MERRILL LYNCH RETIREMENT RESERVES MO FU OF MER LYN RE SER TR
NSAR-B, 1999-12-30
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<PAGE>      PAGE  1
000 B000000 10/31/1999
000 C000000 0000356013
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MERRILL LYNCH RETIREMENT SERIES TRUST
001 B000000 811-3310
001 C000000 6092822800
002 A000000 P.O. BOX 9011
002 B000000 PRINCETON
002 C000000 NJ
002 D010000 08543
002 D020000 9011
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  1
007 C010100  1
007 C020100 MERRILL LYNCH RETIREMENT RESERVES MONEY FUND
007 C030100 N
007 C010200  2
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 CREDIT SUISSE FIRST BOSTON CORPORATION
022 B000001 13-5659485
022 C000001  12443791
022 D000001    782337
022 A000002 GOLDMAN, SACHS & CO.
<PAGE>      PAGE  2
022 B000002 13-5108880
022 C000002  11202027
022 D000002    943238
022 A000003 LEHMAN BROTHERS COMMERCIAL PAPER
022 C000003  10451419
022 D000003    775457
022 A000004 LEHMAN BROTHERS INC.
022 B000004 13-2518466
022 C000004   6814064
022 D000004    702008
022 A000005 CHASE SECURITIES INC.
022 B000005 13-3112953
022 C000005   6250875
022 D000005    168895
022 A000006 HSBC SECURITIES (U.S.A.) INC.
022 B000006 13-2650272
022 C000006   5162024
022 D000006   1227082
022 A000007 SALOMON SMITH BARNEY INC.
022 B000007 11-2418191
022 C000007   4804257
022 D000007    398922
022 A000008 LANSTON (AUBREY G.) & CO. INC.
022 B000008 13-5552129
022 C000008   4313302
022 D000008    131503
022 A000009 MERRILL LYNCH MONEY MARKET SECURITIES, INC.
022 C000009   3854155
022 D000009    235584
022 A000010 GENERAL ELECTRIC CAPITAL CORP.
022 C000010   3913872
022 D000010         0
023 C000000   98403333
023 D000000    8225837
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
077 A000000 Y
077 B000000 Y
077 P000000 Y
078  000000 N
008 A000101 MERRILL LYNCH ASSET MANAGEMENT, L.P.
008 B000101 A
008 C000101 801-11583
<PAGE>      PAGE  3
008 D010101 PRINCETON
008 D020101 NJ
008 D030101 08543
008 D040101 9011
011 A000101 MERRILL LYNCH FUNDS DISTRIBUTOR, INC.
011 B000101 8-14663
011 C010101 PRINCETON
011 C020101 NJ
011 C030101 08543
011 C040101 9011
012 A000101 FINANCIAL DATA SERVICES, INC.
012 B000101 84-01339
012 C010101 JACKSONVILLE
012 C020101 FL
012 C030101 32246
012 C040101 6484
013 A000101 DELOITTE & TOUCHE LLP
013 B010101 PRINCETON
013 B020101 NJ
013 B030101 08540
014 A000101 MLPF&S AND OTHER ML BROKER/DEALER AFFILIATES
014 B000101 8-7221
015 A000101 THE BANK OF NEW YORK
015 B000101 C
015 C010101 NEW YORK
015 C020101 NY
015 C030101 10286
015 E010101 X
015 A000102 BANKERS TRUST COMPANY
015 B000102 S
015 C010102 NEW YORK
015 C020102 NY
015 C030102 10006
015 E010102 X
015 A000103 THE CHASE MANHATTAN BANK
015 B000103 S
015 C010103 NEW YORK
015 C020103 NY
015 C030103 10017
015 E010103 X
015 A000104 CUSTODIAL TRUST CO.
015 B000104 S
015 C010104 NEW YORK
015 C020104 NY
015 C030104 10167
015 E010104 X
015 A000105 MORGAN GUARANTY TRUST CO. OF NEW YORK
015 B000105 S
015 C010105 NEW YORK
015 C020105 NY
015 C030105 10260
<PAGE>      PAGE  4
015 E010105 X
018  000100 Y
019 A000100 Y
019 B000100  230
019 C000100 MERRILLLYN
024  000100 Y
025 A000101 GOLDMAN SACHS GROUP INC.
025 C000101 D
025 D000101  255377
025 A000102 SALOMON, SMITH BARNEY HOLDINGS, INC.
025 C000102 D
025 D000102  196058
025 A000103 MORGAN STANLEY, DEAN WITTER & CO.
025 C000103 D
025 D000103  125000
025 A000104 LEHMAN BROTHERS HOLDINGS INC.
025 C000104 D
025 D000104   39281
025 A000105 GOLDMAN SACHS GROUP, L.P.
025 C000105 D
025 D000105   25000
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100   4251991
028 A020100     50640
028 A030100         0
028 A040100   4215585
028 B010100   4269073
028 B020100     62014
028 B030100         0
028 B040100   4338923
028 C010100   4493838
028 C020100     58815
028 C030100         0
028 C040100   4188573
028 D010100   4300688
028 D020100     64369
028 D030100         0
028 D040100   4350301
028 E010100   3764820
028 E020100     62666
028 E030100         0
028 E040100   3921573
028 F010100   4147629
028 F020100     63538
028 F030100         0
028 F040100   4245447
028 G010100  25228039
028 G020100    362042
028 G030100         0
<PAGE>      PAGE  5
028 G040100  25260402
028 H000100         0
029  000100 N
030 A000100      0
030 B000100  0.00
030 C000100  0.00
034  000100 N
035  000100      0
036 B000100      0
037  000100 N
038  000100      0
039  000100 N
040  000100 Y
041  000100 Y
042 A000100   0
042 B000100   0
042 C000100 100
042 D000100   0
042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
043  000100   1741
044  000100      0
045  000100 Y
046  000100 N
047  000100 Y
048  000100  0.000
048 A010100  1000000
048 A020100 0.500
048 B010100  1000000
048 B020100 0.450
048 C010100  1000000
048 C020100 0.400
048 D010100  1000000
048 D020100 0.375
048 E010100  3000000
048 E020100 0.350
048 F010100  3000000
048 F020100 0.325
048 G010100  5000000
048 G020100 0.300
048 H010100        0
048 H020100 0.000
048 I010100        0
048 I020100 0.000
048 J010100        0
048 J020100 0.000
048 K010100 15000000
048 K020100 0.290
049  000100 N
<PAGE>      PAGE  6
050  000100 N
051  000100 N
052  000100 N
053 A000100 N
054 A000100 Y
054 B000100 Y
054 C000100 N
054 D000100 N
054 E000100 N
054 F000100 N
054 G000100 N
054 H000100 Y
054 I000100 N
054 J000100 Y
054 K000100 N
054 L000100 N
054 M000100 Y
054 N000100 N
055 A000100 N
055 B000100 N
056  000100 Y
057  000100 N
058 A000100 N
059  000100 Y
060 A000100 Y
060 B000100 Y
061  000100        1
062 A000100 Y
062 B000100   0.4
062 C000100  14.4
062 D000100   0.0
062 E000100   0.0
062 F000100   2.2
062 G000100  11.9
062 H000100   0.0
062 I000100  46.7
062 J000100   0.0
062 K000100   0.0
062 L000100  24.9
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  72
063 B000100  0.0
064 A000100 N
066 A000100 N
067  000100 N
068 A000100 N
<PAGE>      PAGE  7
068 B000100 N
069  000100 N
070 A010100 Y
070 A020100 Y
070 B010100 N
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 N
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
071 A000100         0
071 B000100         0
071 C000100         0
071 D000100    0
072 A000100 12
072 B000100   775791
072 C000100        0
072 D000100        0
072 E000100        0
072 F000100    51736
072 G000100      489
072 H000100        0
072 I000100    18119
<PAGE>      PAGE  8
072 J000100      591
072 K000100        0
072 L000100      523
072 M000100       79
072 N000100     2428
072 O000100        0
072 P000100       77
072 Q000100        0
072 R000100       35
072 S000100      168
072 T000100     1741
072 U000100        0
072 V000100        0
072 W000100      122
072 X000100    76108
072 Y000100        0
072 Z000100   699683
072AA000100      716
072BB000100      850
072CC010100        0
072CC020100    18652
072DD010100   659925
072DD020100    39624
072EE000100        0
073 A010100   0.0474
073 A020100   0.0454
073 B000100   0.0000
073 C000100   0.0000
074 A000100      101
074 B000100        0
074 C000100 15307698
074 D000100        0
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        0
074 L000100    87401
074 M000100      576
074 N000100 15395776
074 O000100        0
074 P000100     5338
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100   160678
074 S000100        0
074 T000100 15229760
<PAGE>      PAGE  9
074 U010100 13865025
074 U020100  1364735
074 V010100     1.00
074 V020100     1.00
074 W000100   0.0000
074 X000100  2428021
074 Y000100        0
075 A000100 13923906
075 B000100        0
076  000100     0.00
080 A000100 ICI MUTUAL INSURANCE CO.
080 C000100     2500
081 A000100 Y
081 B000100 150
082 A000100 N
082 B000100        0
083 A000100 N
083 B000100        0
084 A000100 N
084 B000100        0
085 A000100 N
SIGNATURE   DONALD C. BURKE
TITLE       TREASURER



<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000356013
<NAME> MERRILL LYNCH RETIREMENT SERIES TRUST
<SERIES>
   <NUMBER> 011
   <NAME> MERRILL LYNCH RETIREMENT RESERVES MONEY FUND

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-START>                             NOV-01-1998
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                      15321961249
<INVESTMENTS-AT-VALUE>                     15307697807
<RECEIVABLES>                                 87400842
<ASSETS-OTHER>                                  677037
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             15395775686
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    166016008
<TOTAL-LIABILITIES>                          166016008
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1524402312
<SHARES-COMMON-STOCK>                      13878271547
<SHARES-COMMON-PRIOR>                      13913317927
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (14263442)
<NET-ASSETS>                               13865024958
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            775791307
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (76107967)
<NET-INVESTMENT-INCOME>                      699683340
<REALIZED-GAINS-CURRENT>                      (134258)
<APPREC-INCREASE-CURRENT>                   (18651934)
<NET-CHANGE-FROM-OPS>                        680897148
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (659925475)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    43972818950
<NUMBER-OF-SHARES-REDEEMED>              (44667735705)
<SHARES-REINVESTED>                          659870375
<NET-CHANGE-IN-ASSETS>                      1255653415
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                         51735739
<INTEREST-EXPENSE>                               77251
<GROSS-EXPENSE>                               76107967
<AVERAGE-NET-ASSETS>                          13923906
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                    .05
<PER-SHARE-GAIN-APPREC>                          (.05)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .50



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000356013
<NAME> MERRILL LYNCH RETIREMENT SERIES TRUST
<SERIES>
   <NUMBER> 012
   <NAME> MERRILL LYNCH RETIREMENT RESERVES MONEY FUND

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-START>                             NOV-01-1998
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                      15321961249
<INVESTMENTS-AT-VALUE>                     15307697807
<RECEIVABLES>                                 87400842
<ASSETS-OTHER>                                  677037
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             15395775686
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    166016008
<TOTAL-LIABILITIES>                          166016008
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1524402312
<SHARES-COMMON-STOCK>                       1365751573
<SHARES-COMMON-PRIOR>                         56399845
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (14263442)
<NET-ASSETS>                                1364734720
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            775791307
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (76107967)
<NET-INVESTMENT-INCOME>                      699683340
<REALIZED-GAINS-CURRENT>                      (134258)
<APPREC-INCREASE-CURRENT>                   (18651934)
<NET-CHANGE-FROM-OPS>                        680897148
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (39623607)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     7590795757
<NUMBER-OF-SHARES-REDEEMED>               (6321058851)
<SHARES-REINVESTED>                           39614823
<NET-CHANGE-IN-ASSETS>                      1255653415
<ACCUMULATED-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                               77251
<GROSS-EXPENSE>                               76107967
<AVERAGE-NET-ASSETS>                         869578437
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                    .05
<PER-SHARE-GAIN-APPREC>                          (.05)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .71



</TABLE>


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