<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from Merrimac Cash Fund Premium Class,
form N-SAR for the period ended June 30, 2000
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 011
<NAME> Merrimac Cash Fund Premium Class
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 657,359,770
<INVESTMENTS-AT-VALUE> 657,359,770
<RECEIVABLES> 0
<ASSETS-OTHER> 12,268
<OTHER-ITEMS-ASSETS> 19,124
<TOTAL-ASSETS> 657,391,162
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,115,741
<TOTAL-LIABILITIES> 4,115,741
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 653,408,264
<SHARES-COMMON-STOCK> 653,134,898
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (131,863)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 653,002,111
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 23,634,247
<OTHER-INCOME> 0
<EXPENSES-NET> 791,776
<NET-INVESTMENT-INCOME> 22,842,471
<REALIZED-GAINS-CURRENT> (26,705)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 22,815,766
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (22,842,471)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,923,076,000
<NUMBER-OF-SHARES-REDEEMED> 2,086,978,100
<SHARES-REINVESTED> 8,829,122
<NET-CHANGE-IN-ASSETS> (155,072,978)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 795,474
<AVERAGE-NET-ASSETS> 758,973,390
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.21
</TABLE>
