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<PAGE> PAGE 10
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
SIGNATURE STEVE LEMIRE
TITLE SECRETARY
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND> This schedule contains summary financial information extracted from
June 30, 1997 Semi-Annual Report and is qualified in its entirety by reference
to such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 01
<NAME> Oberweis Emerging Growth Portfolio
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<TABLE> <S> <C>
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</LEGEND>
<SERIES>
<NUMBER> 02
<NAME> Oberweis Micro-Cap Portfolio
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<REALIZED-GAINS-CURRENT> (2,515)
<APPREC-INCREASE-CURRENT> 4,072
<NET-CHANGE-FROM-OPS> 1,289
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,048
<NUMBER-OF-SHARES-REDEEMED> (1,044)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 1,645
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 100
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 307
<AVERAGE-NET-ASSETS> 32,378
<PER-SHARE-NAV-BEGIN> 12.28
<PER-SHARE-NII> (.10)
<PER-SHARE-GAIN-APPREC> .74
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.92
<EXPENSE-RATIO> 1.83
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND> This schedule contains summary financial information extracted from
June 30, 1997 Semi-Annual Report and is qualified in its entirety by reference
to such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 03
<NAME> Oberweis Mid-Cap Portfolio
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-START> JAN-01-1997
<PERIOD-END> JUN-30-1997
<INVESTMENTS-AT-COST> 5,303
<INVESTMENTS-AT-VALUE> 6,441
<RECEIVABLES> 165
<ASSETS-OTHER> 52
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 6,658
<PAYABLE-FOR-SECURITIES> 65
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 257
<TOTAL-LIABILITIES> 322
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 6,048
<SHARES-COMMON-STOCK> 608
<SHARES-COMMON-PRIOR> 709
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (870)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,158
<NET-ASSETS> 6,336
<DIVIDEND-INCOME> 6
<INTEREST-INCOME> 3
<OTHER-INCOME> 0
<EXPENSES-NET> (64)
<NET-INVESTMENT-INCOME> (74)
<REALIZED-GAINS-CURRENT> (807)
<APPREC-INCREASE-CURRENT> 923
<NET-CHANGE-FROM-OPS> 61
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 176
<NUMBER-OF-SHARES-REDEEMED> (278)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (959)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 13
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 83
<AVERAGE-NET-ASSETS> 6,386
<PER-SHARE-NAV-BEGIN> 10.29
<PER-SHARE-NII> (.08)
<PER-SHARE-GAIN-APPREC> .21
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.42
<EXPENSE-RATIO> 2.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>