SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM N-1A
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X]
Pre-Effective Amendment No. [ ]
Post-Effective Amendment No. 81 [X]
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [X]
Amendment No. 81 [X]
(Check appropriate box or boxes.)
AMERICAN CENTURY MUTUAL FUNDS, INC.
_________________________________________________________________
(Exact Name of Registrant as Specified in Charter)
4500 Main Street, Kansas City, MO 64141-6200
_________________________________________________________________
(Address of Principal Executive Offices) (Zip Code)
Registrant's Telephone Number, including Area Code: (816) 531-5575
William M. Lyons, 4500 Main Street, Kansas City, MO 64141-6200
_________________________________________________________________
(Name and Address of Agent for Service)
Approximate Date of Proposed Public Offering: January 1, 1999
It is proposed that this filing will become effective (check appropriate box)
[ ] immediately upon filing pursuant to paragraph (b)
[X] on March 1, 1999 pursuant to paragraph (b)
[ ] 60 days after filing pursuant to paragraph (a)(1)
[ ] on (date) pursuant to paragraph (a)(1)
[ ] 75 days after filing pursuant to paragraph (a)(2)
[ ] on (date) pursuant to paragraph (a)(2) of rule 485.
If appropriate, check the following box:
[X] This post-effective amendment designates a new effective date for a
previously filed post-effective amendment.
- --------------------------------------------------------------------------------
This filing is being made to extend the date of effectiveness of the
Registrant's Post-Effective Amendment No. 79 to March 1, 1999. The
Post-Effective Amendment originally requested effectiveness as of January 29,
1999.
The following documents are hereby incorporated by reference:
* Prospectuses for each of the funds under the issuer American Century Mutual
Funds, Inc., dated January 29, 1999 filed pursuant to Rule 485(a) on
November 30, 1998 (Accession No. 0000100334-98-000025).
* Statement of Additional Information for American Century Mutual Funds, Inc.
dated January 29, 1999 filed pursuant to Rule 485(a) on November 30, 1998
(Accession No. 0000100334-98-000025).
* Part C to the Registration Statement of American Century Mutual Funds, Inc.
dated January 29, 1999 filed pursuant to Rule 485(a) on November 30, 1998
(Accession No. 0000100334-98-000025).
Registrant is extending effectiveness of its Registration Statement in order to
incorporate comments provided to its manager by the staff of the Commission.
<PAGE>
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it has duly caused
this Post-Effective Amendment No. 81 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Kansas City, State of
Missouri on the 27th day of January, 1999.
American Century Mutual Funds, Inc.
(Registrant)
By: /*/George A. Rio
George A. Rio
President and Principal Executive Officer
Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 81 has been signed below by the following persons
in the capacities and on the dates indicated.
Signature Title Date
*George A. Rio President, Principal Executive January 27, 1999
George A. Rio and Principal Financial Officer
*Maryanne Roepke Vice President and Treasurer January 27, 1999
Maryanne Roepke
*James E. Stowers, Jr. Chairman of the Board and January 27, 1999
James E. Stowers, Jr. Director
*James E. Stowers III Director January 27, 1999
James E. Stowers III
*Thomas A. Brown Director January 27, 1999
Thomas A. Brown
*Robert W. Doering, M.D. Director January 27, 1999
Robert W. Doering, M.D.
*Andrea C. Hall, Ph.D. Director January 27, 1999
Andrea C. Hall, Ph.D.
*Donald H. Pratt Director January 27, 1999
Donald H. Pratt
*Lloyd T. Silver, Jr. Director January 27, 1999
Lloyd T. Silver, Jr.
*M. Jeannine Strandjord Director January 27, 1999
M. Jeannine Strandjord
*D. D. (Del) Hock Director January 27, 1999
D. D. (Del) Hock
*By /s/Charles A. Etherington
Charles A. Etherington
Attorney-in-Fact
<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 IS ITS ENTIRETY
BY REFERENCE TO SUCH REPORT. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 1
<NAME> AMERICAN CENTURY-TWENTIETH CENTURY GROWTH FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 4,884,458
<INVESTMENTS-AT-VALUE> 6,138,571
<RECEIVABLES> 30,042
<ASSETS-OTHER> 17,785
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 6,186,398
<PAYABLE-FOR-SECURITIES> 68,002
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 15,203
<TOTAL-LIABILITIES> 83,205
<SENIOR-EQUITY> 2,177
<PAID-IN-CAPITAL-COMMON> 3,691,569
<SHARES-COMMON-STOCK> 217,745
<SHARES-COMMON-PRIOR> 212,130
<ACCUMULATED-NII-CURRENT> (2,892)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,145,850
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,266,489
<NET-ASSETS> 6,103,193
<DIVIDEND-INCOME> 43,899
<INTEREST-INCOME> 12,311
<OTHER-INCOME> 0
<EXPENSES-NET> 57,467
<NET-INVESTMENT-INCOME> (1,257)
<REALIZED-GAINS-CURRENT> 1,170,010
<APPREC-INCREASE-CURRENT> (252,884)
<NET-CHANGE-FROM-OPS> 915,869
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 764,080
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 53,292
<NUMBER-OF-SHARES-REDEEMED> 50,812
<SHARES-REINVESTED> 31,668
<NET-CHANGE-IN-ASSETS> 987,995
<ACCUMULATED-NII-PRIOR> 3,075
<ACCUMULATED-GAINS-PRIOR> 873,337
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 57,395
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 57,467
<AVERAGE-NET-ASSETS> 5,740,455
<PER-SHARE-NAV-BEGIN> 27.86 <F2>
<PER-SHARE-NII> 0.01 <F2>
<PER-SHARE-GAIN-APPREC> 4.35 <F2>
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 4.17 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 28.03 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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 IS ITS ENTIRETY
BY REFERENCE TO SUCH REPORT. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 2
<NAME> AMERICAN CENTURY-TWENTIETH CENTURY SELECT FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 4,605,949
<INVESTMENTS-AT-VALUE> 5,659,452
<RECEIVABLES> 107,056
<ASSETS-OTHER> 11,454
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5,777,962
<PAYABLE-FOR-SECURITIES> 174,837
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,020
<TOTAL-LIABILITIES> 184,857
<SENIOR-EQUITY> 1,129
<PAID-IN-CAPITAL-COMMON> 3,492,423
<SHARES-COMMON-STOCK> 112,892
<SHARES-COMMON-PRIOR> 115,272
<ACCUMULATED-NII-CURRENT> 13,643
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,018,905
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,067,005
<NET-ASSETS> 5,593,105
<DIVIDEND-INCOME> 56,441
<INTEREST-INCOME> 11,019
<OTHER-INCOME> 0
<EXPENSES-NET> 53,934
<NET-INVESTMENT-INCOME> 13,526
<REALIZED-GAINS-CURRENT> 1,121,814
<APPREC-INCREASE-CURRENT> (62,308)
<NET-CHANGE-FROM-OPS> 1,073,032
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 19,559
<DISTRIBUTIONS-OF-GAINS> 785,248
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20,071
<NUMBER-OF-SHARES-REDEEMED> 25,096
<SHARES-REINVESTED> 18,665
<NET-CHANGE-IN-ASSETS> 810,894
<ACCUMULATED-NII-PRIOR> 6,107
<ACCUMULATED-GAINS-PRIOR> 625,044
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 53,875
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 53,934
<AVERAGE-NET-ASSETS> 5,405,354
<PER-SHARE-NAV-BEGIN> 48.18 <F2>
<PER-SHARE-NII> 0.12 <F2>
<PER-SHARE-GAIN-APPREC> 9.37 <F2>
<PER-SHARE-DIVIDEND> 0.20 <F2>
<PER-SHARE-DISTRIBUTIONS> 7.93 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 49.54 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 3
<NAME> TWENTIETH CENTURY ULTRA FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 19,622,249
<INVESTMENTS-AT-VALUE> 25,803,593
<RECEIVABLES> 23,980
<ASSETS-OTHER> 38,496
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,866,069
<PAYABLE-FOR-SECURITIES> 287,552
<SENIOR-LONG-TERM-DEBT> 47,268
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 334,820
<SENIOR-EQUITY> 8,221
<PAID-IN-CAPITAL-COMMON> 16,884,448
<SHARES-COMMON-STOCK> 822,050
<SHARES-COMMON-PRIOR> 811,128
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,459,251
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6,179,329
<NET-ASSETS> 25,531,249
<DIVIDEND-INCOME> 203,387
<INTEREST-INCOME> 24,833
<OTHER-INCOME> 0
<EXPENSES-NET> 0
<NET-INVESTMENT-INCOME> (19,332)
<REALIZED-GAINS-CURRENT> 2,504,658
<APPREC-INCREASE-CURRENT> 1,250,224
<NET-CHANGE-FROM-OPS> 3,735,550
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 8,655
<DISTRIBUTIONS-OF-GAINS> 4,600,579
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 230,442
<NUMBER-OF-SHARES-REDEEMED> 228,415
<SHARES-REINVESTED> 170,772
<NET-CHANGE-IN-ASSETS> 3,805,333
<ACCUMULATED-NII-PRIOR> 5,152
<ACCUMULATED-GAINS-PRIOR> 2,512,915
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 246,986
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 247,552
<AVERAGE-NET-ASSETS> 24,717,140
<PER-SHARE-NAV-BEGIN> 33.46 <F2>
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 4.70 <F2>
<PER-SHARE-DIVIDEND> 0.01 <F2>
<PER-SHARE-DISTRIBUTIONS> 7.07 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 31.06 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 4
<NAME> TWENTIETH CENTURY VISTA FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998
<INVESTMENTS-AT-COST> 877,417
<INVESTMENTS-AT-VALUE> 909,227
<RECEIVABLES> 32,049
<ASSETS-OTHER> 2,295
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 943,571
<PAYABLE-FOR-SECURITIES> 41,346
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,932
<TOTAL-LIABILITIES> 44,278
<SENIOR-EQUITY> 970
<PAID-IN-CAPITAL-COMMON> 898,405
<SHARES-COMMON-STOCK> 96,974
<SHARES-COMMON-PRIOR> 111,989
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (31,893)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 31,811
<NET-ASSETS> 899,293
<DIVIDEND-INCOME> 3,635
<INTEREST-INCOME> 4,389
<OTHER-INCOME> 0
<EXPENSES-NET> 13,931
<NET-INVESTMENT-INCOME> (5,907)
<REALIZED-GAINS-CURRENT> (27,871)
<APPREC-INCREASE-CURRENT> (416,761)
<NET-CHANGE-FROM-OPS> (450,539)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 99,553
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 99,796
<NUMBER-OF-SHARES-REDEEMED> 138,051
<SHARES-REINVESTED> 8,020
<NET-CHANGE-IN-ASSETS> (948,929)
<ACCUMULATED-NII-PRIOR> (3,567)
<ACCUMULATED-GAINS-PRIOR> 192,261
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 13,890
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 13,931
<AVERAGE-NET-ASSETS> 1,391,040
<PER-SHARE-NAV-BEGIN> 14.53 <F2>
<PER-SHARE-NII> (0.05)<F2>
<PER-SHARE-GAIN-APPREC> (4.41)<F2>
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.80 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.27 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE RELFECTS THE TOTAL FOR AL INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 5
<NAME> TWENTIETH CENTURY GIFTRUST FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 735,471
<INVESTMENTS-AT-VALUE> 746,826
<RECEIVABLES> 25,271
<ASSETS-OTHER> 879
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 772,976
<PAYABLE-FOR-SECURITIES> 13,749
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,823
<TOTAL-LIABILITIES> 15,572
<SENIOR-EQUITY> 450
<PAID-IN-CAPITAL-COMMON> 892,627
<SHARES-COMMON-STOCK> 44,961
<SHARES-COMMON-PRIOR> 43,539
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (148,701)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13,028
<NET-ASSETS> 757,404
<DIVIDEND-INCOME> 1,641
<INTEREST-INCOME> 2,824
<OTHER-INCOME> 0
<EXPENSES-NET> 9,594
<NET-INVESTMENT-INCOME> (5,129)
<REALIZED-GAINS-CURRENT> (147,006)
<APPREC-INCREASE-CURRENT> (188,500)
<NET-CHANGE-FROM-OPS> (340,635)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 30,706
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,100
<NUMBER-OF-SHARES-REDEEMED> 740
<SHARES-REINVESTED> 1,395
<NET-CHANGE-IN-ASSETS> (266,236)
<ACCUMULATED-NII-PRIOR> (2,572)
<ACCUMULATED-GAINS-PRIOR> 1,992
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,585
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,594
<AVERAGE-NET-ASSETS> 958,477
<PER-SHARE-NAV-BEGIN> 25.46
<PER-SHARE-NII> (0.12)
<PER-SHARE-GAIN-APPREC> (7.74)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.75
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.85
<EXPENSE-RATIO> 1.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1> SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2> INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 8
<NAME> BENHAM BOND FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 140,466
<INVESTMENTS-AT-VALUE> 145,221
<RECEIVABLES> 4,474
<ASSETS-OTHER> 64
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 149,759
<PAYABLE-FOR-SECURITIES> 1,490
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 620
<TOTAL-LIABILITIES> 2,110
<SENIOR-EQUITY> 151
<PAID-IN-CAPITAL-COMMON> 142,721
<SHARES-COMMON-STOCK> 15,113
<SHARES-COMMON-PRIOR> 13,842
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 22
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4,755
<NET-ASSETS> 147,649
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9,177
<OTHER-INCOME> 0
<EXPENSES-NET> 1,105
<NET-INVESTMENT-INCOME> 0
<REALIZED-GAINS-CURRENT> 47
<APPREC-INCREASE-CURRENT> 699
<NET-CHANGE-FROM-OPS> 8,818
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 8,072
<DISTRIBUTIONS-OF-GAINS> 369
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,780
<NUMBER-OF-SHARES-REDEEMED> 7,532
<SHARES-REINVESTED> 807
<NET-CHANGE-IN-ASSETS> 20,606
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (93)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,096
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,105
<AVERAGE-NET-ASSETS> 137,489
<PER-SHARE-NAV-BEGIN> 9.73 <F2>
<PER-SHARE-NII> 0.57 <F2>
<PER-SHARE-GAIN-APPREC> 0.07 <F2>
<PER-SHARE-DIVIDEND> 0.57 <F2>
<PER-SHARE-DISTRIBUTIONS> 0.03 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.77 <F2>
<EXPENSE-RATIO> 0.80 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1> SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2> INVESTOR CLASS INFORMATION ONLY.
</FN>
</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 IS ITS ENTIRETY
BY REFERENCE TO SUCH REPORT. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 11
<NAME> AMERICAN CENTURY-TWENTIETH CENTURY HERITAGE FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 919,119
<INVESTMENTS-AT-VALUE> 1,001,260
<RECEIVABLES> 49,736
<ASSETS-OTHER> 4,682
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,055,678
<PAYABLE-FOR-SECURITIES> 68,514
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7,913
<TOTAL-LIABILITIES> 76,427
<SENIOR-EQUITY> 981
<PAID-IN-CAPITAL-COMMON> 903,789
<SHARES-COMMON-STOCK> 98,124
<SHARES-COMMON-PRIOR> 110,043
<ACCUMULATED-NII-CURRENT> 1,960
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (9,673)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 82,194
<NET-ASSETS> 979,251
<DIVIDEND-INCOME> 11,683
<INTEREST-INCOME> 4,445
<OTHER-INCOME> 0
<EXPENSES-NET> 12,506
<NET-INVESTMENT-INCOME> 3,622
<REALIZED-GAINS-CURRENT> (10,571)
<APPREC-INCREASE-CURRENT> (186,843)
<NET-CHANGE-FROM-OPS> (193,792)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 6,442
<DISTRIBUTIONS-OF-GAINS> 241,225
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 31,729
<NUMBER-OF-SHARES-REDEEMED> 44,431
<SHARES-REINVESTED> 21,908
<NET-CHANGE-IN-ASSETS> (342,264)
<ACCUMULATED-NII-PRIOR> 1,055
<ACCUMULATED-GAINS-PRIOR> 118,557
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 12,490
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 12,506
<AVERAGE-NET-ASSETS> 1,249,191
<PER-SHARE-NAV-BEGIN> 14.86 <F2>
<PER-SHARE-NII> 0.03 <F2>
<PER-SHARE-GAIN-APPREC> 2.14 <F2>
<PER-SHARE-DIVIDEND> 0.07 <F2>
<PER-SHARE-DISTRIBUTIONS> 2.70 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.98 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 12
<NAME> AMERICAN CENTURY BALANCED FUND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 805,394
<INVESTMENTS-AT-VALUE> 938,287
<RECEIVABLES> 7,007
<ASSETS-OTHER> 3,292
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 948,586
<PAYABLE-FOR-SECURITIES> 1,738
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,984
<TOTAL-LIABILITIES> 3,722
<SENIOR-EQUITY> 48,712
<PAID-IN-CAPITAL-COMMON> 660,437
<SHARES-COMMON-STOCK> 48,732
<SHARES-COMMON-PRIOR> 49,913
<ACCUMULATED-NII-CURRENT> 2,690
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 96,773
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 136,252
<NET-ASSETS> 944,864
<DIVIDEND-INCOME> 3,933
<INTEREST-INCOME> 26,326
<OTHER-INCOME> 0
<EXPENSES-NET> 9,590
<NET-INVESTMENT-INCOME> 20,669
<REALIZED-GAINS-CURRENT> 101,331
<APPREC-INCREASE-CURRENT> (26,549)
<NET-CHANGE-FROM-OPS> 96,451
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 20,854
<DISTRIBUTIONS-OF-GAINS> 76,004
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9,611
<NUMBER-OF-SHARES-REDEEMED> 13,779
<SHARES-REINVESTED> 5,245
<NET-CHANGE-IN-ASSETS> 13,003
<ACCUMULATED-NII-PRIOR> 2,294
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 86,391
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,549
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,590
<AVERAGE-NET-ASSETS> 956,481
<PER-SHARE-NAV-BEGIN> 19.55 <F2>
<PER-SHARE-NII> 0.42 <F2>
<PER-SHARE-GAIN-APPREC> 1.45 <F2>
<PER-SHARE-DIVIDEND> 0.43 <F2>
<PER-SHARE-DISTRIBUTIONS> 1.60 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 19.39 <F2>
<EXPENSE-RATIO> 1.00 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 14
<NAME> BENHAM LIMITED-TERM BOND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 19,197
<INVESTMENTS-AT-VALUE> 19,440
<RECEIVABLES> 315
<ASSETS-OTHER> 2
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 19,757
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 73
<TOTAL-LIABILITIES> 73
<SENIOR-EQUITY> 20
<PAID-IN-CAPITAL-COMMON> 19,329
<SHARES-COMMON-STOCK> 1,959
<SHARES-COMMON-PRIOR> 1,759
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 92
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 243
<NET-ASSETS> 19,684
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,187
<OTHER-INCOME> 0
<EXPENSES-NET> 134
<NET-INVESTMENT-INCOME> 1,053
<REALIZED-GAINS-CURRENT> 92
<APPREC-INCREASE-CURRENT> 115
<NET-CHANGE-FROM-OPS> 1,260
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,053
<DISTRIBUTIONS-OF-GAINS> 28
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,870
<NUMBER-OF-SHARES-REDEEMED> 1,544
<SHARES-REINVESTED> 103
<NET-CHANGE-IN-ASSETS> 4,415
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 75
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 132
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 134
<AVERAGE-NET-ASSETS> 18,989
<PER-SHARE-NAV-BEGIN> 9.98 <F2>
<PER-SHARE-NII> 0.55 <F2>
<PER-SHARE-GAIN-APPREC> 0.08 <F2>
<PER-SHARE-DIVIDEND> 0.55 <F2>
<PER-SHARE-DISTRIBUTIONS> 0.01 <F2>
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.05 <F2>
<EXPENSE-RATIO> 0.70 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1> SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2> INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 15
<NAME> BENHAM INTERMEDIATE-TERM BOND
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 28,804
<INVESTMENTS-AT-VALUE> 29,402
<RECEIVABLES> 493
<ASSETS-OTHER> 375
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 30,270
<PAYABLE-FOR-SECURITIES> 248
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 75
<TOTAL-LIABILITIES> 323
<SENIOR-EQUITY> 29
<PAID-IN-CAPITAL-COMMON> 29,127
<SHARES-COMMON-STOCK> 2,926
<SHARES-COMMON-PRIOR> 2,319
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 193
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 598
<NET-ASSETS> 29,947
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,552
<OTHER-INCOME> 0
<EXPENSES-NET> 187
<NET-INVESTMENT-INCOME> 1,365
<REALIZED-GAINS-CURRENT> 179
<APPREC-INCREASE-CURRENT> 206
<NET-CHANGE-FROM-OPS> 1,750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,365
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,135
<NUMBER-OF-SHARES-REDEEMED> 1,330
<SHARES-REINVESTED> 122
<NET-CHANGE-IN-ASSETS> 9,804
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 126
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 173
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 187
<AVERAGE-NET-ASSETS> 23,934
<PER-SHARE-NAV-BEGIN> 10.07 <F2>
<PER-SHARE-NII> 0.58 <F2>
<PER-SHARE-GAIN-APPREC> 0.17 <F2>
<PER-SHARE-DIVIDEND> 0.58 <F2>
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.24 <F2>
<EXPENSE-RATIO> 0.75 <F2>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1> SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2> INVESTOR CLASS INFORMATION ONLY.
</FN>
</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 IS ITS ENTIRETY
BY REFERENCE TO SUCH REPORT. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 17
<NAME> TWENTIETH CENTURY NEW OPPORTUNITIES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998
<INVESTMENTS-AT-COST> 197,430
<INVESTMENTS-AT-VALUE> 211,340
<RECEIVABLES> 6,482
<ASSETS-OTHER> 370
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 218,192
<PAYABLE-FOR-SECURITIES> 4,245
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 456
<TOTAL-LIABILITIES> 4,701
<SENIOR-EQUITY> 448
<PAID-IN-CAPITAL-COMMON> 212,378
<SHARES-COMMON-STOCK> 44,797
<SHARES-COMMON-PRIOR> 45,336
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (13,708)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14,373
<NET-ASSETS> 213,491
<DIVIDEND-INCOME> 249
<INTEREST-INCOME> 579
<OTHER-INCOME> 0
<EXPENSES-NET> 3,608
<NET-INVESTMENT-INCOME> (2,780)
<REALIZED-GAINS-CURRENT> (9,957)
<APPREC-INCREASE-CURRENT> (12,322)
<NET-CHANGE-FROM-OPS> (25,059)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,852
<NUMBER-OF-SHARES-REDEEMED> 7,584
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (17,775)
<ACCUMULATED-NII-PRIOR> (1,455)
<ACCUMULATED-GAINS-PRIOR> 3,026
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,606
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,608
<AVERAGE-NET-ASSETS> 240,392
<PER-SHARE-NAV-BEGIN> 5.31
<PER-SHARE-NII> (0.06)
<PER-SHARE-GAIN-APPREC> (0.48)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 4.77
<EXPENSE-RATIO> 1.50
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1>SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2>INVESTOR CLASS INFORMATION ONLY.
</FN>
</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. INFORMATION PRESENTED IS A TOTAL OF ALL CLASSES,
EXCEPT WHERE SUCH PRESENTATION IS NOT POSSIBLE(SUCH AS PER SHARE DATA). IN THOSE
CASES, ONLY THE INVESTOR CLASS INFORMATION IS PRESENTED.
</LEGEND>
<CIK> 0000100334
<NAME> AMERICAN CENTURY MUTUAL FUNDS, INC.
<SERIES>
<NUMBER> 18
<NAME> BENHAM HIGH YIELD FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> OCT-31-1998 <F1>
<INVESTMENTS-AT-COST> 36,034,249
<INVESTMENTS-AT-VALUE> 31,243,399
<RECEIVABLES> 1,188,539
<ASSETS-OTHER> 380,312
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 32,812,250
<PAYABLE-FOR-SECURITIES> 496,620
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 86,697
<TOTAL-LIABILITIES> 583,317
<SENIOR-EQUITY> 36,923
<PAID-IN-CAPITAL-COMMON> 36,952,881
<SHARES-COMMON-STOCK> 3,692,330
<SHARES-COMMON-PRIOR> 2,878,065
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 29,979
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (4,790,850)
<NET-ASSETS> 32,228,933
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,536,595
<OTHER-INCOME> 0
<EXPENSES-NET> 245,334
<NET-INVESTMENT-INCOME> 2,291,261
<REALIZED-GAINS-CURRENT> 29,979
<APPREC-INCREASE-CURRENT> (4,679,178)
<NET-CHANGE-FROM-OPS> (2,357,938)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2,291,261
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,938,245
<NUMBER-OF-SHARES-REDEEMED> 3,564,707
<SHARES-REINVESTED> 200,982
<NET-CHANGE-IN-ASSETS> 21,156,941
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 120,289
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 245,103
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 245,334
<AVERAGE-NET-ASSETS> 27,233,651
<PER-SHARE-NAV-BEGIN> 9.91
<PER-SHARE-NII> 0.83
<PER-SHARE-GAIN-APPREC> (1.18)
<PER-SHARE-DIVIDEND> 0.83
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 8.73
<EXPENSE-RATIO> 0.90
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
<FN>
<F1> SCHEDULE REFLECTS THE TOTAL FOR ALL CLASSES, EXCEPT WHERE INDICATED.
<F2> INVESTOR CLASS INFORMATION ONLY.
</FN>
</TABLE>
