<PAGE> PAGE 1
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<PAGE> PAGE 2
007 C013000 30
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<PAGE> PAGE 3
020 C000004 55
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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SIGNATURE THOMAS G. ROSE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 001
<NAME> SELIGMAN FRONTIER FUND, INC.-CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 555566
<INVESTMENTS-AT-VALUE> 520680
<RECEIVABLES> 8046
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 528806
<PAYABLE-FOR-SECURITIES> 4466
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 14510
<TOTAL-LIABILITIES> 18976
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 543930
<SHARES-COMMON-STOCK> 22841<F1>
<SHARES-COMMON-PRIOR> 30549<F1>
<ACCUMULATED-NII-CURRENT> (4994)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5780
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (34886)
<NET-ASSETS> 274680<F1>
<DIVIDEND-INCOME> 514<F1>
<INTEREST-INCOME> 410<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (2944)<F1>
<NET-INVESTMENT-INCOME> (2020)<F1>
<REALIZED-GAINS-CURRENT> 6463
<APPREC-INCREASE-CURRENT> (11741)
<NET-CHANGE-FROM-OPS> (10223)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 21101<F1>
<NUMBER-OF-SHARES-REDEEMED> (28809)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (201214)
<ACCUMULATED-NII-PRIOR> (49)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> (683)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1794<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2944<F1>
<AVERAGE-NET-ASSETS> 379303<F1>
<PER-SHARE-NAV-BEGIN> 12.44<F1>
<PER-SHARE-NII> (0.07)<F1>
<PER-SHARE-GAIN-APPREC> (0.34)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.03<F1>
<EXPENSE-RATIO> 1.56<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 002
<NAME> SELIGMAN FRONTIER FUND, INC.-CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 555566
<INVESTMENTS-AT-VALUE> 520680
<RECEIVABLES> 8046
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 528806
<PAYABLE-FOR-SECURITIES> 4466
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 14510
<TOTAL-LIABILITIES> 18976
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 543930
<SHARES-COMMON-STOCK> 4971<F1>
<SHARES-COMMON-PRIOR> 5762<F1>
<ACCUMULATED-NII-CURRENT> (4994)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5780
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (34886)
<NET-ASSETS> 55851<F1>
<DIVIDEND-INCOME> 95<F1>
<INTEREST-INCOME> 77<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (814)<F1>
<NET-INVESTMENT-INCOME> (642)<F1>
<REALIZED-GAINS-CURRENT> 6463
<APPREC-INCREASE-CURRENT> (11741)
<NET-CHANGE-FROM-OPS> (10223)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1726<F1>
<NUMBER-OF-SHARES-REDEEMED> (2517)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (201214)
<ACCUMULATED-NII-PRIOR> (49)
<ACCUMULATED-GAINS-PRIOR> (683)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 333<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 814<F1>
<AVERAGE-NET-ASSETS> 70412<F1>
<PER-SHARE-NAV-BEGIN> 11.66<F1>
<PER-SHARE-NII> (0.11)<F1>
<PER-SHARE-GAIN-APPREC> (0.31)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.24<F1>
<EXPENSE-RATIO> 2.32<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class B only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 004
<NAME> SELIGMAN FRONTIER FUND, INC.-CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 555566
<INVESTMENTS-AT-VALUE> 520680
<RECEIVABLES> 8046
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 528806
<PAYABLE-FOR-SECURITIES> 4466
<SENIOR-LONG-TERM-DEBT> 0
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<TOTAL-LIABILITIES> 18976
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 543930
<SHARES-COMMON-STOCK> 15950<F1>
<SHARES-COMMON-PRIOR> 22618<F1>
<ACCUMULATED-NII-CURRENT> (4994)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5780
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (34886)
<NET-ASSETS> 179299<F1>
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<INTEREST-INCOME> 275<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (2898)<F1>
<NET-INVESTMENT-INCOME> (2283)<F1>
<REALIZED-GAINS-CURRENT> 6463
<APPREC-INCREASE-CURRENT> (11741)
<NET-CHANGE-FROM-OPS> (10223)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 21489<F1>
<NUMBER-OF-SHARES-REDEEMED> (28157)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (201214)
<ACCUMULATED-NII-PRIOR> (49)
<ACCUMULATED-GAINS-PRIOR> (683)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1187<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2898<F1>
<AVERAGE-NET-ASSETS> 251071<F1>
<PER-SHARE-NAV-BEGIN> 11.67<F1>
<PER-SHARE-NII> (0.11)<F1>
<PER-SHARE-GAIN-APPREC> (0.32)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.24<F1>
<EXPENSE-RATIO> 2.32<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
