ONE GROUP
N-30D, 1998-03-03
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<PAGE>   1

                                                                      The One(R)
                                                                        Investor
                                                                     Program(SM)
                                                              Semi-Annual Report
                                      For the six months ended December 31, 1997

                                              The One Group Investor Growth Fund


                                     The One Group Investor Growth & Income Fund


                                            The One Group Investor Balanced Fund


                                 The One Group Investor Conservative Growth Fund


                                     [THE ONE GROUP FAMILY OF MUTUAL FUNDS LOGO]
<PAGE>   2

           ----------------------------------------------------------

              Important Customer Information. Investment Products:

              * are not deposits or obligations of, or guaranteed by,
                BANC ONE CORPORATION or any of its affiliates,
               
              * are not insured by the FDIC, and
                                                                         ----
              * are subject to investment risks, including possible      FDIC
                loss of the principal amount invested.                   LOGO
                                                                         ----
           -----------------------------------------------------------

<PAGE>   3
 
- --------------------------------------------------------------------------------
Table of Contents
- --------------------------------------------------------------------------------
THE ONE GROUP FAMILY OF MUTUAL FUNDS                           DECEMBER 31, 1997
 
Report From Your Investment Advisor........................................    2
Portfolio Performance Review...............................................    4
Schedules of Portfolio Investments..........................................   6
Statements of Assets and Liabilities.......................................   10
Statements of Operations...................................................   11
Statements of Changes in Net Assets........................................   12
Notes to Financial Statements..............................................   14
Financial Highlights.......................................................   20
 
                                                                               1
<PAGE>   4
 
- --------------------------------------------------------------------------------
Report From Your Investment Advisor
- --------------------------------------------------------------------------------
THE ONE GROUP FAMILY OF MUTUAL FUNDS                           DECEMBER 31, 1997
 
We are pleased to present this semiannual report for The One Group(R) Family of
Mutual Funds. On the following pages, you will find an overview of the financial
markets and your fund's performance for the period from July 1, 1997, through
December 31, 1997.
 
DEAR VALUED SHAREHOLDER:
Thank you for continuing to support The One Group Family of Mutual Funds during
an interesting, challenging and ultimately rewarding year for investors.
 
Despite strong volatility throughout 1997 and turmoil in Asia, the Dow Jones
Industrial Average was up 24.94% for 1997. Never before had the index returned
more than 20% for three consecutive years. The S&P 500 Index soared even higher,
closing the year up 33.36%.
 
At the same time, and largely the result of low inflation, a strong U.S. dollar
and the flight to quality spurred by the Asian crisis, U.S. bond yields ended
the year on an impressive note. The 30-year Treasury, for example, ended the
year yielding 5.92%, close to its 20-year low. (As bond yields fall, bond prices
go up.)
 
ONCE AGAIN, A PHILOSOPHY REINFORCED
While the calendar-year returns for both the stock and bond markets are
impressive, events in the final six months of 1997 may be the most memorable. On
August 6, the Dow closed at 8,259, a record high and its peak for the calendar
year. Shortly thereafter, though, volatility rocked the market, as the effects
of the Asian financial crisis worked their way west. These forces culminated on
Monday, October 27, when the Dow plummeted more than 554 points, its
largest-ever point decline.
 
This drop may be the defining moment for 1997's financial markets, and it
presented a significant challenge for investors. But, rather than panicking,
shareholders of The One Group demonstrated a clear understanding of market
dynamics and the importance of maintaining a long-term investment philosophy.
 
I am pleased to report that there were no significant redemptions of One Group
shares after "Black Monday." To us, this implies that our investors understand
the potential dangers of selling their investments based on short-term
volatility. In fact, The One Group experienced a record purchase day on Tuesday,
October 28, indicating that investors realize the benefits of staying focused on
the stock market's long-term potential.
 
TAX BILL CHANGES FACE OF INVESTING
The second half of 1997 may be remembered as much for the jubilance it brought
investors as for the turmoil. The Taxpayer Relief Act of 1997 became law,
ushering in lower capital gains taxes for investors and new investment
opportunities poised to change the face of investing for years to come.
 
The cut in the capital gains tax rate may make investing in stocks even more
attractive for many investors. As you are planning for your future financial
needs and taking into consideration your appropriate asset allocation, please do
not overlook the impact of the new tax treatment of capital gains.
 
And, while you're planning for your financial future, take note that the 1997
tax law makes investing in IRAs even more attractive, particularly with the
introduction of the Roth IRA, a new type of account that offers tax-exempt
distributions in retirement. In addition, the Traditional IRA has been enhanced
with many new features.
 
The One Group can help you incorporate any of these retirement accounts into
your investment plan. Speak to your investment representative or call
1-800-480-4111 for more information on IRAs.
 
SEEK ADVICE FOR A YEAR'S WORTH OF EVENTS
With 1997's record volatility and the new investment opportunities introduced by
the tax law, now may be an ideal time to meet with your investment professional
and make sure your investment plan remains on track to meet your financial
needs.
 
As you probably know, your asset allocation--or the way your investment dollars
are strategically distributed among stock, bond and cash investments according
to your goals, risk tolerance and investing time frame--may be the
single-greatest determinant of your long-term investment success. After a year
full of market ups and downs, your asset allocation probably shifted. For
example, stock market appreciation may have caused your allocation to equities
to swing higher than called for in your plan. Your investment professional can
help you evaluate your plan and, if necessary, get it back on track.
 
   2
<PAGE>   5
 
- --------------------------------------------------------------------------------
Report From Your Investment Advisor, continued
- --------------------------------------------------------------------------------
THE ONE GROUP FAMILY OF MUTUAL FUNDS                           DECEMBER 31, 1997
 
Furthermore, your investment representative can help you make the most of the
Taxpayer Relief Act of 1997. Many of the provisions take effect with the 1998
tax year, so make sure you start off the year with the strategy that's most
appropriate for you.
 
Thank you for investing with The One Group Family of Mutual Funds and for your
ongoing support of the firm's time-tested investment philosophies. We look
forward to helping you achieve your financial goals in 1998 and beyond.
 
Sincerely,
 
LOGO
David J. Kundert
President and CEO,
Banc One Investment Advisors Corporation,
Investment Advisor to The One Group
 
David J. Kundert photo
 
For a prospectus with more complete information on The One Group Investor Funds,
including management fees and expenses, please contact The One Group at
1-800-480-4111. Please read the prospectus carefully before investing.
(2/98)
 
                                                                               3
<PAGE>   6
 
                          The One Group Investor Funds
Portfolio Performance Review
- --------------------------------------------------------------------------------
THE ONE GROUP FAMILY OF MUTUAL FUNDS                           DECEMBER 31, 1997
 
ECONOMIC GROWTH REMAINS STRONG
Despite showing a slight slowdown from the first half of the year, U.S. economic
growth during the second half of 1997 remained robust at a growth rate of 3.7%.
For the entire 12-month period, the U.S. economy grew by a 3.8% growth rate.
 
Firm employment gains and strong consumer confidence fueled the growth rate. The
unemployment rate headed steadily downward, ending the year at 4.7%. The economy
witnessed an average of 301,500 new non-farm jobs being created per month, when
all that is needed to absorb the growth in the labor force and keep the
unemployment rate steady is 150,000.
 
LONG-TERM INTEREST RATES DECLINE
Slightly higher inflation in 1996 kept long-term interest rates relatively high
throughout much of 1997. With prices climbing 3.3% on a year-over-year basis in
1996, investors feared that inflation would keep that pace or even climb higher
in 1997.
 
But, as the year unfolded it became apparent that inflation was, indeed, under
control. For the final six months of the year the inflation rate was 2.0%, and
for the entire year prices were up only 1.7%, the best performance in 11 years.
 
Low prices helped pave the way for a significant decline in long-term interest
rates by the end of the year. Also significant was the impact of the Asian
financial crisis, which caused currency values to plunge and sent financial
markets into turmoil. As worldwide events unfolded during the second half of the
year, it became clear that the Asian economies would weaken. This caused
investors throughout the world to turn to the safety of U.S. Treasury
securities, which helped drive up prices.
 
As a result of these events, long-term interest rates showed a significant
decline during the second half of 1997--a decline that was much greater than the
economic fundamentals supported. At the end of the year, the yield on the
30-year U.S. Treasury bond was 5.92%, after starting the year at 6.64% and
climbing to a high of 7.17% in early April.
 
FED REMAINS IDLE
The Federal Reserve remained on the sidelines during the second half of the
year, after raising interest rates just once in all of 1997--a 0.25% increase of
the federal funds rate in March. This lack of monetary policy action kept
short-term interest rates relatively steady for the remainder of the year.
 
The impact of the Asian currency crisis and market meltdowns may have
contributed to the Fed's decision to keep rates unchanged in the second half of
1997. While strong economic growth certainly created a valid reason for another
rate hike, the Fed resisted the temptation, figuring that the Asian situation
would contribute to slower growth ahead.
 
LOOKING AHEAD
In terms of U.S. economic growth, the Asian crisis remains a factor that can't
be ignored. Thirty percent of U.S. exports go to Asia, and with many Asian
countries facing currency devaluations of 35% to 80%, consumers in that region
have significantly less purchasing power. Furthermore, there's the possibility
that this currency crisis could spread to Latin America, where another 20% of
U.S. exports are at risk if there are some currency devaluations.
 
The United States accounts for 28% of the non-Asian global economy, and,
therefore, should be heavily influenced by the change in trade flows from Asia.
Asian stock markets have dropped nearly 70% over the last several months, which
undoubtedly will be reflected in lower overall consumption, particularly for
foreign imports. And, as prices on goods produced in Asia continue to fall, U.S.
imports from that region should go up.
 
As a result, cheaper goods coming from Asia, and possibly Latin America, should
force domestic competitors to lower their prices (or face sharply lower sales
prospects). This could push the U.S. inflation rate to as low as 1.5% in 1998,
compared to 1.7% in 1997 and 3.3% in 1996. At the same time, fewer U.S. exports
and greater imports should cause economic growth to slow to a 2% year-over-year
average for 1998.
 
   4
<PAGE>   7
                          The One Group Investor Funds
Portfolio Performance Review, continued
- --------------------------------------------------------------------------------
THE ONE GROUP FAMILY OF MUTUAL FUNDS                           DECEMBER 31, 1997
 
Given all the instability overseas and the impending effects of a slowdown in
the U.S. economy, we believe that the Federal Reserve will lower interest rates
in 1998, probably sometime in the second half of the year. Long-term interest
rates should continue their downward trend, due to lower inflation and lower
economic growth. By the end of the year, we may see the yield on the 30-year
Treasury bond somewhere between 5.5% and 5.75%.
 
/s/ Anthony Chan
Anthony Chan, Ph.D.
Managing Director and Chief Economist
Banc One Investment Advisors
 
                                                                               5
<PAGE>   8
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
Investor Growth Fund
- --------------------------------------------------------------------------------
SCHEDULE OF PORTFOLIO INVESTMENTS                              DECEMBER 31, 1997
(Amounts in Thousands)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES (99.3%):
    971     The One Group Disciplined Value Fund
            Fiduciary Class.......................  $ 15,607
    424     The One Group Government Bond Fund
            Fiduciary Class.......................     4,245
    746     The One Group Growth Opportunities
            Fund Fiduciary Class..................    14,499
    443     The One Group Income Bond Fund
            Fiduciary Class.......................     4,198
    209     The One Group Intermediate Bond Fund
            Fiduciary Class.......................     2,106
    620     The One Group International Equity
            Index Fund Fiduciary Class............     9,436
    785     The One Group Large Company Growth
            Fund Fiduciary Class..................    14,324
</TABLE>
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES, CONTINUED:
    982     The One Group Large Company Value Fund
            Fiduciary Class.......................  $ 14,913
    200     The One Group Limited Volatility Fund
            Fiduciary Class.......................     2,096
  1,055     The One Group Prime Money Market Fund
            Fiduciary Class.......................     1,055
    327     The One Group Small Capitalization
            Fund Fiduciary Class..................     3,708
  1,453     The One Group Value Growth Fund
            Fiduciary Class.......................    16,785
                                                    --------
                        Total Investment Companies   102,972
                                                    --------
                         Total (Cost $100,844) (a)  $102,972
                                                    ========
</TABLE>
 
- ------------
 
Percentages indicated are based on net assets of $103,689.
 
(a) Represents cost for financial reporting purposes and differs from value by
    net unrealized appreciation of securities as follows (amounts in thousands):
 
<TABLE>
                   <S>                                            <C>
                   Unrealized appreciation......................  $4,298
                   Unrealized depreciation......................  (2,170)
                                                                  ------
                   Net unrealized appreciation..................  $2,128
                                                                  ======
</TABLE>
 
See notes to financial statements.
 
   6
<PAGE>   9
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
Investor Growth & Income Fund
- --------------------------------------------------------------------------------
SCHEDULE OF PORTFOLIO INVESTMENTS                              DECEMBER 31, 1997
(Amounts in Thousands)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES (98.7%):
    947     The One Group Disciplined Value Fund
            Fiduciary Class.......................  $ 15,222
  1,293     The One Group Government Bond Fund
            Fiduciary Class.......................    12,942
    728     The One Group Growth Opportunities
            Fund Fiduciary Class..................    14,146
  1,350     The One Group Income Bond Fund
            Fiduciary Class.......................    12,798
    766     The One Group Intermediate Bond Fund
            Fiduciary Class.......................     7,703
    588     The One Group International Equity
            Index Fund Fiduciary Class............     8,962
    820     The One Group Large Company Growth
            Fund Fiduciary Class..................    14,963
</TABLE>
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES, CONTINUED:
  1,026     The One Group Large Company Value Fund
            Fiduciary Class.......................  $ 15,582
    488     The One Group Limited Volatility Fund
            Fiduciary Class.......................     5,112
  1,286     The One Group Prime Money Market Fund
            Fiduciary Class.......................     1,286
    260     The One Group Ultra Short-Term Income
            Fund Fiduciary Class..................     2,573
  1,329     The One Group Value Growth Fund
            Fiduciary Class.......................    15,349
                                                    --------
                        Total Investment Companies   126,638
                                                    --------
                         Total (Cost $124,375) (a)  $126,638
                                                    ========
</TABLE>
 
- ------------
 
Percentages indicated are based on net assets of $128,253.
 
(a) Represents cost for financial reporting purposes and differs from value by
    net unrealized appreciation of securities as follows (amounts in thousands):
 
<TABLE>
                   <S>                                            <C>
                   Unrealized appreciation......................  $4,144
                   Unrealized depreciation......................  (1,881)
                                                                  ------
                   Net unrealized appreciation..................  $2,263
                                                                  ======
</TABLE>
 
See notes to financial statements.
 
                                                                               7
<PAGE>   10
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
Investor Conservative Growth Fund
- --------------------------------------------------------------------------------
SCHEDULE OF PORTFOLIO INVESTMENTS                              DECEMBER 31, 1997
(Amounts in Thousands)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES (98.0%):
     51     The One Group Disciplined Value Fund
            Fiduciary Class.......................  $    819
  1,044     The One Group Government Bond Fund
            Fiduciary Class.......................    10,447
     39     The One Group Growth Opportunities
            Fund Fiduciary Class..................       761
    915     The One Group Income Bond Fund
            Fiduciary Class.......................     8,678
     79     The One Group Income Equity Fund
            Fiduciary Class.......................     1,688
    536     The One Group Intermediate Bond Fund
            Fiduciary Class.......................     5,389
    108     The One Group International Equity
            Index Fund Fiduciary Class............     1,651
    110     The One Group Large Company Growth
            Fund Fiduciary Class..................     2,014
</TABLE>
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES, CONTINUED:
    138     The One Group Large Company Value Fund
            Fiduciary Class.......................  $  2,097
    315     The One Group Limited Volatility Fund
            Fiduciary Class.......................     3,301
    831     The One Group Prime Money Market Fund
            Fiduciary Class.......................       831
    168     The One Group Ultra Short-Term Income
            Fund Fiduciary Class..................     1,662
    179     The One Group Value Growth Fund
            Fiduciary Class.......................     2,065
                                                    --------
                        Total Investment Companies    41,403
                                                    --------
                          Total (Cost $41,030) (a)  $ 41,403
                                                    ========
</TABLE>
 
- ------------
 
Percentages indicated are based on net assets of $42,260.
 
(a) Represents cost for financial reporting purposes and differs from value by
    net unrealized appreciation of securities as follows (amounts in thousands):
 
<TABLE>
                   <S>                                            <C>
                   Unrealized appreciation......................  $  693
                   Unrealized depreciation......................    (320)
                                                                  ------
                   Net unrealized appreciation..................  $  373
                                                                  ======
</TABLE>
 
See notes to financial statements.
 
   8
<PAGE>   11
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
Investor Balanced Fund
- --------------------------------------------------------------------------------
SCHEDULE OF PORTFOLIO INVESTMENTS                              DECEMBER 31, 1997
(Amounts in Thousands)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES (98.5%):
    527     The One Group Disciplined Value Fund
            Fiduciary Class.......................  $  8,477
  2,098     The One Group Government Bond Fund
            Fiduciary Class.......................    20,997
    405     The One Group Growth Opportunities
            Fund Fiduciary Class..................     7,877
  2,062     The One Group Income Bond Fund
            Fiduciary Class.......................    19,544
  1,096     The One Group Intermediate Bond Fund
            Fiduciary Class.......................    11,029
    401     The One Group International Equity
            Index Fund Fiduciary Class............     6,107
    588     The One Group Large Company Growth
            Fund Fiduciary Class..................    10,717
</TABLE>
 
<TABLE>
<CAPTION>
                                                     MARKET
 SHARES              SECURITY DESCRIPTION            VALUE
- ---------   --------------------------------------  --------
<C>         <S>                                     <C>
INVESTMENT COMPANIES, CONTINUED:
    735     The One Group Large Company Value Fund
            Fiduciary Class.......................  $ 11,158
    698     The One Group Limited Volatility Fund
            Fiduciary Class.......................     7,319
      0     The One Group Prime Money Market Fund
            Fiduciary Class (b)...................         0
    497     The One Group Ultra Short-Term Income
            Fund Fiduciary Class..................     4,912
  1,057     The One Group Value Growth Fund
            Fiduciary Class.......................    12,212
                                                    --------
                        Total Investment Companies   120,349
                                                    --------
                         Total (Cost $116,543) (a)  $120,349
                                                    ========
</TABLE>
 
- ------------
 
Percentages indicated are based on net assets of $122,241.
 
(a) Represents cost for financial reporting purposes and differs from value by
    net unrealized appreciation of securities as follows (amounts in thousands):
 
<TABLE>
                   <S>                                            <C>
                   Unrealized appreciation......................  $4,825
                   Unrealized depreciation......................  (1,019)
                                                                  ------
                   Net unrealized appreciation..................  $3,806
                                                                  ======
</TABLE>
 
(b) Rounds to less than 1,000.
 
See notes to financial statements.
 
                                                                               9
<PAGE>   12
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
STATEMENTS OF ASSETS AND LIABILITIES                           DECEMBER 31, 1997
(Amounts in Thousands, except per share amounts)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                                                        INVESTOR
                                                       INVESTOR     INVESTOR GROWTH   CONSERVATIVE     INVESTOR
                                                      GROWTH FUND    & INCOME FUND    GROWTH FUND    BALANCED FUND
                                                      -----------   ---------------   ------------   -------------
<S>                                                   <C>           <C>               <C>            <C>
ASSETS:
Investments, at value (cost $100,844; $124,375;
  $41,030; and $116,543; respectively)..............   $102,972        $126,638         $ 41,403       $120,349
Cash................................................        443           1,661              364          1,299
Dividends receivable................................        124             261              160            366
Receivable for capital shares issued................        275             117              451            622
Receivable from Administrator.......................         56              33               72             20
                                                       --------        --------         --------       --------
TOTAL ASSETS........................................    103,870         128,710           42,450        122,656
                                                       --------        --------         --------       --------
LIABILITIES:
Dividends payable...................................         76             218              144            340
Payable for capital shares redeemed.................         42             169                4             13
Accrued expenses and other payables:
    Investment advisory fees........................          1               1               --              4
    12b-1 fees......................................         29              31               13             23
    Other...........................................         33              38               29             35
                                                       --------        --------         --------       --------
TOTAL LIABILITIES...................................        181             457              190            415
                                                       --------        --------         --------       --------
NET ASSETS:
Capital.............................................     96,895         121,589           41,373        115,321
Accumulated undistributed net realized gains
  (losses) from investment transactions.............      4,666           4,401              514          3,114
Unrealized appreciation from investments............      2,128           2,263              373          3,806
                                                       --------        --------         --------       --------
NET ASSETS..........................................   $103,689        $128,253         $ 42,260       $122,241
                                                       ========        ========         ========       ========
NET ASSETS:
    Fiduciary.......................................   $ 52,831        $ 75,782         $ 22,852       $ 85,021
    Class A.........................................     17,581          15,719            3,334         10,111
    Class B.........................................     29,285          34,254           13,791         24,509
    Class C.........................................      3,992           2,498            2,283          2,600
                                                       --------        --------         --------       --------
    Total...........................................   $103,689        $128,253         $ 42,260       $122,241
                                                       ========        ========         ========       ========
OUTSTANDING UNITS OF BENEFICIAL INTEREST (SHARES):
    Fiduciary.......................................      4,435           6,618            2,160          7,730
    Class A.........................................      1,483           1,360              316            917
    Class B.........................................      2,442           2,972            1,304          2,225
    Class C.........................................        336             219              216            237
                                                       --------        --------         --------       --------
    Total...........................................      8,696          11,169            3,996         11,109
                                                       ========        ========         ========       ========
Net Asset Value:
    Fiduciary
        Offering and redemption price per share.....   $  11.91        $  11.45         $  10.58       $  11.00
                                                       ========        ========         ========       ========
    Class A
        Redemption price per share..................   $  11.86        $  11.55         $  10.57       $  11.02
                                                       ========        ========         ========       ========
        Maximum sales charge........................       4.50%           4.50%            4.50%          4.50%
                                                       ========        ========         ========       ========
        Maximum offering price per share
          (100%/(100%-maximum sales charge) of
          net asset value adjusted to nearest
          cent).....................................   $  12.42        $  12.09         $  11.07       $  11.54
                                                       ========        ========         ========       ========
    Class B
        Offering price per share (a)................   $  11.99        $  11.53         $  10.57       $  11.02
                                                       ========        ========         ========       ========
    Class C
        Offering price per share (a)................   $  11.88        $  11.43         $  10.55       $  10.98
                                                       ========        ========         ========       ========
</TABLE>
 
- ------------
 
(a) Redemption price varies based on length of time shares are held.
 
See notes to financial statements.
 
  10
<PAGE>   13
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
STATEMENTS OF OPERATIONS              FOR THE SIX MONTHS ENDED DECEMBER 31, 1997
(Amounts in Thousands)
(Unaudited)
 
<TABLE>
<CAPTION>
                                                                            INVESTOR
                                        INVESTOR      INVESTOR GROWTH     CONSERVATIVE      INVESTOR
                                       GROWTH FUND     & INCOME FUND      GROWTH FUND     BALANCED FUND
                                      -------------   ----------------   --------------   -------------
<S>                                   <C>             <C>                <C>              <C>
INVESTMENT INCOME:
Interest income.....................     $    6            $    6            $    5          $    5
Distribution income.................        499             1,145               707           1,807
                                         ------            ------            ------          ------
TOTAL INCOME........................        505             1,151               712           1,812
                                         ------            ------            ------          ------
EXPENSES:
Investment advisory fees............         17                22                 7              25
Administration fees.................         34                44                14              49
12b-1 fees (Class A)................         19                17                 4              10
12b-1 fees (Class B)................         86               102                35              69
12b-1 fees (Class C)................         10                 3                 4               4
Custodian and accounting fees.......         23                21                22              18
Legal and audit fees................          1                 1                --               1
Transfer agent fees.................         29                31                27              26
Registration and filing fees........         38                40                31              44
Printing costs......................         21                18                13               9
Other...............................          3                 3                 2              --
                                         ------            ------            ------          ------
Total expenses before waivers/
  reimbursements....................        281               302               159             255
Less waivers/reimbursements.........        (97)              (90)              (83)            (72)
                                         ------            ------            ------          ------
NET EXPENSES........................        184               212                76             183
                                         ------            ------            ------          ------
Net Investment Income...............        321               939               636           1,629
                                         ------            ------            ------          ------
REALIZED/UNREALIZED GAINS (LOSSES)
  FROM INVESTMENTS:
Net realized gains (losses) from
  investment transactions...........      7,253             7,165               876           5,427
Net change in unrealized
  appreciation (depreciation) from
  investments.......................     (1,968)           (1,570)              (88)           (674)
                                         ------            ------            ------          ------
Net realized/unrealized gains from
  investments.......................      5,285             5,595               788           4,753
                                         ------            ------            ------          ------
Change in net assets resulting from
  operations........................     $5,606            $6,534            $1,424          $6,382
                                         ======            ======            ======          ======
</TABLE>
 
See notes to financial statements.
 
                                                                              11
<PAGE>   14
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
STATEMENTS OF CHANGES IN NET ASSETS
(Amounts in Thousands)
<TABLE>
<CAPTION>
                                                                                        INVESTOR GROWTH &
                                                    INVESTOR GROWTH FUND                   INCOME FUND
                                                 ---------------------------       ---------------------------
                                                  SIX MONTHS    DECEMBER 10,        SIX MONTHS    DECEMBER 10,
                                                    ENDED       1996 THROUGH          ENDED       1996 THROUGH
                                                 DECEMBER 31,     JUNE 30,         DECEMBER 31,     JUNE 30,
                                                     1997         1997(a)              1997         1997(a)
                                                   --------       --------           --------       --------
                                                 (UNAUDITED)                       (UNAUDITED)
<S>                                              <C>            <C>                <C>            <C>
FROM INVESTMENT ACTIVITIES:
OPERATIONS:
    Net Investment Income......................    $    321       $    256           $    939       $    556
    Net realized gains (losses) from investment
       transactions............................       7,253            (59)             7,165            (87)
    Net change in unrealized appreciation
       (depreciation) from investments.........      (1,968)         4,096             (1,570)         3,833
                                                   --------       --------           --------       --------
Change in net assets resulting from
  operations...................................       5,606          4,293              6,534          4,302
                                                   --------       --------           --------       --------
DISTRIBUTIONS TO FIDUCIARY SHAREHOLDERS:
    From net investment income.................        (233)          (227)              (673)          (494)
    From net realized gains....................      (1,180)            --             (1,513)            --
DISTRIBUTIONS TO CLASS A SHAREHOLDERS:
    From net investment income.................         (57)           (14)              (109)           (24)
    From net realized gains....................        (471)            --               (348)            --
DISTRIBUTIONS TO CLASS B SHAREHOLDERS:
    From net investment income.................         (27)           (15)              (150)           (38)
    From net realized gains....................        (776)            --               (761)            --
DISTRIBUTIONS TO CLASS C SHAREHOLDERS:
    From net investment income.................          (4)            --                 (7)            --
    From net realized gains....................        (101)            --                (55)            --
                                                   --------       --------           --------       --------
Change in net assets from shareholder
  distributions................................      (2,849)          (256)            (3,616)          (556)
                                                   --------       --------           --------       --------
CAPITAL TRANSACTIONS:
    Proceeds from shares issued................      50,771         41,705             58,801         58,244
    Proceeds from shares issued in connection
       with conversion.........................      10,702             --             12,936             --
    Dividends reinvested.......................       2,530             25              2,952             49
    Cost of shares redeemed....................      (6,479)        (2,359)            (6,172)        (5,221)
                                                   --------       --------           --------       --------
Change in net assets from share transactions...      57,524         39,371             68,517         53,072
                                                   --------       --------           --------       --------
Change in net assets...........................      60,281         43,408             71,435         56,818
NET ASSETS:
    Beginning of period........................      43,408             --             56,818             --
                                                   --------       --------           --------       --------
    End of period..............................    $103,689       $ 43,408           $128,253       $ 56,818
                                                   ========       ========           ========       ========
SHARE TRANSACTIONS:
    Issued.....................................       4,243          4,079              5,108          5,697
    Issued in connection with conversion.......         922             --              1,150             --
    Reinvested.................................         215              3                258              4
    Redeemed...................................        (538)          (227)              (537)          (510)
                                                   --------       --------           --------       --------
Change in shares...............................       4,842          3,855              5,979          5,191
                                                   ========       ========           ========       ========
</TABLE>
 
- ------------
 
(a) Period from commencement of operations.
See notes to financial statements.
 
  12
<PAGE>   15
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
STATEMENTS OF CHANGES IN NET ASSETS
(Amounts in Thousands)
<TABLE>
<CAPTION>
                                                    INVESTOR CONSERVATIVE
                                                         GROWTH FUND                 INVESTOR BALANCED FUND
                                                 ---------------------------       ---------------------------
                                                  SIX MONTHS    DECEMBER 10,        SIX MONTHS    DECEMBER 10,
                                                    ENDED       1996 THROUGH          ENDED       1996 THROUGH
                                                 DECEMBER 31,     JUNE 30,         DECEMBER 31,     JUNE 30,
                                                     1997         1997(a)              1997         1997(a)
                                                   --------       --------           --------       --------
                                                 (UNAUDITED)                       (UNAUDITED)
<S>                                              <C>            <C>                <C>            <C>
FROM INVESTMENT ACTIVITIES:
OPERATIONS:
    Net Investment Income......................    $    636       $    333           $  1,629       $  1,187
    Net realized gains (losses) from investment
       transactions............................         876              9              5,427            (67)
    Net change in unrealized appreciation
       (depreciation) from investments.........         (88)           461               (674)         4,480
                                                   --------       --------           --------       --------
Change in net assets resulting from
  operations...................................       1,424            803              6,382          5,600
                                                   --------       --------           --------       --------
DISTRIBUTIONS TO FIDUCIARY SHAREHOLDERS:
    From net investment income.................        (426)          (296)            (1,322)        (1,132)
    From net realized gains....................        (205)            --             (1,584)            --
DISTRIBUTIONS TO CLASS A SHAREHOLDERS:
    From net investment income.................         (51)           (14)              (101)           (15)
    From net realized gains....................         (29)            --               (185)            --
DISTRIBUTIONS TO CLASS B SHAREHOLDERS:
    From net investment income.................        (139)           (23)              (193)           (40)
    From net realized gains....................        (120)            --               (440)            --
DISTRIBUTIONS TO CLASS C SHAREHOLDERS:
    From net investment income.................         (20)            --                (13)            --
    From net realized gains....................         (17)            --                (37)            --
                                                   --------       --------           --------       --------
Change in net assets from shareholder
  distributions................................      (1,007)          (333)            (3,875)        (1,187)
                                                   --------       --------           --------       --------
CAPITAL TRANSACTIONS:
    Proceeds from shares issued................      23,754         21,496             45,602         78,898
    Proceeds from shares issued in connection
       with conversion.........................         707             --              6,532             --
    Dividends reinvested.......................         573             41              2,557             49
    Cost of shares redeemed....................      (2,144)        (3,054)           (14,960)        (3,357)
                                                   --------       --------           --------       --------
Change in net assets from share transactions...      22,890         18,483             39,731         75,590
                                                   --------       --------           --------       --------
Change in net assets...........................      23,307         18,953             42,238         80,003

NET ASSETS:
    Beginning of period........................      18,953             --             80,003             --
                                                   --------       --------           --------       --------
    End of period..............................    $ 42,260       $ 18,953           $122,241       $ 80,003
                                                   ========       ========           ========       ========
SHARE TRANSACTIONS:
    Issued.....................................       2,242          2,132              4,113          7,850
    Issued in connection with conversion.......          67             --                600             --
    Reinvested.................................          54              5                233              5
    Redeemed...................................        (201)          (303)            (1,363)          (328)
                                                   --------       --------           --------       --------
Change in shares...............................       2,162          1,834              3,583          7,527
                                                   ========       ========           ========       ========
</TABLE>
 
- ------------
 
(a) Period from commencement of operations.
See notes to financial statements.
 
                                                                              13
<PAGE>   16
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS                                  DECEMBER 31, 1997
(Unaudited)
 
1. ORGANIZATION:
 
   The One Group (the "Trust") is registered under the Investment Company Act of
   1940, as amended (the "1940 Act"), as an open-end investment company
   established as a Massachusetts business trust. The accompanying financial
   statements and financial highlights are those of the Investor Growth Fund,
   the Investor Growth & Income Fund, the Investor Conservative Growth Fund and
   the Investor Balanced Fund (individually a "Fund", collectively the "Funds")
   only.
 
   The Funds' investment objectives are as follows:
 
<TABLE>
<CAPTION>
                 FUND                                               OBJECTIVE
                 ----                                               ---------
   <S>                                     <C>
   Investor Growth Fund                    Long-term capital appreciation by investing primarily in a
                                            diversified group of The One Group mutual funds which
                                            invest primarily in equity securities.
 
   Investor Growth & Income Fund           Long-term capital appreciation and growth of income by
                                            investing primarily in a diversified group of The One Group
                                            mutual funds which invest primarily in equity securities.
 
   Investor Conservative Growth Fund       Income and capital appreciation by investing primarily in a
                                            diversified group of The One Group mutual funds which
                                            invest primarily in equity and fixed income securities.
 
   Investor Balanced Fund                  High total return consistent with the preservation of
                                            capital by investing primarily in a diversified group of
                                            The One Group mutual funds which invest primarily in equity
                                            and fixed income securities.
</TABLE>
 
2. SIGNIFICANT ACCOUNTING POLICIES:
 
The following is a summary of significant accounting policies followed by the
Trust in preparation of its financial statements. The policies are in conformity
with generally accepted accounting principles. The preparation of financial
statements requires management to make estimates and assumptions that affect the
reported amounts of assets and liabilities at the date of the financial
statements and the reported amounts of income and expenses for the period.
Actual results could differ from those estimates.
 
     SECURITY VALUATION
 
     Investments in The One Group mutual funds (the "Underlying Funds") are
     valued at the closing net asset value per share of each Underlying Fund on
     the day of valuation. Short-term investments maturing in 60 days or less
     are valued at amortized cost, which approximates market value.
 
     SECURITY TRANSACTIONS AND RELATED INCOME
 
     Purchases and sales of the Underlying Funds are accounted for on a trade
     date basis. Net realized gains or losses on sales of the Underlying Funds
     are determined on the specific identification cost method. Other income and
     expenses are recognized on the accrual basis. Distributions from the
     Underlying Funds and dividends to the Funds' shareholders are recorded on
     the ex-dividend date.
 
     EXPENSES
 
     Expenses directly attributable to a Fund are charged directly to that Fund,
     while the expenses which are attributable to more than one fund of the
     Trust are allocated among the respective Funds. Each class of shares
 
Continued
 
  14
<PAGE>   17
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS, CONTINUED                       DECEMBER 31, 1997
(Unaudited)
 
     bears its pro-rata portion of expenses attributable to its series, except
     that each class separately bears expenses related specifically to that
     class, such as distribution fees.
 
     DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS
 
     Dividends from net investment income are declared and paid monthly for the
     Funds. Net realized capital gains, if any, are distributed at least
     annually. Dividends are declared separately for each class. No class has
     preferential dividend rights; differences in per share dividend rates are
     due to differences in separate class expenses.
 
     Distributions from net investment income and from net capital gains are
     determined in accordance with income tax regulations which may differ from
     generally accepted accounting principles. These differences are primarily
     due to differing treatments for expiring capital loss carryforwards and
     deferrals of certain losses. Permanent book and tax basis differences,
     which affect shareholder distributions, will be reclassified to additional
     paid-in capital.
 
     FEDERAL INCOME TAXES
 
     The Trust treats each Fund as a separate entity for Federal income tax
     purposes. Each Fund intends to continue to qualify as a regulated
     investment company by complying with the provisions available to certain
     investment companies as defined in applicable sections of the Internal
     Revenue Code, and to make distributions from net investment income and from
     net realized capital gains sufficient to relieve it from all, or
     substantially all, Federal income taxes.
 
3. SHARES OF BENEFICIAL INTEREST:
 
   The Trust has an unlimited number of shares of beneficial interest, with no
   par value, which may, without shareholder approval, be divided into an
   unlimited number of series of such shares and any series may be classified or
   reclassified into one or more classes. The Trust is registered to offer forty
   series and five classes of shares: Fiduciary Class, Class A, Class B, Class C
   and Service Class. Currently, the Trust consists of thirty-three active
   Funds. The Funds are each authorized to issue Fiduciary Class, Class A, Class
   B and Class C Shares. Class A Shares are subject to initial sales charges,
   imposed at the time of purchase, in accordance with the Funds' prospectus.
   Certain redemptions of Class B and Class C Shares are subject to contingent
   deferred sales charges in accordance with the Funds' prospectus. As of
   December 31, 1997, there were no shareholders in the Service Class.
   Shareholders are entitled to one vote for each full share held and will vote
   in the aggregate and not by class or series, except as otherwise expressly
   required by law or when the Board of Trustees has determined that the matter
   to be voted on affects only the interest of shareholders of a particular
   class or series. The following is a summary of transactions in Fund shares
   for the periods ended December 31, 1997 and June 30, 1997:
 
Continued
 
                                                                              15
<PAGE>   18
 
   -----------------------------------------------------------------------------
   The One Group Family of Mutual Funds
 
   -----------------------------------------------------------------------------
   NOTES TO FINANCIAL STATEMENTS, CONTINUED                    DECEMBER 31, 1997
   (Amounts in Thousands)
 
<TABLE>
<CAPTION>
                                                                      INVESTOR GROWTH FUND
                                                                 ------------------------------
                                                                  SIX MONTHS       DECEMBER 10,
                                                                    ENDED          1996 THROUGH
                                                                 DECEMBER 31,        JUNE 30,
                                                                     1997            1997(a)
                                                                 ------------      ------------
                                                                 (UNAUDITED)
   <S>                                                           <C>               <C>
   CAPITAL TRANSACTIONS:
   FIDUCIARY SHARES:
     Proceeds from shares issued...............................    $12,849           $30,381
     Proceeds from shares issued in connection with
       conversion..............................................     10,702                --
     Dividends reinvested......................................      1,127                11
     Cost of shares redeemed...................................     (5,315)           (2,252)
                                                                   -------           -------
     Change in net assets from Fiduciary share transactions....    $19,363           $28,140
                                                                   =======           =======
   CLASS A SHARES:
     Proceeds from shares issued...............................    $12,942           $ 4,125
     Dividends reinvested......................................        508                 7
     Cost of shares redeemed...................................       (566)              (19)
                                                                   -------           -------
     Change in net assets from Class A share transactions......    $12,884           $ 4,113
                                                                   =======           =======
   CLASS B SHARES:
     Proceeds from shares issued...............................    $21,043           $ 7,199
     Dividends reinvested......................................        792                 7
     Cost of shares redeemed...................................       (551)              (88)
                                                                   -------           -------
     Change in net assets from Class B share transactions......    $21,284           $ 7,118
                                                                   =======           =======
   CLASS C SHARES:
     Proceeds from shares issued...............................    $ 3,937           $    --
     Dividends reinvested......................................        103                --
     Cost of shares redeemed...................................        (47)               --
                                                                   -------           -------
     Change in net assets from Class C share transactions......    $ 3,993           $    --
                                                                   =======           =======
   SHARE TRANSACTIONS:
   FIDUCIARY SHARES:
     Issued....................................................      1,075             3,000
     Issued in connection with conversion......................        922                --
     Reinvested................................................         96                 1
     Redeemed..................................................       (441)             (217)
                                                                   -------           -------
     Change in Fiduciary Shares................................      1,652             2,784
                                                                   =======           =======
   CLASS A SHARES:
     Issued....................................................      1,091               397
     Reinvested................................................         43                 1
     Redeemed..................................................        (47)               (2)
                                                                   -------           -------
     Change in Class A Shares..................................      1,087               396
                                                                   =======           =======
   CLASS B SHARES:
     Issued....................................................      1,746               682
     Reinvested................................................         67                 1
     Redeemed..................................................        (46)               (8)
                                                                   -------           -------
     Change in Class B Shares..................................      1,767               675
                                                                   =======           =======
   CLASS C SHARES:
     Issued....................................................        331                --
     Reinvested................................................          9                --
     Redeemed..................................................         (4)               --
                                                                   -------           -------
     Change in Class C Shares..................................        336                --
                                                                   =======           =======
</TABLE>
 
- ------------
 
(a) Period from commencement of operations.
(b) Rounds to less than 1,000.
 
Continued
 
  16
<PAGE>   19
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS, CONTINUED                       DECEMBER 31, 1997
(Amounts in Thousands)
 
<TABLE>
<CAPTION>
      INVESTOR GROWTH &              INVESTOR CONSERVATIVE                   INVESTOR
         INCOME FUND                      GROWTH FUND                     BALANCED FUND
- ------------------------------   ------------------------------   ------------------------------
 SIX MONTHS       DECEMBER 10,    SIX MONTHS       DECEMBER 10,    SIX MONTHS       DECEMBER 10,
   ENDED          1996 THROUGH      ENDED          1996 THROUGH      ENDED          1996 THROUGH
DECEMBER 31,        JUNE 30,     DECEMBER 31,        JUNE 30,     DECEMBER 31,        JUNE 30,
    1997            1997(a)          1997            1997(a)          1997            1997(a)
- ------------      ------------   ------------      ------------   ------------      ------------
(UNAUDITED)                      (UNAUDITED)                      (UNAUDITED)
<S>               <C>            <C>               <C>            <C>               <C>
  $20,052           $45,181        $ 8,085           $17,645        $16,325           $71,345
   12,936                --            707                --          6,532                --
    1,574                13            256                18          1,662                15
   (4,860)           (4,561)        (1,582)           (2,999)       (14,031)           (3,309)
  -------           -------        -------           -------        -------           -------
  $29,702           $40,633        $ 7,466           $14,664        $10,488           $68,051
  =======           =======        =======           =======        =======           =======
  $11,293           $ 4,604        $ 2,219           $ 1,283        $ 7,786           $ 2,092
      434                14             66                 8            261                 9
     (457)             (606)          (282)              (29)          (151)               --
  -------           -------        -------           -------        -------           -------
  $11,270           $ 4,012        $ 2,003           $ 1,262        $ 7,896           $ 2,101
  =======           =======        =======           =======        =======           =======
  $25,001           $ 8,459        $11,173           $ 2,568        $18,923           $ 5,461
      886                22            221                15            591                25
     (853)              (54)          (254)              (26)          (774)              (48)
  -------           -------        -------           -------        -------           -------
  $25,034           $ 8,427        $11,140           $ 2,557        $18,740           $ 5,438
  =======           =======        =======           =======        =======           =======
  $ 2,455           $    --        $ 2,277           $    --        $ 2,568           $    --
       58                --             30                --             43                --
       (2)               --            (26)               --             (4)               --
  -------           -------        -------           -------        -------           -------
  $ 2,511           $    --        $ 2,281           $    --        $ 2,607           $    --
  =======           =======        =======           =======        =======           =======
    1,758             4,443            763             1,750          1,469             7,112
    1,150                --             67                --            600                --
      138                 1             24                 2            151                 2
     (424)             (448)          (149)             (297)        (1,279)             (324)
  -------           -------        -------           -------        -------           -------
    2,622             3,996            705             1,455            941             6,790
  =======           =======        =======           =======        =======           =======
      976               443            210               128            703               203
       38                 1              6                 1             24                 1
      (40)              (57)           (26)               (3)           (14)               --
  -------           -------        -------           -------        -------           -------
      974               387            190               126            713               204
  =======           =======        =======           =======        =======           =======
    2,160               811          1,054               254          1,708               535
       77                 2             21                 2             54                 2
      (73)               (5)           (24)               (3)           (70)               (4)
  -------           -------        -------           -------        -------           -------
    2,164               808          1,051               253          1,692               533
  =======           =======        =======           =======        =======           =======
      214                --            215                --            233                --
        5                --              3                --              4                --
       --(b)             --             (2)               --             --(b)             --
  -------           -------        -------           -------        -------           -------
      219                --            216                --            237                --
  =======           =======        =======           =======        =======           =======
</TABLE>
 
Continued
 
                                                                              17
<PAGE>   20
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS, CONTINUED                       DECEMBER 31, 1997
(Unaudited)
 
4. INVESTMENT ADVISORY, ADMINISTRATIVE, AND DISTRIBUTION AGREEMENTS:
 
   The Trust and Banc One Investment Advisors Corporation (the "Advisor") are
   parties to an investment advisory agreement under which the Advisor is
   entitled to receive an annual fee, computed daily and paid monthly, equal to
   0.05% of the average net assets of the Investor Growth Fund, the Investor
   Growth & Income Fund, the Investor Conservative Growth Fund and the Investor
   Balanced Fund, respectively.
 
   The Trust and The One Group Services Company (the "Administrator"), a
   wholly-owned subsidiary of The BISYS Group, Inc., are parties to an
   administrative agreement under which the Administrator provides services for
   a fee that is computed daily and payable monthly, at an annual rate of 0.10%
   on the first $500 million of each Fund's average daily net assets, 0.075% of
   each Fund's average daily net assets between $500 million and $1 billion, and
   0.05% of each Fund's average daily net assets when Fund assets exceed $1
   billion. The Advisor also serves as sub-Administrator to each Fund of the
   Trust, pursuant to an agreement between the Administrator and the Advisor.
   Pursuant to this agreement, the Advisor performs many of the Administrator's
   duties, for which the Advisor receives a fee paid by the Administrator.
 
   The Trust and The One Group Services Company (the "Distributor") are parties
   to a distribution agreement under which shares of the Funds are sold on a
   continuous basis. Class A, Class B and Class C Shares are subject to a
   distribution and shareholder services plan (the "Plans") pursuant to Rule
   12b-1 under the 1940 Act. As provided in the Plans, the Trust will pay the
   Distributor a fee of 0.35% of the average daily net assets of Class A Shares
   of each of the Funds and 1.00% of the average daily net assets of the Class B
   and Class C Shares of each of the Funds. Currently, the Distributor has
   voluntarily agreed to limit payments under the Plans to 0.25% of average
   daily net assets of the Class A Shares of each Fund. Up to 0.25% of the fees
   payable under the Plans may be used as compensation for shareholder services
   by the Distributor and/or financial institutions and intermediaries. Fees
   paid under the Plans may be applied by the Distributor toward (i)
   compensation for its services in connection with distribution assistance or
   provision of shareholder services; or (ii) payments to financial institutions
   and intermediaries such as banks (including affiliates of the Advisor),
   brokers, dealers and other institutions, including the Distributor's
   affiliates and subsidiaries as compensation for services or reimbursement of
   expenses incurred in connection with distribution assistance or provision of
   shareholder services. Fiduciary Class Shares of each Fund are offered without
   distribution fees. For the six months ended December 31, 1997, the
   Distributor received $3,946,510 from commissions earned on sales of Class A
   Shares and redemptions of Class B and Class C Shares, of which, the
   Distributor re-allowed $3,946,448 to affiliated broker-dealers of the Funds.
 
   Certain officers of the Trust are affiliated with the Administrator. Such
   officers receive no compensation from the Funds for serving in their
   respective roles.
 
   The Advisor, the Administrator and the Distributor voluntarily agreed to
   waive a portion of their fees and to reimburse the Funds for certain
   expenses. For the six months ended December 31, 1997, fees in the following
   amounts were waived and reimbursed from the funds (amounts in thousands):
 
<TABLE>
<CAPTION>
                                           INVESTMENT                       12b-1 FEES       FEES
                                          ADVISORY FEES   ADMINISTRATION      WAIVED     REIMBURSED BY
                                             WAIVED         FEES WAIVED      CLASS A     ADMINISTRATOR
                                          -------------   ---------------   ----------   -------------
   <S>                                    <C>             <C>               <C>          <C>
   Investor Growth Fund.................       $14              $34            $ 5            $44
   Investor Growth & Income Fund........        18               44              5             23
   Investor Conservative Growth Fund....         6               14              1             62
   Investor Balanced Fund...............        11               49              3              9
</TABLE>
 
Continued
 
  18
<PAGE>   21
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS, CONTINUED                       DECEMBER 31, 1997
(Unaudited)
 
5. SECURITIES TRANSACTIONS:
 
   The cost of security purchases and the proceeds from the sale of securities
   (excluding short-term securities and purchased options) during the six months
   ended December 31, 1997 were as follows (amounts in thousands):
 
<TABLE>
<CAPTION>
                                                         PURCHASES    SALES
                                                         ---------   -------
<S>                                                      <C>         <C>
Investor Growth Fund...................................   $65,756    $ 4,603
Investor Growth & Income Fund..........................    74,851      3,821
Investor Conservative Growth Fund......................    23,258      1,121
Investor Balanced Fund.................................    54,084     12,310
</TABLE>
 
6. CONVERSION OF COMMON TRUST FUNDS:
 
   On December 19, 1997 the net assets of certain common trust funds managed by
   the Advisor were exchanged for shares of the corresponding One Group Funds.
   The transaction was accounted for by a method followed for tax purposes in a
   tax-free business combination. The following is a summary of shares issued,
   net assets converted, net asset value per share issued and unrealized
   appreciation of assets acquired as of the conversion date (amounts in
   thousands except per share amounts):
 
<TABLE>
<CAPTION>
                                                                                  NET ASSET
                                                         SHARES    NET ASSETS     VALUE PER      UNREALIZED
                                                         ISSUED    CONVERTED    SHARE ISSUED    APPRECIATION
                                                         -------   ----------   -------------   ------------
   <S>                                                   <C>       <C>          <C>             <C>
   Investor Growth Fund................................     922     $10,702        $11.61           $--
   Investor Growth & Income Fund.......................   1,150     $12,936        $11.25            --
   Investor Conservative Growth Fund...................      67     $   707        $10.56            --
   Investor Balanced Fund..............................     600     $ 6,532        $10.89            --
</TABLE>
 
                                                                              19
<PAGE>   22
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                         INVESTOR
                                                                          GROWTH
                                                                           FUND
                                                              -------------------------------
                                                                         FIDUCIARY
                                                              -------------------------------
                                                               SIX MONTHS       DECEMBER 10,
                                                                 ENDED          1996 THROUGH
                                                              DECEMBER 31,        JUNE 30,
                                                                  1997             1997(a)
                                                              ------------      -------------
                                                              (UNAUDITED)
<S>                                                           <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................    $ 11.25            $ 10.00
                                                                -------            -------
Investment Activities
  Net investment income.....................................       0.07               0.09
  Net realized and unrealized gains (losses) from
     investments............................................       1.01               1.25
                                                                -------            -------
     Total from Investment Activities.......................       1.08               1.34
                                                                -------            -------
Distributions
  From net investment income................................      (0.07)             (0.09)
  From net realized gains...................................      (0.35)              0.00
                                                                -------            -------
     Total Distributions....................................      (0.42)             (0.09)
                                                                -------            -------
NET ASSET VALUE,
  END OF PERIOD.............................................    $ 11.91            $ 11.25
                                                                =======            =======
Total Return................................................       9.66%(b)          13.50%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................    $52,831            $31,318
  Ratio of expenses to average net assets...................       0.20%(c)           0.20%(c)
  Ratio of net investment income to average net assets......       1.28%(c)           1.70%(c)
  Ratio of expenses to average net assets *.................       0.47%(c)           0.77%(c)
  Ratio of net investment income to average net assets *....       1.01%(c)           1.13%(c)
  Portfolio turnover (d)....................................       6.81%             18.49%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  20
<PAGE>   23
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                            GROWTH
                                                                             FUND
                                                                ------------------------------
                                                                           CLASS A
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 11.21           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.06              0.07
  Net realized and unrealized gains (losses) from
     investments............................................         1.00              1.21
                                                                  -------           -------
     Total from Investment Activities.......................         1.06              1.28
                                                                  -------           -------
Distributions
  From net investment income................................        (0.06)            (0.07)
  From net realized gains...................................        (0.35)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.41)            (0.07)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.86           $ 11.21
                                                                  =======           =======
Total Return (Excludes Sales Charge)........................         9.49%(b)         12.84%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $17,581           $ 4,439
  Ratio of expenses to average net assets...................         0.45%(c)          0.46%(c)
  Ratio of net investment income to average net assets......         1.03%(c)          1.82%(c)
  Ratio of expenses to average net assets *.................         0.82%(c)          1.62%(c)
  Ratio of net investment income to average net assets *....         0.66%(c)          0.66%(c)
  Portfolio turnover (d)....................................         6.81%            18.49%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              21
<PAGE>   24
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                            GROWTH
                                                                             FUND
                                                                ------------------------------
                                                                           CLASS B
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 11.34           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.02              0.04
  Net realized and unrealized gains (losses) from
     investments............................................         1.00              1.34
                                                                  -------           -------
     Total from Investment Activities.......................         1.02              1.38
                                                                  -------           -------
Distributions
  From net investment income................................        (0.02)            (0.04)
  From net realized gains...................................        (0.35)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.37)            (0.04)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.99           $ 11.34
                                                                  =======           =======
Total Return (Excludes Sales Charge)........................         9.03%(b)         13.88% (b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $29,285           $ 7,651
  Ratio of expenses to average net assets...................         1.20%(c)          1.20% (c)
  Ratio of net investment income to average net assets......         0.28%(c)          0.97% (c)
  Ratio of expenses to average net assets *.................         1.47%(c)          2.18% (c)
  Ratio of net investment income to average net assets *....         0.01%(c)         (0.01%)(c)
  Portfolio turnover (d)....................................         6.81%            18.49%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  22
<PAGE>   25
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                  INVESTOR
                                                                   GROWTH
                                                                    FUND
                                                                ------------
                                                                  CLASS C
                                                                ------------
                                                                 SIX MONTHS
                                                                   ENDED
                                                                DECEMBER 31,
                                                                  1997(a)
                                                                ------------
                                                                (UNAUDITED)
<S>                                                             <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 11.25
                                                                  -------
Investment Activities
  Net investment income.....................................         0.02
  Net realized and unrealized gains (losses) from
     investments............................................         0.98
                                                                  -------
     Total from Investment Activities.......................         1.00
                                                                  -------
Distributions
  From net investment income................................        (0.02)
  From net realized gains...................................        (0.35)
                                                                  -------
     Total Distributions....................................        (0.37)
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.88
                                                                  =======
Total Return (Excludes Sales Charge)........................         8.99%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $ 3,992
  Ratio of expenses to average net assets...................         1.20%(c)
  Ratio of net investment income to average net assets......         0.28%(c)
  Ratio of expenses to average net assets *.................         1.47%(c)
  Ratio of net investment income to average net assets *....         0.01%(c)
  Portfolio turnover (d)....................................         6.81%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              23
<PAGE>   26
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                            GROWTH
                                                                           & INCOME
                                                                             FUND
                                                                ------------------------------
                                                                          FIDUCIARY
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.93           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.13              0.15
  Net realized and unrealized gains (losses) from
     investments............................................         0.80              0.93
                                                                  -------           -------
     Total from Investment Activities.......................         0.93              1.08
                                                                  -------           -------
Distributions
  From net investment income................................        (0.13)            (0.15)
  From net realized gains...................................        (0.28)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.41)            (0.15)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.45           $ 10.93
                                                                  =======           =======
Total Return................................................         8.55%(b)         10.87%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $75,782           $43,660
  Ratio of expenses to average net assets...................         0.20%(c)          0.20%(c)
  Ratio of net investment income to average net assets......         2.41%(c)          2.78%(c)
  Ratio of expenses to average net assets *.................         0.41%(c)          0.66%(c)
  Ratio of net investment income to average net assets *....         2.20%(c)          2.32%(c)
  Portfolio turnover (d)....................................         4.41%            18.07%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  24
<PAGE>   27
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                            INVESTOR
                                                                             GROWTH
                                                                            & INCOME
                                                                              FUND
                                                                --------------------------------
                                                                            CLASS A
                                                                --------------------------------
                                                                  SIX MONTHS        DECEMBER 10,
                                                                    ENDED           1996 THROUGH
                                                                 DECEMBER 31,         JUNE 30,
                                                                     1997             1997(a)
                                                                --------------      ------------
                                                                 (UNAUDITED)
<S>                                                             <C>                 <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................       $ 11.02            $ 10.00
                                                                   -------            -------
Investment Activities
  Net investment income.....................................          0.12               0.12
  Net realized and unrealized gains (losses) from
     investments............................................          0.81               1.02
                                                                   -------            -------
     Total from Investment Activities.......................          0.93               1.14
                                                                   -------            -------
Distributions
  From net investment income................................         (0.12)             (0.12)
  From net realized gains...................................         (0.28)              0.00
                                                                   -------            -------
     Total Distributions....................................         (0.40)             (0.12)
                                                                   -------            -------
NET ASSET VALUE,
  END OF PERIOD.............................................       $ 11.55            $ 11.02
                                                                   =======            =======
Total Return (Excludes Sales Charge)........................          8.45%(b)          11.50%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................       $15,719            $ 4,262
  Ratio of expenses to average net assets...................          0.45%(c)           0.46%(c)
  Ratio of net investment income to average net assets......          2.16%(c)           2.67%(c)
  Ratio of expenses to average net assets *.................          0.76%(c)           1.26%(c)
  Ratio of net investment income to average net assets *....          1.85%(c)           1.87%(c)
  Portfolio turnover (d)....................................          4.41%             18.07%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              25
<PAGE>   28
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                            GROWTH
                                                                           & INCOME
                                                                             FUND
                                                                ------------------------------
                                                                           CLASS B
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 11.00           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.08              0.09
  Net realized and unrealized gains (losses) from
     investments............................................         0.81              1.00
                                                                  -------           -------
     Total from Investment Activities.......................         0.89              1.09
                                                                  -------           -------
Distributions
  From net investment income................................        (0.08)            (0.09)
  From net realized gains...................................        (0.28)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.36)            (0.09)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.53           $ 11.00
                                                                  =======           =======
Total Return (Excludes Sales Charge)........................         8.11%(b)         11.02%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $34,254           $ 8,896
  Ratio of expenses to average net assets...................         1.20%(c)          1.21%(c)
  Ratio of net investment income to average net assets......         1.41%(c)          1.94%(c)
  Ratio of expenses to average net assets *.................         1.41%(c)          1.89%(c)
  Ratio of net investment income to average net assets *....         1.20%(c)          1.26%(c)
  Portfolio turnover (d)....................................         4.41%            18.07%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  26
<PAGE>   29
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                  INVESTOR
                                                                   GROWTH
                                                                  & INCOME
                                                                    FUND
                                                                ------------
                                                                  CLASS C
                                                                ------------
                                                                 SIX MONTHS
                                                                   ENDED
                                                                DECEMBER 31,
                                                                  1997(a)
                                                                ------------
                                                                (UNAUDITED)
<S>                                                             <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.93
                                                                  -------
Investment Activities
  Net investment income.....................................         0.08
  Net realized and unrealized gains (losses) from
     investments............................................         0.78
                                                                  -------
     Total from Investment Activities.......................         0.86
                                                                  -------
Distributions
  From net investment income................................        (0.08)
  From net realized gains...................................        (0.28)
                                                                  -------
     Total Distributions....................................        (0.36)
                                                                  -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.43
                                                                  =======
Total Return (Excludes Sales Charge)........................         7.98%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $ 2,498
  Ratio of expenses to average net assets...................         1.20%(c)
  Ratio of net investment income to average net assets......         1.41%(c)
  Ratio of expenses to average net assets *.................         1.41%(c)
  Ratio of net investment income to average net assets *....         1.20%(c)
  Portfolio turnover (d)....................................         4.41%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              27
<PAGE>   30
 
- --------------------------------------------------------------------------------
The One Group Family Of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                         CONSERVATIVE
                                                                         GROWTH FUND
                                                                ------------------------------
                                                                          FIDUCIARY
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.33           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.23              0.26
  Net realized and unrealized gains (losses) from
     investments............................................         0.35              0.33
                                                                  -------           -------
     Total from Investment Activities.......................         0.58              0.59
                                                                  -------           -------
Distributions
  From net investment income................................        (0.23)            (0.26)
  From net realized gains...................................        (0.10)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.33)            (0.26)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 10.58           $ 10.33
                                                                  =======           =======
Total Return................................................         5.69%(b)          6.00%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $22,852           $15,038
  Ratio of expenses to average net assets...................         0.20%(c)          0.20%(c)
  Ratio of net investment income to average net assets......         4.64%(c)          4.92%(c)
  Ratio of expenses to average net assets *.................         0.62%(c)          1.46%(c)
  Ratio of net investment income to average net assets *....         4.22%(c)          3.66%(c)
  Portfolio turnover (d)....................................         4.00%            28.46%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  28
<PAGE>   31
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                         CONSERVATIVE
                                                                         GROWTH FUND
                                                                ------------------------------
                                                                           CLASS A
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.32           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.22              0.22
  Net realized and unrealized gains (losses) from
     investments............................................         0.35              0.32
                                                                  -------           -------
     Total from Investment Activities.......................         0.57              0.54
                                                                  -------           -------
Distributions
  From net investment income................................        (0.22)            (0.22)
  From net realized gains...................................        (0.10)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.32)            (0.22)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 10.57           $ 10.32
                                                                  =======           =======
Total Return (Excludes Sales Charge)........................         5.57%(b)          5.46%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $ 3,334           $ 1,299
  Ratio of expenses to average net assets...................         0.45%(c)          0.47%(c)
  Ratio of net investment income to average net assets......         4.39%(c)          4.76%(c)
  Ratio of expenses to average net assets *.................         0.97%(c)          3.05%(c)
  Ratio of net investment income to average net assets *....         3.87%(c)          2.18%(c)
  Portfolio turnover (d)....................................         4.00%            28.46%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              29
<PAGE>   32
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                         INVESTOR
                                                                       CONSERVATIVE
                                                                       GROWTH FUND
                                                              ------------------------------
                                                                         CLASS B
                                                              ------------------------------
                                                               SIX MONTHS       DECEMBER 10,
                                                                 ENDED          1996 THROUGH
                                                              DECEMBER 31,        JUNE 30,
                                                                  1997            1997(a)
                                                              ------------      ------------
                                                              (UNAUDITED)
<S>                                                           <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................    $ 10.33           $ 10.00
                                                                -------           -------
Investment Activities
  Net investment income.....................................       0.19              0.19
  Net realized and unrealized gains (losses) from
     investments............................................       0.34              0.33
                                                                -------           -------
     Total from Investment Activities.......................       0.53              0.52
                                                                -------           -------
Distributions
  From net investment income................................      (0.19)            (0.19)
  From net realized gains...................................      (0.10)             0.00
                                                                -------           -------
     Total Distributions....................................      (0.29)            (0.19)
                                                                -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................    $ 10.57           $ 10.33
                                                                =======           =======
Total Return (Excludes Sales Charge)........................       5.13%(b)          5.30%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................    $13,791           $ 2,616
  Ratio of expenses to average net assets...................       1.20%(c)          1.21%(c)
  Ratio of net investment income to average net assets......       3.64%(c)          4.06%(c)
  Ratio of expenses to average net assets *.................       1.62%(c)          3.52%(c)
  Ratio of net investment income to average net assets *....       3.22%(c)          1.75%(c)
  Portfolio turnover (d)....................................       4.00%            28.46%
</TABLE>
 
- ------------
  * During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  30
<PAGE>   33
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                INVESTOR
                                                              CONSERVATIVE
                                                              GROWTH FUND
                                                              ------------
                                                                CLASS C
                                                              ------------
                                                               SIX MONTHS
                                                                 ENDED
                                                              DECEMBER 31,
                                                                1997(a)
                                                              ------------
                                                              (UNAUDITED)
<S>                                                           <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................    $ 10.33
                                                                -------
Investment Activities
  Net investment income.....................................       0.19
  Net realized and unrealized gains (losses) from
     investments............................................       0.32
                                                                -------
     Total from Investment Activities.......................       0.51
                                                                -------
Distributions
  From net investment income................................     (0.19)
  From net realized gains...................................     (0.10)
                                                                -------
     Total Distributions....................................     (0.29)
                                                                -------
NET ASSET VALUE,
  END OF PERIOD.............................................    $ 10.55
                                                                =======
Total Return (Excludes Sales Charge)........................       5.01%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................    $ 2,283
  Ratio of expenses to average net assets...................       1.20%(c)
  Ratio of net investment income to average net assets......       3.64%(c)
  Ratio of expenses to average net assets *.................       1.62%(c)
  Ratio of net investment income to average net assets *....       3.22%(c)
  Portfolio turnover (d)....................................       4.00%
</TABLE>
 
- ------------
 
  * During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              31
<PAGE>   34
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                             INVESTOR
                                                                             BALANCED
                                                                               FUND
                                                              --------------------------------------
                                                                            FIDUCIARY
                                                              --------------------------------------
                                                               SIX MONTHS           DECEMBER 10,
                                                                 ENDED              1996 THROUGH
                                                              DECEMBER 31,            JUNE 30,
                                                                  1997                1997(a)
                                                              ------------      --------------------
                                                              (UNAUDITED)
<S>                                                           <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................    $ 10.63               $ 10.00
                                                                -------               -------
Investment Activities
  Net investment income.....................................       0.19                  0.21
  Net realized and unrealized gains from investments........       0.59                  0.63
                                                                -------               -------
     Total from Investment Activities.......................       0.78                  0.84
                                                                -------               -------
Distributions
  From net investment income................................      (0.19)                (0.21)
  From net realized gains...................................      (0.22)                 0.00
                                                                -------               -------
     Total Distributions....................................      (0.41)                (0.21)
                                                                -------               -------
NET ASSET VALUE,                              
   END OF PERIOD............................................    $ 11.00               $ 10.63
                                                                =======               =======
Total Return................................................       7.36%(b)              8.48%(b)

RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................    $85,021               $72,155
  Ratio of expenses to average net assets...................       0.20%(c)              0.20%(c)
  Ratio of net investment income to average net assets......       3.42%(c)              3.84%(c)
  Ratio of expenses to average net assets *.................       0.34%(c)              0.56%(c)
  Ratio of net investment income to average net assets *....       3.28%(c)              3.48%(c)
  Portfolio turnover (d)....................................      12.87%                12.20%
</TABLE>
 
- ------------
  * During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  32
<PAGE>   35
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                         INVESTOR
                                                                         BALANCED
                                                                           FUND
                                                              ------------------------------
                                                                         CLASS A
                                                              ------------------------------
                                                               SIX MONTHS       DECEMBER 10,
                                                                 ENDED          1996 THROUGH
                                                              DECEMBER 31,        JUNE 30,
                                                                  1997            1997(a)
                                                              ------------      ------------
                                                              (UNAUDITED)
<S>                                                           <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................    $ 10.66           $ 10.00
                                                                -------           -------
Investment Activities
  Net investment income.....................................       0.17              0.17
  Net realized and unrealized gains from investments........       0.58              0.66
                                                                -------           -------
     Total from Investment Activities.......................       0.75              0.83
                                                                -------           -------
Distributions
  From net investment income................................      (0.17)            (0.17)
  From net realized gains...................................      (0.22)             0.00
                                                                -------           -------
     Total Distributions....................................      (0.39)            (0.17)
                                                                -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................    $ 11.02           $ 10.66
                                                                =======           =======
 
Total Return (Excludes Sales Charge)........................       7.13%(b)          8.41%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................    $10,111           $ 2,176
  Ratio of expenses to average net assets...................       0.45%(c)          0.47%(c)
  Ratio of net investment income to average net assets......       3.17%(c)          3.78%(c)
  Ratio of expenses to average net assets *.................       0.69%(c)          1.12%(c)
  Ratio of net investment income to average net assets *....       2.93%(c)          3.13%(c)
  Portfolio turnover (d)....................................      12.87%            12.20%
</TABLE>
 
- ------------
  * During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              33
<PAGE>   36
 
- --------------------------------------------------------------------------------
The One Group Family Of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                           INVESTOR
                                                                           BALANCED
                                                                             FUND
                                                                ------------------------------
                                                                           CLASS B
                                                                ------------------------------
                                                                 SIX MONTHS       DECEMBER 10,
                                                                   ENDED          1996 THROUGH
                                                                DECEMBER 31,        JUNE 30,
                                                                    1997            1997(a)
                                                                ------------      ------------
                                                                (UNAUDITED)
<S>                                                             <C>               <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.65           $ 10.00
                                                                  -------           -------
Investment Activities
  Net investment income.....................................         0.14              0.16
  Net realized and unrealized gains from investments........         0.59              0.65
                                                                  -------           -------
     Total from Investment Activities.......................         0.73              0.81
                                                                  -------           -------
Distributions
  From net investment income................................        (0.14)            (0.16)
  From net realized gains...................................        (0.22)             0.00
                                                                  -------           -------
     Total Distributions....................................        (0.36)            (0.16)
                                                                  -------           -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 11.02           $ 10.65
                                                                  =======           =======
Total Return (Excludes Sales Charge)........................         6.87%(b)          8.22%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $24,509           $ 5,672
  Ratio of expenses to average net assets...................         1.20%(c)          1.22%(c)
  Ratio of net investment income to average net assets......         2.42%(c)          2.93%(c)
  Ratio of expenses to average net assets *.................         1.34%(c)          1.73%(c)
  Ratio of net investment income to average net assets *....         2.28%(c)          2.42%(c)
  Portfolio turnover (d)....................................        12.87%            12.20%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
  34
<PAGE>   37
 
- --------------------------------------------------------------------------------
The One Group Family of Mutual Funds
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                  INVESTOR
                                                                  BALANCED
                                                                    FUND
                                                                ------------
                                                                  CLASS C
                                                                ------------
                                                                 SIX MONTHS
                                                                   ENDED
                                                                DECEMBER 31,
                                                                  1997(a)
                                                                ------------
                                                                (UNAUDITED)
<S>                                                             <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD.......................................      $ 10.63
                                                                  -------
Investment Activities
  Net investment income.....................................         0.14
  Net realized and unrealized gains (losses) from
     investments............................................         0.57
                                                                  -------
     Total from Investment Activities.......................         0.71
                                                                  -------
Distributions
  From net investment income................................        (0.14)
  From net realized gains...................................        (0.22)
                                                                  -------
     Total Distributions....................................        (0.36)
                                                                  -------
NET ASSET VALUE,
  END OF PERIOD.............................................      $ 10.98
                                                                  =======
Total Return (Excludes Sales Charge)........................         6.76%(b)
 
RATIOS/SUPPLEMENTARY DATA:
  Net Assets at end of period (000).........................      $ 2,600
  Ratio of expenses to average net assets...................         1.20%(c)
  Ratio of net investment income to average net assets......         2.42%(c)
  Ratio of expenses to average net assets *.................         1.34%(c)
  Ratio of net investment income to average net assets *....         2.28%(c)
  Portfolio turnover (d)....................................        12.87%
</TABLE>
 
- ------------
 *  During the period, certain fees were voluntarily reduced. If such voluntary
    fee reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Not annualized.
(c) Annualized.
(d) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing among the classes of shares issued.
 
See notes to financial statements.
 
                                                                              35
<PAGE>   38
 
                 (This page has been left blank intentionally.)
<PAGE>   39

Important Customer Information.
Please Read:

Shares of The One Group:
* are not deposits or obligations
  of, or guaranteed by, BANC ONE
  CORPORATION or its affiliates
* are not insured or guaranteed by the 
  FDIC or by any other governmental 
  agency or government-sponsored
  agency of the federal government 
  or any state
* are subject to investment risks,
  including possible loss of the
  principal amount invested.

Banc One Investment Advisors
Corporation, a registered investment 
advisor and an indirect subsidiary of 
BANC ONE CORPORATION, serves 
as an investment advisor to The One
Group, for which it receives advisory 
fees. The One Group is distributed by 
The One Group Services Company, 
3435 Stelzer Road, Columbus,
Ohio 43219, which is not affiliated
with BANC ONE CORPORATION and 
is not a bank. Contact us at our web
site address: www.onegroup.com or
e-mail us at [email protected].

For more complete information on
any of The One Group Funds, including
management fees and expenses,
you may obtain a prospectus from 
The One Group Services Company.
Read the prospectus carefully                                
before investing.                                            

BANC ONE 
INVESTMENT                                                       [LOGO]
ADVISORS
CORPORATION
                                                            TOG-F-036-AN(8/97)


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