MAINSTAY INSTITUTIONAL FUNDS INC
NSAR-A, 1998-08-31
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<PAGE>      PAGE  1
000 A000000 06/30/98
000 C000000 868307
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MAINSTAY INSTITUTIONAL FUNDS INC.
001 B000000 811-6175
001 C000000 2125768170
002 A000000 51 MADISON AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10010
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000 11
007 C010100  1
007 C020100 MONEY MARKET FUND
007 C030100 N
007 C010200  2
007 C020200 SHORT-TERM BOND FUND
007 C030200 N
007 C010300  3
007 C020300 BOND FUND
007 C030300 N
007 C010400  4
007 C020400 INDEXED BOND FUND
007 C030400 N
007 C010500  5
007 C020500 MULTI-ASSET FUND
007 C030500 N
007 C010600  6
007 C020600 VALUE EQUITY FUND
007 C030600 N
007 C010700  7
007 C020700 GROWTH EQUITY FUND
007 C030700 N
007 C010800  8
007 C020800 INDEXED EQUITY FUND
007 C030800 N
007 C010900  9
007 C020900 EAFE INDEX FUND
007 C030900 N
007 C011000 10
007 C021000 INTERNATIONAL BOND FUND
<PAGE>      PAGE  2
007 C031000 N
007 C011100 11
007 C021100 INTERNATIONAL EQUITY FUND
007 C031100 N
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
011 A00AA01 NYLIFE DISTRIBUTORS INC.
011 B00AA01 8-46655
011 C01AA01 PARSIPPANY
011 C02AA01 NJ
011 C03AA01 07054
012 A00AA01 BOSTON FINANCIAL DATA SERVICES
012 B00AA01 84-0896
012 C01AA01 NORTH QUINCY
012 C02AA01 MA
012 C03AA01 02171
013 A00AA01 PRICEWATERHOUSECOOPERS
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10022
014 A00AA01 NYLIFE SECURITIES INC.
014 B00AA01 8-15517
014 A00AA02 NYLIFE DISTRIBUTORS INC.
014 B00AA02 8-46655
015 A00AA01 BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10286
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<PAGE>      PAGE  3
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<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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008 A000201 MACKAY-SHIELDS FINANCIAL CORPORATION
008 B000201 S
008 C000201 801-5594
008 D010201 NEW YORK
008 D020201 NY
008 D030201 10019
008 A000202 MAINSTAY MANAGEMENT, INC.
008 B000202 A
008 C000202 801-54912
008 D010202 PARSIPPANY
008 D020202 NJ
008 D030202 07054
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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008 A000301 MACKAY-SHIELDS FINANCIAL CORPORATION
008 B000301 S
008 C000301 801-5594
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008 A000302 MAINSTAY MANAGEMENT, INC.
008 B000302 A
008 C000302 801-54912
008 D010302 PARSIPPANY
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008 D030302 07054
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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008 A000401 MONITOR CAPITAL ADVISORS, INC.
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028 C010800     59510
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028 D010800     53004
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<PAGE>      PAGE  38
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028 D040800     10315
028 E010800     10670
028 E020800         0
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046  000800 N
047  000800 Y
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048 I010800        0
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050  000800 N
051  000800 N
052  000800 N
053 A000800 Y
053 B000800 Y
053 C000800 N
058 A000800 N
059  000800 Y
060 A000800 Y
<PAGE>      PAGE  39
060 B000800 Y
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062 H000800   0.0
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062 P000800   0.0
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062 R000800   0.0
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066 A000800 Y
066 B000800 N
066 C000800 Y
066 D000800 N
066 E000800 N
066 F000800 N
066 G000800 N
067  000800 N
068 A000800 N
068 B000800 Y
069  000800 Y
070 A010800 Y
070 A020800 N
070 B010800 Y
070 B020800 N
070 C010800 N
070 C020800 N
070 D010800 Y
070 D020800 N
070 E010800 N
070 E020800 N
070 F010800 Y
070 F020800 Y
070 G010800 Y
070 G020800 N
070 H010800 Y
070 H020800 N
070 I010800 N
070 I020800 N
<PAGE>      PAGE  40
070 J010800 Y
070 J020800 N
070 K010800 N
070 K020800 N
070 L010800 Y
070 L020800 N
070 M010800 Y
070 M020800 N
070 N010800 Y
070 N020800 N
070 O010800 Y
070 O020800 N
070 P010800 N
070 P020800 N
070 Q010800 Y
070 Q020800 Y
070 R010800 N
070 R020800 N
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072 W000800       24
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072 Y000800     1494
072 Z000800     7955
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<PAGE>      PAGE  41
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074 V010800    31.80
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074 Y000800   113418
075 A000800        0
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076  000800     0.00
008 A000901 MONITOR CAPITAL ADVISORS, INC.
008 B000901 S
008 C000901 801-34412
008 D010901 PRINCETON
008 D020901 NJ
008 D030901 08540
008 D040901 6242
008 A000902 MAINSTAY MANAGEMENT, INC.
008 B000902 A
008 C000902 801-54912
<PAGE>      PAGE  42
008 D010902 PARSIPPANY
008 D020902 NJ
008 D030902 07054
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045  000900 Y
046  000900 N
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<PAGE>      PAGE  43
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048 I010900        0
048 I020900 0.000
048 J010900        0
048 J020900 0.000
048 K010900        0
048 K020900 0.000
049  000900 N
050  000900 N
051  000900 N
052  000900 N
053 A000900 Y
053 B000900 Y
053 C000900 N
058 A000900 N
059  000900 Y
060 A000900 Y
060 B000900 Y
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<PAGE>      PAGE  44
066 D000900 Y
066 E000900 N
066 F000900 N
066 G000900 N
067  000900 N
068 A000900 N
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070 B010900 Y
070 B020900 N
070 C010900 N
070 C020900 N
070 D010900 Y
070 D020900 N
070 E010900 Y
070 E020900 N
070 F010900 Y
070 F020900 Y
070 G010900 Y
070 G020900 N
070 H010900 Y
070 H020900 N
070 I010900 N
070 I020900 N
070 J010900 Y
070 J020900 N
070 K010900 N
070 K020900 N
070 L010900 Y
070 L020900 Y
070 M010900 Y
070 M020900 Y
070 N010900 Y
070 N020900 N
070 O010900 Y
070 O020900 N
070 P010900 N
070 P020900 N
070 Q010900 Y
070 Q020900 Y
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<PAGE>      PAGE  45
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<PAGE>      PAGE  46
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008 A001001 MACKAY-SHIELDS FINANCIAL CORPORATION
008 B001001 S
008 C001001 801-5594
008 D011001 NEW YORK
008 D021001 NY
008 D031001 10019
008 A001002 MAINSTAY MANAGEMENT, INC.
008 B001002 A
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008 D011002 PARSIPPANY
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008 D031002 07054
024  001000 Y
025 A001001 GOLDMAN SACHS & CO (FORWARD)
025 C001001 D
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025 A001002 MERRILL LYNCH CORP (FORWARD)
025 C001002 D
025 D001002     400
025 A001003 DEUTSCHE PFANDBRIEF BANK 5.7
025 C001003 D
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<PAGE>      PAGE  47
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<PAGE>      PAGE  48
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052  001000 N
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062 P001000  16.5
062 Q001000  69.1
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063 A001000   0
063 B001000  7.5
064 A001000 N
064 B001000 N
066 A001000 N
067  001000 N
068 A001000 N
068 B001000 Y
069  001000 N
070 A011000 Y
070 A021000 N
070 B011000 N
070 B021000 N
070 C011000 Y
070 C021000 N
070 D011000 N
070 D021000 N
<PAGE>      PAGE  49
070 E011000 Y
070 E021000 N
070 F011000 N
070 F021000 N
070 G011000 Y
070 G021000 N
070 H011000 N
070 H021000 N
070 I011000 Y
070 I021000 N
070 J011000 Y
070 J021000 N
070 K011000 Y
070 K021000 N
070 L011000 Y
070 L021000 Y
070 M011000 Y
070 M021000 Y
070 N011000 Y
070 N021000 N
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070 O021000 N
070 P011000 Y
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<PAGE>      PAGE  50
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<PAGE>      PAGE  51
008 A001101 MACKAY-SHIELDS FINANCIAL CORPORATION
008 B001101 S
008 C001101 801-5594
008 D011101 NEW YORK
008 D021101 NY
008 D031101 10019
008 A001102 MAINSTAY MANAGEMENT, INC.
008 B001102 A
008 C001102 801-54912
008 D011102 PARSIPPANY
008 D021102 NJ
008 D031102 07054
024  001100 Y
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025 C001101 D
025 D001101    4629
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025 D001102    4269
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025 C001103 E
025 D001103    1089
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<PAGE>      PAGE  52
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050  001100 N
<PAGE>      PAGE  53
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052  001100 N
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066 A001100 Y
066 B001100 N
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066 E001100 N
066 F001100 N
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067  001100 N
068 A001100 N
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069  001100 N
070 A011100 Y
070 A021100 N
070 B011100 Y
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070 C011100 N
070 C021100 N
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070 D021100 N
070 E011100 N
070 E021100 N
<PAGE>      PAGE  54
070 F011100 Y
070 F021100 N
070 G011100 Y
070 G021100 N
070 H011100 Y
070 H021100 N
070 I011100 Y
070 I021100 N
070 J011100 Y
070 J021100 N
070 K011100 Y
070 K021100 N
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070 L021100 Y
070 M011100 Y
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070 O021100 N
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070 P021100 N
070 Q011100 N
070 Q021100 N
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070 R021100 N
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<PAGE>      PAGE  55
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<PAGE>      PAGE  56
025 D001303       0
025 D001304       0
025 D001305       0
025 D001306       0
025 D001307       0
025 D001308       0
SIGNATURE   CARMEN GUZMAN LOWREY                         
TITLE       ATTORNEY            
 

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

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL MONEY MARKET FUND
<SERIES>                      
   <NUMBER>                   1
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          280,435,177
<INVESTMENTS-AT-VALUE>                         280,435,177
<RECEIVABLES>                                  1,558,847
<ASSETS-OTHER>                                 969
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 281,994,993
<PAYABLE-FOR-SECURITIES>                       0
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      1,256,037
<TOTAL-LIABILITIES>                            1,256,037
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       280,743,286
<SHARES-COMMON-STOCK>                          193,490,302
<SHARES-COMMON-PRIOR>                          190,323,265
<ACCUMULATED-NII-CURRENT>                      0
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (4,330)
<ACCUM-APPREC-OR-DEPREC>                       0
<NET-ASSETS>                                   280,738,956
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              7,715,169
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (768,461)
<NET-INVESTMENT-INCOME>                        6,945,708
<REALIZED-GAINS-CURRENT>                       62
<APPREC-INCREASE-CURRENT>                      0
<NET-CHANGE-FROM-OPS>                          6,945,770
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      (5,141,118)
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        123,853,809
<NUMBER-OF-SHARES-REDEEMED>                    (126,651,347)
<SHARES-REINVESTED>                            5,164,576
<NET-CHANGE-IN-ASSETS>                         4,971,690
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (4,392)
<GROSS-ADVISORY-FEES>                          136,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                952,000
<AVERAGE-NET-ASSETS>                           273,514,000
<PER-SHARE-NAV-BEGIN>                          1.000
<PER-SHARE-NII>                                0.050
<PER-SHARE-GAIN-APPREC>                        0.000
<PER-SHARE-DIVIDEND>                           (0.050)
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            1.005
<EXPENSE-RATIO>                                0.500
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL MONEY MARKET FUND
<SERIES>                      
   <NUMBER>                   1
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          280,435,177
<INVESTMENTS-AT-VALUE>                         280,435,177
<RECEIVABLES>                                  1,558,847
<ASSETS-OTHER>                                 969
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 281,994,993
<PAYABLE-FOR-SECURITIES>                       0
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      1,256,037
<TOTAL-LIABILITIES>                            1,256,037
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       280,743,286
<SHARES-COMMON-STOCK>                          87,252,964
<SHARES-COMMON-PRIOR>                          64,228,251
<ACCUMULATED-NII-CURRENT>                      0
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (4,330)
<ACCUM-APPREC-OR-DEPREC>                       0
<NET-ASSETS>                                   280,743,286
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              7,715,169
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (769,481)
<NET-INVESTMENT-INCOME>                        6,945,708
<REALIZED-GAINS-CURRENT>                       62
<APPREC-INCREASE-CURRENT>                      0
<NET-CHANGE-FROM-OPS>                          6,945,770
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      (1,804,590)
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        45,517,718
<NUMBER-OF-SHARES-REDEEMED>                    (24,242,703)
<SHARES-REINVESTED>                            1,749,718
<NET-CHANGE-IN-ASSETS>                         28,165,913
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (4,392)
<GROSS-ADVISORY-FEES>                          138,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                952,000
<AVERAGE-NET-ASSETS>                           273,514,000
<PER-SHARE-NAV-BEGIN>                          1.000
<PER-SHARE-NII>                                0.050
<PER-SHARE-GAIN-APPREC>                        0.000
<PER-SHARE-DIVIDEND>                           (0.050)
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            1.000
<EXPENSE-RATIO>                                0.750
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL SHORT-TERM BOND FUND
<SERIES>                      
   <NUMBER>                   2
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          42,829,633
<INVESTMENTS-AT-VALUE>                         42,760,738
<RECEIVABLES>                                  1,694,330
<ASSETS-OTHER>                                 2,826
<OTHER-ITEMS-ASSETS>                           9,039,913
<TOTAL-ASSETS>                                 53,497,807
<PAYABLE-FOR-SECURITIES>                       1,964,850
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      9,113,456
<TOTAL-LIABILITIES>                            11,078,306
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       48,238,598
<SHARES-COMMON-STOCK>                          4,264,088
<SHARES-COMMON-PRIOR>                          4,968,960
<ACCUMULATED-NII-CURRENT>                      1,261,468
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (7,011,670)
<ACCUM-APPREC-OR-DEPREC>                       (68,895)
<NET-ASSETS>                                   42,419,501
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              1,383,164
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (125,799)
<NET-INVESTMENT-INCOME>                        1,257,365
<REALIZED-GAINS-CURRENT>                       105,257
<APPREC-INCREASE-CURRENT>                      (202,703)
<NET-CHANGE-FROM-OPS>                          1,159,919
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        650,171
<NUMBER-OF-SHARES-REDEEMED>                    1,355,043
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         (5,504,813)
<ACCUMULATED-NII-PRIOR>                        4,103
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (7,116,927)
<GROSS-ADVISORY-FEES>                          31,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                186,000
<AVERAGE-NET-ASSETS>                           40,355,000
<PER-SHARE-NAV-BEGIN>                          9.390
<PER-SHARE-NII>                                0.290
<PER-SHARE-GAIN-APPREC>                        (0.030)
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            9.650
<EXPENSE-RATIO>                                0.600
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL SHORT-TERM BOND FUND
<SERIES>                      
   <NUMBER>                   2
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          42,829,633
<INVESTMENTS-AT-VALUE>                         42,760,738
<RECEIVABLES>                                  1,694,330
<ASSETS-OTHER>                                 2,826
<OTHER-ITEMS-ASSETS>                           9,039,913
<TOTAL-ASSETS>                                 53,497,807
<PAYABLE-FOR-SECURITIES>                       1,964,850
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      9,113,456
<TOTAL-LIABILITIES>                            11,078,306
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       48,238,598
<SHARES-COMMON-STOCK>                          133,548
<SHARES-COMMON-PRIOR>                          158,386
<ACCUMULATED-NII-CURRENT>                      1,261,468
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (7,011,670)
<ACCUM-APPREC-OR-DEPREC>                       (68,895)
<NET-ASSETS>                                   42,419,501
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              1,383,164
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (125,799)
<NET-INVESTMENT-INCOME>                        1,257,365
<REALIZED-GAINS-CURRENT>                       105,257
<APPREC-INCREASE-CURRENT>                      (202,703)
<NET-CHANGE-FROM-OPS>                          1,159,919
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        18,001
<NUMBER-OF-SHARES-REDEEMED>                    (42,839)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         924,495
<ACCUMULATED-NII-PRIOR>                        4,103
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (7,116,927)
<GROSS-ADVISORY-FEES>                          31,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                186,000
<AVERAGE-NET-ASSETS>                           1,359,000
<PER-SHARE-NAV-BEGIN>                          9.380
<PER-SHARE-NII>                                0.270
<PER-SHARE-GAIN-APPREC>                        (0.030)
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            9.620
<EXPENSE-RATIO>                                0.850
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL BOND FUND
<SERIES>                      
   <NUMBER>                   3
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          175,054,537
<INVESTMENTS-AT-VALUE>                         175,991,323
<RECEIVABLES>                                  18,096,309
<ASSETS-OTHER>                                 0
<OTHER-ITEMS-ASSETS>                           30,630,000
<TOTAL-ASSETS>                                 224,717,632
<PAYABLE-FOR-SECURITIES>                       19,338,276
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      30,872,554
<TOTAL-LIABILITIES>                            50,210,830
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       177,717,443
<SHARES-COMMON-STOCK>                          16,957,628
<SHARES-COMMON-PRIOR>                          18,942,017
<ACCUMULATED-NII-CURRENT>                      5,100,630
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (9,248,057)
<ACCUM-APPREC-OR-DEPREC>                       936,786
<NET-ASSETS>                                   174,506,802
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              5,774,030
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (673,400)
<NET-INVESTMENT-INCOME>                        5,100,630
<REALIZED-GAINS-CURRENT>                       3,474,263
<APPREC-INCREASE-CURRENT>                      (1,807,342)
<NET-CHANGE-FROM-OPS>                          6,767,551
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        890,151
<NUMBER-OF-SHARES-REDEEMED>                    (2,874,540)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         (12,750,995)
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (12,722,320)
<GROSS-ADVISORY-FEES>                          179,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                767,000
<AVERAGE-NET-ASSETS>                           176,742,000
<PER-SHARE-NAV-BEGIN>                          9.710
<PER-SHARE-NII>                                0.250
<PER-SHARE-GAIN-APPREC>                        0.120
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            10.080
<EXPENSE-RATIO>                                0.750
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL BOND FUND
<SERIES>                      
   <NUMBER>                   3
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          175,054,537
<INVESTMENTS-AT-VALUE>                         175,991,323
<RECEIVABLES>                                  18,096,309
<ASSETS-OTHER>                                 0
<OTHER-ITEMS-ASSETS>                           30,630,000
<TOTAL-ASSETS>                                 224,717,632
<PAYABLE-FOR-SECURITIES>                       19,338,276
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      30,872,554
<TOTAL-LIABILITIES>                            50,210,830
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       177,717,443
<SHARES-COMMON-STOCK>                          349,630
<SHARES-COMMON-PRIOR>                          158,197
<ACCUMULATED-NII-CURRENT>                      5,100,630
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (9,248,057)
<ACCUM-APPREC-OR-DEPREC>                       936,786
<NET-ASSETS>                                   174,506,802
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              5,774,030
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (673,400)
<NET-INVESTMENT-INCOME>                        5,100,630
<REALIZED-GAINS-CURRENT>                       3,474,263
<APPREC-INCREASE-CURRENT>                      (1,807,342)
<NET-CHANGE-FROM-OPS>                          6,767,551
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        251,380
<NUMBER-OF-SHARES-REDEEMED>                    (59,947)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         8,648,657
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (12,722,320)
<GROSS-ADVISORY-FEES>                          179,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                767,000
<AVERAGE-NET-ASSETS>                           3,240,000
<PER-SHARE-NAV-BEGIN>                          9.680
<PER-SHARE-NII>                                0.230
<PER-SHARE-GAIN-APPREC>                        0.130
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            10.040
<EXPENSE-RATIO>                                1.000
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INDEXED BOND FUND
<SERIES>                      
   <NUMBER>                   4
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          147,770,613
<INVESTMENTS-AT-VALUE>                         152,811,743
<RECEIVABLES>                                  3,208,621
<ASSETS-OTHER>                                 71,975
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 156,092,339
<PAYABLE-FOR-SECURITIES>                       1,094,408
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      90,888
<TOTAL-LIABILITIES>                            1,185,296
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       147,046,809
<SHARES-COMMON-STOCK>                          13,581,299
<SHARES-COMMON-PRIOR>                          10,980,470
<ACCUMULATED-NII-CURRENT>                      4,605,729
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (1,790,245)
<ACCUM-APPREC-OR-DEPREC>                       5,044,750
<NET-ASSETS>                                   154,907,043
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              4,961,370
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (358,461)
<NET-INVESTMENT-INCOME>                        4,602,909
<REALIZED-GAINS-CURRENT>                       (188,310)
<APPREC-INCREASE-CURRENT>                      811,877
<NET-CHANGE-FROM-OPS>                          5,226,476
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        3,802,368
<NUMBER-OF-SHARES-REDEEMED>                    (1,201,539)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         33,463,914
<ACCUMULATED-NII-PRIOR>                        2,820
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (1,601,935)
<GROSS-ADVISORY-FEES>                          71,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                454,000
<AVERAGE-NET-ASSETS>                           139,556,000
<PER-SHARE-NAV-BEGIN>                          10.740
<PER-SHARE-NII>                                0.320
<PER-SHARE-GAIN-APPREC>                        0.080
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.140
<EXPENSE-RATIO>                                0.500
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INDEXED BOND FUND
<SERIES>                      
   <NUMBER>                   4
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          147,770,613
<INVESTMENTS-AT-VALUE>                         152,811,743
<RECEIVABLES>                                  3,208,621
<ASSETS-OTHER>                                 71,975
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 156,092,339
<PAYABLE-FOR-SECURITIES>                       1,094,408
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      90,888
<TOTAL-LIABILITIES>                            1,185,296
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       147,046,809
<SHARES-COMMON-STOCK>                          327,051
<SHARES-COMMON-PRIOR>                          280,755
<ACCUMULATED-NII-CURRENT>                      4,605,729
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (1,790,245)
<ACCUM-APPREC-OR-DEPREC>                       5,044,750
<NET-ASSETS>                                   154,907,043
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              4,961,370
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (358,461)
<NET-INVESTMENT-INCOME>                        4,602,909
<REALIZED-GAINS-CURRENT>                       (188,310)
<APPREC-INCREASE-CURRENT>                      811,877
<NET-CHANGE-FROM-OPS>                          5,226,476
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        79,114
<NUMBER-OF-SHARES-REDEEMED>                    (32,818)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         5,733,063
<ACCUMULATED-NII-PRIOR>                        2,820
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     (1,601,935)
<GROSS-ADVISORY-FEES>                          71,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                454,000
<AVERAGE-NET-ASSETS>                           3,345,000
<PER-SHARE-NAV-BEGIN>                          10.740
<PER-SHARE-NII>                                0.300
<PER-SHARE-GAIN-APPREC>                        0.080
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.120
<EXPENSE-RATIO>                                0.750
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL MULTI-ASSET FUND
<SERIES>                      
   <NUMBER>                   5
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          408,211,957
<INVESTMENTS-AT-VALUE>                         496,805,262
<RECEIVABLES>                                    3,127,835
<ASSETS-OTHER>                                      46,165
<OTHER-ITEMS-ASSETS>                                     0
<TOTAL-ASSETS>                                 499,979,262
<PAYABLE-FOR-SECURITIES>                         2,011,883
<SENIOR-LONG-TERM-DEBT>                                  0
<OTHER-ITEMS-LIABILITIES>                          506,210
<TOTAL-LIABILITIES>                              2,518,093
<SENIOR-EQUITY>                                          0
<PAID-IN-CAPITAL-COMMON>                       341,939,362
<SHARES-COMMON-STOCK>                           28,556,128
<SHARES-COMMON-PRIOR>                           27,977,073
<ACCUMULATED-NII-CURRENT>                        5,843,717
<OVERDISTRIBUTION-NII>                                   0
<ACCUMULATED-NET-GAINS>                         58,249,500
<OVERDISTRIBUTION-GAINS>                                 0
<ACCUM-APPREC-OR-DEPREC>                        91,428,590
<NET-ASSETS>                                   481,615,679
<DIVIDEND-INCOME>                                2,068,800
<INTEREST-INCOME>                                5,569,100
<OTHER-INCOME>                                           0
<EXPENSES-NET>                                  (1,831,193)
<NET-INVESTMENT-INCOME>                          5,806,707
<REALIZED-GAINS-CURRENT>                        31,942,647
<APPREC-INCREASE-CURRENT>                       21,301,107
<NET-CHANGE-FROM-OPS>                           59,050,461
<EQUALIZATION>                                           0
<DISTRIBUTIONS-OF-INCOME>                                0
<DISTRIBUTIONS-OF-GAINS>                                 0
<DISTRIBUTIONS-OTHER>                                    0
<NUMBER-OF-SHARES-SOLD>                          2,496,877
<NUMBER-OF-SHARES-REDEEMED>                     (1,917,822)
<SHARES-REINVESTED>                                      0
<NET-CHANGE-IN-ASSETS>                          68,536,014
<ACCUMULATED-NII-PRIOR>                             37,010
<ACCUMULATED-GAINS-PRIOR>                       26,306,853
<OVERDISTRIB-NII-PRIOR>                                  0
<OVERDIST-NET-GAINS-PRIOR>                               0
<GROSS-ADVISORY-FEES>                              349,000
<INTEREST-EXPENSE>                                       0
<GROSS-EXPENSE>                                  1,831,000
<AVERAGE-NET-ASSETS>                           468,918,000
<PER-SHARE-NAV-BEGIN>                               14.830
<PER-SHARE-NII>                                      0.200
<PER-SHARE-GAIN-APPREC>                              1.840
<PER-SHARE-DIVIDEND>                                 0.000
<PER-SHARE-DISTRIBUTIONS>                            0.000
<RETURNS-OF-CAPITAL>                                 0.000
<PER-SHARE-NAV-END>                                 16.870
<EXPENSE-RATIO>                                      0.780
<AVG-DEBT-OUTSTANDING>                                   0
<AVG-DEBT-PER-SHARE>                                     0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL MULTI-ASSET FUND
<SERIES>                      
   <NUMBER>                   5
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          408,211,957
<INVESTMENTS-AT-VALUE>                         496,805,262
<RECEIVABLES>                                  3,127,835
<ASSETS-OTHER>                                 46,165
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 499,979,262
<PAYABLE-FOR-SECURITIES>                       2,011,883
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      506,210
<TOTAL-LIABILITIES>                            2,518,093
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       341,939,362
<SHARES-COMMON-STOCK>                          941,868
<SHARES-COMMON-PRIOR>                          667,802
<ACCUMULATED-NII-CURRENT>                      5,843,717
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        58,249,500
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       91,428,590
<NET-ASSETS>                                   15,845,490
<DIVIDEND-INCOME>                              2,068,800
<INTEREST-INCOME>                              5,569,100
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (1,831,193)
<NET-INVESTMENT-INCOME>                        5,806,707
<REALIZED-GAINS-CURRENT>                       31,942,647
<APPREC-INCREASE-CURRENT>                      21,301,107
<NET-CHANGE-FROM-OPS>                          59,050,461
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        341,054
<NUMBER-OF-SHARES-REDEEMED>                    (66,988)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         63,262,276
<ACCUMULATED-NII-PRIOR>                        37,010
<ACCUMULATED-GAINS-PRIOR>                      26,306,853
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          349,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                1,831,000
<AVERAGE-NET-ASSETS>                           468,918,000
<PER-SHARE-NAV-BEGIN>                          14.810
<PER-SHARE-NII>                                0.200
<PER-SHARE-GAIN-APPREC>                        1.810
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            16.820
<EXPENSE-RATIO>                                1.030
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL VALUE FUND
<SERIES>                      
   <NUMBER>                   6
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          886,172,542
<INVESTMENTS-AT-VALUE>                         998,903,377
<RECEIVABLES>                                  35,985,870
<ASSETS-OTHER>                                 1,246
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 1,034,890,493
<PAYABLE-FOR-SECURITIES>                       37,218,089
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      2,363,134
<TOTAL-LIABILITIES>                            39,581,223
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       755,984,575
<SHARES-COMMON-STOCK>                          57,925,169
<SHARES-COMMON-PRIOR>                          60,172,073
<ACCUMULATED-NII-CURRENT>                      4,950,051
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        121,643,809
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       112,730,835
<NET-ASSETS>                                   995,309,270
<DIVIDEND-INCOME>                              8,779,148
<INTEREST-INCOME>                              1,029,931
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 4,864,818
<NET-INVESTMENT-INCOME>                        4,944,261
<REALIZED-GAINS-CURRENT>                       96,217,540
<APPREC-INCREASE-CURRENT>                      (62,965,440)
<NET-CHANGE-FROM-OPS>                          38,196,361
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        3,407,065
<NUMBER-OF-SHARES-REDEEMED>                    (5,653,969)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         79,465
<ACCUMULATED-NII-PRIOR>                        5,790
<ACCUMULATED-GAINS-PRIOR>                      25,426,269
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          1,274,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                4,864,818
<AVERAGE-NET-ASSETS>                           1,027,852,000
<PER-SHARE-NAV-BEGIN>                          16.360
<PER-SHARE-NII>                                0.080
<PER-SHARE-GAIN-APPREC>                        0.550
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            16.990
<EXPENSE-RATIO>                                0.950
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>


<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL VALUE FUND
<SERIES>                      
   <NUMBER>                   6
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          886,172,542
<INVESTMENTS-AT-VALUE>                         998,903,377
<RECEIVABLES>                                  35,985,870
<ASSETS-OTHER>                                 1,246
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 1,034,890,493
<PAYABLE-FOR-SECURITIES>                       37,218,089
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      2,363,134
<TOTAL-LIABILITIES>                            39,581,223
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       755,984,575
<SHARES-COMMON-STOCK>                          658,843
<SHARES-COMMON-PRIOR>                          673,539
<ACCUMULATED-NII-CURRENT>                      4,950,051
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        121,643,809
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       112,730,835
<NET-ASSETS>                                   995,309,270
<DIVIDEND-INCOME>                              8,779,148
<INTEREST-INCOME>                              1,029,931
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 4,864,818
<NET-INVESTMENT-INCOME>                        4,994,261
<REALIZED-GAINS-CURRENT>                       96,217,540
<APPREC-INCREASE-CURRENT>                      (62,965,440)
<NET-CHANGE-FROM-OPS>                          38,196,361
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        59,977
<NUMBER-OF-SHARES-REDEEMED>                    (74,673)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         79,465
<ACCUMULATED-NII-PRIOR>                        5,790
<ACCUMULATED-GAINS-PRIOR>                      25,426,269
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          1,274,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                4,864,818
<AVERAGE-NET-ASSETS>                           1,027,852,000
<PER-SHARE-NAV-BEGIN>                          16.350
<PER-SHARE-NII>                                0.070
<PER-SHARE-GAIN-APPREC>                        0.540
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            16.960
<EXPENSE-RATIO>                                1.200
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL GROWTH EQUITY FUND
<SERIES>                      
   <NUMBER>                   7
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          433,477,985
<INVESTMENTS-AT-VALUE>                         852,510,787
<RECEIVABLES>                                  26,717,033
<ASSETS-OTHER>                                 2,728
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 879,230,548
<PAYABLE-FOR-SECURITIES>                       21,755,506
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      1,862,383
<TOTAL-LIABILITIES>                            23,617,889
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       409,388,513
<SHARES-COMMON-STOCK>                          27,764,211
<SHARES-COMMON-PRIOR>                          27,526,451
<ACCUMULATED-NII-CURRENT>                      (1,319,317)
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        28,510,661
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       419,032,802
<NET-ASSETS>                                   855,612,659
<DIVIDEND-INCOME>                              1,941,583
<INTEREST-INCOME>                              424,670
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 3,685,570
<NET-INVESTMENT-INCOME>                        (1,319,317)
<REALIZED-GAINS-CURRENT>                       19,667,073
<APPREC-INCREASE-CURRENT>                      120,303,044
<NET-CHANGE-FROM-OPS>                          138,650,800
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        2,404,360
<NUMBER-OF-SHARES-REDEEMED>                    (2,166,600)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         144,874,616
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      8,843,588
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          980,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                3,685,570
<AVERAGE-NET-ASSETS>                           778,331,000
<PER-SHARE-NAV-BEGIN>                          25.430
<PER-SHARE-NII>                                (0.050)
<PER-SHARE-GAIN-APPREC>                        4.980
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            30.360
<EXPENSE-RATIO>                                0.940
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL GROWTH EQUITY FUND
<SERIES>                      
   <NUMBER>                   7
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          433,477,985
<INVESTMENTS-AT-VALUE>                         852,510,787
<RECEIVABLES>                                  26,717,033
<ASSETS-OTHER>                                 2,728
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 879,230,548
<PAYABLE-FOR-SECURITIES>                       21,755,506
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      1,862,383
<TOTAL-LIABILITIES>                            23,617,889
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       409,388,513
<SHARES-COMMON-STOCK>                          426,216
<SHARES-COMMON-PRIOR>                          422,638
<ACCUMULATED-NII-CURRENT>                      (1,319,317)
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        28,510,661
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       419,032,802
<NET-ASSETS>                                   855,612,659
<DIVIDEND-INCOME>                              1,941,583
<INTEREST-INCOME>                              424,670
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 3,685,570
<NET-INVESTMENT-INCOME>                        (1,319,317)
<REALIZED-GAINS-CURRENT>                       19,667,073
<APPREC-INCREASE-CURRENT>                      120,303,044
<NET-CHANGE-FROM-OPS>                          138,650,800
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        50,676
<NUMBER-OF-SHARES-REDEEMED>                    (47,098)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         144,874,616
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      8,843,588
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          3,685,570
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                3,686,000
<AVERAGE-NET-ASSETS>                           11,908
<PER-SHARE-NAV-BEGIN>                          25.240
<PER-SHARE-NII>                                (0.080)
<PER-SHARE-GAIN-APPREC>                        4.930
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            30.090
<EXPENSE-RATIO>                                1.190
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INDEXED EUQITY FUND
<SERIES>                      
   <NUMBER>                   8
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          762,607,018
<INVESTMENTS-AT-VALUE>                         1,314,564,280
<RECEIVABLES>                                  12,283,638
<ASSETS-OTHER>                                 0
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 1,326,847,918
<PAYABLE-FOR-SECURITIES>                       5,968,567
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      2,205,106
<TOTAL-LIABILITIES>                            8,173,673
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       743,500,303
<SHARES-COMMON-STOCK>                          966,742
<SHARES-COMMON-PRIOR>                          512,405
<ACCUMULATED-NII-CURRENT>                      7,971,784
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        15,242,785
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       551,959,373
<NET-ASSETS>                                   1,318,674,245
<DIVIDEND-INCOME>                              8,464,173
<INTEREST-INCOME>                              1,286,947
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (1,796,003)
<NET-INVESTMENT-INCOME>                        7,955,117
<REALIZED-GAINS-CURRENT>                       11,619,144
<APPREC-INCREASE-CURRENT>                      165,604,213
<NET-CHANGE-FROM-OPS>                          185,178,474
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        578,743
<NUMBER-OF-SHARES-REDEEMED>                    (124,406)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         197,659,289
<ACCUMULATED-NII-PRIOR>                        16,667
<ACCUMULATED-GAINS-PRIOR>                      3,623,641
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          588,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                3,290,000
<AVERAGE-NET-ASSETS>                           1,184,794,000
<PER-SHARE-NAV-BEGIN>                          26.990
<PER-SHARE-NII>                                0.190
<PER-SHARE-GAIN-APPREC>                        4.490
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            31.670
<EXPENSE-RATIO>                                0.550
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INDEXED EQUITY FUND
<SERIES>                      
   <NUMBER>                   8
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          762,607,018
<INVESTMENTS-AT-VALUE>                         1,314,564,280
<RECEIVABLES>                                  12,283,638
<ASSETS-OTHER>                                 0
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 1,326,847,918
<PAYABLE-FOR-SECURITIES>                       5,968,567
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      2,205,106
<TOTAL-LIABILITIES>                            8,173,673
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       743,500,303
<SHARES-COMMON-STOCK>                          40,511,017
<SHARES-COMMON-PRIOR>                          35,714,243
<ACCUMULATED-NII-CURRENT>                      7,971,784
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        15,242,785
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       551,959,373
<NET-ASSETS>                                   1,318,674,245
<DIVIDEND-INCOME>                              8,464,173
<INTEREST-INCOME>                              1,286,947
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (1,796,003)
<NET-INVESTMENT-INCOME>                        7,955,117
<REALIZED-GAINS-CURRENT>                       11,619,144
<APPREC-INCREASE-CURRENT>                      165,604,213
<NET-CHANGE-FROM-OPS>                          185,178,474
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        7,896,506
<NUMBER-OF-SHARES-REDEEMED>                    (3,099,732)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         326,148,608
<ACCUMULATED-NII-PRIOR>                        16,667
<ACCUMULATED-GAINS-PRIOR>                      3,623,641
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          588,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                3,290,000
<AVERAGE-NET-ASSETS>                           1,184,794,000
<PER-SHARE-NAV-BEGIN>                          27.050
<PER-SHARE-NII>                                0.190
<PER-SHARE-GAIN-APPREC>                        4.560
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            31.800
<EXPENSE-RATIO>                                0.300
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL EAFE INDEX FUND
<SERIES>                      
   <NUMBER>                   9
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          44,568,620
<INVESTMENTS-AT-VALUE>                         57,332,763
<RECEIVABLES>                                  1,407,963
<ASSETS-OTHER>                                 18,355
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 58,759,081
<PAYABLE-FOR-SECURITIES>                       233,209
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      143,009
<TOTAL-LIABILITIES>                            376,218
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       42,069,502
<SHARES-COMMON-STOCK>                          4,894,308
<SHARES-COMMON-PRIOR>                          5,388,284
<ACCUMULATED-NII-CURRENT>                      0
<OVERDISTRIBUTION-NII>                         (14,646)
<ACCUMULATED-NET-GAINS>                        3,582,379
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       12,745,628
<NET-ASSETS>                                   58,382,863
<DIVIDEND-INCOME>                              723,045
<INTEREST-INCOME>                              24,071
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (274,398)
<NET-INVESTMENT-INCOME>                        472,718
<REALIZED-GAINS-CURRENT>                       3,625,574
<APPREC-INCREASE-CURRENT>                      4,394,782
<NET-CHANGE-FROM-OPS>                          8,493,074
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        1,109,597
<NUMBER-OF-SHARES-REDEEMED>                    (1,603,574)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         2,749,269
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        (487,364)
<OVERDIST-NET-GAINS-PRIOR>                     (43,195)
<GROSS-ADVISORY-FEES>                          44,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                382,000
<AVERAGE-NET-ASSETS>                           58,736,000
<PER-SHARE-NAV-BEGIN>                          10.240
<PER-SHARE-NII>                                0.090
<PER-SHARE-GAIN-APPREC>                        1.490
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.820
<EXPENSE-RATIO>                                0.940
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL EAFE INDEX FUND
<SERIES>                      
   <NUMBER>                   9
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          44,568,620
<INVESTMENTS-AT-VALUE>                         57,332,763
<RECEIVABLES>                                  1,407,963
<ASSETS-OTHER>                                 18,355
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 58,759,081
<PAYABLE-FOR-SECURITIES>                       233,209
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      143,009
<TOTAL-LIABILITIES>                            376,218
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       42,069,502
<SHARES-COMMON-STOCK>                          44,459
<SHARES-COMMON-PRIOR>                          43,045
<ACCUMULATED-NII-CURRENT>                      0
<OVERDISTRIBUTION-NII>                         (14,646)
<ACCUMULATED-NET-GAINS>                        3,582,379
<OVERDISTRIBUTION-GAINS>                       0
<ACCUM-APPREC-OR-DEPREC>                       12,745,628
<NET-ASSETS>                                   58,382,863
<DIVIDEND-INCOME>                              723,045
<INTEREST-INCOME>                              24,071
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (274,398)
<NET-INVESTMENT-INCOME>                        472,718
<REALIZED-GAINS-CURRENT>                       3,625,574
<APPREC-INCREASE-CURRENT>                      4,394,782
<NET-CHANGE-FROM-OPS>                          8,493,074
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        4,300
<NUMBER-OF-SHARES-REDEEMED>                    (2,886)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         8,510,561
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        (487,364)
<OVERDIST-NET-GAINS-PRIOR>                     (43,195)
<GROSS-ADVISORY-FEES>                          44,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                382,000
<AVERAGE-NET-ASSETS>                           58,736,000
<PER-SHARE-NAV-BEGIN>                          10.200
<PER-SHARE-NII>                                0.070
<PER-SHARE-GAIN-APPREC>                        1.490
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.760
<EXPENSE-RATIO>                                1.190
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INTERNATIONAL BOND FUND
<SERIES>                      
   <NUMBER>                   10
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                                   1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          51,567,067
<INVESTMENTS-AT-VALUE>                         51,240,328
<RECEIVABLES>                                  5,209,635
<ASSETS-OTHER>                                 1,360,562
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 57,810,525
<PAYABLE-FOR-SECURITIES>                       3,755,056
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      411,225
<TOTAL-LIABILITIES>                            4,166,281
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       52,505,000
<SHARES-COMMON-STOCK>                          5,145,345
<SHARES-COMMON-PRIOR>                          4,839,358
<ACCUMULATED-NII-CURRENT>                      1,583,383
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (313,063)
<ACCUM-APPREC-OR-DEPREC>                       (131,076)
<NET-ASSETS>                                   53,644,244
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              1,736,066
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (242,559)
<NET-INVESTMENT-INCOME>                        1,493,507
<REALIZED-GAINS-CURRENT>                       (315,225)
<APPREC-INCREASE-CURRENT>                      482,511
<NET-CHANGE-FROM-OPS>                          1,660,793
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        463,524
<NUMBER-OF-SHARES-REDEEMED>                    (157,537)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         4,809,500
<ACCUMULATED-NII-PRIOR>                        89,876
<ACCUMULATED-GAINS-PRIOR>                      2,162
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          76,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                279,000
<AVERAGE-NET-ASSETS>                           51,425,000
<PER-SHARE-NAV-BEGIN>                          10.050
<PER-SHARE-NII>                                0.290
<PER-SHARE-GAIN-APPREC>                        0.040
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            10.380
<EXPENSE-RATIO>                                0.950
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        MAINSTAY INSTITUTIONAL INTERNATIONAL BOND FUND
<SERIES>                      
   <NUMBER>                   10
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          51,567,067
<INVESTMENTS-AT-VALUE>                         51,240,328
<RECEIVABLES>                                  5,209,635
<ASSETS-OTHER>                                 1,360,562
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 57,810,525
<PAYABLE-FOR-SECURITIES>                       3,755,056
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      411,225
<TOTAL-LIABILITIES>                            4,166,281
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       52,505,000
<SHARES-COMMON-STOCK>                          22,147
<SHARES-COMMON-PRIOR>                          23,480
<ACCUMULATED-NII-CURRENT>                      1,583,383
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (313,063)
<ACCUM-APPREC-OR-DEPREC>                       (131,076)
<NET-ASSETS>                                   53,644,244
<DIVIDEND-INCOME>                              0
<INTEREST-INCOME>                              1,736,066
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 (242,559)
<NET-INVESTMENT-INCOME>                        1,493,507
<REALIZED-GAINS-CURRENT>                       (315,225)
<APPREC-INCREASE-CURRENT>                      482,511
<NET-CHANGE-FROM-OPS>                          1,660,793
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        2,115
<NUMBER-OF-SHARES-REDEEMED>                    (3,448)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         1,646,982
<ACCUMULATED-NII-PRIOR>                        89,876
<ACCUMULATED-GAINS-PRIOR>                      2,162
<OVERDISTRIB-NII-PRIOR>                        0
<OVERDIST-NET-GAINS-PRIOR>                     0
<GROSS-ADVISORY-FEES>                          76,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                279,000
<AVERAGE-NET-ASSETS>                           51,425,000
<PER-SHARE-NAV-BEGIN>                          10.010
<PER-SHARE-NII>                                0.290
<PER-SHARE-GAIN-APPREC>                        0.030
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            10.330
<EXPENSE-RATIO>                                1.200
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        INSTITUTIONAL INTERNATIONAL EQUITY FUND
<SERIES>                      
   <NUMBER>                   11
   <NAME>                     INSTITUTIONAL CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          108,833,460
<INVESTMENTS-AT-VALUE>                         132,726,806
<RECEIVABLES>                                  13,421,151
<ASSETS-OTHER>                                 17,192,687
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 163,340,644
<PAYABLE-FOR-SECURITIES>                       26,340,075
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      456,854
<TOTAL-LIABILITIES>                            26,796,929
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       114,916,165
<SHARES-COMMON-STOCK>                          11,629,272
<SHARES-COMMON-PRIOR>                          11,454,097
<ACCUMULATED-NII-CURRENT>                      984,176
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (3,358,332)
<ACCUM-APPREC-OR-DEPREC>                       24,001,706
<NET-ASSETS>                                   136,543,715
<DIVIDEND-INCOME>                              1,475,309
<INTEREST-INCOME>                              381,372
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 635,618
<NET-INVESTMENT-INCOME>                        1,221,063
<REALIZED-GAINS-CURRENT>                       2,291,381
<APPREC-INCREASE-CURRENT>                      16,771,193
<NET-CHANGE-FROM-OPS>                          20,283,637
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        850,091
<NUMBER-OF-SHARES-REDEEMED>                    (674,916)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         22,197,684
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        236,887
<OVERDIST-NET-GAINS-PRIOR>                     (5,649,713)
<GROSS-ADVISORY-FEES>                          222,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                646,000
<AVERAGE-NET-ASSETS>                           128,014,000
<PER-SHARE-NAV-BEGIN>                          9.930
<PER-SHARE-NII>                                0.100
<PER-SHARE-GAIN-APPREC>                        1.650
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.680
<EXPENSE-RATIO>                                1.000
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         0000868307
<NAME>                        INSTITUTIONAL INTERNATIONAL EQUITY FUND
<SERIES>                      
   <NUMBER>                   11
   <NAME>                     INSTITUTIONAL SERVICE CLASS
<MULTIPLIER>                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<INVESTMENTS-AT-COST>                          108,833,460
<INVESTMENTS-AT-VALUE>                         132,726,806
<RECEIVABLES>                                  13,421,151
<ASSETS-OTHER>                                 17,192,687
<OTHER-ITEMS-ASSETS>                           0
<TOTAL-ASSETS>                                 163,340,644
<PAYABLE-FOR-SECURITIES>                       26,340,075
<SENIOR-LONG-TERM-DEBT>                        0
<OTHER-ITEMS-LIABILITIES>                      456,854
<TOTAL-LIABILITIES>                            26,796,929
<SENIOR-EQUITY>                                0
<PAID-IN-CAPITAL-COMMON>                       114,916,165
<SHARES-COMMON-STOCK>                          58,380
<SHARES-COMMON-PRIOR>                          61,648
<ACCUMULATED-NII-CURRENT>                      984,176
<OVERDISTRIBUTION-NII>                         0
<ACCUMULATED-NET-GAINS>                        0
<OVERDISTRIBUTION-GAINS>                       (3,358,332)
<ACCUM-APPREC-OR-DEPREC>                       24,001,706
<NET-ASSETS>                                   136,543,715
<DIVIDEND-INCOME>                              1,475,309
<INTEREST-INCOME>                              381,372
<OTHER-INCOME>                                 0
<EXPENSES-NET>                                 635,618
<NET-INVESTMENT-INCOME>                        1,221,063
<REALIZED-GAINS-CURRENT>                       2,291,381
<APPREC-INCREASE-CURRENT>                      16,771,193
<NET-CHANGE-FROM-OPS>                          20,283,637
<EQUALIZATION>                                 0
<DISTRIBUTIONS-OF-INCOME>                      0
<DISTRIBUTIONS-OF-GAINS>                       0
<DISTRIBUTIONS-OTHER>                          0
<NUMBER-OF-SHARES-SOLD>                        3,120
<NUMBER-OF-SHARES-REDEEMED>                    (6,388)
<SHARES-REINVESTED>                            0
<NET-CHANGE-IN-ASSETS>                         20,248,392
<ACCUMULATED-NII-PRIOR>                        0
<ACCUMULATED-GAINS-PRIOR>                      0
<OVERDISTRIB-NII-PRIOR>                        (236,887)
<OVERDIST-NET-GAINS-PRIOR>                     (5,649,713)
<GROSS-ADVISORY-FEES>                          222,000
<INTEREST-EXPENSE>                             0
<GROSS-EXPENSE>                                646,000
<AVERAGE-NET-ASSETS>                           128,014,000
<PER-SHARE-NAV-BEGIN>                          9.850
<PER-SHARE-NII>                                0.100
<PER-SHARE-GAIN-APPREC>                        1.630
<PER-SHARE-DIVIDEND>                           0.000
<PER-SHARE-DISTRIBUTIONS>                      0.000
<RETURNS-OF-CAPITAL>                           0.000
<PER-SHARE-NAV-END>                            11.580
<EXPENSE-RATIO>                                1.250
<AVG-DEBT-OUTSTANDING>                         0
<AVG-DEBT-PER-SHARE>                           0
        


</TABLE>


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