WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

 

<ARTICLE> 6
<CIK> 0000872649
<NAME> LOOMIS SAYLES & COMPANY, L.P.

   <NUMBER> 021
   <NAME> LOOMIS SAYLES CORE VALUE FUND, INSTITUTIONAL

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-2000
<PERIOD-START>                             OCT-01-1999
<PERIOD-END>                               MAR-31-2000
<INVESTMENTS-AT-COST>                         46890184
<INVESTMENTS-AT-VALUE>                        49367048
<RECEIVABLES>                                  1159957
<ASSETS-OTHER>                                  344437
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                50871442
<PAYABLE-FOR-SECURITIES>                        256806
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        51629
<TOTAL-LIABILITIES>                             308435
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      48800468
<SHARES-COMMON-STOCK>                          3435920
<SHARES-COMMON-PRIOR>                          4033770
<ACCUMULATED-NII-CURRENT>                       320471
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (1034796)
<ACCUM-APPREC-OR-DEPREC>                       2476864
<NET-ASSETS>                                  50563007
<DIVIDEND-INCOME>                               558420
<INTEREST-INCOME>                                20091
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (255289)
<NET-INVESTMENT-INCOME>                         323222
<REALIZED-GAINS-CURRENT>                     (1027957)
<APPREC-INCREASE-CURRENT>                      (50732)
<NET-CHANGE-FROM-OPS>                         (755467)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (632043)
<DISTRIBUTIONS-OF-GAINS>                     (7273628)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         414346
<NUMBER-OF-SHARES-REDEEMED>                  (1503741)
<SHARES-REINVESTED>                             491545
<NET-CHANGE-IN-ASSETS>                      (16767515)
<ACCUMULATED-NII-PRIOR>                         632576
<ACCUMULATED-GAINS-PRIOR>                      7319786
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           155411
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 266554
<AVERAGE-NET-ASSETS>                          61673301
<PER-SHARE-NAV-BEGIN>                            16.54
<PER-SHARE-NII>                                   0.09
<PER-SHARE-GAIN-APPREC>                         (0.02)
<PER-SHARE-DIVIDEND>                            (0.15)
<PER-SHARE-DISTRIBUTIONS>                       (1.85)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              14.61
<EXPENSE-RATIO>                                   0.82
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0