<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 012
<NAME> CALAMOS CONVERTIBLE FUND CLASS B
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 193,596,446
<INVESTMENTS-AT-VALUE> 228,958,687
<RECEIVABLES> 2,682,984
<ASSETS-OTHER> 11,185,626
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 242,827,297
<PAYABLE-FOR-SECURITIES> 12,800
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 915,495
<TOTAL-LIABILITIES> 928,295
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 173,756,322
<SHARES-COMMON-STOCK> 10,257,671
<SHARES-COMMON-PRIOR> 8,675,538
<ACCUMULATED-NII-CURRENT> 257,797
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32,827,189
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 35,057,694
<NET-ASSETS> 241,899,002
<DIVIDEND-INCOME> 1,265,918
<INTEREST-INCOME> 2,418,459
<OTHER-INCOME> 0
<EXPENSES-NET> 1,401,714
<NET-INVESTMENT-INCOME> 2,282,663
<REALIZED-GAINS-CURRENT> 7,626,313
<APPREC-INCREASE-CURRENT> 1,809,146
<NET-CHANGE-FROM-OPS> 11,718,122
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2,199,840
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,153,038
<NUMBER-OF-SHARES-REDEEMED> 614,101
<SHARES-REINVESTED> 43,195
<NET-CHANGE-IN-ASSETS> 44,803,910
<ACCUMULATED-NII-PRIOR> 174,974
<ACCUMULATED-GAINS-PRIOR> 25,200,876
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 745,577
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,401,714
<AVERAGE-NET-ASSETS> 118,060
<PER-SHARE-NAV-BEGIN> 23.03
<PER-SHARE-NII> 0.01
<PER-SHARE-GAIN-APPREC> 0.51
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 23.55
<EXPENSE-RATIO> 1.80
</TABLE>
