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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000880366
<NAME> SMITH BARNEY S & P 500 INDEX FUND - CLASS A
<SERIES>
   <NUMBER> 1
   <NAME> SMITH BARNEY INVESTMENT TRUST

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      233,205,056
<INVESTMENTS-AT-VALUE>                     271,203,166
<RECEIVABLES>                                3,915,943
<ASSETS-OTHER>                                  10,969
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             275,130,078
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,069,577
<TOTAL-LIABILITIES>                          2,069,577
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   243,809,630
<SHARES-COMMON-STOCK>                       16,828,532
<SHARES-COMMON-PRIOR>                       15,714,082
<ACCUMULATED-NII-CURRENT>                        (235)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        199,491
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    38,051,635
<NET-ASSETS>                               273,060,521
<DIVIDEND-INCOME>                              242,965
<INTEREST-INCOME>                               31,199
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 125,700
<NET-INVESTMENT-INCOME>                        148,464
<REALIZED-GAINS-CURRENT>                         (679)
<APPREC-INCREASE-CURRENT>                   14,495,829
<NET-CHANGE-FROM-OPS>                       14,643,614
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    1,261,406
<DISTRIBUTIONS-OF-GAINS>                         5,778
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,668,984
<NUMBER-OF-SHARES-REDEEMED>                    636,484
<SHARES-REINVESTED>                             81,950
<NET-CHANGE-IN-ASSETS>                      35,205,732
<ACCUMULATED-NII-PRIOR>                      1,263,970
<ACCUMULATED-GAINS-PRIOR>                      206,406
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           56,071
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                162,400
<AVERAGE-NET-ASSETS>                       237,391,649
<PER-SHARE-NAV-BEGIN>                            14.24
<PER-SHARE-NII>                                   0.01
<PER-SHARE-GAIN-APPREC>                           0.83
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                         0.08
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              15.00
<EXPENSE-RATIO>                                   0.60



</TABLE>