-INVESTMENT-INCOME> (26)
<REALIZED-GAINS-CURRENT> 124
<APPREC-INCREASE-CURRENT> 1,748
<NET-CHANGE-FROM-OPS> 1,846
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 11
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,321
<NUMBER-OF-SHARES-REDEEMED> 138
<SHARES-REINVESTED> 11
<NET-CHANGE-IN-ASSETS> 6,495
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> 36
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 62
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 179
<AVERAGE-NET-ASSETS> 3,474
<PER-SHARE-NAV-BEGIN> 11.67
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 1.68
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.04
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.26
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND VALUE EQUITY
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 133
<NAME> VALUE EQUITY PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 13,966
<INVESTMENTS-AT-VALUE> 16,388
<RECEIVABLES> 111
<ASSETS-OTHER> 13
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,512
<PAYABLE-FOR-SECURITIES> 226
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 29
<TOTAL-LIABILITIES> 255
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,738
<SHARES-COMMON-STOCK> 197
<SHARES-COMMON-PRIOR> 138
<ACCUMULATED-NII-CURRENT> (22)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,422
<NET-ASSETS> 16,257
<DIVIDEND-INCOME> 65
<INTEREST-INCOME> 40
<OTHER-INCOME> 0
<EXPENSES-NET> 131
<NET-INVESTMENT-INCOME> (26)
<REALIZED-GAINS-CURRENT> 124
<APPREC-INCREASE-CURRENT> 1,748
<NET-CHANGE-FROM-OPS> 1,846
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 7
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,092
<NUMBER-OF-SHARES-REDEEMED> 379
<SHARES-REINVESTED> 7
<NET-CHANGE-IN-ASSETS> 6,495
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> 36
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 62
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 179
<AVERAGE-NET-ASSETS> 2,043
<PER-SHARE-NAV-BEGIN> 11.67
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 1.68
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.04
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.27
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND STRATEGIC TOTAL
RETURN PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 081
<NAME> STRATEGIC TOTAL RETURN PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 36,019
<INVESTMENTS-AT-VALUE> 43,345
<RECEIVABLES> 365
<ASSETS-OTHER> 41
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43,751
<PAYABLE-FOR-SECURITIES> 159
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 93
<TOTAL-LIABILITIES> 252
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 35,631
<SHARES-COMMON-STOCK> 1,725
<SHARES-COMMON-PRIOR> 1,360
<ACCUMULATED-NII-CURRENT> 77
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 465
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7,326
<NET-ASSETS> 43,499
<DIVIDEND-INCOME> 225
<INTEREST-INCOME> 355
<OTHER-INCOME> 0
<EXPENSES-NET> 369
<NET-INVESTMENT-INCOME> 211
<REALIZED-GAINS-CURRENT> 477
<APPREC-INCREASE-CURRENT> 3,295
<NET-CHANGE-FROM-OPS> 3,983
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 163
<DISTRIBUTIONS-OF-GAINS> 862
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7,159
<NUMBER-OF-SHARES-REDEEMED> 2,236
<SHARES-REINVESTED> 1,015
<NET-CHANGE-IN-ASSETS> 12,840
<ACCUMULATED-NII-PRIOR> 281
<ACCUMULATED-GAINS-PRIOR> 1,228
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 181
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 373
<AVERAGE-NET-ASSETS> 25,156
<PER-SHARE-NAV-BEGIN> 15.91
<PER-SHARE-NII> 0.09
<PER-SHARE-GAIN-APPREC> 1.71
<PER-SHARE-DIVIDEND> 0.11
<PER-SHARE-DISTRIBUTIONS> 0.72
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.99
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND STRATEGIC TOTAL
RETURN PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 082
<NAME> STRATEGIC TOTAL RETURN PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 36,019
<INVESTMENTS-AT-VALUE> 43,345
<RECEIVABLES> 365
<ASSETS-OTHER> 41
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43,751
<PAYABLE-FOR-SECURITIES> 159
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 93
<TOTAL-LIABILITIES> 252
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 35,631
<SHARES-COMMON-STOCK> 443
<SHARES-COMMON-PRIOR> 296
<ACCUMULATED-NII-CURRENT> 77
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 465
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7,326
<NET-ASSETS> 43,499
<DIVIDEND-INCOME> 225
<INTEREST-INCOME> 355
<OTHER-INCOME> 0
<EXPENSES-NET> 369
<NET-INVESTMENT-INCOME> 211
<REALIZED-GAINS-CURRENT> 477
<APPREC-INCREASE-CURRENT> 3,295
<NET-CHANGE-FROM-OPS> 3,983
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 21
<DISTRIBUTIONS-OF-GAINS> 198
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,596
<NUMBER-OF-SHARES-REDEEMED> 407
<SHARES-REINVESTED> 214
<NET-CHANGE-IN-ASSETS> 12,840
<ACCUMULATED-NII-PRIOR> 281
<ACCUMULATED-GAINS-PRIOR> 1,228
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 181
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 373
<AVERAGE-NET-ASSETS> 6,082
<PER-SHARE-NAV-BEGIN> 15.89
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 1.71
<PER-SHARE-DIVIDEND> 0.06
<PER-SHARE-DISTRIBUTIONS> 0.67
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.98
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND STRATEGIC TOTAL
RETURN PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 083
<NAME> STRATEGIC TOTAL RETURN PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 36,019
<INVESTMENTS-AT-VALUE> 43,345
<RECEIVABLES> 365
<ASSETS-OTHER> 41
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43,751
<PAYABLE-FOR-SECURITIES> 159
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 93
<TOTAL-LIABILITIES> 252
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 35,631
<SHARES-COMMON-STOCK> 392
<SHARES-COMMON-PRIOR> 273
<ACCUMULATED-NII-CURRENT> 77
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 465
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7,326
<NET-ASSETS> 43,499
<DIVIDEND-INCOME> 225
<INTEREST-INCOME> 355
<OTHER-INCOME> 0
<EXPENSES-NET> 369
<NET-INVESTMENT-INCOME> 211
<REALIZED-GAINS-CURRENT> 477
<APPREC-INCREASE-CURRENT> 3,295
<NET-CHANGE-FROM-OPS> 3,983
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 20
<DISTRIBUTIONS-OF-GAINS> 176
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,636
<NUMBER-OF-SHARES-REDEEMED> 875
<SHARES-REINVESTED> 195
<NET-CHANGE-IN-ASSETS> 12,840
<ACCUMULATED-NII-PRIOR> 281
<ACCUMULATED-GAINS-PRIOR> 1,228
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 181
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 373
<AVERAGE-NET-ASSETS> 5,339
<PER-SHARE-NAV-BEGIN> 15.90
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 1.71
<PER-SHARE-DIVIDEND> 0.07
<PER-SHARE-DISTRIBUTIONS> 0.68
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.98
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TACTICAL ASSET
ALLOCATION PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 101
<NAME> TACTICAL ASSET ALLOCATION PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 30,935
<INVESTMENTS-AT-VALUE> 34,853
<RECEIVABLES> 350
<ASSETS-OTHER> 32
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 35,235
<PAYABLE-FOR-SECURITIES> 209
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99
<TOTAL-LIABILITIES> 308
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 29,600
<SHARES-COMMON-STOCK> 1,103
<SHARES-COMMON-PRIOR> 932
<ACCUMULATED-NII-CURRENT> 106
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,303
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,918
<NET-ASSETS> 34,927
<DIVIDEND-INCOME> 153
<INTEREST-INCOME> 404
<OTHER-INCOME> 0
<EXPENSES-NET> 333
<NET-INVESTMENT-INCOME> 224
<REALIZED-GAINS-CURRENT> 1,303
<APPREC-INCREASE-CURRENT> 1,321
<NET-CHANGE-FROM-OPS> 2,848
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 100
<DISTRIBUTIONS-OF-GAINS> 688
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,175
<NUMBER-OF-SHARES-REDEEMED> 1,723
<SHARES-REINVESTED> 774
<NET-CHANGE-IN-ASSETS> 7,801
<ACCUMULATED-NII-PRIOR> 275
<ACCUMULATED-GAINS-PRIOR> 1,555
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 151
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 337
<AVERAGE-NET-ASSETS> 13,343
<PER-SHARE-NAV-BEGIN> 13.19
<PER-SHARE-NII> 0.11
<PER-SHARE-GAIN-APPREC> 1.12
<PER-SHARE-DIVIDEND> 0.10
<PER-SHARE-DISTRIBUTIONS> 0.83
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.59
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TACTICAL ASSET
ALLOCATION PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 102
<NAME> TACTICAL ASSET ALLOCATION PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 30,935
<INVESTMENTS-AT-VALUE> 34,853
<RECEIVABLES> 350
<ASSETS-OTHER> 32
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 35,235
<PAYABLE-FOR-SECURITIES> 209
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99
<TOTAL-LIABILITIES> 308
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 29,600
<SHARES-COMMON-STOCK> 950
<SHARES-COMMON-PRIOR> 740
<ACCUMULATED-NII-CURRENT> 106
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,303
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,918
<NET-ASSETS> 34,927
<DIVIDEND-INCOME> 153
<INTEREST-INCOME> 404
<OTHER-INCOME> 0
<EXPENSES-NET> 333
<NET-INVESTMENT-INCOME> 224
<REALIZED-GAINS-CURRENT> 1,303
<APPREC-INCREASE-CURRENT> 1,321
<NET-CHANGE-FROM-OPS> 2,848
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 50
<DISTRIBUTIONS-OF-GAINS> 562
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,555
<NUMBER-OF-SHARES-REDEEMED> 1,422
<SHARES-REINVESTED> 607
<NET-CHANGE-IN-ASSETS> 7,801
<ACCUMULATED-NII-PRIOR> 275
<ACCUMULATED-GAINS-PRIOR> 1,555
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 151
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 337
<AVERAGE-NET-ASSETS> 11,215
<PER-SHARE-NAV-BEGIN> 13.18
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> 1.12
<PER-SHARE-DIVIDEND> 0.06
<PER-SHARE-DISTRIBUTIONS> 0.79
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.58
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TACTICAL ASSET
ALLOCATION PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 103
<NAME> TACTICAL ASSET ALLOCATION PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 30,935
<INVESTMENTS-AT-VALUE> 34,853
<RECEIVABLES> 350
<ASSETS-OTHER> 32
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 35,235
<PAYABLE-FOR-SECURITIES> 209
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99
<TOTAL-LIABILITIES> 308
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 29,600
<SHARES-COMMON-STOCK> 519
<SHARES-COMMON-PRIOR> 386
<ACCUMULATED-NII-CURRENT> 106
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,303
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,918
<NET-ASSETS> 34,927
<DIVIDEND-INCOME> 153
<INTEREST-INCOME> 404
<OTHER-INCOME> 0
<EXPENSES-NET> 333
<NET-INVESTMENT-INCOME> 224
<REALIZED-GAINS-CURRENT> 1,303
<APPREC-INCREASE-CURRENT> 1,321
<NET-CHANGE-FROM-OPS> 2,848
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 30
<DISTRIBUTIONS-OF-GAINS> 302
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,564
<NUMBER-OF-SHARES-REDEEMED> 1,176
<SHARES-REINVESTED> 331
<NET-CHANGE-IN-ASSETS> 7,801
<ACCUMULATED-NII-PRIOR> 275
<ACCUMULATED-GAINS-PRIOR> 1,555
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 151
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 337
<AVERAGE-NET-ASSETS> 6,032
<PER-SHARE-NAV-BEGIN> 13.18
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 1.12
<PER-SHARE-DIVIDEND> 0.07
<PER-SHARE-DISTRIBUTIONS> 0.80
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.58
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND BALANCED PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 091
<NAME> BALANCED PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 21,835
<INVESTMENTS-AT-VALUE> 25,465
<RECEIVABLES> 373
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,842
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 114
<TOTAL-LIABILITIES> 114
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,704
<SHARES-COMMON-STOCK> 1,271
<SHARES-COMMON-PRIOR> 935
<ACCUMULATED-NII-CURRENT> 32
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 361
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,631
<NET-ASSETS> 25,728
<DIVIDEND-INCOME> 67
<INTEREST-INCOME> 240
<OTHER-INCOME> 0
<EXPENSES-NET> 202
<NET-INVESTMENT-INCOME> 105
<REALIZED-GAINS-CURRENT> 344
<APPREC-INCREASE-CURRENT> 2,127
<NET-CHANGE-FROM-OPS> 2,576
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 83
<DISTRIBUTIONS-OF-GAINS> 1,281
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,371
<NUMBER-OF-SHARES-REDEEMED> 1,156
<SHARES-REINVESTED> 1,359
<NET-CHANGE-IN-ASSETS> 8,170
<ACCUMULATED-NII-PRIOR> 155
<ACCUMULATED-GAINS-PRIOR> 1,751
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 238
<AVERAGE-NET-ASSETS> 15,156
<PER-SHARE-NAV-BEGIN> 14.34
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 1.60
<PER-SHARE-DIVIDEND> 0.08
<PER-SHARE-DISTRIBUTIONS> 1.43
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.59
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND BALANCED PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 092
<NAME> BALANCED PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 21,835
<INVESTMENTS-AT-VALUE> 25,465
<RECEIVABLES> 373
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,842
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 114
<TOTAL-LIABILITIES> 114
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,704
<SHARES-COMMON-STOCK> 306
<SHARES-COMMON-PRIOR> 180
<ACCUMULATED-NII-CURRENT> 32
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 361
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,631
<NET-ASSETS> 25,728
<DIVIDEND-INCOME> 67
<INTEREST-INCOME> 240
<OTHER-INCOME> 0
<EXPENSES-NET> 202
<NET-INVESTMENT-INCOME> 105
<REALIZED-GAINS-CURRENT> 344
<APPREC-INCREASE-CURRENT> 2,127
<NET-CHANGE-FROM-OPS> 2,576
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 8
<DISTRIBUTIONS-OF-GAINS> 260
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,635
<NUMBER-OF-SHARES-REDEEMED> 171
<SHARES-REINVESTED> 262
<NET-CHANGE-IN-ASSETS> 8,170
<ACCUMULATED-NII-PRIOR> 155
<ACCUMULATED-GAINS-PRIOR> 1,751
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 238
<AVERAGE-NET-ASSETS> 3,312
<PER-SHARE-NAV-BEGIN> 14.33
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 1.60
<PER-SHARE-DIVIDEND> 0.04
<PER-SHARE-DISTRIBUTIONS> 1.39
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.58
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND BALANCED PORTFOLIO
FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 093
<NAME> BALANCED PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 21,835
<INVESTMENTS-AT-VALUE> 25,465
<RECEIVABLES> 373
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,842
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 114
<TOTAL-LIABILITIES> 114
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21,704
<SHARES-COMMON-STOCK> 187
<SHARES-COMMON-PRIOR> 109
<ACCUMULATED-NII-CURRENT> 32
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 361
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,631
<NET-ASSETS> 25,728
<DIVIDEND-INCOME> 67
<INTEREST-INCOME> 240
<OTHER-INCOME> 0
<EXPENSES-NET> 202
<NET-INVESTMENT-INCOME> 105
<REALIZED-GAINS-CURRENT> 344
<APPREC-INCREASE-CURRENT> 2,127
<NET-CHANGE-FROM-OPS> 2,576
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 5
<DISTRIBUTIONS-OF-GAINS> 157
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,449
<NUMBER-OF-SHARES-REDEEMED> 520
<SHARES-REINVESTED> 159
<NET-CHANGE-IN-ASSETS> 8,170
<ACCUMULATED-NII-PRIOR> 155
<ACCUMULATED-GAINS-PRIOR> 1,751
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 238
<AVERAGE-NET-ASSETS> 1,893
<PER-SHARE-NAV-BEGIN> 14.33
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 1.60
<PER-SHARE-DIVIDEND> 0.04
<PER-SHARE-DISTRIBUTIONS> 1.39
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.58
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND FLEXIBLE INCOME
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 051
<NAME> FLEXIBLE INCOME PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 15,117
<INVESTMENTS-AT-VALUE> 15,902
<RECEIVABLES> 469
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,375
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 125
<TOTAL-LIABILITIES> 125
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,841
<SHARES-COMMON-STOCK> 1,444
<SHARES-COMMON-PRIOR> 1,593
<ACCUMULATED-NII-CURRENT> 40
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (417)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 786
<NET-ASSETS> 16,250
<DIVIDEND-INCOME> 6
<INTEREST-INCOME> 687
<OTHER-INCOME> 0
<EXPENSES-NET> 160
<NET-INVESTMENT-INCOME> 533
<REALIZED-GAINS-CURRENT> 272
<APPREC-INCREASE-CURRENT> (19)
<NET-CHANGE-FROM-OPS> 786
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 489
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 585
<NUMBER-OF-SHARES-REDEEMED> 2,427
<SHARES-REINVESTED> 378
<NET-CHANGE-IN-ASSETS> (956)
<ACCUMULATED-NII-PRIOR> 1,102
<ACCUMULATED-GAINS-PRIOR> 328
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 75
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 169
<AVERAGE-NET-ASSETS> 14,891
<PER-SHARE-NAV-BEGIN> 9.75
<PER-SHARE-NII> 0.26
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.27
<PER-SHARE-DISTRIBUTIONS> 0.27
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.89
<EXPENSE-RATIO> 1.85%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND FLEXIBLE INCOME
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 052
<NAME> FLEXIBLE INCOME PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 15,117
<INVESTMENTS-AT-VALUE> 15,902
<RECEIVABLES> 469
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,375
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 125
<TOTAL-LIABILITIES> 125
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,841
<SHARES-COMMON-STOCK> 92
<SHARES-COMMON-PRIOR> 77
<ACCUMULATED-NII-CURRENT> 40
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (417)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 786
<NET-ASSETS> 16,250
<DIVIDEND-INCOME> 6
<INTEREST-INCOME> 687
<OTHER-INCOME> 0
<EXPENSES-NET> 160
<NET-INVESTMENT-INCOME> 533
<REALIZED-GAINS-CURRENT> 272
<APPREC-INCREASE-CURRENT> (19)
<NET-CHANGE-FROM-OPS> 786
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 24
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 196
<NUMBER-OF-SHARES-REDEEMED> 62
<SHARES-REINVESTED> 20
<NET-CHANGE-IN-ASSETS> (956)
<ACCUMULATED-NII-PRIOR> 1,102
<ACCUMULATED-GAINS-PRIOR> 328
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 75
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 169
<AVERAGE-NET-ASSETS> 809
<PER-SHARE-NAV-BEGIN> 9.75
<PER-SHARE-NII> 0.23
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.24
<PER-SHARE-DISTRIBUTIONS> 0.24
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.89
<EXPENSE-RATIO> 2.50%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND FLEXIBLE INCOME
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 053
<NAME> FLEXIBLE INCOME PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 15,117
<INVESTMENTS-AT-VALUE> 15,902
<RECEIVABLES> 469
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,375
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 125
<TOTAL-LIABILITIES> 125
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,841
<SHARES-COMMON-STOCK> 107
<SHARES-COMMON-PRIOR> 95
<ACCUMULATED-NII-CURRENT> 40
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (417)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 786
<NET-ASSETS> 16,250
<DIVIDEND-INCOME> 6
<INTEREST-INCOME> 687
<OTHER-INCOME> 0
<EXPENSES-NET> 160
<NET-INVESTMENT-INCOME> 533
<REALIZED-GAINS-CURRENT> 272
<APPREC-INCREASE-CURRENT> (19)
<NET-CHANGE-FROM-OPS> 786
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 34
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 549
<NUMBER-OF-SHARES-REDEEMED> 467
<SHARES-REINVESTED> 33
<NET-CHANGE-IN-ASSETS> (956)
<ACCUMULATED-NII-PRIOR> 1,102
<ACCUMULATED-GAINS-PRIOR> 328
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 75
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 169
<AVERAGE-NET-ASSETS> 1,101
<PER-SHARE-NAV-BEGIN> 9.75
<PER-SHARE-NII> 0.24
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.25
<PER-SHARE-DISTRIBUTIONS> 0.25
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.89
<EXPENSE-RATIO> 2.40%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INCOME PLUS
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 031
<NAME> INCOME PLUS PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 70,913
<INVESTMENTS-AT-VALUE> 73,384
<RECEIVABLES> 1,373
<ASSETS-OTHER> 5
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 74,762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,577
<TOTAL-LIABILITIES> 2,577
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 68,588
<SHARES-COMMON-STOCK> 6,050
<SHARES-COMMON-PRIOR> 5,986
<ACCUMULATED-NII-CURRENT> 232
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 894
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,471
<NET-ASSETS> 72,185
<DIVIDEND-INCOME> 199
<INTEREST-INCOME> 2,576
<OTHER-INCOME> 0
<EXPENSES-NET> 469
<NET-INVESTMENT-INCOME> 2,306
<REALIZED-GAINS-CURRENT> 893
<APPREC-INCREASE-CURRENT> (921)
<NET-CHANGE-FROM-OPS> 2,278
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2,192
<DISTRIBUTIONS-OF-GAINS> 1,318
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 13,586
<NUMBER-OF-SHARES-REDEEMED> 15,605
<SHARES-REINVESTED> 2,722
<NET-CHANGE-IN-ASSETS> 1,332
<ACCUMULATED-NII-PRIOR> 4,938
<ACCUMULATED-GAINS-PRIOR> 1,592
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 216
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 469
<AVERAGE-NET-ASSETS> 66,232
<PER-SHARE-NAV-BEGIN> 10.96
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> 0.29
<PER-SHARE-DISTRIBUTIONS> 0.51
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.73
<EXPENSE-RATIO> 1.25%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INCOME PLUS
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 032
<NAME> INCOME PLUS PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 70,913
<INVESTMENTS-AT-VALUE> 73,384
<RECEIVABLES> 1,373
<ASSETS-OTHER> 5
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 74,762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,577
<TOTAL-LIABILITIES> 2,577
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 68,588
<SHARES-COMMON-STOCK> 267
<SHARES-COMMON-PRIOR> 161
<ACCUMULATED-NII-CURRENT> 232
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 894
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,471
<NET-ASSETS> 72,185
<DIVIDEND-INCOME> 199
<INTEREST-INCOME> 2,576
<OTHER-INCOME> 0
<EXPENSES-NET> 469
<NET-INVESTMENT-INCOME> 2,306
<REALIZED-GAINS-CURRENT> 893
<APPREC-INCREASE-CURRENT> (921)
<NET-CHANGE-FROM-OPS> 2,278
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 67
<DISTRIBUTIONS-OF-GAINS> 38
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,140
<NUMBER-OF-SHARES-REDEEMED> 74
<SHARES-REINVESTED> 78
<NET-CHANGE-IN-ASSETS> 1,332
<ACCUMULATED-NII-PRIOR> 4,938
<ACCUMULATED-GAINS-PRIOR> 1,592
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 216
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 469
<AVERAGE-NET-ASSETS> 2,280
<PER-SHARE-NAV-BEGIN> 10.96
<PER-SHARE-NII> 0.23
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> 0.26
<PER-SHARE-DISTRIBUTIONS> 0.48
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.72
<EXPENSE-RATIO> 1.90%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND INCOME PLUS
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 033
<NAME> INCOME PLUS PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 70,913
<INVESTMENTS-AT-VALUE> 73,384
<RECEIVABLES> 1,373
<ASSETS-OTHER> 5
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 74,762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,577
<TOTAL-LIABILITIES> 2,577
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 68,588
<SHARES-COMMON-STOCK> 412
<SHARES-COMMON-PRIOR> 318
<ACCUMULATED-NII-CURRENT> 232
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 894
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,471
<NET-ASSETS> 72,185
<DIVIDEND-INCOME> 199
<INTEREST-INCOME> 2,576
<OTHER-INCOME> 0
<EXPENSES-NET> 469
<NET-INVESTMENT-INCOME> 2,306
<REALIZED-GAINS-CURRENT> 893
<APPREC-INCREASE-CURRENT> (921)
<NET-CHANGE-FROM-OPS> 2,278
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 123
<DISTRIBUTIONS-OF-GAINS> 77
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,787
<NUMBER-OF-SHARES-REDEEMED> 948
<SHARES-REINVESTED> 183
<NET-CHANGE-IN-ASSETS> 1,332
<ACCUMULATED-NII-PRIOR> 4,938
<ACCUMULATED-GAINS-PRIOR> 1,592
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 216
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 469
<AVERAGE-NET-ASSETS> 4,067
<PER-SHARE-NAV-BEGIN> 10.96
<PER-SHARE-NII> 0.25
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> 0.27
<PER-SHARE-DISTRIBUTIONS> 0.49
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.73
<EXPENSE-RATIO> 1.80%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TAX-EXEMPT
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 021
<NAME> TAX-EXEMPT PORTFOLIO/CLASS A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLAR
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,704
<INVESTMENTS-AT-VALUE> 24,407
<RECEIVABLES> 411
<ASSETS-OTHER> 250
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,068
<PAYABLE-FOR-SECURITIES> 967
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 86
<TOTAL-LIABILITIES> 1,053
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 22,950
<SHARES-COMMON-STOCK> 1,951
<SHARES-COMMON-PRIOR> 1,985
<ACCUMULATED-NII-CURRENT> 50
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 311
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 704
<NET-ASSETS> 24,015
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 662
<OTHER-INCOME> 0
<EXPENSES-NET> 139
<NET-INVESTMENT-INCOME> 523
<REALIZED-GAINS-CURRENT> 350
<APPREC-INCREASE-CURRENT> (232)
<NET-CHANGE-FROM-OPS> 641
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 488
<DISTRIBUTIONS-OF-GAINS> 305
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,499
<NUMBER-OF-SHARES-REDEEMED> 5,433
<SHARES-REINVESTED> 541
<NET-CHANGE-IN-ASSETS> (603)
<ACCUMULATED-NII-PRIOR> 1,130
<ACCUMULATED-GAINS-PRIOR> 286
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 74
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 167
<AVERAGE-NET-ASSETS> 23,461
<PER-SHARE-NAV-BEGIN> 11.75
<PER-SHARE-NII> 0.20
<PER-SHARE-GAIN-APPREC> 0.05
<PER-SHARE-DIVIDEND> 0.20
<PER-SHARE-DISTRIBUTIONS> 0.35
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.65
<EXPENSE-RATIO> 1.12%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TAX-EXEMPT
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 022
<NAME> TAX-EXEMPT PORTFOLIO/CLASS B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLAR
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,704
<INVESTMENTS-AT-VALUE> 24,407
<RECEIVABLES> 411
<ASSETS-OTHER> 250
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,068
<PAYABLE-FOR-SECURITIES> 967
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 86
<TOTAL-LIABILITIES> 1,053
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 22,950
<SHARES-COMMON-STOCK> 34
<SHARES-COMMON-PRIOR> 32
<ACCUMULATED-NII-CURRENT> 50
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 311
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 704
<NET-ASSETS> 24,015
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 662
<OTHER-INCOME> 0
<EXPENSES-NET> 139
<NET-INVESTMENT-INCOME> 523
<REALIZED-GAINS-CURRENT> 350
<APPREC-INCREASE-CURRENT> (232)
<NET-CHANGE-FROM-OPS> 641
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 7
<DISTRIBUTIONS-OF-GAINS> 5
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 74
<NUMBER-OF-SHARES-REDEEMED> 57
<SHARES-REINVESTED> 8
<NET-CHANGE-IN-ASSETS> (603)
<ACCUMULATED-NII-PRIOR> 1,130
<ACCUMULATED-GAINS-PRIOR> 286
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 74
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 167
<AVERAGE-NET-ASSETS> 380
<PER-SHARE-NAV-BEGIN> 11.74
<PER-SHARE-NII> 0.18
<PER-SHARE-GAIN-APPREC> 0.05
<PER-SHARE-DIVIDEND> 0.17
<PER-SHARE-DISTRIBUTIONS> 0.32
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.65
<EXPENSE-RATIO> 1.77%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF IDEX SERIES FUND TAX-EXEMPT
PORTFOLIO FOR THE PERIOD ENDED APRIL 30, 1998, AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000787623
<NAME> IDEX SERIES FUND
<SERIES>
<NUMBER> 023
<NAME> TAX-EXEMPT PORTFOLIO/CLASS C
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLAR
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1998
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 23,704
<INVESTMENTS-AT-VALUE> 24,407
<RECEIVABLES> 411
<ASSETS-OTHER> 250
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,068
<PAYABLE-FOR-SECURITIES> 967
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 86
<TOTAL-LIABILITIES> 1,053
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 22,950
<SHARES-COMMON-STOCK> 75
<SHARES-COMMON-PRIOR> 78
<ACCUMULATED-NII-CURRENT> 50
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 311
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 704
<NET-ASSETS> 24,015
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 662
<OTHER-INCOME> 0
<EXPENSES-NET> 139
<NET-INVESTMENT-INCOME> 523
<REALIZED-GAINS-CURRENT> 350
<APPREC-INCREASE-CURRENT> (232)
<NET-CHANGE-FROM-OPS> 641
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 18
<DISTRIBUTIONS-OF-GAINS> 12
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 124
<NUMBER-OF-SHARES-REDEEMED> 392
<SHARES-REINVESTED> 227
<NET-CHANGE-IN-ASSETS> (603)
<ACCUMULATED-NII-PRIOR> 1,130
<ACCUMULATED-GAINS-PRIOR> 286
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 74
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 167
<AVERAGE-NET-ASSETS> 908
<PER-SHARE-NAV-BEGIN> 11.75
<PER-SHARE-NII> 0.19
<PER-SHARE-GAIN-APPREC> 0.05
<PER-SHARE-DIVIDEND> 0.19
<PER-SHARE-DISTRIBUTIONS> 0.34
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.65
<EXPENSE-RATIO> 1.37%
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<PAGE>
</TABLE>
