<PAGE> PAGE 1
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000 C000000 0000312538
000 D000000 N
000 E000000 NF
000 F000000 Y
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000 I000000 3.0.a
000 J000000 A
001 A000000 CENTENNIAL MONEY MARKET TRUST
001 B000000 811-2945
001 C000000 3037683200
002 A000000 6803 SOUTH TUCSON WAY
002 B000000 ENGLEWOOD
002 C000000 CO
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008 A000001 CENTENNIAL ASSET MANAGEMENT CORPORATION
008 B000001 A
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008 D010001 DENVER
008 D020001 CO
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011 A000001 CENTENNIAL ASSET MANAGEMENT CORPORATION
011 B000001 8-22948
011 C010001 DENVER
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011 C030001 80231
012 A000001 SHAREHOLDER SERVICES, INC.
012 B000001 84-907
012 C010001 ENGLEWOOD
012 C020001 CO
012 C030001 80112
012 C040001 3924
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 DENVER
<PAGE> PAGE 2
013 B020001 CO
013 B030001 80202
014 A000001 A.G. EDWARDS & SONS INC.
014 B000001 8-13580
015 A000001 CITIBANK, N.A.
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10043
015 E010001 X
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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SIGNATURE BRIAN W. WIXTED
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 312538
<NAME> Centennial Money Market Trust
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUN-30-2000
<PERIOD-START> JUL-01-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 18,113,417,796
<INVESTMENTS-AT-VALUE> 18,113,417,796
<RECEIVABLES> 1,319,099,960
<ASSETS-OTHER> 726,376
<OTHER-ITEMS-ASSETS> 72,697,392
<TOTAL-ASSETS> 19,505,941,524
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,368,476,993
<TOTAL-LIABILITIES> 1,368,476,993
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 18,137,394,171
<SHARES-COMMON-STOCK> 18,137,926,886
<SHARES-COMMON-PRIOR> 17,821,095,704
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 70,360
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 18,137,464,531
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 503,400,275
<OTHER-INCOME> 0
<EXPENSES-NET> 58,848,260
<NET-INVESTMENT-INCOME> 444,552,015
<REALIZED-GAINS-CURRENT> (8,114)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 444,543,901
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 444,552,015
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 26,776,435,760
<NUMBER-OF-SHARES-REDEEMED> 26,921,258,538
<SHARES-REINVESTED> 461,653,960
<NET-CHANGE-IN-ASSETS> 316,823,068
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 78,474
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 30,647,835
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 58,881,540
<AVERAGE-NET-ASSETS> 18,151,000,000
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.03
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.64
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
The registrant is hereby reporting the default of General American Life
Insurance Co., 5.24%, 8/2/99. Credit rating agencies downgraded the credit
rating of the issuer of the relevant securities in late July, 1999. Therefore,
pursuant to the terms of the securities, the Registrant demanded that the issuer
repurchase the securities. The issuer, faced with simultaneous requests from
other registrants, was unable to satisfy the repurchase request and therefore
defaulted under the terms of the securities.
In accordance with no-action relief granted by the Commission's staff, the
Registrant's investment adviser took steps to ensure that the securities
remained "eligible securities."
