AMERICAN CENTURY MUTUAL FUNDS INC
N-30D, 1999-06-25
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[front cover]
                                                                 APRIL 30, 1999

SEMIANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- -----------------------
BALANCED

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century


[inside front cover]

AMERICAN CENTURY KEEPS WITH TRADITION
- --------------------------------------------------------------------------------

FOLLOWING BENHAM'S FOOTSTEPS

On March 1, we made it easier for you to do business with us. We simplified  our
organizational  structure by  eliminating  the  venerable  Benham and  Twentieth
Century names, and putting all our funds under American Century. The name change
will not affect your funds' investment  management--the proven Benham investment
philosophy, experienced portfolio management teams, and legacy of innovation and
high-quality performance remain.

CONSISTENT,  SOLID  PERFORMANCE--We'll  continue  to  adhere  to the  investment
practices  that have  helped  our  fixed-income  funds  perform so well over the
years. In 1998,  two-thirds of American Century bond funds beat their peer group
average, according to Lipper, Inc.

CONSISTENT  INVESTMENT  PHILOSOPHY--American  Century  fixed-income  funds  will
continue to offer a "pure play" on their sector of the market, as they did under
Benham.

CONTINUITY  OF THE  MANAGEMENT  TEAM--The  investment  process  is not all  that
remains  the same;  we've  retained  our core team of  experienced  fixed-income
portfolio managers.

    *  Experience--The  more than 35 fixed-income  investment  professionals  at
       American  Century have an average of nine years of investment  management
       experience.

    *  Bigger and better--Since  American Century was formed,  we've doubled the
       size  of the  original  Benham  management  team  in our  Mountain  View,
       California office.

TRADITION OF INNOVATION--Like  Benham before it, American Century is a leader in
fixed-income  fund  innovation.  For example,  we introduced a total of four new
fixed-income  funds  in the  last  three  years,  including  the  first  no-load
inflation-adjusted bond fund.

We continue to run our fixed-income operation from our offices in Mountain View,
California, which is also home to our walk-in Investor Center.

We look forward to continuing to meet your fixed-income  investment needs in the
Benham tradition.

WHAT'S NEW . . .

     We now classify our funds in easy-to-remember categories based on objective
and risk. The four  objective  categories  are:  CAPITAL  PRESERVATION,  INCOME,
GROWTH AND INCOME,  and GROWTH.  The three risk  categories  are:  CONSERVATIVE,
MODERATE,  and AGGRESSIVE.  This new  classification  system makes it easier for
investors to identify which funds are right for them.

     Turn to the  inside  back  cover of this  report to see a list of the funds
classified by objective and risk. For  definitions of the fund  categories,  see
the Glossary.

Past performance is no guarantee of future results.

[left margin]

BALANCED
(TWBIX)
- ------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     During the six months ended April 30, 1999,  we witnessed  some  surprising
events in the U.S. financial  markets.  When we last addressed you in the annual
report for American  Century  Balanced,  the Federal  Reserve (the U.S.  central
bank) had just cut  short-term  interest  rates  three times to bolster the U.S.
economy and help  stabilize  markets  worldwide.  This came after  economic  and
financial crises in Asia,  Russia,  and Latin America,  and the near collapse of
several hedge funds. The global economic outlook was still quite uncertain.

     But the Fed's actions helped turn things around. By January 1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence  had rebounded.  Investors,  many of whom had shifted their
holdings into U.S. Treasury  securities,  moved out of Treasurys into stocks and
higher-yielding   bonds.  Interest  rates  rose  while  the  U.S.  stock  market
soared--the Dow Jones Industrial  Average broke through 10,000 by the end of the
first quarter.

     The year also began on an up note for us. We  continued  to focus on making
American  Century easier to do business with and helping  investors  reach their
financial  goals.  In March,  we  consolidated  all our funds under the American
Century name. Though we are proud of the venerable  Twentieth Century and Benham
names, we believe the change makes it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In addition,  we enhanced our Web site  (www.americancentury.  com).  There
you'll find daily fund information--including performance and price data--market
and national news, and a Forms Center with access to the most-requested investor
forms and  applications.  You can also sign up to receive fund  prospectuses and
shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has doubled over the last three years. Our portfolio teams have excellent depth,
with an array of experienced  managers and analysts,  and we remain committed to
building  and  maintaining  a  talented  management  group.  Performance  is too
hard-won, and our business too competitive, not to do so.

     As always, we appreciate your continued confidence in American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer

[right margin]

                 Table of Contents
   Report Highlights ......................................................    2
   Market Perspective .....................................................    3
BALANCED
   Performance Information ................................................    5
   Management Q&A .........................................................    6
   Types of Investments ...................................................    6
   Top Ten Stock Holdings .................................................    7
   Top Five Stock Industries ..............................................    7
   Fixed-Income Portfolio .................................................    8
   Schedule of Investments ................................................    9
FINANCIAL STATEMENTS
   Statement of Assets and
      Liabilities .........................................................   15
   Statement of Operations ................................................   16
   Statements of Changes
      in Net Assets .......................................................   17
   Notes to Financial
      Statements ..........................................................   18
   Financial Highlights ...................................................   22
OTHER INFORMATION
   Share Class and Retirement
      Account Information .................................................   24
   Background Information
      Investment Philosophy and
         Policies .........................................................   25
      Comparative Indices .................................................   25
      Investment Team
         Leaders ..........................................................   25
      Credit Rating
         Guidelines .......................................................   25
   Glossary ...............................................................   26


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   The U.S. stock and bond markets diverged during the six months ended April
    30, 1999. Stocks generally rallied while bonds were mostly flat to lower.

*   Three short-term interest rate cuts by the Federal Reserve in late 1998
    helped bolster the U.S. economy and investor confidence, lending strength to
    stocks.

*   Large-capitalization  growth stocks such as Microsoft  still provided market
    leadership,  but not as  convincingly  as in past  periods.  Mid- cap stocks
    nearly  kept  pace  with  large-cap  issues,  and even the  much-beleaguered
    small-cap stock indices posted respectable returns.

*   Value stocks generally  outperformed growth stocks for the first four months
    of 1999, reversing another recent trend.

*   Cyclical  stocks  staged  a  comeback  as  investors  regained  faith in the
    strength  and growth of the global  economy.  High-tech  and  pharmaceutical
    stocks fell somewhat out of favor.

*   Strong U.S. economic growth and rising interest rates caused low returns for
    most bonds, especially Treasury securities.

*   Corporate bonds and  mortgage-backed  securities  benefited from demand from
    yield-oriented investors who sold Treasurys as economic conditions improved.

MANAGEMENT Q&A

*   Balanced's  return for the six months ended April 30 reflected  the strength
    of the stock market and the relative weakness of bonds.

*   The fund's equity portfolio  returned nearly 16% for the six months,  but it
    wasn't enough to match the sizzling pace of the S&P 500.

*   Balanced's stock portfolio had more of a smaller-company  and value-oriented
    bias than the S&P 500, which is one reason it trailed the index.

*   The equity  portfolio  also lost some ground  because of an  underweight  in
    energy  securities  and  overweighted  positions in interest  rate-sensitive
    electric utilities, property insurance, and construction stocks.

*   Balanced benefited from overweighted positions in Microsoft, America Online,
    and AT&T,  as well as large  positions  in  financial  services  and banking
    stocks such as Chase Manhattan and Morgan Stanley Dean Witter.

*   We're  bringing our industry  positions in the stock  portfolio more in line
    with the S&P 500.  We plan to focus  more on  stock  selection  within  each
    industry.

*   The  performance of the bond portfolio  basically  matched the return of its
    new benchmark, the Lehman Brothers Aggregate Bond Index.

*   We switched to the new index because we believe it better represents the
    broader U.S. taxable bond market.

*   The  portfolio  now holds  fewer  corporate  bonds and more  mortgage-backed
    securities.

*   We began to  invest a small  portion  of the  corporate  bond  portfolio  in
    securities  rated BB, an area where we think we can add value and boost fund
    performance.

*   We'll continue to move the fixed-income portfolio closer to the new index.

[left margin]

"BALANCED BENEFITED FROM OVERWEIGHTED POSITIONS IN MICROSOFT, AMERICA ONLINE,
AND AT&T, AS WELL AS LARGE POSITIONS IN FINANCIAL SERVICES AND BANKING STOCKS
SUCH AS CHASE MANHATTAN AND MORGAN STANLEY DEAN WITTER."

                  BALANCED(1)
                    (TWBIX)
TOTAL RETURNS:                  AS OF 4/30/99
    6 Months                         9.64%(2)
    1 Year                             10.05%
30-DAY SEC YIELD:                       2.39%
INCEPTION DATE:                      10/20/88
NET ASSETS:                 $960.0 million(3)

(1)  Investor Class.
(2)  Not annualized.
(3)  Includes Investor and Advisor Classes.

See Total Returns on page 5.
Investment terms are defined in the Glossary on pages 26-27.


2      1-800-345-2021


Market Perspective from Mark Mallon
- --------------------------------------------------------------------------------
/photo of Mark Mallon/
Mark Mallon, head of growth and income equity,  specialty,  and asset allocation
funds at American Century

STOCKS AND BONDS DIVERGE

     During the six months ended April 30, 1999,  a resilient  U.S.  economy and
revitalized  investor  confidence  spurred a U.S.  stock  market  rebound  while
simultaneously  pushing up interest  rates and dampening  domestic bond returns.
This divergence in stock and bond  performance is displayed  dramatically in the
returns for the S&P 500 and the Lehman  Aggregate  Bond Index in the graphics at
the right.  The  blended  index  shows how a 60% S&P  500/40%  Lehman  Aggregate
combination would have performed.

RECALLING THE PANIC

     It's  fascinating  how much  conditions  can change in just six months.  In
October  1998,  the U.S.  financial  markets were still reeling from a startling
third  quarter  that had seen equity  markets  plunge  worldwide  in response to
global credit and financial  crises,  particularly  in Asia,  Russia,  and Latin
America,  and the  threatened  collapse of several hedge funds.  Many  investors
pulled their money out of equities and foreign investments and opted instead for
the relative  safety and liquidity of U.S.  Treasury  securities.  Treasury bond
yields  plummeted to record lows, and Treasury bond prices  soared.  But not all
bond  sectors   shared   equally  in  this  rally.   Demand  for  corporate  and
mortgage-backed  securities  dropped  dramatically,  and their  returns fell far
below those of Treasurys.

THE TURNAROUND

     But even as  Treasury  returns  blossomed,  the seeds of change  were being
planted.  The Federal Reserve,  the U.S.  central bank, cut short-term  interest
rates  three  times  to  ease  the  credit  crisis  and  spur  economic  growth.
Furthermore,  the  U.S.  economy  and  its  driving  force,  consumer  spending,
demonstrated  remarkable  staying  power.  U.S.  economic  growth in the  fourth
quarter of 1998 and the first  quarter of 1999 was far stronger  than  expected,
and foreign  economies showed signs of stabilization and recovery in early 1999.
As a result, by the end of the first quarter, the venerable Dow Jones Industrial
Average  had  rocketed  past  10,000,  signaling  happier  days for  U.S.  stock
investors.

INSIDE THE STOCK MARKET'S RETURNS

     Not all stock investors were equally happy,  however.  Small-company stocks
continued to lag big-company stocks. The S&P SmallCap 600 Index was up 9.03% for
the six-month period, a respectable  return, but well behind the blistering pace
of the S&P 500, which was up 22.31%. Mid-sized companies also lagged, but not by
nearly as much--the S&P MidCap 400 gained 18.86% during the same span. Both mid-
and small-company stocks began to be perceived as undervalued and drew investors
away from big-company stocks,

[right margin]

"A RESILIENT U.S. ECONOMY AND REVITALIZED INVESTOR CONFIDENCE SPURRED A U.S.
STOCK MARKET REBOUND WHILE SIMULTANEOUSLY PUSHING UP INTEREST RATES AND
DAMPENING DOMESTIC BOND RETURNS."

MARKET RETURNS
FOR THE SIX MONTHS ENDED APRIL 30, 1999
   S&P 500                      22.31%
   BLENDED INDEX                13.67%
   LEHMAN BROS. AGGREGATE
      BOND INDEX                 0.69%

Source: Lipper Inc.

[line graph - data below]

MARKET PERFORMANCE (GROWTH OF $1.00)
FOR THE SIX MONTHS ENDED APRIL 30, 1999
                                  Lehman Bros.
                   S&P 500           Blended Index     Aggregate Bond Index
10/31/98            $1.00                $1.00                $1.00
11/30/98            $1.06                $1.04                $1.01
12/31/98            $1.12                $1.08                $1.01
1/31/99             $1.17                $1.11                $1.02
2/28/99             $1.13                $1.08                $1.00
3/31/99             $1.18                $1.11                $1.00
4/30/99             $1.22                $1.14                $1.01

Source: Lipper Inc.

These indices are defined on page 25.


                                                  www.americancentury.com      3


Market Perspective
- --------------------------------------------------------------------------------
                                                                    (Continued)
which were seen as becoming increasingly pricey.

     Similarly,  value stocks (also  considered  to be  relatively  inexpensive)
gained  ground at the  expense  of  growth  stocks  (issued  by  companies  with
above-average earnings growth).  Growth stocks had been in favor during the past
three years,  but that changed in 1999.  For the first four months of 1999,  the
S&P  500/BARRA  Value Index  clearly  outpaced the S&P  500/BARRA  Growth Index,
11.24% to 6.68%.  Most of the performance  disparity was focused in April,  when
the S&P 500/BARRA  Value Index was up 8.62%  compared to a -0.19% return for the
S&P 500/BARRA Growth Index.

THE RETURN TO CYCLICALS

     Another big U.S.  stock  story was sector  rotation.  It became  clearer by
April  that the global  economy in general  was  regaining  some  strength,  and
cyclical  stocks  (whose price and earnings  tend to follow the ups and downs of
the economy)  made a comeback.  Investors  put faith in the growth of the global
economy by investing in the stocks of basic materials  producers--such as paper,
metal,  and mining  companies--that  rely heavily on global  economic growth for
their profitability.

     While buying these deep cyclical stocks,  investors sold previous favorites
such as high-tech and pharmaceutical stocks. High-tech investors were spooked in
April when Compaq Computer announced that first-quarter profits would be half of
analysts'  estimates.  Pharmaceuticals  were  hit  by a  wave  of  selling  when
investors  stopped  feeling  they  needed  the  stable  earnings  and  recession
protection that drug company stocks can offer.

TREASURYS CORRECTED

     A bond version of sector rotation began earlier in the year. By early 1999,
bond investors generally sensed that the gloomiest economic predictions were not
coming true, and they became more interested in higher yields than in safety and
liquidity.  As  a  result,   bondholders  began  selling  Treasurys  and  buying
higher-yielding bonds such as corporate and mortgage-backed  securities.  As you
can see in the  accompanying  table and graph,  corporates and  mortgage-backeds
outperformed Treasurys, and Treasury yields rose significantly.

     U.S.  bond returns were  generally  quite low for the  six-month  period as
strong  economic  growth  translated  into fears of future  inflation and higher
interest  rates.  During the period,  bond sentiment  changed  dramatically.  In
November, many analysts still thought that the Federal Reserve would have to cut
interest  rates again in 1999 to bolster the economy.  By the end of April,  the
speculation  had  switched  180 degrees to  concerns  that the Fed might have to
raise interest rates by the end of 1999 to ward off inflation.

[left margin]

"U.S. BOND RETURNS WERE GENERALLY QUITE LOW FOR THE SIX-MONTH PERIOD AS STRONG
ECONOMIC GROWTH TRANSLATED INTO FEARS  OF FUTURE INFLATION AND HIGHER INTEREST
RATES."

[line graph - data below]

RISING TREASURY YIELD CURVE

                 10/31/98              4/30/99
YEARS TO
MATURITY
1                 4.38%                 4.96%
2                 4.26%                 5.09%
3                 4.34%                 5.18%
4                 4.38%                 5.28%
5                 4.32%                 5.22%
6                 4.39%                 5.32%
7                 4.46%                 5.42%
8                 4.49%                 5.39%
9                 4.52%                 5.36%
10                4.54%                 5.32%
11                4.65%                 5.41%
12                4.76%                 5.50%
13                4.89%                 5.59%
14                4.99%                 5.68%
15                5.08%                 5.77%
16                5.12%                 5.80%
17                5.17%                 5.83%
18                5.21%                 5.86%
19                5.26%                 5.89%
20                5.30%                 5.93%
21                5.32%                 5.93%
22                5.34%                 5.92%
23                5.35%                 5.92%
24                5.37%                 5.91%
25                5.38%                 5.90%
26                5.33%                 5.86%
27                5.28%                 5.82%
28                5.23%                 5.78%
29                5.18%                 5.74%
30                5.14%                 5.71%

Source: Bloomberg Financial Markets

BOND INDEX RETURNS
FOR THE SIX MONTHS ENDED APRIL 30, 1999
   LEHMAN BROS. AGGREGATE
      BOND INDEX                        0.69%
   LEHMAN BROS. CORPORATE
      BOND INDEX                        1.75%
   LEHMAN BROS. MORTGAGE-
      BACKED SECURITIES INDEX           2.39%
   LEHMAN BROS. TREASURY
      BOND INDEX                       -1.21%

Source: Russell/Mellon Analytical


4      1-800-345-2021


Balanced--Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF APRIL 30, 1999

                   INVESTOR CLASS (INCEPTION 10/20/88)   ADVISOR CLASS (INCEPTION 1/6/97)
                      BALANCED    BLENDED INDEX(2)          BALANCED    BLENDED INDEX
<S>                    <C>           <C>                     <C>           <C>
6 MONTHS(1)             9.64%         13.67%                  9.50%         13.67%
1 YEAR                 10.05%         15.60%                  9.77%         15.60%
=======================================================================================
AVERAGE ANNUAL RETURNS
=======================================================================================
3 YEARS                15.08%         20.68%                   --              --
5 YEARS                13.84%         19.35%                   --              --
10 YEARS               12.93%         14.85%                   --              --
LIFE OF FUND           12.80%         15.00%(3)              14.51%         20.29%(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) The bond  portion  of the  blended  index has been  changed  from the Lehman
    Brothers  Intermediate  Government/Corporate  Index to the  Lehman  Brothers
    Aggregate Bond Index,  which we believe  better  represents the broader U.S.
    taxable bond market.

(3) Return from 10/31/88,  the date nearest the class's inception for which data
    are available.

(4) Return from 1/31/97,  the date nearest the class's  inception for which data
    are available.

See pages 24-26 for  information  about share classes,  the Blended  Index,  and
returns.

[mountain graph - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 4/30/99
New Blended Index      $40,260
Old Blended Index      $39,321
Balanced               $33,766

                    Balanced       Old Blended Index    New Blended Index
DATE                 VALUE               VALUE               VALUE
4/30/89             $10,000             $10,000             $10,000
4/30/90             $11,356             $10,987             $10,994
4/30/91             $13,734             $12,749             $12,825
4/30/92             $16,000             $14,361             $14,469
4/30/93             $16,333             $15,867             $16,038
4/30/94             $17,654             $16,439             $16,605
4/30/95             $18,856             $18,590             $18,831
4/30/96             $22,158             $22,543             $22,895
4/30/97             $24,427             $26,519             $26,996
4/30/98             $30,683             $34,003             $34,827
4/30/99             $33,766             $39,321             $40,260

$10,000 investment made 4/30/89

The graph at left shows the growth of a $10,000  investment  in the fund over 10
years, while the graph below shows the fund's year-by-year performance. Both the
old and new blended indices are provided for comparison in the graph at left. In
future  reports,  only  the new  blended  index  will be  used  for  performance
comparisons.  Balanced's  total  returns  include  operating  expenses  (such as
transaction  costs and  management  fees) that reduce  returns,  while the total
returns of the indices do not.  These graphs are based on Investor  Class shares
only;  performance  for  other  classes  will  vary  due to  differences  in fee
structures (see Total Returns table above).  Past performance does not guarantee
future  results.  Investment  return and  principal  value will  fluctuate,  and
redemption value may be more or less than original cost.

[bar graph - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDED APRIL 30)

                      Balanced          New Blended Index
DATE                   RETURN                RETURN
4/30/90                13.56%                 9.94%
4/30/91                20.94%                16.65%
4/30/92                16.50%                12.82%
4/30/93                 2.08%                10.85%
4/30/94                 8.09%                 3.53%
4/30/95                 6.81%                13.41%
4/30/96                17.51%                21.58%
4/30/97                10.24%                17.91%
4/30/98                25.61%                29.01%
4/30/99                10.05%                15.60%


                                                  www.americancentury.com      5


Balanced--Q&A
- --------------------------------------------------------------------------------
/photo of John Schniedwind, Jeff Tyler/
Equity team: John Schniedwind, Jeff Tyler

/photo of Bud Hoops, Jeff Houston/
Fixed-income team: Bud Hoops, Jeff Houston

     Based on  interviews  with John  Schniedwind  and Jeff  Houston,  portfolio
managers on the Balanced fund investment teams (pictured above).

HOW DID THE FUND PERFORM FOR THE SIX MONTHS ENDED APRIL 30?

     Balanced's  portfolio of  approximately  60% U.S. stocks and 40% U.S. bonds
returned  9.64%.*  Balanced's stock holdings  returned  15.79%,  while the bonds
returned 0.74%.  Balanced's benchmark (a blended index that combines the S&P 500
and the Lehman Brothers  Aggregate Bond Index in the same 60%/40%  proportion as
the asset mix of the  portfolio)  returned  13.67%.  This reflected the combined
22.31% return of the S&P 500 and the 0.69% return of the Aggregate Bond index.

WHAT CAUSED THE RETURN DIFFERENTIAL BETWEEN THE FUND AND THE BLENDED INDEX?

     The S&P 500 outperformed  Balanced's  equity  portfolio.  The stock index's
performance  continued to be dominated by a small group of  large-capitalization
(large-company) growth stocks, such as IBM, Sun Microsystems,  MCI Worldcom, and
Cisco  Systems.  Balanced owned these stocks and they were among the fund's best
performing  holdings,  but they were  underweighted in the portfolio relative to
their weighting in the index.

     That's because Balanced, which has been managed according to a quantitative
style since November 1, 1998, had more of a smaller-company  and  value-oriented
bias than the S&P 500. The fund's stock  valuation  model ranked  mid-sized  and
small-company  issues  as more  attractive  than  bigger,  higher-priced  growth
companies.   Unfortunately,   many  of  the  stocks  highlighted  by  the  model
underperformed large-cap growth stocks until late in the period.

WERE THERE OTHER FACTORS THAT CAUSED FUND PERFORMANCE TO DIVERGE FROM  THE
INDEX?

     Rising  interest rates was another key factor that adversely  affected fund
performance.  We were overweighted in three areas that are sensitive to interest
rates.  For  example,  Balanced  had a sizable  position in  electric  utilities
stocks, such as Southern Co. and Sempra Energy, which generally performed poorly
during the first quarter of 1999 as rates rose.

     Higher interest rates also hurt the stocks of property insurance  companies
(including LandAmerica Financial and

* All fund returns referenced in this interview are for Investor Class shares.

[left margin]

"THE PORTFOLIO NOW HOLDS FEWER CORPORATE BONDS AND MORE MORTGAGE-BACKED
SECURITIES."

[pie charts - data below]

TYPES OF INVESTMENTS
IN THE PORTFOLIO

AS OF APRIL 30, 1999
Common Stocks                58%
Corporate Bonds              16%
Mortgage- & Asset-Backed
   Securities                13%
U.S. Treasury Securities      8%
Other                         5%

AS OF OCTOBER 31, 1998
Common Stocks                53%
Corporate Bonds              21%
U.S. Treasury Securities     10%
Mortgage- & Asset-Backed
   Securities                 9%
Other                         7%

Security types are defined on pages 26-27.


6      1-800-345-2021


Balanced--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

First  American  Financial)  and  construction  firms  (such as Centex  and D.R.
Horton).   Concerns  that  higher  rates  would  discourage  home  building  and
refinancing activity weighed down these stocks.

     Higher oil prices also hurt us. We were  underweight  in the energy  sector
because  falling oil prices in 1998 led to  repeatedly  disappointing  earnings.
Unfortunately,  that caused us to miss the upturn in 1999 when a sudden  rebound
in oil prices led to a sharp increase in energy stock prices in March and April.

BALANCED'S EQUITY PORTFOLIO DIDN'T KEEP PACE WITH THE SKYROCKETING S&P 500, BUT
IT DID PRODUCE A RESPECTABLE RETURN. WHAT THINGS WENT RIGHT?

     Balanced's  overweighting in computer  software stocks provided the biggest
performance boost.  Mega-sized  software  companies such as Microsoft  benefited
from both product sales growth and strong investor  demand for large-cap  growth
stocks.  Microsoft  was  Balanced's  largest  stock  holding  and one of its top
performers.

     Financial  services and banking  stocks--two of the fund's largest industry
positions--performed well amid improving earnings, which are tied closely to the
economy's  strength.  Chase  Manhattan and Morgan Stanley Dean Witter were among
Balanced's best performers for the period.

WHAT FACTORS AFFECTED THE PERFORMANCE OF THE FIXED-INCOME PORTFOLIO?

     Besides the  economic  strength and rising  interest  rates that caused low
bond returns,  the management team continued to gradually bring the fixed-income
portfolio  more in line with the Lehman  Brothers  Aggregate  Bond Index,  which
became the portfolio's  benchmark in the fourth quarter of 1998. As we discussed
in  Balanced's  last annual  report,  we switched  to the  Aggregate  Bond index
because we believe it better  represents  the broader  U.S.  taxable bond market
than the former benchmark (the Lehman Intermediate Government/Corporate Index).

     One  primary  difference  between  the two  indices  is that the  Aggregate
includes   mortgage-backed   securities,   while  the  Intermediate  Government/
Corporate does not. This is important because Balanced has owned mortgage-backed
securities in recent  years.  Also,  the  Aggregate has a smaller  percentage of
corporate bonds than we've typically held in Balanced.

     The portfolio now holds fewer  corporate  bonds--though  still more than in
the benchmark--and more mortgage-backed securities.

     Also,  since  September,  we have been  investing  a small  portion  of the
portfolio in corporate bonds rated BB. This is an area where we think we can add
value and boost fund performance.

CAN YOU ELABORATE ON THIS CHANGE?

     Bonds that are rated AAA, AA, A, or BBB are  considered  "investment-grade"
securities,  meaning  they are  relatively  safe from  default.  Many  funds and
institutions concentrate exclusively on investment-grade bonds.

     In contrast,  bonds rated B and below are more  vulnerable to sudden swings
in credit  quality.  As a result,  they offer high yields to compensate  for the
additional risk.  "High-yield"  investors focus on these bonds, as well as those
that are unrated.

[right margin]

TOP TEN STOCK HOLDINGS
                              % OF EQUITY PORTFOLIO
                             AS OF             AS OF
                            4/30/99          10/31/98
MICROSOFT CORP.              4.8%              4.4%
CHASE MANHATTAN
     CORP.                   3.8%               --
INTEL CORP.                  3.2%               --
FORD MOTOR CO.               2.7%               --
BELLSOUTH CORP.              2.6%               --
LINCOLN NATIONAL CORP.       2.5%               --
UNITED TECHNOLOGIES
     CORP.                   2.4%               --
MORGAN STANLEY
     DEAN WITTER,
     DISCOVER & CO.          2.2%               --
FANNIE MAE                   1.9%              4.2%
FIRST UNION CORP.            1.9%               --

TOP FIVE STOCK INDUSTRIES
                              % OF EQUITY PORTFOLIO
                             AS OF             AS OF
                            4/30/99          10/31/98
TELEPHONE
     COMMUNICATIONS          9.0%              5.4%*
COMPUTER SOFTWARE
     & SERVICES              8.7%              8.6%
BANKING                      8.5%              0.6%
PHARMACEUTICALS              7.0%             20.5%
INSURANCE                    6.5%             10.1%

* Percentage has been adjusted to reflect security industry reclassification.


                                                  www.americancentury.com      7


Balanced--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

     That leaves BB-rated bonds,  which are lower quality than  investment-grade
bonds but don't offer enough yield for  high-yield  investors.  This area of the
market is largely overlooked and often inefficiently priced.

WON'T THESE BB SECURITIES MAKE THE FUND'S BOND PORTFOLIO MORE RISKY?

     We believe we can manage the additional  risk in this sector  successfully.
First,  we have an experienced  credit  research team that is very familiar with
this part of the corporate bond market.

     Second,  we're taking a fairly  conservative  approach.  The BB bonds we're
buying  are issued by large,  established  companies  with  stable  cash  flows.
They're basically  "upgrade  candidates"--bonds  that are currently rated BB but
that we think are worthy of a higher rating.

     When a BB security is upgraded to a higher rating,  it often  experiences a
significant price increase because its newfound investment-grade status attracts
greater demand from investors.

WHAT'S YOUR OUTLOOK FOR THE U.S. ECONOMY AND THE MARKETS?

     We expect to see  continued  strong  economic  growth,  modest  but  higher
inflation, and less interest-rate volatility than we saw over the past year. The
strong  growth/modest  inflation  formula is a familiar  one that has pushed the
U.S.  stock  market  higher for the past four  years,  and this  could  continue
through 1999. We don't think the economic news will be as beneficial to bonds as
it's  been  to  stocks,   but  we  believe  bonds,   especially   corporate  and
mortgage-backed   securities,   should  perform  quite  well  if  interest  rate
volatility remains relatively low.

WHAT'S YOUR OUTLOOK FOR BALANCED?

     Balanced's  investment  portfolio  changed  significantly  in the  last six
months as we  switched  equity  management  styles  and  adjusted  to a new bond
benchmark. The next six months should be less eventful.

     On the  equity  side,  we've  found that our  quantitative  process is more
effective  at  picking  individual  stocks  than  industries.   So  rather  than
significantly  overweighting and underweighting entire sectors compared with the
S&P 500, we are bringing our industry  positions more in line with the index. We
plan to focus more on stock selection, over- and underweighting companies within
each sector.

CAN YOU GIVE AN EXAMPLE?

     We have recently  overweighted  financial services stocks compared with the
S&P 500. Going forward,  the percentage of financial  services  companies in the
fund will likely more closely track the percentage in the index.

     On the bond side,  we're  likely to  continue  to add more  mortgage-backed
securities and sell corporate bonds. One of the benefits of more mortgage-backed
holdings  is that the  credit  quality of the  portfolio  has  improved.  That's
because most  mortgage-backed  securities are backed by U.S. government agencies
with AAA ratings.

[left margin]

"THE BB BONDS WE'RE BUYING ARE BASICALLY 'UPGRADE CANDIDATES'--BONDS THAT ARE
CURRENTLY RATED BB BUT THAT WE THINK ARE WORTHY OF A HIGHER RATING."

BALANCED'S FIXED-INCOME PORTFOLIO
                                            AS OF            AS OF
                                           4/30/99         10/31/98
PORTFOLIO SENSITIVITY TO INTEREST RATES
   WEIGHTED AVERAGE MATURITY              8.0 YEARS        7.1 YEARS
   DURATION                               4.6 YEARS        4.5 YEARS

PORTFOLIO CREDIT QUALITY                 % OF FIXED-INCOME PORTFOLIO
   AAA                                      61%               46%
   AA                                        3%                5%
   A                                        18%               31%
   BBB                                      14%               13%
   BB                                        4%                5%
                                          -------           ------
                                            100%             100%
                                          =======           ======

Investment terms are defined in the Glossary on pages 26-27. Ratings provided by
Standard & Poor's. See Credit Rating Guidelines on page 25 for more information.


8      1-800-345-2021


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

Shares                            ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
COMMON STOCKS--58.2%
AEROSPACE & DEFENSE--2.9%
                  90,400   Cordant Technologies Inc.                $  4,170
                  38,000   EG&G, Inc.                                  1,188
                  42,600   General Dynamics Corp.                      2,993
                 140,200   Goodrich (B.F.) Company (The)               5,573
                   9,900   Gulfstream Aerospace Corp.(1)                 483
                  92,600   United Technologies Corp.                  13,415
                                                                  ------------
                                                                      27,822
                                                                  ------------
AIRLINES--0.1%
                   8,700   AMR Corp.(1)                                  607
                   4,400   Delta Air Lines Inc.                          279
                   2,400   US Airways Group Inc.(1)                      131
                                                                  ------------
                                                                       1,017
                                                                  ------------
AUTOMOBILES & AUTO PARTS--2.2%
                  38,830   DaimlerChrysler AG(1)                       3,813
                  30,900   Fleetwood Enterprises, Inc.                   763
                 233,200   Ford Motor Co.                             14,910
                  21,700   General Motors Corp.                        1,930
                                                                  ------------
                                                                      21,416
                                                                  ------------
BANKING--5.0%
                 148,100   Banc One Corp.                              8,738
                  78,300   BankAmerica Corp.                           5,638
                 258,000   Chase Manhattan Corp.                      21,350
                 191,600   First Union Corp.                          10,610
                   5,900   GreenPoint Financial Corp.                    207
                  25,500   Wells Fargo & Co.                           1,101
                                                                  ------------
                                                                      47,644
                                                                  ------------
BIOTECHNOLOGY--0.8%
                 121,200   Amgen Inc.(1)                               7,442
                                                                  ------------
BROADCASTING & MEDIA--0.3%
                  69,000   CBS Corporation(1)                          3,144
                                                                  ------------
BUILDING & HOME IMPROVEMENTS--0.4%
                  26,500   Centex Construction Products Inc.             937
                  75,100   Lafarge Corp.                               2,539
                   9,100   Lone Star Industries, Inc.                    325
                                                                  ------------
                                                                       3,801
                                                                  ------------
BUSINESS SERVICES & SUPPLIES(2)
                  22,000   Mastech Corp.(1)                              324
                                                                  ------------
CHEMICALS & RESINS--1.1%
                  43,600   Dow Chemical Co.                            5,720
                  62,100   du Pont (E.I.) de Nemours & Co.             4,386
                                                                  ------------
                                                                      10,106
                                                                  ------------
COMMUNICATIONS EQUIPMENT--1.5%
                  44,550   Comverse Technology, Inc.(1)                2,873

Shares                            ($ in Thousands)                    Value
- --------------------------------------------------------------------------------

                 145,200   Lucent Technologies Inc.                 $  8,730
                  44,200   Northern Telecom Ltd.                       3,014
                                                                  ------------
                                                                      14,617
                                                                  ------------
COMPUTER PERIPHERALS--0.8%
                  54,000   Cisco Systems Inc.(1)                       6,161
                   2,600   EMC Corp. (Mass.)(1)                          283
                  10,200   Lexmark International Group, Inc.
                              Cl A(1)                                  1,260
                                                                  ------------
                                                                       7,704
                                                                  ------------
COMPUTER SOFTWARE & SERVICES--5.1%
                  63,000   America Online Inc.                         8,993
                  74,200   Compuware Corp.(1)                          1,806
                   5,300   Concord EFS, Inc.(1)                          176
                  40,600   Keane, Inc.(1)                              1,007
                 327,100   Microsoft Corp.(1)                         26,587
                  57,600   NCR Corp.(1)                                2,362
                  30,100   Oracle Corp.(1)                               815
                  92,500   Sterling Software, Inc.(1)                  1,914
                 158,200   Unisys Corp.(1)                             4,973
                                                                  ------------
                                                                      48,633
                                                                  ------------
COMPUTER SYSTEMS--3.3%
                 222,800   Apple Computer, Inc.(1)                    10,242
                 114,700   Dell Computer Corp.(1)                      4,721
                  20,500   Gateway 2000, Inc.(1)                       1,357
                 117,100   Hewlett-Packard Co.                         9,236
                  28,200   International Business Machines
                              Corp.                                    5,899
                                                                  ------------
                                                                      31,455
                                                                  ------------
CONSTRUCTION & PROPERTY
DEVELOPMENT--0.8%
                  39,900   Centex Corp.                                1,459
                  85,300   D.R. Horton, Inc.                           1,647
                  33,400   Kaufman & Broad Home Corp.                    812
                  48,500   Owens Corning                               1,728
                  52,800   Pulte Corp.                                 1,195
                  16,100   Southdown, Inc.                             1,031
                                                                  ------------
                                                                       7,872
                                                                  ------------
CONSUMER PRODUCTS--0.3%
                   7,300   Procter & Gamble Co. (The)                    685
                  27,700   Whirlpool Corp.                             1,839
                                                                  ------------
                                                                       2,524
                                                                  ------------
DIVERSIFIED COMPANIES--1.5%
                  88,200   General Electric Co. (U.S.)                 9,305
                  35,500   Tyco International Ltd.                     2,884
                  36,700   Unilever N.V. New York Shares               2,383
                                                                  ------------
                                                                      14,572
                                                                  ------------
ELECTRICAL & ELECTRONIC
COMPONENTS--1.9%
                 288,000   Intel Corp.                                17,613

See Notes to Financial Statements


                                                  www.americancentury.com      9


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Shares                            ($ in Thousands)                    Value
- --------------------------------------------------------------------------------

                  13,900   Rockwell International Corp.             $    718
                                                                  ------------
                                                                      18,331
                                                                  ------------
ENERGY (PRODUCTION & MARKETING)--1.8%
                   3,100   Anadarko Petroleum Corp.                      118
                  41,400   Apache Corp.                                1,270
                  14,800   Burlington Resources Inc.                     682
                  52,000   Exxon Corp.                                 4,319
                  77,300   Mobil Corp.                                 8,097
                   2,100   Occidental Petroleum Corp.                     42
                  27,600   Sunoco, Inc.                                  987
                  19,000   Texaco Inc.                                 1,192
                  68,300   Union Pacific Resources                       956
                                                                  ------------
                                                                      17,663
                                                                  ------------
ENERGY (SERVICES)--0.4%
                  71,000   Reliant Energy, Inc.                        2,010
                  59,100   Tidewater Inc.                              1,566
                                                                  ------------
                                                                       3,576
                                                                  ------------
FINANCIAL SERVICES--3.8%
                  33,800   Equitable Companies Inc.                    2,275
                 151,300   Fannie Mae                                 10,733
                  75,200   Federal Home Loan Mortgage
                              Corporation                              4,719
                  38,400   Lehman Brothers Holdings Inc.               2,134
                  44,600   Merrill Lynch & Co., Inc.                   3,744
                 122,400   Morgan Stanley Dean Witter,
                              Discover & Co.                          12,141
                   4,300   Paine Webber Group, Inc.                      202
                                                                  ------------
                                                                      35,948
                                                                  ------------
FOOD & BEVERAGE--1.3%
                  55,100   ConAgra, Inc.                               1,371
                   9,200   Coors (Adolph) Co. Cl B                       492
                  45,600   Earthgrains Company                           966
                   4,700   General Mills, Inc.                           344
                  17,200   Hormel Foods Corp.                            632
                  26,800   IBP, Inc.                                     543
                 101,300   Quaker Oats Co. (The)                       6,540
                  35,800   Suiza Foods Corp.(1)                        1,345
                                                                  ------------
                                                                      12,233
                                                                  ------------
FURNITURE & FURNISHINGS(2)
                  24,100   Miller (Herman), Inc.                         481
                                                                  ------------
HEALTHCARE--0.3%
                  33,900   PacifiCare Health Systems, Inc.
                              Cl B(1)                                  2,705
                                                                  ------------
INDUSTRIAL EQUIPMENT & MACHINERY--0.6%
                  88,200   Ingersoll-Rand Co.                          6,102
                   4,200   McDermott International, Inc.                 122
                                                                  ------------
                                                                       6,224
                                                                  ------------

Shares                            ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
INSURANCE--3.8%
                 202,000   Allstate Corp.                           $  7,348
                  59,600   Conseco Inc.                                1,881
                 131,400   Fidelity National Financial, Inc.           2,398
                 126,000   First American Financial
                              Corp. (The)                              2,252
                  49,600   Gallagher (Arthur J.) & Co.                 2,356
                  61,200   LandAmerica Financial Group, Inc.           1,714
                 147,200   Lincoln National Corp.                     14,140
                  55,000   Loews Corp.                                 4,025
                                                                  ------------
                                                                      36,114
                                                                  ------------
LEISURE--1.4%
                  20,400   Anchor Gaming(1)                              969
                   7,600   Department 56, Inc.(1)                        206
                 100,300   Eastman Kodak Co.                           7,485
                  18,300   International Game Technology                 325
                 104,400   Viacom, Inc. Cl B(1)                        4,267
                                                                  ------------
                                                                      13,252
                                                                  ------------
MACHINERY & EQUIPMENT--0.4%
                 114,100   Premark International, Inc.                 4,200
                                                                  ------------
MEDICAL EQUIPMENT & SUPPLIES--0.8%
                  11,500   Andrx Corp.(1)                                907
                  64,900   Hillenbrand Industries, Inc.                3,046
                  18,500   Teleflex Inc.                                 806
                  24,400   VISX, Inc.(1)                               3,142
                                                                  ------------
                                                                       7,901
                                                                  ------------
METALS & MINING--0.1%
                  13,200   Aluminum Co. of America                       822
                                                                  ------------
PAPER & FOREST PRODUCTS(2)
                     200   Fort James Corp.                                8
                                                                  ------------
PHARMACEUTICALS--4.1%
                  77,400   Bristol-Myers Squibb Co.                    4,920
                  94,800   Genentech, Inc.(1)                          8,022
                  33,500   Herbalife International, Inc. Cl A            343
                  38,700   Johnson & Johnson                           3,773
                  40,900   Lilly (Eli) & Co.                           3,011
                  14,400   McKesson Corp.                                504
                  30,300   Medicis Pharmaceutical Corp.
                              Cl A(1)                                    737
                  19,500   Merck & Co., Inc.                           1,370
                  26,700   Nature's Sunshine Products, Inc.              286
                  13,800   Pfizer, Inc.                                1,588
                  11,900   Roberts Pharmaceutical Corp.(1)               202
                 183,600   Schering-Plough Corp.                       8,870
                  76,900   Warner-Lambert Co.                          5,224
                                                                  ------------
                                                                      38,850
                                                                  ------------
PRINTING & PUBLISHING--0.7%
                 198,000   Deluxe Corp.                                6,856
                                                                  ------------

                                              See Notes to Financial Statements


10      1-800-345-2021


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Shares                            ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
RETAIL (FOOD & DRUG)--0.2%
                  60,800   Universal Corp.                          $  1,547
                                                                  ------------
RETAIL (GENERAL MERCHANDISE)--1.2%
                  27,700   Neiman-Marcus Group, Inc.(1)                  667
                 230,000   Wal-Mart Stores, Inc.                      10,580
                                                                  ------------
                                                                      11,247
                                                                  ------------
RETAIL (INTERNET)--0.1%
                   7,400   Amazon.com, Inc.(1)                         1,273
                                                                  ------------
RETAIL (SPECIALTY)--0.4%
                  34,400   Home Depot, Inc.                            2,062
                  45,300   Zale Corp.(1)                               1,713
                                                                  ------------
                                                                       3,775
                                                                  ------------
RUBBER & PLASTICS(2)
                   9,600   Tupperware Corp.                              227
                                                                  ------------
STEEL(2)
                   2,100   Nucor Corp.                                   123
                                                                  ------------
TELEPHONE COMMUNICATIONS--5.2%
                  80,600   Ameritech Corp.                             5,516
                 201,600   AT&T Corp.                                 10,181
                  32,700   Bell Atlantic Corp.                         1,884
                 325,600   BellSouth Corp.(3)                         14,571
                  75,800   GTE Corp.                                   5,074
                 147,100   SBC Communications Inc.                     8,238
                   1,600   Sprint Corp.                                  164
                  83,200   U S WEST Communications
                              Group                                    4,352
                                                                  ------------
                                                                      49,980
                                                                  ------------
TEXTILES & APPAREL--0.6%
                  53,000   Dexter Corp. (The)                          2,176
                  19,800   Tommy Hilfiger Corp.(1)                     1,384
                  35,900   VF Corp.                                    1,849
                                                                  ------------
                                                                       5,409
                                                                  ------------
TOBACCO--0.4%
                  16,300   Fortune Brands, Inc.                          644
                  79,900   Philip Morris Companies Inc.                2,801
                                                                  ------------
                                                                       3,445
                                                                  ------------
TRANSPORTATION--0.3%
                  46,700   Hertz Corp. Cl A                            2,787
                                                                  ------------
UTILITIES--2.1%
                   9,800   BEC Energy                                    417
                  30,500   Central & South West Corp.                    757
                  22,700   Energy East Corp.                             600
                  58,300   FPL Group, Inc.                             3,287
                  59,300   KN Energy, Inc.                             1,223
                  88,100   LG&E Energy Corp.                           1,922
                 106,400   Minnesota Power & Light Co.                 2,241

Shares/Principal Amount           ($ in Thousands)                    Value
- --------------------------------------------------------------------------------

                  31,700   Northeast Utilities(1)                   $    507
                 118,800   Sempra Energy                               2,465
                 168,200   Southern Co.                                4,548
                  22,500   Texas Utilities Co.                           894
                  69,000   Utilicorp United Inc.                       1,686
                                                                  ------------
                                                                      20,547
                                                                  ------------
WIRELESS COMMUNICATIONS--0.2%
                  12,000   AirTouch Communications, Inc.(1)            1,121
                  17,600   Sprint PCS(1)                                 746
                                                                  ------------
                                                                       1,867
                                                                  ------------
TOTAL COMMON STOCKS                                                  557,484
                                                                  ------------
   (Cost $469,745)

U.S. TREASURY SECURITIES--7.4%
                $  5,000   U.S. Treasury Notes, 5.50%,
                              3/31/00                                  5,029
                  15,000   U.S. Treasury Notes, 5.125%,
                              8/31/00                                 15,021
                   4,075   U.S. Treasury Notes, 7.75%,
                              2/15/01                                  4,259
                   2,460   U.S. Treasury Notes, 6.625%,
                              7/31/01                                  2,538
                   7,150   U.S. Treasury Notes, 6.25%,
                              8/31/02                                  7,365
                   4,000   U.S. Treasury Notes, 4.75%,
                              2/15/04                                  3,921
                   2,500   U.S. Treasury Bonds, 12.00%,
                              8/15/08                                  3,632
                   4,000   U.S. Treasury Bonds, 9.125%,
                              5/15/18                                  5,452
                   8,250   U.S. Treasury Bonds, 8.875%,
                              2/15/19                                 11,057
                   2,000   U.S. Treasury Bonds, 7.50%,
                              11/15/24                                 2,416
                   4,200   U.S. Treasury Bonds, 6.50%,
                              11/15/26                                 4,541
                   5,000   U.S. Treasury Bonds, 6.375%,
                              8/16/27                                  5,339
                                                                  ------------
TOTAL U.S. TREASURY SECURITIES                                        70,570
                                                                  ------------
   (Cost $71,094)

U.S. GOVERNMENT AGENCY SECURITIES--2.3%
                   5,000   FHLB, 5.50%, 8/13/01                        5,015
                   3,750   FNMA MTN, 5.83%, 2/2/04                     3,707
                   4,000   FNMA MTN, 5.54%, 2/5/04                     3,921
                   4,000   FNMA MTN, 5.74%, 1/21/09                    3,805
                   3,000   FNMA, 5.25%, 1/15/09                        2,862
                   3,000   FNMA, 6.50%, 4/29/09                        2,998
                                                                  ------------
TOTAL U.S. GOVERNMENT
AGENCY SECURITIES                                                     22,308
                                                                  ------------
   (Cost $22,748)

See Notes to Financial Statements


                                                 www.americancentury.com      11


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
MORTGAGE-BACKED SECURITIES(4)--8.3%
                $  4,429   FHLMC Pool #C00578, 6.50%,
                              1/1/28                                $  4,414
                   2,000   FHLMC Series 77-HPAC REMIC,
                              8.50%, 9/15/20                           2,107
                       6   FHLMC Series 106-EPAC
                              REMIC, 6.95%, 12/15/20                       6
                   5,246   FNMA Pool #050985, 6.00%,
                              3/1/00                                   5,233
                     537   FNMA Pool #347879, 6.50%,
                              5/1/11                                     542
                   4,164   FNMA Pool #313481, 7.00%,
                              4/1/12                                   4,264
                      95   FNMA Pool #398955, 6.50%,
                              10/1/12                                     96
                     359   FNMA Pool #251700, 6.50%,
                              5/1/13                                     363
                     156   FNMA Pool #429525, 6.50%,
                              5/1/13                                     158
                     416   FNMA Pool #421163, 6.50%,
                              6/1/13                                     420
                     593   FNMA Pool #421173, 6.50%,
                              6/1/13                                     599
                     530   FNMA Pool #421501, 6.50%,
                              6/1/13                                     536
                     361   FNMA Pool #429306, 6.50%,
                              6/1/13                                     365
                     194   FNMA Pool #433184, 6.50%,
                              6/1/13                                     196
                   5,000   FNMA Pool #412562, 6.50%,
                              1/1/28                                   4,979
                   3,417   FNMA Pool #413812, 6.50%,
                              1/1/28                                   3,403
                   5,673   FNMA Pool #411821, 7.00%,
                              1/1/28                                   5,764
                   3,944   FNMA Pool #440691, 6.50%,
                              11/1/28                                  3,927
                   3,916   FNMA Pool #450619, 6.00%,
                              12/1/28                                  3,804
                   1,990   FNMA Pool #453956, 6.00%,
                              12/1/28                                  1,933
                   3,323   FNMA Pool #454947, 6.00%,
                              12/1/28                                  3,228
                   2,976   FNMA Pool #252211, 6.00%,
                              1/1/29                                   2,891
                   2,993   FNMA Pool #252212, 6.50%,
                              1/1/29                                   2,980
                   4,727   FNMA Pool #485403, 6.00%,
                              2/1/29                                   4,591
                   3,819   FNMA Pool #485438, 6.50%,
                              2/1/29                                   3,802
                   5,298   GNMA Pool #002202, 7.00%,
                        `     4/20/26                                  5,364
                   3,432   GNMA Pool #780412, 7.50%,
                              8/15/26                                  3,545

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------

                $  2,594   GNMA Pool #467626, 7.00%,
                              2/15/28                               $  2,638
                   2,628   GNMA Pool #458862, 7.50%,
                              2/15/28                                  2,714
                   4,346   GNMA Pool #469811, 7.00%,
                              12/15/28                                 4,420
                                                                  ------------
TOTAL MORTGAGE-BACKED SECURITIES                                      79,282
                                                                  ------------
   (Cost $79,163)

ASSET-BACKED SECURITIES(4)--4.6%
                   2,800      CIT RV Trust, Series 1998 A, Class A4 SEQ, 6.09%,
                              2/15/12                                  2,821
                   4,184   First Merchants Auto Receivables
                              Corp., Series 1996 B, Class A2,
                              6.80%, 5/15/01                           4,223
                   5,719   First Union-Lehman Brothers
                              Commercial Mortgage,
                              Series 1998 C2, Class A1 SEQ,
                              6.28%, 6/18/07                           5,742
                   3,750   FNMA Whole Loan,
                              Series 1995 W1, Class A6,
                              8.10%, 4/25/25                           3,840
                   6,500   GMAC Commercial Mortgage
                              Securities Inc., Series 1999 C1,
                              Class A2 SEQ, 6.18%,
                              5/15/33                                  6,376
                   3,000   Money Store (The) Home Equity
                              Trust, Series 1997 C,
                              Class AF6 SEQ, 6.67%,
                              2/15/25                                  3,036
                   1,458   Morgan Stanley Capital I,
                              Series 1998 HF2,
                              Class A1 SEQ, 6.01%,
                              11/15/30                                 1,448
                   4,250   PECO Energy Transition Trust,
                              Series 1999 A, Class A6 SEQ,
                              6.05%, 3/1/09                            4,229
                   3,000   Union Acceptance Corp.,
                              Series 1996 D, Class A3,
                              6.30%, 1/8/04                            3,036
                   4,350   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1996 D1, Class A4,
                              6.78%, 2/15/16                           4,394
                   2,100   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1996 D1, Class A5,
                              6.92%, 10/15/18                          2,138
                   3,200   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1997 C, Class A7,
                              6.85%, 1/15/29                           3,257
                                                                  ------------
TOTAL ASSET-BACKED SECURITIES                                         44,540
                                                                  ------------
   (Cost $44,453)

                                              See Notes to Financial Statements


12      1-800-345-2021


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
CORPORATE BONDS--15.9%
BANKING--0.9%
                $  2,000   Fleet National Bank, 5.75%,
                              1/15/09                               $  1,900
                   5,000   NationsBank Corporation, 6.875%,
                              2/15/05                                  5,188
                   2,000   U.S. Bank NA, 5.70%, 12/15/08               1,900
                                                                  ------------
                                                                       8,988
                                                                  ------------
BROADCASTING & MEDIA--0.6%
                   3,750   British Sky Broadcasting, 6.875%,
                              2/23/09                                  3,743
                   2,250   CSC Holdings Inc., 7.625%,
                              7/15/18                                  2,264
                                                                  ------------
                                                                       6,007
                                                                  ------------
CHEMICALS & RESINS--0.3%
                   3,000   Monsanto Co., 6.60%, 12/1/28
                              (Acquired  12/4/98,
                              Cost $2,989)(5)                          2,862
                                                                  ------------
DIVERSIFIED COMPANIES--0.2%
                   2,000   Hutchison Whampoa Financial,
                              7.50%, 8/1/27 (Acquired
                              4/7/99, Cost $1,737)(5)                  1,800
                                                                  ------------
ELECTRICAL & ELECTRONIC
COMPONENTS--0.7%
                   6,000   Anixter International Inc., 8.00%,
                              9/15/03                                  6,176
                                                                  ------------
ENERGY (PRODUCTION & MARKETING)--0.5%
                   2,000   K N Energy, Inc., 6.45%,
                              11/30/01                                 2,025
                   3,000   USX Corp., 6.85%, 3/1/08                    2,992
                                                                  ------------
                                                                       5,017
                                                                  ------------
ENERGY (SERVICES)--0.2%
                   2,000   Petroleum Geo-Services ASA,
                              7.125%, 3/30/28                          1,905
                                                                  ------------
FINANCIAL SERVICES--2.3%
                   3,500   Associates Corp., N.A., 6.375%,
                              10/15/02                                 3,554
                   3,000   Citigroup Inc., 5.80%, 3/15/04              2,980
                   4,000   Comdisco, Inc., 6.375%,
                              11/30/01                                 4,027
                   3,500   Ford Motor Credit Co., 6.125%,
                              4/28/03                                  3,510
                   2,700   Ford Motor Credit Co., 6.75%,
                              5/15/05                                  2,774
                   3,000   Money Store Inc. (The), 8.05%,
                              4/15/02                                  3,158
                   2,000   Toyota Motor Credit Corp.,
                              5.625%, 11/13/03                         1,979
                                                                  ------------
                                                                      21,982
                                                                  ------------

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------

FOOD & BEVERAGE--0.4%
                $  4,000   Pepsico, Inc., 5.625%, 2/17/09
                              (Acquired 2/3/99, Cost
                              $3,983)(5)                            $  3,819
                                                                  ------------
HEALTHCARE--0.5%
                   5,000   Aetna Services, Inc., 6.75%,
                              8/15/01                                  5,077
                                                                  ------------
INSURANCE--1.7%
                   3,400   Conseco Financing Trust II, 8.70%,
                              11/15/26                                 3,189
                   3,600   Conseco Inc., 6.40%, 6/15/01                3,556
                   3,750   Nationwide Mutual Insurance Co.,
                              6.50%, 2/15/04 (Acquired
                              2/9/96, Cost $3,782)(5)                  3,779
                   5,000   Underwriters Reinsurance Co.,
                              7.875%, 6/30/06 (Acquired
                              8/6/96, Cost $5,156)(5)                  5,285
                                                                  ------------
                                                                      15,809
                                                                  ------------
METALS & MINING--0.4%
                   3,500   Barrick Gold Corp., 7.50%,
                              5/1/07                                   3,686
                                                                  ------------
PACKAGING & CONTAINERS--0.3%
                   3,300   Owens-Illinois Inc., 7.15%,
                              5/15/05                                  3,267
                                                                  ------------
PAPER & FOREST PRODUCTS--0.4%
                   4,100   Abitibi-Consolidated Inc., 7.40%,
                              4/1/18                                   3,966
                                                                  ------------
REAL ESTATE--1.9%
                   2,400   Chelsea GCA Realty Partners,
                              7.25%, 10/21/07                          2,242
                   6,800   Price REIT, Inc. (The), 7.25%,
                              11/1/00                                  6,908
                   3,800   Price REIT, Inc. (The), 7.125%,
                              6/15/04                                  3,887
                   5,000   Spieker Properties, Inc., 6.80%,
                              12/15/01                                 5,053
                                                                  ------------
                                                                      18,090
                                                                  ------------
RETAIL (APPAREL)--0.2%
                   2,000   Saks Inc., 8.25%, 11/15/08                  2,166
                                                                  ------------
RETAIL (FOOD & DRUG)--0.2%
                   2,000   Rite Aid Corp., 6.125%,
                              12/15/08 (Acquired 1/6/99,
                              Cost $2,013)(5)                          1,886
                                                                  ------------
RETAIL (GENERAL MERCHANDISE)--0.4%
                   4,000   Sears, Roebuck & Co. MTN,
                              7.12%, 6/4/04                            4,154
                                                                  ------------
STEEL--0.3%
                   2,500   Pohang Iron & Steel Co., Ltd.,
                              6.625%, 7/1/03                           2,405
                                                                  ------------

See Notes to Financial Statements


                                                 www.americancentury.com      13


Balanced--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
TELEPHONE COMMUNICATIONS--1.9%
                $  6,600   Cable & Wireless Communications
                              plc, 6.625%, 3/6/05                   $  6,655
                   1,000   GTE North Inc., Series H, 5.65%,
                              11/15/08                                   956
                   3,000   GTE South, 7.25%, 8/1/02                    3,117
                   2,250   MCI WorldCom, Inc., 6.95%,
                              8/15/28                                  2,227
                   1,750   Qwest Communications
                              International Inc., 7.50%,
                              11/1/08 (Acquired 10/28/98,
                              Cost $1,738)(5)                          1,838
                   3,000   Sprint Capital Corp., 6.875%,
                              11/15/28                                 2,910
                                                                  ------------
                                                                      17,703
                                                                  ------------
UTILITIES--0.9%
                   2,600   Empresa Nacional de Electricidad
                              S.A. (Chile), 8.50%, 4/1/09
                              (Acquired 4/21/99, Cost
                              $2,803)(5)                               2,798
                   2,000   Texas Utilities Electric Co.,
                              8.125%, 2/1/02                           2,110
                   4,200   Yorkshire Power Finance, Series B,
                              6.15%, 2/25/03 (Acquired
                              2/19/98, Cost $4,200)(5)                 4,185
                                                                  ------------
                                                                       9,093
                                                                  ------------
WIRELESS COMMUNICATIONS--0.7%
                   6,040   AirTouch Communications, Inc.,
                              7.125%, 7/15/01                          6,199
                                                                  ------------
TOTAL CORPORATE BONDS                                                152,057
                                                                  ------------
   (Cost $151,095)

Principal Amount                  ($ in Thousands)                    Value
- --------------------------------------------------------------------------------
FORWARD COMMITMENTS--0.4%
                $  3,500   FNMA, 6.50%, settlement
                              5/20/99                               $  3,534
                                                                  ------------
   (Cost $3,538)

TEMPORARY CASH INVESTMENTS--2.9%
   Repurchase Agreement, Morgan Stanley
    Group, Inc., (U.S. Treasury obligations), in a
    joint trading account at 4.84%, dated
    4/30/99, due 5/3/99 (Delivery value
    $27,511)                                                          27,500
                                                                  ------------
   (Cost $27,500)

TOTAL INVESTMENT SECURITIES--100.0%                                 $957,275
                                                                  ============
   (Cost $869,336)

FUTURES CONTRACTS
                                  ($ in Thousands)
                                             Underlying
                        Expiration           Face Amount        Unrealized
     Purchased             Date               at Value             Gain
- -------------------------------------------------------------------------------

    47 S&P 500             June
      Futures              1999               $15,704              $801
                                         =======================================

NOTES TO SCHEDULE OF INVESTMENTS

FHLB = Federal Home Loan Bank

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

GNMA = Government National Mortgage Association

MTN = Medium Term Note

(1)  Non-income producing.

(2) Industry is less than 0.05% of total investment securities.

(3)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for Forward Commitments.

(4)  Final maturity indicated.  Expected remaining maturity used for purposes of
     calculating the weighted average portfolio maturity.

(5)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value of  restricted  securities  at April 30, 1999 was $28,252,
     which represented 2.9% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the share amount (stocks) or principal amount (bonds) of each investment

* the market value of each investment

* the percentage of investments in each industry, as applicable

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


14      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

ASSETS                                   (In Thousands Except Per Share Amounts)
Investment securities, at value
  (identified cost of $869,336) (Note 3) ..................         $    957,275
Receivable for investments sold ...........................                  988
Receivable for variation margin
  on futures contracts ....................................                  646
Dividends and interest receivable .........................                5,593
                                                                    ------------
                                                                         964,502
                                                                    ------------

LIABILITIES
Disbursements in excess
  of demand deposit cash ..................................                   89
Payable for investments purchased .........................                3,617
Accrued management fees (Note 2) ..........................                  787
Distribution fees payable (Note 2) ........................                    2
Service fees payable (Note 2) .............................                    2
Payable for directors' fees and expenses ..................                    1
                                                                    ------------
                                                                           4,498
                                                                    ------------
Net Assets ................................................         $    960,004
                                                                    ============

NET ASSETS CONSIST OF:
Capital (par value and paid in surplus) ...................         $    750,310
Undistributed net investment income .......................                2,319
Accumulated undistributed net
  realized gain on investments ............................              118,634
Net unrealized appreciation on
  investments (Note 3) ....................................               88,741
                                                                    ------------
                                                                    $    960,004
                                                                    ============

Investor Class, $0.01 Par Value
($ and shares in full)
Net assets ................................................         $951,121,028
Shares outstanding ........................................           50,650,756
Net asset value per share .................................         $      18.78

Advisor Class, $0.01 Par Value
($ and shares in full)
Net assets ................................................         $  8,882,582
Shares outstanding ........................................              473,177
Net asset value per share .................................         $      18.77

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns,  you get the fund's net assets.  For each class of shares,  the net assets
divided  by the total  number of  shares  outstanding  gives you the price of an
individual share, or the net asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment  income not yet paid to  shareholders or net investment  losses;  net
gains earned on investments  but not yet paid to  shareholders  or net losses on
investments (known as realized gains or losses); and finally, gains or losses on
securities  still  owned  by the  fund  (known  as  unrealized  appreciation  or
depreciation).  This  breakdown  tells  you the  value  of net  assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      15


Statement of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED)

INVESTMENT INCOME                                                (In Thousands)
Income:
Interest ..................................................           $  12,520
Dividends .................................................               3,982
                                                                      ---------
                                                                         16,502
                                                                      ---------
Expenses (Note 2):
Management fees ...........................................               4,787
Distribution fees -- Advisor Class ........................                  10
Service fees -- Advisor Class .............................                  10
Directors' fees and expenses ..............................                   5
                                                                      ---------
                                                                          4,812
                                                                      ---------
Net investment income .....................................              11,690
                                                                      ---------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
(NOTE 3)
Net realized gain on investments ..........................             124,868
Change in net unrealized
  appreciation on investments .............................             (47,511)
                                                                      ---------

Net realized and unrealized
  gain on investments .....................................              77,357
                                                                      ---------

Net Increase in Net Assets
  Resulting from Operations ...............................           $  89,047
                                                                      =========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* income earned from investments (dividend and interest)

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


16      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED) AND YEAR ENDED OCTOBER 31, 1998

Increase in Net Assets                                      1999           1998

OPERATIONS                                                   (In Thousands)
Net investment income ............................     $  11,690      $  20,669
Net realized gain on investments .................       124,868        101,331
Change in net unrealized
  appreciation on investments ....................       (47,511)       (26,549)
                                                       ---------      ---------
Net increase in net assets
   resulting from operations .....................        89,047         95,451
                                                       ---------      ---------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income:
  Investor Class .................................       (11,974)       (20,729)
  Advisor Class ..................................           (87)          (125)
From net realized gains from
 investment transactions:
  Investor Class .................................      (102,260)       (75,512)
  Advisor Class ..................................          (747)          (492)
                                                       ---------      ---------
Decrease in net assets from distributions ........      (115,068)       (96,858)
                                                       ---------      ---------

CAPITAL SHARE TRANSACTIONS
(NOTE 4)
Net increase in net assets from
  capital share transactions .....................        41,161         14,410
                                                       ---------      ---------
Net increase in net assets .......................        15,140         13,003

NET ASSETS
Beginning of period ..............................       944,864        931,861
                                                       ---------      ---------
End of period ....................................     $ 960,004      $ 944,864
                                                       =========      =========
Undistributed net investment income ..............     $   2,319      $   2,690
                                                       =========      =========

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* share transactions--shareholders' purchases, reinvestments, and redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      17


Notes to Financial Statements
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION -- American  Century Mutual Funds,  Inc. (the  corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management  investment company.  Balanced Fund (the fund) is one of the thirteen
series of funds issued by the corporation. The fund's investment objective is to
seek capital  growth and current  income.  The fund is authorized to issue three
classes of shares:  the Investor Class, the Advisor Class, and the Institutional
Class.  The three  classes  of shares  differ  principally  in their  respective
shareholder servicing and distribution expenses and arrangements.  All shares of
the fund  represent  an equal pro rata  interest  in the  assets of the class to
which such shares belong, and have identical voting,  dividend,  liquidation and
other  rights  and the same  terms and  conditions,  except  for class  specific
expenses  and  exclusive  rights to vote on matters  affecting  only  individual
classes.  The following  significant  accounting policies are in accordance with
generally accepted accounting  principles;  these principles may require the use
of estimates by fund management.

     SECURITY VALUATIONS -- Portfolio securities traded primarily on a principal
securities  exchange are valued at the last reported sales price, or the mean of
the  latest  bid and  asked  prices  where no last  sales  price  is  available.
Securities traded  over-the-counter are valued at the mean of the latest bid and
asked prices or, in the case of certain foreign securities, at the last reported
sales price,  depending on local  convention or regulation.  Debt securities not
traded on a  principal  securities  exchange  are  valued  through a  commercial
pricing  service or at the mean of the most  recent bid and asked  prices.  When
valuations  are not readily  available,  securities  are valued at fair value as
determined in accordance with procedures adopted by the Board of Directors.

     SECURITY  TRANSACTIONS -- Security transactions are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME -- Dividend  income less foreign taxes withheld (if any)
is  recorded  as of the  ex-dividend  date.  Interest  income is recorded on the
accrual basis and includes accretion of discounts and amortization of premiums.

     FUTURES  CONTRACTS -- The fund may enter into stock index futures contracts
in order to manage the fund's exposure to changes in market  conditions.  One of
the risks of entering into futures  contracts  includes the possibility that the
change in value of the contract may not  correlate  with the changes in value of
the underlying  securities.  Upon entering into a futures contract,  the fund is
required to deposit  either cash or  securities  in an amount equal to a certain
percentage  of  the  contract  value  (initial  margin).   Subsequent   payments
(variation  margin)  are made or  received  daily,  in cash,  by the  fund.  The
variation  margin is equal to the  daily  change  in the  contract  value and is
recorded as unrealized gains and losses.  The fund recognizes a realized gain or
loss when the contract is closed or expires.  Net realized and unrealized  gains
or losses  occurring  during  the  holding  period of  futures  contracts  are a
component of realized gain (loss) on  investments  and  unrealized  appreciation
(depreciation) on investments, respectively.

     REPURCHASE AGREEMENTS -- The fund may enter into repurchase agreements with
institutions  the  fund's  investment   manager,   American  Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost. The fund requires that collateral,  represented by securities, received in
a repurchase  transaction be transferred to the custodian in a manner sufficient
to enable the fund to obtain those  securities  in the event of a default  under
the  repurchase  agreement.  ACIM  monitors,  on a daily basis,  the  securities
transferred to ensure the value,  including accrued interest,  of the securities
under each repurchase  agreement is equal to or greater than amounts owed to the
fund under each repurchase agreement.

     JOINT  TRADING  ACCOUNT -- Pursuant  to an  Exemptive  Order  issued by the
Securities  and  Exchange  Commission,  the fund,  along with  other  registered
investment  companies  having  management  agreements  with ACIM,  may  transfer
uninvested  cash  balances  into a joint  trading  account.  These  balances are
invested in one or more repurchase agreements that are collateralized by U.S.
Treasury or Agency obligations.

     INCOME  TAX  STATUS  -- It is the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  gains to  shareholders  and to  otherwise
qualify as a regulated  investment  company  under  provisions  of the  Internal
Revenue  Code.  Accordingly,  no  provision  has been made for  federal or state
income taxes.

     DISTRIBUTIONS TO SHAREHOLDERS -- Distributions to shareholders are recorded
on the ex-dividend date.  Distributions  from net investment income are declared
and paid quarterly.  Distributions from net realized gains are declared and paid
annually.


18      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

APRIL 30, 1999 (UNAUDITED)

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of  certain  income  items and net  realized  gains  and  losses  for  financial
statement  and tax purposes  and may result in  reclassification  among  certain
capital accounts.

     ADDITIONAL   INFORMATION   --  Funds   Distributor,   Inc.   (FDI)  is  the
corporation's  distributor.  Certain  officers  of FDI are also  officers of the
corporation.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The  corporation  has entered  into a Management  Agreement  with ACIM that
provides the fund with investment  advisory and management  services in exchange
for a single,  unified management fee per class. The Agreement provides that all
expenses of the fund, except brokerage commissions, taxes, interest, expenses of
those  directors who are not considered  "interested  persons" as defined in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses, will be paid by ACIM. The fee is computed daily and paid monthly based
on the fund's class average daily closing net assets during the previous  month.
The  annual  management  fee is 1.00% for the  Investor  Class and 0.75% for the
Advisor Class.

     The Board of Directors  has adopted the Advisor  Class Master  Distribution
and  Shareholder  Services  Plan  (the  plan),  pursuant  to Rule  12b-1  of the
Investment Company Act of 1940. The plan provides that the fund will pay ACIM an
annual  distribution  fee equal to 0.25% and annual  service fee equal to 0.25%.
The fees are  computed  daily  and paid  monthly  based on the  Advisor  Class's
average daily closing net assets during the previous month. The distribution fee
provides   compensation   for  distribution   expenses   incurred  by  financial
intermediaries  in  connection  with  distributing  shares of the Advisor  Class
including,  but not limited to,  payments to  brokers,  dealers,  and  financial
institutions  that have entered into sales  agreements with respect to shares of
the  fund.  The  service  fee  provides   compensation   for   shareholder   and
administrative  services  rendered by ACIM, its affiliates or independent  third
party providers.  Fees incurred by the fund under the plan during the six months
ended April 30, 1999 were $19,429.

      Certain officers and directors of the corporation are also officers and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the corporation's  investment manager, ACIM, and
the corporation's transfer agent, American Century Services Corporation.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

     Purchases of investment securities,  excluding short-term investments,  for
the six months ended April 30, 1999 totaled $800,576,711,  of which $150,319,414
represented  U.S.   Treasury  and  Agency   obligations.   Sales  of  investment
securities,  excluding short-term  investments,  totaled $817,155,238,  of which
$102,528,024 represented U.S. Treasury and Agency obligations.

     As  of  April  30,  1999,  accumulated  net  unrealized   appreciation  was
$85,143,942,  based on the aggregate  cost of investments  of  $872,131,400  for
federal  income tax  purposes,  which  consisted of unrealized  appreciation  of
$108,675,490 and unrealized depreciation of $23,531,548.


                                                 www.americancentury.com      19


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

APRIL 30, 1999 (UNAUDITED)

4. CAPITAL SHARE TRANSACTIONS

    Transactions in shares of the fund were as follows:

                                                SHARES          AMOUNT
INVESTOR CLASS                                      (In Thousands)

Shares authorized ...........................   134,000
                                              ===========
Six months ended April 30, 1999
Sold ........................................    5,905        $111,104
Issued in reinvestment of distributions .....    6,208         111,552
Redeemed ....................................   (9,847)       (183,812)
                                              -----------    -----------
Net increase ................................     2,266        $38,844
                                              ===========    ===========

Year ended October 31, 1998
Sold ........................................    9,532        $184,305
Issued in reinvestment of distributions .....    5,211         94,198
Redeemed ....................................   (13,720)      (265,088)
                                              -----------    -----------
Net increase ................................    1,023         $13,415
                                              ===========    ===========

ADVISOR CLASS

Shares authorized ...........................    50,000
                                              ===========
Six months ended April 30, 1999
Sold ........................................      125         $2,330
Issued in reinvestment of distributions .....      46            820
Redeemed ....................................     (45)          (833)
                                              -----------    -----------
Net increase ................................      126         $2,317
                                              ===========    ===========

Year ended October 31, 1998
Sold ........................................      79          $1,523
Issued in reinvestment of distributions .....      34            616
Redeemed ....................................     (59)         (1,144)
                                              -----------    -----------
Net increase ................................      54           $995
                                              ===========    ===========


20   1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

APRIL 30, 1999 (UNAUDITED)

- --------------------------------------------------------------------------------
5. BANK LOANS

    Effective  December  18,  1998,  the fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus  0.40%.  The fund may borrow  money for
temporary or emergency  purposes to fund shareholder  redemptions.  The fund did
not borrow from the line during the period  December 18, 1998 through  April 30,
1999.

- --------------------------------------------------------------------------------
6. FUND EVENTS

    The following name change became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

  FUND:    Balanced Fund                 American Century Balanced Fund


                                                 www.americancentury.com      21


Balanced--Financial Highlights
- --------------------------------------------------------------------------------
<TABLE>

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                                            Investor Class
                                           1999(1)         1998          1997          1996          1995          1994
PER-SHARE DATA
<S>                                        <C>            <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of Period ...   $ 19.39        $ 19.55       $ 18.55       $ 17.70       $ 15.94       $ 16.52
                                           -------        -------       -------       -------       -------       -------
Income From Investment Operations
  Net Investment Income ................      0.23(2)        0.42(2)       0.40(2)       0.44(2)       0.48(2)       0.42
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ....      1.52           1.45          2.41          1.88          2.03         (0.58)
                                           -------        -------       -------       -------       -------       -------
  Total From Investment Operations .....      1.75           1.87          2.81          2.32          2.51         (0.16)
                                           -------        -------       -------       -------       -------       -------
Distributions
  From Net Investment Income ...........     (0.24)         (0.43)        (0.43)        (0.46)        (0.48)        (0.42)
  From Net Realized Gains on
  Investment Transactions ..............     (2.12)         (1.60)        (1.38)        (1.01)        (0.27)         --
                                           -------        -------       -------       -------       -------       -------
  Total Distributions ..................     (2.36)         (2.03)        (1.81)        (1.47)        (0.75)        (0.42)
                                           -------        -------       -------       -------       -------       -------
Net Asset Value, End of Period .........   $ 18.78        $ 19.39       $ 19.55       $ 18.55       $ 17.70       $ 15.94
                                           =======        =======       =======       =======       =======       =======
  Total Return(3) ......................      9.64%         10.46%        16.34%        14.04%        16.36%        (0.93)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..................      1.00%(4)       1.00%         1.00%         0.99%         0.98%         1.00%
Ratio of Net Investment Income
to Average Net Assets ..................      2.48%(4)       2.16%         2.15%         2.50%         2.90%         2.70%
Portfolio Turnover Rate ................        87%           102%          110%          130%           85%           94%
Net Assets, End of Period
(in millions) ..........................   $   951        $   938       $   926       $   879       $   816       $   704
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


22      1-800-345-2021


Balanced--Financial Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                       Advisor Class
                                         1999(1)           1998         1997(2)
PER-SHARE DATA
<S>                                    <C>              <C>           <C>
Net Asset Value, Beginning of Period ..$   19.38        $   19.55     $   17.46
                                       ---------        ---------     ---------
Income From Investment Operations
  Net Investment Income(3) ............     0.20             0.37          0.29
  Net Realized and Unrealized
  Gain on Investment Transactions .....     1.53             1.44          2.04
                                       ---------        ---------     ---------
  Total From Investment Operations ....     1.73             1.81          2.33
                                       ---------        ---------     ---------
Distributions
  From Net Investment Income ..........    (0.22)           (0.38)        (0.24)
  From Net Realized Gains on
  Investment Transactions .............    (2.12)           (1.60)         --
                                       ---------        ---------     ---------
  Total Distributions .................    (2.34)           (1.98)        (0.24)
                                       ---------        ---------     ---------
Net Asset Value, End of Period ........$   18.77        $   19.38     $   19.55
                                       =========        =========     =========
  Total Return(4) .....................     9.50%           10.15%        13.42%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets .................     1.25%(5)         1.25%         1.25%(5)
Ratio of Net Investment Income
to  Average Net Assets ................     2.23%(5)         1.91%         1.90%(5)
Portfolio Turnover Rate ...............       87%             102%          110%
Net Assets, End of Period
(in thousands) ........................$   8,883        $   6,723     $   5,724
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) January 6, 1997 (commencement of sale) through October 31, 1997.

(3) Computed using average shares outstanding throughout the period.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


                                                 www.americancentury.com      23


Share Class and Retirement Account Information
- --------------------------------------------------------------------------------

SHARE CLASSES

     Two classes of shares are authorized for sale by the fund: Investor Class
and Advisor Class.

      INVESTOR CLASS  shareholders  do not pay any commissions or other fees for
purchase  of fund shares  directly  from  American  Century.  Investors  who buy
Investor  Class  shares  through  a  broker-dealer  may be  required  to pay the
broker-dealer a transaction fee.

     ADVISOR  CLASS shares are sold  through  banks,  broker-dealers,  insurance
companies,  and financial advisors.  Advisor Class shares are subject to a 0.50%
Rule 12b-1  service and  distribution  fee. Half of that fee is available to pay
for recordkeeping and administrative  services, and half is available to pay for
distribution  services provided by the financial  intermediary through which the
Advisor Class shares are purchased. The total expense ratio of the Advisor Class
is 0.25% higher than the total expense ratio of the Investor Class.

     Both  classes  of  shares  represent  a pro rata  interest  in the fund and
generally have the same rights and preferences.

RETIREMENT ACCOUNT INFORMATION

     As required by law, any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax withheld.  Your written notice is valid from the date of
receipt  at  American  Century.  Even if you plan to  rollover  the  amount  you
withdraw to another tax-deferred  account, the withholding rate still applies to
the withdrawn  amount  unless we have received a written  notice not to withhold
federal income tax prior to the withdrawal.

     When you plan to withdraw,  you may make your  election by  completing  our
Exchange/Redemption  form or an IRS Form W-4P. Call American  Century for either
form.  Your  written  election  is valid from the date of  receipt  at  American
Century. You may revoke your election at any time by sending a written notice to
us.

     Remember, even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


24      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century  offers 14 growth and  income  funds  including  domestic
equity, balanced, asset allocation, and specialty funds.

     AMERICAN CENTURY BALANCED seeks capital growth and current income. The fund
keeps about 60% of its assets in a diversified portfolio of common stocks. Under
normal  market   conditions,   the  remaining   assets  are  held  in  Treasury,
mortgage-backed, and corporate bonds.

     We attempt  to keep the fund fully  invested  at all times,  regardless  of
short-term market activity.  Experience has shown that market gains can occur in
unpredictable  spurts  and that  missing  even some of those  opportunities  may
significantly limit the potential for gain.

     For the  equity  portfolio,  the goal is to  achieve  a total  return  that
exceeds that of the S&P 500. The portfolio is managed using  computer  models as
key tools in making investment decisions.  One model ranks stocks based on their
expected  return,  using  both  growth  and value  measures  such as cash  flow,
earnings growth,  and  price/earnings  ratio.  Another model creates a portfolio
that balances  high-ranking stocks with an overall risk level that is comparable
to the S&P 500.

     The  fixed-income  portfolio  is also  index  based.  The  management  team
attempts  to add  value by  making  modest  portfolio  adjustments  based on its
analysis of prevailing market  conditions.  The team typically seeks to slightly
overweight relatively undervalued, higher-yielding sectors of the market.

COMPARATIVE INDICES

     The  indices  listed  below  are used in the  report  for fund  performance
comparisons. They are not investment products available for purchase.

     The BLENDED INDEX is considered the benchmark for Balanced. It combines two
widely known indices in  proportion  to the asset mix of the fund.  Accordingly,
60% of the index is represented by the S&P 500, which reflects the approximately
60% of the fund's assets invested in equity securities. The remaining 40% of the
index is represented by the Lehman Brothers Aggregate Bond Index, which reflects
the roughly 40% of the fund's assets invested in fixed-income securities.

     The LEHMAN BROTHERS AGGREGATE BOND INDEX is composed of the Lehman Brothers
Government/Corporate  Index and the Lehman Brothers  Mortgage-Backed  Securities
Index.  It  reflects  the  price  fluctuations  of  Treasury  securities,   U.S.
government agency securities, corporate bond issues, and mortgage-backed
securities.

     The  S&P  500  is a  capitalization-weighted  index  of the  stocks  of 500
publicly  traded  U.S.  companies  that are  considered  to be leading  firms in
dominant  industries.  Created by  Standard & Poor's  Corporation,  the index is
viewed as a broad measure of U.S. stock market performance.

[right margin]

INVESTMENT TEAM LEADERS
  EQUITY PORTFOLIO
     JOHN SCHNIEDWIND
     JEFF TYLER
  FIXED-INCOME PORTFOLIO
     BUD HOOPS
     JEFF HOUSTON
  CREDIT RESEARCH
     GREG AFIESH

CREDIT RATING GUIDELINES

     CREDIT  RATINGS  ARE  ISSUED  BY  INDEPENDENT  RESEARCH  COMPANIES  SUCH AS
STANDARD & POOR'S AND MOODY'S.  THEY ARE BASED ON AN ISSUER'S FINANCIAL STRENGTH
AND ABILITY TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

     SECURITIES RATED AAA, AA, A, OR BBB ARE CONSIDERED "INVESTMENT-GRADE"
SECURITIES, MEANING THEY ARE RELATIVELY SAFE FROM DEFAULT. HERE ARE THE MOST
COMMON CREDIT RATINGS AND THEIR DEFINITIONS:

*    AAA -- EXTREMELY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*    AA -- VERY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*    A -- STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*    BBB -- GOOD ABILITY TO MEET FINANCIAL OBLIGATIONS.

*    BB  --  SECURITIES   THAT  ARE  LESS   VULNERABLE  TO  DEFAULT  THAN  OTHER
     LOWER-QUALITY ISSUES BUT DO NOT QUITE MEET INVESTMENT-GRADE STANDARDS.

     IT'S IMPORTANT TO NOTE THAT CREDIT RATINGS ARE  SUBJECTIVE,  REFLECTING THE
OPINIONS OF THE RATING AGENCIES; THEY ARE NOT ABSOLUTE STANDARDS OF QUALITY.


                                                 www.americancentury.com      25


Glossary
- --------------------------------------------------------------------------------

FIXED-INCOME TERMS

* ASSET-BACKED  SECURITIES -- debt securities that represent ownership in a pool
of receivables, such as credit-card debt, auto loans, and commercial mortgages.

* CORPORATE  BONDS -- debt  securities  or  instruments  issued by companies and
corporations.

* DURATION  is a measure  of the  sensitivity  of a  fixed-income  portfolio  to
interest  rate  changes.  It is a  time-weighted  average  of the  interest  and
principal  payments  of the  securities  in a  portfolio.  As the  duration of a
portfolio  increases,  the impact of a change in interest  rates on the value of
the portfolio also increases.

*  MORTGAGE-BACKED  SECURITIES -- debt  securities  that represent  ownership in
pools of mortgage loans.

* U.S.  TREASURY  SECURITIES -- debt securities  issued by the U.S. Treasury and
backed by the direct "full faith and credit" pledge of the U.S. government.

* WEIGHTED AVERAGE MATURITY (WAM) is another measurement of the sensitivity of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio  mature,  weighted by dollar  amount.  The
longer the WAM, the more interest  rate  exposure and interest rate  sensitivity
the portfolio has.

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations in a fund's return;  they are not the same as  year-by-year  results.
For  fiscal   year-by-year  total  returns,   please  refer  to  the  "Financial
Highlights" on pages 22-23.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate  of the  fund's  rate of  investment  income,  and it may not equal the
fund's  actual  income  distribution  rate,  the income paid to a  shareholder's
account, or the income reported in the fund's financial statements.

EQUITY TERMS

*  BLUE-CHIP  STOCKS  --  generally  considered  to be the  stocks  of the  most
established  companies in American  industry.  They are generally large,  fairly
stable  companies that have  demonstrated  consistent  earnings and usually have
long-term growth potential.

* CYCLICAL STOCKS -- generally  considered to be stocks whose price and earnings
fluctuations tend to follow the ups and downs of the business cycle.

* GROWTH STOCKS -- generally  considered to be the stocks of companies that have
experienced  above-average  earnings  growth and appear  likely to continue such
growth.

* VALUE  STOCKS  --  generally  considered  to be  stocks  that  are  relatively
inexpensive.

* LARGE-CAPITALIZATION  ("LARGE-CAP") STOCKS -- these tend to be the stocks that
make up the Dow Jones Industrial Average and the S&P 500.


26      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

*  MEDIUM-CAPITALIZATION  ("MID-CAP") STOCKS -- these tend to be the stocks that
make up the S&P MidCap 400.

*  SMALL-CAPITALIZATION  (SMALL-CAP)  STOCKS -- these tend to be the stocks that
make up the S&P SmallCap 600.

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

* CAPITAL  PRESERVATION  -- Offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- Offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME -- Offers funds that emphasize both growth and income.

* GROWTH -- Offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that the fund's category may change over time. Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its objectives,  policies, and risk potential are consistent
with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


                                                 www.americancentury.com      27


Notes
- --------------------------------------------------------------------------------


28      1-800-345-2021

[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[back cover]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 OR 816-444-3485

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUTUAL FUNDS, INC.

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9906                                                    Funds Distributor, Inc.
SH-BKT-16757                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                 APRIL 30, 1999

SEMIANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- -----------------------
LIMITED-TERM BOND
INTERMEDIATE-TERM BOND
BOND

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century


[inside front cover]

AMERICAN CENTURY KEEPS WITH TRADITION
- --------------------------------------------------------------------------------

FOLLOWING BENHAM'S FOOTSTEPS

On March 1, we made it easier for you to do business with us. We simplified  our
organizational  structure by  eliminating  the  venerable  Benham and  Twentieth
Century names, and putting all our funds under American Century. The name change
will not affect your funds' investment  management--the proven Benham investment
philosophy, experienced portfolio management teams, and legacy of innovation and
high-quality performance remain.

CONSISTENT,  SOLID  PERFORMANCE--We'll  continue  to  adhere  to the  investment
practices  that have  helped  our  fixed-income  funds  perform so well over the
years. In 1998,  two-thirds of American Century bond funds beat their peer group
average, according to Lipper, Inc.

CONSISTENT  INVESTMENT  PHILOSOPHY--American  Century  fixed-income  funds  will
continue to offer a "pure play" on their sector of the market, as they did under
Benham.

CONTINUITY  OF THE  MANAGEMENT  TEAM--The  investment  process  is not all  that
remains  the same;  we've  retained  our core team of  experienced  fixed-income
portfolio managers.

    *  Experience--The  more than 35 fixed-income  investment  professionals  at
       American  Century have an average of nine years of investment  management
       experience.

    *  Bigger and better--Since  American Century was formed,  we've doubled the
       size  of the  original  Benham  management  team  in our  Mountain  View,
       California office.

TRADITION OF INNOVATION--Like  Benham before it, American Century is a leader in
fixed-income  fund  innovation.  For example,  we introduced a total of four new
fixed-income  funds  in the  last  three  years,  including  the  first  no-load
inflation-adjusted bond fund.

We continue to run our fixed-income operation from our offices in Mountain View,
California, which is also home to our walk-in Investor Center.

We look forward to continuing to meet your fixed-income  investment needs in the
Benham tradition.

WHAT'S NEW . . .

     We now classify our funds in easy-to-remember categories based on objective
and risk. The four  objective  categories  are:  CAPITAL  PRESERVATION,  INCOME,
GROWTH AND INCOME,  and GROWTH.  The three risk  categories  are:  CONSERVATIVE,
MODERATE,  and AGGRESSIVE.  This new  classification  system makes it easier for
investors to identify which funds are right for them.

     Turn to the  inside  back  cover of this  report to see a list of the funds
classified by objective and risk. For  definitions of the fund  categories,  see
the Glossary.

Past performance is no guarantee of future results.

[left margin]

LIMITED-TERM BOND
(ABLIX)
- ------------------------------

INTERMEDIATE-TERM BOND
(TWITX)
- ------------------------------

BOND
(TWLBX)
- ------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     During the six months  ended April 30,  1999,  we  witnessed  a  remarkable
reversal  in the U.S.  bond  market.  When we last  addressed  you in the annual
report for the  American  Century  diversified  bond  funds--Limited-Term  Bond,
Intermediate-Term Bond, and Bond--yields had just plunged as investors rushed to
the relative safety and liquidity of U.S.  Treasury  securities.  Investors were
spooked by global  economic and financial  turmoil,  which motivated the Federal
Reserve (the U.S. central bank) to cut short-term  interest rates to bolster the
U.S. economy and help stabilize markets worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was showing  strong growth,  and
investor confidence had rebounded.  Investors moved out of Treasurys into stocks
and higher-yielding  bonds.  Interest rates rose, limiting bond fund performance
in 1999. In this  challenging  environment,  our investment  team worked hard to
find  higher-yielding,  relatively  undervalued sectors of the market that could
help produce positive returns.

     We also continued to focus on making American Century easier to do business
with  and  helping   investors  reach  their  financial   goals.  In  March,  we
consolidated all our funds under the American Century name.  Though we are proud
of the venerable Twentieth Century and Benham names, we believe the change makes
it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we've  enhanced  our Web site (at  www.americancentury.com).
Among the new  features are daily fund  information--including  return and price
data--market  and  national  news,  and  a  Forms  Center  with  access  to  the
most-requested investor forms and applications.  You can also sign up to receive
fund prospectuses and shareholder reports electronically.

     Finally,  to help  you  better  understand  your  fund,  we sent  you a new
simplified  prospectus  in March.  It  provides  information  you need in clear,
straightforward language.

     We want your  experience  with  American  Century to be  rewarding,  and we
appreciate your continued confidence in us.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer

[right margin]

                 Table of Contents
   Report Highlights ......................................................    2
   Market Perspective .....................................................    3
LIMITED-TERM BOND
   Performance Information ................................................    4
   Management Q&A .........................................................    5
   Schedule of Investments ................................................    8
INTERMEDIATE-TERM BOND
   Performance Information ................................................   10
   Management Q&A .........................................................   11
   Schedule of Investments ................................................   14
BOND
   Performance Information ................................................   17
   Management Q&A .........................................................   18
   Schedule of Investments ................................................   21
FINANCIAL STATEMENTS
   Statements of Assets and
      Liabilities .........................................................   24
   Statements of Operations ...............................................   25
   Statements of Changes
      in Net Assets .......................................................   26
   Notes to Financial
      Statements ..........................................................   27
   Financial Highlights ...................................................   31
OTHER INFORMATION
   Share Class and Retirement
      Account Information .................................................   37
   Background Information
      Investment Philosophy
         and Policies .....................................................   38
      Comparative Indices .................................................   38
      Lipper Rankings .....................................................   38
      Investment Team
         Leaders ..........................................................   38
      Credit Rating
         Guidelines .......................................................   38
   Glossary ...............................................................   39


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   Interest  rates rose during the six months  ended April 30,  1999,  limiting
    bond  returns.  For the period,  the Lehman  Brothers  Aggregate  Bond Index
    returned just 0.69%.

*   Treasury bond yields hit record lows in late 1998 as investors sought a safe
    haven from financial crises in Asia, Russia, and Latin America.

*   Interest rates rose in early 1999 because the global  economic and financial
    situation stabilized, while the U.S. economy grew vigorously.

*   Corporate and  mortgage-backed  securities  outperformed  Treasurys in early
    1999 when  investors  began to sell Treasury  bonds and buy  higher-yielding
    securities.

LIMITED-TERM BOND

*   Limited-Term  Bond had  positive  returns  for the six  months  despite  the
    increase in interest rates.

*   The  portfolio  essentially  matched  the  average  return of the 110 "Short
    Investment-Grade  Debt  Funds"  tracked by Lipper  Inc.  for the six months.
    Limited-Term  Bond's longer-term returns rank in the top third of the Lipper
    group.

*   We used a value-oriented approach to asset allocation, reducing our Treasury
    position  and adding  more  higher-yielding  corporate  and  mortgage-backed
    securities in late 1998.

*   Those adjustments paid off in the first quarter of 1999, when Treasurys were
    the worst-performing domestic bond sector, while higher-yielding  securities
    performed relatively well.

INTERMEDIATE-TERM BOND

*   Intermediate-Term  Bond performed well relative to the average "Intermediate
    Investment-Grade Debt Fund" tracked by Lipper Inc.

*   The portfolio's yield rose significantly, in part because of our decision to
    add more corporate and mortgage-backed securities in late 1998.

*   Those changes helped  performance in 1999, when  higher-yielding  securities
    outperformed Treasurys.

*   We recently  began adding BB securities in an attempt to better  utilize our
    experienced  corporate  credit research team while giving the portfolio more
    yield and return potential.

BOND

*   The portfolio's  return reflected the difficult  investment  environment for
    longer-term bonds over the last six months.

*   Though Bond  lagged its Lipper  group,  the  portfolio  had a  significantly
    better-than-average yield as of April 30.

*   This  increase  in yield  is a  result  of our  value-oriented  approach  to
    managing  the  fund--we  reduced  our  Treasury   position  and  added  more
    higher-yielding corporate securities.

*   We recently  began adding BB securities in an attempt to better  utilize our
    experienced  corporate  credit research team while giving the portfolio more
    yield and return potential.

*   We think our relatively  large  position in  attractively  valued  corporate
    bonds should boost performance going forward.

[left margin]

              LIMITED-TERM BOND(1)
                   (ABLIX)
TOTAL RETURNS:                 AS OF 4/30/99
    6 Months                        1.72%(2)
    1 Year                             5.62%
30-DAY SEC YIELD:                      5.17%
INCEPTION DATE:                       3/1/94
NET ASSETS:                 $20.3 million(3)

            INTERMEDIATE-TERM BOND(1)
                   (TWITX)
TOTAL RETURNS:                 AS OF 4/30/99
    6 Months                        0.87%(2)
    1 Year                             5.61%
30-DAY SEC YIELD:                      5.58%
INCEPTION DATE:                       3/1/94
NET ASSETS:                 $33.6 million(3)

                   BOND(1)
                   (TWLBX)
TOTAL RETURNS:                 AS OF 4/30/99
    6 Months                        0.08%(2)
    1 Year                             3.87%
30-DAY SEC YIELD:                      5.84%
INCEPTION DATE:                       3/2/87
NET ASSETS:                $140.6 million(3)

(1)  Investor Class.
(2)  Not annualized.
(3)  Includes Investor and Advisor Classes.

See Total  Returns on pages 4, 10, and 17.  Investment  terms are defined in the
Glossary on pages 39-40.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, chief investment officer of fixed income

RISING RATES EAT INTO PERFORMANCE

     Interest  rates rose and bond prices fell in the six months ended April 30,
1999,  after a period of abnormal  interest rate  volatility.  For the six-month
period,  the Lehman  Brothers  Aggregate  Bond  Index--a  broad  measure of bond
performance--returned just 0.69%.

INTEREST RATE VOLATILITY

     In 1998,  global capital  markets were rocked by financial  crises in Asia,
Russia, and Latin America. These developments,  and the near-collapse of several
highly  leveraged  hedge funds,  sent  investors  scrambling  for the safety and
liquidity of the U.S.  Treasury  market.  In addition,  the Federal Reserve (the
U.S.  central bank) lowered  interest  rates three times in late 1998 to prop up
the economy and restore  investor  confidence.  These  factors  combined to send
Treasury bond yields to record lows in October 1998.

REBOUND SPARKS HIGHER INTEREST RATES

     The Fed's rate cuts and positive  economic news helped calm investor fears.
Hedge funds stabilized, and Asian economies showed signs that they had reached a
bottom and were starting to improve.  Latin American  economies didn't fall into
the  desperate  straits  that  many had  feared,  while  the U.S.  economy  grew
vigorously--the  economy  expanded at a 6% annual rate in the fourth  quarter of
1998 and a 4.1% annual rate in the first quarter of 1999.

     Further, energy prices increased, causing an uptick in inflation. Inflation
fears and greater global economic and financial  stability  caused a reversal in
the bond  market,  with bond yields  rising  significantly  (see the yield curve
graph at right). Bond yields and prices move in opposite  directions,  so rising
yields meant that bonds  generally  suffered  price declines for the six months,
with longer-term bonds hardest hit.

CORPORATE AND MORTGAGE-BACKED SECURITIES OUTPERFORM TREASURYS

     As  yields  rose,  Treasury  securities  gave  back  some of  their  gains,
producing  flat to  negative  returns.  On the other  hand,  continued  economic
strength  helped  re-invigorate  the corporate bond market.  The Fed's rate cuts
eased credit and lowered corporate borrowing costs, which helped corporate bonds
outperform Treasurys for the six months.

     The mortgage-backed  securities market was hit hard by lower interest rates
in the third quarter of 1998, when mortgage  refinancings reached a record high.
Refinancings shorten the life of mortgage-backed  securities and leave investors
excess cash to reinvest in lower-yielding  securities. But prepayments slowed as
rates rose after  October,  while the  attractive  yields  offered by  mortgages
relative to Treasury bonds drew some buyers. Those factors have helped mortgages
outperform Treasurys so far in 1999.

[right margin]

"INFLATION FEARS AND GREATER GLOBAL ECONOMIC AND FINANCIAL STABILITY CAUSED A
REVERSAL IN  THE BOND MARKET, WITH BOND YIELDS RISING SIGNIFICANTLY SINCE
OCTOBER."

BOND INDEX RETURNS
FOR THE SIX MONTHS ENDED APRIL 30, 1999
   LEHMAN CORPORATE
      BOND INDEX                1.75%
   LEHMAN MORTGAGE-BACKED
      SECURITIES INDEX          2.39%
   LEHMAN TREASURY
      BOND INDEX               -1.21%

Source: Russell/Mellon Analytical

[mountain graph - data below]

TREASURY YIELD CURVE

                 10/31/98              4/30/99
YEARS TO
MATURITY
1                 4.38%                 4.96%
2                 4.26%                 5.09%
3                 4.34%                 5.18%
4                 4.38%                 5.28%
5                 4.32%                 5.22%
6                 4.39%                 5.32%
7                 4.46%                 5.42%
8                 4.49%                 5.39%
9                 4.52%                 5.36%
10                4.54%                 5.32%
11                4.65%                 5.41%
12                4.76%                 5.50%
13                4.89%                 5.59%
14                4.99%                 5.68%
15                5.08%                 5.77%
16                5.12%                 5.80%
17                5.17%                 5.83%
18                5.21%                 5.86%
19                5.26%                 5.89%
20                5.30%                 5.93%
21                5.32%                 5.93%
22                5.34%                 5.92%
23                5.35%                 5.92%
24                5.37%                 5.91%
25                5.38%                 5.90%
26                5.33%                 5.86%
27                5.28%                 5.82%
28                5.23%                 5.78%
29                5.18%                 5.74%
30                5.14%                 5.71%

Source: Bloomberg Financial Markets


                                                  www.americancentury.com      3



Limited-Term Bond--Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF APRIL 30, 1999

                                      INVESTOR CLASS (INCEPTION 3/1/94)                         ADVISOR CLASS (INCEPTION 11/12/97)
                     LIMITED-TERM  MERRILL LYNCH 1-5 YR.  SHORT INVESTMENT-GRADE DEBT FUNDS(2)  LIMITED-TERM  MERRILL LYNCH 1-5 YR.
                        BOND        GOVT./CORP. INDEX       AVERAGE RETURN   FUND'S RANKING         BOND        GOVT./CORP. INDEX
<S>                      <C>             <C>              <C>                    <C>             <C>              <C>
6 MONTHS(1)             1.72%            0.98%                  1.76%             --                1.60%            0.98%
1 YEAR                  5.62%            6.33%                  5.05%        27 OUT OF 110          5.36%            6.33%
===============================================================================================================================
AVERAGE ANNUAL RETURNS
===============================================================================================================================
3 YEARS                 6.05%            6.81%                  5.87%        31 OUT OF 85            --               --
5 YEARS                 5.99%            6.80%                  5.85%        19 OUT OF 60            --               --
LIFE OF FUND            5.57%            6.26%                  5.67%(3)     19 OUT OF 60(3)        5.35%           6.47%(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since  3/31/94,  the date nearest the class's  inception  for which data are
    available.

(4) Since  11/30/97,  the date nearest the class's  inception for which data are
    available.

See  pages  37-39  for  more  information  about  share  classes,  returns,  the
comparative index, and Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 4/30/99
Merrill Lynch 1- to 5-Year
   Govt./Corp. Index           $14,011
Limited-Term Bond              $13,227

                      Limited-Term     Merrill Lynch 1- to 5-Year
                          Bond            Govt./Corp. Index
DATE                     VALUE                   VALUE
3/1/94                  $10,000                 $10,000
3/31/94                  $9,933                  $9,909
6/30/94                  $9,906                  $9,885
9/30/94                  $9,989                  $9,974
12/31/94                 $9,979                  $9,961
3/31/95                 $10,291                 $10,348
6/30/95                 $10,620                 $10,764
9/30/95                 $10,794                 $10,928
12/31/95                $11,072                 $11,253
3/31/96                 $11,094                 $11,243
6/30/96                 $11,193                 $11,336
9/30/96                 $11,364                 $11,529
12/31/96                $11,560                 $11,772
3/31/97                 $11,638                 $11,817
6/30/97                 $11,886                 $12,111
9/30/97                 $12,115                 $12,386
12/31/97                $12,300                 $12,614
3/31/98                 $12,463                 $12,809
6/30/98                 $12,650                 $13,023
9/30/98                 $13,019                 $13,509
12/31/98                $13,075                 $13,583
3/31/99                 $13,180                 $13,639
4/30/99                 $13,227                 $14,011

$10,000 investment made 3/1/94

The graph at left shows the growth of a $10,000  investment over the life of the
fund,  while the graph  below  shows the fund's  year-by-year  performance.  The
Merrill  Lynch  1-  to  5-Year  Government/  Corporate  Index  is  provided  for
comparison in each graph.  Limited-Term  Bond's total returns include  operating
expenses (such as transaction  costs and management  fees) that reduce  returns,
while the total returns of the index do not.  These graphs are based on Investor
Class shares only; performance for other classes will vary due to differences in
fee  structures  (see Total  Returns  table above).  Past  performance  does not
guarantee future results.  Investment return and principal value will fluctuate,
and redemption value may be more or less than original cost.

[bar graph - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDED APRIL 30)

                     Limited-Term     Merrill Lynch 1- to 5-Year
                        Bond             Govt./Corp. Index
DATE                   RETURN                 RETURN
4/30/94*               -1.12%                 -1.49%
4/30/95                 5.11%                  6.12%
4/30/96                 6.69%                  7.43%
4/30/97                 5.78%                  6.23%
4/30/98                 6.76%                  7.88%
4/30/99                 5.62%                  6.33%

* From the fund's 3/1/94 inception date to 4/30/94.


4      1-800-345-2021


Limited-Term Bond--Q&A
- --------------------------------------------------------------------------------
/photo of John Walsh/

     An interview with John Walsh, a portfolio  manager on the Limited-Term Bond
fund investment  team. John became lead manager on Limited-Term  Bond in January
1999, replacing Jeff Houston, who assumed greater management  responsibility for
three other bond funds.  John has been a credit analyst or portfolio  manager on
the American Century diversified bond funds team since 1996.

HOW DID THE FUND PERFORM DURING THE SIX MONTHS ENDED APRIL 30, 1999?

     Limited-Term Bond's returns were positive, despite the increase in interest
rates in recent  months (see page 3 for a more  complete  discussion of interest
rates and the investment climate over the last six months).  For the six months,
the fund returned  1.72%.* That's about in line with the 1.76% average return of
the  110  "Short  Investment-Grade  Debt  Funds"  tracked  by  Lipper  Inc.  The
portfolio's   longer-term   performance  remains  quite  good--for  life-of-fund
performance,  Limited-Term Bond ranks in the top third of its Lipper group. (See
the previous page for additional performance comparisons.)

WHAT ARE SOME OF THE  BIGGEST  FACTORS  BEHIND THE  PORTFOLIO'S  PERFORMANCE  IN
RECENT MONTHS?

     Duration and asset allocation go a long way toward explaining  Limited-Term
Bond's performance. Duration measures a portfolio's sensitivity to interest rate
changes.  The longer the  duration,  the more a fund's  share price will rise or
fall when rates change. We manage duration conservatively,  typically keeping it
in a  relatively  narrow  band  around two years or so. But we believe  that's a
little longer than the duration of many of the funds in the Lipper  group.  That
slightly  longer duration gave a modest boost to performance in 1998, when rates
declined.  But when  rates rose over the last six  months,  our  position  was a
little bit of a drag on returns relative to the Lipper group.

WHAT CHANGES DID YOU MAKE TO THE PORTFOLIO'S ASSET ALLOCATION?

     The  biggest   change  was  to  reduce  our   Treasury   position  and  add
higher-yielding  bonds.  (See the  charts  on page  6.) It made  sense to hold a
significant  stake in Treasurys  in 1998,  when global  economic  and  financial
turmoil sent rates  tumbling and investors  looking for the safety and liquidity
of the Treasury  market.  But big gains by Treasurys  meant other sectors of the
bond market,  such as corporate and mortgage-backed  securities,  offered higher
yields and better  relative  values by late 1998.  As a result,  we reduced  the
fund's exposure to Treasury securities from about a third of investments at the

* All fund returns referenced in this interview are for Investor Class shares.

[right margin]

"FOR LIFE-OF-FUND PERFORMANCE, LIMITED-TERM BOND RANKS IN THE TOP THIRD OF ITS
LIPPER GROUP."

PORTFOLIO AT A GLANCE
                             4/30/99           10/31/98
NUMBER OF SECURITIES           49                54
WEIGHTED AVERAGE
  MATURITY                   2.3 YRS           2.4 YRS
AVERAGE DURATION             1.9 YRS           2.1 YRS
EXPENSE RATIO (FOR
  INVESTOR CLASS)             0.70%*            0.70%

* Annualized.

YIELD AS OF APRIL 30, 1999
                             INVESTOR          ADVISOR
                              CLASS             CLASS
30-DAY SEC YIELD              5.17%             4.92%

Investment terms are defined in the Glossary on pages 39-40.


                                                  www.americancentury.com      5


Limited-Term Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

end of October to less than 15% by the end of April, while increasing the amount
of corporate and mortgage-backed bonds.

HOW DID THE TRADE OUT OF TREASURYS AND INTO HIGHER-YIELDING SECURITIES WORK OUT

     We think  that  change  paid off in early  1999,  when  Treasurys  were the
worst-performing sector of the U.S. bond market.  Corporates and mortgage-backed
securities, on the other hand, performed relatively well. The Fed's rate cuts in
late 1998  brightened the picture for  corporations  because lower rates reduced
borrowing  costs.  In addition,  U.S.  economic  growth surged  despite  turmoil
overseas.  Those  factors  gave  investors  renewed  confidence  that  corporate
earnings would stay strong.

CAN YOU TALK A LITTLE BIT ABOUT THE PORTFOLIO'S MORTGAGE-BACKED SECURITIES?

     Sure.  Like  corporate  bonds,   mortgage-backed   securities  looked  very
attractive relative to Treasurys in late 1998. Last year was rough for investors
in  mortgage-backed  securities  because  falling  interest rates sent home-loan
refinancings to a record high in October.  Mortgage refinancings are undesirable
for  investors  because they return all your money to you during a market rally,
leaving you to reinvest that cash at lower yields.

     But  higher  rates  since   October  have  slowed   refinancing   activity.
Unfortunately,  higher  rates also cause the  duration of  mortgages  to extend,
which hurts performance when rates rise sharply.  Mortgages tend to perform best
when  rates are  relatively  stable.  Because we think  rates  will  remain in a
relatively  narrow  range or rise  only  slightly,  it  makes  sense to own some
mortgage-backed securities.

ANY CHANGES TO THE PORTFOLIO'S  CREDIT QUALITY?

     Limited-Term  Bond's average credit quality remains  relatively high, about
midway  between AA and A,  despite  the fact that we hold fewer AAA and more BBB
bonds than we did six  months  ago.  (See the chart on page 7 for more  detailed
credit rating information.)

     We're  holding more BBB  securities  as a result of our efforts to find the
best  relative  values in the  market.  When fears of  recession  and an extreme
aversion  to risk  crippled  financial  markets  in the third  quarter  of 1998,
lower-rated bonds fell sharply. We think those price declines were overdone, and
we were able to buy BBB bonds with very  attractive  yields and prices.  Indeed,
healthier financial markets and strong economic growth meant BBB bonds performed
relatively well in the first quarter.

AS OF SEPTEMBER 1, 1998, LIMITED-TERM BOND IS ALLOWED TO INVEST IN SECURITIES
RATED BB. HAVE YOU BEEN VERY ACTIVE IN THAT AREA?

     Not yet--BB bonds  accounted for less than 5% of  investments at the end of
April.  This  reflects  a  relative  lack of BB  paper at the  short  end of the
corporate bond market. Much of the issuance in short-term  corporate bonds is by
finance  companies,  which  tend  to  have  "investment-grade"  credit  ratings.
Investment-grade  paper is rated AAA, AA, A, or BBB and is considered relatively
safe from default.

[left margin]

"CORPORATE AND MORTGAGE-BACKED SECURITIES OFFERED HIGHER YIELDS AND BETTER
RELATIVE VALUES THAN TREASURYS BY LATE 1998."

[pie charts - data below]

PORTFOLIO COMPOSITION BY
SECURITY TYPE

AS OF APRIL 30, 1999
Corporate Bonds         54%
Asset-Backed            14%
U.S. Treasury           13%
Mortgage-Backed         13%
Other                    6%

AS OF OCTOBER 31, 1998
Corporate Bonds         46%
U.S. Treasury           29%
Asset-Backed            16%
Mortgage-Backed          9%

Security types are defined on pages 39-40.


6      1-800-345-2021


Limited-Term Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

     The change in investment  policy is likely to have a greater  effect on the
intermediate-  and longer-term  American  Century  diversified bond funds simply
because  there's  more BB paper in their  segment  of the  market.  But we would
consider  adding more BB  securities  if we thought they would help boost yields
and returns.

DOES INVESTING IN THESE BB SECURITIES MAKE THE PORTFOLIO MORE RISKY?

     We think the slight potential increase in risk associated with investing in
these bonds is effectively  mitigated,  for two reasons.  First,  we have a very
experienced  credit research team that is intimately  familiar with this part of
the  corporate  bond  market.  We're  relying on our credit team to help us find
attractive, quality securities among BB credits.

     Second,  we're taking a fairly  conservative  approach.  The BB bonds we're
buying tend to be issued by large, established companies with stable cash flows.
They're basically  "upgrade  candidates"--bonds  that are currently rated BB but
that we think are worthy of a higher rating.

     When a BB security is upgraded to a higher rating,  it often  experiences a
significant price increase because its newfound investment-grade status attracts
greater demand from investors.  We hope to benefit from upgrades in the BB bonds
we own.

WHAT'S YOUR INTEREST RATE OUTLOOK?

     We expect to see less  interest rate  volatility  than we did over the past
year.  We think the dramatic drop in interest  rates in 1998 was an  exaggerated
move caused by abnormal occurrences,  such as the rapid liquidation of positions
by highly  leveraged hedge funds. We don't anticipate that kind of steep decline
in interest rates happening  anytime soon.  Economic growth in the U.S.  remains
very strong, and we are starting to see signs of recovery around the globe. This
underlying  economic  strength has been  accompanied by modest  inflation.  As a
result,  we could see rates  increase  slightly or trade in a relatively  narrow
range.

HOW WILL THIS OUTLOOK INFLUENCE LIMITED-TERM BOND'S POSITIONING?

     With the continued  strength of the economy and interest  rates  relatively
stable to  modestly  higher,  we expect the  non-Treasury  segments  of the bond
market to perform best in the coming months. As a result,  we'll likely continue
to  maintain  a  sizable  position  in   higher-yielding   corporate  bonds  and
mortgage-backed securities.

[right margin]

"WE'RE HOLDING MORE BBB SECURITIES AS A RESULT OF OUR EFFORTS TO FIND THE BEST
RELATIVE VALUES IN THE MARKET."

PORTFOLIO COMPOSITION BY
CREDIT RATING
                   % OF FUND INVESTMENTS
                  AS OF             AS OF
                 4/30/99          10/31/98
AAA                48%               52%
AA                  1%                2%
A                  19%               18%
BBB                29%               22%
BB                  3%                6%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 38
for more information.


                                                  www.americancentury.com      7


Limited-Term Bond--Schedule of Investments
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
U.S. TREASURY SECURITIES--13.1%
                  $1,250   U.S. Treasury Notes, 5.50%,
                              3/31/00                              $ 1,256
                     500   U.S. Treasury Notes, 6.375%,
                              5/15/00                                  507
                     500   U.S. Treasury Notes, 5.375%,
                              7/31/00                                  502
                     350   U.S. Treasury Notes, 4.625%,
                              11/30/00                                 348
                                                                 -----------
TOTAL U.S. TREASURY SECURITIES                                       2,613
                                                                 -----------
   (Cost $2,613)

MORTGAGE-BACKED SECURITIES(1)--12.4%
                     335   FNMA Pool #313224, 7.00%,
                              12/1/11                                  343
                     484   FNMA Pool #313481, 7.00%,
                              4/1/12                                   496
                     265   FNMA Pool #378698, 8.00%,
                              5/1/12                                   275
                     425   FNMA Pool #411016, 6.50%,
                              3/1/13                                   429
                     488   FNMA Pool #426145, 6.00%,
                              5/1/13                                   485
                     453   FNMA Pool #433184, 6.50%,
                              6/1/13                                   458
                                                                 -----------
TOTAL MORTGAGE-BACKED SECURITIES                                     2,486
                                                                 -----------
   (Cost $2,477)

ASSET-BACKED SECURITIES(1)--14.3%
                     500   Case Equipment Loan Trust,
                              Series 1998 B, Class A4 SEQ,
                              5.92%, 10/15/05                          499
                     500   CIT RV Trust, Series 1997 A,
                              Class A5 SEQ, 6.25%,
                              11/17/08                                 503
                     167   First Merchants Auto Receivables
                              Corp., Series 1996 B, Class A2,
                              6.80%, 5/15/01                           169
                     250   FNMA Whole Loan,
                              Series 1995 W1, Class A6,
                              8.10%, 4/25/25                           256
                      91   Green Tree Financial Corp.,
                              Series 1995-7, Class A3,
                              6.35%, 11/15/26                           91
                     376   Money Store (The) Home Equity
                              Trust, Series 1994 B,
                              Class A4 SEQ, 7.60%, 7/15/21             386
                     390   Nationslink Funding Corp., Series
                              1998-2, Class A1 SEQ, 6.00%,
                              11/20/07                                 386


Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                  $  188   Textron Financial Corp.
                              Receivables Trust,
                              Series 1997 A, Class A, 6.05%,
                              3/16/09 (Acquired 9/18/97,
                              Cost $188)(2)                        $   188
                     150   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1996 D1, Class A4,
                              6.78%, 2/15/16                           152
                     234   World Omni Automobile Lease
                              Securitization, Series 1996 B,
                              Class A2, 6.20%, 11/15/02                235
                                                                 -----------
TOTAL ASSET-BACKED SECURITIES                                        2,865
                                                                 -----------
   (Cost $2,855)

CORPORATE BONDS--53.9%
AUTOMOBILES & AUTO PARTS--1.6%
                     300   General Motors Corp. Global
                              Notes, 9.625%, 12/1/00                   317
                                                                 -----------
BANKING--1.0%
                     200   Capital One Bank, 6.74%,
                              5/31/99                                  200
                                                                 -----------
CHEMICALS & RESINS--4.5%
                     400   IMC Global Inc., 7.40%, 11/1/02             410
                     500   Monsanto Co., 5.375%, 12/1/01
                              (Acquired 12/4/98,
                              Cost $499)(2)                            495
                                                                 -----------
                                                                       905
                                                                 -----------
ENERGY (PRODUCTION & MARKETING)--6.1%
                     400   Conoco Inc., 5.90%, 4/15/04                 398
                     400   KN Energy, Inc., 6.45%,
                              11/30/01                                 405
                     400   Oryx Energy Co., 9.50%,
                              11/1/99                                  406
                                                                 -----------
                                                                     1,209
                                                                 -----------
FINANCIAL SERVICES--16.7%
                     500   Caterpillar Financial Services
                              MTN, 6.49%, 10/15/99                     503
                     300   CIT Group, Inc. MTN, 6.625%,
                              9/13/99                                  302
                     350   Comdisco Inc., 7.75%, 9/1/99                352
                     250   Ford Motor Credit Co., 6.125%,
                              4/28/03                                  251
                     200   Franchise Finance Corp., 7.00%,
                              11/30/00                                 198
                     300   International Lease Finance Corp.,
                              6.375%, 1/18/00                          302
                     400   Lehman Brothers Holdings Inc.
                              MTN, Series E, 6.33%, 8/1/00             401
                     250   Merrill Lynch & Co., Inc., 6.50%,
                              4/1/01                                   254

                        See Notes to Financial Statements


8      1-800-345-2021


Limited-Term Bond--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                  $  385   Paine Webber Group Inc. MTN,
                              6.65%, 10/15/02                      $   387
                     400   Toyota Motor Credit Corp.,
                              5.625%, 11/13/03                         396
                                                                 -----------
                                                                     3,346
                                                                 -----------
INSURANCE--4.5%
                     400   Conseco Inc., 6.40%, 6/15/01                395
                     500   Fremont General Corp., 7.70%,
                              3/17/04 (Acquired 3/19/99,
                              Cost $504)(2)                            505
                                                                 -----------
                                                                       900
                                                                 -----------
RAILROAD--2.1%
                     415   Norfolk Southern Corp., 6.95%,
                              5/1/02                                   424
                                                                 -----------
REAL ESTATE--3.1%
                     300   Price REIT, Inc. (The), 7.25%,
                              11/1/00                                  305
                     300   Spieker Properties, Inc., 6.80%,
                              12/15/01                                 303
                                                                 -----------
                                                                       608
                                                                 -----------
RETAIL (APPAREL)--1.5%
                     300   Saks Inc., 7.25%, 12/1/04                   307
                                                                 -----------
RETAIL (FOOD & DRUG)--2.5%
                     500   Rite Aid Corp., 6.70%, 12/15/01             506
                                                                 -----------
STEEL--1.2%
                     250   Pohang Iron & Steel Co., Ltd.,
                              6.625%, 7/1/03                           240
                                                                 -----------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
TELEPHONE COMMUNICATIONS--5.2%
                  $  500   MCI WorldCom, Inc., 8.875%,
                              1/15/01                              $   538
                     500   U S West Capital Funding Inc.,
                              6.125%, 7/15/02                          504
                                                                 -----------
                                                                     1,042
                                                                 -----------
UTILITIES--1.3%
                     250   CalEnergy Co. Inc., 7.23%,
                              9/15/05                                  259
                                                                 -----------
WIRELESS COMMUNICATIONS--2.6%
                     500   AirTouch Communications, Inc.,
                              7.125%, 7/15/01                          513
                                                                 -----------
TOTAL CORPORATE BONDS                                               10,776
                                                                 -----------
   (Cost $10,734)

TEMPORARY CASH INVESTMENTS--6.3%
   247,000 Units of Participation in Chase
    Vista Prime Money Market Fund
    (Institutional Shares)                                             247
   Repurchase Agreement, BA Security Services,
    Inc., (U.S. Treasury obligations), in a joint
    trading account at 4.80%, dated 4/30/99,
    due 5/3/99 (Delivery value $1,010)                               1,010
                                                                 -----------

TOTAL TEMPORARY CASH INVESTMENTS                                     1,257
                                                                 -----------
   (Cost $1,257)

TOTAL INVESTMENT SECURITIES--100.0%                                $19,997
                                                                 ===========
   (Cost $19,936)

NOTES TO SCHEDULE OF INVESTMENTS

FNMA = Federal National Mortgage Association

MTN = Medium Term Note

(1)  Final maturity indicated.  Expected remaining maturity used for purposes of
     calculating the weighted average portfolio maturity.

(2)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value of restricted  securities  at April 30, 1999,  was $1,188,
     which represented 5.9% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percentage of investments in each industry, as applicable

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                  www.americancentury.com      9


Intermediate-Term Bond--Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF APRIL 30, 1999

                                  INVESTOR CLASS (INCEPTION 3/1/94)                          ADVISOR CLASS (INCEPTION 8/14/97)
                INTERMEDIATE-    LEHMAN INTERM.    INTERM. INVESTMENT-GRADE DEBT FUNDS(2)    INTERMEDIATE-    LEHMAN INTERM.
                  TERM BOND    GOVT./CORP. INDEX     AVERAGE RETURN    FUND'S RANKING           TERM BOND    GOVT./CORP. INDEX
<S>              <C>             <C>                <C>                 <C>                    <C>             <C>
6 MONTHS(1)         0.87%            0.51%               0.61%              --                    0.74%           0.51%
1 YEAR              5.61%            6.37%               5.12%         98 OUT OF 252              5.34%           6.37%
===========================================================================================================================
AVERAGE ANNUAL RETURNS
===========================================================================================================================
3 YEARS             7.04%            7.23%               7.19%         96 OUT OF 176               --              --
5 YEARS             6.94%            7.21%               7.15%         66 OUT OF 118               --              --
LIFE OF FUND        6.26%            6.48%               6.84%(3)      60 OUT OF 116(3)           6.16%          7.14%(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since  3/31/94,  the date nearest the class's  inception  for which data are
    available.

(4) Since  8/31/97,  the date nearest the class's  inception  for which data are
    available.

See  pages  37-39  for  more  information  about  share  classes,  returns,  the
comparative index, and Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 4/30/99
Lehman Intermediate
   Govt./Corp. Index       $13,838
Intermediate-Term Bond     $13,681

                   Intermediate-Term       Lehman Intermediate
                         Bond               Govt./Corp. Index
DATE                     VALUE                   VALUE
3/1/94                  $10,000                 $10,000
3/31/94                  $9,856                  $9,835
6/30/94                  $9,801                  $9,776
9/30/94                  $9,882                  $9,856
12/31/94                 $9,880                  $9,845
3/31/95                 $10,265                 $10,278
6/30/95                 $10,754                 $10,790
9/30/95                 $10,950                 $10,969
12/31/95                $11,374                 $11,356
3/31/96                 $11,217                 $11,261
6/30/96                 $11,255                 $11,332
9/30/96                 $11,451                 $11,533
12/31/96                $11,745                 $11,815
3/31/97                 $11,714                 $11,802
6/30/97                 $12,089                 $12,151
9/30/97                 $12,469                 $12,479
12/31/97                $12,707                 $12,746
3/31/98                 $12,906                 $12,945
6/30/98                 $13,135                 $13,188
9/30/98                 $13,676                 $13,780
12/31/98                $13,654                 $13,821
3/31/99                 $13,647                 $13,795
4/30/99                 $13,681                 $13,838

$10,000 investment made 3/1/94

The graph at left shows the growth of a $10,000  investment over the life of the
fund,  while the graph  below  shows the fund's  year-by-year  performance.  The
Lehman  Intermediate  Government/  Corporate Index is provided for comparison in
each graph.  Intermediate-Term  Bond's total returns include operating  expenses
(such as transaction  costs and management fees) that reduce returns,  while the
total  returns of the index do not.  These  graphs are based on  Investor  Class
shares only;  performance  for other classes will vary due to differences in fee
structures (see Total Returns table above).  Past performance does not guarantee
future  results.  Investment  return and  principal  value will  fluctuate,  and
redemption value may be more or less than original cost.

[bar graph - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDED APRIL 30)

                   Intermediate-Term     Lehman Intermediate
                        Bond              Govt./Corp. Index
DATE                   RETURN                 RETURN
4/30/94*               -2.16%                 -2.32%
4/30/95                 5.98%                  6.51%
4/30/96                 7.57%                  7.84%
4/30/97                 6.30%                  6.41%
4/30/98                 9.26%                  8.94%
4/30/99                 5.61%                  6.37%

* From the fund's 3/1/94 inception date to 4/30/94.


10      1-800-345-2021


Intermediate-Term Bond--Q&A
- --------------------------------------------------------------------------------
/photo of Bud Hoops and Jeff Houston/

     An interview  with Bud Hoops and Jeff  Houston,  portfolio  managers on the
Intermediate-Term Bond fund investment team.

HOW DID THE FUND PERFORM FOR THE SIX MONTHS ENDED APRIL 30, 1999?

     Intermediate-Term  Bond produced  positive  returns despite the increase in
interest rates (see page 3). For the six months,  the portfolio returned 0.87%.*
That compares  favorably with the 0.61% average return of the 268  "Intermediate
Investment-Grade Debt Funds" tracked by Lipper Inc.  Intermediate-Term Bond also
outperformed the Lehman Intermediate Government/Corporate Bond Index, which rose
0.51%. (See the previous page for additional performance comparisons.)

HOW DID INTERMEDIATE-TERM BOND'S  YIELD COMPARE?

     It was above  average.  The  portfolio's  30-day  SEC yield on April 30 was
5.58%,  while the average  yield for the Lipper group was 5.38%.  One reason for
the  portfolio's  better-than-average  yields and returns is our  relatively low
expenses.  Other  things  being  equal,  below-average  management  fees  should
translate into higher yields and returns for our shareholders.

THE  FUND'S  YIELD  ROSE  QUITE A BIT OVER THE LAST SIX  MONTHS  (FROM  4.95% TO
5.58%). WHY THE INCREASE?

     The higher yield is due in part to the overall  rise in interest  rates for
the last six months.  But that increase also reflects a conscious  effort on our
part  to  trade  out  of  Treasury  bonds  and  into  higher-yielding  corporate
securities.  That's part and parcel of our  relative-value  approach to managing
the fund--rather than make big bets on duration,  we try to enhance  performance
by buying undervalued securities.

     In  particular,  we monitor the spread,  or  difference  in yield,  between
Treasurys and corporate  bonds to determine when  corporates may be undervalued.
Generally  speaking,  the wider the spread, the better the value corporate bonds
represent.  In October,  the spread  between  corporates  and  Treasurys was the
widest we've seen since the  recession of 1990.  As a result,  we increased  our
corporate bond holdings from 46% of investments six months ago to 57% by the end
of  April.  At the same  time,  we  reduced  the  fund's  exposure  to  Treasury
securities from 33% of investments to 19%. (See the charts on page 12.)

DID THAT ASSET ALLOCATION SHIFT HELP PERFORMANCE?

     Yes, it did.  The change in  positioning  paid off in the first  quarter of
1999, when Treasurys were the  worst-performing  sector of the U.S. bond market,
while corporates and other higher-yielding bonds performed relatively

* All fund returns referenced in this interview are for Investor Class shares.

[right margin]

"INTERMEDIATE-TERM BOND PRODUCED POSITIVE RETURNS DESPITE THE INCREASE IN
INTEREST RATES."

PORTFOLIO AT A GLANCE
                              4/30/99           10/31/98
NUMBER OF SECURITIES            84                76
WEIGHTED AVERAGE
   MATURITY                   7.6 YRS           7.6 YRS
AVERAGE DURATION              4.8 YRS           4.9 YRS
EXPENSE RATIO (FOR
   INVESTOR CLASS)            0.75%*             0.75%

* Annualized.

YIELD AS OF APRIL 30, 1999
                             INVESTOR           ADVISOR
                              CLASS              CLASS
30-DAY SEC YIELD              5.58%              5.32%

Investment terms are defined in the Glossary on pages 39-40.


                                                 www.americancentury.com      11


Intermediate-Term Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

well. The Fed's rate cuts in late 1998  brightened the picture for  corporations
because lower rates reduced  borrowing costs. In addition,  U.S. economic growth
surged despite turmoil overseas. Those factors gave investors renewed confidence
that corporate earnings would stay strong.

YOU ALSO MENTIONED DURATION. CAN YOU DEFINE DURATION IN GENERAL AND EXPLAIN HOW
YOU MANAGED IT?

     Sure. Duration measures a bond's or bond portfolio's sensitivity to changes
in  interest  rates.  The longer the  duration,  the more you gain in price when
rates fall,  and the more you lose when rates rise. A shorter  duration  means a
bond portfolio's share price fluctuates less when rates change. So ideally,  you
want to lengthen  duration when interest rates are falling and shorten  duration
when rates are rising.

     But it can be  very  difficult  to  accurately  predict  the  direction  of
interest  rates  over the  short  run.  As a result,  we don't  make big bets on
interest rates.  Instead, we make only modest adjustments to duration over time,
typically  keeping it in a relatively narrow band between four and five years. A
good example is the last six months,  when duration was little changed at around
4.8 years.

AS OF SEPTEMBER 1, 1998,  INTERMEDIATE-TERM  BOND IS ALLOWED TO INVEST UP TO 15%
OF ASSETS IN SECURITIES RATED BB. CAN YOU ELABORATE ON THIS CHANGE?

     Sure.   Bonds   that  are  rated  AAA,   AA,  A,  or  BBB  are   considered
"investment-grade"  securities,  meaning they are relatively  safe from default.
Many funds and institutions concentrate exclusively on investment-grade bonds.

     In contrast,  bonds rated B and below are more  vulnerable to sudden swings
in credit quality.  As a result,  they typically offer high yields to compensate
for the additional  risk.  High-yield,  or "junk bond," investors focus on these
securities, as well as those that are unrated.

     That  leaves  BB-rated  bonds,   which  are  below  the  radar  screen  for
investment-grade   investors  but  don't  offer  enough  yield  for   high-yield
investors.  This area of the market can be overlooked and is often inefficiently
priced. We think we can find some great investment opportunities in this portion
of the market.

WON'T THESE BB SECURITIES MAKE THE FUND'S PORTFOLIO MORE RISKY?

     We believe the potential increase in risk is effectively  mitigated for two
reasons. First, we have a very experienced credit research team that is familiar
with this part of the corporate bond market. We're relying on our credit team to
help us find attractive, quality securities among BB credits.

     Second, we're taking a fairly conservative  approach.  Most of the BB bonds
we're buying have been issued by large,  established  companies with stable cash
flows. We particularly seek out "upgrade  candidates"--bonds  that are currently
rated BB but that we think are worthy of a higher rating.

     When a BB security is upgraded to a higher rating,  it often  experiences a
significant price increase because its newfound investment-grade status attracts
greater demand from investors.  We look to benefit from upgrades in the BB bonds
we own.

[left margin]

"IN OCTOBER, THE SPREAD, OR DIFFERENCE IN YIELD, BETWEEN CORPORATES AND
TREASURYS WAS THE WIDEST WE'VE SEEN SINCE THE RECESSION OF 1990."

[pie charts - data below]

PORTFOLIO COMPOSITION BY
SECURITY TYPE

AS OF APRIL 30, 1999
Corporate Bonds         57%
U.S. Treasury           19%
Mortgage-Backed         14%
Asset-Backed             8%
Other                    2%

AS OF OCTOBER 31, 1998
Corporate Bonds         46%
U.S. Treasury           33%
Mortgage-Backed         12%
Asset-Backed             7%
Other                    2%

Security types are defined on pages 39-40.


12      1-800-345-2021


Intermediate-Term Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

HAVE YOU BEEN VERY ACTIVE IN THAT AREA?

     We've  increased  our holdings of BB  securities.  At the end of April,  BB
bonds  accounted  for a little more than 10% of assets.  A good  example of a BB
security in the portfolio is a bond issued by Qwest  Communications,  which is a
growing   telecommunications   company  that  builds  and  operates  fiber-optic
networks.  The  telecommunications  industry in general  tends to be  relatively
insulated  from  changes  in the  business  cycle.  On top of that,  Qwest has a
significant   cost  advantage  over  its  competitors   through  its  internally
developed,  state-of-the-art systems. We expect Qwest eventually to be upgraded,
and the bonds should see a nice price gain if that happens.

WHAT'S YOUR INTEREST RATE OUTLOOK?

     We expect to see less  interest rate  volatility  than we did over the past
year.  We think the dramatic drop in interest  rates in 1998 was an  exaggerated
move caused by abnormal occurrences,  such as the rapid liquidation of positions
by highly  leveraged  hedge  funds.  Economic  growth in the U.S.  remains  very
strong,  and we are  starting  to see signs of recovery  around the globe.  This
underlying  economic  strength has been  accompanied by modest  inflation.  As a
result, we could see rates increase modestly.

     While strong growth would be positive for corporate  bonds,  there are some
risks to this outlook.  Increasing  inflation could cause the Federal Reserve to
raise rates.  Other  potential  hazards for corporate bonds include a decline in
the stock market, a significant  slowdown in the U.S. economy, or a worsening of
the  situation  in Asia  and  Latin  America,  as well  as  possible  unforeseen
disruptions around the year 2000.

HOW WILL THIS OUTLOOK INFLUENCE INTERMEDIATE-TERM BOND'S POSITIONING?

     We expect the  non-Treasury  segments of the bond market to perform best in
the  coming  months.  As a result,  we'll  likely  underweight  Treasurys  while
maintaining a larger stake in corporate  bonds. If we're right and yield spreads
continue to narrow, the portfolio should perform reasonably well.

[right margin]

"IF WE'RE RIGHT AND YIELD SPREADS CONTINUE TO NARROW, THE PORTFOLIO SHOULD
PERFORM REASONABLY WELL."

PORTFOLIO COMPOSITION BY
CREDIT RATING
                    % OF FUND INVESTMENTS
                   AS OF             AS OF
                  4/30/99          10/31/98
AAA                 45%               52%
AA                   5%                4%
A                   17%               18%
BBB                 23%               18%
BB                  10%                8%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 38
for more information.


                                                 www.americancentury.com      13


Intermediate-Term Bond--Schedule of Investments
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------
U.S. TREASURY SECURITIES--19.2%
                  $  750    U.S. Treasury Notes, 5.50%,
                              3/31/00                              $   754
                     350   U.S. Treasury Notes, 5.50%,
                              12/31/00                                 352
                     300   U.S. Treasury Notes, 5.375%,
                              2/15/01                                  302
                     100   U.S. Treasury Notes, 7.75%,
                              2/15/01                                  105
                   1,000   U.S. Treasury Notes, 4.875%,
                              3/31/01                                  996
                     200   U.S. Treasury Notes, 6.625%,
                              7/31/01                                  206
                     300   U.S. Treasury Notes, 6.50%,
                              5/31/02                                  311
                     600   U.S. Treasury Notes, 7.25%,
                              5/15/04                                  652
                   1,000   U.S. Treasury Notes, 4.75%,
                              11/15/08                                 956
                     300   U.S. Treasury Bonds, 9.25%,
                              2/15/16                                  406
                     350   U.S. Treasury Bonds, 9.125%,
                              5/15/18                                  477
                     400   U.S. Treasury Bonds, 7.50%,
                              11/15/24                                 483
                     300   U.S. Treasury Bonds, 6.50%,
                              11/15/26                                 324
                                                                 -----------
TOTAL U.S. TREASURY SECURITIES                                       6,324
                                                                 -----------
   (Cost $6,388)

MORTGAGE-BACKED SECURITIES(1)--13.7%
                     483   FHLMC Pool #E00279, 6.50%,
                              2/1/09                                   491
                     266   FHLMC Pool #C00578, 6.50%,
                              1/1/28                                   265
                     203   FHLMC Pool #G00907, 7.00%,
                              2/1/28                                   206
                     339   FNMA Pool #427913, 6.00%,
                              5/1/13                                   337
                     214   FNMA Pool #413812, 6.50%,
                              1/1/28                                   213
                     296   FNMA Pool #411821, 7.00%,
                              1/1/28                                   301
                     301   FNMA Pool #450619, 6.00%,
                              12/1/28                                  293
                     302   FNMA Pool #454947, 6.00%,
                              12/1/28                                  293
                     298   FNMA Pool #252211, 6.00%,
                              1/1/29                                   289
                     353   GNMA Pool #002202, 7.00%,
                              4/20/26                                  358
                     271   GNMA Pool #780412, 7.50%,
                              8/15/26                                  280

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                 $   260   GNMA Pool #467626, 7.00%,
                              2/15/28                            $     265
                     164   GNMA Pool #458862, 7.50%,
                              2/15/28                                  170
                     399   GNMA Pool #436277, 6.50%,
                              3/15/28                                  398
                     350   GNMA Pool #469811, 7.00%,
                              12/15/28                                 356
                                                                 -----------
TOTAL MORTGAGE-BACKED SECURITIES                                     4,515
                                                                 -----------
   (Cost $4,493)

ASSET-BACKED SECURITIES(1)--7.9%
                     251   First Merchants Auto Receivables
                              Corp., Series 1996 B, Class A2,
                              6.80%, 5/15/01                           253
                     477   First Union-Lehman Brothers
                              Commercial Mortgage,
                              Series 1998 C2, Class A1 SEQ,
                              6.28%, 6/18/07                           479
                     600   GMAC Commercial Mortgage
                              Securities Inc., Series 1999 C1,
                              Class A2 SEQ, 6.18%,
                              5/15/33                                  589
                     341   Nationslink Funding Corp.,
                              Series 1998-2, Class A1 SEQ,
                              6.00%, 11/20/07                          338
                     250   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1996 D1, Class A4,
                              6.78%, 2/15/16                           253
                     400   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1996 D1, Class A5,
                              6.92%, 10/15/18                          407
                     300   United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1997 C, Class A7,
                              6.85%, 1/15/29                           305
                                                                 -----------
TOTAL ASSET-BACKED SECURITIES                                        2,624
                                                                 -----------
   (Cost $2,630)

CORPORATE BONDS--56.8%
AIRLINES--1.5%
                     500   Continental Airlines, Inc., 8.00%,
                              12/15/05                                 500
                                                                 -----------
BANKING--4.7%
                     500   BankAmerica Corp., 7.75%,
                              7/15/02                                  526
                     300   Capital One Bank, 5.95%,
                              2/15/01                                  298
                     250   Corestates Capital Corp., 5.875%,
                              10/15/03                                 248

                                              See Notes to Financial Statements


14      1-800-345-2021


Intermediate-Term Bond--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                 $   500   Fleet National Bank, 5.75%,
                              1/15/09                              $   475
                                                                 -----------
                                                                     1,547
                                                                 -----------
BROADCASTING & MEDIA--2.3%
                     500   British Sky Broadcasting, 6.875%,
                              2/23/09                                  499
                     250   CSC Holdings Inc., 7.625%,
                              7/15/18                                  252
                                                                 -----------
                                                                       751
                                                                 -----------
BUSINESS SERVICES & SUPPLIES--1.2%
                     400   LCI International, Inc., 7.25%,
                              6/15/07                                  412
                                                                 -----------
CHEMICALS & RESINS--2.9%
                     600   IMC Global Inc., 7.40%, 11/1/02             615
                     350   Monsanto Co., 6.60%, 12/1/28
                              (Acquired 12/4/98,
                              Cost $349)(2)                            334
                                                                 -----------
                                                                       949
                                                                 -----------
DIVERSIFIED COMPANIES--0.8%
                     300   Hutchison Whampoa Financial,
                              7.50%, 8/1/27 (Acquired
                              4/7/99, Cost $261)(2)                    270
                                                                 -----------
ELECTRICAL & ELECTRONIC
COMPONENTS--0.9%
                     300   Anixter International Inc., 8.00%,
                              9/15/03                                  309
                                                                 -----------
ENERGY (PRODUCTION & MARKETING)--4.3%
                     500   Enron Corp., 6.625%, 11/15/05               498
                     600   KN Energy, Inc., 6.45%,
                              11/30/01                                 608
                     300   USX Corp., 6.85%, 3/1/08                    299
                                                                 -----------
                                                                     1,405
                                                                 -----------
ENERGY (SERVICES)--1.0%
                     350   Petroleum Geo-Services ASA,
                              7.125%, 3/30/28                          333
                                                                 -----------
FINANCIAL SERVICES--7.3%
                     500   Associates Corp., N.A., 6.25%,
                              11/1/08                                  496
                     250   Ford Motor Credit Co., 6.125%,
                              4/28/03                                  251
                     300   Franchise Finance Corp., 7.00%,
                              11/30/00                                 296
                     500   Lehman Brothers Holdings Inc.
                              MTN, Series E, 6.33%, 8/1/00             501
                     250   Merrill Lynch & Co., Inc., 6.50%,
                              4/1/01                                   254
                     600   Toyota Motor Credit Corp.,
                              5.625%, 11/13/03                         594
                                                                 -----------
                                                                     2,392
                                                                 -----------

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

HEALTHCARE--0.9%
                 $   300   Aetna Services, Inc., 6.75%,
                              8/15/01                              $   305
                                                                 -----------
INSURANCE--3.4%
                     400   Conseco Financing Trust II, 8.70%,
                              11/15/26                                 375
                     500   Conseco Inc., 6.40%, 6/15/01                494
                     250   Nationwide Mutual Insurance Co.,
                              6.50%, 2/15/04 (Acquired
                              2/9/96, Cost $252)(2)                    252
                                                                 -----------
                                                                     1,121
                                                                 -----------
METALS & MINING--1.3%
                     400   Barrick Gold Corp., 7.50%,
                              5/1/07                                   421
                                                                 -----------
PACKAGING & CONTAINERS--1.5%
                     500   Owens-Illinois Inc., 7.15%,
                              5/15/05                                  495
                                                                 -----------
PAPER & FOREST PRODUCTS--0.9%
                     300   Abitibi-Consolidated Inc., 7.40%,
                              4/1/18                                   290
                                                                 -----------
REAL ESTATE--4.2%
                     550   Chelsea GCA Realty Partners,
                              7.25%, 10/21/07                          514
                     350   Price REIT, Inc. (The), 7.25%,
                              11/1/00                                  356
                     200   Price REIT, Inc. (The), 7.125%,
                              6/15/04                                  205
                     300   Spieker Properties, Inc., 6.80%,
                              12/15/01                                 303
                                                                 -----------
                                                                     1,378
                                                                 -----------
RETAIL (APPAREL)--1.9%
                     300   Saks Inc., 7.25%, 12/1/04                   307
                     300   Saks Inc., 8.25%, 11/15/08                  325
                                                                 -----------
                                                                       632
                                                                 -----------
RETAIL (GENERAL MERCHANDISE)--0.6%
                     200   Sears, Roebuck & Co., Inc. MTN,
                              8.29%, 6/10/02                           212
                                                                 -----------
STEEL--1.2%
                     400   Pohang Iron & Steel Co., Ltd.,
                              7.375%, 5/15/05                          393
                                                                 -----------
TELEPHONE COMMUNICATIONS--6.2%
                     500   Cable & Wireless Communications
                              plc, 6.625%, 3/6/05                      504
                     500   MCI WorldCom, Inc., 8.875%,
                              1/15/01                                  538
                     400   MCI WorldCom, Inc., 6.40%,
                              8/15/05                                  403

See Notes to Financial Statements


                                                 www.americancentury.com      15


Intermediate-Term Bond--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                 $   250   Qwest Communications
                              International Inc., 7.50%,
                              11/1/08 (Acquired 10/28/98,
                              Cost $248)(2)                        $   263
                     350   Sprint Capital Corp., 6.875%,
                              11/15/28                                 339
                                                                 -----------
                                                                     2,047
                                                                 -----------
UTILITIES--4.1%
                     150   CalEnergy Co. Inc., 7.23%,
                              9/15/05                                  155
                     400   Empresa Nacional de Electricidad
                              S.A. (Chile), 8.50%, 4/1/09
                              (Acquired 4/21/99,
                              Cost $431)(2)                            430
                     500   Georgia Power Co., 5.50%,
                              12/1/05                                  484
                     300   Yorkshire Power Finance, Series B,
                              6.15%, 2/25/03 (Acquired
                              2/19/98, Cost $300)(2)                   299
                                                                 -----------
                                                                     1,368
                                                                 -----------
WIRELESS COMMUNICATIONS--3.7%
                     600   AirTouch Communications, Inc.,
                              7.125%, 7/15/01                          616

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                 $   500   TCI Communications, Inc., 8.75%,
                              8/1/15                               $   601
                                                                 -----------
                                                                     1,217
                                                                 -----------
TOTAL CORPORATE BONDS                                               18,747
                                                                 -----------
   (Cost $18,728)

SOVEREIGN GOVERNMENTS & AGENCIES--0.9%
                     300   Province of British Columbia,
                              5.375%, 10/29/08                         285
                                                                 -----------
   (Cost $298)

TEMPORARY CASH INVESTMENTS--1.5%
   Repurchase Agreement, BA Security Services,
    Inc., (U.S. Treasury obligations), in a joint
    trading account at 4.80%, dated 4/30/99,
    due 5/3/99 (Delivery value $492)                                   492
                                                                 -----------
   (Cost $492)

TOTAL INVESTMENT SECURITIES--100.0%                                $32,987
                                                                 ===========
   (Cost $33,029)

NOTES TO SCHEDULE OF INVESTMENTS

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

GNMA = Government National Mortgage Association

MTN = Medium Term Note

(1)  Final maturity indicated.  Expected remaining maturity used for purposes of
     calculating the weighted average portfolio maturity.

(2)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value of restricted  securities  at April 30, 1999,  was $1,848,
     which represented 5.5% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percentage of investments in each industry, as applicable

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


16      1-800-345-2021


Bond--Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF APRIL 30, 1999

                                INVESTOR CLASS (INCEPTION 3/2/87)                      ADVISOR CLASS (INCEPTION 8/8/97)
                              LEHMAN AGGREGATE   A-RATED CORPORATE DEBT FUNDS(2)                    LEHMAN AGGREGATE
                    BOND         BOND INDEX      AVERAGE RETURN   FUND'S RANKING          BOND         BOND INDEX
<S>                 <C>           <C>            <C>               <C>              <C>             <C>
6 MONTHS(1)         0.08%          0.69%             0.38%              --               -0.05%           0.69%
1 YEAR              3.87%          6.27%             4.78%        125 OUT OF 156          3.61%           6.27%
====================================================================================================================
AVERAGE ANNUAL RETURNS
====================================================================================================================
3 YEARS             6.85%          8.07%             7.33%         93 OUT OF 128           --              --
5 YEARS             7.21%          8.03%             7.31%         45 OUT OF 85            --              --
10 YEARS            8.14%          8.89%             8.44%         27 OUT OF 42            --              --
LIFE OF FUND        7.37%          8.26%             7.99%(3)      24 OUT OF 28(3)        5.66%         7.80%(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since  3/31/87,  the date nearest the class's  inception  for which data are
    available.

(4) Since  8/31/97,  the date nearest the class's  inception  for which data are
    available.

See  pages  37-39  for  more  information  about  share  classes,  returns,  the
comparative index, and Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 4/30/99
Lehman Aggregate
   Bond Index           $23,429
Bond                    $21,870
                                           Lehman Aggregate
                         Bond                  Bond Index
DATE                     VALUE                   VALUE
4/30/89                 $10,000                 $10,000
4/30/90                 $10,538                 $10,903
4/30/91                 $12,181                 $12,559
4/30/92                 $13,647                 $13,941
4/30/93                 $15,400                 $15,789
4/30/94                 $15,440                 $15,923
4/30/95                 $16,462                 $17,087
4/30/96                 $17,930                 $18,564
4/30/97                 $19,123                 $19,878
4/30/98                 $21,058                 $22,047
4/30/99                 $21,870                 $23,429

$10,000 investment made 4/30/89

The graph at left shows the growth of a $10,000  investment  in the fund over 10
years,  while the graph below  shows the fund's  year-by-year  performance.  The
Lehman  Aggregate  Bond Index is provided for  comparison in each graph.  Bond's
total  returns  include  operating  expenses  (such  as  transaction  costs  and
management  fees) that reduce  returns,  while the total returns of the index do
not. These graphs are based on Investor Class shares only; performance for other
classes will vary due to differences in fee structures  (see Total Returns table
above).  Past performance does not guarantee future results.  Investment  return
and principal  value will  fluctuate,  and redemption  value may be more or less
than original cost.

[bar graph - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDED APRIL 30)

                                         Lehman Aggregate
                        Bond                Bond Index
DATE                   RETURN                 RETURN
4/30/90                 5.38%                  9.03%
4/30/91                15.59%                 15.19%
4/30/92                12.04%                 11.00%
4/30/93                12.84%                 13.26%
4/30/94                 0.26%                  0.85%
4/30/95                 6.62%                  7.31%
4/30/96                 8.92%                  8.64%
4/30/97                 6.65%                  7.08%
4/30/98                10.12%                 10.91%
4/30/99                 3.87%                  6.27%


                                                 www.americancentury.com      17


Bond--Q&A
- --------------------------------------------------------------------------------

     An  interview  with Bud  Hoops  and Jeff  Houston  (pictured  on page  11),
portfolio managers on the Bond fund investment team.

HOW DID THE FUND PERFORM DURING THE SIX MONTHS ENDED APRIL 30, 1999?

     Bond's returns were affected by a difficult  investment climate.  While the
capital markets  generally  recovered from the economic and financial turmoil we
saw in the third quarter of 1998,  bond returns were limited by rising  interest
rates (see page 3). For the six  months,  Bond  returned  0.08%.*  According  to
Lipper Inc., the "A-Rated  Corporate Debt Fund" category averaged a 0.38% return
for  the  same  period.  (See  the  previous  page  for  additional  performance
comparisons.)

CAN YOU  EXPLAIN A LITTLE  BIT MORE ABOUT  BOND'S  PERFORMANCE  RELATIVE  TO ITS
LIPPER GROUP?

     We manage the portfolio primarily as a corporate bond fund, so we hold more
corporate  securities  and fewer  Treasurys than many of the funds in the Lipper
group.  That was a difficult  position to be in during 1998.  One way to measure
the relative  performance  of Treasurys  and  corporate  bonds is to look at the
spread, or difference in yield,  between them. A widening spread means Treasurys
outperform,  while a narrower spread means corporates do better. In October, the
spread  between  corporates  and  Treasurys  was the widest we've seen since the
recession of 1990.

     Though the yield spread  narrowed in 1999,  spreads are still  nowhere near
the levels we witnessed  before the global  financial  turmoil hit. So our heavy
weighting in corporate  securities  meant we  performed  better  relative to the
Lipper group in early 1999 than we did in 1998, and we could do even better on a
relative basis if and when spreads return to more normal levels.

YOU MENTIONED THAT RISING RATES LIMITED RETURNS. HOW DID YOU MANAGE THE
PORTFOLIO'S INTEREST RATE SENSITIVITY?

     We  make  only  modest  adjustments  to  duration  (a  measure  of  a  bond
portfolio's  sensitivity to rate changes) over time,  typically  keeping it in a
relatively  narrow  band  around  five  years.  The last six  months  are a good
example,  when we kept duration little changed at around 5.3 years.  Rather than
make big bets on interest rates, we try to enhance  performance by concentrating
assets in undervalued securities or sectors of the market.

WHERE DID YOU THINK SOME OF THE BEST  RELATIVE  VALUES IN THE BOND  MARKET  WERE
OVER THE LAST SIX MONTHS?

     With yield spreads so wide, we believed corporate and other higher-yielding
bonds offered very  attractive  buying  opportunities.  So over the last several
months,  we cut the  fund's  Treasury  holdings  and added  attractively  priced
corporate,  mortgage-, and asset-backed  securities.  We reduced the portfolio's
exposure to Treasury securities from 18% of investments at the end of October to
only 7% by April 30. Our biggest  increase  was in corporate  bonds,  which went
from 64% of  investments  six  months  ago to more than 70% by the end of April.
(See the charts on the following page.) Again, those changes

* All fund returns referenced in this interview are for Investor Class shares.

[left margin]

"BOND'S RETURNS WERE AFFECTED BY A DIFFICULT INVESTMENT CLIMATE."

PORTFOLIO AT A GLANCE
                              4/30/99           10/31/98
NUMBER OF SECURITIES            62                56
WEIGHTED AVERAGE
   MATURITY                   9.7 YRS          10.6 YRS
AVERAGE DURATION              5.3 YRS           5.3 YRS
EXPENSE RATIO (FOR
   INVESTOR CLASS)            0.80%*             0.80%

* Annualized.

YIELD AS OF APRIL 30, 1999
                             INVESTOR           ADVISOR
                              CLASS              CLASS
30-DAY SEC YIELD              5.84%              5.59%

Investment terms are defined in the Glossary on pages 39-40.


18      1-800-345-2021


Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

helped  performance in the first quarter of 1999, when Treasurys  underperformed
corporate and mortgage-backed securities.

HAS BUYING MORE CORPORATE SECURITIES TRANSLATED INTO A HIGHER YIELD FOR THE
FUND?

     Yes, that factor was a sort of silver lining for the fund over the past six
months.  In part because we purchased more  higher-yielding  securities,  Bond's
30-day  SEC  yield  rose more than  half a  percentage  point  over the last six
months,  from 5.24% to 5.84%.  That yield compares very favorably with the 5.35%
average yield of the Lipper group.

ANOTHER ASPECT OF INVESTING IN THE CORPORATE MARKET IS CREDIT QUALITY. HOW DO
YOU TRY TO MANAGE CREDIT RISK?

     We use a credit-intensive approach to security selection, trying to provide
the best  combination  of yields  and  returns  while  minimizing  risks for our
shareholders.  To do that, we rely on our team of experienced  corporate  credit
analysts,  who work  closely  with us in  selecting  securities.  We think  this
hands-on approach can help us find undervalued securities and boost performance

     To take better  advantage of our credit team's  ability and  expertise,  we
also  began to invest a small  portion  of the fund (up to a maximum  of 15%) in
corporate  bonds  rated BB.  This is an area where we think the credit  team can
really add value to the fund's performance.

CAN YOU ELABORATE ON THIS CHANGE?

     Sure.   Bonds   that  are  rated  AAA,   AA,  A,  or  BBB  are   considered
"investment-grade"  securities,  meaning they are relatively  safe from default.
Many funds and institutions concentrate exclusively on investment-grade bonds.

     In contrast,  bonds rated B and below are more  vulnerable to sudden swings
in credit quality.  As a result,  they typically offer high yields to compensate
for the additional  risk.  High-yield,  or "junk bond," investors focus on these
securities, as well as those that are unrated.

     That  leaves  BB  rated  bonds,  which  are  below  the  radar  screen  for
investment-grade   investors  but  don't  offer  enough  yield  for   high-yield
investors.  This area of the market can be overlooked and is often inefficiently
priced. We think we can find some great investment opportunities in this portion
of the market.

WON'T THESE BB SECURITIES MAKE THE FUND'S PORTFOLIO MORE RISKY?

     We believe the potential increase in risk is effectively  mitigated for two
reasons.  First,  we  think  our  experienced  credit  research  team,  which is
intimately  familiar  with this part of the corporate  bond market,  can help us
find attractive, quality securities among BB credits.

     Second, we're taking a fairly conservative  approach.  Most of the BB bonds
we're buying have been issued by large,  established  companies with stable cash
flows. We particularly seek out "upgrade  candidates"--bonds  that are currently
rated BB but that we think are worthy of a higher rating.

[right margin]

"RATHER THAN MAKE BIG BETS ON INTEREST RATES, WE TRY TO ENHANCE PERFORMANCE BY
CONCENTRATING ASSETS IN UNDERVALUED SECURITIES OR SECTORS OF THE MARKET."

[pie charts - data below]

PORTFOLIO COMPOSITION BY
SECURITY TYPE

AS OF APRIL 30, 1999
Corporate Bonds         71%
Mortgage-Backed         12%
Asset-Backed             7%
U.S. Treasury            7%
Other                    3%

AS OF OCTOBER 31, 1998
Corporate Bonds         64%
U.S. Treasury           18%
Mortgage-Backed          9%
Asset-Backed             5%
Other                    4%

Security types are defined on pages 39-40.


                                                 www.americancentury.com      19


Bond--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

     When a BB security is upgraded to a higher rating,  it often  experiences a
significant price increase because its newfound investment-grade status attracts
greater demand from  investors.  We look to benefit from such upgrades in the BB
bonds we own.

CAN YOU GIVE AN EXAMPLE OF ONE OF YOUR BB BONDS?

     We bought  some bonds  issued by Qwest  Communications,  which is a growing
telecommunications  company that builds and operates fiber-optic  networks.  The
telecommunications  industry in general  tends to be relatively  insulated  from
changes in the business  cycle.  On top of that,  Qwest has a  significant  cost
advantage   over   its   competitors    through   its   internally    developed,
state-of-the-art  systems.  We expect Qwest  eventually to be upgraded,  and the
bonds should see a nice price gain if that happens.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

     We expect to see less  interest rate  volatility  than we did over the past
year.  We think the dramatic drop in interest  rates in 1998 was an  exaggerated
move caused by abnormal occurrences,  such as the rapid liquidation of positions
by highly  leveraged  hedge  funds.  Economic  growth in the U.S.  remains  very
strong,  and we are  starting  to see signs of recovery  around the globe.  This
underlying  economic  strength has been  accompanied by modest  inflation.  As a
result, we could see rates increase modestly.

     While strong growth would be positive for corporate  bonds,  there are some
risks to this outlook.  Increasing  inflation could cause the Federal Reserve to
raise rates.  Other  potential  hazards for corporate bonds include a decline in
the stock market, a significant  slowdown in the U.S. economy, or a worsening of
the  situation  in Asia  and  Latin  America,  as well  as  possible  unforeseen
disruptions around the year 2000.

HOW WILL THIS OUTLOOK INFLUENCE BOND'S POSITIONING?

     We expect the  non-Treasury  segments of the bond market to perform best in
the  coming  months.  As a result,  we'll  likely  underweight  Treasurys  while
maintaining a larger stake in corporate  bonds. If we're right and yield spreads
continue to narrow, the portfolio should perform reasonably well going forward.

[left margin]

"IF WE'RE RIGHT AND YIELD SPREADS CONTINUE TO NARROW, THE PORTFOLIO SHOULD
PERFORM REASONABLY WELL."

PORTFOLIO COMPOSITION BY
CREDIT RATING
                     % OF FUND INVESTMENTS
                    AS OF             AS OF
                   4/30/99          10/31/98
AAA                  31%               35%
AA                    5%                3%
A                    30%               27%
BBB                  21%               27%
BB                   13%                8%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 38
for more information.


20      1-800-345-2021


Bond--Schedule of Investments
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------
U.S. TREASURY SECURITIES--6.8%
                   $1,000  U.S. Treasury Notes, 4.625%,
                              11/30/00                             $    994
                    4,000  U.S. Treasury Notes, 5.625%,
                              12/31/02                                4,052
                    2,000  U.S. Treasury Notes, 7.25%,
                              5/15/04                                 2,172
                    2,000  U.S. Treasury Notes, 7.875%,
                              11/15/04                                2,242
                                                                 ------------
TOTAL U.S. TREASURY SECURITIES                                        9,460
                                                                 ------------
   (Cost $9,514)

U.S. GOVERNMENT AGENCY SECURITIES--1.4%
                    2,000  TVA, 6.875%, 12/15/43                      1,932
                                                                 ------------
   (Cost $1,854)

MORTGAGE-BACKED SECURITIES(1)--12.5%
                    4,360  FHLMC Pool #E68681, 6.00%,
                              1/1/13                                  4,335
                    2,996  FHLMC Pool #C00731, 6.50%,
                              3/1/29                                  2,986
                      171  FHLMC REMIC, Series 116,
                              Class F PAC, 8.50%, 2/15/20               172
                    2,992  FNMA Pool #484698, 6.00%,
                              2/1/14                                  2,972
                    3,372  FNMA Pool #250452, 6.50%,
                              1/1/26                                  3,366
                    2,976  FNMA Pool #252211, 6.00%,
                              1/1/29                                  2,891
                      540  FNMA REMIC, Series 1989-35,
                              Class G, 9.50%, 7/25/19                   569
                                                                 ------------
TOTAL MORTGAGE-BACKED SECURITIES                                     17,291
                                                                 ------------
   (Cost $13,796)

ASSET-BACKED SECURITIES(1)--6.8%
                    2,500  AMRESCO, INC., Series 1998-2,
                              Class A4 SEQ, 6.45%,
                              4/25/27                                 2,480
                    2,000  Comed Transitional Funding Trust,
                              Series 1998-1, Class A6 SEQ,
                              5.63%, 6/25/09                          1,948
                    2,400  GMAC Commercial Mortgage
                              Securities Inc., Series 1999 C1,
                              Class A2 SEQ, 6.18%,
                              5/15/33                                 2,354
                    1,949  Nationslink Funding Corp.,
                              Series 1998-2, Class A1 SEQ,
                              6.00%, 11/20/07                         1,932

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                   $  730  United Companies Financial Corp.,
                              Home Equity Loan,
                              Series 1995 D1, Class A2,
                              6.20%, 3/10/14                       $    731
                                                                 ------------
TOTAL ASSET-BACKED SECURITIES                                         9,445
                                                                 ------------
   (Cost $9,620)

CORPORATE BONDS--70.6%
AIRLINES--3.4%
                    1,500  Continental Airlines, Inc., 8.00%,
                              12/15/05                                1,500
                    3,101  Delta Air Lines, Inc., 7.54%,
                              10/11/11                                3,184
                                                                 ------------
                                                                      4,684
                                                                 ------------
BANKING--9.5%
                    3,000  Citigroup Inc. Euro, 7.00%,
                              1/2/04                                  3,099
                    2,000  Corestates Capital Corp., 5.875%,
                              10/15/03                                1,985
                    2,000  Fleet National Bank, 5.75%,
                              1/15/09                                 1,900
                    3,000  Mellon Financial Co., 6.00%,
                              3/1/04                                  2,995
                    3,000  National Bank of Canada, 8.125%,
                              8/15/04                                 3,246
                                                                 ------------
                                                                     13,225
                                                                 ------------
BROADCASTING & MEDIA--2.9%
                    2,000  British Sky Broadcasting, 6.875%,
                              2/23/09                                 1,996
                    2,000  CSC Holdings Inc., 7.25%,
                              7/15/08                                 2,029
                                                                 ------------
                                                                      4,025
                                                                 ------------
CHEMICALS & RESINS--3.7%
                    3,000  ARCO Chemical Co., 10.25%,
                              11/1/10                                 3,155
                    2,000  Monsanto Co., 6.60%, 12/1/28
                              (Acquired 12/4/98, Cost
                              $1,993)(2)                              1,908
                                                                 ------------
                                                                      5,063
                                                                 ------------
COMPUTER SYSTEMS--1.1%
                    1,500  International Business Machines
                              Corp., 7.125%, 12/1/96                  1,544
                                                                 ------------
DIVERSIFIED COMPANIES--1.0%
                    1,500  Hutchison Whampoa Financial,
                              7.50%, 8/1/27 (Acquired
                              4/7/99, Cost $1,303)(2)                 1,350
                                                                 ------------
ENERGY (PRODUCTION & MARKETING)--6.3%
                    3,000  Columbia Energy Group, 7.42%,
                              11/28/15                                2,988
                    2,500  Enron Corp., 6.625%, 11/15/05              2,492

See Notes to Financial Statements


                                                 www.americancentury.com      21


Bond--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

                 $  3,000  Oryx Energy Co., 8.125%,
                              10/15/05                             $  3,216
                                                                 ------------
                                                                      8,696
                                                                 ------------
ENERGY (SERVICES)--1.0%
                    1,500  Petroleum Geo-Services ASA,
                              7.125%, 3/30/28                         1,429
                                                                 ------------
FINANCIAL SERVICES--8.0%
                    2,000  Associates Corp., N.A., 6.25%,
                              11/1/08                                 1,983
                    2,000  Comdisco, Inc., 6.375%,
                              11/30/01                                2,014
                    3,000  Ford Motor Credit Co., 6.50%,
                              2/28/02                                 3,055
                    2,000  Lehman Brothers Holdings Inc.
                              MTN, Series E, 6.33%, 8/1/00            2,003
                    2,000  Toyota Motor Credit Corp., 5.625%,
                              11/13/03                                1,979
                                                                 ------------
                                                                     11,034
                                                                 ------------
FOOD & BEVERAGE--2.1%
                    3,000  Pepsico, Inc., 5.625%, 2/17/09
                              (Acquired 2/3/99,
                              Cost $2,987)(2)                         2,864
                                                                 ------------
INSURANCE--6.0%
                    2,500  Conseco Financing Trust II, 8.70%,
                              11/15/26                                2,345
                    1,500  Conseco Inc., 6.40%, 6/15/01               1,482
                    1,000  Delphi Financial Group, Inc.,
                              9.31%, 3/25/27                          1,082
                    3,000  Lincoln National Corp., 9.125%,
                              10/1/04                                 3,389
                                                                 ------------
                                                                      8,298
                                                                 ------------
METALS & MINING--1.1%
                    1,500  Barrick Gold Corp., 7.50%,
                              5/1/07                                  1,580
                                                                 ------------
PACKAGING & CONTAINERS--1.4%
                    2,000  Owens-Illinois Inc., 7.15%,
                              5/15/05                                 1,980
                                                                 ------------
PAPER & FOREST PRODUCTS--0.9%
                    1,350  Abitibi-Consolidated Inc., 7.40%,
                              4/1/18                                  1,306
                                                                 ------------
REAL ESTATE--4.7%
                    1,500  Chelsea GCA Realty Partners,
                              7.25%, 10/21/07                         1,401
                    2,000  Price REIT, Inc. (The), 7.125%,
                              6/15/04                                 2,046
                    3,000  Spieker Properties Inc. MTN,
                              7.58%, 12/17/01                         3,085
                                                                 ------------
                                                                      6,532
                                                                 ------------

Principal Amount               ($ in Thousands)                      Value
- --------------------------------------------------------------------------------

RETAIL (APPAREL)--1.5%
                   $2,000  Saks Inc., 7.25%, 12/1/04               $  2,049
                                                                 ------------
STEEL--1.1%
                    1,600  Pohang Iron & Steel Co., Ltd.,
                              7.375%, 5/15/05                         1,573
                                                                 ------------
TELEPHONE COMMUNICATIONS--7.2%
                    2,000  Cable & Wireless Communications
                              plc, 6.375%, 3/6/03                     2,010
                    1,350  Cable & Wireless Communications
                              plc, 6.625%, 3/6/05                     1,361
                    2,000  GTE North Inc., Series H, 5.65%,
                           11/15/08                                   1,912
                    2,000  MCI WorldCom, Inc., 6.40%,
                              8/15/05                                 2,014
                    2,500  Qwest Communications
                              International Inc., 7.50%,
                              11/1/08 (Acquired
                              10/28/98-11/4/98,
                              Cost $2,499)(2)                         2,626
                                                                 ------------
                                                                      9,923
                                                                 ------------
UTILITIES--5.5%
                    2,000  CINergy Corp., 6.53%, 12/16/08
                              (Acquired 12/10/98,
                              Cost $2,015)(2)                         1,997
                    1,500  Empresa Nacional de Electricidad
                              S.A. (Chile), 8.50%, 4/1/09
                              (Acquired 4/21/99,
                              Cost $1,617)(2)                         1,614
                    2,000  Georgia Power Co., 5.50%,
                              12/1/05                                 1,937
                    2,000  Southern Investments UK, 6.80%,
                              12/1/06                                 2,017
                                                                 ------------
                                                                      7,565
                                                                 ------------
WIRELESS COMMUNICATIONS--2.2%
                    2,500  TCI Communications, Inc., 8.75%,
                              8/1/15                                  3,022
                                                                 ------------
TOTAL CORPORATE BONDS                                                97,742
                                                                 ------------
   (Cost $101,098)

TEMPORARY CASH INVESTMENTS--1.9%
   Repurchase Agreement, BA Security Services,
    Inc. (U.S. Treasury obligations), in a joint
    trading account at 4.80%, dated 4/30/99,
    due 5/3/99 (Delivery value $2,623)                                2,622
                                                                 ------------
   (Cost $2,622)

TOTAL INVESTMENT SECURITIES--100%                                  $138,492
                                                                 ============
   (Cost $138,504)

                                               See Notes to Financial Statements


22      1-800-345-2021


Bond--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

MTN = Medium Term Note

TVA = Tennessee Valley Authority

(1)  Final maturity indicated.  Expected remaining maturity used for purposes of
     calculating the weighted average portfolio maturity.

(2)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value of restricted  securities at April 30, 1999,  was $12,359,
     which represented 8.8% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percentage of investments in each industry, as applicable

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                 www.americancentury.com      23


Statements of Assets and Liabilities
- --------------------------------------------------------------------------------

<TABLE>
APRIL 30, 1999 (UNAUDITED)                            INTERMEDIATE
                                       LIMITED-TERM      -TERM              BOND

ASSETS                                   (In Thousands Except Per-Share Amounts)
Investment securities, at value
  (identified cost of
  $19,936, $33,029 and $138,504,
<S>                                   <C>             <C>              <C>
  respectively) (Note 3) ..........   $      19,997   $      32,987    $     138,492
Cash ..............................            --                44                2
Receivable for investments sold ...            --              --                 19
Interest receivable ...............             287             566            2,502
                                      -------------   -------------    -------------
                                             20,284          33,597          141,015
                                      -------------   -------------    -------------

LIABILITIES
Disbursements in excess of
  demand deposit cash .............            --              --                231
Payable for capital shares redeemed            --              --                127
Accrued management fees (Note 2) ..              11              20               93
Distribution and service fees
  payable (Note 2) ................            --                 2                1
Dividends payable .................               2               3                7
                                      -------------   -------------    -------------
                                                 13              25              459
                                      -------------   -------------    -------------
Net Assets ........................   $      20,271   $      33,572    $     140,556
                                      =============   =============    =============

NET ASSETS CONSIST OF:
Capital (par value and paid
  in surplus) .....................   $      20,203   $      33,540    $     139,877
Accumulated undistributed
  net realized gain
  on investment transactions ......               7              74              691
Net unrealized appreciation
  (depreciation)
  on investments (Note 3) .........              61             (42)             (12)
                                      -------------   -------------    -------------
                                      $      20,271   $      33,572    $     140,556
                                      =============   =============    =============

Investor Class, $0.01 Par Value
  ($ and shares in full)
Net assets ........................   $  19,178,861   $  28,975,251    $ 138,270,159
Shares outstanding ................       1,934,778       2,899,738       14,552,443
Net asset value per share .........   $        9.91   $        9.99    $        9.50

Advisor Class, $0.01 Par Value
 ($ and shares in full)
Net assets ........................   $   1,092,356   $   4,597,038    $   2,286,296
Shares outstanding ................         110,197         460,055          240,616
Net asset value per share .........   $        9.91   $        9.99    $        9.50
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns,  you get the fund's net assets.  For each class of shares,  the net assets
divided  by the total  number of  shares  outstanding  gives you the price of an
individual share, or the net asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment  income not yet paid to  shareholders or net investment  losses;  net
gains earned on investments  but not yet paid to  shareholders  or net losses on
investments (known as realized gains or losses); and finally, gains or losses on
securities  still  owned  by the  fund  (known  as  unrealized  appreciation  or
depreciation).  This  breakdown  tells  you the  value  of net  assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

                                              See Notes to Financial Statements


24      1-800-345-2021


Statements of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED)

                                                         INTERMEDIATE
                                            LIMITED-TERM    -TERM         BOND
INVESTMENT INCOME                                       (In Thousands)
Income:
Interest ................................     $   583      $   978      $ 4,646
                                              -------      -------      -------
Expenses (Note 2):
Management fees .........................          67          114          568
Distribution fees -- Advisor Class ......           1            5            3
Service fees -- Advisor Class ...........           1            5            3
Directors' fees and expenses ............        --           --              1
                                              -------      -------      -------
                                                   69          124          575
                                              -------      -------      -------
Net investment income ...................         514          854        4,071
                                              -------      -------      -------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
(NOTE 3)
Net realized gain on investments ........           7           80          738
Change in net unrealized
  appreciation on investments ...........        (182)        (640)      (4,767)
                                              -------      -------      -------
Net realized and unrealized
  loss on investments ...................        (175)        (560)      (4,029)
                                              -------      -------      -------
Net Increase in Net Assets
  Resulting from Operations .............     $   339      $   294      $    42
                                              =======      =======      =======

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF OPERATIONS--This  statement breaks down how each
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment  gains or losses.It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

See Notes to Financial Statements


                                                 www.americancentury.com      25


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

<TABLE>
SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED) AND YEAR ENDED OCTOBER 31, 1998

Increase (Decrease) in Net Assets         LIMITED-TERM          INTERMEDIATE-TERM                 BOND
                                       1999          1998       1999         1998           1999        1998
OPERATIONS (In Thousands)
<S>                                 <C>          <C>          <C>          <C>          <C>          <C>
Net investment income ...........   $     514    $   1,053    $     854    $   1,365    $   4,071    $   8,072
Net realized gain on
  investments ...................           7           92           80          179          738           47
Change in net unrealized
  appreciation on investments ...        (182)         115         (640)         206       (4,767)         699
                                    ---------    ---------    ---------    ---------    ---------    ---------
Net increase in net assets
  resulting from operations .....         339        1,260          294        1,750           42        8,818
                                    ---------    ---------    ---------    ---------    ---------    ---------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income:
  Investor Class ................        (488)      (1,026)        (755)      (1,219)      (4,009)      (7,993)
  Advisor Class .................         (26)         (27)         (99)        (146)         (62)         (79)
From net realized gains
 on investment transactions:
  Investor Class ................         (87)         (28)        (177)        --            (68)        (368)
  Advisor Class .................          (5)        --            (22)        --             (1)          (1)
                                    ---------    ---------    ---------    ---------    ---------    ---------
Decrease in net assets
  from distributions ............        (606)      (1,081)      (1,053)      (1,365)      (4,140)      (8,441)
                                    ---------    ---------    ---------    ---------    ---------    ---------

CAPITAL SHARE
TRANSACTIONS (NOTE 4)
Net increase (decrease) in
   net assets from capital
  share transactions ............         854        4,236        4,384        9,419       (2,995)      20,229
                                    ---------    ---------    ---------    ---------    ---------    ---------
Net increase (decrease)
   in net assets ................         587        4,415        3,625        9,804       (7,093)      20,606

NET ASSETS
Beginning of period .............      19,684       15,269       29,947       20,143      147,649      127,043
                                    ---------    ---------    ---------    ---------    ---------    ---------
End of period ...................   $  20,271    $  19,684    $  33,572    $  29,947    $ 140,556    $ 147,649
                                    =========    =========    =========    =========    =========    =========
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
each fund's net assets changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* share transactions--shareholders' purchases, reinvestments, and redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

                                              See Notes to Financial Statements


26      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION -- American  Century Mutual Funds,  Inc. (the  corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management   investment   company.   Limited-Term   Bond  Fund   (Limited-Term),
Intermediate-Term  Bond  Fund  (Intermediate-Term),  and Bond Fund  (Bond)  (the
funds) are three of the thirteen series of funds issued by the corporation.  The
funds'  investment  objective  is to seek income by investing in bonds and other
debt obligations.  The funds are authorized to issue two classes of shares:  the
Investor  Class  and  the  Advisor  Class.  The two  classes  of  shares  differ
principally in their respective  shareholder servicing and distribution expenses
and arrangements. All shares of the fund represent an equal pro rata interest in
the assets of the class to which such shares belong,  and have identical voting,
dividend, liquidation and other rights and the same terms and conditions, except
for class specific  expenses and exclusive  rights to vote on matters  affecting
only individual classes.  The following  significant  accounting policies are in
accordance with generally accepted accounting  principles;  these principles may
require the use of estimates by fund management.

     SECURITY VALUATIONS -- Portfolio securities are valued through a commercial
pricing  service or at the mean of the most  recent bid and asked  prices.  When
valuations  are not readily  available,  securities  are valued at fair value as
determined in accordance with procedures adopted by the Board of Directors.

     SECURITY  TRANSACTIONS -- Security transactions are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME -- Interest  income is recorded on the accrual basis and
includes accretion of discounts and amortization of premiums.

     REPURCHASE  AGREEMENTS  -- The funds may enter into  repurchase  agreements
with institutions the funds'  investment  manager,  American Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost. The funds require that the collateral, represented by securities, received
in a  repurchase  transaction  be  transferred  to  the  custodian  in a  manner
sufficient  to enable  the funds to obtain  those  securities  in the event of a
default under the repurchase  agreement.  ACIM monitors,  on a daily basis,  the
securities  transferred to ensure the value,  including accrued interest, of the
securities  under each repurchase  agreement is equal to or greater than amounts
owed to the funds under each repurchase agreement.

     JOINT  TRADING  ACCOUNT -- Pursuant  to an  Exemptive  Order  issued by the
Securities  and  Exchange  Commission,  the funds,  along with other  registered
investment  companies  having  management  agreements  with ACIM,  may  transfer
uninvested  cash  balances  into a joint  trading  account.  These  balances are
invested in one or more repurchase agreements that are collateralized by U.S.
Treasury or Agency obligations.

     INCOME  TAX  STATUS  -- It is the  funds'  policy  to  distribute  all  net
investment  income  and net  realized  gains to  shareholders  and to  otherwise
qualify as a regulated  investment  company  under  provisions  of the  Internal
Revenue  Code.  Accordingly,  no  provision  has been made for  federal or state
income taxes.

     DISTRIBUTIONS TO SHAREHOLDERS -- Distributions  from net investment  income
are declared  daily and  distributed  monthly.  Distributions  from net realized
gains are declared and paid annually.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net gains and losses for financial statement and tax
purposes and may result in reclassification among certain capital accounts.

     ADDITIONAL   INFORMATION   --  Funds   Distributor,   Inc.   (FDI)  is  the
corporation's  distributor.  Certain  officers  of FDI are also  officers of the
corporation.


                                                 www.americancentury.com      27


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

APRIL 30, 1999 (UNAUDITED)

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The  corporation  has entered  into a  Management  Agreement  with ACIM that
provides the funds with investment  advisory and management services in exchange
for a single,  unified  management  fee per class.  Expenses  excluded  from the
agreement  are  brokerage  commissions,   taxes,  interest,  expenses  of  those
directors  who  are  not  considered  "interested  persons"  as  defined  in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses.  The fee is computed daily and paid monthly based on each fund's class
average  daily  closing  net  assets  during  the  previous  month.  The  annual
management fee for the Investor Class of  Limited-Term,  Intermediate-Term,  and
Bond is 0.70%, 0.75% and 0.80%, respectively.  The annual management fee for the
Advisor Class of Limited-Term,  Intermediate-Term  and Bond is 0.45%,  0.50% and
0.55%, respectively.

    The Board of Directors has adopted the Advisor Class Master Distribution and
Shareholder  Services Plan (the plan),  pursuant to Rule 12b-1 of the Investment
Company Act of 1940.  The plan  provides  that the funds will pay ACIM an annual
distribution  fee equal to 0.25% and  service  fee equal to 0.25%.  The fees are
computed  daily and paid  monthly  based on the Advisor  Class's  average  daily
closing net assets  during the previous  month.  The  distribution  fee provides
compensation for distribution  expenses incurred by financial  intermediaries in
connection  with  distributing  shares of the Advisor Class  including,  but not
limited to, payments to brokers,  dealers, and financial  institutions that have
entered into sales  agreements with respect to shares of the funds.  The service
fee provides  compensation for shareholder and administrative  services rendered
by ACIM,  its  affiliates or independent  third party  providers.  Fees incurred
under  the  plan for the six  months  ended  April  30,  1999 for  Limited-Term,
Intermediate-Term and Bond were $2,567, $9,508 and $5,700, respectively.

    Certain  officers and directors of the  corporation are also officers and/or
directors,  and  as  a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the corporation's  investment manager,  ACIM and
the corporation's transfer agent, American Century Services Corporation.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

    Investment  transactions,  excluding  short-term  investments,  for  the six
months ended April 30, 1999, were as follows:

<TABLE>
                                        LIMITED-TERM    INTERMEDIATE-TERM        BOND
PURCHASES                                                (In Thousands)
<S>                                        <C>              <C>                <C>
U.S. Treasury & Agency Obligations ....    $3,113           $ 7,204            $24,902
Other Debt Obligations ................     4,979            14,394             58,572

PROCEEDS FROM SALES                                      (In Thousands)
U.S. Treasury & Agency Obligations ....    $5,227            $9,066            $32,626
Other Debt Obligations ................     3,704             9,060             56,304

    On  April  30,  1999,  the  composition  of  unrealized   appreciation   and
depreciation of investment securities based on the aggregate cost of investments
for federal income tax purposes was as follows:

                                        LIMITED-TERM    INTERMEDIATE-TERM        BOND
                                                          (In Thousands)
Appreciation ..........................     $101              $276              $1,831
Depreciation ..........................     (40)              (324)             (1,889)
                                      ---------------   -----------------   --------------
Net ...................................     $61               $(48)              $(58)
                                      ===============   =================   ==============
Federal Tax Cost ......................   $19,936           $33,035            $138,550
                                      ===============   =================   ==============
</TABLE>


28   1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

APRIL 30, 1999 (UNAUDITED)

- --------------------------------------------------------------------------------
4. CAPITAL SHARE TRANSACTIONS

<TABLE>
    Transactions in shares of the funds were as follows:

                                    LIMITED-TERM         INTERMEDIATE-TERM              BOND
                                SHARES      AMOUNT      SHARES       AMOUNT      SHARES       AMOUNT
INVESTOR CLASS                                             (In Thousands)
<S>                               <C>       <C>          <C>         <C>          <C>         <C>
Shares authorized ............. 150,000                 150,000                  150,000
                               =========               =========                =========
Six months ended
  April 30, 1999
Sold ..........................   246       $2,446       820         $8,271       3,102       $30,028
Issued in reinvestment
  of distributions ............   51          511         83           841         396         3,817
Redeemed ......................  (237)      (2,364)      (621)       (6,267)     (3,839)     (37,040)
                               ---------   ---------   ---------   ----------   ---------   ----------
Net increase (decrease) .......   60         $593         282        $2,845       (341)      $(3,195)
                               =========   =========   =========   ==========   =========   ==========

Year ended
 October 31, 1998
Sold ..........................  1,763      $17,594      1,851       $18,810      8,501       $83,134
Issued in reinvestment
  of distributions ............   100         999         108         1,093        799         7,783
Redeemed ...................... (1,518)    (15,196)     (1,140)     (11,569)     (7,418)     (72,377)
                               ---------   ---------   ---------   ----------   ---------   ----------
Net increase ..................   345       $3,397        819        $8,334       1,882       $18,540
                               =========   =========   =========   ==========   =========   ==========

ADVISOR CLASS                                              (In Thousands)
Shares authorized ............. 50,000                  50,000                   50,000
                               =========               =========                =========
Six months ended
  April 30, 1999
Sold ..........................   35         $349        215         $2,170        80          $774
Issued in reinvestment
  of distributions ............    3          28          11           114          7           62
Redeemed ......................  (12)        (116)       (74)         (745)       (66)         (636)
                               ---------   ---------   ---------   ----------   ---------   ----------
Net increase ..................   26         $261         152        $1,539        21          $200
                               =========   =========   =========   ==========   =========   ==========

Period ended
 October 31, 1998(1)
Sold ..........................   107       $1,072        284        $2,873        279        $2,721
Issued in reinvestment
  of distributions ............    3          26          14           143          8           80
Redeemed ......................  (26)        (259)       (190)       (1,931)      (114)       (1,112)
                               ---------   ---------   ---------   ----------   ---------   ----------
Net increase ..................   84         $839         108        $1,085        173        $1,689
                               =========   =========   =========   ==========   =========   ==========
</TABLE>

(1)  November 1, 1997 through  October 31, 1998 for  Intermediate-Term  and Bond
     and November 12, 1997  (commencement  of sale of the Advisor Class) through
     October 31, 1998 for Limited-Term.


                                                 www.americancentury.com      29


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

- --------------------------------------------------------------------------------
5. BANK LOANS

     Effective  December 18,  1998,  the funds,  along with certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus 0.40%.  The funds may borrow  money for
temporary or emergency purposes to fund shareholder  redemptions.  The funds did
not borrow from the line during the period  December 18, 1998 through  April 30,
1999.

- --------------------------------------------------------------------------------
6. FUND EVENTS

   The following name changes became effective March 1, 1999:

              ==================================================================
               NEW NAME                  FORMER NAME
              ==================================================================
   FUND:       Limited-Term Bond Fund    American Century - Benham Limited-Term
                                         Bond Fund

   FUND:       Intermediate-Term         American Century - Benham
               Bond Fund                 Intermediate-Term Bond Fund

   FUND:       Bond Fund                 American Century - Benham Bond Fund


30      1-800-345-2021


Limited-Term Bond--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                                 Investor Class
                                        1999(1)      1998       1997       1996       1995      1994(2)
PER-SHARE DATA
Net Asset Value,
<S>                                     <C>         <C>        <C>        <C>        <C>        <C>
Beginning of Period ..................  $10.05      $9.98      $9.93      $9.96      $9.68      $10.00
                                      ----------   --------   --------   --------   --------   ----------
Income From Investment Operations
  Net Investment Income ..............   0.26        0.55       0.56       0.56       0.56       0.31
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ..  (0.09)       0.08       0.05      (0.03)      0.28      (0.32)
                                      ----------   --------   --------   --------   --------   ----------
  Total From Investment Operations ...   0.17        0.63       0.61       0.53       0.84      (0.01)
                                      ----------   --------   --------   --------   --------   ----------
Distributions
  From Net Investment Income .........  (0.26)      (0.55)     (0.56)     (0.56)     (0.56)     (0.31)
  From Net Realized Gains on
  Investment Transactions ............  (0.05)      (0.01)       --         --         --         --
                                      ----------   --------   --------   --------   --------   ----------
  Total Distributions ................  (0.31)      (0.56)     (0.56)     (0.56)     (0.56)     (0.31)
                                      ----------   --------   --------   --------   --------   ----------
Net Asset Value, End of Period .......  $9.91       $10.05      $9.98      $9.93      $9.96      $9.68
                                      ==========   ========   ========   ========   ========   ==========
  Total Return(3) ....................   1.72%       6.58%      6.30%      5.48%      8.89%     (0.08)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ................ 0.70%(4)      0.70%      0.69%      0.68%      0.69%     0.70%(4)
Ratio of Net Investment Income
to Average Net Assets ................ 5.32%(4)      5.56%      5.63%      5.63%      5.70%     4.79%(4)
Portfolio Turnover Rate ..............    44%         97%       109%       121%       116%        48%
Net Assets, End of Period
(in thousands) ....................... $19,179      $18,838    $15,269    $8,092     $7,193     $4,375
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) March 1, 1994 (inception) through October 31, 1994.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

See Notes to Financial Statements


                                                 www.americancentury.com      31


Limited-Term Bond--Financial Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)
FOR A SHARE OUTSTANDING THROUGHOUT THE PERIODS INDICATED

                                                    Advisor Class
                                                 1999(1)      1998(2)
PER-SHARE DATA
Net Asset Value, Beginning of Period ..........  $10.05        $9.97
                                               ----------   ----------
Income From Investment Operations
  Net Investment Income .......................   0.25         0.51
  Net Realized and Unrealized Gain
  (Loss) on Investment  Transactions ..........  (0.09)        0.09
                                               ----------   ----------
  Total From Investment Operations ............   0.16         0.60
                                               ----------   ----------
Distributions
  From Net Investment Income ..................  (0.25)       (0.51)
  From Net Realized Gains on
  Investment Transactions .....................  (0.05)       (0.01)
                                               ----------   ----------
  Total Distributions .........................  (0.30)       (0.52)
                                               ----------   ----------
Net Asset Value, End of Period ................   $9.91       $10.05
                                               ==========   ==========
  Total Return(3) .............................   1.60%        6.23%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ......................... 0.95%(4)     0.95%(4)
Ratio of Net Investment Income
to Average Net Assets ......................... 5.07%(4)     5.26%(4)
Portfolio Turnover Rate .......................    44%          97%
Net Assets, End of Period
(in thousands) ................................  $1,092        $845

(1) Six months ended April 30, 1999 (unaudited).

(2) November 12, 1997 (commencement of sale) through October 31, 1998.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

                                              See Notes to Financial Statements


32      1-800-345-2021


Intermediate-Term Bond--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                                Investor Class
                                       1999(1)      1998       1997       1996       1995      1994(2)
PER-SHARE DATA
Net Asset Value,
<S>                                    <C>         <C>        <C>        <C>        <C>        <C>
Beginning of Period .................. $10.24      $10.07     $9.91      $10.07     $9.53      $10.00
                                      ---------   --------   --------   --------   --------   ---------
Income From Investment Operations
  Net Investment Income ..............  0.27        0.58       0.59       0.58       0.59       0.34
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions .. (0.18)       0.17       0.16      (0.06)      0.54      (0.47)
                                      ---------   --------   --------   --------   --------   ---------
  Total From Investment Operations ...  0.09        0.75       0.75       0.52       1.13      (0.13)
                                      ---------   --------   --------   --------   --------   ---------
Distributions
  From Net Investment Income ......... (0.27)      (0.58)     (0.59)     (0.58)     (0.59)     (0.34)
  From Net Realized Gains on
  Investment Transactions ............ (0.07)        --         --       (0.10)       --         --
                                      ---------   --------   --------   --------   --------   ---------
  Total Distributions ................ (0.34)      (0.58)     (0.59)     (0.68)     (0.59)     (0.34)
                                      ---------   --------   --------   --------   --------   ---------
Net Asset Value, End of Period .......  $9.99      $10.24     $10.07      $9.91     $10.07      $9.53
                                      =========   ========   ========   ========   ========   =========
  Total Return(3) ....................  0.87%       7.71%      7.87%      5.36%     12.19%     (1.24)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ................0.75%(4)      0.75%      0.75%      0.74%      0.74%    0.75%(4)
Ratio of Net Investment Income
to Average Net Assets ................5.43%(4)      5.73%      5.99%      5.90%      6.05%    5.23%(4)
Portfolio Turnover Rate ..............   60%         89%        99%        87%       133%        48%
Net Assets, End of Period
(in thousands) .......................$28,975      $26,797    $18,126   $15,626    $12,827     $4,262
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) March 1, 1994 (inception) through October 31, 1994.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

See Notes to Financial Statements


                                                 www.americancentury.com      33


Intermediate-Term Bond--Financial Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                          Advisor Class
                                                1999(1)        1998        1997(2)
PER-SHARE DATA
<S>                                             <C>           <C>           <C>
Net Asset Value, Beginning of Period .........  $10.24        $10.07        $9.96
                                              -----------   ----------   -----------
Income From Investment Operations
  Net Investment Income ......................   0.26          0.56         0.12
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ..........  (0.18)         0.17         0.11
                                              -----------   ----------   -----------
  Total From Investment Operations ...........   0.08          0.73         0.23
                                              -----------   ----------   -----------
Distributions
  From Net Investment Income .................  (0.26)        (0.56)       (0.12)
  From Net Realized Gains on
  Investment Transactions ....................  (0.07)          --           --
                                              -----------   ----------   -----------
  Total Distributions ........................  (0.33)        (0.56)       (0.12)
                                              -----------   ----------   -----------
Net Asset Value, End of Period ...............   $9.99        $10.24       $10.07
                                              ===========   ==========   ===========
  Total Return(3) ............................   0.74%         7.44%        2.33%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ........................ 1.00%(4)        1.00%      1.00%(4)
Ratio of Net Investment Income
to Average Net Assets ........................ 5.18%(4)        5.48%      6.05%(4)
Portfolio Turnover Rate ......................    60%           89%          99%
Net Assets, End of Period
(in thousands) ...............................  $4,597        $3,150       $2,017
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) August 14, 1997 (commencement of sale) through October 31, 1997.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

                                              See Notes to Financial Statements


34      1-800-345-2021


Bond--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                                 Investor Class
                                       1999(1)      1998        1997        1996        1995        1994
PER-SHARE DATA
Net Asset Value,
<S>                                     <C>         <C>         <C>        <C>         <C>         <C>
Beginning of Period ..................  $9.77       $9.73       $9.63      $9.78       $8.91       $10.21
                                      ---------   ---------   ---------   ---------   ---------   ---------
Income From Investment Operations
  Net Investment Income ..............  0.27        0.57        0.60        0.60        0.61        0.58
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions .. (0.27)       0.07        0.19       (0.14)       0.87       (1.12)
                                      ---------   ---------   ---------   ---------   ---------   ---------
  Total From Investment Operations ...   --         0.64        0.79        0.46        1.48       (0.54)
                                      ---------   ---------   ---------   ---------   ---------   ---------
Distributions
  From Net Investment Income ......... (0.27)      (0.57)      (0.60)      (0.60)      (0.61)      (0.58)
  From Net Realized Gains on
  Investment Transactions ............  --(2)      (0.03)      (0.09)      (0.01)        --        (0.18)
                                      ---------   ---------   ---------   ---------   ---------   ---------
  Total Distributions ................ (0.27)      (0.60)      (0.69)      (0.61)      (0.61)      (0.76)
                                      ---------   ---------   ---------   ---------   ---------   ---------
Net Asset Value, End of Period .......  $9.50       $9.77       $9.73       $9.63       $9.78       $8.91
                                      =========   =========   =========   =========   =========   =========
  Total Return(3) ....................  0.08%       6.79%       8.57%       4.91%      17.16%      (5.47)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ................0.80%(4)      0.80%       0.80%       0.79%       0.78%       0.88%
Ratio of Net Investment Income
to Average Net Assets ................5.71%(4)      5.87%       6.25%       6.18%       6.53%       6.07%
Portfolio Turnover Rate ..............   60%         66%         52%        100%        105%         78%
Net Assets, End of Period
(in thousands) .......................$138,270    $145,496    $126,580    $142,567    $149,223    $121,012
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) Per-share amount was less than $0.005.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

See Notes to Financial Statements


                                                 www.americancentury.com      35


Bond--Financial Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)

<TABLE>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                                           Advisor Class
                                                1999(1)          1998      1997(2)
PER-SHARE DATA
<S>                                               <C>           <C>         <C>
Net Asset Value, Beginning of Period ..........   $9.77         $9.73       $9.55
                                               -----------   ----------   ----------
Income From Investment Operations
  Net Investment Income .......................   0.26          0.55        0.13
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ...........  (0.27)         0.07        0.18
                                               -----------   ----------   ----------
  Total From Investment Operations ............  (0.01)         0.62        0.31
                                               -----------   ----------   ----------
Distributions
  From Net Investment Income ..................  (0.26)        (0.55)      (0.13)
  From Net Realized Gains on
  Investment Transactions .....................   --(3)        (0.03)        --
                                               -----------   ----------   ----------
  Total Distributions .........................  (0.26)        (0.58)      (0.13)
                                               -----------   ----------   ----------
Net Asset Value, End of Period ................   $9.50         $9.77       $9.73
                                               ===========   ==========   ==========
  Total Return(4) .............................  (0.05)%        6.52%       3.27%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ......................... 1.05%(5)        1.05%     1.05%(5)
Ratio of Net Investment Income
to Average Net Assets ......................... 5.46%(5)        5.62%     5.92%(5)
Portfolio Turnover Rate .......................    60%           66%         52%
Net Assets, End of Period
(in thousands) ................................  $2,286        $2,141       $462
</TABLE>

(1) Six months ended April 30, 1999 (unaudited).

(2) August 8, 1997 (commencement of sale) through October 31, 1997.

(3) Per-share amount was less than $0.005.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(5) Annualized.

                                              See Notes to Financial Statements


36      1-800-345-2021


Share Class and Retirement Account Information
- --------------------------------------------------------------------------------

SHARE CLASSES

     Two classes of shares are authorized for sale by the funds: Investor Class
and Advisor Class.

      INVESTOR CLASS  shareholders  do not pay any commissions or other fees for
purchase  of fund shares  directly  from  American  Century.  Investors  who buy
Investor  Class  shares  through  a  broker-dealer  may be  required  to pay the
broker-dealer a transaction fee.

      ADVISOR  CLASS shares are sold through  banks,  broker-dealers,  insurance
companies,  and financial advisors.  Advisor Class shares are subject to a 0.50%
Rule 12b-1  service and  distribution  fee. Half of that fee is available to pay
for recordkeeping and administrative  services, and half is available to pay for
distribution  services provided by the financial  intermediary through which the
Advisor Class shares are purchased. The total expense ratio of the Advisor Class
is 0.25% higher than the total expense ratio of the Investor Class.

     Both  classes  of shares  represent  a pro rata  interest  in the funds and
generally have the same rights and preferences.

RETIREMENT ACCOUNT INFORMATION

     As required by law, any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax withheld.  Your written notice is valid from the date of
receipt  at  American  Century.  Even if you plan to roll  over the  amount  you
withdraw to another tax-deferred  account, the withholding rate still applies to
the withdrawn  amount  unless we have received a written  notice not to withhold
federal income tax prior to the withdrawal.

     When you plan to withdraw,  you may make your  election by  completing  our
Exchange/Redemption  form or an IRS Form W-4P. Call American  Century for either
form.  Your  written  election  is valid from the date of  receipt  at  American
Century. You may revoke your election at any time by sending a written notice to
us.

     Remember, even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


                                                 www.americancentury.com      37


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  to long-term  bond funds and including  both taxable and  tax-exempt
funds. Each fund is managed to provide a "pure play" on a specific sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies:

     LIMITED-TERM  BOND  seeks to  provide  interest  income by  investing  in a
diversified portfolio of fixed-income securities.  The fund maintains a weighted
average maturity of five years or less.

     INTERMEDIATE-TERM  BOND seeks to provide  interest income by investing in a
diversified portfolio of fixed-income securities.  The fund maintains a weighted
average maturity of 3-10 years.

     BOND  seeks to  provide  interest  income  by  investing  in a  diversified
portfolio of fixed-income securities.  The fund has no weighted average maturity
limitations, but typically invests in intermediate- and long-term bonds.

COMPARATIVE INDICES

     The indices listed are used in the report for fund performance comparisons.
They are not investment products available for purchase.

     The  MERRILL  LYNCH  1- TO  5-YEAR  GOVERNMENT/CORPORATE  INDEX is an index
composed  of  corporate   and  Treasury   debt  with  an  overall   maturity  of
approximately  three years.  The index consists of  approximately  24% corporate
debt and 76% government  debt. The corporate debt issues are rated BBB or better
by Standard & Poor's.

     The LEHMAN  INTERMEDIATE  GOVERNMENT/CORPORATE  INDEX  includes  the Lehman
Government Index and the Lehman Intermediate Corporate Bond Index, which reflect
the price  fluctuations  of U.S.  Treasury  and  government  agency  securities,
corporate bonds, and Yankee bonds with maturities of 1-10 years.

     The   LEHMAN   AGGREGATE   BOND   INDEX   is   composed   of   the   Lehman
Government/Corporate  Index and the Lehman Mortgage-Backed  Securities Index. It
reflects the price fluctuations of Treasury  securities,  U.S. government agency
securities, corporate bond issues, and mortgage-backed securities.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service that groups funds
according to their investment  objectives.  Rankings are based on average annual
returns for each fund in a given  category for the periods  indicated.  Rankings
are not included for periods less than one year.

     The Lipper categories for the funds are:

     SHORT   INVESTMENT-GRADE   DEBT  FUNDS   (Limited-Term   Bond)--funds  with
dollar-weighted  average  maturities  of five years or less that invest at least
65% of their assets in investment-grade debt.

     INTERMEDIATE  INVESTMENT-GRADE DEBT FUNDS (Intermediate-Term  Bond)-- funds
with  dollar-weighted  average maturities of 5-10 years that invest at least 65%
of their assets in investment-grade debt.

     A-RATED  CORPORATE  DEBT FUNDS  (Bond)--funds  that  invest at least 65% of
their assets in government issues or corporate debt issues rated A or better.

[left margin]

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGERS
     BUD HOOPS
     JEFF HOUSTON
     JOHN WALSH
  CREDIT RESEARCH MANAGER
     GREG AFIESH

CREDIT RATING GUIDELINES

    CREDIT RATINGS ARE ISSUED BY INDEPENDENT RESEARCH COMPANIES SUCH AS STANDARD
& POOR'S AND  MOODY'S.  THEY ARE BASED ON AN  ISSUER'S  FINANCIAL  STRENGTH  AND
ABILITY TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

    SECURITIES RATED AAA, AA, A, OR BBB ARE CONSIDERED "INVESTMENT-GRADE"
SECURITIES, MEANING THEY ARE RELATIVELY SAFE FROM DEFAULT. HERE ARE THE MOST
COMMON CREDIT RATINGS AND THEIR DEFINITIONS:

*   AAA -- EXTREMELY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*   AA -- VERY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*   A -- STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*   BBB -- GOOD ABILITY TO MEET FINANCIAL OBLIGATIONS.

*   BB  --   SECURITIES   THAT  ARE  LESS   VULNERABLE  TO  DEFAULT  THAN  OTHER
    LOWER-QUALITY ISSUES BUT DO NOT QUITE MEET INVESTMENT-GRADE STANDARDS.

    IT'S  IMPORTANT TO NOTE THAT CREDIT RATINGS ARE  SUBJECTIVE,  REFLECTING THE
OPINIONS OF THE RATING AGENCIES; THEY ARE NOT ABSOLUTE STANDARDS OF QUALITY.


38      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 31-36.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate  of the  fund's  rate of  investment  income,  and it may not equal the
fund's  actual  income  distribution  rate,  the income paid to a  shareholder's
account, or the income reported in the fund's financial statements.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES --the number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)  -- a  measure  of  the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio  mature,  weighted by dollar  amount.  The
longer the WAM, the more interest rate  exposure and  sensitivity  the portfolio
has.

* AVERAGE  DURATION  -- another  measure of the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest  and  principal  payments  of the  securities  in a  portfolio.  As the
duration  of a portfolio  increases,  so does the impact of a change in interest
rates on the value of the portfolio.

* EXPENSE RATIO -- the operating expenses of the fund, expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF FIXED-INCOME SECURITIES

* ASSET-BACKED  SECURITIES -- debt securities that represent ownership in a pool
of receivables, such as credit-card debt, auto loans, and commercial mortgages.

* CORPORATE  BONDS -- debt  securities  or  instruments  issued by companies and
corporations. Short-term corporate securities are typically issued to raise cash
and  cover  current  expenses  in  anticipation  of future  revenues;  long-term
corporate  securities are issued to finance  capital  expenditures,  such as new
plant construction or equipment purchases.

*  MORTGAGE-BACKED  SECURITIES -- debt  securities  that represent  ownership in
pools of mortgage  loans.  Most  mortgage-backed  securities  are  structured as
"pass-throughs"--the monthly payments of principal and interest on the mortgages
in the pool are  collected by the bank that is servicing  the  mortgages and are
"passed through" to investors. While the payments of principal and interest are


                                                 www.americancentury.com      39


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

considered  secure (many are backed by government agency  guarantees),  the cash
flow is less certain than in other fixed-income investments.  Mortgages that are
paid off early reduce future interest payments from the pool.

* U.S.  TREASURY  SECURITIES -- debt securities  issued by the U.S. Treasury and
backed by the direct  "full  faith and  credit"  pledge of the U.S.  government.
Treasury  securities  include  bills  (maturing  in one  year  or  less),  notes
(maturing in two to 10 years), and bonds (maturing in more than 10 years).

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

* CAPITAL  PRESERVATION  -- Offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- Offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  Offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- Offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that the fund's category may change over time. Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its objectives,  policies, and risk potential are consistent
with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


40      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[back cover]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 OR 816-444-3485

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUTUAL FUNDS, INC.

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9906                                                    Funds Distributor, Inc.
SH-BKT-16755                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                 APRIL 30, 1999

SEMIANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- -----------------------
HIGH-YIELD

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century


[inside front cover]

AMERICAN CENTURY KEEPS WITH TRADITION
- --------------------------------------------------------------------------------

FOLLOWING BENHAM'S FOOTSTEPS

On March 1, we made it easier for you to do business with us. We simplified  our
organizational  structure by  eliminating  the  venerable  Benham and  Twentieth
Century names, and putting all our funds under American Century. The name change
will not affect your funds' investment  management--the proven Benham investment
philosophy, experienced portfolio management teams, and legacy of innovation and
high-quality performance remain.

CONSISTENT,  SOLID  PERFORMANCE--We'll  continue  to  adhere  to the  investment
practices  that have  helped  our  fixed-income  funds  perform so well over the
years. In 1998,  two-thirds of American Century bond funds beat their peer group
average, according to Lipper, Inc.

CONSISTENT  INVESTMENT  PHILOSOPHY--American  Century  fixed-income  funds  will
continue to offer a "pure play" on their sector of the market, as they did under
Benham.

CONTINUITY  OF THE  MANAGEMENT  TEAM--The  investment  process  is not all  that
remains  the same;  we've  retained  our core team of  experienced  fixed-income
portfolio managers.

    *  Experience--The  more than 35 fixed-income  investment  professionals  at
       American  Century have an average of nine years of investment  management
       experience.

    *  Bigger and better--Since  American Century was formed,  we've doubled the
       size  of the  original  Benham  management  team  in our  Mountain  View,
       California office.

TRADITION OF INNOVATION--Like  Benham before it, American Century is a leader in
fixed-income  fund  innovation.  For example,  we introduced a total of four new
fixed-income  funds  in the  last  three  years,  including  the  first  no-load
inflation-adjusted bond fund.

We continue to run our fixed-income operation from our offices in Mountain View,
California, which is also home to our walk-in Investor Center.

We look forward to continuing to meet your fixed-income  investment needs in the
Benham tradition.

WHAT'S NEW . . .

     We now classify our funds in easy-to-remember categories based on objective
and risk. The four  objective  categories  are:  CAPITAL  PRESERVATION,  INCOME,
GROWTH AND INCOME,  and GROWTH.  The three risk  categories  are:  CONSERVATIVE,
MODERATE,  and AGGRESSIVE.  This new  classification  system makes it easier for
investors to identify which funds are right for them.

     Turn to the  inside  back  cover of this  report to see a list of the funds
classified by objective and risk. For  definitions of the fund  categories,  see
the Glossary.

Past performance is no guarantee of future results.

[left margin]

HIGH-YIELD
(ABHIX)
- ------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     During the six months  ended April 30,  1999,  we  witnessed  a  remarkable
reversal  in the U.S.  bond  market.  When we last  addressed  you in the annual
report for  American  Century  High-Yield,  investors  were  rushing  out of the
high-yield  bond  market  and into the  relative  safety and  liquidity  of U.S.
Treasury  securities.  Investors  were spooked by global  economic and financial
turmoil,  which  motivated  the Federal  Reserve (the U.S.  central bank) to cut
short-term interest rates to bolster the U.S. economy and help stabilize markets
worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor confidence had rebounded. As a result, investors moved out of Treasurys
and into stocks and higher-yielding bonds. While rising interest rates hurt most
U.S. bond returns in the first four months of 1999,  high-yield  corporate bonds
performed well. High-yield bonds benefited from good corporate health and strong
investor demand for high-yielding investments.

     The year also started well for us. We continued to focus on making American
Century easier to do business with and helping  investors  reach their financial
goals. In March, we consolidated  all our funds under the American Century name.
Though we are proud of the  venerable  Twentieth  Century and Benham  names,  we
believe the change makes it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we've  enhanced  our Web site (at  www.americancentury.com).
Among the new  features are daily fund  information--including  return and price
data--market  and  national  news,  and  a  Forms  Center  with  access  to  the
most-requested investor forms and applications.  You can also sign up to receive
fund prospectuses and shareholder reports electronically.

     Finally,  to help  you  better  understand  your  fund,  we sent  you a new
simplified  prospectus  in March.  It  provides  information  you need in clear,
straightforward language.

     We want your  experience  with  American  Century to be  rewarding,  and we
appreciate your continued confidence in us.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer

[right margin]

                 Table of Contents
   Report Highlights ......................................................    2
   Market Perspective .....................................................    3
   Credit Review ..........................................................    4
HIGH-YIELD
   Performance Information ................................................    5
   Management Q&A .........................................................    6
   Schedule of Investments ................................................    8
FINANCIAL STATEMENTS
   Statement of Assets and
      Liabilities .........................................................   11
   Statement of Operations ................................................   12
   Statements of Changes
      in Net Assets .......................................................   13
   Notes to Financial
      Statements ..........................................................   14
   Financial Highlights ...................................................   16
OTHER INFORMATION
   Retirement Account
      Information .........................................................   17
   Background Information
      Investment Philosophy
         and Policies .....................................................   18
      Comparative Indices .................................................   18
      Lipper Rankings .....................................................   18
      Credit Rating
         Guidelines .......................................................   18
      Investment Team
         Leaders ..........................................................   18
   Glossary ...............................................................   19


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   High-yield bonds posted impressive returns during the six months ended April
    30, 1999, outpacing nearly all other types of fixed-income  securities.  The
    DLJ High Yield Bond Index returned a noteworthy 10.04%.

*   Toward the end of 1998, the global economic picture  improved.  That sparked
    increased  interest in  economically  sensitive  securities such as cyclical
    stocks and high-yield bonds.

*   Global  economies  continued  to  stabilize  during the first four months of
    1999. As a result,  "flight-to-quality" demand for Treasury bonds decreased,
    while demand in the high-yield market rose.

*   Signs of inflation began to appear toward the end of the first quarter. That
    caused the  Federal  Reserve to change  its  stance on  short-term  interest
    rates.  Treasury  bond yields rose and prices  fell,  but solid  demand kept
    high-yield bonds from experiencing similar losses.

CREDIT REVIEW

*   Economic  crises in  emerging  markets  caused  the global  default  rate on
    high-yield debt to increase.

*   In the U.S., the economy was largely unfazed by international  developments.
    As a result, domestic credit conditions remained generally sound.

*   With the  economy  firing  on all  cylinders,  corporate  earnings  remained
    favorable,  allowing  companies  to pay their debts and keeping the domestic
    default rate under 3%.

*   The  defaults  that  occurred  were largely a  reflection  of the  increased
    issuance  of  lower-quality  high-yield  bonds--securities  that are  either
    unrated or rated lower than B-minus.

MANAGEMENT Q&A

*   The fund performed very well, outpacing the return of the average high-yield
    fund and reflecting the solid overall performance of the high-yield market.

*   Our low exposure to health care and energy-related bonds and our emphasis on
    telecommunications   bonds  were   contributing   factors  to   High-Yield's
    performance.

*   Although we made a few slight  adjustments,  the portfolio's  average credit
    rating remained steady at B.

*   Although we continue to be impressed by the strength of the U.S. economy,
    there are a number of issues that could spell trouble for the high-yield
    securities market.

*   Given our cautious  outlook,  we plan to position the portfolio  defensively
    for the near term.

[left margin]

                HIGH-YIELD
                  (ABHIX)
TOTAL RETURNS:              AS OF 4/30/99
    6 Months                      11.08%*
    1 Year                         -1.03%
30-DAY SEC YIELD:                   8.06%
INCEPTION DATE:                   9/30/97
NET ASSETS:                 $46.4 million

* Not annualized.

See Total Returns on page 5.
Investment terms are defined in the Glossary on pages 19-20.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, chief investment officer of fixed income

SOLID RETURNS

     High-yield  bonds  posted  impressive  returns  during the six months ended
April 30, 1999, outpacing nearly all other types of fixed-income securities. The
DLJ High Yield Bond Index returned a noteworthy 10.04%. Solid stock market gains
and renewed  investor  enthusiasm  for  domestic  high-yield  bonds were largely
responsible for that performance.

YIELD SPREADS NARROW

     When the period  began,  high-yield  bonds had just  weathered  a difficult
period.  Global  financial  crises in Asia,  Russia,  and Latin America had sent
investors fleeing from high-yield bonds to the perceived safety of U.S. Treasury
bonds.  As a result,  the yield  difference--or  spread--between  Treasurys  and
high-yield bonds was at its widest level since 1991 (see the graph at right).

     However,  the situation  improved in mid-November after the Federal Reserve
cut  short-term  interest  rates three times.  Investors  realized that the U.S.
economy's  eight-year  expansion was still going strong,  so they began to shift
into  economically  sensitive  securities such as cyclical stocks and high-yield
bonds.  This caused the yield spread between  high-yield  bonds and Treasurys to
shrink.

AN UPBEAT OUTLOOK

     That narrowing trend  continued  during the first four months of 1999. Many
of the factors that had caused  investors  to favor  Treasurys  over  high-yield
securities  disappeared.  Domestically,  economic growth  remained  surprisingly
robust, which allowed corporate earnings to stay healthy. In addition, Asian and
Latin American economies began to improve.  Although the devaluation of Brazil's
currency in January briefly  resurrected  concern over global credit conditions,
the effect on the  high-yield  market was  short-lived.  With  global  economies
stabilizing, "flight-to-quality" demand for Treasurys decreased, while demand in
the high-yield market rose.

THE FED SHIFTS ITS STANCE

     Signs of  inflation  began to appear  toward the end of the first  quarter.
Satisfied that global  economies had improved and concerned that economic growth
might be too strong,  the Federal Reserve  changed its policy toward  short-term
interest rates. The Fed adopted a bias toward raising rates to slow the bustling
economy and keep inflation in check.

     Treasury  prices  fell  sharply  and  yields  rose  in  the  wake  of  that
announcement,  but solid demand kept high-yield bonds from experiencing  similar
losses.  By the end of April,  the difference in yield between  high-yield bonds
and Treasurys had declined from 735 basis points (a basis point equals 0.01%) at
the start of the period to 537 basis  points,  much closer to where spreads have
historically been.

[right margin]

"BY THE END OF APRIL,  THE  DIFFERENCE  IN YIELD  BETWEEN  HIGH-YIELD  BONDS AND
TREASURYS  HAD DECLINED  FROM 735 BASIS POINTS AT THE START OF THE PERIOD TO 537
BASIS POINTS, MUCH CLOSER TO WHERE SPREADS HAVE HISTORICALLY BEEN."

[line graph - data below]

HIGH-YIELD/TREASURY YIELD SPREAD

DATE            YIELD SPREAD
4/30/89             517
7/31/89             629
10/31/89            745
1/31/90             774
4/30/90             773
7/31/90             718
10/31/90           1060
1/31/91            1058
4/30/91             772
7/31/91             723
10/31/91            724
1/31/92             589
4/30/92             500
7/31/92             544
10/31/92            583
1/31/93             490
4/30/93             437
7/31/93             400
10/31/93            434
1/31/94             391
4/30/94             393
7/31/94             426
10/31/94            405
1/31/95             444
4/30/95             425
7/31/95             432
10/31/95            454
1/31/96             467
4/30/96             388
7/31/96             388
10/31/96            391
1/31/97             336
4/30/97             343
7/31/97             329
10/31/97            361
1/31/98             366
4/30/98             357
7/31/98             400
10/31/98            735
1/31/99             626
4/30/99             537

In Basis Points (a basis point equals 0.01%)
This chart shows the yield difference,  or spread,  between the bonds in the DLJ
High Yield Index and 10-year Treasury securities.

Source: Donaldson, Lufkin & Jenrette


                                                  www.americancentury.com      3


Credit Review
- --------------------------------------------------------------------------------

GLOBAL DEFAULT RATES ROSE

     In  spite of a solid  performance  by the U.S.  high-yield  market,  credit
conditions  worldwide took a turn for the worse.  According to Moody's Investors
Service Inc.,  the global  default rate on high-yield  debt rose to 3.8% for the
year ended April 30, 1999, up from 3.4% in 1998 and 2% in 1997.

     Much of that increase can be attributed  to problems  surrounding  emerging
markets, which suffered last year amid a series of global crises that threatened
to choke off  economic  growth.  To avoid the  potential  problems  presented by
emerging-market bonds, High-Yield's portfolio remained concentrated in U.S.
holdings.

HEALTHY DOMESTIC GROWTH

     In the U.S., the economy was largely unfazed by international  developments
during the six months ended April 30. As a result,  domestic  credit  conditions
remained generally sound.  Buoyed by three short-term  interest rate cuts by the
Federal  Reserve,  a  historically  low  unemployment  rate,  and solid consumer
spending, the economy expanded at a surprisingly brisk 6% annual pace during the
final three months of 1998 and a robust 4.1% annual clip in the first quarter of
1999.

     With the  economy  firing on all  cylinders,  corporate  earnings  remained
favorable,  allowing  companies  to pay their  debts and  keeping  the  domestic
default rate under 3%.

LOWER-QUALITY ISSUERS STRUGGLED

     The defaults  that  occurred in the U.S.  were largely a reflection  of the
increased issuance of lower-quality high-yield bonds--securities that are either
unrated or rated lower than B-minus.

     In recent years, renewed investor enthusiasm for high-yield bonds brought a
surge of supply from small,  lower-rated companies.  In the past, such companies
were forced to seek financing  through  venture  capital or other means.  By the
late 1990s,  however,  solid U.S. economic growth and increased  investor demand
made it  increasingly  easy for such  companies  to issue  unrated or  extremely
low-quality bonds.

     In fact,  over a quarter of the high-yield  securities  issued in 1998 were
unrated or rated lower than  B-minus,  the  highest  level since the late 1980s.
When these  low-rated  companies fail to meet their business  plans,  it is more
difficult  for them to go back to the  high-yield  market  for  financing.  As a
result, defaults among these riskier, lower-rated issuers increased.

CREDIT RESEARCH TEAM

     We're proud to report that we've so far  maintained  a track record of zero
defaults for High-Yield's portfolio. We believe that's largely the result of our
credit-intensive  approach  to  security  selection--similar  to the one used by
value  stock  managers--where  we try to provide the best  combination  of total
return and risk. To do that, we rely on a team of seasoned credit analysts,  who
we  believe  are able to find  attractive  securities  in  complex  areas of the
market.

[left margin]

"WITH THE ECONOMY FIRING ON ALL CYLINDERS, CORPORATE EARNINGS REMAINED
FAVORABLE, ALLOWING COMPANIES TO PAY THEIR DEBTS AND KEEPING THE DOMESTIC
DEFAULT RATE UNDER 3%."

HIGH-YIELD CREDIT ANALYSIS TEAM
     MICHAEL DIFLEY
     LYNDA LOWRY


4      1-800-345-2021


High-Yield--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF APRIL 30, 1999

                                 DLJ HIGH YIELD    HIGH CURRENT YIELD FUNDS(2)
                     HIGH-YIELD      INDEX       AVERAGE RETURN   FUND'S RANKING
6 MONTHS(1) .........  11.08%        10.04%          10.17%             --
1 YEAR ..............  -1.03%         1.18%          -0.03%       172 OUT OF 269
===============================================================================
AVERAGE ANNUAL RETURNS
===============================================================================
LIFE OF FUND ........   3.84%         4.37%           3.16%       117 OUT OF 225

The fund's inception date was 9/30/97.

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 18-19 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

PERFORMANCE OF $10,000 OVER LIFE OF FUND
Value on 4/30/99
DLJ High Yield Index      $10,699
High-Yield                $10,615

                   High-Yield      DLJ High Yield Index
DATE                 VALUE               VALUE
9/30/97             $10,000             $10,000
10/31/97             $9,963              $9,987
11/30/97            $10,044             $10,073
12/31/97            $10,174             $10,173
1/31/98             $10,437             $10,330
2/28/98             $10,491             $10,412
3/31/98             $10,667             $10,529
4/30/98             $10,718             $10,574
5/31/98             $10,729             $10,583
6/30/98             $10,717             $10,595
7/31/98             $10,781             $10,678
8/31/98             $10,097              $9,953
9/30/98              $9,947              $9,929
10/31/98             $9,548              $9,723
11/30/98            $10,144             $10,269
12/31/98            $10,044             $10,228
1/31/99             $10,210             $10,368
2/28/99             $10,209             $10,313
3/31/99             $10,409             $10,452
4/30/99             $10,615             $10,699

$10,000 investment made 9/30/97

The graph at left shows the performance of a $10,000 investment over the life of
the fund.  The DLJ High Yield Index is  provided  for  comparison.  High-Yield's
total  return  includes  operating  expenses  (such  as  transaction  costs  and
management  fees) that reduce returns,  while the total return of the index does
not. Past performance does not guarantee future results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

PORTFOLIO AT A GLANCE
                             4/30/99           10/31/98
NUMBER OF SECURITIES           85                65
WEIGHTED AVERAGE
   MATURITY                  7.4 YRS           7.0 YRS
AVERAGE DURATION             4.8 YRS           5.5 YRS
EXPENSE RATIO                0.90%*             0.90%

YIELD AS OF APRIL 30, 1999
   30-DAY SEC YIELD          8.06%

* Annualized.

Investment terms are defined in the Glossary on pages 19-20.


                                                  www.americancentury.com      5


High-Yield--Q&A
- --------------------------------------------------------------------------------
/photo of Theresa Fennell/

     An interview with Theresa  Fennell,  a portfolio  manager on the High-Yield
fund investment team.

HOW DID HIGH-YIELD PERFORM DURING THE SIX MONTHS ENDED APRIL 30, 1999?

     The  fund  performed  very  well,  outpacing  the  return  of  the  average
high-yield  fund and reflecting the solid overall  performance of the high-yield
market. For the six months,  High-Yield returned 11.08%.  That's better than the
10.04% gain of the DLJ High Yield Index and the 10.17% average return of the 304
"High  Current  Yield Funds"  tracked by Lipper Inc.  (See the previous page for
other performance comparisons.)

WHAT LED TO HIGH-YIELD'S SOLID  PERFORMANCE?

     Our low exposure to health care and  energy-related  bonds and our emphasis
on telecommunications  bonds were contributing factors. Nursing homes across the
nation  have come  under  competitive  pressure  to cut costs  because  of lower
Medicare reimbursements. We largely avoided these bonds, which performed poorly.

     Energy issues also struggled. Crude oil prices fell to a 12-year low toward
the end of 1998 amid increased OPEC  production and shrinking  demand from Asian
economies.  In  addition,  a  relatively  mild winter in the Western  Hemisphere
reduced  energy  demand.  The overall  result was a  lackluster  performance  by
energy-related  bonds,  although that performance improved toward the end of the
six months thanks to production cuts by OPEC that boosted oil prices.

     Our continued emphasis on telecommunications bonds also helped performance.
Telecommunications companies rebounded sharply during the first quarter of 1999,
benefiting  from many of the same factors  that have fueled the  sector's  solid
performance in recent  years--deregulation,  merger  activity,  and the Internet
Revolution.

BESIDES TELECOMMUNICATIONS, WERE  THERE ANY OTHER AREAS OF THE MARKET  THAT YOU
FAVORED?

     Yes, we also liked  broadcasting  and media  issues.  Cable  operators  are
starting to make serious  inroads toward  providing  digital  lines.  Over time,
cable companies aim to give consumers an overall package that includes Internet,
phone, and video hookups.

     Those steps would allow the cable  operators to compete with  regional Bell
phone  companies,  which are developing their own packages.  In this sector,  we
liked Avalon Cable Television, Charter Communications, and NTL Inc. in the U.K.

[left margin]

"ALTHOUGH WE MADE A FEW SLIGHT ADJUSTMENTS, THE PORTFOLIO'S AVERAGE CREDIT
RATING REMAINED STEADY AT B."

PORTFOLIO COMPOSITION BY
CREDIT RATING
                   % OF FUND INVESTMENTS
                   AS OF            AS OF
                  4/30/99          10/31/98
AAA                 5%                8%
BB                 17%               13%
B                  59%               67%
CCC                 4%                1%
UNRATED            15%               11%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 18
for more information.


6      1-800-345-2021


High-Yield--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WHAT ABOUT HIGH-YIELD'S OVERALL  CREDIT QUALITY?

     Although a few slight adjustments were made, the portfolio's average credit
rating remained steady at B. We added a slight credit barbell,  which means that
we put a small portion of assets in  high-quality,  cash-equivalent  investments
and some in low-quality securities rated CCC.

     The short-term  cash position  provided two benefits:  (1) it allowed us to
add attractively  priced securities when they became available while meeting the
fund's periodic  liquidity  needs,  and (2) it cushioned the fund against market
volatility.  On the opposite end of the investment  spectrum,  the lower-quality
securities  that we added to the  portfolio  enhanced the fund's yield and total
return.

     Adding the credit  barbell  also  caused a slight  reduction  in the fund's
duration (a measure of the  portfolio's  sensitivity  to interest rate changes),
which fell from 5.5 years at the end of  October  '98 to 4.8 years at the end of
April.

LOOKING FORWARD, WHAT DO YOU SEE IN STORE FOR THE HIGH-YIELD BOND MARKET?

     Although we continue to be impressed  by the strength of the U.S.  economy,
there  are a number  of issues  that  could  spell  trouble  for the  high-yield
securities market.

     The potential for inflation to accelerate is one concern.  Overall consumer
prices rose 0.7% in April,  the largest  monthly  increase in nearly nine years.
About half of the increase was attributed to soaring gasoline  prices;  however,
every other  component  of the consumer  price index also rose.  Even though one
month's figures don't make a trend, they do raise some concerns going forward.

     Another concern is the potential computer problems associated with the year
2000. If investors  begin to feel uneasy about the outlook for global  economies
to safely weather the event,  "flight-to-quality" demand for the relative safety
and  liquidity  of  U.S.  Treasury  bonds  could  resurface  at the  expense  of
lower-quality debt such as high-yield bonds.

     We also  believe  that the slight  increase  in  domestic  defaults  in the
high-yield market bears watching.

     Of  course,  there's  always a chance  that  inflation  will  remain  tame,
Treasury  yields will remain in a range close to current  levels,  and the yield
difference  between  high-yield   securities  and  Treasurys  will  continue  to
decrease; we just don't think that's the most likely scenario.

WHAT ARE YOUR PLANS FOR THE PORTFOLIO?

     Given our cautious outlook,  we plan to position the portfolio  defensively
until we're convinced that some of the  unfavorable  factors we've outlined have
worked themselves out of the market. For now, we will probably maintain a fairly
large position in telecommunications  bonds, which represent the largest portion
of the high-yield market. We also intend to keep the fund's duration  relatively
neutral  compared  with our Lipper peers and will  probably keep a slight credit
barbell on the fund.

[right margin]

"ALTHOUGH WE CONTINUE TO BE IMPRESSED BY THE STRENGTH OF THE U.S. ECONOMY, THERE
ARE A NUMBER OF ISSUES THAT COULD SPELL TROUBLE FOR THE HIGH-YIELD SECURITIES
MARKET."

TOP FIVE INDUSTRIES (AS OF 4/30/99)
                                    % OF FUND INVESTMENTS
TELEPHONE COMMUNICATIONS                   13.5%
BUSINESS SERVICES & SUPPLIES                9.9%
BROADCASTING & MEDIA                        6.9%
COMPUTER SOFTWARE & SERVICES                6.5%
WIRELESS COMMUNICATIONS                     5.8%

TOP FIVE INDUSTRIES (AS OF 10/31/98)
                                    % OF FUND INVESTMENTS
TELEPHONE COMMUNICATIONS                   11.5%
WIRELESS COMMUNICATIONS                     8.8%
ENERGY (PRODUCTION &
   MARKETING)                               8.2%
MACHINERY & EQUIPMENT                       6.8%
PAPER & FOREST PRODUCTS                     6.2%


                                                  www.americancentury.com      7


High-Yield--Schedule of Investments
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

Principal Amount                                                         Value
- --------------------------------------------------------------------------------
CORPORATE BONDS--91.2%
AUTOMOBILES & AUTO PARTS--0.5%
              $   250,000  Dura Operating Corp., 9.00%,
                              5/1/09 (Acquired 4/15/99,
                              Cost $250,000)(1)                      $   255,625
                                                                   -------------
BANKING--2.8%
                  750,000  Bay View Capital Corp., 9.125%,
                              8/15/02                                    714,375
                  790,000  Ocwen Capital Trust I, 10.875%,
                              8/1/27                                     612,250
                                                                   -------------
                                                                       1,326,625
                                                                   -------------
BROADCASTING & MEDIA--6.9%
                  250,000  Avalon Cable of Michigan, 9.375%,
                              12/1/08 (Acquired 12/4/98,
                              Cost $250,000)(1)                          265,625
                1,000,000  Charter Communication Holdings
                              LLC, 9.92%, 4/1/11 (Acquired
                              3/12/99, Cost $613,940)(1)(2)              660,000
                  750,000  Imax Corp., 7.875%, 12/1/05                   748,125
                  500,000  Intermedia Capital Partners,
                              11.25%, 8/1/06                             565,000
                  500,000  Intl. Cabletel Inc., 11.50%,
                              2/1/06(2)                                  440,625
                  750,000  RCN Corp., 11.125%,
                              10/15/07(2)                                523,125
                                                                   -------------
                                                                       3,202,500
                                                                   -------------
BUSINESS SERVICES & SUPPLIES--9.9%
                  500,000  Diamond Triumph Auto, 9.25%,
                              4/1/08 (Acquired
                              3/25/98-11/9/98, Cost
                              $498,125)(1)                               505,000
                  500,000  Donnelly (R.H.) Corp., 9.125%,
                              6/1/08                                     531,875
                  500,000  Group Maintenance America,
                              9.75%, 1/15/09 (Acquired
                              1/19/99, Cost $500,000)(1)                 511,250
                  500,000  Integrated Electric Services,
                              9.375%, 2/1/09 (Acquired
                              1/25/99, Cost $496,000)(1)                 507,500
                  500,000  Intertek Finance PLC, Series B,
                              10.25%, 11/1/06                            496,250
                  500,000  NationsRents, Inc., 10.375%,
                              12/15/08                                   522,500
                  500,000  Unicco Service/Finance,
                              Series B, 9.875%, 10/15/07                 501,250
                1,000,000  United Rentals, Inc., Series B,
                              9.50%, 6/1/08                            1,025,000
                                                                   -------------
                                                                       4,600,625
                                                                   -------------
CHEMICALS & RESINS--3.9%
                  500,000  Borden Chemicals & Plastics
                              Limited Partnership, 9.50%,
                              5/1/05                                     505,000

Principal Amount                                                         Value
- --------------------------------------------------------------------------------

              $   500,000  Octel Developments PLC,
                              10.00%, 5/1/06                         $   524,375
                  750,000  Scotts Company, 8.675%,
                              1/15/09 (Acquired 1/14/99,
                              Cost $750,000)(1)                          780,000
                                                                   -------------
                                                                       1,809,375
                                                                   -------------
COMMUNICATIONS EQUIPMENT--0.8%
                  500,000  Telehub Communications Corp.,
                              13.875%, 7/31/05(2)                        360,000
                                                                   -------------
COMPUTER SOFTWARE & SERVICES--5.8%
                1,000,000  ICG Services Inc., 10.00%,
                              2/15/08(2)                                 635,000
                  500,000  PSINet Inc., Series B, 10.00%,
                              2/15/05 (Acquired 4/15/99,
                              Cost $535,000)(1)                          525,000
                1,000,000  Rhythms NetConnections,
                              12.75%, 4/15/09 (Acquired
                              4/16/99, Cost $1,000,000)(1)             1,000,000
                  500,000  Verio Inc., 10.375%, 4/1/05                   536,250
                                                                   -------------
                                                                       2,696,250
                                                                   -------------
CONSTRUCTION & PROPERTY
DEVELOPMENT--2.1%
                1,000,000  Toll Corp., 8.00%, 5/1/09                   1,000,000
                                                                   -------------
ELECTRICAL & ELECTRONIC
COMPONENTS--3.9%
                  500,000  Flextronics Intl. Ltd., Series B,
                              8.75%, 10/15/07                            520,000
                  250,000  International Utility Structures Inc.,
                              10.75%, 2/1/08                             256,250
                  500,000  MCMS, Inc., Series B, 9.75%,
                              3/1/08                                     310,000
                  750,000  Trench Electric & Trench Inc.,
                              10.25%, 12/15/07                           723,750
                                                                   -------------
                                                                       1,810,000
                                                                   -------------
ENERGY (PRODUCTION &
MARKETING)--3.8%
                  320,000  Belco Oil & Gas Corp., Series B,
                              10.50%, 4/1/06                             331,200
                  500,000  Ocean Energy, Inc., Series B,
                              8.875%, 7/15/07                            516,250
                  500,000  Range Resources Corp., 8.75%,
                              1/15/07                                    420,000
                  500,000  Snyder Oil Corp., 8.75%,
                              6/15/07                                    506,250
                                                                   -------------
                                                                       1,773,700
                                                                   -------------
ENERGY (SERVICES)--1.1%
                  250,000  Trico Marine Services, Inc.,
                              Series G, 8.50%, 8/1/05                    220,625
                  500,000  Universal Compression Inc.,
                              9.875%, 2/15/08(2)                         315,000
                                                                   -------------
                                                                         535,625
                                                                   -------------

                                              See Notes to Financial Statements


8      1-800-345-2021


High-Yield--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount                                                         Value
- --------------------------------------------------------------------------------

ENVIRONMENTAL SERVICES--1.2%
               $1,000,000  Envirosource, Inc., 9.75%,
                              6/15/03                                $   580,000
                                                                   -------------
FINANCIAL SERVICES--3.5%
                  750,000  AMRESCO, INC., Series 1998 A,
                              9.875%, 3/15/05                            615,000
                  750,000  Metris Companies Inc., 10.00%,
                              11/1/04                                    772,500
                  500,000  Nationwide Credit, Inc., Series A,
                              10.25%, 1/15/08                            267,500
                                                                   -------------
                                                                       1,655,000
                                                                   -------------
HEALTHCARE--0.5%
                  250,000  Magellan Health Services, 9.00%,
                              2/15/08                                    211,250
                                                                   -------------
INDUSTRIAL--1.7%
                  750,000  Park-Ohio Industries, Inc., 9.25%,
                              12/1/07                                    776,250
                                                                   -------------
LEISURE--5.3%
                  500,000  Circus Circus Enterprises, Inc.,
                              7.625%, 7/15/13                            476,250
                1,000,000  Isle of Capri Casinos, Inc., 8.75%,
                              4/15/09 (Acquired 4/20/99,
                              cost $1,000,000)(1)                        997,500
                  500,000  Park Place Entertainment, 7.875%,
                              12/15/05                                   493,750
                  500,000  SFX Entertainment, Inc., 9.125%,
                              12/1/08 (Acquired 4/28/99,
                              Cost $517,500)(1)                          518,750
                                                                   -------------
                                                                       2,486,250
                                                                   -------------
MACHINERY & EQUIPMENT--1.0%
                  500,000  Key Components, Inc., 10.50%,
                              6/1/08                                     481,250
                                                                   -------------
METALS & MINING--1.1%
                  500,000  Golden Northwest Aluminum,
                              12.00%, 12/15/06 (Acquired
                              12/14/98, Cost $500,000)(1)                516,250
                                                                   -------------
PACKAGING & CONTAINERS--2.2%
                  750,000  Graham Packaging Co., Series B,
                              10.75%, 1/15/09(2)                         525,000
                  500,000  Stone Container, 10.75%, 10/1/02              523,750
                                                                   -------------
                                                                       1,048,750
                                                                   -------------
PAPER & FOREST PRODUCTS--4.8%
                  750,000  Ainsworth Lumber Co. Ltd., PIK,
                              12.50%, 7/15/07                            834,375
                  500,000  Gaylord Container Corp., Series B,
                              9.75%, 6/15/07                             482,500
                  500,000  Grupo Industrial Durango, S.A. de
                              C.V., 12.625%, 8/1/03                      507,500
                  500,000  Repap New Brunswick, 10.625%,
                              4/15/05                                    415,000
                                                                   -------------
                                                                       2,239,375
                                                                   -------------

Principal Amount                                                         Value
- --------------------------------------------------------------------------------

RESTAURANTS--1.1%
              $   500,000  Apple South Inc., 9.75%, 6/1/06           $   502,500
                                                                   -------------
RETAIL (GENERAL MERCHANDISE)--1.1%
                  500,000  Tuesday Morning Corp., Series B,
                              11.00%, 12/15/07                           532,500
                                                                   -------------
RETAIL (SPECIALTY)--3.2%
                  500,000  Musicland Group, 9.00%,
                              6/15/03                                    505,000
                1,000,000  Sonic Automotive, Inc., Series B,
                              11.00%, 8/1/08                             997,500
                                                                   -------------
                                                                       1,502,500
                                                                   -------------
STEEL--1.1%
                  500,000  California Steel Industries, 8.50%,
                              4/1/09 (Acquired 3/31/99,
                              Cost $500,000)(1)                          512,500
                                                                   -------------
TELEPHONE COMMUNICATIONS--12.2%
                  750,000  21st Century Telecom Group,
                              12.25%, 2/15/08(2)                         352,500
                1,000,000  Allegiance Telecom Inc., Series B,
                              11.75%, 2/15/08(2)                         673,750
                1,000,000  DTI Holdings Inc., Series B,
                              12.50%, 3/1/08(2)                          390,000
                  500,000  Global Crossing Holdings Ltd.,
                              9.625%, 5/15/08                            560,000
                1,000,000  GST USA, Inc., 10.59%,
                              12/15/05(2)                                840,000
                  750,000  IDT Corp., 8.75%, 2/15/06                     765,000
                  250,000  Intermedia Communications Inc.,
                              9.56%, 7/15/02(2)                          189,375
                  250,000  Intermedia Communications Inc.,
                              9.50%, 3/1/09 (Acquired
                              2/19/99, Cost $248,878)(1)                 260,000
                  500,000  Jazztel PLC, 14.00%, 4/1/09
                              (Acquired 3/31/99, Cost
                              $500,000)(1)                               511,250
                  250,000  Microcell Telecommunications Inc.,
                              12.52%, 6/1/06(2)                          211,875
                  500,000  Qwest Communications
                              International Inc., Series B,
                              7.44%, 2/1/03(2)                           401,250
                  500,000  RSL Communications PLC,
                              10.50%, 11/15/08                           522,500
                                                                   -------------
                                                                       5,677,500
                                                                   -------------
TEXTILES & APPAREL--2.2%
                  500,000  Delta Mills, Inc., Series B, 9.625%,
                              9/1/07                                     503,750
                  500,000  Supreme International Corp.,
                              12.25%, 4/1/06 (Acquired
                              3/31/99, Cost $494,260)(1)                 507,500
                                                                   -------------
                                                                       1,011,250
                                                                   -------------
TRANSPORTATION--1.7%
                  750,000  Atlas Air, Inc., 10.75%, 8/1/05               789,375
                                                                   -------------

See Notes to Financial Statements


                                                  www.americancentury.com      9


High-Yield--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

Principal Amount/Shares                                                  Value
- --------------------------------------------------------------------------------
WIRELESS COMMUNICATIONS--5.8%
              $   250,000  Metrocall, Inc., 10.375%,
                              10/1/07                                $   216,875
                1,000,000  NEXTEL Communications, Inc.,
                              10.11%, 8/15/04(2)                       1,045,000
                  750,000  Orange plc, 8.00%, 8/1/08                     772,500
                  500,000  Paging Network, Inc., 10.00%,
                              10/15/08                                   410,000
                  500,000  Telesystem International Wireless
                              Inc., Series C, 10.50%,
                              11/1/07(2)                                 275,000
                                                                   -------------
                                                                       2,719,375
                                                                   -------------
TOTAL CORPORATE BONDS                                                 42,612,200
                                                                   -------------
   (Cost $43,830,711)

PREFERRED STOCKS & WARRANTS--2.0%
COMPUTER SOFTWARE & SERVICES--0.7%
                      282  Concentric Network Corp., PIK,
                              13.50%                                     320,775
                                                                   -------------

Principal Amount/Shares                                                  Value
- --------------------------------------------------------------------------------
TELEPHONE COMMUNICATIONS--1.3%
                    1,000  Allegiance Telecom Inc. Warrants          $    38,126
                    5,000  DTI Holdings Inc. Warrants                        600
                    5,000  Global Crossing Holdings Ltd.,
                              PIK, 10.50%                                581,250
                                                                   -------------
                                                                         619,976
                                                                   -------------
TOTAL PREFERRED STOCKS & WARRANTS                                        940,751
                                                                   -------------
   (Cost $738,562)

TEMPORARY CASH INVESTMENTS--6.8%
              $  864,000   FHLB Discount Notes, 4.90%,
                              5/3/99(3)                                  864,000
   Repurchse Agreement, BA Security Services,
       Inc., (U.S. Treasury obligations), in a joint
       trading account at 4.80%, dated 4/30/99,
       due 5/3/99 (Delivery value $2,300,920)                          2,300,000
                                                                   -------------
TOTAL TEMPORARY CASH INVESTMENTS                                       3,164,000
                                                                   -------------
   (Cost $3,163,765)

TOTAL INVESTMENT SECURITIES--100.0%                                  $46,716,951
                                                                   =============
   (Cost $47,733,038)

NOTES TO SCHEDULE OF INVESTMENTS

PIK =  Payment  in  Kind.  Coupon  payments  may be in the  form  of  additional
securities.

FHLB = Federal Home Loan Bank

(1)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate value of restricted securities at April 30, 1999, was $8,833,750,
     which  represented  19.0%  of net  assets.  None of  these  securities  are
     considered to be illiquid.

(2)  Step-coupon  security.  Yield to maturity at purchase is  indicated.  These
     securities become interest bearing at a predetermined  rate and future date
     and are purchased at a substantial discount from their value at maturity.

(3) Rate disclosed is the yield to maturity at purchase.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments the fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal (dollar) amount of each bond or the number of shares of each
  stock

* the market value of each investment

* the percentage of total investments in each industry

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------
APRIL 30, 1999 (UNAUDITED)

ASSETS
Investment securities, at value
  (identified cost of $47,733,038)
  (Note 3) ..............................................         $  46,716,951
Interest receivable .....................................               893,655
                                                                  -------------
                                                                     47,610,606
                                                                  -------------

LIABILITIES
Disbursements in excess
  of demand deposit cash ................................                88,149
Payable for investments purchased .......................             1,042,920
Accrued management fees (Note 2) ........................                34,002
Dividends payable .......................................                 4,405
Other liabilities .......................................                    84
                                                                  -------------
                                                                      1,169,560
                                                                  -------------
Net Assets ..............................................         $  46,441,046
                                                                  =============

CAPITAL SHARES, $0.01 PAR VALUE
Authorized -- Investor Class ............................           200,000,000
                                                                  =============
Outstanding -- Investor Class ...........................             5,006,630
                                                                  =============
Net Asset Value Per Share ...............................         $        9.28
                                                                  =============

NET ASSETS CONSIST OF:
Capital (par value and paid in surplus) .................         $  48,832,008
Accumulated net realized loss on
  investment transactions ...............................            (1,374,875)
Net unrealized depreciation
  on investments (Note 3) ...............................            (1,016,087)
                                                                  -------------
                                                                  $  46,441,046
                                                                  =============

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
gains earned but not yet paid out to  shareholders  or net losses on  investment
activity (known as realized gains or losses);  and gains or losses on securities
still owned by the fund (known as unrealized appreciation or depreciation). This
breakdown tells you the value of net assets that are  performance-related,  such
as investment gains or losses,  and the value of net assets that are not related
to performance, such as shareholder investments and redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statement of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED)

INVESTMENT INCOME
Income:
Interest .................................................          $ 1,922,886
                                                                    -----------
Expenses (Note 2):
Management fees ..........................................              180,257
Directors' fees and expenses .............................                  146
                                                                    -----------
                                                                        180,403
                                                                    -----------
Net investment income ....................................            1,742,483
                                                                    -----------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS (NOTE 3)
Net realized loss on investments .........................           (1,368,217)
Change in net unrealized
  depreciation on investments ............................            3,774,763
                                                                    -----------
Net realized and unrealized
  gain on investments ....................................            2,406,546
                                                                    -----------
Net Increase in Net Assets
  Resulting from Operations ..............................          $ 4,149,029
                                                                    ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


12      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED) AND YEAR ENDED OCTOBER 31, 1998

Increase in Net Assets:                               1999              1998

OPERATIONS
Net investment income ......................     $  1,742,483      $  2,291,261
Net realized gain (loss) on investments ....       (1,368,217)           29,979
Change in net unrealized
  depreciation on investments ..............        3,774,763        (4,679,178)
                                                 ------------      ------------
Net increase (decrease) in net assets
  resulting from operations ................        4,149,029        (2,357,938)
                                                 ------------      ------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .................       (1,742,483)       (2,291,261)
From net realized gains on
  investment transactions ..................          (36,637)             --
                                                 ------------      ------------
Decrease in net assets
  from distributions .......................       (1,779,120)       (2,291,261)
                                                 ------------      ------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ..................       37,903,694        59,205,875
Proceeds from reinvestment
  of distributions .........................        1,432,925         1,965,445
Payments for shares redeemed ...............      (27,494,415)      (35,365,180)
                                                 ------------      ------------
Net increase in net assets
  from capital share transactions ..........       11,842,204        25,806,140
                                                 ------------      ------------
Net increase in net assets .................       14,212,113        21,156,941

NET ASSETS
Beginning of period ........................       32,228,933        11,071,992
                                                 ------------      ------------
End of period ..............................     $ 46,441,046      $ 32,228,933
                                                 ============      ============

TRANSACTIONS IN SHARES
OF THE FUND
Sold .......................................        4,169,558         5,938,245
Issued in reinvestment of distributions ....          156,757           200,982
Redeemed ...................................       (3,012,015)       (3,564,707)
                                                 ------------      ------------
Net increase ...............................        1,314,300         2,574,520
                                                 ============      ============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--This  statement shows how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* share transactions--shareholders' purchases, reinvestments, and redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------

APRIL 30, 1999 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Organization -- American  Century Mutual Funds,  Inc. (the  corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management investment company. High-Yield Fund (the fund) is one of the thirteen
series of funds issued by the corporation. The fund's investment objective is to
seek  high  current   income  by  investing  in  a   diversified   portfolio  of
high-yielding  corporate bonds, debentures and notes. The fund invests primarily
in  lower-rated  debt  securities,  which are subject to greater credit risk and
consequently  offer  higher  yield.  Securities  of this  type  are  subject  to
substantial risks including price  volatility,  liquidity risk and default risk.
The fund is  authorized to issue two classes of shares:  the Investor  Class and
the  Advisor  Class.  The two  classes  of shares  differ  principally  in their
respective shareholder servicing and distribution expenses and arrangements. All
shares of the fund  represent  an equal pro rata  interest  in the assets of the
class  to  which  such  shares  belong,  and have  identical  voting,  dividend,
liquidation and other rights and the same terms and conditions, except for class
specific  expenses  and  exclusive  rights  to vote on  matters  affecting  only
individual classes. Sale of the Advisor Class had not commenced as of the report
date.  The following  significant  accounting  policies are in  accordance  with
generally accepted accounting  principles;  these principles may require the use
of estimates by fund management.

     Security Valuations -- Portfolio securities are valued through a commercial
pricing  service or at the mean of the most  recent bid and asked  prices.  When
valuations  are not readily  available,  securities  are valued at fair value as
determined in accordance with procedures adopted by the Board of Directors.

     Security  Transactions -- Security transactions are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     Investment  Income -- Interest  income is recorded on the accrual basis and
includes accretion of discounts and amortization of premiums.

     Repurchase Agreements -- The fund may enter into repurchase agreements with
institutions that the fund's  investment  manager,  American Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost. The fund requires that the collateral, represented by securities, received
in a  repurchase  transaction  be  transferred  to  the  custodian  in a  manner
sufficient  to enable  the fund to  obtain  those  securities  in the event of a
default under the repurchase  agreement.  ACIM monitors,  on a daily basis,  the
securities  transferred to ensure the value,  including accrued interest, of the
securities  under each repurchase  agreement is equal to or greater than amounts
owed to the fund under each repurchase agreement.

     Joint  Trading  Account -- Pursuant  to an  Exemptive  Order  issued by the
Securities  and  Exchange  Commission,  the fund,  along with  other  registered
investment  companies  having  management  agreements  with ACIM,  may  transfer
uninvested  cash  balances  into a joint  trading  account.  These  balances are
invested in one or more repurchase agreements that are collateralized by U.S.
Treasury or Agency obligations.

     Income  Tax  Status  -- It is the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  gains to  shareholders  and to  otherwise
qualify as a regulated  investment  company under the provisions of the Internal
Revenue  Code.  Accordingly,  no  provision  has been made for  federal or state
income taxes.

     Distributions to Shareholders -- Distributions  from net investment  income
are declared  daily and  distributed  monthly.  Distributions  from net realized
gains are declared and paid annually.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net gains and losses for financial statement and tax
purposes and may result in reclassification among certain capital accounts.

     Additional   Information   --  Funds   Distributor,   Inc.   (FDI)  is  the
corporation's  distributor.  Certain  officers  of FDI are also  officers of the
corporation.


14      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
APRIL 30, 1999 (UNAUDITED)

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The  corporation  has entered  into a Management  Agreement  with ACIM that
provides the fund with investment  advisory and management  services in exchange
for a single,  unified management fee per class. The Agreement provides that all
expenses of the fund, except brokerage commissions, taxes, interest, expenses of
those  directors who are not considered  "interested  persons" as defined in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses, will by paid by ACIM. The fee is computed daily and paid monthly based
on the fund's class average  closing net assets during the previous  month.  The
annual management fee for the Investor Class is 0.90%.

     The Board of Directors  adopted the Advisor Class Master  Distribution  and
Shareholder  Services Plan (the plan),  pursuant to Rule 12b-1 of the Investment
Company  Act of 1940.  The plan  provides  that the fund will pay ACIM an annual
distribution  fee equal to 0.25% and  service  fee equal to 0.25%.  The fees are
computed  daily and paid  monthly  based on the Advisor  Class's  average  daily
closing net assets  during the previous  month.  The  distribution  fee provides
compensation for distribution  expenses incurred by financial  intermediaries in
connection  with  distributing  shares of the Advisor Class  including,  but not
limited to, payments to brokers,  dealers, and financial  institutions that have
entered into sales  agreements  with respect to shares of the fund.  The service
fee provides  compensation for shareholder and administrative  services rendered
by ACIM, its affiliates or independent third party providers.

     Certain  officers and directors of the corporation are also officers and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the corporation's  investment manager, ACIM, and
the corporation's transfer agent, American Century Services Corporation.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

     Purchases and sales of securities,  excluding short-term investments,  were
$24,008,003 and $11,861,760, respectively.

     As  of  April  30,  1999,  accumulated  net  unrealized   depreciation  was
$1,022,012,  based on the aggregate cost of  investments  for federal income tax
purposes  of  $47,738,963,   which  consisted  of  unrealized   appreciation  of
$1,102,534 and unrealized depreciation of $2,124,546.

- --------------------------------------------------------------------------------
4. BANK LOANS

     Effective  December 18,  1998,  the fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus  0.40%.  The fund may borrow  money for
temporary or emergency  purposes to fund shareholder  redemptions.  The fund did
not borrow from the line during the period  December 18, 1998 through  April 30,
1999.

- --------------------------------------------------------------------------------
5. FUND EVENTS

   The following name change became effective March 1, 1999:

              ==================================================================
               NEW NAME                  FORMER NAME
              ==================================================================

   Fund:       High-Yield Fund           American Century - Benham
                                         High-Yield Fund


                                                 www.americancentury.com      15


High-Yield--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                           1999(1)        1998        1997(2)
PER-SHARE DATA
Net Asset Value, Beginning of Period ...$     8.73    $     9.91   $    10.00
                                        ----------    ----------   ----------
Income From Investment Operations
  Net Investment Income ................      0.40          0.83         0.06
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ....      0.56         (1.18)       (0.09)
                                        ----------    ----------   ----------
Total From Investment Operations .......      0.96         (0.35)       (0.03)
                                        ----------    ----------   ----------
Distributions
  From Net Investment Income ...........     (0.40)        (0.83)       (0.06)
  From Net Realized Gains on
  Investment Transactions ..............     (0.01)         --           --
                                        ----------    ----------   ----------
  Total Distributions ..................     (0.41)        (0.83)       (0.06)
                                        ----------    ----------   ----------
Net Asset Value, End of Period .........$     9.28    $     8.73   $     9.91
                                        ==========    ==========   ==========
  Total Return(3) ......................     11.08%        (4.09)%      (0.27)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..................      0.90%(4)      0.90%       0.90%(4)
Ratio of Net Investment Income
to Average Net Assets ..................      8.70%(4)      8.41%       7.39%(4)
Portfolio Turnover Rate ................        33%           85%        --
Net Assets, End of Period
(in thousands) .........................$   46,441    $   32,229   $   11,072

(1) Six months ended April 30, 1999 (unaudited).

(2) September 30, 1997 (inception) through October 31, 1997.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years (or less, if the fund is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* distributions of income and capital gains paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced

                                              See Notes to Financial Statements


16      1-800-345-2021


Retirement Account Information
- --------------------------------------------------------------------------------

RETIREMENT ACCOUNT INFORMATION

     As required by law, any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax withheld.  Your written notice is valid from the date of
receipt  at  American  Century.  Even if you plan to roll  over the  amount  you
withdraw to another tax-deferred  account, the withholding rate still applies to
the withdrawn  amount  unless we have received a written  notice not to withhold
federal income tax prior to the withdrawal.

     When you plan to withdraw,  you may make your  election by  completing  our
Exchange/Redemption  form or an IRS Form W-4P. Call American  Century for either
form.  Your  written  election  is valid from the date of  receipt  at  American
Century. You may revoke your election at any time by sending a written notice to
us.

     Remember, even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


                                                 www.americancentury.com      17


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  to long-term  bond funds and including  both taxable and  tax-exempt
funds. Each fund is managed to provide a "pure play" on a specific sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies

     American  Century  High-Yield  seeks to  provide a high  level of  interest
income by investing in a  diversified  portfolio of  high-yielding  fixed-income
securities.  As a secondary objective, the fund seeks capital appreciation.  The
fund invests  primarily in lower-quality  corporate  bonds,  with an emphasis on
securities rated BB or B. The fund has no average maturity  limitations,  but it
typically invests in intermediate- and long-term bonds.

     Lower-rated  bonds may be subject to greater default risk,  liquidity risk,
and price volatility.

COMPARATIVE INDICES

     The  index  listed  below  is  used  in the  report  for  fund  performance
comparisons. It is not an investment product available for purchase.

     The DLJ High Yield  Index is a broad index of  corporate  bonds with credit
ratings below investment grade. The index has an average maturity of 8 years and
an average credit rating of BB/B.

LIPPER RANKINGS

     Lipper Inc. is an independent mutual fund ranking service that groups funds
according to their investment objectives. Rankings are based on average annual
returns for each fund in a given category for the periods indicated. Rankings
are not included for periods less than one year. The Lipper category for
High-Yield is:

     High  Current  Yield  Funds -- funds  that aim at high  current  yield from
fixed-income  securities.  No quality or  maturity  restrictions;  funds tend to
invest in lower-grade debt issues.

CREDIT RATING GUIDELINES

     Credit  ratings  are  issued  by  independent  research  companies  such as
Standard  & Poor's  and  Moody's.  Ratings  are based on an  issuer's  financial
strength and ability to pay interest and principal in a timely manner.

     Securities  rated  AAA,  AA,  A, or BBB are  considered  "investment-grade"
securities,  meaning they are relatively safe from default.  The High-Yield fund
generally invests in securities that are below investment grade, including those
with the following credit ratings:

     BB  --  securities   that  are  less   vulnerable  to  default  than  other
lower-quality issues but do not quite meet investment-grade standards.

     B  --  securities  that  are  more  vulnerable  to  default  than  BB-rated
securities but whose issuers are currently able to meet their obligations.

     CCC --  securities  that  are  currently  vulnerable  to  default  and  are
dependent on favorable  economic or business  conditions for the issuers to meet
their obligations.

     It's important to note that credit ratings are  subjective,  reflecting the
opinions of the rating agencies; they are not absolute standards of quality.

[left margin]

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGER
     THERESA FENNELL
  HIGH-YIELD ANALYSTS
     MICHAEL DIFLEY
     LYNDA LOWRY


18      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* Total  Return  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* Average Annual Returns  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 16.

YIELDS

* 30-Day SEC Yield  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate  of the  fund's  rate of  investment  income,  and it may not equal the
fund's  actual  income  distribution  rate,  the income paid to a  shareholder's
account, or the income reported in the fund's financial statements.

PORTFOLIO STATISTICS

* Number of Securities--the number of different securities held by the fund on a
given date.

*  Weighted  Average  Maturity  (WAM)  -- a  measure  of  the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio  mature,  weighted by dollar  amount.  The
longer the WAM, the more interest rate  exposure and  sensitivity  the portfolio
has.

* Average  Duration  -- another  measure of the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest  and  principal  payments  of the  securities  in a  portfolio.  As the
duration  of a portfolio  increases,  so does the impact of a change in interest
rates on the value of the portfolio.

* Expense Ratio -- the operating expenses of the fund, expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF FIXED-INCOME SECURITIES

* Corporate  Bonds -- debt  securities  or  instruments  issued by companies and
corporations. Short-term corporate securities are typically issued to raise cash
and cover  current  expenses in  anticipation  of future  revenues;  longer-term
corporate  securities are issued to finance  capital  expenditures,  such as new
plant construction or equipment purchases.

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

* Capital  Preservation  -- Offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.


                                                 www.americancentury.com      19


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

* Income -- Offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* Growth & Income --  Offers  funds  that  emphasize  both  growth  and  income,
diversification,  varying  capitalization sizes, and different investment styles
and strategies.

* Growth -- Offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that the fund's category may change over time. Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its objectives,  policies, and risk potential are consistent
with your needs.

*  Conservative  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* Moderate -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  Aggressive  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


20      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[back cover]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 OR 816-444-3485

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUTUAL FUNDS, INC.

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9906                                                    Funds Distributor, Inc.
SH-BKT-16756                      (c)1999 American Century Services Corporation


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