<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the AIM Mid Cap
Opportunities Class B Fund July 31, 2000 annual report.
</LEGEND>
<SERIES>
<NUMBER> 5
<NAME> AIM MID CAP OPPORTUNITIES CLASS B FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JUL-31-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 645,657,197
<INVESTMENTS-AT-VALUE> 682,993,411
<RECEIVABLES> 147,563,451
<ASSETS-OTHER> 15,616
<OTHER-ITEMS-ASSETS> 3,358,811
<TOTAL-ASSETS> 833,931,289
<PAYABLE-FOR-SECURITIES> 7,701,274
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 134,135,858
<TOTAL-LIABILITIES> 141,837,132
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 687,714,752
<SHARES-COMMON-STOCK> 29,373,881
<SHARES-COMMON-PRIOR> 303,481
<ACCUMULATED-NII-CURRENT> (31,466)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (36,753,879)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 41,164,750
<NET-ASSETS> 692,094,157
<DIVIDEND-INCOME> 1,989,282
<INTEREST-INCOME> 527,559
<OTHER-INCOME> 2,762,008
<EXPENSES-NET> (9,397,729)
<NET-INVESTMENT-INCOME> (4,118,880)
<REALIZED-GAINS-CURRENT> (36,506,999)
<APPREC-INCREASE-CURRENT> 40,346,572
<NET-CHANGE-FROM-OPS> (279,307)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 78,874
<DISTRIBUTIONS-OF-GAINS> 698,067
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 32,144,125
<NUMBER-OF-SHARES-REDEEMED> (3,114,693)
<SHARES-REINVESTED> 40,968
<NET-CHANGE-IN-ASSETS> 687,304,282
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 442,169
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,153,525
<INTEREST-EXPENSE> 576,971
<GROSS-EXPENSE> 9,548,105
<AVERAGE-NET-ASSETS> 179,224,846
<PER-SHARE-NAV-BEGIN> 17.83
<PER-SHARE-NII> (0.28)
<PER-SHARE-GAIN-APPREC> 5.97
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 23.51
<EXPENSE-RATIO> 3.08
</TABLE>
