<PAGE> PAGE 1
000 B000000 12/31/96
000 C000000 0000812195
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 PIONEER MONEY MARKET TRUST
001 B000000 811-5099
001 C000000 6177427825
002 A000000 60 STATE STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02109
002 D020000 1801
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 1
007 C010100 1
007 C020100 PIONEER CASH RESERVES 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
008 A00AA01 PIONEERING MANAGEMENT CORPORATION
008 B00AA01 A
008 C00AA01 801-8255
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02109
008 D04AA01 1801
011 A00AA01 PIONEER FUNDS DISTRIBUTOR, INC.
011 B00AA01 8-41256
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
011 C04AA01 1801
012 A00AA01 PIONEERING SERVICES CORPORATION
012 B00AA01 84-1359
012 C01AA01 BOSTON
<PAGE> PAGE 2
012 C02AA01 MA
012 C03AA01 02109
012 C04AA01 1801
013 A00AA01 ARTHUR ANDERSEN LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
013 B04AA01 2604
015 A00AA01 BROWN BROTHERS HARRIMAN & CO.
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 C04AA01 1820
015 E01AA01 X
015 A00AA02 NATIONAL AUSTRALIA BANK
015 B00AA02 S
015 C01AA02 MELBOURNE 3000
015 D01AA02 AUSTRALIA
015 D02AA02 3000
015 E04AA02 X
015 A00AA03 CREDITANSTALT BANK VEREIN
015 B00AA03 S
015 C01AA03 VIENNA A-1090
015 D01AA03 AUSTRIA
015 D02AA03 A-1090
015 E04AA03 X
015 A00AA04 BANQUE BRUXELLES LAMBERT
015 B00AA04 S
015 C01AA04 BRUSSELS 1040
015 D01AA04 BELGIUM
015 D02AA04 1040
015 E04AA04 X
015 A00AA05 DEN DANSKE BANK, COPENHAGEN
015 B00AA05 S
015 C01AA05 COPENHAGEN
015 D01AA05 DENMARK
015 E04AA05 X
015 A00AA06 MERITA BANK
015 B00AA06 S
015 C01AA06 HELSINKI
015 D01AA06 FINLAND
015 E04AA06 X
015 A00AA07 BANQUE PARIBAS
015 B00AA07 S
015 C01AA07 PARIS 75001
015 D01AA07 FRANCE
015 D02AA07 75001
015 E04AA07 X
015 A00AA08 DRESDENER BANK
015 B00AA08 S
<PAGE> PAGE 3
015 C01AA08 FRANKFURT D-6000
015 D01AA08 GERMANY
015 D02AA08 D-6000
015 E04AA08 X
015 A00AA09 STANDARD CHARTERED BANK, HONG KONG
015 B00AA09 S
015 C01AA09 HONG KONG
015 D01AA09 HONG KONG
015 E04AA09 X
015 A00AA10 BANCA COMMERCIALE ITALIANA, MILAN
015 B00AA10 S
015 C01AA10 MILAN
015 D01AA10 ITALY
015 D02AA10 20121
015 E04AA10 X
015 A00AA11 THE SUMITOMO TRUST & BANKING CO. LTD.
015 B00AA11 S
015 C01AA11 TOKYO 100
015 D01AA11 JAPAN
015 D02AA11 100
015 E04AA11 X
015 A00AA12 CITIBANK, N.A.
015 B00AA12 S
015 C01AA12 SEOUL 110
015 D01AA12 KOREA
015 D02AA12 110
015 E04AA12 X
015 A00AA13 HONG KONG BANK MALAYSIA BERHAD
015 B00AA13 S
015 C01AA13 KUALA LAMPUR 50100
015 D01AA13 MALAYSIA
015 D02AA13 50100
015 E04AA13 X
015 A00AA14 CITIBANK MEXICO S.A.
015 B00AA14 S
015 C01AA14 MEXICO CITY
015 D01AA14 MEXICO
015 D02AA14 06695
015 E04AA14 X
015 A00AA15 ABN/AMRO BANK
015 B00AA15 S
015 C01AA15 BREDA
015 D01AA15 NETHERLANDS
015 E04AA15 X
015 A00AA16 DEN NORSKE BANK
015 B00AA16 S
015 C01AA16 OSLO
015 D01AA16 NORWAY
015 D02AA16 N-0107
015 E04AA16 X
015 A00AA17 CITIBANK N.A., MANILA
<PAGE> PAGE 4
015 B00AA17 S
015 C01AA17 MAKATI METRO
015 D01AA17 PHILIPPINES
015 E04AA17 X
015 A00AA18 BANCO ESPIRITO SANTO COMMERICIAL DE LISBOA
015 B00AA18 S
015 C01AA18 1200 LISBON
015 D01AA18 PORTUGAL
015 D02AA18 1200
015 E04AA18 X
015 A00AA19 STANDARD CHARTERED BANK
015 B00AA19 S
015 C01AA19 0104 SINGAPORE
015 D01AA19 SINGAPORE
015 D02AA19 0104
015 E04AA19 X
015 A00AA20 BANCO SANTANDER
015 B00AA20 S
015 C01AA20 MADRID 28022
015 D01AA20 SPAIN
015 D02AA20 28022
015 E04AA20 X
015 A00AA21 SKANDINAVISKA ENSKILDA BANKEN
015 B00AA21 S
015 C01AA21 STOCKHOLM, S-10640
015 D01AA21 SWEDEN
015 D02AA21 S-10640
015 E04AA21 X
015 A00AA22 SWISS BANK CORP.
015 B00AA22 S
015 C01AA22 ZURICH
015 D01AA22 SWITZERLAND
015 E04AA22 X
015 A00AA23 CENTRAL TRUST OF CHINA
015 B00AA23 S
015 C01AA23 TAIPEI
015 D01AA23 TAIWAN, R.O.C.
015 E04AA23 X
015 A00AA24 HONG KONG & SHANGHAI BANKING CORP.
015 B00AA24 S
015 C01AA24 BANGKOK 10500
015 D01AA24 THAILAND
015 D02AA24 10500
015 E04AA24 X
015 A00AA25 ROYAL BANK OF SCOTLAND
015 B00AA25 S
015 C01AA25 LONDON
015 D01AA25 UNITED KINGDOM
015 E04AA25 X
015 A00AA26 CITIBANK N.A., CARACAS
015 B00AA26 S
<PAGE> PAGE 5
015 C01AA26 CARACAS
015 D01AA26 VENEZUELA
015 E04AA26 X
015 A00AA27 THE FIRST NAT'L BANK OF BOSTON, MONTEVIDEO
015 B00AA27 S
015 C01AA27 MONTEVIDEO
015 D01AA27 URUGUAY
015 E04AA27 X
015 A00AA28 CITIBANK N.A. ISTANBUL
015 B00AA28 S
015 C01AA28 ISTANBUL
015 D01AA28 TURKEY
015 E04AA28 X
015 A00AA29 CITIBANK N.A., BUENOS AIRES
015 B00AA29 S
015 C01AA29 BUENOS AIRES
015 D01AA29 ARGENTINA
015 E04AA29 X
015 A00AA30 THE FIRST NAT'L BANK OF BOSTON, SAN PAULO
015 B00AA30 S
015 C01AA30 SAO PAOLO
015 D01AA30 BRAZIL
015 E04AA30 X
015 A00AA31 CANANDIAN IMPERIAL BANK OF COMMERCE
015 B00AA31 S
015 C01AA31 QUEBEC
015 D01AA31 CANADA
015 E04AA31 X
015 A00AA32 CITIBANK N.A., SANTIAGO
015 B00AA32 S
015 C01AA32 SANTIAGO
015 D01AA32 CHILE
015 E04AA32 X
015 A00AA33 STANDARD CHARTERED BANK, SHANGHAI
015 B00AA33 S
015 C01AA33 SHANGHAI
015 D01AA33 CHINA
015 E04AA33 X
015 A00AA34 STANDARD CHARTERED BANK, SHENZHEN
015 B00AA34 S
015 C01AA34 SHENZEN
015 D01AA34 CHINA
015 E04AA34 X
015 A00AA35 CITITRUST COLOMBIA, S.A., SOCIEDAD
015 B00AA35 S
015 C01AA35 BOGOTA
015 D01AA35 COLOMBIA
015 E04AA35 X
015 A00AA36 CESKOLOVENSKA OBCHODNI BANKA A.S. PRAGUE
015 B00AA36 S
015 C01AA36 PRAGUE
<PAGE> PAGE 6
015 D01AA36 CZECH REPUBLIC
015 E04AA36 X
015 A00AA37 CITIBANK N.A. ATHENS
015 B00AA37 S
015 C01AA37 ATHENS
015 D01AA37 GREECE
015 E04AA37 X
015 A00AA38 CITIBANK BUDAPEST RT FOR CITIBANK N.A.
015 B00AA38 S
015 C01AA38 BUDAPEST
015 D01AA38 HUNGARY
015 E04AA38 X
015 A00AA39 CITIBANK N.A., JAKARTA
015 B00AA39 S
015 C01AA39 JAKARTA
015 D01AA39 INDONESIA
015 E04AA39 X
015 A00AA40 CITIBANK N.A. MUMBAI
015 B00AA40 S
015 C01AA40 BOMBAY
015 D01AA40 INDIA
015 E04AA40 X
015 A00AA41 ALLIED IRISH BANKS PLC
015 B00AA41 S
015 C01AA41 DUBLIN
015 D01AA41 IRELAND
015 E04AA41 X
015 A00AA42 BANK HAPOALIM B.M.
015 B00AA42 S
015 C01AA42 HAPOALIM
015 D01AA42 ISREAL
015 E04AA42 X
015 A00AA43 BANQUE MAROCAINE DU COMMERCE EXERIOR
015 B00AA43 S
015 C01AA43 MOROCCO
015 D01AA43 MOROCCO
015 E04AA43 X
015 A00AA44 NATL AUSTRALIA BANK LTD AUCKLAND
015 B00AA44 S
015 C01AA44 AUCKLAND
015 D01AA44 NEW ZEALAND
015 E04AA44 X
015 A00AA45 STANDARD CHARTERED BANK KARACHI
015 B00AA45 S
015 C01AA45 KARACHI
015 D01AA45 PAKISTAN
015 E04AA45 X
015 A00AA46 CITIBANK N.A., LIMA
015 B00AA46 S
015 C01AA46 LIMA
015 D01AA46 PERU
<PAGE> PAGE 7
015 E04AA46 X
015 A00AA47 CITIBANK (POLAND) S.A. FOR CITIBANK, N.A.
015 B00AA47 S
015 C01AA47 WARSAW
015 D01AA47 POLAND
015 E04AA47 X
015 A00AA48 FIRST NATL BANK OF SOUTHERN AFRICA
015 B00AA48 S
015 C01AA48 JOHANNESBURG
015 D01AA48 SOUTH AFRICA
015 E04AA48 X
015 A00AA49 HONGKONG & SHANGHAI BANKING CORP, COLUMBO
015 B00AA49 S
015 C01AA49 COLUMBO
015 D01AA49 SRI LANKA
015 E04AA49 X
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 30
019 C00AA00 PIONEERFDS
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
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022 B000001 13-4973745
022 C000001 1839745
022 D000001 0
022 A000002 LUMMIS & CO.
022 B000002 06-0909285
022 C000002 222414
022 D000002 0
022 A000003 WILLIARS CAPITAL
022 C000003 209611
022 D000003 0
022 A000004 EUROBROKERS
022 C000004 188348
022 D000004 0
022 A000005 HOUSEHOLD FINANCE
022 B000005 36-1239445
022 C000005 104833
022 D000005 0
022 A000006 COMMERCIAL CREDIT CORP.
022 B000006 52-0883351
<PAGE> PAGE 8
022 C000006 101929
022 D000006 0
022 A000007 LANSTON AUBREY G.
022 C000007 69000
022 D000007 0
022 A000008 PRUDENTIAL FUNDING
022 B000008 22-2231168
022 C000008 65061
022 D000008 0
022 A000009 FORD MOTOR CREDIT
022 B000009 38-1612444
022 C000009 61508
022 D000009 0
022 A000010 EXXON CREDIT CORP.
022 B000010 13-3072652
022 C000010 53355
022 D000010 0
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025 D00AA07 0
025 D00AA08 0
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026 B000000 N
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026 G020000 N
026 H000000 N
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030 B00AA00 0.00
030 C00AA00 0.00
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032 00AA00 0
033 00AA00 0
034 00AA00 Y
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036 A00AA00 Y
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045 00AA00 Y
<PAGE> PAGE 9
046 00AA00 N
047 00AA00 Y
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048 J02AA00 0.000
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050 00AA00 N
051 00AA00 N
052 00AA00 N
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053 C00AA00 N
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
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054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
058 A00AA00 N
059 00AA00 Y
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<PAGE> PAGE 10
061 00AA00 1000
066 A00AA00 N
067 00AA00 N
068 A00AA00 N
068 B00AA00 N
069 00AA00 N
077 A000000 Y
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078 000000 N
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080 C00AA00 25000
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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SIGNATURE ROBERT P. NAULT
TITLE ASST. SECRETARY
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000812195
<NAME> PIONEER CASH RESERVES FUND
<SERIES>
<NUMBER> 001
<NAME> PIONEER CASH RESERVES FUND CLASS A
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<NAME> PIONEER CASH RESERVES FUND
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<NAME> PIONEER CASH RESERVES FUND CLASS B
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<NAME> PIONEER CASH RESERVES FUND
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<NUMBER> 003
<NAME> PIONEER CASH RESERVES FUND CLASS C
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<DISTRIBUTIONS-OF-GAINS> 0
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<PER-SHARE-NII> 0.03
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To the Board of Directors of
Pioneer Cash Reserves Fund:
In planning and performing our audit of the financial statements of Pioneer Cash
Reserves Fund for the year ended December 31, 1996, we considered its internal
control structure, including procedures for safeguarding securities, in order to
determine our auditing procedures for the purpose of expressing our opinion on
the financial statements and to comply with the requirements of Form N-SAR, not
to provide assurance on the internal control structure.
The management of Pioneer Cash Reserves Fund is responsible for establishing and
maintaining an internal control structure. In fulfilling this responsibility,
estimates and judgments by management are required to assess the expected
benefits and related costs of internal control structure policies and
procedures. Two of the objectives of an internal control structure are to
provide management with reasonable, but not absolute, assurance that assets are
safeguarded against loss from unauthorized use or disposition and transactions
are executed in accordance with management's authorization and recorded properly
to permit preparation of financial statements in conformity with generally
accepted accounting principles.
Because of inherent limitations in any internal control structure, errors or
irregularities may occur and may not be detected. Also, projection of any
evaluation of the structure to future periods is subject to the risk that it may
become inadequate because of changes in conditions or that the effectiveness of
the design and operation may deteriorate.
Our consideration of the internal control structure would not necessarily
disclose all matters in the internal control structure that might be material
weaknesses under standards established by the American Institute of Certified
Public Accountants. A material weakness is a condition in which the design or
operation of the specific internal control structure elements does not reduce to
a relatively low level the risk that errors or irregularities in amounts that
would be material in relation to the financial statements being audited may
occur and not be detected within a timely period by employees in the normal
course of performing their assigned functions. However, we noted no matters
involving the internal control structure, including procedures for safeguarding
securities, that we consider to be material weaknesses as defined above as of
December 31, 1996.
This report is intended solely for the information and use of management and the
Securities and Exchange Commission.
/s/ARTHUR ANDERSEN LLP
Boston, Massachusetts
February 3, 1997
