WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917469
<NAME> LOOMIS SAYLES & COMPANY, L.P.
<SERIES>
<NUMBER> 09
<NAME> LSIT INTERMEDIATE DURATION FUND
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-START> OCT-01-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 20659332
<INVESTMENTS-AT-VALUE> 20225243
<RECEIVABLES> 315253
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 77329
<TOTAL-ASSETS> 20617825
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 38046
<TOTAL-LIABILITIES> 38046
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21080256
<SHARES-COMMON-STOCK> 2154158
<SHARES-COMMON-PRIOR> 1507340
<ACCUMULATED-NII-CURRENT> 30067
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (96455)
<ACCUM-APPREC-OR-DEPREC> (434089)
<NET-ASSETS> 20579779
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1206258
<OTHER-INCOME> 0
<EXPENSES-NET> (92165)
<NET-INVESTMENT-INCOME> 1114093
<REALIZED-GAINS-CURRENT> (13130)
<APPREC-INCREASE-CURRENT> 102659
<NET-CHANGE-FROM-OPS> 1203622
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1091374)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 541558
<NUMBER-OF-SHARES-REDEEMED> (10471)
<SHARES-REINVESTED> 115731
<NET-CHANGE-IN-ASSETS> 6208701
<ACCUMULATED-NII-PRIOR> 8348
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (84325)
<GROSS-ADVISORY-FEES> 67029
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 166370
<AVERAGE-NET-ASSETS> 16757200
<PER-SHARE-NAV-BEGIN> 9.53
<PER-SHARE-NII> 0.62
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> (0.61)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.55
<EXPENSE-RATIO> 0.55
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>