<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000874775
<NAME> IAI INVESTMENT FUNDS VI, INC.
<SERIES>
<NUMBER> 3
<NAME> IAI Midcap Growth Fund
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 31,812,069
<INVESTMENTS-AT-VALUE> 45,070,071
<RECEIVABLES> 346,065
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 45,416,136
<PAYABLE-FOR-SECURITIES> 2,593,551
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 255,082
<TOTAL-LIABILITIES> 2,848,633
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 23,647,189
<SHARES-COMMON-STOCK> 2,370,526
<SHARES-COMMON-PRIOR> 2,753,963
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,662,312
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13,258,002
<NET-ASSETS> 42,567,503
<DIVIDEND-INCOME> 118,325
<INTEREST-INCOME> 80,720
<OTHER-INCOME> 0
<EXPENSES-NET> (475,037)
<NET-INVESTMENT-INCOME> (275,992)
<REALIZED-GAINS-CURRENT> 8,344,844
<APPREC-INCREASE-CURRENT> 7,245,201
<NET-CHANGE-FROM-OPS> 15,314,053
<EQUALIZATION> 2,215,081
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (6,388,488)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 835,153
<NUMBER-OF-SHARES-REDEEMED> (1,671,177)
<SHARES-REINVESTED> 452,587
<NET-CHANGE-IN-ASSETS> 3,136,263
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 6,195,265
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (473,807)
<INTEREST-EXPENSE> (1,230)
<GROSS-EXPENSE> (490,356)
<AVERAGE-NET-ASSETS> 37,797,600
<PER-SHARE-NAV-BEGIN> 14.32
<PER-SHARE-NII> (0.11)
<PER-SHARE-GAIN-APPREC> 6.30
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (2.55)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 17.96
<EXPENSE-RATIO> 1.25
</TABLE>
