MAINSTAY FUNDS
NSAR-B, 2000-02-29
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<PAGE>      PAGE  1
000 B000000 12/31/99
000 C000000 0000787441
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 THE MAINSTAY FUNDS
001 B000000 811-4550
001 C000000 2125765738
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 23
007 C010100  1
007 C020100 CAPITAL APPRECIATION FUND
007 C030100 N
007 C010200  2
007 C020200 VALUE FUND
007 C030200 N
007 C010300  3
007 C020300 CONVERTIBLE FUND
007 C030300 N
007 C010400  4
007 C020400 HIGH YIELD CORPORATE BOND FUND
007 C030400 N
007 C010500  5
007 C020500 GOVERNMENT FUND
007 C030500 N
007 C010600  6
007 C020600 MONEY MARKET FUND
007 C030600 N
007 C010700  7
007 C020700 TAX FREE BOND FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C020900 TOTAL RETURN FUND
007 C030900 N
007 C011000 10
007 C011100 11
007 C021100 EQUITY INDEX FUND
007 C031100 N
<PAGE>      PAGE  2
007 C011200 12
007 C021200 CALIFORNIA TAX FREE FUND
007 C031200 N
007 C011300 13
007 C021300 NEW YORK TAX FREE FUND
007 C031300 N
007 C011400 14
007 C021400 INTERNATIONAL BOND FUND
007 C031400 N
007 C011500 15
007 C021500 INTERNATIONAL EQUITY FUND
007 C031500 N
007 C011600 16
007 C021600 STRATEGIC INCOME FUND
007 C031600 N
007 C011700 17
007 C021700 STRATEGIC VALUE FUND
007 C031700 N
007 C011800 18
007 C021800 SMALL CAP GROWTH FUND
007 C031800 N
007 C011900 19
007 C021900 SMALL CAP VALUE FUND
007 C031900 N
007 C012000 20
007 C022000 BLUE CHIP GROWTH FUND
007 C032000 N
007 C012100 21
007 C022100 EQUITY INCOME FUND
007 C032100 N
007 C012200 22
007 C022200 GROWTH OPPORTUNITIES FUND
007 C032200 N
007 C012300 23
007 C022300 RESEARCH VALUE FUND
007 C032300 N
007 C012400 24
007 C022400 GLOBAL HIGH YIELD FUND
007 C032400 N
007 C012500 25
007 C022500 MAP EQUITY FUND
007 C032500 N
007 C012600 26
007 C012700 27
007 C012800 28
007 C012900 29
007 C013000 30
020 A000001 LEHMAN BROTHERS
020 B000001 13-2518466
020 C000001   2263
020 A000002 GOLDMAN SACHS & CO.
<PAGE>      PAGE  3
020 B000002 13-5108880
020 C000002    379
020 A000003 SALOMON SMITH BARNEY HOLDINGS
020 B000003 13-1912900
020 C000003    312
020 A000004 MORGAN STANLEY & CO.
020 B000004 13-2655998
020 C000004    292
020 A000005 MERRILL LYNCH PIERCE FENNER & SMITH
020 B000005 13-5674085
020 C000005    252
020 A000006 SOUNDVIEW FINANCIAL GROUP INC.
020 B000006 13-2998183
020 C000006    225
020 A000007 DONALDSON CO., INC.
020 B000007 58-1574040
020 C000007    212
020 A000008 JEFFERIES & CO., INC.
020 B000008 95-2622900
020 C000008    207
020 A000009 BEAR STEARNS SECURITIES CORP.
020 B000009 13-3299429
020 C000009    198
020 A000010 PRUDENTIAL SECURITIES
020 B000010 22-2347336
020 C000010    194
021  000000     7373
022 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH
022 B000001 13-5674085
022 C000001   3832512
022 D000001   1373570
022 A000002 GOLDMAN, SACHS & CO.
022 B000002 13-5108880
022 C000002   2898134
022 D000002    409522
022 A000003 ASSOCIATES CORP.
022 B000003 74-1494554
022 C000003         0
022 D000003   2311666
022 A000004 MORGAN STANLEY & CO.
022 B000004 13-2655998
022 C000004   1286286
022 D000004    407977
022 A000005 SALOMON SMITH BARNEY HOLDINGS, INC.
022 B000005 13-1912900
022 C000005    988739
022 D000005    696033
022 A000006 LEHMAN BROTHERS
022 B000006 13-2518466
022 C000006   1550892
022 D000006    132741
<PAGE>      PAGE  4
022 A000007 FORD MOTOR CREDIT
022 B000007 38-1612444
022 C000007   1551260
022 D000007      2224
022 A000008 AMERICAN EXPRESS CREDIT CORP.
022 B000008 11-1988350
022 C000008   1255968
022 D000008     32729
022 A000009 GENERAL ELECTRIC CREDIT CORP.
022 B000009 13-1500700
022 C000009   1221964
022 D000009     19418
022 A000010 DONALDSON & CO., INC.
022 B000010 58-1574040
022 C000010    322616
022 D000010    193076
023 C000000   18938877
023 D000000    5578956
026 A000000 N
026 B000000 Y
026 C000000 Y
026 D000000 Y
026 E000000 Y
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 Y
027  000000 Y
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078  000000 N
080 A00AA00 CONTINENTAL CASUALTY COMPANY
080 C00AA00     2500
081 A00AA00 Y
<PAGE>      PAGE  5
081 B00AA00  23
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
008 A000101 MACKAY SHIELDS LLC
008 B000101 S
008 C000101 801-5594
008 D010101 NEW YORK
008 D020101 NY
008 D030101 10019
008 A000102 MAINSTAY MANAGEMENT LLC
008 B000102 A
008 C000102 801-54912
008 D010102 PARSIPPANY
008 D020102 NJ
008 D030102 07054
024  000100 Y
025 A000101 GOLDMAN SACHS GROUP INC.
025 C000101 E
025 D000101   22605
025 A000102 ML PREMIERE INSTITUTIONAL FUND
025 C000102 E
025 D000102   51145
025 D000103       0
025 D000104       0
025 D000105       0
025 D000106       0
025 D000107       0
025 D000108       0
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028 A020100         0
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028 A040100    114439
028 B010100     92993
028 B020100         0
028 B030100         0
028 B040100     93194
028 C010100    113348
028 C020100         0
028 C030100         0
028 C040100     99256
028 D010100    107297
028 D020100         0
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028 D040100     89919
028 E010100    112698
<PAGE>      PAGE  6
028 E020100         0
028 E030100         0
028 E040100    132722
028 F010100    134155
028 F020100    241580
028 F030100         0
028 F040100    140352
028 G010100    675860
028 G020100    241580
028 G030100         0
028 G040100    669882
028 H000100     21050
029  000100 Y
030 A000100   1153
030 B000100  5.50
030 C000100  2.00
031 A000100     32
031 B000100      0
032  000100    356
033  000100    765
034  000100 Y
035  000100   3070
036 A000100 Y
036 B000100      0
037  000100 N
038  000100      0
040  000100 Y
041  000100 Y
042 A000100   0
042 B000100   0
042 C000100   0
042 D000100   0
042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
043  000100  31221
044  000100      0
055 A000100 N
055 B000100 N
056  000100 Y
057  000100 N
062 A000100 N
062 B000100   0.0
062 C000100   0.0
062 D000100   0.0
062 E000100   0.0
062 F000100   0.0
062 G000100   0.0
062 H000100   0.0
062 I000100   0.0
<PAGE>      PAGE  7
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   0.0
062 N000100   0.0
062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
063 A000100   0
063 B000100  0.0
066 A000100 Y
066 B000100 N
066 C000100 N
066 D000100 Y
066 E000100 N
066 F000100 N
066 G000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 N
070 A010100 Y
070 A020100 Y
070 B010100 Y
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 Y
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 Y
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
<PAGE>      PAGE  8
070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 Y
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100   1506515
071 B000100   1359209
071 C000100   3354703
071 D000100   41
072 A000100 12
072 B000100     5431
072 C000100    13092
072 D000100        0
072 E000100        0
072 F000100    12484
072 G000100    12484
072 H000100        0
072 I000100     5958
072 J000100      304
072 K000100        0
072 L000100      538
072 M000100      103
072 N000100      239
072 O000100        0
072 P000100        0
072 Q000100      373
072 R000100       48
072 S000100      151
072 T000100    31221
072 U000100        0
072 V000100        0
072 W000100      112
072 X000100    64015
072 Y000100     6739
072 Z000100   -38753
072AA000100   619236
072BB000100   116514
072CC010100   327050
072CC020100        0
072DD010100        0
072DD020100        0
072EE000100   250456
073 A010100   0.0000
073 A020100   0.0000
073 B000100   3.6044
073 C000100   0.0000
074 A000100        3
074 B000100        0
074 C000100    95615
<PAGE>      PAGE  9
074 D000100        0
074 E000100        0
074 F000100  4017918
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100    17699
074 K000100        0
074 L000100     6819
074 M000100        0
074 N000100  4138054
074 O000100    30907
074 P000100     4778
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100     5012
074 S000100        0
074 T000100  4097357
074 U010100    10288
074 U020100    63642
074 V010100    57.12
074 V020100    55.15
074 W000100   0.0000
074 X000100   284764
074 Y000100        0
075 A000100        0
075 B000100  3467905
076  000100     0.00
008 A000201 MACKAY SHIELDS LLC
008 B000201 S
008 C000201 801-5594
008 D010201 NEW YORK
008 D020201 NJ
008 D030201 10019
008 A000202 MAINSTAY MANAGEMENT LLC
008 B000202 A
008 C000202 801-54912
008 D010202 PARSIPPANY
008 D020202 NJ
008 D030202 07054
024  000200 Y
025 A000201 ML PREMIERE INSTITUTIONAL FUND
025 C000201 D
025 D000201   12745
025 D000202       0
025 D000203       0
025 D000204       0
025 D000205       0
025 D000206       0
<PAGE>      PAGE  10
025 D000207       0
025 D000208       0
028 A010200     14912
028 A020200       169
028 A030200         0
028 A040200     26461
028 B010200     14241
028 B020200         0
028 B030200         0
028 B040200     28889
028 C010200     11878
028 C020200         0
028 C030200         0
028 C040200     21281
028 D010200     14125
028 D020200         0
028 D030200         0
028 D040200     23894
028 E010200     10647
028 E020200         0
028 E030200         0
028 E040200     35812
028 F010200     22126
028 F020200     19352
028 F030200         0
028 F040200     52146
028 G010200     87929
028 G020200     19521
028 G030200         0
028 G040200    188483
028 H000200      4129
029  000200 Y
030 A000200    233
030 B000200  5.50
030 C000200  2.00
031 A000200      4
031 B000200      0
032  000200     58
033  000200    171
034  000200 Y
035  000200   1580
036 A000200 Y
036 B000200      0
037  000200 N
038  000200      0
040  000200 Y
041  000200 Y
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200   0
<PAGE>      PAGE  11
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200  11514
044  000200      0
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
062 A000200 N
062 B000200   0.0
062 C000200   0.0
062 D000200   0.0
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200   0.0
062 N000200   0.0
062 O000200   0.0
062 P000200   0.0
062 Q000200   0.0
062 R000200   0.0
063 A000200   0
063 B000200  0.0
066 A000200 Y
066 B000200 N
066 C000200 N
066 D000200 N
066 E000200 Y
066 F000200 N
066 G000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 N
070 A010200 Y
070 A020200 N
070 B010200 Y
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 N
070 E020200 N
<PAGE>      PAGE  12
070 F010200 Y
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 Y
070 K020200 Y
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200    736248
071 B000200    988173
071 C000200   1197656
071 D000200   61
072 A000200 12
072 B000200     1150
072 C000200    21449
072 D000200        0
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072 G000200     3538
072 H000200        0
072 I000200     3047
072 J000200      118
072 K000200        0
072 L000200      229
072 M000200       34
072 N000200       69
072 O000200        0
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072 Q000200      150
072 R000200       39
072 S000200       53
072 T000200    11514
072 U000200        0
<PAGE>      PAGE  13
072 V000200        0
072 W000200       44
072 X000200    22373
072 Y000200        0
072 Z000200      226
072AA000200   164320
072BB000200   159708
072CC010200    83690
072CC020200        0
072DD010200      442
072DD020200      756
072EE000200    19848
073 A010200   0.0723
073 A020200   0.0109
073 B000200   0.3210
073 C000200   0.0000
074 A000200        0
074 B000200        0
074 C000200    35023
074 D000200        0
074 E000200        0
074 F000200  1109041
074 G000200        0
074 H000200        0
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074 J000200     2934
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074 M000200        0
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074 O000200    15787
074 P000200     1455
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074 R040200     2155
074 S000200        0
074 T000200  1130434
074 U010200    62429
074 U020200       35
074 V010200    18.18
074 V020200    18.09
074 W000200   0.0000
074 X000200   132837
074 Y000200    16924
075 A000200        0
075 B000200  1237052
076  000200     0.00
008 A000301 MACKAY SHIELDS LLC
008 B000301 S
<PAGE>      PAGE  14
008 C000301 801-5594
008 D010301 NEW YORK
008 D020301 NY
008 D030301 10019
008 A000302 MAINSTAY MANAGEMENT LLC
008 B000302 A
008 C000302 801-54912
008 D010302 PARSIPPANY
008 D020302 NJ
008 D030302 07054
024  000300 Y
025 A000301 ML PREMIERE INSTITUTIONAL FUND
025 C000301 D
025 D000301   25211
025 A000302 MS DRUG
025 C000302 D
025 D000302    6111
025 A000303 EVEREST REINSURANCE HOLDINGS
025 C000303 D
025 D000303       0
025 A000304 SALOMON SMITH BARNEY HOLDINGS
025 C000304 D
025 D000304       0
025 D000305       0
025 D000306       0
025 D000307       0
025 D000308       0
028 A010300      2539
028 A020300      4986
028 A030300         0
028 A040300     13825
028 B010300      4172
028 B020300         0
028 B030300         0
028 B040300     12054
028 C010300      2839
028 C020300         0
028 C030300         0
028 C040300      9773
028 D010300      4057
028 D020300      4306
028 D030300         0
028 D040300      9872
028 E010300      4408
028 E020300     65752
028 E030300         0
028 E040300     11070
028 F010300      7654
028 F020300         0
028 F030300         0
028 F040300     13370
<PAGE>      PAGE  15
028 G010300     25670
028 G020300     75044
028 G030300         0
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028 H000300       879
029  000300 Y
030 A000300     50
030 B000300  5.50
030 C000300  2.00
031 A000300      1
031 B000300      0
032  000300     21
033  000300     28
034  000300 Y
035  000300   1337
036 A000300 Y
036 B000300      0
037  000300 N
038  000300      0
039  000300 N
040  000300 Y
041  000300 Y
042 A000300   0
042 B000300   0
042 C000300   0
042 D000300   0
042 E000300   0
042 F000300   0
042 G000300   0
042 H000300   0
043  000300   6239
044  000300      0
055 A000300 N
055 B000300 N
056  000300 Y
057  000300 N
062 A000300 Y
062 B000300   0.0
062 C000300   0.0
062 D000300   0.0
062 E000300   0.0
062 F000300   0.0
062 G000300   0.0
062 H000300   2.5
062 I000300   0.0
062 J000300   0.0
062 K000300   0.0
062 L000300  -0.1
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<PAGE>      PAGE  16
062 P000300   0.2
062 Q000300  41.8
062 R000300  55.6
063 A000300   0
063 B000300  6.5
064 A000300 N
064 B000300 Y
065  000300 N
066 A000300 Y
066 B000300 N
066 C000300 N
066 D000300 N
066 E000300 N
066 F000300 N
066 G000300 Y
067  000300 N
068 A000300 N
068 B000300 N
069  000300 N
070 A010300 Y
070 A020300 N
070 B010300 Y
070 B020300 Y
070 C010300 Y
070 C020300 N
070 D010300 Y
070 D020300 Y
070 E010300 Y
070 E020300 N
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 Y
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 Y
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 Y
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 N
<PAGE>      PAGE  17
070 Q010300 Y
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070 R010300 Y
070 R020300 Y
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072 J000300       50
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072 T000300     6239
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072 Y000300        0
072 Z000300    20514
072AA000300   258738
072BB000300   133516
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072DD010300    19406
072DD020300       10
072EE000300    67612
073 A010300   0.5190
073 A020300   0.4132
073 B000300   1.5376
073 C000300   1.5376
074 A000300       65
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074 D000300   297016
074 E000300   245474
074 F000300   121264
<PAGE>      PAGE  18
074 G000300        3
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074 U020300       91
074 V010300    14.53
074 V020300    14.53
074 W000300   0.0000
074 X000300    52257
074 Y000300        0
075 A000300        0
075 B000300   653742
076  000300     0.00
008 A000401 MACKAY SHIELDS LLC
008 B000401 S
008 C000401 801-5594
008 D010401 NEW YORK
008 D020401 NY
008 D030401 10019
008 A000402 MAINSTAY MANAGEMENT LLC
008 B000402 A
008 C000402 801-54912
008 D010402 PARSIPPANY
008 D020402 NJ
008 D030402 07054
024  000400 Y
025 A000401 ML PREMIERE INSTITUTIONAL FUND
025 C000401 D
025 D000401   41964
025 A000402 MORGAN STANLEY DEAN WITTER
025 C000402 D
025 D000402   30000
025 D000403       0
025 D000404       0
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025 D000406       0
025 D000407       0
<PAGE>      PAGE  19
025 D000408       0
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034  000400 Y
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036 A000400 Y
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038  000400      0
039  000400 N
040  000400 Y
041  000400 Y
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042 C000400   0
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<PAGE>      PAGE  20
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055 A000400 N
055 B000400 N
056  000400 Y
057  000400 N
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064 A000400 N
064 B000400 Y
065  000400 N
066 A000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 N
070 A010400 Y
070 A020400 Y
070 B010400 Y
070 B020400 Y
070 C010400 Y
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 Y
<PAGE>      PAGE  21
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
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070 J020400 Y
070 K010400 Y
070 K020400 Y
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
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070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 Y
070 Q020400 N
070 R010400 Y
070 R020400 N
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<PAGE>      PAGE  22
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008 A000501 MACKAY SHIELDS LLC
008 B000501 S
008 C000501 801-5594
008 D010501 NEW YORK
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<PAGE>      PAGE  23
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008 B000502 A
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008 D030502 07054
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025 A000501 LBCMT
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025 A000502 LBCMT
025 C000502 D
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025 A000503 ML PREMIERE INSTITUTIONAL FUND
025 C000503 D
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025 A000504 MSC
025 C000504 D
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<PAGE>      PAGE  24
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034  000500 Y
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038  000500      0
039  000500 N
040  000500 Y
041  000500 Y
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042 F000500   0
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042 H000500   0
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055 B000500 N
056  000500 Y
057  000500 N
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<PAGE>      PAGE  25
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063 B000500 10.1
066 A000500 N
067  000500 N
068 A000500 N
068 B000500 N
069  000500 N
070 A010500 Y
070 A020500 Y
070 B010500 N
070 B020500 N
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070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 Y
070 K020500 Y
070 L010500 N
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 Y
070 N020500 Y
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
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<PAGE>      PAGE  26
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<PAGE>      PAGE  27
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008 A000601 MACKAY SHIELDS LLC
008 B000601 S
008 C000601 801-5594
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008 D030601 10019
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008 D020602 NJ
008 D030602 07054
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025 A000601 SALOMON SMITH BARNEY
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025 A000602 JP MORGAN & CO.
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025 C000604 E
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<PAGE>      PAGE  28
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036 B000600      0
038  000600      0
039  000600 N
040  000600 N
041  000600 N
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<PAGE>      PAGE  29
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064 B000600 N
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067  000600 N
068 A000600 N
068 B000600 N
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070 C020600 N
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070 D020600 N
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070 E020600 N
070 F010600 N
070 F020600 N
070 G010600 N
070 G020600 N
070 H010600 N
070 H020600 N
<PAGE>      PAGE  30
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<PAGE>      PAGE  31
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008 A000701 MACKAY SHIELDS LLC
008 B000701 S
008 C000701 801-5594
008 D010701 NEW YORK
008 D020701 NY
008 D030701 10019
008 A000702 MAINSTAY MANAGEMENT LLC
008 B000702 A
<PAGE>      PAGE  32
008 C000702 801-54912
008 D010702 PARSIPPANY
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039  000700 N
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041  000700 Y
<PAGE>      PAGE  33
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068 A000700 N
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070 E020700 Y
<PAGE>      PAGE  34
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070 L010700 N
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<PAGE>      PAGE  35
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<PAGE>      PAGE  36
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008 A000901 MACKAY SHIELDS LLC
008 B000901 S
008 C000901 801-5594
008 D010901 NEW YORK
008 D020901 NY
008 D030901 10019
008 A000902 MAINSTAY MANAGEMENT LLC
008 B000902 A
008 C000902 801-54912
008 D010902 PARSIPPANY
008 D020902 NJ
008 D030902 07054
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025 A000901 ML PREMIERE INSTITUTIONAL FUND
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025 A000903 DLJ
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025 A000904 GOLDMAN SACHS GROUP
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<PAGE>      PAGE  37
025 A000909 ML PREMIERE INSTITUTIONAL FUND
025 C000909 D
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<PAGE>      PAGE  38
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<PAGE>      PAGE  39
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066 E000900 N
066 F000900 N
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070 I020900 N
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<PAGE>      PAGE  40
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<PAGE>      PAGE  41
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008 A001101 MONITOR CAPITAL ADVISORS LLC
008 B001101 S
008 C001101 801-34412
008 D011101 PRINCETON
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008 D031101 08540
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008 D011102 PARSIPPANY
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008 D031102 07054
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<PAGE>      PAGE  42
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037  001100 N
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039  001100 N
040  001100 Y
041  001100 Y
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<PAGE>      PAGE  43
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070 B021100 N
070 C011100 N
070 C021100 N
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070 D021100 N
070 E011100 N
070 E021100 N
<PAGE>      PAGE  44
070 F011100 Y
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070 K011100 N
070 K021100 N
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<PAGE>      PAGE  45
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008 A001201 MACKAY SHIELDS LLC
008 B001201 S
<PAGE>      PAGE  46
008 C001201 801-5594
008 D011201 NEW YORK
008 D021201 NY
008 D031201 10019
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<PAGE>      PAGE  47
037  001200 N
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039  001200 N
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041  001200 Y
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067  001200 N
068 A001200 N
068 B001200 N
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070 A011200 Y
070 A021200 N
070 B011200 N
070 B021200 N
070 C011200 N
<PAGE>      PAGE  48
070 C021200 N
070 D011200 N
070 D021200 N
070 E011200 Y
070 E021200 Y
070 F011200 N
070 F021200 N
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070 G021200 N
070 H011200 N
070 H021200 N
070 I011200 N
070 I021200 N
070 J011200 Y
070 J021200 N
070 K011200 N
070 K021200 N
070 L011200 N
070 L021200 N
070 M011200 N
070 M021200 N
070 N011200 N
070 N021200 N
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070 O021200 N
070 P011200 Y
070 P021200 N
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070 Q021200 N
070 R011200 N
070 R021200 N
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<PAGE>      PAGE  49
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<PAGE>      PAGE  50
075 A001200        0
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008 A001301 MACKAY SHIELDS LLC
008 B001301 S
008 C001301 801-5594
008 D011301 NEW YORK
008 D021301 NY
008 D031301 10019
008 A001302 MAINSTAY MANAGEMENT LLC
008 B001302 A
008 C001302 801-54912
008 D011302 PARSIPPANY
008 D021302 NJ
008 D031302 07054
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<PAGE>      PAGE  51
033  001300      8
034  001300 Y
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039  001300 N
040  001300 Y
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064 A001300 Y
064 B001300 N
066 A001300 N
067  001300 N
068 A001300 N
068 B001300 N
069  001300 N
<PAGE>      PAGE  52
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070 B021300 N
070 C011300 N
070 C021300 N
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070 D021300 N
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070 E021300 Y
070 F011300 N
070 F021300 N
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070 G021300 N
070 H011300 N
070 H021300 N
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 N
070 K011300 N
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
070 O011300 Y
070 O021300 N
070 P011300 Y
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070 Q021300 N
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<PAGE>      PAGE  53
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<PAGE>      PAGE  54
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008 A001401 MACKAY SHIELDS LLC
008 B001401 S
008 C001401 801-5594
008 D011401 NEW YORK
008 D021401 NY
008 D031401 10019
008 A001402 MAINSTAY MANAGEMENT LLC
008 B001402 A
008 C001402 801-54912
008 D011402 PARSIPPANY
008 D021402 NJ
008 D031402 07054
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<PAGE>      PAGE  55
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039  001400 N
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056  001400 Y
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<PAGE>      PAGE  56
066 A001400 N
067  001400 N
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<PAGE>      PAGE  57
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<PAGE>      PAGE  58
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<PAGE>      PAGE  59
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<PAGE>      PAGE  60
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066 F001500 N
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<PAGE>      PAGE  61
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<PAGE>      PAGE  62
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008 B001601 S
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<PAGE>      PAGE  63
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<PAGE>      PAGE  64
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<PAGE>      PAGE  65
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<PAGE>      PAGE  66
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<PAGE>      PAGE  67
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<PAGE>      PAGE  68
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<PAGE>      PAGE  69
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066 C001700 N
066 D001700 N
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<PAGE>      PAGE  70
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<PAGE>      PAGE  71
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008 A001801 MACKAY SHIELDS LLC
008 B001801 A
008 C001801 801-5594
008 D011801 NEW YORK
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008 D031801 10019
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<PAGE>      PAGE  72
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053 A001800 N
<PAGE>      PAGE  73
055 A001800 N
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066 E001800 N
066 F001800 N
066 G001800 N
067  001800 N
068 A001800 N
068 B001800 N
069  001800 N
070 A011800 Y
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070 B011800 Y
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070 E021800 N
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070 F021800 N
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070 G021800 N
070 H011800 Y
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<PAGE>      PAGE  74
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070 O021800 N
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070 Q021800 N
070 R011800 Y
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<PAGE>      PAGE  93
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030 B002300  5.50
030 C002300  2.00
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036 A002300 Y
036 B002300      0
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038  002300      0
039  002300 N
040  002300 Y
041  002300 Y
042 A002300   0
<PAGE>      PAGE  94
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042 C002300   0
042 D002300   0
042 E002300   0
042 F002300   0
042 G002300   0
042 H002300   0
043  002300    110
044  002300      0
055 A002300 N
055 B002300 N
056  002300 Y
057  002300 N
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062 D002300   0.0
062 E002300   0.0
062 F002300   0.0
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062 H002300   0.0
062 I002300   0.0
062 J002300   0.0
062 K002300   0.0
062 L002300   0.0
062 M002300   0.0
062 N002300   0.0
062 O002300   0.0
062 P002300   0.0
062 Q002300   0.0
062 R002300   0.0
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063 B002300  0.0
066 A002300 Y
066 B002300 N
066 C002300 Y
066 D002300 N
066 E002300 N
066 F002300 N
066 G002300 N
067  002300 N
068 A002300 N
068 B002300 N
069  002300 N
070 A012300 Y
070 A022300 N
070 B012300 Y
070 B022300 N
070 C012300 N
070 C022300 N
070 D012300 Y
<PAGE>      PAGE  95
070 D022300 N
070 E012300 N
070 E022300 N
070 F012300 Y
070 F022300 N
070 G012300 N
070 G022300 N
070 H012300 Y
070 H022300 N
070 I012300 N
070 I022300 N
070 J012300 Y
070 J022300 N
070 K012300 Y
070 K022300 N
070 L012300 Y
070 L022300 Y
070 M012300 Y
070 M022300 N
070 N012300 N
070 N022300 N
070 O012300 N
070 O022300 N
070 P012300 N
070 P022300 N
070 Q012300 N
070 Q022300 N
070 R012300 N
070 R022300 N
071 A002300     19489
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072 E002300        0
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072 J002300       18
072 K002300        0
072 L002300       25
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072 N002300       33
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072 R002300       22
<PAGE>      PAGE  96
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072 Y002300       68
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072DD022300        0
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074 H002300        0
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074 J002300        0
074 K002300        0
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<PAGE>      PAGE  97
076  002300     0.00
008 A002401 MACKAY SHIELDS LLC
008 B002401 S
008 C002401 801-5594
008 D012401 PARSIPPANY
008 D022401 NJ
008 D032401 07054
008 A002402 MAINSTAY MANAGEMENT LLC
008 B002402 A
008 C002402 801-54912
008 D012402 PARSIPPANY
008 D022402 NJ
008 D032402 07054
024  002400 N
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<PAGE>      PAGE  98
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041  002400 Y
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042 D002400   0
042 E002400   0
042 F002400   0
042 G002400   0
042 H002400   0
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055 B002400 N
056  002400 Y
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062 H002400   0.0
062 I002400   2.3
062 J002400   0.0
062 K002400   0.0
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062 N002400   0.0
062 O002400   0.0
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066 A002400 N
067  002400 N
068 A002400 N
068 B002400 Y
069  002400 N
070 A012400 Y
070 A022400 N
070 B012400 Y
<PAGE>      PAGE  99
070 B022400 N
070 C012400 Y
070 C022400 N
070 D012400 Y
070 D022400 N
070 E012400 N
070 E022400 N
070 F012400 Y
070 F022400 N
070 G012400 Y
070 G022400 N
070 H012400 Y
070 H022400 N
070 I012400 Y
070 I022400 N
070 J012400 Y
070 J022400 N
070 K012400 Y
070 K022400 N
070 L012400 Y
070 L022400 Y
070 M012400 Y
070 M022400 Y
070 N012400 Y
070 N022400 N
070 O012400 Y
070 O022400 N
070 P012400 Y
070 P022400 N
070 Q012400 Y
070 Q022400 N
070 R012400 Y
070 R022400 N
071 A002400     11856
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072 J002400       21
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<PAGE>      PAGE  100
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072 R002400       23
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072 U002400       14
072 V002400        0
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072 X002400      323
072 Y002400      116
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072BB002400      892
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072CC022400        0
072DD012400     1026
072DD022400        4
072EE002400        0
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073 A022400   0.7238
073 B002400   0.0000
073 C002400   0.0000
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074 D002400    11767
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<PAGE>      PAGE  101
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008 D032501 10606
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008 B002502 A
008 C002502 801-54912
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008 D032502 07054
024  002500 N
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<PAGE>      PAGE  102
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040  002500 Y
041  002500 Y
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042 B002500   0
042 C002500   0
042 D002500   0
042 E002500   0
042 F002500   0
042 G002500   0
042 H002500   0
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044  002500      0
055 A002500 N
055 B002500 N
056  002500 Y
057  002500 N
058 A002500 N
059  002500 Y
060 A002500 Y
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062 J002500   0.0
062 K002500   0.0
062 L002500   0.0
062 M002500   0.0
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062 P002500   0.0
062 Q002500   0.0
062 R002500   0.0
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063 B002500  0.0
<PAGE>      PAGE  103
066 A002500 Y
066 B002500 N
066 C002500 N
066 D002500 N
066 E002500 Y
066 F002500 N
066 G002500 N
067  002500 N
068 A002500 N
068 B002500 N
069  002500 N
070 A012500 N
070 A022500 N
070 B012500 N
070 B022500 N
070 C012500 N
070 C022500 N
070 D012500 N
070 D022500 N
070 E012500 N
070 E022500 N
070 F012500 N
070 F022500 N
070 G012500 N
070 G022500 N
070 H012500 N
070 H022500 N
070 I012500 N
070 I022500 N
070 J012500 N
070 J022500 N
070 K012500 N
070 K022500 N
070 L012500 Y
070 L022500 Y
070 M012500 N
070 M022500 N
070 N012500 N
070 N022500 N
070 O012500 N
070 O022500 N
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070 P022500 N
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070 Q022500 N
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070 R022500 N
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<PAGE>      PAGE  104
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<PAGE>      PAGE  105
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SIGNATURE   CYNTHIA BAUGHMAN
TITLE       ATTORNEY


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 101
   <NAME> MAINSTAY CAPITAL APPRECIATION FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
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<EXPENSE-RATIO>                                  1.000


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 101
   <NAME> MAINSTAY CAPITAL APPRECIATION FUND - CLASS B
<MULTIPLIER> 1

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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 101
   <NAME> MAINSTAY CAPITAL APPRECIATION FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<EQUALIZATION>                                       0
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<DISTRIBUTIONS-OF-GAINS>                   (1,404,342)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        412,526
<NUMBER-OF-SHARES-REDEEMED>                   (43,396)
<SHARES-REINVESTED>                             18,565
<NET-CHANGE-IN-ASSETS>                     947,896,932
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                   11,276,738
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       12,484,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             64,015,000
<AVERAGE-NET-ASSETS>                     3,467,905,000
<PER-SHARE-NAV-BEGIN>                           47.540
<PER-SHARE-NII>                                (0.610)
<PER-SHARE-GAIN-APPREC>                         11.820
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                      (3.600)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                             55.150
<EXPENSE-RATIO>                                  1.750


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 2
   <NAME> MAINSTAY VALUE FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,080,187,719
<INVESTMENTS-AT-VALUE>                   1,144,063,933
<RECEIVABLES>                                5,766,089
<ASSETS-OTHER>                                     481
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,149,830,503
<PAYABLE-FOR-SECURITIES>                    15,787,321
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,609,130
<TOTAL-LIABILITIES>                         19,396,451
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,074,990,014
<SHARES-COMMON-STOCK>                        6,438,150
<SHARES-COMMON-PRIOR>                        6,697,933
<ACCUMULATED-NII-CURRENT>                          381
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (8,272,255)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    63,715,912
<NET-ASSETS>                             1,130,434,052
<DIVIDEND-INCOME>                           21,449,312
<INTEREST-INCOME>                            1,150,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (22,372,857)
<NET-INVESTMENT-INCOME>                        226,461
<REALIZED-GAINS-CURRENT>                     4,611,907
<APPREC-INCREASE-CURRENT>                   83,690,086
<NET-CHANGE-FROM-OPS>                       88,528,454
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (18,103)
<DISTRIBUTIONS-OF-GAINS>                   (1,818,124)
<DISTRIBUTIONS-OTHER>                        (423,642)
<NUMBER-OF-SHARES-SOLD>                      6,437,285
<NUMBER-OF-SHARES-REDEEMED>                (6,820,975)
<SHARES-REINVESTED>                            123,907
<NET-CHANGE-IN-ASSETS>                   (159,125,115)
<ACCUMULATED-NII-PRIOR>                         35,686
<ACCUMULATED-GAINS-PRIOR>                    6,021,443
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,538,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             22,373,000
<AVERAGE-NET-ASSETS>                     1,237,052,000
<PER-SHARE-NAV-BEGIN>                           17.160
<PER-SHARE-NII>                                  0.120
<PER-SHARE-GAIN-APPREC>                          1.290
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.320)
<RETURNS-OF-CAPITAL>                           (0.070)
<PER-SHARE-NAV-END>                             18.180
<EXPENSE-RATIO>                                  1.130


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 2
   <NAME> MAINSTAY VALUE FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,080,187,719
<INVESTMENTS-AT-VALUE>                   1,144,063,933
<RECEIVABLES>                                5,766,089
<ASSETS-OTHER>                                     481
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,149,830,503
<PAYABLE-FOR-SECURITIES>                    15,787,321
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,609,130
<TOTAL-LIABILITIES>                         19,396,451
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,074,990,014
<SHARES-COMMON-STOCK>                       55,990,014
<SHARES-COMMON-PRIOR>                       68,477,265
<ACCUMULATED-NII-CURRENT>                          381
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (8,272,255)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    63,715,912
<NET-ASSETS>                             1,130,434,052
<DIVIDEND-INCOME>                           21,449,312
<INTEREST-INCOME>                            1,150,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (22,372,857)
<NET-INVESTMENT-INCOME>                        226,461
<REALIZED-GAINS-CURRENT>                     4,611,907
<APPREC-INCREASE-CURRENT>                   83,690,086
<NET-CHANGE-FROM-OPS>                       88,528,454
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (28,348)
<DISTRIBUTIONS-OF-GAINS>                  (18,018,715)
<DISTRIBUTIONS-OTHER>                        (663,472)
<NUMBER-OF-SHARES-SOLD>                      6,641,235
<NUMBER-OF-SHARES-REDEEMED>               (20,185,324)
<SHARES-REINVESTED>                          1,057,468
<NET-CHANGE-IN-ASSETS>                   (159,125,115)
<ACCUMULATED-NII-PRIOR>                         35,686
<ACCUMULATED-GAINS-PRIOR>                    6,021,443
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,538,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             22,373,000
<AVERAGE-NET-ASSETS>                     1,237,052,000
<PER-SHARE-NAV-BEGIN>                           17.150
<PER-SHARE-NII>                                (0.010)
<PER-SHARE-GAIN-APPREC>                          1.280
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.320)
<RETURNS-OF-CAPITAL>                           (0.010)
<PER-SHARE-NAV-END>                             18.090
<EXPENSE-RATIO>                                  1.880


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 2
   <NAME> MAINSTAY VALUE FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,080,187,719
<INVESTMENTS-AT-VALUE>                   1,144,063,933
<RECEIVABLES>                                5,766,089
<ASSETS-OTHER>                                     481
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           1,149,830,503
<PAYABLE-FOR-SECURITIES>                    15,787,321
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,609,130
<TOTAL-LIABILITIES>                         19,396,451
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,074,990,014
<SHARES-COMMON-STOCK>                           34,894
<SHARES-COMMON-PRIOR>                            4,677
<ACCUMULATED-NII-CURRENT>                          381
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (8,272,255)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    63,715,912
<NET-ASSETS>                             1,130,434,052
<DIVIDEND-INCOME>                           21,449,312
<INTEREST-INCOME>                            1,150,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (22,372,857)
<NET-INVESTMENT-INCOME>                        226,461
<REALIZED-GAINS-CURRENT>                     4,611,907
<APPREC-INCREASE-CURRENT>                   83,690,086
<NET-CHANGE-FROM-OPS>                       88,528,454
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          (3)
<DISTRIBUTIONS-OF-GAINS>                      (11,236)
<DISTRIBUTIONS-OTHER>                             (61)
<NUMBER-OF-SHARES-SOLD>                         43,781
<NUMBER-OF-SHARES-REDEEMED>                   (13,148)
<SHARES-REINVESTED>                                584
<NET-CHANGE-IN-ASSETS>                   (159,125,115)
<ACCUMULATED-NII-PRIOR>                         35,686
<ACCUMULATED-GAINS-PRIOR>                    6,021,443
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,538,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             22,373,000
<AVERAGE-NET-ASSETS>                     1,237,052,000
<PER-SHARE-NAV-BEGIN>                           17.150
<PER-SHARE-NII>                                (0.010)
<PER-SHARE-GAIN-APPREC>                          1.280
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.320)
<RETURNS-OF-CAPITAL>                           (0.010)
<PER-SHARE-NAV-END>                             18.090
<EXPENSE-RATIO>                                  1.880


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 3
   <NAME> MAINSTAY CONVERTIBLE FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      694,081,003
<INVESTMENTS-AT-VALUE>                     706,629,424
<RECEIVABLES>                                6,124,395
<ASSETS-OTHER>                                 527,331
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             713,281,150
<PAYABLE-FOR-SECURITIES>                     4,672,225
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,829,653
<TOTAL-LIABILITIES>                          7,501,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,687,409
<SHARES-COMMON-STOCK>                        3,183,580
<SHARES-COMMON-PRIOR>                        3,392,907
<ACCUMULATED-NII-CURRENT>                      875,955
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     43,153,551
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    12,062,357
<NET-ASSETS>                               705,779,272
<DIVIDEND-INCOME>                           16,376,844
<INTEREST-INCOME>                           17,194,308
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (13,057,451)
<NET-INVESTMENT-INCOME>                     20,513,701
<REALIZED-GAINS-CURRENT>                   125,222,461
<APPREC-INCREASE-CURRENT>                   42,693,616
<NET-CHANGE-FROM-OPS>                      188,429,778
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (1,474,632)
<DISTRIBUTIONS-OF-GAINS>                   (4,372,928)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        598,332
<NUMBER-OF-SHARES-REDEEMED>                (1,203,469)
<SHARES-REINVESTED>                            395,810
<NET-CHANGE-IN-ASSETS>                     180,347,443
<ACCUMULATED-NII-PRIOR>                        259,745
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                (15,393,897)
<GROSS-ADVISORY-FEES>                        2,353,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             13,057,000
<AVERAGE-NET-ASSETS>                       653,742,000
<PER-SHARE-NAV-BEGIN>                           12.490
<PER-SHARE-NII>                                  0.550
<PER-SHARE-GAIN-APPREC>                          3.550
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.520)
<RETURNS-OF-CAPITAL>                           (1.540)
<PER-SHARE-NAV-END>                             14.530
<EXPENSE-RATIO>                                  1.280


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 3
   <NAME> MAINSTAY CONVERTIBLE FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      694,081,003
<INVESTMENTS-AT-VALUE>                     706,629,424
<RECEIVABLES>                                6,124,395
<ASSETS-OTHER>                                 527,331
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             713,281,150
<PAYABLE-FOR-SECURITIES>                     4,672,225
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,829,653
<TOTAL-LIABILITIES>                          7,501,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,687,409
<SHARES-COMMON-STOCK>                       45,291,769
<SHARES-COMMON-PRIOR>                       52,580,673
<ACCUMULATED-NII-CURRENT>                      875,955
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     43,153,551
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    12,062,357
<NET-ASSETS>                               705,779,272
<DIVIDEND-INCOME>                           16,376,844
<INTEREST-INCOME>                           17,194,308
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (13,057,451)
<NET-INVESTMENT-INCOME>                     20,513,701
<REALIZED-GAINS-CURRENT>                   125,222,461
<APPREC-INCREASE-CURRENT>                   42,693,616
<NET-CHANGE-FROM-OPS>                      188,429,778
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (17,931,053)
<DISTRIBUTIONS-OF-GAINS>                  (63,118,328)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,193,043
<NUMBER-OF-SHARES-REDEEMED>               (14,752,565)
<SHARES-REINVESTED>                          5,270,618
<NET-CHANGE-IN-ASSETS>                      13,512,849
<ACCUMULATED-NII-PRIOR>                        259,745
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                (15,393,897)
<GROSS-ADVISORY-FEES>                        2,353,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             13,057,000
<AVERAGE-NET-ASSETS>                       653,742,000
<PER-SHARE-NAV-BEGIN>                            12.49
<PER-SHARE-NII>                                   0.44
<PER-SHARE-GAIN-APPREC>                           3.55
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                       (0.41)
<RETURNS-OF-CAPITAL>                            (1.54)
<PER-SHARE-NAV-END>                              14.53
<EXPENSE-RATIO>                                   2.03


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 3
   <NAME> NAINSTAY CONVERITBLE FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      694,081,003
<INVESTMENTS-AT-VALUE>                     706,629,424
<RECEIVABLES>                                6,124,395
<ASSETS-OTHER>                                 527,331
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             713,281,150
<PAYABLE-FOR-SECURITIES>                     4,672,225
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,829,653
<TOTAL-LIABILITIES>                          7,501,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,687,409
<SHARES-COMMON-STOCK>                           91,459
<SHARES-COMMON-PRIOR>                               32
<ACCUMULATED-NII-CURRENT>                      875,955
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     43,153,551
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    12,062,357
<NET-ASSETS>                               705,779,272
<DIVIDEND-INCOME>                           16,376,844
<INTEREST-INCOME>                           17,194,308
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (13,057,451)
<NET-INVESTMENT-INCOME>                     20,513,701
<REALIZED-GAINS-CURRENT>                   125,222,461
<APPREC-INCREASE-CURRENT>                   42,693,616
<NET-CHANGE-FROM-OPS>                      188,429,778
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (9,726)
<DISTRIBUTIONS-OF-GAINS>                     (121,115)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         87,704
<NUMBER-OF-SHARES-REDEEMED>                    (4,636)
<SHARES-REINVESTED>                              8,359
<NET-CHANGE-IN-ASSETS>                     189,571,342
<ACCUMULATED-NII-PRIOR>                        259,745
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                (15,393,897)
<GROSS-ADVISORY-FEES>                        2,353,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             13,057,000
<AVERAGE-NET-ASSETS>                       653,742,000
<PER-SHARE-NAV-BEGIN>                            12.49
<PER-SHARE-NII>                                   0.44
<PER-SHARE-GAIN-APPREC>                           3.55
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                       (0.41)
<RETURNS-OF-CAPITAL>                            (1.54)
<PER-SHARE-NAV-END>                              14.53
<EXPENSE-RATIO>                                   2.03


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 4
   <NAME> MAINSTAY HIGH YIELD CORPORATE BOND FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    3,976,356,347
<INVESTMENTS-AT-VALUE>                   3,650,067,831
<RECEIVABLES>                               88,095,128
<ASSETS-OTHER>                                  50,056
<OTHER-ITEMS-ASSETS>                         6,549,097
<TOTAL-ASSETS>                           3,744,762,112
<PAYABLE-FOR-SECURITIES>                       364,444
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    13514,889
<TOTAL-LIABILITIES>                         13,879,333
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 4,055,687,703
<SHARES-COMMON-STOCK>                       49,809,757
<SHARES-COMMON-PRIOR>                       36,873,889
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                    (20,915,791)
<ACCUMULATED-NET-GAINS>                     17,718,213
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                 (321,607,346)
<NET-ASSETS>                             3,730,882,779
<DIVIDEND-INCOME>                           25,846,933
<INTEREST-INCOME>                          396,524,369
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                       0
<NET-INVESTMENT-INCOME>                   (62,598,510)
<REALIZED-GAINS-CURRENT>                   359,772,792
<APPREC-INCREASE-CURRENT>                   78,482,350
<NET-CHANGE-FROM-OPS>                     (99,218,365)
<EQUALIZATION>                             339,036,777
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                  (36,460,859)
<DISTRIBUTIONS-OTHER>                      (1,561,674)
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                 35,865,018
<SHARES-REINVESTED>                       (26,457,259)
<NET-CHANGE-IN-ASSETS>                       3,528,109
<ACCUMULATED-NII-PRIOR>                    398,845,514
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (3,671,347)
<GROSS-ADVISORY-FEES>                     (33,785,597)
<INTEREST-EXPENSE>                          11,155,000
<GROSS-EXPENSE>                                      0
<AVERAGE-NET-ASSETS>                        64,208,000
<PER-SHARE-NAV-BEGIN>                    3,718,295,000
<PER-SHARE-NII>                                  7.540
<PER-SHARE-GAIN-APPREC>                          0.790
<PER-SHARE-DIVIDEND>                           (0.040)
<PER-SHARE-DISTRIBUTIONS>                      (0.850)
<RETURNS-OF-CAPITAL>                           (0.030)
<PER-SHARE-NAV-END>                              0.000
<EXPENSE-RATIO>                                  7.410


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 4
   <NAME> THE MAINSTAY FUNDS
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    3,976,356,347
<INVESTMENTS-AT-VALUE>                   3,650,067,831
<RECEIVABLES>                               88,095,128
<ASSETS-OTHER>                                  50,056
<OTHER-ITEMS-ASSETS>                         6,549,097
<TOTAL-ASSETS>                           3,744,762,112
<PAYABLE-FOR-SECURITIES>                       364,444
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   13,514,889
<TOTAL-LIABILITIES>                         13,879,333
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 4,055,687,703
<SHARES-COMMON-STOCK>                      445,069,175
<SHARES-COMMON-PRIOR>                      439,389,326
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                    (20,915,791)
<ACCUMULATED-NET-GAINS>                     17,718,213
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                 (321,607,346)
<NET-ASSETS>                             3,730,882,779
<DIVIDEND-INCOME>                           25,846,933
<INTEREST-INCOME>                          396,524,369
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (62,598,510)
<NET-INVESTMENT-INCOME>                    359,772,792
<REALIZED-GAINS-CURRENT>                    78,482,350
<APPREC-INCREASE-CURRENT>                 (99,218,365)
<NET-CHANGE-FROM-OPS>                      339,036,777
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                (347,058,986)
<DISTRIBUTIONS-OF-GAINS>                  (14,116,121)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     74,195,087
<NUMBER-OF-SHARES-REDEEMED>               (99,743,339)
<SHARES-REINVESTED>                         31,228,101
<NET-CHANGE-IN-ASSETS>                      19,158,893
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                    (3,671,347)
<OVERDIST-NET-GAINS-PRIOR>                (33,785,597)
<GROSS-ADVISORY-FEES>                       11,155,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             64,208,000
<AVERAGE-NET-ASSETS>                     3,718,295,000
<PER-SHARE-NAV-BEGIN>                            7.530
<PER-SHARE-NII>                                  0.730
<PER-SHARE-GAIN-APPREC>                        (0.040)
<PER-SHARE-DIVIDEND>                           (0.790)
<PER-SHARE-DISTRIBUTIONS>                      (0.030)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              7.400
<EXPENSE-RATIO>                                  1.750


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 4
   <NAME> MAINSTAY HIGH YIELD CORPORATE BOND FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    3,976,356,347
<INVESTMENTS-AT-VALUE>                   3,650,067,831
<RECEIVABLES>                               88,095,128
<ASSETS-OTHER>                                  50,056
<OTHER-ITEMS-ASSETS>                         6,549,097
<TOTAL-ASSETS>                           3,744,762,112
<PAYABLE-FOR-SECURITIES>                       364,444
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   13,514,889
<TOTAL-LIABILITIES>                         13,879,333
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 4,055,687,703
<SHARES-COMMON-STOCK>                       67,180,695
<SHARES-COMMON-PRIOR>                        1,330,953
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                    (20,915,791)
<ACCUMULATED-NET-GAINS>                     17,718,213
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                 (321,607,346)
<NET-ASSETS>                             3,730,882,779
<DIVIDEND-INCOME>                           25,846,933
<INTEREST-INCOME>                          396,524,369
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (62,598,510)
<NET-INVESTMENT-INCOME>                    359,772,792
<REALIZED-GAINS-CURRENT>                    78,482,350
<APPREC-INCREASE-CURRENT>                 (99,218,365)
<NET-CHANGE-FROM-OPS>                      339,036,777
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (4,500,316)
<DISTRIBUTIONS-OF-GAINS>                     (277,698)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      9,208,606
<NUMBER-OF-SHARES-REDEEMED>                (1,791,166)
<SHARES-REINVESTED>                            327,424
<NET-CHANGE-IN-ASSETS>                     393,357,522
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                    (3,671,347)
<OVERDIST-NET-GAINS-PRIOR>                (33,785,597)
<GROSS-ADVISORY-FEES>                       11,155,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             64,208,000
<AVERAGE-NET-ASSETS>                     3,718,295,000
<PER-SHARE-NAV-BEGIN>                            7.530
<PER-SHARE-NII>                                  0.730
<PER-SHARE-GAIN-APPREC>                        (0.040)
<PER-SHARE-DIVIDEND>                           (0.790)
<PER-SHARE-DISTRIBUTIONS>                      (0.030)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              7.400
<EXPENSE-RATIO>                                  1.750


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY GOVERNMENT FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      553,838,279
<INVESTMENTS-AT-VALUE>                     539,152,309
<RECEIVABLES>                                5,599,493
<ASSETS-OTHER>                                  64,536
<OTHER-ITEMS-ASSETS>                       165,608,025
<TOTAL-ASSETS>                             710,424,363
<PAYABLE-FOR-SECURITIES>                    25,013,334
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  167,267,981
<TOTAL-LIABILITIES>                        192,281,315
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   669,759,299
<SHARES-COMMON-STOCK>                        4,403,641
<SHARES-COMMON-PRIOR>                        2,623,604
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                 (136,930,281)
<ACCUM-APPREC-OR-DEPREC>                  (14,685,970)
<NET-ASSETS>                               518,143,048
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           35,982,449
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (10,521,169)
<NET-INVESTMENT-INCOME>                     25,461,280
<REALIZED-GAINS-CURRENT>                  (29,290,292)
<APPREC-INCREASE-CURRENT>                 (16,969,853)
<NET-CHANGE-FROM-OPS>                     (20,798,865)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (1,500,555)
<DISTRIBUTIONS-OF-GAINS>                     (200,587)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      5,539,987
<NUMBER-OF-SHARES-REDEEMED>                (3,938,243)
<SHARES-REINVESTED>                            178,293
<NET-CHANGE-IN-ASSETS>                     (8,064,647)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>               (107,280,524)
<GROSS-ADVISORY-FEES>                        1,715,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             10,521,000
<AVERAGE-NET-ASSETS>                        28,111,000
<PER-SHARE-NAV-BEGIN>                            8.460
<PER-SHARE-NII>                                  0.480
<PER-SHARE-GAIN-APPREC>                        (0.710)
<PER-SHARE-DIVIDEND>                           (0.480)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              7.750
<EXPENSE-RATIO>                                  1.130


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY GOVERNMENT FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      553,838,279
<INVESTMENTS-AT-VALUE>                     539,152,309
<RECEIVABLES>                                5,599,493
<ASSETS-OTHER>                                  64,536
<OTHER-ITEMS-ASSETS>                       165,608,025
<TOTAL-ASSETS>                             710,424,363
<PAYABLE-FOR-SECURITIES>                    25,013,334
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  167,267,981
<TOTAL-LIABILITIES>                        192,281,315
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   669,759,299
<SHARES-COMMON-STOCK>                       67,869,603
<SHARES-COMMON-PRIOR>                       69,985,649
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                 (136,930,281)
<ACCUM-APPREC-OR-DEPREC>                  (14,685,970)
<NET-ASSETS>                               518,143,048
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           35,982,449
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (10,521,169)
<NET-INVESTMENT-INCOME>                     25,461,280
<REALIZED-GAINS-CURRENT>                  (29,290,292)
<APPREC-INCREASE-CURRENT>                 (16,969,853)
<NET-CHANGE-FROM-OPS>                     (20,798,865)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (24,305,589)
<DISTRIBUTIONS-OF-GAINS>                   (3,249,055)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      8,457,561
<NUMBER-OF-SHARES-REDEEMED>               (18,629,145)
<SHARES-REINVESTED>                          2,695,785
<NET-CHANGE-IN-ASSETS>                     107,911,172
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>               (107,280,524)
<GROSS-ADVISORY-FEES>                        1,715,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             10,521,000
<AVERAGE-NET-ASSETS>                       543,288,000
<PER-SHARE-NAV-BEGIN>                            8.440
<PER-SHARE-NII>                                  0.410
<PER-SHARE-GAIN-APPREC>                        (0.710)
<PER-SHARE-DIVIDEND>                           (0.410)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              7.730
<EXPENSE-RATIO>                                  1.880


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY GOVERNMENT FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      553,838,279
<INVESTMENTS-AT-VALUE>                     539,152,309
<RECEIVABLES>                                5,599,493
<ASSETS-OTHER>                                  64,536
<OTHER-ITEMS-ASSETS>                       165,608,025
<TOTAL-ASSETS>                             710,424,363
<PAYABLE-FOR-SECURITIES>                    25,013,334
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  167,267,981
<TOTAL-LIABILITIES>                        192,281,315
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   669,759,299
<SHARES-COMMON-STOCK>                           25,832
<SHARES-COMMON-PRIOR>                           11,194
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                 (136,930,281)
<ACCUM-APPREC-OR-DEPREC>                  (14,685,970)
<NET-ASSETS>                               518,143,048
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           35,982,449
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (10,521,169)
<NET-INVESTMENT-INCOME>                     25,461,280
<REALIZED-GAINS-CURRENT>                  (29,290,292)
<APPREC-INCREASE-CURRENT>                 (16,969,853)
<NET-CHANGE-FROM-OPS>                     (20,798,865)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (14,601)
<DISTRIBUTIONS-OF-GAINS>                       (1,952)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         84,358
<NUMBER-OF-SHARES-REDEEMED>                   (28,119)
<SHARES-REINVESTED>                            178,293
<NET-CHANGE-IN-ASSETS>                    (20,355,074)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>               (107,280,524)
<GROSS-ADVISORY-FEES>                        1,715,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             10,521,000
<AVERAGE-NET-ASSETS>                           292,000
<PER-SHARE-NAV-BEGIN>                            8.440
<PER-SHARE-NII>                                  0.410
<PER-SHARE-GAIN-APPREC>                        (0.710)
<PER-SHARE-DIVIDEND>                           (0.410)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              7.730
<EXPENSE-RATIO>                                  1.880


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 6
   <NAME> MAINSTAY MONEY MARKET FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      647,755,325
<INVESTMENTS-AT-VALUE>                     647,755,325
<RECEIVABLES>                                8,469,699
<ASSETS-OTHER>                                 226,628
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             656,451,652
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    6,570,613
<TOTAL-LIABILITIES>                          6,570,613
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,889,620
<SHARES-COMMON-STOCK>                      188,335,562
<SHARES-COMMON-PRIOR>                      142,379,077
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (8,581)
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               649,881,039
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           31,621,069
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (4,207,151)
<NET-INVESTMENT-INCOME>                     27,413,918
<REALIZED-GAINS-CURRENT>                           332
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       27,414,250
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (6,865,359)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  1,460,864,924
<NUMBER-OF-SHARES-REDEEMED>            (1,427,683,763)
<SHARES-REINVESTED>                          6,404,081
<NET-CHANGE-IN-ASSETS>                      60,134,133
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (8,912)
<GROSS-ADVISORY-FEES>                        1,427,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,085,000
<AVERAGE-NET-ASSETS>                       601,022,000
<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>                                  0.700


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 1
   <NAME> MAINSTAY MONEY MARKET FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       64,755,325
<INVESTMENTS-AT-VALUE>                     647,755,325
<RECEIVABLES>                                8,469,699
<ASSETS-OTHER>                                 226,628
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             656,451,652
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    6,570,613
<TOTAL-LIABILITIES>                          6,570,613
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,889,620
<SHARES-COMMON-STOCK>                      458,400,046
<SHARES-COMMON-PRIOR>                      438,430,970
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (8,581)
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               649,881,039
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           31,621,069
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (4,207,151)
<NET-INVESTMENT-INCOME>                     27,413,918
<REALIZED-GAINS-CURRENT>                           332
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       27,414,250
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   20,443,076
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    695,572,243
<NUMBER-OF-SHARES-REDEEMED>              (682,075,401)
<SHARES-REINVESTED>                         20,720,097
<NET-CHANGE-IN-ASSETS>                      82,074,265
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (8,912)
<GROSS-ADVISORY-FEES>                        1,427,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,085,000
<AVERAGE-NET-ASSETS>                       601,022,000
<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>                                  0.700


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 1
   <NAME> MAINSTAY MONEY MARKET FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      647,755,325
<INVESTMENTS-AT-VALUE>                     647,755,325
<RECEIVABLES>                                8,469,699
<ASSETS-OTHER>                                 226,628
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             656,451,652
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    6,570,613
<TOTAL-LIABILITIES>                          6,570,613
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   649,889,620
<SHARES-COMMON-STOCK>                        2,154,014
<SHARES-COMMON-PRIOR>                        3,920,834
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (8,581)
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               649,881,039
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           31,621,069
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (4,207,151)
<NET-INVESTMENT-INCOME>                     27,413,918
<REALIZED-GAINS-CURRENT>                           332
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       27,414,250
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (105,484)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     14,076,657
<NUMBER-OF-SHARES-REDEEMED>               (12,005,827)
<SHARES-REINVESTED>                             64,831
<NET-CHANGE-IN-ASSETS>                      29,444,427
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (8,912)
<GROSS-ADVISORY-FEES>                        1,427,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,085,000
<AVERAGE-NET-ASSETS>                       601,022,000
<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>                                  0.700


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY TAX FREE BOND FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      388,344,797
<INVESTMENTS-AT-VALUE>                     366,568,012
<RECEIVABLES>                                5,883,631
<ASSETS-OTHER>                                 998,440
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             373,450,083
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      867,429
<TOTAL-LIABILITIES>                            867,429
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   416,091,410
<SHARES-COMMON-STOCK>                        1,506,183
<SHARES-COMMON-PRIOR>                        1,751,806
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           1,114
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                  (22,074,242)
<ACCUM-APPREC-OR-DEPREC>                  (21,435,628)
<NET-ASSETS>                               372,582,654
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           25,005,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (5,585,324)
<NET-INVESTMENT-INCOME>                     19,419,682
<REALIZED-GAINS-CURRENT>                  (18,327,409)
<APPREC-INCREASE-CURRENT>                 (32,668,330)
<NET-CHANGE-FROM-OPS>                     (31,576,057)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (892,182)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,057,895
<NUMBER-OF-SHARES-REDEEMED>                (1,368,561)
<SHARES-REINVESTED>                             65,043
<NET-CHANGE-IN-ASSETS>                    (34,311,878)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (3,746,833)
<GROSS-ADVISORY-FEES>                        1,330,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,585,000
<AVERAGE-NET-ASSETS>                       443,459,000
<PER-SHARE-NAV-BEGIN>                           10.200
<PER-SHARE-NII>                                  0.450
<PER-SHARE-GAIN-APPREC>                        (1.120)
<PER-SHARE-DIVIDEND>                           (0.450)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.080
<EXPENSE-RATIO>                                  1.020


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY TAX FREE BOND FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      388,344,797
<INVESTMENTS-AT-VALUE>                     366,568,012
<RECEIVABLES>                                5,883,631
<ASSETS-OTHER>                                 998,440
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             373,450,083
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      867,429
<TOTAL-LIABILITIES>                            867,429
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   416,091,410
<SHARES-COMMON-STOCK>                       39,439,693
<SHARES-COMMON-PRIOR>                       45,210,246
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           1,114
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                  (22,074,242)
<ACCUM-APPREC-OR-DEPREC>                  (21,435,628)
<NET-ASSETS>                               372,582,654
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           25,005,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (5,585,324)
<NET-INVESTMENT-INCOME>                     19,419,682
<REALIZED-GAINS-CURRENT>                  (18,327,409)
<APPREC-INCREASE-CURRENT>                 (32,668,330)
<NET-CHANGE-FROM-OPS>                     (31,576,057)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (18,519,426)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,491,515
<NUMBER-OF-SHARES-REDEEMED>                (9,485,897)
<SHARES-REINVESTED>                          1,223,829
<NET-CHANGE-IN-ASSETS>                   (104,474,846)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (3,746,833)
<GROSS-ADVISORY-FEES>                        1,330,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,585,000
<AVERAGE-NET-ASSETS>                       443,459,000
<PER-SHARE-NAV-BEGIN>                           10.210
<PER-SHARE-NII>                                  0.430
<PER-SHARE-GAIN-APPREC>                        (1.120)
<PER-SHARE-DIVIDEND>                           (0.430)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.090
<EXPENSE-RATIO>                                  1.270


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 7
   <NAME> MAINSTAY TAX FREE BOND FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      388,344,797
<INVESTMENTS-AT-VALUE>                     366,568,012
<RECEIVABLES>                                5,883,631
<ASSETS-OTHER>                                 998,440
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             373,450,083
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      867,429
<TOTAL-LIABILITIES>                            867,429
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   416,091,410
<SHARES-COMMON-STOCK>                       48,460,846
<SHARES-COMMON-PRIOR>                       50,420,942
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           1,114
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                  (22,074,242)
<ACCUM-APPREC-OR-DEPREC>                  (21,435,628)
<NET-ASSETS>                               372,582,654
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           25,005,006
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (5,585,324)
<NET-INVESTMENT-INCOME>                     19,419,682
<REALIZED-GAINS-CURRENT>                  (18,327,409)
<APPREC-INCREASE-CURRENT>                 (32,668,330)
<NET-CHANGE-FROM-OPS>                     (31,576,057)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (6,960)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         58,705
<NUMBER-OF-SHARES-REDEEMED>                    (6,102)
<SHARES-REINVESTED>                                744
<NET-CHANGE-IN-ASSETS>                    (31,075,761)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (3,746,833)
<GROSS-ADVISORY-FEES>                        1,330,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,585,000
<AVERAGE-NET-ASSETS>                       443,459,000
<PER-SHARE-NAV-BEGIN>                           10.210
<PER-SHARE-NII>                                  0.430
<PER-SHARE-GAIN-APPREC>                        (1.120)
<PER-SHARE-DIVIDEND>                           (0.430)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.090
<EXPENSE-RATIO>                                  1.270


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 8
   <NAME> MAINSTAY TOTAL RETURN FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,278,217,144
<INVESTMENTS-AT-VALUE>                   1,895,190,099
<RECEIVABLES>                               31,467,433
<ASSETS-OTHER>                             202,088,153
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,128,745,685
<PAYABLE-FOR-SECURITIES>                    29,973,255
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  210,573,502
<TOTAL-LIABILITIES>                        240,546,757
<SENIOR-EQUITY>                          1,888,198,928
<PAID-IN-CAPITAL-COMMON>                 1,157,600,012
<SHARES-COMMON-STOCK>                        7,489,010
<SHARES-COMMON-PRIOR>                        6,112,943
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (199,943)
<ACCUMULATED-NET-GAINS>                    113,825,904
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   616,972,955
<NET-ASSETS>                             1,888,198,928
<DIVIDEND-INCOME>                            4,852,483
<INTEREST-INCOME>                           37,513,520
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (31,150,188)
<NET-INVESTMENT-INCOME>                     11,215,815
<REALIZED-GAINS-CURRENT>                   198,124,218
<APPREC-INCREASE-CURRENT>                   49,685,919
<NET-CHANGE-FROM-OPS>                      259,025,952
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (2,404,941)
<DISTRIBUTIONS-OF-GAINS>                   (9,937,902)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,840,375
<NUMBER-OF-SHARES-REDEEMED>                (2,901,882)
<SHARES-REINVESTED>                            437,584
<NET-CHANGE-IN-ASSETS>                     282,014,069
<ACCUMULATED-NII-PRIOR>                         33,190
<ACCUMULATED-GAINS-PRIOR>                    9,295,244
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       11,050,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             31,641,000
<AVERAGE-NET-ASSETS>                     1,726,504,000
<PER-SHARE-NAV-BEGIN>                           24.960
<PER-SHARE-NII>                                  0.340
<PER-SHARE-GAIN-APPREC>                          3.690
<PER-SHARE-DIVIDEND>                           (0.340)
<PER-SHARE-DISTRIBUTIONS>                      (1.420)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             27.230
<EXPENSE-RATIO>                                  1.130


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 8
   <NAME> MAINSTAY TOTAL RETURN FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,278,217,144
<INVESTMENTS-AT-VALUE>                   1,895,190,099
<RECEIVABLES>                               31,467,433
<ASSETS-OTHER>                             202,088,153
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,128,745,685
<PAYABLE-FOR-SECURITIES>                    29,973,255
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  210,573,502
<TOTAL-LIABILITIES>                        240,546,757
<SENIOR-EQUITY>                          1,888,198,928
<PAID-IN-CAPITAL-COMMON>                 1,157,600,012
<SHARES-COMMON-STOCK>                       61,637,509
<SHARES-COMMON-PRIOR>                       59,388,114
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (199,943)
<ACCUMULATED-NET-GAINS>                    113,825,904
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   616,972,955
<NET-ASSETS>                             1,888,198,928
<DIVIDEND-INCOME>                            4,852,483
<INTEREST-INCOME>                           37,513,520
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (31,150,188)
<NET-INVESTMENT-INCOME>                     11,215,815
<REALIZED-GAINS-CURRENT>                   198,124,218
<APPREC-INCREASE-CURRENT>                   49,685,919
<NET-CHANGE-FROM-OPS>                      259,025,952
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (9,024,586)
<DISTRIBUTIONS-OF-GAINS>                  (83,382,941)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      8,323,993
<NUMBER-OF-SHARES-REDEEMED>                (9,492,006)
<SHARES-REINVESTED>                          3,417,408
<NET-CHANGE-IN-ASSETS>                     225,243,414
<ACCUMULATED-NII-PRIOR>                         33,190
<ACCUMULATED-GAINS-PRIOR>                    9,295,244
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       11,050,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             31,641,000
<AVERAGE-NET-ASSETS>                     1,726,504,000
<PER-SHARE-NAV-BEGIN>                           24.960
<PER-SHARE-NII>                                  0.150
<PER-SHARE-GAIN-APPREC>                          3.690
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                      (1,420)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             27.230
<EXPENSE-RATIO>                                  1.880


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 8
   <NAME> MAINSTAY TOTAL RETURN FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                    1,278,217,144
<INVESTMENTS-AT-VALUE>                   1,895,190,099
<RECEIVABLES>                               31,467,433
<ASSETS-OTHER>                             202,088,153
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,128,745,685
<PAYABLE-FOR-SECURITIES>                    29,973,255
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  210,573,502
<TOTAL-LIABILITIES>                        240,546,757
<SENIOR-EQUITY>                          1,888,198,928
<PAID-IN-CAPITAL-COMMON>                 1,157,600,012
<SHARES-COMMON-STOCK>                          204,843
<SHARES-COMMON-PRIOR>                           14,393
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (199,943)
<ACCUMULATED-NET-GAINS>                    113,825,904
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   616,972,955
<NET-ASSETS>                             1,888,198,928
<DIVIDEND-INCOME>                            4,852,483
<INTEREST-INCOME>                           37,513,520
<OTHER-INCOME>                                       0
<EXPENSES-NET>                            (31,150,188)
<NET-INVESTMENT-INCOME>                     11,215,815
<REALIZED-GAINS-CURRENT>                   198,124,218
<APPREC-INCREASE-CURRENT>                   49,685,919
<NET-CHANGE-FROM-OPS>                      259,025,952
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (19,421)
<DISTRIBUTIONS-OF-GAINS>                     (272,715)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        197,642
<NUMBER-OF-SHARES-REDEEMED>                   (17,820)
<SHARES-REINVESTED>                             10,629
<NET-CHANGE-IN-ASSETS>                     263,624,860
<ACCUMULATED-NII-PRIOR>                         33,190
<ACCUMULATED-GAINS-PRIOR>                    9,295,244
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       11,050,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             31,641,000
<AVERAGE-NET-ASSETS>                     1,726,504,000
<PER-SHARE-NAV-BEGIN>                           24.960
<PER-SHARE-NII>                                  0.150
<PER-SHARE-GAIN-APPREC>                          3.690
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                      (1.420)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             27.230
<EXPENSE-RATIO>                                  1.880


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 101
   <NAME> MAINSTAY EQUITY INDEX FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      822,958,529
<INVESTMENTS-AT-VALUE>                   1,253,328,694
<RECEIVABLES>                                4,735,567
<ASSETS-OTHER>                                  54,309
<OTHER-ITEMS-ASSETS>                            31,188
<TOTAL-ASSETS>                           1,258,149,758
<PAYABLE-FOR-SECURITIES>                       345,612
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,786,009
<TOTAL-LIABILITIES>                          4,131,621
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   821,754,299
<SHARES-COMMON-STOCK>                       26,478,939
<SHARES-COMMON-PRIOR>                       20,195,467
<ACCUMULATED-NII-CURRENT>                      134,637
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,695,251
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   430,433,950
<NET-ASSETS>                             1,254,018,137
<DIVIDEND-INCOME>                           12,981,287
<INTEREST-INCOME>                            2,233,564
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (9,921,927)
<NET-INVESTMENT-INCOME>                      5,292,924
<REALIZED-GAINS-CURRENT>                    21,903,883
<APPREC-INCREASE-CURRENT>                  168,170,091
<NET-CHANGE-FROM-OPS>                      195,366,898
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (5,158,287)
<DISTRIBUTIONS-OF-GAINS>                  (26,146,715)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     16,761,109
<NUMBER-OF-SHARES-REDEEMED>               (11,172,711)
<SHARES-REINVESTED>                            695,075
<NET-CHANGE-IN-ASSETS>                     456,898,124
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    5,938,083
<OVERDISTRIB-NII-PRIOR>                              0
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<PER-SHARE-NAV-BEGIN>                           39.470
<PER-SHARE-NII>                                  0.200
<PER-SHARE-GAIN-APPREC>                          7.690
<PER-SHARE-DIVIDEND>                           (0.200)
<PER-SHARE-DISTRIBUTIONS>                      (0.990)
<RETURNS-OF-CAPITAL>                             1.190
<PER-SHARE-NAV-END>                             47.360
<EXPENSE-RATIO>                                  0.940


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY CALIFORNIA TAX FREE BOND FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<NET-INVESTMENT-INCOME>                      1,151,090
<REALIZED-GAINS-CURRENT>                   (1,171,936)
<APPREC-INCREASE-CURRENT>                  (1,171,936)
<NET-CHANGE-FROM-OPS>                      (1,893,778)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (669,100)
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<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.890
<EXPENSE-RATIO>                                  1.240


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY CALIFORNIA TAX FREE BOND FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
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<INVESTMENTS-AT-VALUE>                      24,339,664
<RECEIVABLES>                                  320,432
<ASSETS-OTHER>                                  66,523
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<TOTAL-ASSETS>                              24,726,619
<PAYABLE-FOR-SECURITIES>                             0
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<NET-INVESTMENT-INCOME>                      1,151,090
<REALIZED-GAINS-CURRENT>                   (1,171,936)
<APPREC-INCREASE-CURRENT>                  (1,872,932)
<NET-CHANGE-FROM-OPS>                      (1,893,778)
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<DISTRIBUTIONS-OF-INCOME>                    (466,785)
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<NUMBER-OF-SHARES-REDEEMED>                  (236,383)
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<NET-CHANGE-IN-ASSETS>                     (1,509,067)
<ACCUMULATED-NII-PRIOR>                              0
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<OVERDISTRIB-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                                   0
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<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.870
<EXPENSE-RATIO>                                  1.490


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY CALIFORNIA TAX FREE BOND FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       25,791,810
<INVESTMENTS-AT-VALUE>                      24,339,664
<RECEIVABLES>                                  320,432
<ASSETS-OTHER>                                  66,523
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              24,726,619
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       63,808
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<SENIOR-EQUITY>                                      0
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<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,523,377
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (372,287)
<NET-INVESTMENT-INCOME>                      1,151,090
<REALIZED-GAINS-CURRENT>                   (1,171,936)
<APPREC-INCREASE-CURRENT>                  (1,872,932)
<NET-CHANGE-FROM-OPS>                      (1,893,778)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (17,129)
<DISTRIBUTIONS-OF-GAINS>                       (2,513)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        132,116
<NUMBER-OF-SHARES-REDEEMED>                   (16,682)
<SHARES-REINVESTED>                              2,098
<NET-CHANGE-IN-ASSETS>                       (819,205)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       59,582
<OVERDISTRIB-NII-PRIOR>                              0
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<PER-SHARE-NII>                                  0.380
<PER-SHARE-GAIN-APPREC>                        (1.050)
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<PER-SHARE-DISTRIBUTIONS>                      (0.020)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.870
<EXPENSE-RATIO>                                  1.490


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY NEW YORK TAX FREE BOND FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       20,757,695
<INVESTMENTS-AT-VALUE>                      19,626,608
<RECEIVABLES>                                  360,264
<ASSETS-OTHER>                                  57,605
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<TOTAL-ASSETS>                              20,044,477
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       73,781
<TOTAL-LIABILITIES>                             73,781
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    21,796,294
<SHARES-COMMON-STOCK>                        1,422,427
<SHARES-COMMON-PRIOR>                        1,532,975
<ACCUMULATED-NII-CURRENT>                            0
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<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (706,355)
<ACCUM-APPREC-OR-DEPREC>                   (1,119,243)
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<DIVIDEND-INCOME>                                    0
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<EXPENSES-NET>                               (297,570)
<NET-INVESTMENT-INCOME>                      1,015,436
<REALIZED-GAINS-CURRENT>                     (706,356)
<APPREC-INCREASE-CURRENT>                  (1,508,974)
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (665,626)
<DISTRIBUTIONS-OF-GAINS>                      (12,761)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         53,304
<NUMBER-OF-SHARES-REDEEMED>                  (198,742)
<SHARES-REINVESTED>                             34,890
<NET-CHANGE-IN-ASSETS>                     (2,946,539)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       19,734
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.110
<EXPENSE-RATIO>                                  1.240


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY NEW YORK TAX FREE BOND FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       20,757,695
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<RECEIVABLES>                                  360,264
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<SENIOR-LONG-TERM-DEBT>                              0
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    21,796,294
<SHARES-COMMON-STOCK>                          771,740
<SHARES-COMMON-PRIOR>                          820,767
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<ACCUM-APPREC-OR-DEPREC>                   (1,119,243)
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<DIVIDEND-INCOME>                                    0
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<NET-INVESTMENT-INCOME>                      1,015,436
<REALIZED-GAINS-CURRENT>                     (706,356)
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<NUMBER-OF-SHARES-SOLD>                        176,370
<NUMBER-OF-SHARES-REDEEMED>                  (247,394)
<SHARES-REINVESTED>                             21,996
<NET-CHANGE-IN-ASSETS>                     (1,987,177)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        19734
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
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<PER-SHARE-NAV-BEGIN>                           10.010
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<PER-SHARE-GAIN-APPREC>                        (0.960)
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<PER-SHARE-DISTRIBUTIONS>                      (0.010)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.040
<EXPENSE-RATIO>                                  1.490


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 12
   <NAME> MAINSTAY NEW YORK TAX FREE BOND FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
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<INVESTMENTS-AT-VALUE>                      19,626,608
<RECEIVABLES>                                  360,264
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    21,796,294
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<DIVIDEND-INCOME>                                    0
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<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (297,570)
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<REALIZED-GAINS-CURRENT>                     (706,356)
<APPREC-INCREASE-CURRENT>                  (1,508,974)
<NET-CHANGE-FROM-OPS>                      (1,199,894)
<EQUALIZATION>                                       0
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<NUMBER-OF-SHARES-SOLD>                          4,144
<NUMBER-OF-SHARES-REDEEMED>                        (1)
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<PER-SHARE-NAV-BEGIN>                           10.010
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<PER-SHARE-GAIN-APPREC>                        (0.960)
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<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.040
<EXPENSE-RATIO>                                  1.490


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 14
   <NAME> MAINSTAY INTERNATIONAL BOND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<PERIOD-START>                             JAN-01-1999
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<SENIOR-EQUITY>                                      0
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<SHARES-COMMON-STOCK>                        1,358,225
<SHARES-COMMON-PRIOR>                        1,470,505
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<REALIZED-GAINS-CURRENT>                   (1,414,883)
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<DISTRIBUTIONS-OF-INCOME>                    (767,038)
<DISTRIBUTIONS-OF-GAINS>                     (126,027)
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<NUMBER-OF-SHARES-REDEEMED>                  (352,765)
<SHARES-REINVESTED>                             40,736
<NET-CHANGE-IN-ASSETS>                     (4,801,080)
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<PER-SHARE-NII>                                  0.350
<PER-SHARE-GAIN-APPREC>                        (1.210)
<PER-SHARE-DIVIDEND>                           (0.040)
<PER-SHARE-DISTRIBUTIONS>                      (0.090)
<RETURNS-OF-CAPITAL>                           (0.510)
<PER-SHARE-NAV-END>                              9.070
<EXPENSE-RATIO>                                   1.61


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 14
   <NAME> MAINSTAY INTERNATIONAL BOND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       27,745,345
<INVESTMENTS-AT-VALUE>                      26,026,037
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<ASSETS-OTHER>                                 109,282
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              26,796,557
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      467,701
<TOTAL-LIABILITIES>                            467,701
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    28,713,864
<SHARES-COMMON-STOCK>                        1,536,162
<SHARES-COMMON-PRIOR>                        1,775,426
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (42,122)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (558,585)
<ACCUM-APPREC-OR-DEPREC>                   (1,784,301)
<NET-ASSETS>                                28,328,856
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,620,840
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (605,073)
<NET-INVESTMENT-INCOME>                      1,015,767
<REALIZED-GAINS-CURRENT>                   (1,414,883)
<APPREC-INCREASE-CURRENT>                  (2,397,019)
<NET-CHANGE-FROM-OPS>                      (2,796,135)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (802,657)
<DISTRIBUTIONS-OF-GAINS>                     (142,146)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        247,392
<NUMBER-OF-SHARES-REDEEMED>                  (571,854)
<SHARES-REINVESTED>                             85,198
<NET-CHANGE-IN-ASSETS>                     (6,058,417)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      256,981
<OVERDISTRIB-NII-PRIOR>                       (78,132)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          135,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                695,000
<AVERAGE-NET-ASSETS>                        29,937,000
<PER-SHARE-NAV-BEGIN>                           10.590
<PER-SHARE-NII>                                  0.280
<PER-SHARE-GAIN-APPREC>                        (1.220)
<PER-SHARE-DIVIDEND>                           (0.030)
<PER-SHARE-DISTRIBUTIONS>                      (0.090)
<RETURNS-OF-CAPITAL>                           (0.450)
<PER-SHARE-NAV-END>                              9.080
<EXPENSE-RATIO>                                   2.36


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 14
   <NAME> MAINSTAY INTERNATIONAL BOND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       27,745,345
<INVESTMENTS-AT-VALUE>                      26,026,037
<RECEIVABLES>                                  661,238
<ASSETS-OTHER>                                 109,282
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              26,796,557
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      467,701
<TOTAL-LIABILITIES>                            467,701
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    28,713,864
<SHARES-COMMON-STOCK>                            5,241
<SHARES-COMMON-PRIOR>                               30
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (42,122)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (558,585)
<ACCUM-APPREC-OR-DEPREC>                   (1,784,301)
<NET-ASSETS>                                28,328,856
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,620,840
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (605,073)
<NET-INVESTMENT-INCOME>                      1,015,767
<REALIZED-GAINS-CURRENT>                   (1,414,883)
<APPREC-INCREASE-CURRENT>                  (2,397,019)
<NET-CHANGE-FROM-OPS>                      (2,796,135)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (2,293)
<DISTRIBUTIONS-OF-GAINS>                         (480)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         12,511
<NUMBER-OF-SHARES-REDEEMED>                    (7,511)
<SHARES-REINVESTED>                                211
<NET-CHANGE-IN-ASSETS>                     (2,796,135)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      256,981
<OVERDISTRIB-NII-PRIOR>                       (78,132)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          135,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                695,000
<AVERAGE-NET-ASSETS>                        29,937,000
<PER-SHARE-NAV-BEGIN>                           10.590
<PER-SHARE-NII>                                  0.280
<PER-SHARE-GAIN-APPREC>                        (1.220)
<PER-SHARE-DIVIDEND>                           (0.030)
<PER-SHARE-DISTRIBUTIONS>                      (0.090)
<RETURNS-OF-CAPITAL>                           (0.450)
<PER-SHARE-NAV-END>                              9.080
<EXPENSE-RATIO>                                   2.36


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 13
   <NAME> MAINSTAY INTERNTIONAL EQUITY FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       89,627,564
<INVESTMENTS-AT-VALUE>                     129,349,113
<RECEIVABLES>                                  530,326
<ASSETS-OTHER>                               1,575,289
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             131,454,728
<PAYABLE-FOR-SECURITIES>                     1,007,569
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      998,565
<TOTAL-LIABILITIES>                          2,002,134
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    88,642,907
<SHARES-COMMON-STOCK>                        2,258,751
<SHARES-COMMON-PRIOR>                        1,974,901
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                     (1,129,569)
<ACCUMULATED-NET-GAINS>                      2,426,589
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    39,508,667
<NET-ASSETS>                               129,448,594
<DIVIDEND-INCOME>                            1,809,350
<INTEREST-INCOME>                               93,958
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (2,650,931)
<NET-INVESTMENT-INCOME>                      (747,623)
<REALIZED-GAINS-CURRENT>                     7,554,766
<APPREC-INCREASE-CURRENT>                   21,120,421
<NET-CHANGE-FROM-OPS>                       27,927,564
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (71,083)
<DISTRIBUTIONS-OF-GAINS>                     (626,133)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      5,741,962
<NUMBER-OF-SHARES-REDEEMED>                (5,502,507)
<SHARES-REINVESTED>                             44,395
<NET-CHANGE-IN-ASSETS>                      30,501,019
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                      (755,640)
<OVERDIST-NET-GAINS-PRIOR>                 (2,051,711)
<GROSS-ADVISORY-FEES>                          635,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,651,000
<AVERAGE-NET-ASSETS>                       105,760,000
<PER-SHARE-NAV-BEGIN>                           12.210
<PER-SHARE-NII>                                (0.070)
<PER-SHARE-GAIN-APPREC>                          3.410
<PER-SHARE-DIVIDEND>                           (0.030)
<PER-SHARE-DISTRIBUTIONS>                      (0.290)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             15.230
<EXPENSE-RATIO>                                  1.940


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 13
   <NAME> MAINSTAY INTERNATIONAL EQUITY FUND 15B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       89,627,564
<INVESTMENTS-AT-VALUE>                     129,649,113
<RECEIVABLES>                                  530,326
<ASSETS-OTHER>                               1,575,289
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             131,454,728
<PAYABLE-FOR-SECURITIES>                     1,007,569
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      998,565
<TOTAL-LIABILITIES>                          2,006,134
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    88,642,907
<SHARES-COMMON-STOCK>                        6,333,271
<SHARES-COMMON-PRIOR>                        6,251,105
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                     (1,129,569)
<ACCUMULATED-NET-GAINS>                      2,426,589
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    39,508,667
<NET-ASSETS>                               129,448,594
<DIVIDEND-INCOME>                            1,809,350
<INTEREST-INCOME>                               93,958
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (2,650,931)
<NET-INVESTMENT-INCOME>                      (747,623)
<REALIZED-GAINS-CURRENT>                     7,554,766
<APPREC-INCREASE-CURRENT>                   21,120,421
<NET-CHANGE-FROM-OPS>                       27,927,564
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (205,278)
<DISTRIBUTIONS-OF-GAINS>                   (1,793,049)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,921,930
<NUMBER-OF-SHARES-REDEEMED>                (1,977,163)
<SHARES-REINVESTED>                            137,399
<NET-CHANGE-IN-ASSETS>                      27,094,910
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                      (755,640)
<OVERDIST-NET-GAINS-PRIOR>                 (2,051,711)
<GROSS-ADVISORY-FEES>                          635,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,651,000
<AVERAGE-NET-ASSETS>                       105,760,000
<PER-SHARE-NAV-BEGIN>                            12.08
<PER-SHARE-NII>                                (0.090)
<PER-SHARE-GAIN-APPREC>                          3.280
<PER-SHARE-DIVIDEND>                           (0.030)
<PER-SHARE-DISTRIBUTIONS>                      (0.290)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             14.950
<EXPENSE-RATIO>                                  2.690


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 13
   <NAME> MAINSTAY INTERNATIONAL EQUITY FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             SEP-01-1998
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       89,627,564
<INVESTMENTS-AT-VALUE>                     129,349,113
<RECEIVABLES>                                  530,326
<ASSETS-OTHER>                               1,575,289
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             131,454,728
<PAYABLE-FOR-SECURITIES>                     1,007,569
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      998,565
<TOTAL-LIABILITIES>                          2,006,134
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    88,642,907
<SHARES-COMMON-STOCK>                           22,942
<SHARES-COMMON-PRIOR>                              892
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                     (1,129,569)
<ACCUMULATED-NET-GAINS>                      2,426,589
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    39,508,667
<NET-ASSETS>                               129,448,594
<DIVIDEND-INCOME>                            1,809,350
<INTEREST-INCOME>                               93,958
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (2,650,931)
<NET-INVESTMENT-INCOME>                      (747,623)
<REALIZED-GAINS-CURRENT>                     7,554,766
<APPREC-INCREASE-CURRENT>                   21,120,421
<NET-CHANGE-FROM-OPS>                       27,927,564
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (742)
<DISTRIBUTIONS-OF-GAINS>                       (6,487)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,152,824
<NUMBER-OF-SHARES-REDEEMED>                (1,131,251)
<SHARES-REINVESTED>                                477
<NET-CHANGE-IN-ASSETS>                      28,065,465
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                      (755,640)
<OVERDIST-NET-GAINS-PRIOR>                 (2,051,711)
<GROSS-ADVISORY-FEES>                          635,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,651,000
<AVERAGE-NET-ASSETS>                       105,760,000
<PER-SHARE-NAV-BEGIN>                            12.08
<PER-SHARE-NII>                                (0.130)
<PER-SHARE-GAIN-APPREC>                          3.200
<PER-SHARE-DIVIDEND>                           (0.030)
<PER-SHARE-DISTRIBUTIONS>                      (0.290)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             14.830
<EXPENSE-RATIO>                                  2.690


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 16
   <NAME> MAINSTAY STRATEGIC INCOME FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       82,859,321
<INVESTMENTS-AT-VALUE>                      78,748,357
<RECEIVABLES>                                1,611,522
<ASSETS-OTHER>                                 339,742
<OTHER-ITEMS-ASSETS>                           168,269
<TOTAL-ASSETS>                              80,867,890
<PAYABLE-FOR-SECURITIES>                       197,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      335,783
<TOTAL-LIABILITIES>                            533,439
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    87,233,486
<SHARES-COMMON-STOCK>                        2,165,620
<SHARES-COMMON-PRIOR>                        2,223,982
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (288,086)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,600,588)
<ACCUM-APPREC-OR-DEPREC>                   (4,010,361)
<NET-ASSETS>                                80,334,451
<DIVIDEND-INCOME>                              282,985
<INTEREST-INCOME>                            6,759,744
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,613,131)
<NET-INVESTMENT-INCOME>                      5,429,598
<REALIZED-GAINS-CURRENT>                   (2,428,256)
<APPREC-INCREASE-CURRENT>                  (1,600,170)
<NET-CHANGE-FROM-OPS>                        1,401,172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (1,560,949)
<DISTRIBUTIONS-OF-GAINS>                      (62,986)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        804,778
<NUMBER-OF-SHARES-REDEEMED>                  (994,475)
<SHARES-REINVESTED>                            131,335
<NET-CHANGE-IN-ASSETS>                       (742,581)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      133,445
<OVERDISTRIB-NII-PRIOR>                       (99,692)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          254,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,613,000
<AVERAGE-NET-ASSETS>                        84,736,000
<PER-SHARE-NAV-BEGIN>                            9.710
<PER-SHARE-NII>                                  0.670
<PER-SHARE-GAIN-APPREC>                        (0.450)
<PER-SHARE-DIVIDEND>                           (0.700)
<PER-SHARE-DISTRIBUTIONS>                      (0.030)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.200
<EXPENSE-RATIO>                                  1.340


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 16
   <NAME> MAINSTAY STRATEGIC INCOME FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       82,859,321
<INVESTMENTS-AT-VALUE>                      78,748,357
<RECEIVABLES>                                1,611,522
<ASSETS-OTHER>                                 339,742
<OTHER-ITEMS-ASSETS>                           168,269
<TOTAL-ASSETS>                              80,867,890
<PAYABLE-FOR-SECURITIES>                       197,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      335,783
<TOTAL-LIABILITIES>                            533,439
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    87,233,486
<SHARES-COMMON-STOCK>                        6,491,489
<SHARES-COMMON-PRIOR>                        6,829,161
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (288,086)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,600,588)
<ACCUM-APPREC-OR-DEPREC>                   (4,010,361)
<NET-ASSETS>                                80,334,451
<DIVIDEND-INCOME>                              282,985
<INTEREST-INCOME>                            6,759,744
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,613,131)
<NET-INVESTMENT-INCOME>                      5,429,598
<REALIZED-GAINS-CURRENT>                   (2,428,256)
<APPREC-INCREASE-CURRENT>                  (1,600,170)
<NET-CHANGE-FROM-OPS>                        1,401,172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (4,119,595)
<DISTRIBUTIONS-OF-GAINS>                     (190,675)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,246,103
<NUMBER-OF-SHARES-REDEEMED>                (1,936,052)
<SHARES-REINVESTED>                            352,279
<NET-CHANGE-IN-ASSETS>                     (6,170,573)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      133,445
<OVERDISTRIB-NII-PRIOR>                       (99,692)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          254,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,613,000
<AVERAGE-NET-ASSETS>                        84,736,000
<PER-SHARE-NAV-BEGIN>                            9.700
<PER-SHARE-NII>                                  0.600
<PER-SHARE-GAIN-APPREC>                        (0.450)
<PER-SHARE-DIVIDEND>                           (0.630)
<PER-SHARE-DISTRIBUTIONS>                      (0.030)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.190
<EXPENSE-RATIO>                                  2.090


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 16
   <NAME> MAINSTAY STRATEGIC INCOME FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       82,859,321
<INVESTMENTS-AT-VALUE>                      78,748,357
<RECEIVABLES>                                1,611,522
<ASSETS-OTHER>                                 339,742
<OTHER-ITEMS-ASSETS>                           168,269
<TOTAL-ASSETS>                              80,867,890
<PAYABLE-FOR-SECURITIES>                       197,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      335,783
<TOTAL-LIABILITIES>                            533,439
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    87,233,486
<SHARES-COMMON-STOCK>                           83,596
<SHARES-COMMON-PRIOR>                            9,417
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (288,086)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,600,588)
<ACCUM-APPREC-OR-DEPREC>                   (4,010,361)
<NET-ASSETS>                                80,334,451
<DIVIDEND-INCOME>                              282,985
<INTEREST-INCOME>                            6,759,744
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,613,131)
<NET-INVESTMENT-INCOME>                      5,429,598
<REALIZED-GAINS-CURRENT>                   (2,428,256)
<APPREC-INCREASE-CURRENT>                  (1,600,170)
<NET-CHANGE-FROM-OPS>                        1,401,172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (56,764)
<DISTRIBUTIONS-OF-GAINS>                       (4,445)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,730,493
<NUMBER-OF-SHARES-REDEEMED>                (1,661,583)
<SHARES-REINVESTED>                              5,266
<NET-CHANGE-IN-ASSETS>                       2,082,528
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      133,445
<OVERDISTRIB-NII-PRIOR>                       (99,692)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          254,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,613,000
<AVERAGE-NET-ASSETS>                        84,736,000
<PER-SHARE-NAV-BEGIN>                            9.700
<PER-SHARE-NII>                                  0.600
<PER-SHARE-GAIN-APPREC>                        (0.450)
<PER-SHARE-DIVIDEND>                           (0.630)
<PER-SHARE-DISTRIBUTIONS>                      (0.030)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.190
<EXPENSE-RATIO>                                  2.090


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 11
   <NAME> MAINSTAY STRATEGIC VALUE FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       51,330,843
<INVESTMENTS-AT-VALUE>                      54,495,109
<RECEIVABLES>                                  410,049
<ASSETS-OTHER>                                 127,093
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              55,032,251
<PAYABLE-FOR-SECURITIES>                        91,123
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      186,041
<TOTAL-LIABILITIES>                            277,164
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    51,981,848
<SHARES-COMMON-STOCK>                        1,695,497
<SHARES-COMMON-PRIOR>                        1,762,515
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (31,438)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (358,526)
<ACCUM-APPREC-OR-DEPREC>                     3,163,203
<NET-ASSETS>                                54,755,087
<DIVIDEND-INCOME>                              838,092
<INTEREST-INCOME>                            1,213,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               1,228,326
<NET-INVESTMENT-INCOME>                        823,483
<REALIZED-GAINS-CURRENT>                     1,582,116
<APPREC-INCREASE-CURRENT>                    4,185,697
<NET-CHANGE-FROM-OPS>                        6,591,296
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (381,688)
<DISTRIBUTIONS-OF-GAINS>                     (273,838)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        229,766
<NUMBER-OF-SHARES-REDEEMED>                  (356,102)
<SHARES-REINVESTED>                             59,318
<NET-CHANGE-IN-ASSETS>                       5,340,243
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,459)
<OVERDIST-NET-GAINS-PRIOR>                 (1,155,507)
<GROSS-ADVISORY-FEES>                          210,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,228,000
<AVERAGE-NET-ASSETS>                        56,089,000
<PER-SHARE-NAV-BEGIN>                           10.180
<PER-SHARE-NII>                                  0.230
<PER-SHARE-GAIN-APPREC>                          1.140
<PER-SHARE-DIVIDEND>                           (0.230)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                           (0.170)
<PER-SHARE-NAV-END>                             11.150
<EXPENSE-RATIO>                                  1.690


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 11
   <NAME> MAINSTAY STRATEGIC VALUE FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       51,330,843
<INVESTMENTS-AT-VALUE>                      54,495,109
<RECEIVABLES>                                  410,049
<ASSETS-OTHER>                                 127,093
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              55,032,251
<PAYABLE-FOR-SECURITIES>                        91,123
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      186,041
<TOTAL-LIABILITIES>                            277,164
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    51,981,848
<SHARES-COMMON-STOCK>                        3,206,471
<SHARES-COMMON-PRIOR>                        3,787,832
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (31,438)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (358,526)
<ACCUM-APPREC-OR-DEPREC>                     3,163,203
<NET-ASSETS>                                54,755,087
<DIVIDEND-INCOME>                              838,092
<INTEREST-INCOME>                            1,213,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               1,228,326
<NET-INVESTMENT-INCOME>                        823,483
<REALIZED-GAINS-CURRENT>                     1,582,116
<APPREC-INCREASE-CURRENT>                    4,185,697
<NET-CHANGE-FROM-OPS>                        6,591,296
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (489,936)
<DISTRIBUTIONS-OF-GAINS>                     (522,956)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        601,436
<NUMBER-OF-SHARES-REDEEMED>                (1,274,310)
<SHARES-REINVESTED>                             91,513
<NET-CHANGE-IN-ASSETS>                       (610,568)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,459)
<OVERDIST-NET-GAINS-PRIOR>                 (1,155,507)
<GROSS-ADVISORY-FEES>                          210,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,228,000
<AVERAGE-NET-ASSETS>                        56,089,000
<PER-SHARE-NAV-BEGIN>                           10.170
<PER-SHARE-NII>                                  0.150
<PER-SHARE-GAIN-APPREC>                          1.130
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                           (0.170)
<PER-SHARE-NAV-END>                             11.130
<EXPENSE-RATIO>                                  2.440


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 11
   <NAME> MAINSTAY STRATEGIC VALUE FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       51,330,843
<INVESTMENTS-AT-VALUE>                      54,495,109
<RECEIVABLES>                                  410,049
<ASSETS-OTHER>                                 127,093
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              55,032,251
<PAYABLE-FOR-SECURITIES>                        91,123
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      186,041
<TOTAL-LIABILITIES>                            277,164
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    51,981,848
<SHARES-COMMON-STOCK>                           13,804
<SHARES-COMMON-PRIOR>                            8,220
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (31,438)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (358,526)
<ACCUM-APPREC-OR-DEPREC>                     3,163,203
<NET-ASSETS>                                54,755,087
<DIVIDEND-INCOME>                              838,092
<INTEREST-INCOME>                            1,213,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               1,228,326
<NET-INVESTMENT-INCOME>                        823,483
<REALIZED-GAINS-CURRENT>                     1,582,116
<APPREC-INCREASE-CURRENT>                    4,185,697
<NET-CHANGE-FROM-OPS>                        6,591,296
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (1,729)
<DISTRIBUTIONS-OF-GAINS>                       (2,244)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         17,619
<NUMBER-OF-SHARES-REDEEMED>                   (12,164)
<SHARES-REINVESTED>                                129
<NET-CHANGE-IN-ASSETS>                       6,650,428
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (4,459)
<OVERDIST-NET-GAINS-PRIOR>                 (1,155,507)
<GROSS-ADVISORY-FEES>                          210,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,228,000
<AVERAGE-NET-ASSETS>                        56,089,000
<PER-SHARE-NAV-BEGIN>                           10.170
<PER-SHARE-NII>                                  0.150
<PER-SHARE-GAIN-APPREC>                          1.130
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                           (0.170)
<PER-SHARE-NAV-END>                             11.130
<EXPENSE-RATIO>                                  2.540


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 18
   <NAME> MAINSTAY SMALL CAP GROWTH FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      135,737,814
<INVESTMENTS-AT-VALUE>                     203,927,381
<RECEIVABLES>                                2,216,767
<ASSETS-OTHER>                                  56,466
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             206,245,614
<PAYABLE-FOR-SECURITIES>                     8,850,451
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      405,549
<TOTAL-LIABILITIES>                          9,256,000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   122,586,973
<SHARES-COMMON-STOCK>                        2,954,347
<SHARES-COMMON-PRIOR>                        1,457,546
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      6,168,074
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    68,234,567
<NET-ASSETS>                               196,989,614
<DIVIDEND-INCOME>                               31,251
<INTEREST-INCOME>                              269,980
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,681,386)
<NET-INVESTMENT-INCOME>                    (1,380,155)
<REALIZED-GAINS-CURRENT>                     9,165,533
<APPREC-INCREASE-CURRENT>                   64,530,904
<NET-CHANGE-FROM-OPS>                       72,316,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,912,466
<NUMBER-OF-SHARES-REDEEMED>                  1,415,665
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     160,921,991
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,630,794)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          707,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,681,000
<AVERAGE-NET-ASSETS>                        26,742,000
<PER-SHARE-NAV-BEGIN>                           10.510
<PER-SHARE-NII>                                (0.200)
<PER-SHARE-GAIN-APPREC>                         11.510
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             21.820
<EXPENSE-RATIO>                                  1.910


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 18
   <NAME> MAINSTAY SMALL CAP GROWTH FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-01-1999
<INVESTMENTS-AT-COST>                      135,737,814
<INVESTMENTS-AT-VALUE>                     203,972,381
<RECEIVABLES>                                2,216,767
<ASSETS-OTHER>                                  56,466
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             206,245,614
<PAYABLE-FOR-SECURITIES>                     8,850,451
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      405,549
<TOTAL-LIABILITIES>                          9,256,000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   122,586,973
<SHARES-COMMON-STOCK>                        6,056,204
<SHARES-COMMON-PRIOR>                        1,983,138
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      6,168,074
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    68,234,567
<NET-ASSETS>                               196,989,614
<DIVIDEND-INCOME>                               31,251
<INTEREST-INCOME>                              269,980
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,681,386)
<NET-INVESTMENT-INCOME>                    (1,380,155)
<REALIZED-GAINS-CURRENT>                     9,165,533
<APPREC-INCREASE-CURRENT>                   64,530,904
<NET-CHANGE-FROM-OPS>                       72,316,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      5,003,130
<NUMBER-OF-SHARES-REDEEMED>                    930,064
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     160,921,991
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,630,794)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          707,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,681,000
<AVERAGE-NET-ASSETS>                        43,632,000
<PER-SHARE-NAV-BEGIN>                           10.460
<PER-SHARE-NII>                                (0.300)
<PER-SHARE-GAIN-APPREC>                         11.390
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             21.550
<EXPENSE-RATIO>                                  2.660


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 18
   <NAME> MAINSTAY SMALL CAP GROWTH FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      135,737,814
<INVESTMENTS-AT-VALUE>                     203,972,381
<RECEIVABLES>                                2,216,767
<ASSETS-OTHER>                                  56,466
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             206,245,614
<PAYABLE-FOR-SECURITIES>                     8,850,451
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      405,549
<TOTAL-LIABILITIES>                          9,256,000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   122,586,973
<SHARES-COMMON-STOCK>                           94,311
<SHARES-COMMON-PRIOR>                               63
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      6,168,074
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    68,234,567
<NET-ASSETS>                               196,989,614
<DIVIDEND-INCOME>                               31,251
<INTEREST-INCOME>                              269,980
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,681,386)
<NET-INVESTMENT-INCOME>                    (1,380,155)
<REALIZED-GAINS-CURRENT>                     9,165,533
<APPREC-INCREASE-CURRENT>                   64,530,904
<NET-CHANGE-FROM-OPS>                       72,316,282
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        100,744
<NUMBER-OF-SHARES-REDEEMED>                      6,496
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     160,921,991
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,630,794)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          707,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,681,000
<AVERAGE-NET-ASSETS>                           354,000
<PER-SHARE-NAV-BEGIN>                           10.460
<PER-SHARE-NII>                                 (0300)
<PER-SHARE-GAIN-APPREC>                         11.390
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             21.550
<EXPENSE-RATIO>                                  2.660


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 6
   <NAME> MAINSTAY SMALL CAP VALUE FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       29,655,474
<INVESTMENTS-AT-VALUE>                      31,345,587
<RECEIVABLES>                                  268,256
<ASSETS-OTHER>                                  76,786
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              31,690,629
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      129,168
<TOTAL-LIABILITIES>                            129,168
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    30,484,703
<SHARES-COMMON-STOCK>                        1,590,020
<SHARES-COMMON-PRIOR>                        1,366,325
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (654,314)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,690,113
<NET-ASSETS>                                31,520,502
<DIVIDEND-INCOME>                              362,323
<INTEREST-INCOME>                               64,435
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (637,256)
<NET-INVESTMENT-INCOME>                      (210,498)
<REALIZED-GAINS-CURRENT>                       174,014
<APPREC-INCREASE-CURRENT>                    1,788,220
<NET-CHANGE-FROM-OPS>                        1,751,736
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        400,658
<NUMBER-OF-SHARES-REDEEMED>                    180,318
<SHARES-REINVESTED>                              3,355
<NET-CHANGE-IN-ASSETS>                       8,880,640
<ACCUMULATED-NII-PRIOR>                          7,614
<ACCUMULATED-GAINS-PRIOR>                    (598,651)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          280,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                725,000
<AVERAGE-NET-ASSETS>                        13,764,031
<PER-SHARE-NAV-BEGIN>                            9.030
<PER-SHARE-NII>                                (0.030)
<PER-SHARE-GAIN-APPREC>                          0.580
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.020)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.560
<EXPENSE-RATIO>                                  1.900


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 6
   <NAME> MAINSTAY SMALL CAP VALUE FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       29,655,474
<INVESTMENTS-AT-VALUE>                      31,345,587
<RECEIVABLES>                                  268,256
<ASSETS-OTHER>                                  76,786
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              31,690,629
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      129,168
<TOTAL-LIABILITIES>                            129,168
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    30,484,703
<SHARES-COMMON-STOCK>                        1,661,928
<SHARES-COMMON-PRIOR>                        1,127,175
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (654,314)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,690,113
<NET-ASSETS>                                31,520,502
<DIVIDEND-INCOME>                              362,323
<INTEREST-INCOME>                               64,435
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (637,256)
<NET-INVESTMENT-INCOME>                      (210,498)
<REALIZED-GAINS-CURRENT>                       174,014
<APPREC-INCREASE-CURRENT>                    1,788,220
<NET-CHANGE-FROM-OPS>                        1,751,736
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        959,616
<NUMBER-OF-SHARES-REDEEMED>                    428,393
<SHARES-REINVESTED>                              3,530
<NET-CHANGE-IN-ASSETS>                       8,880,640
<ACCUMULATED-NII-PRIOR>                          7,614
<ACCUMULATED-GAINS-PRIOR>                    (598,651)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          280,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                725,000
<AVERAGE-NET-ASSETS>                        13,753,662
<PER-SHARE-NAV-BEGIN>                            9.000
<PER-SHARE-NII>                                (0.100)
<PER-SHARE-GAIN-APPREC>                          0.580
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.020)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.460
<EXPENSE-RATIO>                                  2.650


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 6
   <NAME> MAINSTAY SMALL CAP VALUE FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       29,655,474
<INVESTMENTS-AT-VALUE>                      31,345,587
<RECEIVABLES>                                  268,256
<ASSETS-OTHER>                                  76,786
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              31,690,629
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      129,168
<TOTAL-LIABILITIES>                            129,168
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    30,484,703
<SHARES-COMMON-STOCK>                           67,005
<SHARES-COMMON-PRIOR>                           21,808
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (654,314)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,690,113
<NET-ASSETS>                                31,520,502
<DIVIDEND-INCOME>                              362,323
<INTEREST-INCOME>                               64,435
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (637,256)
<NET-INVESTMENT-INCOME>                      (210,198)
<REALIZED-GAINS-CURRENT>                       174,014
<APPREC-INCREASE-CURRENT>                    1,788,736
<NET-CHANGE-FROM-OPS>                        1,751,736
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         59,641
<NUMBER-OF-SHARES-REDEEMED>                     14,519
<SHARES-REINVESTED>                                 75
<NET-CHANGE-IN-ASSETS>                       8,880,640
<ACCUMULATED-NII-PRIOR>                          7,614
<ACCUMULATED-GAINS-PRIOR>                    (598,651)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          280,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                725,000
<AVERAGE-NET-ASSETS>                           444,561
<PER-SHARE-NAV-BEGIN>                            9.000
<PER-SHARE-NII>                                (0.100)
<PER-SHARE-GAIN-APPREC>                          0.580
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.020)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.460
<EXPENSE-RATIO>                                  2.650


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS, INC.
<SERIES>
   <NUMBER> 20
   <NAME> MAINSTAY BLUE CHIP GROWTH FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      220,388,933
<INVESTMENTS-AT-VALUE>                     294,575,647
<RECEIVABLES>                                2,380,677
<ASSETS-OTHER>                                  46,849
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             297,003,173
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      639,741
<TOTAL-LIABILITIES>                            639,741
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   221,453,745
<SHARES-COMMON-STOCK>                        4,019,760
<SHARES-COMMON-PRIOR>                        1,663,458
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        722,973
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    74,186,714
<NET-ASSETS>                               296,363,432
<DIVIDEND-INCOME>                              974,643
<INTEREST-INCOME>                              148,339
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (3,549,616)
<NET-INVESTMENT-INCOME>                    (2,426,634)
<REALIZED-GAINS-CURRENT>                     1,764,358
<APPREC-INCREASE-CURRENT>                   65,187,327
<NET-CHANGE-FROM-OPS>                       64,525,051
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,767,379
<NUMBER-OF-SHARES-REDEEMED>                    411,077
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     238,404,857
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,523,000)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,523,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,550,000
<AVERAGE-NET-ASSETS>                        35,682,385
<PER-SHARE-NAV-BEGIN>                           11.640
<PER-SHARE-NII>                                (0.130)
<PER-SHARE-GAIN-APPREC>                          4.990
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             16.500
<EXPENSE-RATIO>                                  1.760


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 20
   <NAME> MAINSTAY BLUE CHIP GROWTH FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      220,388,933
<INVESTMENTS-AT-VALUE>                     294,575,647
<RECEIVABLES>                                2,380,677
<ASSETS-OTHER>                                  46,849
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             297,003,173
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      639,741
<TOTAL-LIABILITIES>                            639,741
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   221,453,745
<SHARES-COMMON-STOCK>                       13,653,274
<SHARES-COMMON-PRIOR>                        3,316,938
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        722,973
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    74,186,714
<NET-ASSETS>                               296,363,432
<DIVIDEND-INCOME>                              974,643
<INTEREST-INCOME>                              148,339
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (3,549,616)
<NET-INVESTMENT-INCOME>                    (2,426,634)
<REALIZED-GAINS-CURRENT>                     1,764,358
<APPREC-INCREASE-CURRENT>                   65,187,327
<NET-CHANGE-FROM-OPS>                       64,525,051
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     11,866,065
<NUMBER-OF-SHARES-REDEEMED>                  1,529,729
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     238,404,857
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,041,385)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,523,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,550,000
<AVERAGE-NET-ASSETS>                       114,449,629
<PER-SHARE-NAV-BEGIN>                           11.600
<PER-SHARE-NII>                                (0.230)
<PER-SHARE-GAIN-APPREC>                          4.960
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             16.330
<EXPENSE-RATIO>                                  2.510


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 20
   <NAME> MAINSTAY BLUE CHIP GROWTH FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                      220,388,933
<INVESTMENTS-AT-VALUE>                     294,575,647
<RECEIVABLES>                                2,380,677
<ASSETS-OTHER>                                  46,849
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             297,003,173
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      639,741
<TOTAL-LIABILITIES>                            639,741
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   221,453,745
<SHARES-COMMON-STOCK>                          436,874
<SHARES-COMMON-PRIOR>                           10,327
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        722,973
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    74,186,714
<NET-ASSETS>                               296,363,432
<DIVIDEND-INCOME>                              974,643
<INTEREST-INCOME>                              148,339
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (3,549,616)
<NET-INVESTMENT-INCOME>                    (2,426,634)
<REALIZED-GAINS-CURRENT>                     1,764,358
<APPREC-INCREASE-CURRENT>                   65,187,327
<NET-CHANGE-FROM-OPS>                       64,525,051
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        443,572
<NUMBER-OF-SHARES-REDEEMED>                     17,025
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     238,404,857
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                  (1,041,385)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,523,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,550,000
<AVERAGE-NET-ASSETS>                         2,130,292
<PER-SHARE-NAV-BEGIN>                           11.600
<PER-SHARE-NII>                                (0.230)
<PER-SHARE-GAIN-APPREC>                          4.960
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             16.330
<EXPENSE-RATIO>                                  2.510


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 21
   <NAME> MAINSTAY EQUITY INCOME FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       43,272,317
<INVESTMENTS-AT-VALUE>                      44,063,029
<RECEIVABLES>                                  581,049
<ASSETS-OTHER>                                  50,945
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              44,695,023
<PAYABLE-FOR-SECURITIES>                     1,172,409
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      131,331
<TOTAL-LIABILITIES>                          1,303,740
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    41,774,259
<SHARES-COMMON-STOCK>                        1,588,299
<SHARES-COMMON-PRIOR>                        1,004,199
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        826,312
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       790,712
<NET-ASSETS>                                43,391,283
<DIVIDEND-INCOME>                              821,328
<INTEREST-INCOME>                              156,507
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (547,993)
<NET-INVESTMENT-INCOME>                        429,842
<REALIZED-GAINS-CURRENT>                     2,946,162
<APPREC-INCREASE-CURRENT>                      795,505
<NET-CHANGE-FROM-OPS>                        4,171,509
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (269,644)
<DISTRIBUTIONS-OF-GAINS>                   (1,093,105)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        598,421
<NUMBER-OF-SHARES-REDEEMED>                    115,298
<SHARES-REINVESTED>                            100,977
<NET-CHANGE-IN-ASSETS>                      28,935,044
<ACCUMULATED-NII-PRIOR>                          3,420
<ACCUMULATED-GAINS-PRIOR>                      419,282
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          191,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                594,000
<AVERAGE-NET-ASSETS>                        14,097,000
<PER-SHARE-NAV-BEGIN>                           10.250
<PER-SHARE-NII>                                  0.230
<PER-SHARE-GAIN-APPREC>                          2.290
<PER-SHARE-DIVIDEND>                           (0.220)
<PER-SHARE-DISTRIBUTIONS>                      (0.740)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             11.810
<EXPENSE-RATIO>                                  1.650


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 21
   <NAME> MAINSTAY EQUITY INCOME FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       43,272,317
<INVESTMENTS-AT-VALUE>                      44,063,029
<RECEIVABLES>                                  581,049
<ASSETS-OTHER>                                  50,945
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              44,695,023
<PAYABLE-FOR-SECURITIES>                     1,172,409
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      131,331
<TOTAL-LIABILITIES>                          1,303,740
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    41,774,259
<SHARES-COMMON-STOCK>                        2,020,019
<SHARES-COMMON-PRIOR>                          407,002
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        826,312
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       790,712
<NET-ASSETS>                                43,391,283
<DIVIDEND-INCOME>                              821,328
<INTEREST-INCOME>                              156,507
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (547,993)
<NET-INVESTMENT-INCOME>                        429,842
<REALIZED-GAINS-CURRENT>                     2,946,162
<APPREC-INCREASE-CURRENT>                      795,505
<NET-CHANGE-FROM-OPS>                        4,171,509
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (171,600)
<DISTRIBUTIONS-OF-GAINS>                   (1,397,249)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,888,103
<NUMBER-OF-SHARES-REDEEMED>                    406,731
<SHARES-REINVESTED>                            131,645
<NET-CHANGE-IN-ASSETS>                      28,935,044
<ACCUMULATED-NII-PRIOR>                          3,420
<ACCUMULATED-GAINS-PRIOR>                      419,282
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          191,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                594,000
<AVERAGE-NET-ASSETS>                        12,852,000
<PER-SHARE-NAV-BEGIN>                           10.240
<PER-SHARE-NII>                                  0.130
<PER-SHARE-GAIN-APPREC>                          2.300
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                      (0.740)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             11.780
<EXPENSE-RATIO>                                  2.400


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 21
   <NAME> MAINSTAY EQUITY INCOME FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       43,272,317
<INVESTMENTS-AT-VALUE>                      44,063,029
<RECEIVABLES>                                  581,049
<ASSETS-OTHER>                                  50,945
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              44,695,023
<PAYABLE-FOR-SECURITIES>                     1,172,409
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      131,331
<TOTAL-LIABILITIES>                          1,303,740
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    41,774,259
<SHARES-COMMON-STOCK>                           69,925
<SHARES-COMMON-PRIOR>                               33
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        826,312
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       790,712
<NET-ASSETS>                                43,391,283
<DIVIDEND-INCOME>                              821,328
<INTEREST-INCOME>                              156,507
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (547,993)
<NET-INVESTMENT-INCOME>                        429,842
<REALIZED-GAINS-CURRENT>                     2,946,162
<APPREC-INCREASE-CURRENT>                      795,505
<NET-CHANGE-FROM-OPS>                        4,171,509
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (3,987)
<DISTRIBUTIONS-OF-GAINS>                      (50,299)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         81,743
<NUMBER-OF-SHARES-REDEEMED>                     16,213
<SHARES-REINVESTED>                              4,362
<NET-CHANGE-IN-ASSETS>                      28,935,044
<ACCUMULATED-NII-PRIOR>                          3,420
<ACCUMULATED-GAINS-PRIOR>                      419,282
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          191,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                594,000
<AVERAGE-NET-ASSETS>                           298,000
<PER-SHARE-NAV-BEGIN>                           10.240
<PER-SHARE-NII>                                  0.130
<PER-SHARE-GAIN-APPREC>                          2.300
<PER-SHARE-DIVIDEND>                           (0.150)
<PER-SHARE-DISTRIBUTIONS>                      (0.740)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             11.780
<EXPENSE-RATIO>                                  2.400


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 22
   <NAME> MAINSTAY GROWTH OPPORTUNITIES FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       67,109,319
<INVESTMENTS-AT-VALUE>                      85,712,398
<RECEIVABLES>                                  401,745
<ASSETS-OTHER>                                  53,602
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              86,167,745
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      210,184
<TOTAL-LIABILITIES>                            210,184
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    66,502,985
<SHARES-COMMON-STOCK>                        1,705,266
<SHARES-COMMON-PRIOR>                        1,120,585
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        851,497
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    18,603,079
<NET-ASSETS>                                85,957,561
<DIVIDEND-INCOME>                              418,988
<INTEREST-INCOME>                              334,653
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,096,836)
<NET-INVESTMENT-INCOME>                      (343,195)
<REALIZED-GAINS-CURRENT>                     1,172,657
<APPREC-INCREASE-CURRENT>                   14,864,752
<NET-CHANGE-FROM-OPS>                       15,694,214
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                      (14,335)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        752,820
<NUMBER-OF-SHARES-REDEEMED>                    169,098
<SHARES-REINVESTED>                                959
<NET-CHANGE-IN-ASSETS>                      60,313,445
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (274,313)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          370,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,097,000
<AVERAGE-NET-ASSETS>                        18,488,440
<PER-SHARE-NAV-BEGIN>                           11.860
<PER-SHARE-NII>                                (0.020)
<PER-SHARE-GAIN-APPREC>                          3.540
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.010)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             15.370
<EXPENSE-RATIO>                                  1.590


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 22
   <NAME> MAINSTAY GROWTH OPPORTUNITIES FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       67,109,319
<INVESTMENTS-AT-VALUE>                      85,712,398
<RECEIVABLES>                                  401,745
<ASSETS-OTHER>                                  53,602
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              86,167,745
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      210,184
<TOTAL-LIABILITIES>                            210,184
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    66,502,985
<SHARES-COMMON-STOCK>                        3,880,775
<SHARES-COMMON-PRIOR>                        1,046,275
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        851,497
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    18,603,079
<NET-ASSETS>                                85,957,561
<DIVIDEND-INCOME>                              418,988
<INTEREST-INCOME>                              334,653
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,096,836)
<NET-INVESTMENT-INCOME>                      (343,195)
<REALIZED-GAINS-CURRENT>                     1,172,657
<APPREC-INCREASE-CURRENT>                   14,864,752
<NET-CHANGE-FROM-OPS>                       15,694,214
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                      (32,104)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,338,377
<NUMBER-OF-SHARES-REDEEMED>                    506,021
<SHARES-REINVESTED>                              2,144
<NET-CHANGE-IN-ASSETS>                      60,313,445
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (274,313)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          370,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,097,000
<AVERAGE-NET-ASSETS>                        34,089,774
<PER-SHARE-NAV-BEGIN>                           11.800
<PER-SHARE-NII>                                (0.110)
<PER-SHARE-GAIN-APPREC>                          3.510
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.010)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             15.190
<EXPENSE-RATIO>                                  2.340


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 22
   <NAME> MAINSTAY GROWTH OPPORTUNITIES FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       67,109,319
<INVESTMENTS-AT-VALUE>                      85,712,398
<RECEIVABLES>                                  401,745
<ASSETS-OTHER>                                  53,602
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              86,167,745
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      210,184
<TOTAL-LIABILITIES>                            210,184
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    66,502,985
<SHARES-COMMON-STOCK>                           53,063
<SHARES-COMMON-PRIOR>                               32
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        851,497
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    18,603,079
<NET-ASSETS>                                85,957,561
<DIVIDEND-INCOME>                              418,988
<INTEREST-INCOME>                              334,653
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,096,836)
<NET-INVESTMENT-INCOME>                      (343,195)
<REALIZED-GAINS-CURRENT>                     1,172,657
<APPREC-INCREASE-CURRENT>                   14,864,752
<NET-CHANGE-FROM-OPS>                       15,694,214
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                         (408)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         56,113
<NUMBER-OF-SHARES-REDEEMED>                      3,109
<SHARES-REINVESTED>                                 27
<NET-CHANGE-IN-ASSETS>                      60,313,445
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (274,313)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          370,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,097,000
<AVERAGE-NET-ASSETS>                           226,449
<PER-SHARE-NAV-BEGIN>                           11.800
<PER-SHARE-NII>                                (0.110)
<PER-SHARE-GAIN-APPREC>                          3.510
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.010)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             15.190
<EXPENSE-RATIO>                                  2.340


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 23
   <NAME> MAINSTAY RESEARCH VALUE FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                          987,614
<INVESTMENTS-AT-VALUE>                      25,238,718
<RECEIVABLES>                                  124,866
<ASSETS-OTHER>                                  46,465
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              25,410,049
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      100,096
<TOTAL-LIABILITIES>                            100,096
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    22,409,477
<SHARES-COMMON-STOCK>                          886,168
<SHARES-COMMON-PRIOR>                          447,712
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (372,520)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     3,251,104
<NET-ASSETS>                                25,309,953
<DIVIDEND-INCOME>                              248,157
<INTEREST-INCOME>                               46,578
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (421,046)
<NET-INVESTMENT-INCOME>                      (126,311)
<REALIZED-GAINS-CURRENT>                     1,343,606
<APPREC-INCREASE-CURRENT>                    2,061,596
<NET-CHANGE-FROM-OPS>                        3,278,891
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        485,529
<NUMBER-OF-SHARES-REDEEMED>                     85,017
<SHARES-REINVESTED>                             37,944
<NET-CHANGE-IN-ASSETS>                      10,204,963
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (464,079)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          171,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                489,000
<AVERAGE-NET-ASSETS>                         7,319,979
<PER-SHARE-NAV-BEGIN>                           10.250
<PER-SHARE-NII>                                (0.090)
<PER-SHARE-GAIN-APPREC>                          1.870
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.550)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             11.480
<EXPENSE-RATIO>                                  2.550


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 23
   <NAME> MAINSTAY RESEARCH VALUE FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                          987,614
<INVESTMENTS-AT-VALUE>                      25,238,718
<RECEIVABLES>                                  124,866
<ASSETS-OTHER>                                  46,465
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              25,410,049
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      100,096
<TOTAL-LIABILITIES>                            100,096
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    22,409,477
<SHARES-COMMON-STOCK>                           99,836
<SHARES-COMMON-PRIOR>                           13,464
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (372,520)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     3,251,104
<NET-ASSETS>                                25,309,953
<DIVIDEND-INCOME>                              248,157
<INTEREST-INCOME>                               46,578
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (421,046)
<NET-INVESTMENT-INCOME>                      (126,311)
<REALIZED-GAINS-CURRENT>                     1,343,606
<APPREC-INCREASE-CURRENT>                    2,061,596
<NET-CHANGE-FROM-OPS>                        3,278,891
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         86,289
<NUMBER-OF-SHARES-REDEEMED>                      3,438
<SHARES-REINVESTED>                              3,521
<NET-CHANGE-IN-ASSETS>                      10,204,963
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (464,079)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          171,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                489,000
<AVERAGE-NET-ASSETS>                           643,032
<PER-SHARE-NAV-BEGIN>                           10.250
<PER-SHARE-NII>                                (0.090)
<PER-SHARE-GAIN-APPREC>                          1.870
<PER-SHARE-DIVIDEND>                             0.000
<PER-SHARE-DISTRIBUTIONS>                      (0.550)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             11.480
<EXPENSE-RATIO>                                  2.550


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 24
   <NAME> MAINSTAY GLOBAL HIGH YIELD - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       11,113,041
<INVESTMENTS-AT-VALUE>                      11,767,094
<RECEIVABLES>                                  273,990
<ASSETS-OTHER>                                 203,496
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              12,244,580
<PAYABLE-FOR-SECURITIES>                       150,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       72,988
<TOTAL-LIABILITIES>                            222,988
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    13,388,389
<SHARES-COMMON-STOCK>                          954,639
<SHARES-COMMON-PRIOR>                          944,020
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,020,850)
<ACCUM-APPREC-OR-DEPREC>                       654,053
<NET-ASSETS>                                12,021,592
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,211,400
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (206,365)
<NET-INVESTMENT-INCOME>                      1,005,035
<REALIZED-GAINS-CURRENT>                     (740,048)
<APPREC-INCREASE-CURRENT>                    1,562,334
<NET-CHANGE-FROM-OPS>                        1,827,321
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (739,975)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         54,959
<NUMBER-OF-SHARES-REDEEMED>                   (47,878)
<SHARES-REINVESTED>                              3,538
<NET-CHANGE-IN-ASSETS>                       1,176,529
<ACCUMULATED-NII-PRIOR>                          1,284
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (1,272,491)
<GROSS-ADVISORY-FEES>                           37,600
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                323,000
<AVERAGE-NET-ASSETS>                        10,749,000
<PER-SHARE-NAV-BEGIN>                            8.000
<PER-SHARE-NII>                                  0.780
<PER-SHARE-GAIN-APPREC>                          0.590
<PER-SHARE-DIVIDEND>                           (0.790)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.580
<EXPENSE-RATIO>                                  1.700


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 24
   <NAME> MAINSTAY GLOBAL HIGH YIELD - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       11,113,041
<INVESTMENTS-AT-VALUE>                      11,767,094
<RECEIVABLES>                                  273,990
<ASSETS-OTHER>                                 203,496
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              12,244,580
<PAYABLE-FOR-SECURITIES>                       150,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       72,988
<TOTAL-LIABILITIES>                            222,988
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    13,388,389
<SHARES-COMMON-STOCK>                          439,859
<SHARES-COMMON-PRIOR>                          317,320
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,020,850)
<ACCUM-APPREC-OR-DEPREC>                       654,053
<NET-ASSETS>                                12,021,592
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,211,400
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (206,365)
<NET-INVESTMENT-INCOME>                      1,005,035
<REALIZED-GAINS-CURRENT>                     (740,048)
<APPREC-INCREASE-CURRENT>                    1,562,334
<NET-CHANGE-FROM-OPS>                        1,827,321
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (285,613)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        163,177
<NUMBER-OF-SHARES-REDEEMED>                   (55,682)
<SHARES-REINVESTED>                             15,044
<NET-CHANGE-IN-ASSETS>                       2,522,560
<ACCUMULATED-NII-PRIOR>                          1,284
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                 (1,272,491)
<GROSS-ADVISORY-FEES>                           37,600
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                323,000
<AVERAGE-NET-ASSETS>                        10,749,000
<PER-SHARE-NAV-BEGIN>                            7.980
<PER-SHARE-NII>                                  0.710
<PER-SHARE-GAIN-APPREC>                          0.570
<PER-SHARE-DIVIDEND>                           (0.720)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.540
<EXPENSE-RATIO>                                  2.450


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> THE MAINSTAY FUNDS
<SERIES>
   <NUMBER> 24
   <NAME> MAINSTAY GLOBAL HIGH YIELD - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       11,113,041
<INVESTMENTS-AT-VALUE>                      11,767,094
<RECEIVABLES>                                  273,990
<ASSETS-OTHER>                                 203,496
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              12,244,580
<PAYABLE-FOR-SECURITIES>                       150,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       72,988
<TOTAL-LIABILITIES>                            222,988
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    13,388,389
<SHARES-COMMON-STOCK>                            9,267
<SHARES-COMMON-PRIOR>                               51
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                   (2,020,850)
<ACCUM-APPREC-OR-DEPREC>                       654,053
<NET-ASSETS>                                12,021,592
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,211,400
<OTHER-INCOME>                                       0
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<REALIZED-GAINS-CURRENT>                     (740,048)
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<NET-CHANGE-FROM-OPS>                        1,827,321
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (3,998)
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<NUMBER-OF-SHARES-REDEEMED>                    (1,838)
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<NET-CHANGE-IN-ASSETS>                       1,896,876
<ACCUMULATED-NII-PRIOR>                          1,284
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<GROSS-EXPENSE>                                323,000
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<PER-SHARE-NAV-BEGIN>                            7.980
<PER-SHARE-NII>                                  0.710
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<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              8.540
<EXPENSE-RATIO>                                  2.450


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 25
   <NAME> MAINSTAY MAP EQUITY FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JUN-09-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       64,566,870
<INVESTMENTS-AT-VALUE>                      86,658,500
<RECEIVABLES>                                  283,299
<ASSETS-OTHER>                                  22,412
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<PAYABLE-FOR-SECURITIES>                       720,032
<SENIOR-LONG-TERM-DEBT>                              0
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    62,907,682
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<DIVIDEND-INCOME>                              760,892
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<NET-INVESTMENT-INCOME>                        260,275
<REALIZED-GAINS-CURRENT>                     4,098,524
<APPREC-INCREASE-CURRENT>                    4,226,445
<NET-CHANGE-FROM-OPS>                        8,585,244
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (11,898)
<DISTRIBUTIONS-OF-GAINS>                     (310,408)
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<NUMBER-OF-SHARES-REDEEMED>                   (35,078)
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<NET-CHANGE-IN-ASSETS>                      25,684,860
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<EXPENSE-RATIO>                                  1.250


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 25
   <NAME> MAINSTAY MAP EQUITY FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JUN-09-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                       64,566,870
<INVESTMENTS-AT-VALUE>                      86,658,500
<RECEIVABLES>                                  283,299
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<PAYABLE-FOR-SECURITIES>                       720,032
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      145,076
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    62,907,682
<SHARES-COMMON-STOCK>                          440,249
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<DIVIDEND-INCOME>                              760,892
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<REALIZED-GAINS-CURRENT>                     4,098,524
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<NET-CHANGE-FROM-OPS>                        8,585,244
<EQUALIZATION>                                       0
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<ACCUMULATED-NII-PRIOR>                         45,300
<ACCUMULATED-GAINS-PRIOR>                      483,487
<OVERDISTRIB-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                                   0
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<EXPENSE-RATIO>                                   2.00


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 25
   <NAME> MAINSTAY MAP EQUITY FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JUN-09-1999
<PERIOD-END>                               DEC-31-1999
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    62,907,682
<SHARES-COMMON-STOCK>                           94,785
<SHARES-COMMON-PRIOR>                                0
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<DIVIDEND-INCOME>                              760,892
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<APPREC-INCREASE-CURRENT>                    4,226,445
<NET-CHANGE-FROM-OPS>                        8,585,244
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (222)
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<NUMBER-OF-SHARES-REDEEMED>                    (1,098)
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<NET-CHANGE-IN-ASSETS>                      25,684,860
<ACCUMULATED-NII-PRIOR>                         45,300
<ACCUMULATED-GAINS-PRIOR>                      483,487
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<AVERAGE-NET-ASSETS>                        74,855,000
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<EXPENSE-RATIO>                                   2.00


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000787441
<NAME> MAINSTAY FUNDS INC.
<SERIES>
   <NUMBER> 25
   <NAME> MAINSTAY MAP EQUITY FUND - CLASS I
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<PERIOD-START>                             JAN-01-1999
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<SENIOR-EQUITY>                                      0
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<SHARES-COMMON-STOCK>                        2,417,670
<SHARES-COMMON-PRIOR>                        2,457,556
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<NET-ASSETS>                                86,099,103
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<REALIZED-GAINS-CURRENT>                     4,098,524
<APPREC-INCREASE-CURRENT>                    4,226,445
<NET-CHANGE-FROM-OPS>                        8,585,244
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (269,185)
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<NUMBER-OF-SHARES-REDEEMED>                  (701,360)
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<NET-CHANGE-IN-ASSETS>                      25,684,860
<ACCUMULATED-NII-PRIOR>                         45,300
<ACCUMULATED-GAINS-PRIOR>                      483,487
<OVERDISTRIB-NII-PRIOR>                              0
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<EXPENSE-RATIO>                                  0.880


</TABLE>


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