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028 D010400 51035
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<PAGE> PAGE 21
039 000400 N
040 000400 Y
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048 I020400 0.000
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050 000400 N
051 000400 N
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057 000400 N
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<PAGE> PAGE 22
060 B000400 Y
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066 G000400 N
067 000400 N
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069 000400 N
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<PAGE> PAGE 23
070 K010400 Y
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<PAGE> PAGE 24
072DD020400 0
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<PAGE> PAGE 25
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038 000500 0
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<PAGE> PAGE 26
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<PAGE> PAGE 27
070 A010500 Y
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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025 A000801 DELETE
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
025 A001101 DELETE
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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070 I011200 Y
070 I021200 N
070 J011200 Y
070 J021200 Y
070 K011200 Y
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070 L011200 Y
070 L021200 Y
070 M011200 Y
070 M021200 Y
070 N011200 Y
070 N021200 N
070 O011200 N
070 O021200 N
070 P011200 Y
070 P021200 N
070 Q011200 N
070 Q021200 N
070 R011200 Y
070 R021200 N
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071 B001200 1242763
071 C001200 918640
071 D001200 128
072 A001200 12
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<PAGE> PAGE 42
072 H001200 0
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074 C001200 11600
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<PAGE> PAGE 43
074 S001200 0
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074 U011200 48250
074 U021200 578
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076 001200 0.00
024 001400 Y
025 A001401 LEHMAN BROTHERS HOLDINGS, INC.
025 B001401 13-2518466
025 C001401 D
025 D001401 401
025 A001402 MERRILL LYNCH & COMPANY, INC.
025 B001402 13-5674085
025 C001402 D
025 D001402 249
025 A001403 DELETE
025 D001403 0
025 A001404 DELETE
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025 D001407 0
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<PAGE> PAGE 44
028 F031400 0
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042 F001400 0
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048 I021400 0.000
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048 J021400 0.000
048 K011400 0
048 K021400 0.000
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050 001400 N
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<PAGE> PAGE 45
052 001400 N
053 A001400 N
055 A001400 N
055 B001400 N
056 001400 Y
057 001400 N
058 A001400 N
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068 A001400 N
068 B001400 N
069 001400 N
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070 C011400 N
070 C021400 N
070 D011400 N
070 D021400 N
070 E011400 Y
070 E021400 N
070 F011400 N
070 F021400 N
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<PAGE> PAGE 46
070 G021400 N
070 H011400 N
070 H021400 N
070 I011400 N
070 I021400 N
070 J011400 Y
070 J021400 Y
070 K011400 Y
070 K021400 Y
070 L011400 Y
070 L021400 N
070 M011400 N
070 M021400 N
070 N011400 Y
070 N021400 N
070 O011400 N
070 O021400 N
070 P011400 Y
070 P021400 N
070 Q011400 N
070 Q021400 N
070 R011400 N
070 R021400 N
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071 B001400 15358
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<PAGE> PAGE 47
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024 001500 Y
025 A001501 MERRILL LYNCH & COMPANY, INC.
025 B001501 13-5674085
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<PAGE> PAGE 48
025 A001502 FIRST UNION LEHMAN BROTHERS HOLDINGS, INC.
025 B001502 13-2518466
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025 A001503 DELETE
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<PAGE> PAGE 49
042 F001500 0
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051 001500 N
052 001500 N
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055 A001500 N
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057 001500 N
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<PAGE> PAGE 50
062 G001500 0.0
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062 Q001500 22.7
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064 B001500 N
066 A001500 N
067 001500 N
068 A001500 N
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070 A011500 Y
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070 H011500 N
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070 I021500 N
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<PAGE> PAGE 51
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<PAGE> PAGE 52
074 E001500 0
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024 001700 N
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<PAGE> PAGE 53
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<PAGE> PAGE 54
051 001700 N
052 001700 N
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<PAGE> PAGE 55
070 F011700 Y
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<PAGE> PAGE 56
072 V001700 0
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<PAGE> PAGE 57
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<PAGE> PAGE 58
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<PAGE> PAGE 59
063 B001800 6.6
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<PAGE> PAGE 60
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<PAGE> PAGE 61
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<PAGE> PAGE 62
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<PAGE> PAGE 63
055 B001900 N
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066 F001900 N
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068 B001900 N
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070 C011900 N
070 C021900 N
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070 E011900 N
070 E021900 N
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<PAGE> PAGE 64
070 H011900 N
070 H021900 N
070 I011900 N
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070 M011900 Y
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<PAGE> PAGE 65
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SIGNATURE MARYANNE ROEPKE
TITLE TREASURER
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THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
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IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
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<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
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THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
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THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
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<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
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IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
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<NUMBER> 21
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<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
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<CIK> 0000100334
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<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
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<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
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<APPREC-INCREASE-CURRENT> 8,568,738
<NET-CHANGE-FROM-OPS> 9,773,218
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 2,558,619
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 224,914
<NUMBER-OF-SHARES-REDEEMED> 205,318
<SHARES-REINVESTED> 80,171
<NET-CHANGE-IN-ASSETS> 10,654,663
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2,459,251
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 324,788
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 325,974
<AVERAGE-NET-ASSETS> 32,291,619
<PER-SHARE-NAV-BEGIN> 31.06
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 11.17
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 3.12
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 38.97
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 32
<NAME> ULTRA FUND - INSTITUTIONAL CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 21,458,052
<INVESTMENTS-AT-VALUE> 36,206,484
<RECEIVABLES> 111,049
<ASSETS-OTHER> 1,888
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 36,319,421
<PAYABLE-FOR-SECURITIES> 50,286
<SENIOR-LONG-TERM-DEBT> 83,223
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 133,509
<SENIOR-EQUITY> 48
<PAID-IN-CAPITAL-COMMON> 20,241,629
<SHARES-COMMON-STOCK> 4,753
<SHARES-COMMON-PRIOR> 1,159
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,196,168
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14,748,067
<NET-ASSETS> 36,185,912
<DIVIDEND-INCOME> 189,604
<INTEREST-INCOME> 10,796
<OTHER-INCOME> 0
<EXPENSES-NET> 325,974
<NET-INVESTMENT-INCOME> (125,574)
<REALIZED-GAINS-CURRENT> 1,330,054
<APPREC-INCREASE-CURRENT> 8,568,738
<NET-CHANGE-FROM-OPS> 9,773,218
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 1,995
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,148
<NUMBER-OF-SHARES-REDEEMED> 1,616
<SHARES-REINVESTED> 63
<NET-CHANGE-IN-ASSETS> 10,654,663
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2,459,251
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 324,788
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 325,974
<AVERAGE-NET-ASSETS> 52,941,910
<PER-SHARE-NAV-BEGIN> 31.12
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 11.22
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 3.12
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 39.13
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 33
<NAME> ULTRA FUND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 21,458,052
<INVESTMENTS-AT-VALUE> 36,206,484
<RECEIVABLES> 111,049
<ASSETS-OTHER> 1,888
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 36,319,421
<PAYABLE-FOR-SECURITIES> 50,286
<SENIOR-LONG-TERM-DEBT> 83,223
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 133,509
<SENIOR-EQUITY> 64
<PAID-IN-CAPITAL-COMMON> 20,241,613
<SHARES-COMMON-STOCK> 6,387
<SHARES-COMMON-PRIOR> 3,193
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,196,168
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14,748,067
<NET-ASSETS> 36,185,912
<DIVIDEND-INCOME> 189,604
<INTEREST-INCOME> 10,796
<OTHER-INCOME> 0
<EXPENSES-NET> 325,974
<NET-INVESTMENT-INCOME> (125,574)
<REALIZED-GAINS-CURRENT> 1,330,054
<APPREC-INCREASE-CURRENT> 8,568,738
<NET-CHANGE-FROM-OPS> 9,773,218
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 10,096
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,738
<NUMBER-OF-SHARES-REDEEMED> 3,862
<SHARES-REINVESTED> 318
<NET-CHANGE-IN-ASSETS> 10,654,663
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2,459,251
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 324,788
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 325,974
<AVERAGE-NET-ASSETS> 180,088,573
<PER-SHARE-NAV-BEGIN> 31.00
<PER-SHARE-NII> (0.23)
<PER-SHARE-GAIN-APPREC> 11.15
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 3.12
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 38.80
<EXPENSE-RATIO> 1.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 41
<NAME> VISTA FUND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 773,258
<INVESTMENTS-AT-VALUE> 1,199,349
<RECEIVABLES> 513
<ASSETS-OTHER> 200
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,200,062
<PAYABLE-FOR-SECURITIES> 26,628
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19,480
<TOTAL-LIABILITIES> 46,108
<SENIOR-EQUITY> 744
<PAID-IN-CAPITAL-COMMON> 655,671
<SHARES-COMMON-STOCK> 74,371
<SHARES-COMMON-PRIOR> 96,529
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 71,448
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 426,091
<NET-ASSETS> 1,153,954
<DIVIDEND-INCOME> 4,065
<INTEREST-INCOME> 1,705
<OTHER-INCOME> 0
<EXPENSES-NET> 9,602
<NET-INVESTMENT-INCOME> (3,832)
<REALIZED-GAINS-CURRENT> 107,173
<APPREC-INCREASE-CURRENT> 394,280
<NET-CHANGE-FROM-OPS> 497,621
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 98,425
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 57,121
<NUMBER-OF-SHARES-REDEEMED> 79,279
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 254,661
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (31,893)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,565
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,602
<AVERAGE-NET-ASSETS> 952,023,648
<PER-SHARE-NAV-BEGIN> 9.27
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 6.19
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.41
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 42
<NAME> VISTA FUND - INSTITUTIONAL CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 773,258
<INVESTMENTS-AT-VALUE> 1,199,349
<RECEIVABLES> 513
<ASSETS-OTHER> 200
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,200,062
<PAYABLE-FOR-SECURITIES> 26,628
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19,480
<TOTAL-LIABILITIES> 46,108
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 656,415
<SHARES-COMMON-STOCK> 8
<SHARES-COMMON-PRIOR> 6
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 71,448
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 426,091
<NET-ASSETS> 1,153,954
<DIVIDEND-INCOME> 4,065
<INTEREST-INCOME> 1,705
<OTHER-INCOME> 0
<EXPENSES-NET> 9,602
<NET-INVESTMENT-INCOME> (3,832)
<REALIZED-GAINS-CURRENT> 107,173
<APPREC-INCREASE-CURRENT> 394,280
<NET-CHANGE-FROM-OPS> 497,621
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 750
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 295
<NUMBER-OF-SHARES-REDEEMED> 294
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 254,661
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (31,893)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,565
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,602
<AVERAGE-NET-ASSETS> 131,029
<PER-SHARE-NAV-BEGIN> 9.32
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 6.23
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.51
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 43
<NAME> VISTA FUND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 773,258
<INVESTMENTS-AT-VALUE> 1,199,349
<RECEIVABLES> 513
<ASSETS-OTHER> 200
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,200,062
<PAYABLE-FOR-SECURITIES> 26,628
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19,480
<TOTAL-LIABILITIES> 46,108
<SENIOR-EQUITY> 5
<PAID-IN-CAPITAL-COMMON> 656,410
<SHARES-COMMON-STOCK> 507
<SHARES-COMMON-PRIOR> 439
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 71,448
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 426,091
<NET-ASSETS> 1,153,954
<DIVIDEND-INCOME> 4,065
<INTEREST-INCOME> 1,705
<OTHER-INCOME> 0
<EXPENSES-NET> 9,602
<NET-INVESTMENT-INCOME> (3,832)
<REALIZED-GAINS-CURRENT> 107,173
<APPREC-INCREASE-CURRENT> 394,280
<NET-CHANGE-FROM-OPS> 497,621
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 378
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 346
<NUMBER-OF-SHARES-REDEEMED> 278
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 254,661
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (31,893)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,565
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,602
<AVERAGE-NET-ASSETS> 5,507,313
<PER-SHARE-NAV-BEGIN> 9.23
<PER-SHARE-NII> (0.08)
<PER-SHARE-GAIN-APPREC> 6.16
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.31
<EXPENSE-RATIO> 1.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 51
<NAME> GIFTRUST FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 801,709
<INVESTMENTS-AT-VALUE> 1,255,502
<RECEIVABLES> 22,783
<ASSETS-OTHER> 7,958
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,286,243
<PAYABLE-FOR-SECURITIES> 34,984
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 990
<TOTAL-LIABILITIES> 35,974
<SENIOR-EQUITY> 466
<PAID-IN-CAPITAL-COMMON> 920,130
<SHARES-COMMON-STOCK> 46,648
<SHARES-COMMON-PRIOR> 44,961
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (124,119)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 453,793
<NET-ASSETS> 1,250,269
<DIVIDEND-INCOME> 1,429
<INTEREST-INCOME> 1,822
<OTHER-INCOME> 0
<EXPENSES-NET> 9,568
<NET-INVESTMENT-INCOME> (6,317)
<REALIZED-GAINS-CURRENT> 24,582
<APPREC-INCREASE-CURRENT> 440,765
<NET-CHANGE-FROM-OPS> 459,030
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,452
<NUMBER-OF-SHARES-REDEEMED> 765
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 492,865
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (148,701)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,560
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,568
<AVERAGE-NET-ASSETS> 955,681
<PER-SHARE-NAV-BEGIN> 16.85
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 10.09
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 26.80
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 81
<NAME> BOND FUND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 122,367
<INVESTMENTS-AT-VALUE> 118,745
<RECEIVABLES> 8,115
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 126,860
<PAYABLE-FOR-SECURITIES> 3,744
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 299
<TOTAL-LIABILITIES> 4,043
<SENIOR-EQUITY> 133
<PAID-IN-CAPITAL-COMMON> 127,548
<SHARES-COMMON-STOCK> 13,302
<SHARES-COMMON-PRIOR> 14,893
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,242)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,622)
<NET-ASSETS> 122,817
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9,109
<OTHER-INCOME> 0
<EXPENSES-NET> 1,107
<NET-INVESTMENT-INCOME> 8,002
<REALIZED-GAINS-CURRENT> (1,195)
<APPREC-INCREASE-CURRENT> (8,377)
<NET-CHANGE-FROM-OPS> (1,570)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 7,892
<DISTRIBUTIONS-OF-GAINS> 68
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,841
<NUMBER-OF-SHARES-REDEEMED> 7,217
<SHARES-REINVESTED> 785
<NET-CHANGE-IN-ASSETS> (24,832)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 22
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,095
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,107
<AVERAGE-NET-ASSETS> 135,531
<PER-SHARE-NAV-BEGIN> 9.77
<PER-SHARE-NII> 0.55
<PER-SHARE-GAIN-APPREC> (0.65)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.55
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.12
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 83
<NAME> BOND FUND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 122,367
<INVESTMENTS-AT-VALUE> 118,745
<RECEIVABLES> 8,115
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 126,860
<PAYABLE-FOR-SECURITIES> 3,744
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 299
<TOTAL-LIABILITIES> 4,043
<SENIOR-EQUITY> 2
<PAID-IN-CAPITAL-COMMON> 127,679
<SHARES-COMMON-STOCK> 160
<SHARES-COMMON-PRIOR> 220
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,242)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,622)
<NET-ASSETS> 122,817
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9,109
<OTHER-INCOME> 0
<EXPENSES-NET> 1,107
<NET-INVESTMENT-INCOME> 8,002
<REALIZED-GAINS-CURRENT> (1,195)
<APPREC-INCREASE-CURRENT> (8,377)
<NET-CHANGE-FROM-OPS> (1,570)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 110
<DISTRIBUTIONS-OF-GAINS> 1
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 166
<NUMBER-OF-SHARES-REDEEMED> 237
<SHARES-REINVESTED> 11
<NET-CHANGE-IN-ASSETS> (24,832)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 22
<OVERDISTRIB-NII-PRIOR> 0
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<GROSS-EXPENSE> 1,107
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<PER-SHARE-GAIN-APPREC> (0.65)
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<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.12
<EXPENSE-RATIO> 1.05
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 111
<NAME> HERITAGE FUND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 790,262
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<TOTAL-LIABILITIES> 37,086
<SENIOR-EQUITY> 768
<PAID-IN-CAPITAL-COMMON> 662,071
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<ACCUMULATED-NII-CURRENT> 3,419
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 114,478
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 220,379
<NET-ASSETS> 1,001,115
<DIVIDEND-INCOME> 7,854
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<OTHER-INCOME> 0
<EXPENSES-NET> 9,845
<NET-INVESTMENT-INCOME> 1,832
<REALIZED-GAINS-CURRENT> 126,044
<APPREC-INCREASE-CURRENT> 138,185
<NET-CHANGE-FROM-OPS> 266,061
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<DISTRIBUTIONS-OF-INCOME> 1,950
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 26,961
<NUMBER-OF-SHARES-REDEEMED> 48,363
<SHARES-REINVESTED> 179
<NET-CHANGE-IN-ASSETS> 21,855
<ACCUMULATED-NII-PRIOR> 1,960
<ACCUMULATED-GAINS-PRIOR> (9,664)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
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<AVERAGE-NET-ASSETS> 981,795
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<PER-SHARE-GAIN-APPREC> 3.04
<PER-SHARE-DIVIDEND> 0.02
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<PER-SHARE-NAV-END> 13.02
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 112
<NAME> HERITAGE FUND - INSTITUTIONAL CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 790,262
<INVESTMENTS-AT-VALUE> 1,011,388
<RECEIVABLES> 24,489
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<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,038,201
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 818
<TOTAL-LIABILITIES> 37,086
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 662,839
<SHARES-COMMON-STOCK> 7
<SHARES-COMMON-PRIOR> 7
<ACCUMULATED-NII-CURRENT> 3,419
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 114,478
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 220,379
<NET-ASSETS> 1,001,115
<DIVIDEND-INCOME> 7,854
<INTEREST-INCOME> 3,823
<OTHER-INCOME> 0
<EXPENSES-NET> 9,845
<NET-INVESTMENT-INCOME> 1,832
<REALIZED-GAINS-CURRENT> 126,044
<APPREC-INCREASE-CURRENT> 138,185
<NET-CHANGE-FROM-OPS> 266,061
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5
<NUMBER-OF-SHARES-REDEEMED> 5
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 21,855
<ACCUMULATED-NII-PRIOR> 1,960
<ACCUMULATED-GAINS-PRIOR> (9,664)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,827
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,845
<AVERAGE-NET-ASSETS> 82,496
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 3.04
<PER-SHARE-DIVIDEND> 0.04
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.04
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 113
<NAME> HERITAGE FUND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 790,262
<INVESTMENTS-AT-VALUE> 1,011,388
<RECEIVABLES> 24,489
<ASSETS-OTHER> 2,324
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,038,201
<PAYABLE-FOR-SECURITIES> 36,268
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 818
<TOTAL-LIABILITIES> 37,086
<SENIOR-EQUITY> 1
<PAID-IN-CAPITAL-COMMON> 662,838
<SHARES-COMMON-STOCK> 82
<SHARES-COMMON-PRIOR> 75
<ACCUMULATED-NII-CURRENT> 3,419
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 114,478
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 220,379
<NET-ASSETS> 1,001,115
<DIVIDEND-INCOME> 7,854
<INTEREST-INCOME> 3,823
<OTHER-INCOME> 0
<EXPENSES-NET> 9,845
<NET-INVESTMENT-INCOME> 1,832
<REALIZED-GAINS-CURRENT> 126,044
<APPREC-INCREASE-CURRENT> 138,185
<NET-CHANGE-FROM-OPS> 266,061
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 225
<NUMBER-OF-SHARES-REDEEMED> 218
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 21,855
<ACCUMULATED-NII-PRIOR> 1,960
<ACCUMULATED-GAINS-PRIOR> (9,664)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,827
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,845
<AVERAGE-NET-ASSETS> 110,238
<PER-SHARE-NAV-BEGIN> 9.96
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 3.03
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.98
<EXPENSE-RATIO> 1.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 121
<NAME> BALANCED FUND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 825,581
<INVESTMENTS-AT-VALUE> 920,135
<RECEIVABLES> 22,543
<ASSETS-OTHER> 128
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 942,806
<PAYABLE-FOR-SECURITIES> 16,215
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,271
<TOTAL-LIABILITIES> 17,486
<SENIOR-EQUITY> 482
<PAID-IN-CAPITAL-COMMON> 706,729
<SHARES-COMMON-STOCK> 48,250
<SHARES-COMMON-PRIOR> 48,385
<ACCUMULATED-NII-CURRENT> 2,226
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 120,193
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 95,690
<NET-ASSETS> 925,320
<DIVIDEND-INCOME> 7,725
<INTEREST-INCOME> 25,032
<OTHER-INCOME> 0
<EXPENSES-NET> 9,574
<NET-INVESTMENT-INCOME> 23,183
<REALIZED-GAINS-CURRENT> 126,427
<APPREC-INCREASE-CURRENT> (40,562)
<NET-CHANGE-FROM-OPS> 109,048
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 23,448
<DISTRIBUTIONS-OF-GAINS> 102,260
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9,402
<NUMBER-OF-SHARES-REDEEMED> 16,358
<SHARES-REINVESTED> 6,821
<NET-CHANGE-IN-ASSETS> (19,544)
<ACCUMULATED-NII-PRIOR> 2,690
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 96,773
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,520
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,574
<AVERAGE-NET-ASSETS> 945,115
<PER-SHARE-NAV-BEGIN> 19.39
<PER-SHARE-NII> 0.46
<PER-SHARE-GAIN-APPREC> 1.69
<PER-SHARE-DIVIDEND> 0.47
<PER-SHARE-DISTRIBUTIONS> 2.12
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 18.95
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 123
<NAME> BALANCED FUND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 825,581
<INVESTMENTS-AT-VALUE> 920,135
<RECEIVABLES> 22,543
<ASSETS-OTHER> 128
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 942,806
<PAYABLE-FOR-SECURITIES> 16,215
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,271
<TOTAL-LIABILITIES> 17,486
<SENIOR-EQUITY> 6
<PAID-IN-CAPITAL-COMMON> 707,205
<SHARES-COMMON-STOCK> 578
<SHARES-COMMON-PRIOR> 347
<ACCUMULATED-NII-CURRENT> 2,226
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 120,193
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 95,690
<NET-ASSETS> 925,320
<DIVIDEND-INCOME> 7,725
<INTEREST-INCOME> 25,032
<OTHER-INCOME> 0
<EXPENSES-NET> 9,574
<NET-INVESTMENT-INCOME> 23,183
<REALIZED-GAINS-CURRENT> 126,427
<APPREC-INCREASE-CURRENT> (40,562)
<NET-CHANGE-FROM-OPS> 109,048
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 199
<DISTRIBUTIONS-OF-GAINS> 747
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 575
<NUMBER-OF-SHARES-REDEEMED> 396
<SHARES-REINVESTED> 52
<NET-CHANGE-IN-ASSETS> (19,544)
<ACCUMULATED-NII-PRIOR> 2,690
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 96,773
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,520
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,574
<AVERAGE-NET-ASSETS> 9,011
<PER-SHARE-NAV-BEGIN> 19.38
<PER-SHARE-NII> 0.41
<PER-SHARE-GAIN-APPREC> 1.69
<PER-SHARE-DIVIDEND> 0.42
<PER-SHARE-DISTRIBUTIONS> 2.12
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 18.94
<EXPENSE-RATIO> 1.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 141
<NAME> LIMITED-TERM BOND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 18,739
<INVESTMENTS-AT-VALUE> 18,526
<RECEIVABLES> 268
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 18,794
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 481
<TOTAL-LIABILITIES> 481
<SENIOR-EQUITY> 15
<PAID-IN-CAPITAL-COMMON> 18,598
<SHARES-COMMON-STOCK> 1,515
<SHARES-COMMON-PRIOR> 1,875
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (87)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (213)
<NET-ASSETS> 18,313
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,210
<OTHER-INCOME> 0
<EXPENSES-NET> 143
<NET-INVESTMENT-INCOME> 1,067
<REALIZED-GAINS-CURRENT> (87)
<APPREC-INCREASE-CURRENT> (456)
<NET-CHANGE-FROM-OPS> 524
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,004
<DISTRIBUTIONS-OF-GAINS> 87
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 428
<NUMBER-OF-SHARES-REDEEMED> 890
<SHARES-REINVESTED> 102
<NET-CHANGE-IN-ASSETS> (1,371)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 92
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 137
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 143
<AVERAGE-NET-ASSETS> 18,671
<PER-SHARE-NAV-BEGIN> 10.05
<PER-SHARE-NII> 0.53
<PER-SHARE-GAIN-APPREC> (0.26)
<PER-SHARE-DIVIDEND> 0.53
<PER-SHARE-DISTRIBUTIONS> 0.05
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.74
<EXPENSE-RATIO> 0.70
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 143
<NAME> LIMITED-TERM BOND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 18,739
<INVESTMENTS-AT-VALUE> 18,526
<RECEIVABLES> 268
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 18,794
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 481
<TOTAL-LIABILITIES> 481
<SENIOR-EQUITY> 4
<PAID-IN-CAPITAL-COMMON> 18,609
<SHARES-COMMON-STOCK> 366
<SHARES-COMMON-PRIOR> 84
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (87)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (213)
<NET-ASSETS> 18,313
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,210
<OTHER-INCOME> 0
<EXPENSES-NET> 143
<NET-INVESTMENT-INCOME> 1,067
<REALIZED-GAINS-CURRENT> (87)
<APPREC-INCREASE-CURRENT> (456)
<NET-CHANGE-FROM-OPS> 524
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 63
<DISTRIBUTIONS-OF-GAINS> 5
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 404
<NUMBER-OF-SHARES-REDEEMED> 128
<SHARES-REINVESTED> 8
<NET-CHANGE-IN-ASSETS> (1,371)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 92
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 137
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 143
<AVERAGE-NET-ASSETS> 1,228
<PER-SHARE-NAV-BEGIN> 10.05
<PER-SHARE-NII> 0.50
<PER-SHARE-GAIN-APPREC> (0.26)
<PER-SHARE-DIVIDEND> 0.50
<PER-SHARE-DISTRIBUTIONS> 0.05
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.74
<EXPENSE-RATIO> 0.95
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 151
<NAME> INTERMEDIATE-TERM BOND - INVESTOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 34,948
<INVESTMENTS-AT-VALUE> 34,088
<RECEIVABLES> 787
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 34,879
<PAYABLE-FOR-SECURITIES> 650
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39
<TOTAL-LIABILITIES> 689
<SENIOR-EQUITY> 31
<PAID-IN-CAPITAL-COMMON> 35,297
<SHARES-COMMON-STOCK> 3,124
<SHARES-COMMON-PRIOR> 2,618
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (278)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (860)
<NET-ASSETS> 34,190
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,100
<OTHER-INCOME> 0
<EXPENSES-NET> 260
<NET-INVESTMENT-INCOME> 1,840
<REALIZED-GAINS-CURRENT> (271)
<APPREC-INCREASE-CURRENT> (1,458)
<NET-CHANGE-FROM-OPS> 111
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,605
<DISTRIBUTIONS-OF-GAINS> 178
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,477
<NUMBER-OF-SHARES-REDEEMED> 1,132
<SHARES-REINVESTED> 161
<NET-CHANGE-IN-ASSETS> 4,243
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 193
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 237
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 260
<AVERAGE-NET-ASSETS> 28,689
<PER-SHARE-NAV-BEGIN> 10.24
<PER-SHARE-NII> 0.55
<PER-SHARE-GAIN-APPREC> (0.52)
<PER-SHARE-DIVIDEND> 0.55
<PER-SHARE-DISTRIBUTIONS> 0.07
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.65
<EXPENSE-RATIO> 0.75
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 153
<NAME> INTERMEDIATE-TERM BOND - ADVISOR CLASS
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 34,948
<INVESTMENTS-AT-VALUE> 34,088
<RECEIVABLES> 787
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 34,879
<PAYABLE-FOR-SECURITIES> 650
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39
<TOTAL-LIABILITIES> 689
<SENIOR-EQUITY> 4
<PAID-IN-CAPITAL-COMMON> 35,324
<SHARES-COMMON-STOCK> 419
<SHARES-COMMON-PRIOR> 308
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (278)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (860)
<NET-ASSETS> 34,190
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,100
<OTHER-INCOME> 0
<EXPENSES-NET> 260
<NET-INVESTMENT-INCOME> 1,840
<REALIZED-GAINS-CURRENT> (271)
<APPREC-INCREASE-CURRENT> (1,458)
<NET-CHANGE-FROM-OPS> 111
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 235
<DISTRIBUTIONS-OF-GAINS> 22
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 699
<NUMBER-OF-SHARES-REDEEMED> 610
<SHARES-REINVESTED> 22
<NET-CHANGE-IN-ASSETS> 4,243
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 193
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 237
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 260
<AVERAGE-NET-ASSETS> 4,380
<PER-SHARE-NAV-BEGIN> 10.24
<PER-SHARE-NII> 0.53
<PER-SHARE-GAIN-APPREC> (0.52)
<PER-SHARE-DIVIDEND> 0.53
<PER-SHARE-DISTRIBUTIONS> 0.07
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.65
<EXPENSE-RATIO> 1.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC. AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 17
<NAME> NEW OPPORTUNITIES FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 265,639
<INVESTMENTS-AT-VALUE> 395,205
<RECEIVABLES> 13,323
<ASSETS-OTHER> 3,476
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 412,004
<PAYABLE-FOR-SECURITIES> 10,566
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 476
<TOTAL-LIABILITIES> 11,042
<SENIOR-EQUITY> 438
<PAID-IN-CAPITAL-COMMON> 213,696
<SHARES-COMMON-STOCK> 43,792
<SHARES-COMMON-PRIOR> 44,797
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 57,262
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 129,566
<NET-ASSETS> 400,962
<DIVIDEND-INCOME> 157
<INTEREST-INCOME> 437
<OTHER-INCOME> 0
<EXPENSES-NET> 4,177
<NET-INVESTMENT-INCOME> (3,583)
<REALIZED-GAINS-CURRENT> 74,553
<APPREC-INCREASE-CURRENT> 115,193
<NET-CHANGE-FROM-OPS> 186,163
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7,011
<NUMBER-OF-SHARES-REDEEMED> 8,016
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 187,473
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (13,708)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4,175
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,177
<AVERAGE-NET-ASSETS> 278,276
<PER-SHARE-NAV-BEGIN> 4.77
<PER-SHARE-NII> (0.08)
<PER-SHARE-GAIN-APPREC> 4.47
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.16
<EXPENSE-RATIO> 1.50
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 18
<NAME> HIGH YIELD FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 36,851,696
<INVESTMENTS-AT-VALUE> 33,601,019
<RECEIVABLES> 663,041
<ASSETS-OTHER> 29,539
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 34,293,599
<PAYABLE-FOR-SECURITIES> 706,258
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 50,739
<TOTAL-LIABILITIES> 756,997
<SENIOR-EQUITY> 39,276
<PAID-IN-CAPITAL-COMMON> 39,133,222
<SHARES-COMMON-STOCK> 3,927,598
<SHARES-COMMON-PRIOR> 3,692,330
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,385,219)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,250,677)
<NET-ASSETS> 33,536,602
<DIVIDEND-INCOME> 26,104
<INTEREST-INCOME> 3,899,959
<OTHER-INCOME> 0
<EXPENSES-NET> 361,109
<NET-INVESTMENT-INCOME> 3,564,954
<REALIZED-GAINS-CURRENT> (2,378,561)
<APPREC-INCREASE-CURRENT> 1,540,173
<NET-CHANGE-FROM-OPS> 2,726,566
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 3,564,954
<DISTRIBUTIONS-OF-GAINS> 36,637
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,993,456
<NUMBER-OF-SHARES-REDEEMED> 6,071,866
<SHARES-REINVESTED> 313,678
<NET-CHANGE-IN-ASSETS> 1,307,669
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 29,979
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 360,784
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 361,109
<AVERAGE-NET-ASSETS> 40,076,609
<PER-SHARE-NAV-BEGIN> 8.73
<PER-SHARE-NII> 0.80
<PER-SHARE-GAIN-APPREC> (0.18)
<PER-SHARE-DIVIDEND> 0.80
<PER-SHARE-DISTRIBUTIONS> 0.01
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 8.54
<EXPENSE-RATIO> 0.90
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY MUTUAL FUNDS, INC.
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 19
<NAME> TAX MANAGED VALUE FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> OCT-31-1999
<INVESTMENTS-AT-COST> 45,575,116
<INVESTMENTS-AT-VALUE> 46,083,056
<RECEIVABLES> 45,900
<ASSETS-OTHER> 44,228
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 46,173,184
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 41,016
<TOTAL-LIABILITIES> 41,016
<SENIOR-EQUITY> 89,030
<PAID-IN-CAPITAL-COMMON> 45,422,077
<SHARES-COMMON-STOCK> 8,903,049
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 286,032
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (172,911)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 507,940
<NET-ASSETS> 46,132,168
<DIVIDEND-INCOME> 503,067
<INTEREST-INCOME> 59,575
<OTHER-INCOME> 0
<EXPENSES-NET> 276,610
<NET-INVESTMENT-INCOME> 286,032
<REALIZED-GAINS-CURRENT> (172,911)
<APPREC-INCREASE-CURRENT> 507,940
<NET-CHANGE-FROM-OPS> 621,061
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 47,330,405
<NUMBER-OF-SHARES-REDEEMED> 1,819,298
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 46,132,168
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 276,382
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 276,610
<AVERAGE-NET-ASSETS> 42,843,215
<PER-SHARE-NAV-BEGIN> 5.00
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 0.14
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 5.18
<EXPENSE-RATIO> 1.10
</TABLE>
INDEPENDENT AUDITORS' REPORT
The Board of Directors,
American Century Mutual Funds, Inc.
In planning and performing our audits of the financial statements of Growth
Fund, Select Fund, Ultra Fund, Vista Fund, Heritage Fund, Giftrust Fund,
Balanced Fund, Bond Fund, Limited-Term Bond Fund, Intermediate-Term Bond Fund,
New Opportunities Fund, High-Yield Fund, Tax-Managed Value Fund comprising
American Century Mutual Funds, Inc. (the "Company") for the year ended October
31, 1999 (on which we have issued our reports dated December 7, 1999), we
considered its internal control, including control activities 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, and not to provide assurance on the Company's
internal control.
The management of the Company is responsible for establishing and
maintaining internal control. In fulfilling this responsibility, estimates and
judgments by management are required to assess the expected benefits and related
costs of controls. Generally, controls that are relevant to an audit pertain to
the entity's objective of preparing financial statements for external purposes
that are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use, or disposition.
Because of inherent limitations in any internal control, misstatements due
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions or
that the degree of compliance with policies or procedures deteriorate.
Our consideration of the Company's internal control would not necessarily
disclose all matters in internal control 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 one or
more of the internal control components does not reduce to a relatively low
level the risk that misstatements error or fraud 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
Company's internal control and its operation, including controls for
safeguarding securities, that we consider to be material weaknesses as defined
above as of October 31, 1999.
This report is intended solely for the information and use of management,
the Board of Directors of the Company, and the Securities and Exchange
Commission and is not intended to be and should not be used by anyone other than
these specified parties.
Deloitte & Touche LLP
December 7, 1999
EXHIBIT 770
Rule 10f-3, under the Investment Company Act of 1940 provides a limited
exemption from section 10(f) of the Act, provided that all transactions effected
pursuant to the rule are reported on form N-SAR. For the period ending October
31, 1999, American Century Mutual Funds, Inc. effected eighteen (18)
transactions pursuant to the rule. The attached exhibit sets forth the following
information required by Sub-Item 770 of form N-SAR:
(i) from whom the securities were acquired - See Attachment A
(ii) the terms of the transaction - See Attachment A
(iii) the information or materials upon which the determination described
in paragraph (b)(10)(iii), formerly paragraph (h)(3), of Rule 10f-3 was made -
The funds' adviser provides quarterly reports to the funds' Board of Directors
which include: the information in Attachment A and a representation by
management that it performed procedures to determine compliance with the rule,
and that any additional supporting documentation the Board may require will be
made available upon its request.
Fund Issuer Ticker Principal AmountAmount Purchased (Trade Date Price
Underwriter Underwriting Spread Growth Goldman Sachs GS $3,657,000,000
$26,812,700.00 05/03/1999 $53.0000 GSCO 4.245% USD $2.250 Tax Managed Value
Goldman Sachs GS $3,657,000,000 $36,938,000.00 05/03/1999 $53.0000 GSCO 4.245%
USD $2.250 New Opportunities Media Metrix Inc. MMXI $58,650,000 $17,000.00
05/07/1999 $17.0000 TWPT 7.000% USD $1.190 (split order) $425,000.00 DLJ Vista
DLJ Direct DIR $368,000,000 $1,000,000.00 05/25/1999 $20.0000 DLJ 6.750% USD
$1.350 Giftrust Concord E F S Inc CEFT $1,174,129,781 $8,707,500.00 06/17/1999
$32.2500 SBSH 4.000% USD $1.290 New Opportunities Concord E F S Inc CEFT
$1,174,129,781 $2,444,550.00 06/17/1999 $32.2500 SBSH 4.000% USD $1.290 Heritage
Concord E F S Inc CEFT $1,174,129,781 $4,537,575.00 06/17/1999 $32.2500 SBSH
4.000% USD $1.290 New Opportunities Viant Corp VIAN $ 55,200,000 $800,000.00
06/17/1999 $16.0000 GSCO 7.000% USD $1.120 Heritage TD Waterhouse TWE
$1,134,000,000 $3,444,000.00 06/23/1999 $24.0000 FBCO 4.750% USD $1.140 Giftrust
Juniper Networks JNPR $187,680,000 $999,600.00 06/24/1999 $34.0000 GSCO 7.000%
USD $2.380 Vista Juniper Networks JNPR $187,680,000 $969,000.00 06/24/1999
$34.0000 GSCO 7.000% USD $2.380 Heritage Genetech Inc DNA $2,134,000,000
$1,309,500.00 07/20/1999 $97.0000 JPMS 2.500% USD $2.425 New Opportunities Wink
Communications WINK $87,400,000 $480,000.00 08/19/1999 $16.0000 DLJ 7.000% USD
$1.120 Vista Grupo Iusacell CELY $150,937,500 $2,362,500.00 08/05/1999 $10.5000
JPMS 3.700% USD $0.390 Vista Foundry Networks Inc FDRY $143,750,000 $952,500.00
09/28/1999 $25.0000 DBKS 7.000% USD $1.750 Giftrust Foundry Networks Inc FDRY
$143,750,000 $1,017,500.00 09/28/1999 $25.0000 DBKS 7.000% USD $1.750 Heritage
Foundry Networks Inc FDRY $143,750,000 $885,000.00 09/28/1999 $25.0000 DBKS
7.000% USD $1.750 New Opportunities Jupiter Communications JPTR $ 75,468,750
$840,000.00 10/08/1999 $21.0000 DLJ 7.000% USD $1.470
