<PAGE>
000 A000000 12/31/96
000 C000000 0000932281
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 A
001 A000000 U.S. MONEY MARKET PORTFOLIO
001 B000000 811-8842
001 C000000 8099494719
002 A000000 BUTTERFIELD HOUSE, FORT STREET, BOX 2330
002 B000000 GEORGE TOWN
002 E010000 CAYMAN ISLANDS, BWI
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
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
008 A000001 BROWN BROTHERS HARRIMAN & CO
008 B000001 A
008 C000001 801-0000
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10005
010 A000001 BROWN BROTHERS HARRIMAN TRUST CO (CAYMAN) LTD
010 C010001 GEORGE TOWN
010 C050001 CAYMAN ISLANDS, BWI
013 A000001 DELOITTE & TOUCHE
013 B010001 GEORGE TOWN
013 B050001 CAYMAN ISLANDS
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02101
015 E010001 X
018 000000 Y
019 A000000 Y
<PAGE>
019 B000000 11
019 C000000 59 WALL ST
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 BANKERS TRUST
022 B000001 13-4941247
022 C000001 7196287
022 D000001 49998
022 A000002 CITIBANK
022 B000002 13-3039426
022 C000002 5703952
022 D000002 0
022 A000003 CS FIRST BOSTON
022 B000003 13-5659485
022 C000003 5154798
022 D000003 0
022 A000004 MONGAN STANLEY
022 B000004 13-2655998
022 C000004 5138845
022 D000004 0
022 A000005 AUBREY LANSTON
022 B000005 13-5552129
022 C000005 2193000
022 D000005 0
022 A000006 SOLOMON BROS
022 B000006 13-3082694
022 C000006 2089000
022 D000006 0
022 A000007 FNB OF CHICAGO
022 B000007 36-0899825
022 C000007 1208831
022 D000007 0
022 A000008 JP MORGAN
022 B000008 13-3224016
022 C000008 828842
022 D000008 0
022 A000009 MERRILL LYNCH
022 B000009 13-5674085
022 C000009 543000
022 D000009 30113
022 A000010 BEAR STEARNS
022 B000010 13-3299429
<PAGE>
022 C000010 438000
022 D000010 0
023 C000000 31158469
023 D000000 80111
024 000000 N
025 D000001 0
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
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
028 A010000 79983
028 A020000 0
028 A030000 0
028 A040000 94795
028 B010000 80429
028 B020000 0
028 B030000 0
028 B040000 50338
028 C010000 46005
028 C020000 0
028 C030000 0
028 C040000 82321
028 D010000 87607
028 D020000 0
028 D030000 0
028 D040000 54174
028 E010000 51470
028 E020000 0
028 E030000 0
028 E040000 67137
028 F010000 146119
028 F020000 0
028 F030000 0
028 F040000 154461
028 G010000 491613
028 G020000 0
028 G030000 0
028 G040000 503226
<PAGE>
028 H000000 0
029 000000 N
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 N
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 0
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.150
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
<PAGE>
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 N
052 000000 Y
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 Y
054 G000000 N
054 H000000 N
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 Y
062 B000000 7.8
062 C000000 12.9
062 D000000 4.5
062 E000000 0.0
062 F000000 54.9
062 G000000 7.3
062 H000000 0.0
062 I000000 11.6
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 53
063 B000000 0.0
064 A000000 N
<PAGE>
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 Y
070 B010000 N
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 N
070 J020000 N
070 K010000 N
070 K020000 N
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 N
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 491815
071 B000000 503429
071 C000000 765920
071 D000000 64
072 A000000 6
072 B000000 21835
072 C000000 0
072 D000000 0
072 E000000 0
<PAGE>
072 F000000 601
072 G000000 140
072 H000000 0
072 I000000 0
072 J000000 107
072 K000000 0
072 L000000 0
072 M000000 14
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 0
072 S000000 0
072 T000000 0
072 U000000 9
072 V000000 0
072 W000000 69
072 X000000 940
072 Y000000 0
072 Z000000 20895
072AA000000 0
072BB000000 0
072CC010000 0
072CC020000 0
072DD010000 0
072DD020000 0
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 0
074 B000000 20000
074 C000000 746306
074 D000000 0
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 0
074 K000000 0
074 L000000 7749
074 M000000 48
074 N000000 774103
074 O000000 0
074 P000000 135
074 Q000000 0
074 R010000 0
074 R020000 0
<PAGE>
074 R030000 0
074 R040000 210
074 S000000 0
074 T000000 773758
074 U010000 0
074 U020000 0
074 V010000 0.00
074 V020000 0.00
074 W000000 0.0000
074 X000000 2
074 Y000000 0
075 A000000 794273
075 B000000 0
076 000000 0.00
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 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 CHUBB GROUP OF INSURANCE COMPANIES
080 C000000 2900
081 A000000 Y
081 B000000 11
082 A000000 Y
082 B000000 25
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
SIGNATURE SUSAN JAKUBOSKI
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary information extracted from the U. S. Money Market
Portfolio Annual Report, dated December 31, 1996, and is qualified in its
entirety by reference to such Annual Report.
</LEGEND>
<CIK> 0000932281
<NAME> U.S. MONEY MARKET PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUN-30-1997
<PERIOD-START> JUL-1-1996
<PERIOD-END> DEC-31-1996
<INVESTMENTS-AT-COST> 766,305,993
<INVESTMENTS-AT-VALUE> 766,305,996
<RECEIVABLES> 7,748,536
<ASSETS-OTHER> 48,277
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 774,102,806
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 345,199
<TOTAL-LIABILITIES> 345,199
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 773,757,607
<SHARES-COMMON-STOCK> 0
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 773,757,607
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 21,835,380
<OTHER-INCOME> 0
<EXPENSES-NET> 940,686
<NET-INVESTMENT-INCOME> 20,894,694
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 20,894,694
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 9,280,985
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 600,601
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 940,686
<AVERAGE-NET-ASSETS> 794,273,494
<PER-SHARE-NAV-BEGIN> 0
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 0
<EXPENSE-RATIO> 0.23
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
