CARDINAL GROUP
497, 1995-09-14
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<PAGE>   1
 
                        CARDINAL AGGRESSIVE GROWTH FUND
 
                      SUPPLEMENT DATED SEPTEMBER 15, 1995,
                      TO PROSPECTUS DATED FEBRUARY 1, 1995
 
     Capitalized terms used in this Supplement have the meaning assigned to them
in the Prospectus.
 
     The following paragraph is added to the cover page of the Prospectus:
 
          THE SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
     GUARANTEED OR ENDORSED BY ANY BANK, NOR ARE SUCH SHARES FEDERALLY
     INSURED BY THE U.S. GOVERNMENT, THE FEDERAL DEPOSIT INSURANCE
     CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER GOVERNMENTAL
     AGENCY. AN INVESTMENT IN THE FUND INVOLVES CERTAIN INVESTMENT RISKS,
     INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
     The Annual Fund Operation Expenses and the Example in the Fee Table on page
5 of the Prospectus are deleted and are replaced with the following:
 
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average net assets)
 
<TABLE>
<S>                                                              <C>
Management Fees                                                   .75%
12b-1 Fees After Fee Waiver(1)                                      0
Other Expenses                                                   1.51
                                                                 ----
       Total Fund Operating Expenses
          After Fee Waiver                                       2.26%
                                                                 ====
</TABLE>
 
<TABLE>
<CAPTION>
                      EXAMPLE                           1 YEAR     3 YEARS     5 YEARS     10 YEARS
----------------------------------------------------    ------     -------     -------     --------
<S>                                                     <C>        <C>         <C>         <C>
You would pay the following expenses on a $1,000
  investment, assuming (1) 5% annual return and (2)
  redemption at the end of each time period:             $ 67       $ 112       $ 161        $293
</TABLE>
 
---------------
 
(1) The Ohio Company, as the Fund's distributor, has agreed with the Group to
    waive all of its Rule 12b-1 fees until March 31, 1996. Absent such waiver,
    Rule 12b-1 Fees and Total Fund Operating Expenses would be 0.25% and 2.51%,
    respectively.
 
     The third paragraph under the heading "WHO MANAGES MY INVESTMENT IN THE
FUND? -- Investment Adviser" on page 19 of the Prospectus is deleted in its
entirety and is replaced with the following:
 
     In its capacity as investment adviser, and subject to the ultimate
     authority of the Group's Board of Trustees, the Adviser, in accordance
     with its investment objectives and policies manages the Fund, makes
     decisions with respect to and places orders for all purchases and
     sales of its portfolio securities. Since August, 1995, John Bevilacqua
     has been primarily responsible for the day-to-day management of the
     Fund's portfolio. Mr. Bevilacqua has
 
                                                        (Continued on next page)
<PAGE>   2
 
     been a Vice President and Portfolio Manager for The Ohio Company since
     October, 1994. Prior thereto and since February, 1984, Mr. Bevilacqua
     serves as Second Vice President -- Investments for Midland Mutual Life
     Insurance Company, Columbus, Ohio.
 
     The following sentences are added at the end of the first paragraph under
the heading "Distribution Plan" on page 20 of the Prospectus:
 
     The Ohio Company may from time to time waive all or a portion of the
     fees payable to it pursuant to the Plan. Any such waiver will cause
     the total return of the Fund to be higher than it would otherwise be
     absent such a waiver.
 
     This Prospectus Supplement supersedes in its entirety the Prospectus
Supplement dated February 22, 1995.
 
          INVESTORS SHOULD RETAIN THIS SUPPLEMENT WITH THE PROSPECTUS
                              FOR FUTURE REFERENCE
<PAGE>   3
 
                                  PROSPECTUS

                                    [LOGO]
 
                        CARDINAL AGGRESSIVE GROWTH FUND
 
Cardinal Aggressive Growth Fund (the "Fund") is a diversified investment fund of
The Cardinal Group (the "Group"), an open-end, management investment company.
The Trustees of the Group have divided the Fund's beneficial ownership into an
unlimited number of transferable units called shares (the "Shares").
 
The Fund seeks as its investment objective appreciation of capital. The Fund
intends to invest primarily in common stocks and securities convertible into
common stocks. There can be no assurance that the Fund's objective will be
achieved.
--------------------------------------------------------------------------------
 
          For further information regarding the Fund or for assistance
            in opening an account or redeeming shares, please call:
 
        In Columbus 464-5511 (opening accounts and further information)
 
               From other Ohio locations (800) 282-9446 toll free
 
                   From outside Ohio (800) 848-7734 toll free
 
                  Inquiries may also be made by mail addressed
                      to the Fund at its principal office:
 
                             155 East Broad Street
                              Columbus, Ohio 43215
--------------------------------------------------------------------------------
 
This Prospectus relates only to Cardinal Aggressive Growth Fund, currently one
of two funds of the Group and one of six funds of the Cardinal family of funds.
Interested persons who wish to obtain copies of the prospectus of Cardinal
Balanced Fund, the other fund of the Group, or of The Cardinal Fund Inc.,
Cardinal Government Obligations Fund, Cardinal Government Securities Trust or
Cardinal Tax Exempt Money Trust, the other members of the Cardinal family of
funds, should contact The Ohio Company at the number above. Additional
information about the Fund, contained in a Statement Of Additional Information
dated February 1, 1995, has been filed with the Securities and Exchange
Commission and is incorporated herein by reference. Such Statement is available
upon request without charge from the Fund at the above address or by calling one
of the phone numbers provided above.
 
This Prospectus sets forth concisely the information about the Fund that a
prospective investor ought to know before investing in the Fund. This Prospectus
should be retained for future reference.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                                   [LOGO]
 
                The date of this Prospectus is February 1, 1995
 
--------------------------------------------------------------------------------
<PAGE>   4
 
--------------------------------------------------------------------------------
KEY FEATURES
--------------------------------------------------------------------------------
 
<TABLE>
<S>                              <C>
PROFESSIONAL MANAGERS..........  The Fund's portfolio is fully managed by professional
                                 portfolio managers. (See page 19.)
DIVERSIFICATION................  The Fund's portfolio of securities represents an interest
                                 in many companies and industries and therefore provides a
                                 diversification of risk.
REDUCED SALES CHARGE...........  An investor will pay a reduced sales charge for large
                                 investments. (See page 12.)
LOW INITIAL INVESTMENT.........  An investor can acquire shares of a portfolio of common
                                 stocks and securities convertible into common stocks with
                                 a smaller investment than would be needed to purchase a
                                 similar portfolio directly.
RETIREMENT PROGRAMS............  The Fund is a permissible investment for qualified
                                 retirement plans.
DIVIDEND REINVESTMENT..........  You may reinvest dividends, capital gains or both in
                                 additional shares of the Fund at no charge. (See pages 5
                                 and 14.)
ACH PROCESSING.................  Investors may use Automated Clearing House ("ACH")
                                 processing for subsequent purchases of shares,
                                 redemptions, and/or distributions paid. (See page 16.)
</TABLE>
 
                                        2
<PAGE>   5
 
--------------------------------------------------------------------------------
PROSPECTUS HIGHLIGHTS
--------------------------------------------------------------------------------
 
<TABLE>
<S>                              <C>
SHARES OFFERED.................  Units of beneficial interest without par ("Shares") of
                                 Cardinal Aggressive Growth Fund, a separate investment
                                 portfolio (the "Fund") of The Cardinal Group, an Ohio
                                 business trust (the "Group"). (See page 7.)
OFFERING PRICE & SALES
  CHARGE.......................  The public offering price is equal to net asset value per
                                 share plus a sales charge equal to 4.50% of the public
                                 offering price (4.71% of net amount invested) reduced on
                                 investments of $100,000 or more. (See page 12.)
MINIMUM PURCHASE...............  $1,000 minimum initial investment and $50 minimum subse-
                                 quent investments. (See page 12.)
TYPE OF COMPANY................  The Fund is a diversified series of an open-end,
                                 management investment company, organized as an Ohio
                                 business trust. (See page 7.)
INVESTMENT OBJECTIVE...........  Appreciation of capital. (See page 7.)
INVESTMENT POLICIES............  The Fund will invest primarily in common stocks and
                                 securities convertible into common stocks of
                                 growth-oriented companies. (See pages 7 and 8.)
RISK FACTORS AND SPECIAL
  CONSIDERATIONS...............  An investment in a mutual fund such as the Fund involves
                                 a certain amount of risk and may not be suitable for all
                                 investors. Some investment policies of the Fund may
                                 entail certain risks. (See "WHAT ARE THE INVESTMENT
                                 OBJECTIVES AND POLICIES OF THE FUND? -- Risk Factors and
                                 Investment Techniques" on pages 8 through 10.)
INVESTMENT ADVISER AND
  MANAGER......................  The Fund has entered into an Investment Advisory and
                                 Management Agreement with Cardinal Management Corp., a
                                 wholly-owned subsidiary of The Ohio Company (the "Ad-
                                 viser"). The Adviser also serves as investment adviser to
                                 Cardinal Balanced Fund, another fund of the Group. (See
                                 page 19.)
</TABLE>
 
                                        3
<PAGE>   6
 
<TABLE>
<S>                              <C>
MANAGEMENT FEE.................  The annual rate is .75% of the average daily net assets
                                 of the Fund. (See pages 19 and 20.)
DISTRIBUTIONS..................  Dividends and distributions are made with such frequency
                                 as the Fund shall determine. (See page 14.)
REDEMPTION.....................  At net asset value per share without charge, except that
                                 broker-dealers may charge a service fee for assisting in
                                 a redemption. (See page 15.)
TRANSFER AGENT.................  Cardinal Management Corp. (the "Transfer Agent"). (See
                                 page 20.)
</TABLE>
 
                                        4
<PAGE>   7
 
--------------------------------------------------------------------------------
FEE TABLE
--------------------------------------------------------------------------------
 
<TABLE>
     <S>                                                                          <C>
     SHAREHOLDER TRANSACTION EXPENSES
               Maximum Sales Load Imposed on Purchases
                 (as a percentage of offering price)..........................           4.50%
               Maximum Sales Load Imposed on Reinvested Dividends
                 (as a percentage of offering price)..........................              0%
               Deferred Sales Load
                 (as a percentage of original purchase price or redemption
                proceeds, as applicable)......................................              0%
               Redemption Fees
                 (as a percentage of amount redeemed, if applicable)..........              0%
               Exchange Fee...................................................             $0
     ANNUAL FUND OPERATING EXPENSES
       (as a percentage of average net assets)
               Management Fees................................................            .75%
               12b-1 Fees.....................................................            .25
               Other Expenses.................................................           1.51
                                                                                     --------
               Total Fund Operating Expenses..................................           2.51%
                                                                                     ========
</TABLE>
 
<TABLE>
<CAPTION>
                   EXAMPLE                         1 YEAR        3 YEARS        5 YEARS        10 YEARS
---------------------------------------------    ----------     ----------     ----------     ----------
<S>                                              <C>            <C>            <C>            <C>
You would pay the following expenses on a
$1,000 investment, assuming (1) 5% annual
return and (2) redemption at the end of each
time period:.................................       $ 69           $120           $173           $317
</TABLE>
 
The purpose of the above table is to assist a potential purchaser of the Fund's
Shares in understanding the various costs and expenses that an investor in the
Fund will bear directly or indirectly. See "WHO MANAGES MY INVESTMENT IN THE
FUND?" for a more complete discussion of the shareholder transaction expenses
and annual operating expenses of the Fund. The example and expenses above
reflect current fees. THE FOREGOING EXAMPLE SHOULD NOT BE CONSIDERED A
REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL EXPENSES MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
                                        5
<PAGE>   8
 
--------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
--------------------------------------------------------------------------------
 
The following Financial Highlights with respect to the fiscal year ended
September 30, 1994, and the period from June 24, 1993, through September 30,
1993, have been audited by KPMG Peat Marwick LLP, independent auditors, whose
report thereon, together with certain financial statements, are contained in the
Fund's Statement of Additional Information and which may be obtained by
shareholders and prospective investors.
 
FINANCIAL HIGHLIGHTS FOR EACH SHARE OF BENEFICIAL INTEREST
OUTSTANDING THROUGHOUT EACH PERIOD:
 
<TABLE>
<CAPTION>
                                                                                     PERIOD FROM
                                                                                    JUNE 24, 1993
                                                                                      (DATE OF
                                                                                   COMMENCEMENT OF
                                                                                     OPERATIONS)
                                                                                       THROUGH
                                                                YEAR ENDED          SEPTEMBER 30,
                                                            SEPTEMBER 30, 1994          1993*
                                                           --------------------    ---------------
     <S>                                                   <C>                     <C>
     Net asset value, Beginning of period...............          $10.47               $ 10.00
     Income (loss) from investment operations:
       Net investment loss..............................           (0.13)                (0.03)
       Net gains or losses on securities (both realized
          and unrealized)...............................           (0.36)                 0.50
                                                                  ------               -------
       Total from investment operations.................           (0.49)                 0.47
                                                                  ------               -------
     Less Distributions:
       Dividends (from net investment loss).............              --                    --
       Distributions (from capital gains)...............           (0.04)                   --
       Returns of capital...............................              --                    --
                                                                  ------               -------
       Total Distributions..............................           (0.04)                 0.00
                                                                  ------               -------
     Net asset value, End of period.....................          $ 9.94               $ 10.47
                                                                  ======               =======
     Ratios/Supplemental Data:
       Total Return.....................................           (4.74%)                4.70%**
       Net assets, End of period (000) omitted..........          $9,460               $ 6,320
       Ratio of expenses to average net assets..........            2.51%                 0.91%
       Ratio of net investment income to average net
          assets........................................           (1.50%)               (0.53%)
       Portfolio Turnover Rate..........................           95.70%                31.15%
</TABLE>
 
---------------
 
 *Commencement of operations.
 
**This total return figure reflects aggregate total return. Aggregate total
  return is calculated similarly to average annual total return except that the
  return figure is aggregated over the relevant period instead of annualized.
 
See notes to financial statements appearing in the Fund's Statement of
Additional Information.
 
                                        6
<PAGE>   9
 
--------------------------------------------------------------------------------
PERFORMANCE INFORMATION
--------------------------------------------------------------------------------
 
From time to time the Fund may advertise its average annual total return and/or
cumulative total return. SUCH TOTAL RETURN FIGURES ARE BASED UPON HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE PERFORMANCE. The average annual
total return advertised by the Fund refers to the return generated by an
investment in the Fund over certain specified periods since the establishment of
the Fund. The average annual total return over a period equates the amount of an
initial investment in the Fund to the amount redeemable at the end of that
period assuming that any dividends and distributions earned by an investment in
the Fund are immediately reinvested and the maximum applicable sales charge
(currently 4.5%) is deducted from the initial investment at the time of
investment. The cumulative return advertised refers to the total return on a
hypothetical investment over the relevant period and equates the amount of an
initial investment in the Fund to the amount redeemable at the end of that
period assuming that any dividends and distributions are immediately reinvested
and the maximum sales charge is deducted from the initial investment. If the
sales charge were not deducted, the average annual total return and cumulative
total return advertised would be higher.
 
Investors may also judge the performance of the Fund by comparing or referencing
its performance to the performance of other mutual funds or mutual fund
portfolios with comparable investment objectives and policies through various
mutual fund or market indices such as those prepared by Dow Jones & Co., Inc.,
and Standard & Poor's Corporation, and to data prepared by Lipper Analytical
Services, Inc., Morningstar, Inc. and CDA Investment Technologies, Inc.
Comparisons may also be made to indices or data published in Money Magazine,
Forbes, Barron's, The Wall Street Journal, The New York Times, The Columbus
Dispatch, Business Week, U.S.A. Today and Consumer Reports. In addition to
performance information, general information about the Fund that appears in a
publication such as those mentioned above may be included in advertisements and
in reports to shareholders.
 
Further information about the performance of the Fund is contained in the Fund's
Annual Report to Shareholders which may be obtained without charge by contacting
the Fund at the telephone numbers set forth on the cover page of this
Prospectus.
 
--------------------------------------------------------------------------------
WHAT IS THE FUND?
--------------------------------------------------------------------------------
 
The Fund is one separate diversified investment fund of the Group, which was
organized on March 23, 1993, as an Ohio business trust. The Group is registered
and operates as an open-end management investment company as defined in the
Investment Company Act of 1940, as amended (the "1940 Act").
 
--------------------------------------------------------------------------------
WHAT ARE THE INVESTMENT OBJECTIVES AND POLICIES OF THE FUND?
--------------------------------------------------------------------------------
 
IN GENERAL
 
The investment objective of the Fund is to seek appreciation of capital. The
Fund will invest primarily in common stocks and securities convertible into
common stocks of growth oriented companies. The investment objective of the Fund
is a fundamental policy and as such may not be changed without a vote of the
holders of a majority of the outstanding Shares of the Fund (as defined below
under "WHAT ARE MY RIGHTS AS A SHAREHOLDER?"). There can be no assurance that
the investment objective of the Fund will be achieved.
 
In determining the securities to be purchased by the Fund, emphasis will be
placed on securities of companies which, in the opinion of the Adviser, are
growth oriented and exhibit the potential for above-average growth in earnings.
The securities to be purchased by the Fund are traded either in established
over-the-counter markets or on national exchanges and are issued by companies
having a market capitalization of at least $10 million.
 
                                        7
<PAGE>   10
 
The Adviser will select convertible securities primarily upon its evaluation
that the underlying common stocks meet the criteria for selection of common
stocks as described above. The Fund may invest up to 10% of its net assets in
non-investment grade convertible debt securities rated no lower than B by an
appropriate nationally recognized statistical rating organization (an "NRSRO")
or in unrated securities which are deemed by the Adviser to be of comparable
quality. Non-investment grade securities are commonly referred to as high yield
or high risk securities. High yield, high risk securities are generally riskier
than higher quality securities and are subject to more credit risk, including
risk of default, and volatility than higher quality securities. In addition,
such securities may have less liquidity and experience more price fluctuation
than higher quality securities.
 
Convertible debt securities which are rated B by Moody's Investor Services
generally lack characteristics of desirable investment, since the assurance of
interest and principle payments or maintenance of other terms of the contract
over any long period of time may be small. Debt rated B by Standard & Poor's
Corporation is regarded, on balance, as predominantly speculative with respect
to capacity to pay interest and repay principal in accordance with the terms of
the obligation. While such debt will likely have some quality and protective
characteristics, these are outweighed by large uncertainties or major risk
exposures to adverse conditions. In the event that a convertible debt security's
rating falls below a "B" by the appropriate NRSROs, the Adviser will reevaluate
the security in order to determine whether to sell or convert, if possible, such
security. In such an event, however, the Fund would not be required to liquidate
such security if it would suffer a loss on the sale of such security.
 
The Fund will, under normal market conditions, be invested fully in common
stocks and securities convertible into common stocks and may engage in the
investment techniques more fully described below. However, for cash management
purposes the Adviser may invest a portion of the Fund's assets in short-term
fixed income securities, consisting of commercial paper, bankers' acceptances,
certificates of deposit, obligations issued or guaranteed by the U.S. Government
or its agencies or instrumentalities, demand and time deposits of domestic
banks, repurchase agreements and securities of other investment companies, as
described below. During temporary defensive periods, as determined by the
Adviser, the Fund may hold up to 100% of its total assets in such short-term,
fixed income securities. However, to the extent that the Fund is so invested,
the Fund is not pursuing and may not achieve its investment objective.
 
RISK FACTORS AND INVESTMENT TECHNIQUES
 
GENERAL. Like any investment program, an investment in the Fund entails certain
risks. The Fund is intended for investors who can accept the higher risks
involved in seeking potentially higher capital appreciation through investments
in growth oriented companies. A growth oriented company typically invests most
of its net income in its enterprise and does not pay out much, if any, in
dividends. Accordingly, the Fund does not anticipate any significant
distributions to shareholders from net investment income, and potential
investors should be in a financial position to forego current income from their
investment in this Fund. The securities of less seasoned companies may have
limited marketability and may be subject to more abrupt or erratic market
movements over time than securities of more seasoned companies or the market as
a whole.
 
As described below, the Fund may invest in put and call options and futures.
Such instruments are considered to be derivatives. A derivative is generally
defined as an instrument whose value is based upon, or derived from, some
underlying index, reference rate (e.g., interest rates), security, commodity or
other asset. The Fund will not invest more than 10% of its total assets in such
derivatives at any one time.
 
REPURCHASE AGREEMENTS. Securities held by the Fund may be subject to repurchase
agreements. Under the terms of the repurchase agreement, the Fund would acquire
securities from a financial institution such as a well-established securities
dealer or a bank which is a member of the Federal Reserve System which the
Adviser deems creditworthy under guidelines approved by the Group's Board of
Trustees. At the time of purchase, the bank or securities dealer agrees to
repurchase the underlying securities from the Fund at a specified time and
price. The resale price reflects the purchase price plus an agreed upon market
rate of
 
                                        8
<PAGE>   11
 
interest which is unrelated to the coupon rate or maturity of the underlying
security. Under the 1940 Act, repurchase agreements are considered to be loans
by the Fund. The Fund will only enter into a repurchase agreement where (i) the
underlying securities are of the type which the Fund's investment policies would
allow it to purchase directly, (ii) the market value of the underlying security,
including interest accrued, will at all times be equal to or exceed the value of
the repurchase agreement, and (iii) payment for the underlying securities is
made only upon physical delivery or evidence of bookentry transfer to the
account of the Fund's custodian or a bank acting as agent. The Adviser will be
responsible for continuously monitoring such requirements. In the event of a
bankruptcy or other default of a seller of a repurchase agreement, the Fund
could experience both delays in liquidating the underlying securities and
losses, including: (a) possible decline in the value of the underlying
securities during the period while the Fund seeks to enforce its rights thereto;
(b) possible subnormal levels of income and lack of access to income during this
period; and (c) expenses of enforcing its rights.
 
FOREIGN SECURITIES. The Fund may also invest up to 25% of its net assets in
foreign securities through the purchase of sponsored and unsponsored American
Depositary Receipts ("ADRs"). Unsponsored ADRs may be less liquid than sponsored
ADRs, and there may be less information available regarding the underlying
foreign issues for unsponsored ADRs. Investment in foreign securities is subject
to special investment risks that differ in some respects from those related to
investments in securities of U.S. domestic issuers. Such risks include trade
balances and imbalances, and related economic policies, future adverse
political, economic and social developments, the possible imposition of
withholding taxes on interest income, possible seizure, nationalization, or
expropriation of foreign investments or deposits, less stringent disclosure
requirements, the possible establishment of exchange controls or taxation at the
source, or the adoption of other foreign governmental restrictions. In addition,
foreign issuers may be subject to different accounting, auditing, reporting, and
recordkeeping standards than those applicable to U.S. domestic issuers, and
securities markets in foreign countries may be structured differently from and
may not be as liquid as the U.S. markets. The Fund will acquire securities
issued by foreign issuers only when the Adviser believes that the risks
associated with such investments are minimal.
 
PUT AND CALL OPTIONS. Subject to its investment policies and for purposes of
hedging against market risks related to its portfolio securities, the Fund may
purchase put and call options on securities. Purchasing options is a specialized
investment technique that entails a substantial risk of a complete loss of the
amounts paid as premiums to writers of options. The Fund will purchase put
options only on securities in which the Fund may otherwise invest. The Fund may
also engage in writing call options from time to time as the Adviser deems
appropriate. The Fund will write only covered call options (options on
securities owned by the Fund). In order to close out a call option it has
written, the Fund will enter into a "closing purchase transaction" -- the
purchase of a call option on the same security with the same exercise price and
expiration date as the call option which the Fund previously has written. When a
portfolio security subject to a call option is sold, the Fund will effect a
closing purchase transaction to close out any existing call option on that
security. If the Fund is unable to effect a closing purchase transaction, it
will not be able to sell the underlying security until the option expires or the
Fund delivers the underlying security upon exercise. Under normal market
conditions, it is not expected that the underlying value of portfolio securities
subject to such options would exceed .25% of the net assets of the Fund.
 
The Fund, as part of its option transactions, also may purchase index put and
call options and write index options. As with options on individual securities,
the Fund will write only covered index call options. Through the writing or
purchase of index options the Fund can achieve many of the same objectives as
through the use of options on individual securities. Options on securities
indices are similar to options on a security except that, rather than the right
to take or make delivery of a security at a specified price, an option on a
securities index gives the holder the right to receive, upon exercise of the
option, an amount of cash if the closing level of the securities index upon
which the option is based is greater than, in the case of a call, or less than,
in the case of a put, the exercise price of the option.
 
Price movements in securities which the Fund owns or intends to purchase
probably will not correlate perfectly with movements in the level of an index
and, therefore, the Fund bears the risk of a loss on an
 
                                        9
<PAGE>   12
 
index option that is not completely offset by movements in the price of such
securities. Because index options are settled in cash, a call writer cannot
determine the amount of its settlement obligations in advance and, unlike call
writing on specific securities, cannot provide in advance for, or cover, its
potential settlement obligations by acquiring and holding the underlying
securities. The Fund may be required to segregate assets or provide an initial
margin to cover index options that would require it to pay cash upon exercise.
 
FUTURES CONTRACTS. The Fund may also enter into contracts for the future
delivery of securities and futures contracts based on a specific security, class
of securities or an index, purchase or sell options on any such futures
contracts and engage in related closing transactions. A futures contract on a
securities index is an agreement obligating either party to pay, and entitling
the other party to receive, while the contract is outstanding, cash payments
based on the level of a specified securities index.
 
The Fund may engage in such futures contracts in an effort to hedge against
market risks. For example, when market values of portfolio securities are
expected to fall, the Fund can seek through the sale of futures contracts to
offset a decline in the value of its portfolio securities. When market values
are expected to rise, the Fund, through the purchase of such contracts, can
attempt to secure better prices for the Fund than might later be available in
the market when it effects anticipated purchases.
 
The acquisition of put and call options on futures contracts will, respectively,
give the Fund the right (but not the obligation), for a specified price, to sell
or to purchase the underlying futures contract, upon exercise of the option, at
any time during the option period.
 
Aggregate initial margin deposits for futures contracts, and premiums paid for
related options, may not exceed five percent of the Fund's total assets, and the
value of securities that are the subject of such futures and options (both for
receipt and delivery) may not exceed one-third of the market value of the Fund's
total assets. Futures transactions will be limited to the extent necessary to
maintain the Fund's qualification as a regulated investment company.
 
Futures transactions involve brokerage costs and require the Fund to segregate
assets to cover contracts that would require it to purchase securities. The Fund
may lose the expected benefit of futures transactions if securities prices move
in an unanticipated manner. Such unanticipated changes may also result in poorer
overall performance than if the Fund had not entered into any futures
transactions. In addition, the value of the Fund's futures positions may not
prove to be perfectly or even highly correlated with the value of its portfolio
securities, limiting the Fund's ability to hedge effectively against market risk
and giving rise to additional risks. There is no assurance of liquidity in the
secondary market for purposes of closing out futures positions.
 
INVESTMENT COMPANY SECURITIES.  The Fund may also invest up to 10% of the value
of its total assets in the securities of other investment companies subject to
the limitations set forth in the 1940 Act. The Fund intends to invest in the
securities of money market mutual funds for purposes of short-term cash
management. The Fund's investment in such other investment companies may result
in the duplication of fees and expenses, particularly investment advisory fees.
For a further discussion of the limitations on the Fund's investments in other
investment companies, see "INVESTMENT OBJECTIVES AND POLICIES -- Additional
Information on Portfolio Instruments -- Securities of Other Investment
Companies" in the Group's Statement of Additional Information.
 
PORTFOLIO TURNOVER
 
The portfolio turnover rate for the Fund is calculated by dividing the lesser of
the Fund's purchases or sales of portfolio securities for the year by the
monthly average value of the portfolio securities. The Securities and Exchange
Commission requires that the calculation exclude all securities whose remaining
maturities at the time of acquisition are one year or less. The portfolio
turnover rate for the Fund may vary greatly from year to year, as well as within
a particular year and may also be affected by cash requirements for redemptions
of Shares. High portfolio turnover rates will generally result in higher
transaction costs,
 
                                       10
<PAGE>   13
 
including brokerage commissions, to the Fund and may result in additional tax
consequences to the Fund's Shareholders. Portfolio turnover will not be a
limiting factor in making investment decisions.
 
INVESTMENT RESTRICTIONS
 
The Fund is subject to a number of investment restrictions that may be changed
only by a vote of a majority of the outstanding Shares of the Fund (as defined
below under "WHAT ARE MY RIGHTS AS A SHAREHOLDER?").
 
The Fund will not:
 
     1. Purchase securities of any one issuer, other than obligations issued or
        guaranteed by the U.S. Government or its agencies or instrumentalities,
        if, immediately after such purchase, more than 5% of the value of the
        Fund's total assets would be invested in such issuer, or the Fund would
        hold more than 10% of the outstanding voting securities of the issuer,
        except that up to 25% of the value of the Fund's total assets may be
        invested without regard to such limitations. There is no limit to the
        percentage of assets that may be invested in U.S. Treasury bills, notes,
        or other obligations issued or guaranteed by the U.S. Government or its
        agencies or instrumentalities.
 
     2. Purchase any securities which would cause more than 25% of the value of
        the Fund's total assets at the time of purchase to be invested in
        securities of one or more issuers conducting their principal business
        activities in the same industry, provided that: (a) there is no
        limitation with respect to obligations issued or guaranteed by the U.S.
        Government or its agencies or instrumentalities and repurchase
        agreements secured by obligations of the U.S. Government or its agencies
        or instrumentalities; (b) wholly owned finance companies will be
        considered to be in the industries of their parents if their activities
        are primarily related to financing the activities of their parents; and
        (c) utilities will be divided according to their services. For example,
        gas, gas transmission, electric and gas, electric, and telephone will
        each be considered a separate industry.
 
     3. Borrow money or issue senior securities, except that the Fund may borrow
        from banks or enter into reverse repurchase agreements or dollar roll
        agreements for temporary purposes in amounts up to 10% of the value of
        its total assets at the time of such borrowing and except as permitted
        pursuant to an exemption from the 1940 Act. The Fund will not purchase
        securities while its borrowings (including reverse repurchase agreements
        and dollar roll agreements) exceed 5% of its total assets.
 
     4. Make loans, except that the Fund may purchase or hold debt instruments
        and lend portfolio securities in accordance with its investment
        objective and policies, make time deposits with financial institutions
        and enter into repurchase agreements.
 
The following additional investment restriction may be changed without the vote
of a majority of the outstanding Shares of the Fund.
 
The Fund may not:
 
     1. Purchase or otherwise acquire any securities, if as a result, more than
        15% of the Fund's net assets would be invested in securities that are
        illiquid.
 
The Group, however, has represented to the Wisconsin Securities Bureau, on
behalf of the Fund, that so long as the Shares of the Fund are registered for
sale in the State of Wisconsin, the Fund will limit its investment in certain
securities which may not be sold to the public without being registered under
the Securities Act of 1933, as amended, to not more than 5% of its total assets.
For more information regarding such representations, see "INVESTMENT OBJECTIVES
AND POLICIES -- Investment Restrictions" in the Statement of Additional
Information.
 
                                       11
<PAGE>   14
 
--------------------------------------------------------------------------------
HOW DO I PURCHASE SHARES OF THE FUND?
--------------------------------------------------------------------------------
 
IN GENERAL
 
The Fund's Shares may be purchased at the public offering price, as described
below under "Public Offering Price," through The Ohio Company, principal
underwriter of the Fund's Shares, at its address and telephone number set forth
on the cover page of this Prospectus, and through other broker-dealers who are
members of the National Association of Securities Dealers, Inc. and have sales
agreements with The Ohio Company.
 
Subsequent purchases of Shares of the Fund may be made by ACH processing as
described under "WHAT OTHER SHAREHOLDER PROGRAMS ARE PROVIDED? -- ACH
Processing" below. In addition, if an Account Information Form has previously
been received by The Ohio Company, Shares may also be purchased by wiring funds
to the Fund's custodian. Prior to wiring any such funds and in order to ensure
that wire orders are invested properly, you must call The Ohio Company to obtain
the necessary instructions and information.
 
The minimum initial investment for individuals is $1,000, except the initial
investment for an applicant investing by means of the Automatic Investment Plan,
as described below, must be at least $50. Subsequent investments must be in
amounts of at least $50.
 
The Group reserves the right to reject any order for the purchase of Shares in
whole or in part. You will receive a confirmation of each new transaction in
your account, which will also show the total number of Shares owned by you and
the number of Shares being held in safekeeping by the Transfer Agent for your
account. Certificates representing Shares will not be issued.
 
PUBLIC OFFERING PRICE
 
The public offering price of Shares of the Fund is the net asset value per share
(see "HOW IS NET ASSET VALUE CALCULATED?") next determined after receipt by The
Ohio Company, its agents or broker-dealers with whom it has an agreement, of an
order and payment, plus a sales charge as follows:
 
<TABLE>
<CAPTION>
                                                          SALES CHARGE          AS A PERCENTAGE
                                                              AS A             OF OFFERING PRICE
                                                           PERCENTAGE       ------------------------
                        AMOUNT OF                          OF THE NET         SALES        DEALER'S
                   SINGLE TRANSACTION                    AMOUNT INVESTED      CHARGE      CONCESSION
                   ------------------                    ---------------    ----------    ----------
   <S>                                                   <C>                <C>           <C>
   Less than $100,000.................................         4.71%            4.50%         4.00%
   $100,000 but less than $250,000....................         3.63             3.50          3.00
   $250,000 but less than $500,000....................         2.56             2.50          2.00
   $500,000 but less than $1,000,000..................         1.52             1.50          1.00
   $1,000,000 or more.................................         0.50             0.50          0.40
</TABLE>
 
(See "HOW IS NET ASSET VALUE CALCULATED?" for a description of the computation
of net asset value per share.)
 
The above charges on investments of $100,000 or more are applicable to purchases
made at one time by an individual, or an individual, his spouse and their
children not of legal age, or a trustee, guardian or other like fiduciary of
certain single trust estates or certain single fiduciary accounts.
 
No sales charge is imposed on purchases of Shares by officers, trustees, and
employees of the Group, or by full-time employees of The Ohio Company or the
Adviser, who have been such for at least 90 days or by qualified retirement
plans for such persons.
 
                                       12
<PAGE>   15
 
AUTOMATIC INVESTMENT PLAN
 
The Fund has made arrangements to enable you to make automatic monthly or
quarterly investments, in the minimum amount of $50 per transaction, from your
checking account. Assuming the cooperation of your financial institution, your
checking account therein will be debited to purchase Shares of the Fund on the
periodic basis you select. Confirmation of your purchase of Fund Shares will be
provided by the Transfer Agent. The debit of your checking account will be
reflected in the checking account statement you receive from your financial
institution. Please contact The Ohio Company for the appropriate form.
 
--------------------------------------------------------------------------------
MAY MY TAX SHELTERED RETIREMENT PLAN INVEST IN THE FUND?
--------------------------------------------------------------------------------
 
Shares of the Fund qualify for purchase in connection with the following tax
sheltered retirement plans:
 
     --  Individual retirement account ("IRAs") plans.
 
     --  Simplified Employee Pension Plans.
 
     --  403(b)(7) Custodial Plans sponsored by certain tax-exempt
         employers.
 
     --  Pension, profit-sharing and 401(k) plans qualifying under Section
         401(a) of the Internal Revenue Code.
 
The Ohio Company offers a wide range of services to assist employers in reducing
the cost and complexity of utilizing any of the above retirement programs. These
services include:
 
             Consulting services
             Prototype plan documents
             Low-cost recordkeeping and IRS reporting
             On-going employee educational programs
             Investment consultation
             Trust services
 
Please contact your local office of The Ohio Company or call 1-800-237-2169
(inside Ohio) or 1-800-237-2170 (outside Ohio) to obtain complete information
regarding The Ohio Company's retirement plan services.
 
--------------------------------------------------------------------------------
HOW MAY I QUALIFY FOR QUANTITY DISCOUNTS?
--------------------------------------------------------------------------------
 
LETTER OF INTENTION
 
If you (including your spouse and children not of legal age) intend to purchase
$100,000 or more of Shares of the Fund and of any other Cardinal Fund sold with
a sales charge (a "Cardinal Load Fund") during any 13-month period you may sign
a letter of intention to that effect obtained from The Ohio Company and pay the
reduced sales charge applicable to the total amount of shares to be so
purchased. The 13-month period during which the Letter of Intention is in effect
will begin on the date of the earliest purchase to be included. In addition,
trustees, guardians or other like fiduciaries of single trust estates or certain
single fiduciary accounts may take advantage of the quantity discounts pursuant
to a letter of intention.
 
A letter of intention is not a binding obligation upon you to purchase the full
amount indicated. Shares purchased with the first 5% of such amount will be held
in escrow (while remaining registered in your name) to secure payment of the
higher sales charge applicable to the shares actually purchased. If the full
amount indicated is not purchased, such escrowed shares will be involuntarily
redeemed to pay the additional sales charge, if necessary. Dividends on escrowed
shares, whether paid in cash or reinvested in additional shares of the
applicable Cardinal Load Fund, are not subject to escrow. The escrowed shares
will not be available for disposal by you until all purchases pursuant to the
letter of intention have been made or the higher sales charge has been paid.
When the full amount indicated has been purchased, the escrow will be released.
To the extent that you purchase more than the dollar amount indicated on the
Letter of
 
                                       13
<PAGE>   16
 
Intention and qualify for a further reduced sales charge, the sales charge will
be adjusted for the entire amount purchased at the end of the 13-month period.
The difference in sales charge will be, as you instruct, either delivered to you
in cash or used to purchase additional shares of the Cardinal Load Fund
designated by you subject to the rate of sales charge applicable to the actual
amount of the aggregate purchases. This program, however, may be modified or
eliminated at any time or from time to time by the Group without notice.
 
CONCURRENT PURCHASES
 
For purposes of qualifying for a lower sales charge, you have the privilege of
combining "concurrent purchases" of Shares of the Fund and of one or more of the
other Cardinal Load Funds. For example, if you concurrently purchase Shares of
the Fund at the total public offering price of $50,000 and shares of another
Cardinal Load Fund at the total public offering price of $50,000, the sales
charge would be that applicable to a $100,000 purchase as shown in the table
above. "Concurrent purchases," as described above, shall include the combined
purchases to you, your spouse and your children not of legal age. To receive the
applicable public offering price pursuant to this privilege, you must, at the
time of purchase, give The Ohio Company sufficient information to permit
confirmation of qualification. This privilege, however, may be modified or
eliminated at any time or from time to time by the Group without notice thereof.
 
RIGHTS OF ACCUMULATION
 
After your initial purchase of Shares you may also be eligible to pay a reduced
sales charge for your subsequent purchases of Shares where the total public
offering price of Shares then being purchased plus the then aggregate current
net asset value of Shares of the Fund and of shares of any other Cardinal Load
Fund held in your account equals $100,000 or more. You would be able to purchase
Shares at the public offering price applicable to the total of (a) the total
public offering price of the Shares of the Fund then being purchased plus (b)
the then current net asset value of Shares of the Fund and of shares of any
other Cardinal Load Fund held in your account. For purposes of determining the
aggregate current net asset value of shares held in your account, you may
include Shares then owned by your spouse and children not of legal age.
 
You may obtain additional information about the foregoing special purchase
method from The Ohio Company. You are responsible for notifying The Ohio Company
at the time of purchase when purchases may be accumulated to take advantage of
the reduced sales charge. This program, however, may be modified or eliminated
at any time or from time to time by the Group without notice thereof.
 
--------------------------------------------------------------------------------
WHAT DISTRIBUTIONS WILL I RECEIVE?
--------------------------------------------------------------------------------
 
Dividends and distributions shall generally be paid quarterly (long term capital
gains normally will be distributed only once annually) and in such amounts as
the Fund from time to time shall determine and from net income and net realized
capital gains of the Fund. It is the policy of the Fund to distribute, at least
annually, substantially all of its net investment income and to distribute
annually any net realized capital gains. Unless a shareholder specifically
requests otherwise in writing to the Transfer Agent, dividends and distributions
will be made only in additional full and fractional Shares of the Fund and not
in cash. Dividends are paid in cash not later than seven days after a
shareholder's complete redemption of his Shares in the Fund.
 
Shareholders may also elect to receive dividends and distributions in cash by
using ACH processing as described under "WHAT OTHER SHAREHOLDER PROGRAMS ARE
PROVIDED? -- ACH Processing" below.
 
                                       14
<PAGE>   17
 
--------------------------------------------------------------------------------
HOW MAY I REDEEM MY SHARES?
--------------------------------------------------------------------------------
 
Investors may redeem Shares of the Fund at the net asset value per share next
determined following the receipt by the Fund's transfer agent, Cardinal
Management Corp. (the "Transfer Agent"), 215 East Capital Street, Columbus, Ohio
43215, of written or telephonic notice to redeem, as described more fully below.
See "HOW IS NET ASSET VALUE CALCULATED?", below, for a description of when net
asset value is determined.
 
As requested, The Ohio Company, on behalf of a shareholder, will forward the
foregoing notice to redeem to the Transfer Agent without charge. Other
broker-dealers may assist a shareholder in redeeming his Shares and may charge a
fee for such services.
 
The Group will make payment for redeemed Shares as promptly as practicable but
in no event more than seven days after receipt by the Transfer Agent of the
foregoing notice. The Group reserves the right to delay payment for the
redemption of Shares where such Shares were purchased with other than
immediately available funds, but only until the purchase payment has cleared
(which may take fifteen or more days from the date the purchase payment is
received by the Fund). The purchase of Fund Shares by wire transfer of federal
funds would avoid any such delay.
 
The Group intends to pay cash for all Shares redeemed, but, under abnormal
conditions which make payment in cash unwise, the Group may make payment wholly
or partly in portfolio securities at their then market value equal to the
redemption price. In such cases, an investor may incur brokerage costs in
converting such securities to cash.
 
The Group may suspend the right of redemption or may delay payment during any
period the determination of net asset value is suspended. See "HOW IS NET ASSET
VALUE CALCULATED?".
 
Due to the high cost of maintaining accounts, the Group reserves the right to
redeem, at net asset value, involuntarily Shares in any account at the then
current net asset value if at any time redemptions (but not as a result of a
decrease in the market price of such Shares or the deduction of any sales
charge) have reduced a shareholder's total investment in the Fund to a net asset
value below $500. A shareholder will be notified in writing that the value of
Fund Shares in the account is less than $500 and allowed 30 days to increase his
investment in the Fund to $500 before the redemption is processed. Proceeds of
redemptions so processed, including dividends declared to the date of
redemption, will be promptly paid to the shareholder.
 
REDEMPTION BY MAIL
 
Shareholders may elect to redeem Shares of the Fund by submitting a written
request therefor to the Transfer Agent at 215 East Capital Street, Columbus,
Ohio 43215. The Transfer Agent will request a signature guarantee by an eligible
guarantor institution as described below. However, a signature guarantee will
not be required if (1) the redemption check is payable to the Shareholder(s) of
record, and (2) the redemption check is mailed to the Shareholder(s) at the
address of record, provided, however, that the address of record has not been
changed within the preceding 15 days. For purposes of this policy, an "eligible
guarantor institution" shall include banks, brokers, dealers, credit unions,
securities exchanges and associations, clearing agencies and savings
associations as those terms are defined in the Securities Exchange Act of 1934.
The Transfer Agent reserves the right to reject any signature guarantee if (1)
it has reason to believe that the signature is not genuine or (2) it has reason
to believe that the transaction would otherwise be improper.
 
REDEMPTION BY TELEPHONE
 
Shareholders may elect to redeem Shares of the Fund by calling the Group at the
telephone numbers set forth on the front of this Prospectus. The Shareholder may
direct that the redemption proceeds be mailed to the address of record.
 
                                       15
<PAGE>   18
 
Neither the Group, the Fund nor its service providers will be liable for any
loss, damages, expense or cost arising out of any telephone redemption effected
in accordance with the Group's telephone redemption procedures, acting upon
instructions reasonably believed to be genuine. The Group will employ procedures
designed to provide reasonable assurances that instructions by telephone are
genuine; if these procedures are not followed, the Group, the Fund or its
service providers may be liable for any losses due to unauthorized or fraudulent
instructions. These procedures may include recording all phone conversations,
sending confirmations to Shareholders within 72 hours of the telephone
transaction, and verification of account name and account number or tax
identification number. If, due to temporary adverse conditions, investors are
unable to effect telephone transactions, Shareholders may also redeem their
Shares by mail as described above.
 
AUTOMATIC WITHDRAWAL
 
Shareholders may elect to have the proceeds from redemptions of Shares
transmitted to an authorized bank account at a Federal Reserve member bank
through ACH processing as described under "WHAT OTHER SHAREHOLDER PROGRAMS ARE
PROVIDED? -- ACH Processing" below.
 
SYSTEMATIC WITHDRAWAL PLAN
 
If you are the owner of Shares of the Fund having a total value of $10,000 or
more at the current net asset value, you may elect to redeem your Shares monthly
or quarterly in amounts of $50 or more, pursuant to the Fund's Systematic
Withdrawal Plan. Please contact The Ohio Company for the appropriate form.
 
--------------------------------------------------------------------------------
WHAT OTHER SHAREHOLDER PROGRAMS ARE PROVIDED?
--------------------------------------------------------------------------------
 
ACH PROCESSING
 
The Fund offers ACH privileges. Investors may use ACH processing to make
subsequent purchases, redeem Shares and/or electronically transfer distributions
paid on Fund Shares, in addition to the other methods described in this
Prospectus. ACH provides a method by which funds may be automatically
transferred to or from an authorized bank account at a Federal Reserve member
bank that is an ACH member. Please contact your representative if you are
interested in ACH processing.
 
EXCHANGE PRIVILEGE
 
Shareholders of the Fund may, provided the amount to be exchanged meets the
applicable minimum investment requirements and the exchange is made in states
where it is legally authorized, exchange Shares of the Fund for shares of:
 
     Cardinal Balanced Fund,
     a fund seeking current income and
     long-term growth of both capital and income
     (upon the payment of the applicable sales charge);
 
     The Cardinal Fund Inc.,
     an equity fund seeking long-term growth
     of capital and income (upon the payment of
     the applicable sales charge);
 
     Cardinal Government Obligations Fund,
     a fund investing in securities issued
     or guaranteed by the U.S. Government
     (upon the payment of the appropriate
     sales charge);
 
                                       16
<PAGE>   19
 
     Cardinal Government Securities Trust,
     a U.S. Government securities money market fund
     (without payment of any sales charge); or
 
     Cardinal Tax Exempt Money Trust,
     a tax-free money market fund
     (without payment of any sales charge).
 
Notwithstanding the foregoing and subject to the limitations contained in the
following paragraph, (i) exchanges by holders of Fund Shares, for whom the sales
charge has been waived, for shares of a Cardinal Load Fund may be completed
without the payment of a sales charge, and (ii) exchanges of Fund Shares by all
other shareholders for shares of a Cardinal Load Fund may be completed upon the
payment of a sales charge equal to the difference, if any, between the sales
charge payable upon purchase of shares of such Cardinal Load Fund and the sales
charge previously paid on the Fund Shares to be exchanged.
 
The foregoing exchange privilege may be exercised only once in each calendar
quarter and must be made by written or telephonic authorization. A shareholder
should notify The Ohio Company of his desire to make an exchange, and The Ohio
Company will furnish, as necessary, a prospectus and an application form to open
the account. The Transfer Agent will require that any written authorization of
an exchange include a signature guarantee as described above under "HOW MAY I
REDEEM MY SHARES? -- Redemption by mail." However, a signature guarantee will
not be required if the exchange is requested to be made within the same account
or into an existing account of the shareholder held in the same name or names
and in the same capacity as the account from which the exchange is to be made.
Shareholders may also authorize an exchange of Shares of the Fund by telephone.
Neither the Group, the Fund nor any of its service providers will be liable for
any loss, damages, expense or cost arising out of any telephone exchange
authorization to the extent and subject to the requirements set forth under "HOW
MAY I REDEEM MY SHARES? -- Redemption by telephone" above.
 
For tax purposes, an exchange is treated as a redemption and a new purchase.
However, a shareholder may not include any sales charge on Shares of the Fund
for purposes of calculating the gain or loss realized upon an exchange of those
Shares within 90 days of their purchase.
 
The Group may, at any time, modify or terminate the foregoing exchange
privilege. The Group, however, will give shareholders of the Fund 60 days'
advance written notice of any such modification or termination.
 
--------------------------------------------------------------------------------
HOW IS NET ASSET VALUE CALCULATED?
--------------------------------------------------------------------------------
 
The net asset value of the Fund is determined once daily as of 4:00 P.M.
Columbus, Ohio time, on each Business Day. A "Business Day" is a day on which
the New York Stock Exchange is open for business and any other day (other than a
day on which no Shares of the Fund are tendered for redemption and no order to
purchase any Shares of the Fund is received) during which there is a sufficient
degree of trading in the Fund's portfolio securities that the net asset value
might be materially affected by changes in the value of the portfolio
securities. The net asset value per share of the Fund is computed by dividing
the sum of the value of the Fund's portfolio securities plus any cash and other
assets (including interest and dividends accrued but not received) minus all
liabilities (including estimated accrued expenses) by the total number of Shares
then outstanding.
 
The net asset value per share will fluctuate as the value of the investment
portfolio of the Fund changes. 

Portfolio securities which are traded on United States stock exchanges are 
valued at the last sale price on such an exchange as of the time of valuation 
on the day the securities are being valued. Securities traded in the 
over-the-counter market are valued at either the mean between the bid and 
ask prices or the last sale price as one or the other may be quoted by
the National Association of Securities Dealers Automated Quotation System
("NASDAQ") as of the time of valuation on the day the securities are being
valued. The Group uses one or more pricing services to provide such market
quotations. Securities and other assets for
 
                                       17
<PAGE>   20
 
which market quotations are not readily available are valued at fair value as
determined in good faith by or under the direction of the Board of Trustees of
the Group.
 
Determination of the net asset value may be suspended at times when (a) trading
on the New York Stock Exchange is restricted by applicable rules and regulations
of the Securities and Exchange Commission, (b) the New York Stock Exchange is
closed for other than customary weekend and holiday closings, (c) an emergency
exists as a result of which disposal by the Group of portfolio securities owned
by the Fund or valuation of net assets of the Fund is not reasonably
practicable, or (d) the Securities and Exchange Commission has by order
permitted such suspension.
 
--------------------------------------------------------------------------------
DOES THE FUND PAY FEDERAL INCOME TAX?
--------------------------------------------------------------------------------
 
Each of the funds of the Group, including the Fund, is treated as a separate
entity for federal income tax purposes and intends to qualify as a "regulated
investment company" under the Code for so long as such qualification is in the
best interest of that fund's shareholders. Qualification as a regulated
investment company under the Code requires, among other things, that the
regulated investment company distribute to its shareholders at least 90% of its
investment company taxable income. The Fund contemplates declaring as dividends
100% of the Fund's investment company taxable income (before deduction of
dividends paid).
 
A non-deductible 4% excise tax is imposed on regulated investment companies that
do not distribute in each calendar year (regardless of whether they otherwise
have a non-calendar taxable year) an amount equal to 98% of their ordinary
income for the calendar year plus 98% of their capital gain net income for the
one-year period ending on October 31 of such calendar year. The balance of such
income must be distributed during the next calendar year. If distributions
during a calendar year were less than the required amount, the Fund would be
subject to a nondeductible excise tax equal to 4% of the deficiency.
 
--------------------------------------------------------------------------------
WHAT ABOUT MY TAXES?
--------------------------------------------------------------------------------
 
It is expected that the Fund will distribute annually to shareholders all or
substantially all of the Fund's net ordinary income and net realized capital
gains and that such distributed net ordinary income and distributed net realized
capital gains will be taxable income to shareholders for federal income tax
purposes, even if paid in additional Shares of the Fund and not in cash. The
dividends-received deduction for corporations will apply to the aggregate of
such ordinary income distributions in the same proportion as the aggregate
dividends eligible for the dividends received deduction, if any, received by the
Fund bear to its gross income.
 
Distribution by the Fund of the excess of net long-term capital gain over net
short-term capital loss is taxable to shareholders as long-term capital gain in
the year in which it is received, regardless of how long the shareholder has
held the Shares. Such distributions are not eligible for the dividends-received
deduction.
 
If the net asset value of a Share is reduced below the shareholder's cost of
that Share by the distribution of income or gain realized on the sale of
securities, the distribution is a return of invested principal, although taxable
as described above.
 
Prior to purchasing Shares, the impact of dividends or capital gains
distributions which are expected to be declared or have been declared, but have
not been paid, should be carefully considered. Any such dividends or capital
gains distributions paid shortly after a purchase of Shares prior to the record
date will have the effect of reducing the per share net asset value of the
Shares by the amount of the dividends or distributions. All or a portion of such
dividends or distributions, although in effect a return of capital, is subject
to tax.
 
Foreign taxes may be imposed on the Fund by foreign countries with respect to
its income from foreign securities. Since less than 50% in value of the Fund's
total assets at the end of its fiscal year are expected to
 
                                       18
<PAGE>   21
 
be invested in stock or securities of foreign corporations, the Fund will not be
entitled under the Code to pass through to its Shareholders their pro rata share
of the foreign taxes paid by the Fund. These taxes will be taken as a deduction
by the Fund.
 
The foregoing is intended only as a brief summary of some of the important tax
considerations generally affecting the Fund and its shareholders. Potential
investors in the Fund are urged to consult their tax advisers concerning the
application of federal, state and local taxes as such laws and regulations
affect their own tax situation.
 
The Transfer Agent will inform shareholders at least annually of the amount and
nature of such income and capital gains.
 
--------------------------------------------------------------------------------
WHO MANAGES MY INVESTMENT IN THE FUND?
--------------------------------------------------------------------------------
 
Except where shareholder action is required by law, all of the authority of the
Group is exercised under the direction of the Group's Trustees, who are elected
by the shareholders of the Group's funds and who are empowered to elect officers
and contract with and provide for the compensation of agents, consultants and
other professionals to assist and advise in its day-to-day operations. The Group
will be managed in accordance with its Declaration of Trust and the laws of Ohio
governing business trusts.
 
The Trustees of the Group receive fees and are reimbursed for their expenses in
connection with each meeting of the Board of Trustees they attend. However, no
officer or employee of the Adviser or The Ohio Company receives any compensation
from the Group for acting as a Trustee of the Group. The officers of the Group
receive no compensation directly from the Group for performing the duties of
their offices. The Adviser receives fees from the Group for acting as investment
adviser and manager and as dividend and transfer agent. The Ohio Company
receives no fees under its Distribution Agreement with the Group but may retain
all or a portion of the sales charges and may receive fees under the
Distribution Plan discussed below.
 
INVESTMENT ADVISER
 
Cardinal Management Corp. (the "Adviser"), 155 East Broad Street, Columbus, Ohio
43215, a wholly owned subsidiary of The Ohio Company, is the investment adviser
and manager of the Fund. The Adviser is also the investment adviser and manager
of Cardinal Balanced Fund, another fund of the Group ("CBF"), and of Cardinal
Government Securities Trust ("CGST"), Cardinal Tax Exempt Money Trust ("CTEMT")
and Cardinal Government Obligations Fund ("CGOF"), each of which is a separate
diversified management investment company.
 
The Ohio Company, an investment banking firm organized in 1925, is a member of
the New York Stock Exchange, the Midwest Stock Exchange, other regional stock
exchanges and the National Association of Securities Dealers, Inc. Descendants
of H.P. and R.F. Wolfe, deceased, and members of their families, through their
possession of a majority of a voting stock, may be considered controlling
persons of The Ohio Company. In addition to acting as the principal underwriter
for the Fund, CBF, CGST, CTEMT and CGOF, The Ohio Company also serves as
investment adviser and principal underwriter for The Cardinal Fund Inc.
 
In its capacity as investment adviser, and subject to the ultimate authority of
the Group's Board of Trustees, the Adviser, in accordance with its investment
objectives and policies manages the Fund, makes decisions with respect to and
places orders for all purchases and sales of its portfolio securities. Since the
Fund's inception, Timothy C. McCombs has been primarily responsible for the
day-to-day management of the Fund's portfolio. Mr. McCombs has been a portfolio
manager and equity analyst with The Ohio Company since 1986. In addition,
pursuant to the Investment Advisory Agreement, the Adviser generally assists in
all aspects of the Fund's administration and operation.
 
For the services provided and expenses assumed pursuant to its investment
advisory agreement with the Group with respect to the Fund, the Adviser receives
a fee from the Fund, computed daily and paid
 
                                       19
<PAGE>   22
 
monthly at the annual rate of .75% of average net daily assets of the Fund.
While in the opinion of the staff of the Securities and Exchange Commission such
fee is higher than the advisory fee paid by most mutual funds, the Group's Board
of Trustees believes it to be comparable to advisory fees paid by many funds
having similar objectives and policies.
 
DIVIDEND AND TRANSFER AGENT AND FUND ACCOUNTANT
 
The Group has entered into a Transfer Agency and Fund Accounting Agreement with
Cardinal Management Corp. (the "Transfer Agent"), 215 East Capital Street,
Columbus, Ohio 43215, pursuant to which the Transfer Agent has agreed to act as
the Fund's transfer agent, dividend disbursing agent and administrator of plans
of the Fund. In consideration of such services, the Fund has agreed to pay the
Transfer Agent an annual fee, paid monthly, equal to $18 per shareholder account
plus out-of-pocket expenses. In addition, the Transfer Agent provides certain
fund accounting services for the Fund. The Transfer Agent receives a fee from
the Fund for such services equal to a fee computed daily and paid periodically
at an annual rate of .03% of the Fund's average daily net assets.
 
DISTRIBUTOR
 
The Group has entered into a Distributor's Contract with The Ohio Company, 155
East Broad Street, Columbus, Ohio 43215, pursuant to which Shares of the Fund
will be offered continuously on a best efforts basis by The Ohio Company and
dealers selected by The Ohio Company. Walter R. Chambers is an officer and
trustee of the Group and an officer and director of The Ohio Company. Frank W.
Siegel is an officer and trustee of the Group and an officer of The Ohio
Company. John L. Schlater is a trustee of the Group and an officer of The Ohio
Company. Barry C. McMahon, Timothy C. McCombs, David C. Will and James M.
Schrack II are officers of both the Group and The Ohio Company.
 
EXPENSES
 
The Adviser bears all expenses in connection with the performance of its
services as investment adviser, manager, transfer agent and fund accountant
other than the cost of securities (including brokerage commissions, if any)
purchased for the Fund.
 
DISTRIBUTION PLAN
 
Pursuant to Rule 12b-1 under the 1940 Act, the Group has adopted a Distribution
and Shareholder Service Plan (the "Plan"), under which the Fund is authorized to
pay or reimburse The Ohio Company, as the Fund's principal underwriter, a
periodic amount calculated at an annual rate not to exceed twenty-five one-
hundredths of one percent (.25%) of the average daily net asset value of the
Fund. Such amount may be used by The Ohio Company to pay broker-dealers
(including The Ohio Company), banks and other institutions (a "Participating
Organization") for distribution and/or shareholder service assistance pursuant
to an agreement between The Ohio Company and the Participating Organization or
for distribution assistance and/or shareholder service provided by The Ohio
Company pursuant to an agreement between The Ohio Company and the Group. Under
the Plan, a Participating Organization may include The Ohio Company, its
subsidiaries, and its affiliates.
 
As authorized by the Plan, The Ohio Company has entered into a Rule 12b-1
Agreement with the Group pursuant to which The Ohio Company has agreed to
provide certain shareholder services in connection with Shares of the Fund
purchased and held by The Ohio Company for the accounts of its customers and
Shares of the Fund purchased and held by customers of The Ohio Company directly,
including, but not limited to, answering Shareholder questions concerning the
Fund, providing information to Shareholders on their investments in the Fund and
providing such personnel and communication equipment as is necessary and
appropriate to accomplish such matters. In consideration of such services the
Group has agreed to pay The Ohio Company a monthly fee, computed at the annual
rate of .25% of the average aggregate net asset value of Shares held during the
period in customer accounts for which The Ohio Company has provided
 
                                       20
<PAGE>   23
 
services under this Agreement. Such fees paid by the Group will be borne solely
by the Fund. Such fee may exceed the actual costs incurred by The Ohio Company
in providing such services.
 
In addition, The Ohio Company may enter into, from time to time, other Rule
12b-1 Agreements with selected dealers pursuant to which such dealers will
provide certain Shareholder services such as those described above.
 
CUSTODIAN
 
The Group has appointed The Fifth Third Bank ("Fifth Third") 38 Fountain Square
Plaza, Cincinnati, Ohio 45263, as the Fund's custodian. In such capacity, Fifth
Third will hold or arrange for the holding of all portfolio securities and other
assets acquired and owned by the Fund.
 
--------------------------------------------------------------------------------
WHAT ARE MY RIGHTS AS A SHAREHOLDER?
--------------------------------------------------------------------------------
 
The Group was organized as an Ohio business trust on March 23, 1993. The Group
currently consists of two funds, each having its own class of shares. The other
fund of the Group is Cardinal Balanced Fund. Each share represents an equal
proportional interest in a fund with other shares of the same fund, and is
entitled to such dividends and distributions out of the income earned on the
assets belonging to that fund as are declared at the discretion of the Trustees.
 
Shareholders are entitled to one vote for each dollar of value invested and a
proportionate fractional vote for any fraction of a dollar invested, and will
vote in the aggregate and not by series except as otherwise expressly required
by law. For example, shareholders of the Fund will vote in the aggregate with
other shareholders of the Group with respect to the election of trustees and
ratification of the selection of independent accountants. However, shareholders
of the Fund will vote as a fund, and not in the aggregate with other
shareholders of the Group, for purposes of approval of amendments to the Fund's
investment advisory agreement, the Plan, or any of the Fund's fundamental
policies.
 
Overall responsibility for the management of the Fund is vested in the Board of
Trustees of the Group. See "WHO MANAGES MY INVESTMENT OF THE FUND?" Individual
Trustees are elected by the shareholders of the Group and may be removed by the
Board of Trustees or shareholders in accordance with the provisions of the
Declaration of Trust and By-Laws of the Group and Ohio law. See "ADDITIONAL
INFORMATION -- Miscellaneous" in the Statement of Additional Information for
further information.
 
An annual or special meeting of shareholders to conduct necessary business is
not required by the Declaration of Trust, the 1940 Act or other authority
except, under certain circumstances, to elect Trustees, amend the Declaration of
Trust, approve the investment advisory agreement and to satisfy certain other
requirements. To the extent that such a meeting is not required, the Group may
elect not to have an annual or special meeting.
 
The Group has represented to the Securities and Exchange Commission that the
Trustees will call a special meeting of shareholders for purposes of considering
the removal of one or more Trustees upon written request thereof from
shareholders holding not less than 10% of the outstanding votes of the Group and
that the Group will assist in communications with other shareholders as required
by Section 16(c) of the 1940 Act. At such meeting, a quorum of shareholders
(constituting a majority of votes attributable to all outstanding shares of the
Group), by majority vote, has the power to remove one or more Trustees.
 
As used in this Prospectus and in the Statement of Additional Information,
"assets belonging to a fund" means the consideration received by the fund upon
the issuance or sale of shares in that fund, together with all income, earnings,
profits, and proceeds derived from the investment thereof, including any
proceeds from the sale, exchange, or liquidation of such investments, and any
funds or amounts derived from any reinvestment of such proceeds, and any general
assets of the Group not readily identified as belonging to a particular fund
that are allocated to the fund by the Group's Board of Trustees. The Board of
Trustees may allocate such general assets in any manner it deems fair and
equitable. Determinations by the
 
                                       21
<PAGE>   24
 
Board of Trustees of the Group as to the timing of the allocation of general
liabilities and expenses and as to the timing and allocable portion of any
general assets with respect to the Fund are conclusive.
 
As used in this Prospectus and in the Statement of Additional Information, a
"vote of a majority of the outstanding shares" of the Fund means the affirmative
vote, at a meeting of Shareholders duly called, of the lesser of (a) 67% or more
of the votes of shareholders of the Fund present at a meeting at which the
holders of more than 50% of the votes attributable to shareholders of record of
the Fund are represented in person or by proxy, or (b) the holders of more than
50% of the outstanding votes of shareholders of the Fund.
 
Holders of Shares should direct all inquiries concerning such matters to the
Transfer Agent, 215 East Capital Street, Columbus, Ohio 43215.
 
Shareholders will receive unaudited semi-annual reports describing the
investment operations of the Fund and annual financial reports audited by
independent auditors.
 
                                       22
<PAGE>   25
 
                                             Investment Adviser and Manager
                                                  Cardinal Management Corp.
                                                  155 East Broad Street
                                                  Columbus, Ohio 43215
 
                                             Distributor
                                                  The Ohio Company
                                                  155 East Broad Street
                                                  Columbus, Ohio 43215
 
                                             Transfer Agent and Dividend Paying
                                             Agent
                                                  Cardinal Management Corp.
                                                  215 East Capital Street
                                                  Columbus, Ohio 43215
 
                                             Custodian
                                                  The Fifth Third Bank
                                                  38 Fountain Square Plaza
                                                  Cincinnati, Ohio 45263
 
                                             Legal Counsel
                                                  Baker & Hostetler
                                                  65 East State Street
                                                  Columbus, Ohio 43215
 
                                             Independent Auditors
                                                  KPMG Peat Marwick LLP
                                                  Two Nationwide Plaza
                                                  Columbus, Ohio 43215
<PAGE>   26
 
         
=====================================================
                 TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                             PAGE
                                            ------
<S>                                         <C>
KEY FEATURES................................     2
PROSPECTUS HIGHLIGHTS.......................     3
FEE TABLE...................................     5
FINANCIAL HIGHLIGHTS........................     6
PERFORMANCE INFORMATION.....................     7
WHAT IS THE FUND?...........................     7
WHAT ARE THE INVESTMENT OBJECTIVES
  AND POLICIES OF THE FUND?.................     7
HOW DO I PURCHASE SHARES
  OF THE FUND?..............................    12
MAY MY TAX SHELTERED RETIREMENT PLAN INVEST
  IN THE FUND?..............................    13
HOW MAY I QUALIFY FOR QUANTITY DISCOUNTS?...    13
WHAT DISTRIBUTIONS WILL I RECEIVE?..........    14
HOW MAY I REDEEM MY SHARES?.................    15
WHAT OTHER SHAREHOLDER PROGRAMS ARE
  PROVIDED?.................................    16
HOW IS NET ASSET VALUE CALCULATED?..........    17
DOES THE FUND PAY FEDERAL INCOME TAX?.......    18
WHAT ABOUT MY TAXES?........................    18
WHO MANAGES MY INVESTMENT IN THE FUND?......    19
WHAT ARE MY RIGHTS AS A
  SHAREHOLDER?..............................    21
</TABLE>
 
                            ------------------------
 
NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, IN CONNECTION WITH THE OFFER CONTAINED IN THIS PROSPECTUS AND, IF
GIVEN OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON
AS HAVING BEEN AUTHORIZED BY THE FUND, THE ADVISER, OR THE DISTRIBUTOR. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER BY THE FUND OR BY THE DISTRIBUTOR TO
SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE SECURITIES OFFERED HEREBY
IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL FOR THE FUND TO MAKE
SUCH AN OFFER IN SUCH JURISDICTION.

======================================================

======================================================
 
 
                             ----------------------
                                   PROSPECTUS
                             ----------------------
 
                                February 1, 1995
 
                                    [LOGO]
 
                                    CARDINAL
                                   AGGRESSIVE
                                     GROWTH

                                      FUND


                                     [LOGO]

=====================================================



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