ASSET MANAGEMENT FUND INC
497, 1999-03-02
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<PAGE>   1
[AMF ASSET MANAGEMENT FUND, INC.]



                                                        U.S. GOVERNMENT MORTGAGE
                                                        SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------

                                            INTERMEDIATE MORTGAGE
                                            SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------

                                 SHORT U.S. GOVERNMENT
                                 SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------

                          ADJUSTABLE RATE MORTGAGE
                          (ARM) PORTFOLIO
- --------------------------------------------------------------------------------

                   MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
                                                        PROSPECTUS MARCH 1, 1999
<PAGE>   2
 
                                                       Providing Investment
                                                       Opportunities Covering
                                                       The Complete Maturity
                                                       Range of Fixed Income
                                                       Securities
 
March 1, 1999
- --------------------------------------------------------------------------------
 
                                   Prospectus
 
- --------------------------------------------------------------------------------
 
                                    AMF LOGO
- --------------------------------------------------------------------------------
 
                          Asset Management Fund, Inc.
 
                             Money Market Portfolio
                   Short U.S. Government Securities Portfolio
                    Adjustable Rate Mortgage (ARM) Portfolio
                   Intermediate Mortgage Securities Portfolio
                 U.S. Government Mortgage Securities Portfolio
 
                These Funds:
 
                   -  are not federally insured
 
                   -  have no bank or government guarantees
 
                   -  are not endorsed by any bank or government
                      agency
 
                   -  may lose value
 
  The Securities and Exchange Commission has not approved or disapproved these
securities or passed on the adequacy of this prospectus. It is a federal offense
                             to suggest otherwise.
 
There is no assurance that the Money Market Portfolio will be able to maintain a
                   stable net asset value of $1.00 per share.
<PAGE>   3
 
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                     <C>
SUMMARY
- -------------------------------------------
  Money Market Portfolio
  Short U.S. Government Securities
     Portfolio                            1
 
SUMMARY
- -------------------------------------------
  Adjustable Rate Mortgage (ARM)
     Portfolio
  Intermediate Mortgage Securities
     Portfolio
  U.S. Government Mortgage Securities
     Portfolio                            6
 
INVESTMENT INFORMATION                   13
- -------------------------------------------
  Investment Objectives and Principal
     Investment Strategies               13
     Money Market Portfolio and Short
       U.S. Government Securities
       Portfolio                         13
     Adjustable Rate Mortgage (ARM)
       Portfolio, Intermediate
       Mortgage Securities Portfolio
       and U.S. Government Mortgage
       Securities Portfolio              15
  Description of Securities and
     Related Risks                       16
     Mortgage-Related Securities         16
     Collateralized Mortgage
       Obligations                       18
     When-Issued and Delayed Delivery
       Securities                        19
     Variable and Floating Rate
       Securities                        20
     Repurchase Agreements               20
     Year 2000                           20
  Investment Limitations                 21
 
FUND AND PORTFOLIO INFORMATION           22
- -------------------------------------------
  Investment Adviser                     22
     Advisory Fee Expenses               22
     Portfolio Managers                  22
  Distributor                            23
 
NET ASSET VALUE                          23
- -------------------------------------------
INVESTING IN THE FUND                    24
- -------------------------------------------
  Share Purchases                        24
  Minimum Investment Required            25
  What Shares Cost                       25
  Confirmations                          25
  Dividends                              25
  Capital Gains                          25
 
REDEEMING SHARES                         26
- -------------------------------------------
  Telephone Redemption                   26
  Written Requests                       27
     Signatures                          27
     Receiving Payment                   27
 
EXCHANGES                                27
- -------------------------------------------
STOCKHOLDER INFORMATION                  28
- -------------------------------------------
  Voting Rights                          28
  Tax Information                        28
 
FINANCIAL HIGHLIGHTS                     29
- -------------------------------------------
  Money Market Portfolio                 29
  Short U.S. Government Securities
     Portfolio                           30
  Adjustable Rate Mortgage (ARM)
     Portfolio                           31
  Intermediate Mortgage Securities
     Portfolio                           32
  U. S. Government Mortgage Securities
     Portfolio                           33
 
NEW ACCOUNT APPLICATION
- -------------------------------------------
</TABLE>
<PAGE>   4
 
MONEY MARKET PORTFOLIO
SHORT U.S. GOVERNMENT SECURITIES PORTFOLIO                               SUMMARY
- --------------------------------------------------------------------------------
INVESTMENT OBJECTIVE
 
       Both Portfolios seek to achieve as high a level of current income as is
       consistent with the preservation of capital, the maintenance of liquidity
       and the differing average maturity of investments held by each.
 
       In pursuing this objective, both Portfolios limit their investments to
       those permissible without limitation for federal savings associations,
       national banks and federal credit unions under applicable federal law.
 
MAIN INVESTMENT STRATEGIES
 
       The MONEY MARKET PORTFOLIO invests in high quality short-term money
       market instruments (including assets subject to repurchase agreements).
       The Portfolio is managed to keep its share price stable at $1.00.
 
       The SHORT U.S. GOVERNMENT SECURITIES PORTFOLIO invests in high-quality
       assets, primarily in securities issued or guaranteed by the U.S.
       Government, its agencies or instrumentalities. To help minimize
       fluctuations in principal, the Portfolio will maintain a dollar-weighted
       average maturity of less than three years. The Portfolio is not a money
       market fund.
 
MAIN RISKS OF INVESTING
 
       Since the Money Market Portfolio attempts to maintain a constant $1.00
       share price, the Portfolio should have little risk of principal loss.
       Still, all investments carry some degree of risk and despite the
       Portfolio's policies of purchasing primarily government securities and
       maintaining a short average portfolio maturity, the Portfolio could
       experience principal losses and may lose money in the rare event that
       portfolio holdings default or interest rates rise sharply in an unusually
       short period. Yields may vary with different interest rates. In addition,
       neither the Federal Deposit Insurance Corporation (FDIC) nor any other
       government agency insures or guarantees investments in the Portfolio.
 
       For the Short U.S. Government Securities Portfolio, the primary risk
       factor that may reduce the Portfolio's return is change in interest
       rates. Prices of bonds tend to move inversely with changes in interest
       rates. While a rise in rates may provide the opportunity to invest
       available cash for higher yields, the most immediate effect is usually a
       drop in bond prices and, therefore, the Portfolio's share price. A
       security backed by the U.S. Treasury or the full faith and credit of the
       United States is guaranteed only as to the timely payment of interest and
       principal when held to maturity, but not the market value of such
       security. Although the Portfolio should have little risk of principal
       loss, it does not seek to maintain a constant share price. Your principal
       value can fluctuate over time.
 
       Pages two and three provide an illustration of how each Portfolio's
       performance has varied over time. The bar charts depict the change in
       each Portfolios' performance from year-to-year during the period
       indicated. The tables for each Portfolio compare that Portfolio's average
       annual returns for the periods indicated to a broad-based securities
       market index. A Portfolio's past performance does not necessarily
       indicate how it will perform in the future.
 
                                        1
<PAGE>   5
 
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
 
Annual Returns for the Years Ended December 31
 
Money Market Portfolio Graph
 
<TABLE>
<CAPTION>
                                                                        MONEY MARKET PORTFOLIO
                                                                        ----------------------
<S>                                                           <C>
'1989'                                                                           9.42
'1990'                                                                           8.08
'1991'                                                                           5.62
'1992'                                                                           3.34
'1993'                                                                           2.78
'1994'                                                                           3.93
'1995'                                                                           5.69
'1996'                                                                           5.19
'1997'                                                                           5.32
'1998'                                                                           5.25
</TABLE>
 
- ---------------
 
* The year to date return for the three month period ended January 31, 1999 is
  1.21%.
 
During the period shown in the bar chart, the highest return for a quarter was
2.41% (quarter ended 6/30/89) and the lowest return for a quarter was 0.68%
(quarter ended 12/31/93). The Money Market Portfolio's 7-day yield ending on
December 31, 1998 was 4.60%. To obtain the Portfolio's current 7-day yield
information, please call us toll-free at 1-800-527-3713.
 
Average Annual Total Returns (years ended December 31, 1998)
 
<TABLE>
<CAPTION>
                                                            1 Year   5 Years   10 Years
                                                            ------   -------   --------
<S>                                                         <C>      <C>       <C>
Money Market Portfolio...................................    5.25%    5.07%      5.44%
</TABLE>
 
                                        2
<PAGE>   6
 
SHORT U.S. GOVERNMENT SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
Annual Returns for the Years Ended December 31
 
Short U.S. Government Securities Portfolio Graph
 
<TABLE>
<CAPTION>
                                                              SHORT U.S. GOVERNMENT SECURITIES PORTFOLIO
                                                              ------------------------------------------
<S>                                                           <C>
'1989'                                                                           10.72
'1990'                                                                            9.40
'1991'                                                                           11.76
'1992'                                                                            6.51
'1993'                                                                            5.78
'1994'                                                                            0.40
'1995'                                                                           11.35
'1996'                                                                            3.61
'1997'                                                                            6.25
'1998'                                                                            6.60
</TABLE>
 
- ---------------
 
* The year to date return for the three month period ended January 31, 1999 is
  0.72%.
 
During the period shown in the bar chart, the highest return for a quarter was
5.22% (quarter ended 6/30/89) and the lowest return for a quarter was -0.42%
(quarter ended 3/31/94).
 
Average Annual Total Returns (years ended December 31, 1998)
 
<TABLE>
<CAPTION>
                                                          1 Year    5 Years    10 Years
                                                          ------    -------    --------
<S>                                                       <C>       <C>        <C>
Short U.S. Government Securities Portfolio............     6.60%     5.58%       7.18%
The Lehman Short Government 1-3 Years Index*..........     6.97%     5.96%       7.35%
</TABLE>
 
- ---------------
 
* The Lehman Short Government 1-3 Years Index is an unmanaged index comprised of
  the full range of 1-3 year U.S. Government and agency securities.
 
                                        3
<PAGE>   7
 
FEES AND EXPENSES:
 
Shareholder fees.  Neither of the Portfolios impose shareholder fees. These are
the fees charged directly to an investor's account. Examples of shareholder fees
include sales loads, redemption fees or exchange fees.
 
Annual Portfolio operating expenses are paid out of a Portfolio's assets and
include fees for portfolio management, maintenance of shareholder accounts,
shareholder servicing, accounting and other services. You do not pay these fees
directly but, as the example shows, these costs are borne indirectly by
shareholders.
 
FEES AND EXPENSES OF THE PORTFOLIOS
 
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Portfolio.
 
<TABLE>
<CAPTION>
                                                Money Market    Short U.S. Government
                                                 Portfolio      Securities Portfolio
                                                ------------    ---------------------
<S>                                             <C>             <C>
SHAREHOLDER FEES
Maximum Sales Charge Imposed on Purchases...    None                 None
Maximum Sales Charge Imposed on Reinvested
  Dividends.................................    None                 None
Redemption Fees.............................    None                 None
Exchange Fees...............................    None                 None
Maximum Account Fee.........................    None                 None
</TABLE>
 
<TABLE>
<CAPTION>
                                                Money Market    Short U.S. Government
                                                 Portfolio            Portfolio
                                                ------------    ---------------------
<S>                                             <C>             <C>
ANNUAL PORTFOLIO OPERATING EXPENSES (AS A
  PERCENTAGE OF AVERAGE NET ASSETS)
Advisory Fee................................       0.15%*               0.25%
12b-1 Fees..................................       0.15%                0.15%
Other Expenses..............................       0.10%                0.10%
                                                   -----                -----
Total Fund Operating Expenses...............       0.40%                0.50%
                                                   =====                =====
</TABLE>
 
- ---------------
 
* This table and the example on page 5 have been prepared to illustrate annual
  Fund Operating Expenses assuming no fee waivers. The Adviser voluntarily
  waived all of its advisory fees during the 1998 fiscal year. Therefore,
  "Advisory Fee" and "Total Fund Operating Expenses" for the Money Market
  Portfolio were 0% and 0.25%, respectively, for 1998.
 
                                        4
<PAGE>   8
 
EXAMPLE
 
This example is intended to help you compare the cost of investing in a
Portfolio with the cost of investing in other mutual funds. The example assumes
that you invest $10,000 in either Portfolio for the time periods indicated and
then redeem all of your shares at the end of those periods. The example also
assumes that your investment has a 5% return each year and that a Portfolio's
operating expenses remain the same. Although your actual costs may be higher or
lower, based on these assumptions your costs would be:
 
<TABLE>
<CAPTION>
                                                  1 Year   3 Years   5 Years   10 Years
                                                  ------   -------   -------   --------
<S>                                               <C>      <C>       <C>       <C>
Money Market Portfolio.........................    $41      $128      $224       $505
Short U.S. Government Securities Portfolio.....    $51      $160      $280       $628
</TABLE>
 
                                        5
<PAGE>   9
 
Adjustable Rate Mortgage (ARM) Portfolio
Intermediate Mortgage Securities Portfolio
U.S. Government Mortgage Securities Portfolio                            SUMMARY
- --------------------------------------------------------------------------------
Investment Objective
 
       The Portfolios seek to achieve as high a level of current income as is
       consistent with the preservation of capital, the maintenance of liquidity
       and the differing average maturity of investments held by each.
Main Investment Strategies
 
       The ADJUSTABLE RATE MORTGAGE (ARM) PORTFOLIO seeks lower volatility of
       principal than would be provided by fixed rate securities by investing
       primarily in high quality adjustable rate mortgage securities. The
       Adviser expects that a portfolio of these types of securities will
       generally provide higher current yields than money market securities or
       alternative investments of comparable quality and market rate volatility.
 
       The INTERMEDIATE MORTGAGE SECURITIES PORTFOLIO invests primarily in
       intermediate-term mortgage-related securities guaranteed directly by the
       United States or issued or guaranteed by U.S. Government agencies or
       instrumentalities. The Portfolio seeks to invest in mortgage-related
       securities that will produce less price volatility than would normally be
       associated with the ownership of 30-year, fixed-rate mortgage-backed
       securities and intends to maintain a dollar-weighted expected average
       life of between 2 to 7 years.
 
       The U.S. GOVERNMENT MORTGAGE SECURITIES PORTFOLIO invests primarily in
       mortgage-related securities guaranteed directly by the United States or
       issued or guaranteed by U.S. Government agencies or instrumentalities.
       The Portfolio intends to maintain a dollar-weighted expected average life
       of between 4 to 12 years.
Main Risks of Investing
 
       Normally, the values of mortgage-related securities (and in particular,
       fixed-rate ones) vary inversely with changes in prevailing interest
       rates. However, the potential for appreciation in fixed-rate
       mortgage-related securities in the event of a decline in interest rates
       could be lessened by increased principal prepayments on those securities
       (prepayment risk). Conversely, during periods of rising interest rates,
       property owners may prepay their mortgages more slowly than expected,
       resulting in slower prepayments of mortgage-backed securities (extension
       risk) which reduces the value of the security and increases its duration.
       In addition, investments in private issue mortgage-related securities may
       expose a Portfolio to
 
                                        6
<PAGE>   10
 
       the risk that the credit rating of the securities will be downgraded or
       the issuers default.
 
       For fixed rate mortgage-related securities, the potential for volatility
       in price increases as the duration of the security increases. A security
       backed by the U.S. Treasury or the full faith and credit of the United
       States is guaranteed only as to the timely payment of interest and
       principal when held to maturity and not as to market value.
 
       While the Adjustable Rate Mortgage (ARM) Portfolio seeks to maintain a
       stable net asset value, its net asset value may be more volatile than a
       money market fund and it might not be able to maintain a stable value. In
       addition, interest rates payable under adjustable rate mortgage
       securities are typically locked in only for short specified periods of
       time. Consequently, an increase in interest rates may cause a decline in
       the price of a security until such time as the security's interest rate
       is adjusted upward and a decline in prevailing interest rates may cause a
       decline in the yield on investments in such securities at the next reset.
 
       The Portfolios are designed for long-term investors. The Portfolios'
       returns will vary. There is no assurance that any Portfolio will achieve
       its investment objective. Your principal value can fluctuate over time.
       Pages eight, nine and ten provide an illustration of how each Portfolio's
       performance has varied over time. The bar charts depict the change in
       each Portfolios' performance from year-to-year during the period
       indicated. The table for each Portfolio compares that Portfolio's average
       annual returns for the periods indicated to a broad-based securities
       market index. A Portfolio's past performance does not necessarily
       indicate how it will perform in the future.
 
                                        7
<PAGE>   11
 
ADJUSTABLE RATE MORTGAGE (ARM) PORTFOLIO
- --------------------------------------------------------------------------------
 
Annual Returns for the Years Ended December 31
 
Adjustable Rate Mortgage Bar Chart
 
<TABLE>
<CAPTION>
                                                                    ADJUSTABLE RATE MORTGAGE (ARM)
                                                                               PORTFOLIO
                                                                    ------------------------------
<S>                                                           <C>
1991**                                                                           1.95
'1992'                                                                           4.42
'1993'                                                                           4.70
'1994'                                                                           1.97
'1995'                                                                           9.13
'1996'                                                                           5.92
'1997'                                                                           6.51
'1998'                                                                           5.14
</TABLE>
 
- ---------------
 
 * The year to date return for the three month period ended January 31, 1999 is
   1.48%.
** From inception September 18, 1991.
 
During the period shown in the bar chart, the highest return for a quarter was
2.95% (quarter ended 3/31/95) and the lowest return for a quarter was 0.07%
(quarter ended 6/30/94).
 
Average Annual Total Returns (years ended December 31, 1998)
 
<TABLE>
<CAPTION>
                                                                                Since
                                                                              Inception
                                                         1 Year    5 Years    (9/18/91)
                                                         ------    -------    ---------
<S>                                                      <C>       <C>        <C>
Adjustable Rate Mortgage (ARM) Portfolio.............     5.14%     5.71%       5.44%
The Lehman Adjustable Rate Mortgage Index*...........     5.27%     6.11%       6.03%
</TABLE>
 
- ---------------
 
* The Lehman Adjustable Rate Mortgage Index is an unmanaged index of adjustable
  rate mortgage-related securities. Comparative returns from 9/18/91 through
  12/31/92 are from the Lehman Short 1-2 Year Index. The Lehman Adjustable Rate
  Mortgage Index, which is a more relevant index, did not exist during this
  period.
 
                                        8
<PAGE>   12
 
INTERMEDIATE MORTGAGE SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
Annual Returns for the Years Ended December 31
 
Intermediate Mortgage Securities Portfolio Bar Chart
 
<TABLE>
<CAPTION>
                                                                   INTERMEDIATE MORTGAGE SECURITIES
                                                                               PORTFOLIO
                                                                   --------------------------------
<S>                                                           <C>
'1989'                                                                           12.64
'1990'                                                                            6.16
'1991'                                                                           16.18
'1992'                                                                            7.87
'1993'                                                                            6.86
'1994'                                                                           -1.60
'1995'                                                                           13.90
'1996'                                                                            2.85
'1997'                                                                            8.37
'1998'                                                                            6.90
</TABLE>
 
- ---------------
 
* The year to date return for the three month period ended January 31, 1999 is
  1.46%.
 
During the period shown in the bar chart, the highest return for a quarter was
8.57% (quarter ended 6/30/89) and the lowest return for a quarter was -1.63%
(quarter ended 3/31/94).
 
Average Annual Total Returns (years ended December 31, 1998)
 
<TABLE>
<CAPTION>
                                                          1 Year    5 Years    10 Years
                                                          ------    -------    --------
<S>                                                       <C>       <C>        <C>
Intermediate Mortgage Securities Portfolio............     6.90%     5.96%       7.90%
The Lehman U.S. Mortgage Index*.......................     6.96%     7.23%       9.13%
</TABLE>
 
- ---------------
 
* The Lehman U.S. Mortgage Index is an unmanaged index of agency mortgage-backed
  securities.
 
                                        9
<PAGE>   13
 
U.S. GOVERNMENT MORTGAGE SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
Annual Returns for the Years Ended December 31
 
Mortgage Securities Bar Chart
 
<TABLE>
<CAPTION>
                                                                  U.S. GOVERNMENT MORTGAGE SECURITIES
                                                                               PORTFOLIO
                                                                  -----------------------------------
<S>                                                           <C>
'1989'                                                                           14.34
'1990'                                                                           10.05
'1991'                                                                           14.77
'1992'                                                                            6.44
'1993'                                                                            6.82
'1994'                                                                           -2.33
'1995'                                                                           16.15
'1996'                                                                            2.82
'1997'                                                                            9.67
'1998'                                                                            7.05
</TABLE>
 
* The year to date return for the three month period ended January 31, 1999 is
  1.34%.
 
During the period shown in the bar chart, the highest return for a quarter was
7.99% (quarter ended 6/30/89) and the lowest return for a quarter was -2.37%
(quarter ended 3/31/94).
 
Average Annual Total Returns (years ended December 31, 1998)
 
<TABLE>
<CAPTION>
                                                          1 Year    5 Years    10 Years
                                                          ------    -------    --------
<S>                                                       <C>       <C>        <C>
U.S. Government Mortgage Securities Portfolio.........     7.05%     6.47%       8.44%
The Lehman U.S. Mortgage Index*.......................     6.96%     7.23%       9.13%
</TABLE>
 
- ---------------
 
* The Lehman U.S. Mortgage Index is an unmanaged index of agency mortgage-backed
  securities.
 
                                       10
<PAGE>   14
 
FEES AND EXPENSES:
 
Shareholder fees. None of the Portfolios impose shareholder fees. These are the
fees charged directly to an investor's account. Examples of shareholder fees
include sales loads, redemption fees or exchange fees.
 
Annual Portfolio operating expenses are paid out of a Portfolio's assets and
include fees for portfolio management, maintenance of shareholder accounts,
shareholder servicing, accounting and other services. You do not pay these fees
directly but, as the example shows, these costs are borne indirectly by
shareholders.
 
FEES AND EXPENSES OF THE PORTFOLIOS
 
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Portfolio.
 
<TABLE>
<CAPTION>
                                      Adjustable Rate       Intermediate         U.S. Government
                                      Mortgage (ARM)          Mortgage               Mortgage
                                         Portfolio      Securities Portfolio   Securities Portfolio
                                      ---------------   --------------------   --------------------
<S>                                   <C>               <C>                    <C>
SHAREHOLDER FEES
Maximum Sales Charge Imposed on
  Purchases........................        None                 None                   None
Maximum Sales Charge Imposed on
  Reinvested Dividends.............        None                 None                   None
Redemption Fees....................        None                 None                   None
Exchange Fees......................        None                 None                   None
Maximum Account Fee................        None                 None                   None
</TABLE>
 
<TABLE>
<CAPTION>
                                      Adjustable Rate       Intermediate         U.S. Government
                                      Mortgage (ARM)          Mortgage               Mortgage
                                         Portfolio      Securities Portfolio   Securities Portfolio
                                      ---------------   --------------------   --------------------
<S>                                   <C>               <C>                    <C>
ANNUAL PORTFOLIO OPERATING EXPENSES
  (AS A PERCENTAGE OF AVERAGE NET
  ASSETS)
Advisory Fee.......................        0.45%(1)            0.35%(2)               0.25%
12b-1 Fees.........................        0.25%(1)            0.15%                  0.15%
Other Expenses.....................        0.09%               0.09%                  0.13%
                                           -----               -----                  -----
Total Fund Operating Expenses......        0.79%               0.59%                  0.53%
                                           =====               =====                  =====
</TABLE>
 
- ---------------
 
(1) The fee table and the example on page 12 have been prepared to illustrate
    annual Fund Operating Expenses assuming no fee waivers. The Adviser and the
    Distributor voluntarily waived a portion of the their fees during the 1998
    fiscal year. Therefore, the "Advisory Fee," "12b-1 Fees" and "Total Fund
    Operating Expenses" for the Adjustable Rate Mortgage (ARM) Portfolio were
    0.25%, 0.15% and 0.49%, respectively, for 1998.
 
(2) The fee table and the example on page 12 have been prepared to illustrate
    annual Fund Operating Expenses assuming no fee waivers. The Adviser
    voluntarily waived a portion of its advisory fee during the 1998 fiscal
    year. Therefore, the "Advisory Fee" and "Total Fund Operating Expenses" for
    the Intermediate Mortgage Securities Portfolio were 0.25% and 0.49%,
    respectively, for 1998.
 
                                       11
<PAGE>   15
 
EXAMPLE
 
This example is intended to help you compare the cost of investing in the
Adjustable Rate Mortgage (ARM) Portfolio, Intermediate Mortgage Securities
Portfolio or U.S. Government Mortgage Securities Portfolio with the cost of
investing in other mutual funds. The example assumes that you invest $10,000 in
a Portfolio for the time periods indicated and then redeem all of your shares at
the end of those periods. The example also assumes that your investment has a 5%
return each year and that a Portfolio's operating expenses remain the same.
Although your actual costs may be higher or lower, based on these assumptions
your costs would be:
 
<TABLE>
<CAPTION>
                                                     1 Year   3 Years   5 Years   10 Years
                                                     ------   -------   -------   --------
<S>                                                  <C>      <C>       <C>       <C>
Adjustable Rate Mortgage (ARM) Portfolio...........   $81      $252      $439       $978
Intermediate Mortgage Securities Portfolio.........   $60      $189      $329       $738
U.S. Government Mortgage Securities Portfolio......   $54      $170      $296       $665
</TABLE>
 
                                       12
<PAGE>   16
 
INVESTMENT INFORMATION
Investment Objectives and Principal Investment Strategies
- --------------------------------------------------------------------------------
 
       The investment objective of the Fund is to achieve as high a level of
       current income as is consistent with the preservation of capital, the
       maintenance of liquidity and the differing average maturity of
       investments held by each of the Fund's Portfolios. Each Portfolio pursues
       this investment objective by investing in the securities described below.
       While there is no assurance that a Portfolio will achieve its investment
       objective, each endeavors to do so by following the investment policies
       and limitations described below. The Fund's investment objective and
       these policies and limitations cannot be changed as to a Portfolio
       without approval of that Portfolio's stockholders.
 
Money Market Portfolio and
Short U.S. Government Securities Portfolio
 
       The Money Market Portfolio invests only in high quality assets (including
       assets subject to repurchase agreements) that qualify as "liquid assets"
       for savings associations under the regulations of the Office of Thrift
       Supervision of the Department of the Treasury ("OTS Regulations") and
       that, if included in the Portfolio, will qualify its shares as "liquid
       assets." As a result, the Fund believes Portfolio shares qualify as
       "liquid assets" under the OTS Regulations. The Portfolio invests in high
       quality short-term money market instruments that are determined to
       present minimal credit risks and that meet the quality and
       diversification requirements of Rule 2a-7 under the Investment Company
       Act of 1940. Securities must be rated in the top two rating categories by
       the required number of nationally recognized statistical rating
       organizations (at least two or, if only one such organization has rated
       the security, that one organization) or, if unrated, must be deemed by
       the Adviser to be comparable in quality. The diversification requirements
       provide generally that the Portfolio may not at the time of acquisition
       invest more than 5% of its assets in securities of any one issuer or
       invest more than 5% of its assets in securities that have not been rated
       in the highest category by the required number of rating organizations
       or, if unrated, have not been deemed comparable, except U.S. Government
       securities and repurchase agreements collateralized by such securities.
       The Portfolio will maintain a dollar-weighted average maturity of 90 days
       or less. It is the policy of the Portfolio that it generally holds its
       investments to maturity.
 
       The Short U.S. Government Securities Portfolio invests only in high
       quality assets (including assets subject to repurchase agreements) that
       qualify as "liquid assets" for savings associations under the current OTS
       Regulations and that, if included in the Portfolio, will qualify its
       shares as "liquid assets." As a result, the Fund believes Portfolio
       shares qualify as "liquid assets" under the OTS Regulations. As a
       fundamental investment policy, the Portfolio invests, under normal market
       conditions, at least 65% of its total assets in U.S. Government
       obligations, which consist of obligations issued directly by the United
       States and obligations issued by or fully guaranteed by
 
                                       13
<PAGE>   17
 
       U.S. Government agencies or instrumentalities. In addition, under normal
       market conditions, the Portfolio will maintain a dollar-weighted average
       maturity of less than three years as a non-fundamental investment policy.
 
       Permissible investments for the Money Market Portfolio and the Short U.S.
       Government Securities Portfolio include:
 
       - Obligations issued directly by the U.S. Government or issued by an
         agency or instrumentality of the U.S. Government and fully guaranteed
         as to principal and interest by the U.S. Government, although not as to
         market value. These obligations include U.S. Treasury bonds, notes and
         bills and obligations issued by the Federal Financing Bank and the
         Government National Mortgage Association. These obligations may also
         include variable and floating rate securities.
 
       - Obligations issued by or fully guaranteed as to principal and interest
         by the following U.S. Government agencies or instrumentalities: the
         Federal Home Loan Banks, Freddie Mac, Fannie Mae, the Federal Farm
         Credit Banks and the Student Loan Marketing Association. Since the
         obligations issued or guaranteed by these U.S. Government agencies or
         instrumentalities are not backed by the full faith and credit of the
         U.S. Government, the Portfolio must look principally to the agencies or
         instrumentalities for ultimate repayment, and may not be able to assert
         claims against the U.S. Government itself if those agencies or
         instrumentalities do not meet their commitments.
 
       - Certificates of deposit and other time deposits and savings accounts in
         a commercial or savings bank or savings association whose accounts are
         insured by the Federal Deposit Insurance Corporation ("FDIC Insured
         Institution"), including certificates of deposit issued by and other
         time deposits in foreign branches of FDIC insured banks, if they have
         remaining maturities of 397 days or less (if negotiable) or 90 days or
         less (if non-negotiable). Investments in certificates of deposit issued
         by and other time deposits in foreign branches of FDIC insured banks
         involve somewhat different investment risks from those affecting
         deposits in United States branches of such banks, including the risk of
         future political or economic developments, or government action, that
         would adversely affect payments on deposits.
 
       - Bankers' acceptances of an FDIC Insured Institution if such acceptances
         have remaining maturities of 6 months or less and the Portfolio's total
         investment in such acceptances of the same institution does not exceed
         0.25% of such institution's total deposits.
 
       Each Portfolio's investments in repurchase agreements and certificates of
       deposit and other time deposits of or in FDIC Insured Institutions will
       generally not be insured by any government agency. The Board of Directors
       has adopted operating policies to further restrict certain investments
       (see Statement of Additional Information for these two Portfolios).
 
                                       14
<PAGE>   18
 
Adjustable Rate Mortgage (ARM) Portfolio,
Intermediate Mortgage Securities Portfolio and
U.S. Government Mortgage Securities Portfolio
 
       The Adjustable Rate Mortgage (ARM) Portfolio, the Intermediate Mortgage
       Securities Portfolio, and the U.S. Government Mortgage Securities
       Portfolio (collectively referred to as the "Mortgage Securities
       Portfolios") invest primarily in "securities backed by or representing an
       interest in mortgages on domestic residential housing or manufactured
       housing" meeting the definition of such assets for purposes of the
       qualified thrift lender ("QTL") test under the current Office of Thrift
       Supervision ("OTS") Regulations. Pending any revisions of the current OTS
       Regulations, each Mortgage Securities Portfolio expects that, absent
       extraordinary market developments, at least 65% of its assets will
       qualify for QTL purposes for savings associations, although actual
       percentages may be higher. In addition, each Mortgage Securities
       Portfolio will not purchase any investments having a risk-based weighting
       in excess of 20% under the current risk-based capital regulations
       established by the OTS. Also, each Mortgage Securities Portfolio will not
       purchase any investments having a risk-based weighting for banks in
       excess of 50% under current federal regulations of the appropriate
       regulatory agencies. Furthermore, each Mortgage Securities Portfolio will
       not invest in "high risk" securities that do not meet the tests contained
       in the "Supervisory Policy Statement on Securities Activities" adopted by
       the Federal Deposit Insurance Corporation, the Office of the Comptroller
       of the Currency, the OTS and the National Credit Union Administration,
       respectively, and each Mortgage Securities Portfolio limits its
       investments to those permissible without limitation for federal savings
       associations, national banks and federal credit unions under current
       applicable regulations.
 
       The Adjustable Rate Mortgage (ARM) Portfolio will invest at least 65% of
       its assets in adjustable rate mortgage securities, except when the
       Portfolio assumes a temporary defensive position. This investment policy
       is deemed fundamental and may not be changed without stockholder
       approval. Because of the characteristics of adjustable rate mortgage
       securities, the Adviser expects that a portfolio of these types of
       securities will generally provide higher current yields than money market
       securities or alternative investments of comparable quality and market
       value volatility. While the Portfolio's net asset value will be more
       volatile than prices of money market securities, it will be less volatile
       than prices of fixed-rate securities of similar quality.
 
       The Intermediate Mortgage Securities Portfolio will invest at least 65%
       of its assets in mortgage-related securities paying fixed or adjustable
       rates of interest, except when the Portfolio assumes a temporary
       defensive position. This investment policy is deemed fundamental and may
       not be changed without stockholder approval. Generally, the Portfolio
       will seek to acquire mortgage-related securities having an expected
       average life of 2 to 7 years at the time of purchase and will also seek
       to maintain a dollar-weighted expected average life of between 2 to 7
       years with respect to such securities held by the Portfolio at any one
       time. These goals might be difficult to meet in certain environments when
       mortgage prepayments are very
 
                                       15
<PAGE>   19
 
       high or very low, but in no case would the Portfolio invest in a
       mortgage-related security that had an expected average life of greater
       than 10 years at the time of purchase.
 
       The U.S. Government Mortgage Securities Portfolio will invest at least
       65% of its assets in mortgage-related securities guaranteed directly by
       the United States or issued or guaranteed by U.S. Government agencies or
       instrumentalities ("Government Mortgage-Related Securities"), except when
       the Portfolio assumes a temporary defensive position. This investment
       policy is deemed fundamental and may not be changed without stockholder
       approval.
 
       In addition to mortgage-related securities, the Mortgage Securities
       Portfolios may invest in: (1) certain U.S. Government or agency
       securities, certain of which are not backed by the full faith and credit
       of the U.S. Government (see the Statement of Additional Information for
       the Mortgage Securities Portfolios), (2) investments in certificates of
       deposit or other time deposits or accounts of an FDIC Insured
       Institution, including foreign branches of FDIC insured banks, (3)
       repurchase agreements collateralized by securities in which the
       Portfolios may invest, or (4) bankers' acceptances of an FDIC insured
       bank if such acceptances have remaining maturities of six months or less
       and the Portfolio's total investments in such acceptances of the same
       bank do not exceed 0.25% of such bank's total deposits.
 
       The risk-based capital information and QTL qualifying percentages for
       each Mortgage Securities Portfolio will be communicated quarterly to the
       stockholders. The Board of Directors has adopted operating policies to
       further restrict certain investments (see the Statement of Additional
       Information for the Mortgage Securities Portfolios). When business or
       financial conditions warrant, the Portfolios may take a temporary
       defensive position and invest without limit in the foregoing investments.
Description of Securities and Related Risks
- --------------------------------------------------------------------------------
 
Mortgage-Related Securities
 
       "Mortgage-Related Securities" are high quality securities that directly
       or indirectly provide funds principally for residential mortgage loans
       made to home buyers in the United States and that represent interests in,
       or are collateralized by, pools of mortgage loans originated by private
       lenders that have been grouped by various governmental,
       government-related and private organizations. Most Mortgage-Related
       Securities are pass-through securities, which means that they provide
       investors with payments consisting of both principal and interest as
       mortgages in the underlying mortgage pool are paid off by the borrowers.
       The average maturity of pass-through Mortgage-Related Securities varies
       with the maturities of the underlying mortgage instruments and with the
       occurrence of unscheduled prepayments of those mortgage instruments. The
       text that follows is applicable to the Mortgage Securities Portfolios.
 
                                       16
<PAGE>   20
 
       Mortgage-Related Securities may be classified into the following
       principal categories, according to the issuer or guarantor:
 
       - Government Mortgage-Related Securities consist of both governmental and
         government-related securities. Governmental securities are backed by
         the full faith and credit of the U.S. Government. The Government
         National Mortgage Association ("GNMA"), the principal U.S. Government
         guarantor of such securities, is a wholly-owned U.S. Government
         corporation within the Department of Housing and Urban Development.
         GNMA is authorized to guarantee, with the full faith and credit of the
         U.S. Government, the timely payment of principal and interest, but not
         of market value, on securities issued by approved institutions and
         backed by pools of FHA-insured or VA-guaranteed mortgages. Government-
         related securities are issued by U.S. Government-sponsored corporations
         and are not backed by the full faith and credit of the U.S. Government.
         Issuers include Fannie Mae ("FNMA"), and Freddie Mac ("FHLMC"). FNMA is
         a U.S. Government-sponsored corporation owned entirely by private
         stockholders. Pass-through securities issued by FNMA are guaranteed as
         to timely payment of principal and interest by FNMA. FHLMC issues
         Mortgage-Related Securities representing interests in mortgage loans
         pooled by it. FHLMC is a U.S. Government-sponsored corporation that
         guarantees the timely payment of interest and ultimate collection of
         principal, and its stock is publicly traded.
 
       - Private Mortgage-Related Securities represent interests in, or are
         collateralized by, pools consisting principally of residential mortgage
         loans created by non-governmental issuers. These securities generally
         offer a higher rate of interest than governmental and
         government-related Mortgage-Related Securities because there are no
         direct or indirect government guarantees of payment as in the former
         securities, although certain credit enhancements may exist. Securities
         issued by private organizations may not have the same degree of
         liquidity as those with direct or indirect government guarantees.
         Private Mortgage-Related Securities purchased by the Mortgage
         Securities Portfolios must be rated in one of the two highest rating
         categories by at least one nationally recognized statistical rating
         organization.
 
       Mortgage-Related Securities include both fixed-rate and adjustable rate
       mortgage securities ("ARMS"). Unlike fixed-rate mortgage securities, ARMS
       have periodic adjustments in the coupons on the underlying mortgages. The
       adjustable rate feature of the mortgages underlying the ARMS in which the
       Mortgage Securities Portfolios invest generally will help to reduce sharp
       changes in each Portfolio's net asset value in response to normal
       interest rate fluctuations to the extent that each Portfolio is invested
       in ARMS. As the interest rates on the mortgages underlying a Portfolio's
       investments in ARMS are reset periodically (generally one to twelve
       months but as long as five years), the yields of such portfolio
       securities will gradually align themselves to reflect changes in market
       rates so that the market value of such securities will remain relatively
       constant as compared to fixed-rate instruments. This in turn should cause
       the net asset value of the Portfolio to fluctuate less than it would if
       the Portfolio invested entirely in more traditional longer-term, fixed-
       rate debt securities.
 
                                       17
<PAGE>   21
 
       In contrast to fixed-rate mortgages, which generally decline in value
       during periods of rising interest rates, ARMS permit a Portfolio to
       participate in increases in interest rates through periodic adjustments
       in the coupons of the underlying mortgages. This should produce both
       higher current yields and lower price fluctuations during such periods to
       the extent the Portfolio has invested in ARMS. Furthermore, if
       prepayments of principal are made on the underlying mortgages during
       periods of rising interest rates, the Portfolios generally will be able
       to reinvest such amounts in securities with a higher yield. For certain
       types of ARMS, the rate of amortization of principal, as well as interest
       payments, can and does change in accordance with movements in a
       particular, pre-specified, published interest rate index. The amount of
       interest due to an ARMS holder is calculated by adding a specified
       additional amount, the "margin," to the index, subject to limitations or
       "caps" on the maximum or minimum interest that is charged to the
       mortgagor during the life of the mortgage or to maximum and minimum
       changes in the interest rate during a given period. As a result, the
       Mortgage Securities Portfolios will not benefit from increases in
       interest rates to the extent that interest rates rise to the point where
       they cause the current coupon of adjustable rate mortgages held as
       investments to exceed the maximum allowable annual (usually 100 to 200
       basis points) or lifetime reset limits (or "cap rates") for a particular
       mortgage. Fluctuations in interest rates above these levels could cause
       such mortgage securities to behave more like long-term, fixed-rate debt
       securities. Moreover, a Portfolio's net asset value could vary to the
       extent that current yields on mortgage-backed securities are different
       than market yields during interim periods between coupon reset dates.
       Thus, investors could suffer some principal loss if they sold their
       shares of the Portfolio before the interest rates on the underlying
       mortgages were adjusted to reflect current market rates.
 
       All mortgage-backed securities carry the risk that interest rate declines
       may result in accelerated prepayment of mortgages and the proceeds from
       such prepayment of mortgages may be reinvested at lower prevailing
       interest rates. During periods of declining interest rates, the coupon
       rates for ARMS may readjust downward, resulting in lower yields to the
       Mortgage Securities Portfolios. Further, because of this feature, ARMS
       may have less potential for capital appreciation than fixed-rate
       instruments of comparable maturities during periods of declining interest
       rates. Therefore, ARMS may be less effective than fixed-rate securities
       as a means of "locking in" long-term interest rates.
 
       If mortgage securities are purchased at a premium, mortgage foreclosures
       and unscheduled principal prepayments may result in some loss of the
       holders' principal investment to the extent of the premium paid. On the
       other hand, if mortgage securities are purchased at a discount, both a
       scheduled payment of principal and an unscheduled repayment of principal
       will increase current and total returns.
 
Collateralized Mortgage Obligations
 
       Mortgage-Related Securities also include debt obligations collateralized
       by the cash flows from mortgage loans, pools of mortgage loans or
       mortgage pass-through securities (often referred to as collateralized
       mortgage obligations or
 
                                       18
<PAGE>   22
 
       "CMOs"). CMOs may be issued or guaranteed by GNMA, FNMA or FHLMC, or they
       may be issued by private entities such as financial institutions,
       investment bankers, mortgage bankers and single-purpose stand-alone
       finance subsidiaries or trusts of such institutions. The CMOs and a form
       of them known as a real estate mortgage investment conduit ("REMIC")
       typically have a multi-class structure ("Multi-Class Mortgage-Related
       Securities"). Multi-Class Mortgage-Related Securities issued by private
       issuers may be collateralized by pass-through securities guaranteed by
       GNMA or issued by FNMA or FHLMC, or they may be collateralized by whole
       loans or pass-through mortgage-related securities of private issuers.
       Each class has a specified maturity or final distribution date. In one
       structure, payments of principal, including any principal prepayments, on
       the collateral are applied to the classes in the order of their
       respective stated maturities or final distribution dates, so that no
       payment of principal will be made on any class until all classes having
       an earlier stated maturity or final distribution date have been paid in
       full. In other structures, certain classes may pay concurrently, or one
       or more classes may have a priority with respect to payments on the
       underlying collateral up to a specified amount. The Mortgage Securities
       Portfolios will not invest in any class with residual characteristics. In
       addition, each Portfolio limits its purchase of CMOs and REMICs issued by
       private entities to those that are rated in one of the two highest rating
       categories by at least one nationally recognized statistical ratings
       organization, and all CMOs and REMICs must pass the "high risk" tests
       applicable to the investments of federal savings associations, national
       banks and federal credit unions.
 
When-Issued and Delayed Delivery Securities
 
       The Mortgage Securities Portfolios may purchase securities on a
       when-issued or delayed delivery basis, i.e., for delivery and payment at
       a future date. The purchase price and the interest rate payable on the
       securities are fixed on the transaction date. At the time of its
       delivery, a when-issued or delayed delivery security may be valued at
       less than the purchase price. Each Portfolio will make commitments for
       such transactions only when it has the intention of actually acquiring
       the securities. If a Portfolio chooses to dispose of the right to acquire
       a when-issued or delayed delivery security prior to its acquisition, it
       could, as with the disposition of any other portfolio investment, incur a
       gain or loss due to market fluctuation. When securities are purchased on
       a when-issued or delayed delivery basis, the Portfolio must set aside
       funds in a segregated account to pay for the purchase, and until
       acquisition, the Portfolio will not earn any interest on the security.
       Each Portfolio may not enter into when-issued commitments exceeding in
       the aggregate 15% of the value of the Portfolio's total assets, less
       liabilities other than the obligations created by when-issued
       commitments.
 
                                       19
<PAGE>   23
 
Variable and Floating Rate Securities
 
       The Portfolios may purchase U.S. Government securities that have variable
       or floating rates of interest ("Variable Rate Securities"). These
       securities pay interest at rates that are adjusted periodically according
       to a specified formula, usually with reference to some interest rate
       index or market interest rate. The interest paid on Variable Rate
       Securities is a function primarily of the index or market rate upon which
       the interest rate adjustments are based. Similar to fixed rate debt
       instruments, variable and floating rate instruments are subject to
       changes in value based on changes in market interest rates, but because
       of the interest reset provision, the potential for capital appreciation
       or depreciation is generally less than for fixed rate obligations. Each
       Portfolio determines the maturity of Variable Rate Securities in
       accordance with Securities and Exchange Commission rules which allow the
       Portfolio to consider certain of such instruments as having maturities
       shorter than the maturity date on the face of the instrument.
Repurchase Agreements
 
       The Portfolios may enter into repurchase agreements under which each may
       acquire securities in which the particular Portfolio may invest for a
       relatively short period (usually not more than 30 days) subject to an
       obligation of the seller to repurchase and the Portfolio to resell the
       instrument at a fixed price and time, thereby determining the yield
       during the Portfolio's holding period. If the seller defaults in its
       obligation to repurchase from the Portfolio the underlying collateral,
       the Portfolio may incur a loss. Each Portfolio will make payment for such
       instruments only upon their physical delivery to or evidence of their
       book entry transfer to the account of the Portfolio's custodian. No
       Portfolio will enter into any repurchase agreements maturing in more than
       60 days.
Year 2000
 
       Like other mutual funds and business organizations worldwide, the Fund's
       service providers (among them, the Adviser, Distributor, administrator,
       custodian and transfer agent) must ensure that their computer systems are
       adjusted to properly process and calculate date-related information from
       and after January 1, 2000. Many software programs and, to a lesser
       extent, the computer hardware in use today cannot distinguish the year
       2000 from the year 1900. Such a design flaw could have a negative impact
       in the handling of securities trades, pricing and accounting services.
       The Fund and its service providers are actively working on necessary
       changes to computer systems to deal with the year 2000 issue and believe
       that their systems will be year 2000 compliant when required, but there
       can be no assurance that they will be successful. In addition there can
       be no assurance that the year 2000 issue will not have an adverse effect
       on the issuers whose securities are held by a Portfolio or on markets or
       on the economy in general.
 
                                       20
<PAGE>   24
 
Investment Limitations
- --------------------------------------------------------------------------------
 
       Each Portfolio may not borrow except that it may borrow from banks for
       temporary or emergency purposes in an aggregate amount not exceeding 10%
       of the value of its net assets and may pledge up to 20% of its net assets
       to secure such borrowings. All borrowings of the Intermediate Mortgage
       Securities Portfolio may not exceed in the aggregate one-third of the
       value of that Portfolio's total assets, less liabilities other than such
       borrowings. To the extent that borrowings exceed 5% of a Portfolio's net
       assets, such borrowings will be repaid before any investments are made.
 
       The Money Market Portfolio and the Short U.S. Government Securities
       Portfolio will not purchase any securities maturing in more than seven
       days for which market quotations are not readily available and will not
       enter into any repurchase agreements maturing in more than seven days if,
       as a result, more than 10% of the market value of their respective total
       assets would be invested in such illiquid securities together with such
       repurchase agreements maturing in more than seven days.
 
       The Money Market Portfolio and the Short U.S. Government Securities
       Portfolio will not invest more than 25% of their respective total assets
       in the securities of issuers in any single industry, provided that there
       shall be no such limitation on the purchase of obligations issued or
       guaranteed by the U.S. Government or its agencies or instrumentalities,
       or time deposits (including certificates of deposit), savings deposits
       and bankers' acceptances of United States branches of United States
       banks.
 
       The Adjustable Rate Mortgage (ARM) Portfolio will not purchase any
       securities maturing in more than seven days for which market quotations
       are not readily available, or purchase interest rate caps and floors, or
       enter into any repurchase agreements maturing in more than seven days if,
       as a result, more than 10% of the market value of its total assets would
       be invested in such illiquid securities.
 
       The Intermediate Mortgage Securities Portfolio will not purchase any
       securities maturing in more than seven days for which market quotations
       are not readily available and will not enter into any repurchase
       agreements maturing in more than seven days if, as a result, more than
       15% of the market value of its total assets would be invested in such
       illiquid securities together with repurchase agreements maturing in more
       than seven days. To the extent Rule 144A securities are deemed by the
       Adviser, subject to the supervision of the Board of Directors, to be
       illiquid, they will be subject to the foregoing 15% limitation on
       illiquid securities.
 
       The U.S. Government Mortgage Securities Portfolio will not purchase any
       Mortgage-Related Securities or other securities maturing in more than
       seven days for which market quotations are not readily available and will
       not enter into any repurchase agreements maturing in more than seven days
       if, as a result, more than 10% of the market value of its total assets
       would be invested in such illiquid securities together with such
       repurchase agreements maturing in more than seven days.
 
                                       21
<PAGE>   25
 
       The Mortgage Securities Portfolios will not invest more than 25% of their
       respective total assets in the securities of issuers in any single
       industry, provided that there shall be no limitation on investments in
       the mortgage and mortgage finance industry (in which more than 25% of the
       value of each Portfolio's total assets will, except for temporary
       defensive purposes, be invested) or on obligations issued or guaranteed
       by the U.S. Government or its agencies or instrumentalities.

FUND AND PORTFOLIO INFORMATION

INVESTMENT ADVISER
- --------------------------------------------------------------------------------
 
       Investment decisions for the Portfolios are made by Shay Assets
       Management, Inc. ("Adviser"), a company controlled by Rodger D. Shay. The
       Adviser, which is located at 230 West Monroe Street, Chicago, Illinois
       60606, is registered under the Investment Advisers Act of 1940 and
       manages approximately $1.5 billion in assets. Prior to December 8, 1997,
       Shay Assets Management Co. ("SAMC"), a company half of which was
       controlled by Rodger D. Shay and half owned by an indirect wholly owned
       subsidiary of America's Community Bankers, served as the Fund's
       investment adviser. The Adviser is responsible for placing purchase and
       sale orders for portfolio instruments.
 
Advisory Fee Expenses
 
       The Portfolios pay an annual advisory fee based upon a percentage of
       average daily net assets. During the period from November 1, 1997 through
       December 7, 1997, the advisory fee was paid to SAMC and from December 8,
       1997 through October 31, 1998, the advisory fee was paid to the Adviser
       as follows:
 
<TABLE>
<S>                                                   <C>
Money Market Portfolio..............................    0.00%*
Short U.S. Government Securities Portfolio..........    0.25%
Adjustable Rate Mortgage (ARM) Portfolio............    0.25%*
Intermediate Mortgage Securities Portfolio..........    0.25%*
U.S. Government Mortgage Securities Portfolio.......    0.25%
</TABLE>
 
- ---------------
 
* The investment advisers voluntarily waived all advisory fees with respect to
  the Money Market Portfolio. Without such waivers, the fee would have been
  0.15%. The investment advisers voluntarily waived a portion of the advisory
  fees with respect to the Adjustable Rate Mortgage (ARM) Portfolio and the
  Intermediate Mortgage Securities Portfolio. Without such waivers, the fees
  would have been 0.45% and 0.35%, respectively.
 
       Each voluntary waiver may be terminated at any time by the Adviser.
 
Portfolio Managers
 
       The Portfolio Managers of the Adviser manage the Fund's investments as a
       team under the day-to-day direction of Edward E. Sammons, Jr., President
       of the Adviser. Mr. Sammons has served as President of the Fund since
       1998 and was Vice President of the Fund from 1985 through 1997. Mr.
       Sammons assumed primary responsibility for the Fund's investments in
       1985.
 
                                       22
<PAGE>   26
 
Distributor
- --------------------------------------------------------------------------------
 
       Effective December 8, 1997, the Distributor, Shay Financial Services,
       Inc., succeeded to the broker-dealer business of Shay Financial Services
       Co. ("SFSC"). Pursuant to the Distribution Agreement, the Distributor, as
       the principal distributor of the Fund's shares, directly and through
       other firms advertises and promotes the Fund. For its distribution
       services, the Distributor receives an annual fee from the Fund in
       accordance with the distribution plan adopted by the Fund pursuant to
       Rule 12b-1 under the Investment Company Act of 1940 (the "12b-1 Plan").
       Because these fees are paid out of a Portfolio's assets on an on-going
       basis over time, these fees will increase the cost of your investment.
       This charge theoretically could cost you more over time than you would
       pay through some other types of sales charges; however, the Fund's Rule
       12b-1 fees are so low that the Fund is classified as a "no-load" fund.
NET ASSET VALUE
 
       For all Portfolios other than the Money Market Portfolio, the net asset
       value per share fluctuates daily. It is determined by dividing the value
       of all securities and all other assets, less liabilities, by the number
       of shares outstanding. Portfolio assets are valued at market value using
       market quotations or prices obtained from an independent pricing service
       based upon prices provided by market makers or estimates of market values
       obtained from yield data relating to instruments or securities with
       similar characteristics. For certain mortgage related securities the
       Board of Directors has approved the use of a matrix developed by the
       Adviser which the Board believes reflects the fair value of such
       securities. Short-term instruments maturing within 60 days may be valued
       at amortized cost, provided that the Board of Directors determines that
       amortized cost represents fair value.
 
       The Money Market Portfolio's net asset value per share is determined by
       dividing the value of all securities and all other assets, less
       liabilities, by the number of shares outstanding. The Portfolio's
       investments are valued in accordance with Rule 2a-7 under the Investment
       Company Act of 1940 based on their amortized cost, which does not take
       into account unrealized appreciation or depreciation. The Fund's Board of
       Directors has established procedures reasonably designed to stabilize the
       net asset value per share at $1.00, although there is no assurance that
       the Portfolio will be able to do so.
 
                                       23
<PAGE>   27
 
INVESTING IN THE FUND
Share Purchases
- --------------------------------------------------------------------------------
 
       To purchase shares of the Portfolios, investors may open an account by
       calling the Distributor at (800) 527-3713 and obtaining an application
       form. After a completed application form has been received and processed,
       orders to purchase shares of the Portfolios may be made by telephoning
       the Distributor.
 
       Purchase orders are accepted on each Business Day and become effective
       upon receipt and acceptance by the Fund. (As used in this Prospectus, the
       term "Business Day" means any day on which the Adviser and PFPC Trust
       Company are both open for business.) Payment must be in the form of
       federal funds. Wire transfer instructions for federal funds should be as
       follows: PFPC Trust Company, Philadelphia, PA, ABA 031 000 053; BNF
       Mutual Funds Services / 8529992181; For purchase of Asset Management
       Fund, (Name of Portfolio); From: (Name of Investor); Account Number
       (Investor's account number with the Fund); $(Amount to be invested).
 
       For an investor's purchase to be eligible for same day settlement, the
       purchase order must be received on a Business Day before 12:00 Noon, New
       York City time (or 1:00 P.M., New York City time, for Pacific time zone
       investors as determined by their addresses in the Fund's records), and
       payment for the purchase order must be received by PFPC Trust Company by
       4:00 P.M., New York City time, of that day. For investors seeking next
       day settlement, the purchase order must be received on a Business Day
       before 4:00 P.M., New York City time, and payment must be received by
       PFPC Trust Company by 4:00 P.M., New York City time, on the next Business
       Day after the purchase order was received. An investor must indicate to
       the Fund at the time the order is placed whether same day or next day
       settlement is sought. Payment must be received by PFPC Trust Company by
       4:00 P.M., New York City time, on the Business Day designated for
       settlement or the order will be cancelled.
 
       A purchase order is considered binding upon the investor. Should it be
       necessary to cancel an order because payment was not timely received, the
       Fund will hold the investor responsible for the difference between the
       price of the shares when ordered and the price of the shares when the
       order was cancelled. If the investor is already a shareholder of the
       Fund, the Fund may redeem shares from the investor's account in an amount
       equal to such difference. In addition, the Fund may prohibit or restrict
       the investor from making future purchases of the Fund's shares.
 
       Any federal funds received in respect of a cancelled order will be
       returned upon instructions from the sender without any liability of the
       Fund, the Adviser or PFPC Trust Company. If it is not possible to return
       such federal funds the same day, the sender will not have the use of such
       funds until the next day on which it is possible to effect such return.
       The Fund reserves the right to reject any purchase order.
 
                                       24
<PAGE>   28
 
Minimum Investment Required
- --------------------------------------------------------------------------------
 
       The minimum initial investment in each Portfolio is $10,000. There is no
       minimum balance. Subsequent purchases may be made in any amount.
What Shares Cost
- --------------------------------------------------------------------------------
 
       Shares of the Portfolios are sold at their net asset value next
       determined after the purchase order becomes effective. The Money Market
       Portfolio seeks to maintain a net asset value of $1.00 per share. (See
       "Net Asset Value.") There is no sales charge imposed by the Portfolios.
       For all Portfolios other than the Money Market Portfolio, the net asset
       value is determined each Business Day at 4:00 P.M., New York City time.
       For the Money Market Portfolio, net asset value is determined twice on
       each Business Day, at 1:00 P.M. and at 4:00 P.M., New York City time. Net
       asset value for purposes of pricing redemption orders is determined at
       4:00 P.M., New York City time, on any day redemptions are permitted and a
       proper redemption request is received (see "Redeeming Shares").
Confirmations
- --------------------------------------------------------------------------------
 
       As transfer and dividend agent for the Fund, PFPC maintains a share
       account for each stockholder. Detailed confirmations of each purchase or
       redemption are sent to each stockholder. Monthly confirmations are sent
       to report dividends paid during the month.
Dividends
- --------------------------------------------------------------------------------
 
       Dividends are declared daily and paid monthly. Such dividends are
       declared immediately prior to 4:00 P.M., New York City time, and are
       automatically reinvested in additional shares of the respective
       Portfolios unless the stockholder requests cash payments by contacting
       the Distributor.
 
       For all Portfolios other than the Money Market Portfolio, an investor
       will receive the dividend declared on both the day its purchase order is
       settled and the day its redemption order is effected, including any next
       succeeding non-Business Day or Days, since proceeds are normally wired
       the next Business Day. For the Money Market Portfolio, an investor will
       receive the dividend declared on the day its purchase order is settled
       but will not receive the dividend declared on the day its redemption
       order is effected.
Capital Gains
- --------------------------------------------------------------------------------
 
       Net capital gains, if any, realized by a Portfolio are declared and paid
       once each year and reinvested in shares or, at the stockholder's option,
       paid in cash.
 
                                       25
<PAGE>   29
 
REDEEMING SHARES
 
       The Portfolios redeem shares at their respective net asset values next
       determined after the Distributor receives the redemption request.
       Redemptions may be made on Business Days when the U.S. Government and
       agency securities market is open. Redemption requests must be received in
       proper form and can be made by telephone or in writing.
Telephone Redemption
- --------------------------------------------------------------------------------
 
       - For all Portfolios other than the Money Market Portfolio:
 
         Stockholders may redeem their shares by telephoning the Distributor on
         a Business Day. Call (800) 527-3713. The time the redemption request is
         received determines when proceeds are sent and the accrual of
         dividends. Redemptions received prior to 12:00 Noon, New York City time
         (1:00 P.M., New York City time, for investors in the Pacific time
         zone), on a Business Day or other day redemptions are permitted, are
         effected on the same day, immediately after 4:00 P.M., New York City
         time. This means that proceeds will normally be wired in federal funds
         to the stockholder's bank or other account shown on the Fund's records
         the next Business Day, but in no case later than seven days. A
         stockholder will receive dividends declared only through the day its
         redemption is effected and any next succeeding non-Business Day or
         Days. All redemptions received between 12:00 Noon and 4:00 P.M., New
         York City time, on a Business Day or other day redemptions are
         permitted, are effected on the same day, immediately after 4:00 P.M.,
         New York City time; however, the proceeds will normally be sent the
         second following Business Day. The stockholder will receive dividends
         declared only through the day its redemption is effected, including any
         next succeeding non-Business Day or Days, but will not be entitled to
         dividends for the following Business Day. The Fund recommends that all
         redemption requests be placed so as to be received prior to 12:00 Noon,
         New York City time, because of the advantage in having proceeds sent
         the next Business Day.
 
       - For the Money Market Portfolio:
 
         Stockholders may redeem their shares by telephoning the Distributor on
         a Business Day. Call (800) 527-3713. If the request is received before
         12:00 Noon, New York City time (1:00 P.M., New York City time, for
         investors in the Pacific time zone), on a Business Day, the redemption
         will be effected as of 1:00 P.M., New York City time, and the proceeds
         will normally be wired the same day in federal funds to the
         stockholder's bank or other account shown on the Fund's records, but in
         no case later than seven days. If the request is received before 4:00
         P.M., New York City time, on a Business Day or other day redemptions
         are permitted, the redemption will be effected as of 4:00 P.M., New
         York City time, and the proceeds will normally be wired the next
         Business Day.
 
                                       26
<PAGE>   30
 
Since a stockholder will not receive any dividend declared on the day its
redemption request is effected, the Fund recommends that all redemption requests
be placed so as to be received prior to 12:00 Noon, New York City time.

WRITTEN REQUESTS
- --------------------------------------------------------------------------------
 
       Portfolio shares may also be redeemed by sending a written request to the
       Distributor, 230 W. Monroe Street, Chicago, Illinois 60606; Attention:
       Asset Management Fund, Inc. If share certificates have been issued, they
       must be properly endorsed and guaranteed and be received by PFPC before
       the redemption will be effected.
 
Signatures
 
       Signatures on written redemption requests and share certificates must be
       guaranteed by:
 
        - a Federal Home Loan Bank; or
 
        - a savings association or a savings bank; or
 
        - a trust company or a commercial bank; or
 
        - a member firm of a domestic securities exchange or a registered
          securities association; or
 
        - a credit union or other eligible guarantor institution.
 
       In certain instances, the transfer and dividend agent may request
       additional documentation believed necessary to insure proper
       authorization. Stockholders with questions concerning documentation
       should call the Distributor at (800) 527-3713.
 
Receiving Payment
 
       Proceeds of written redemption requests are sent at the same time and in
       the same manner as for telephone redemptions, based on the time of the
       receipt in proper form.

EXCHANGES
 
       Stockholders may exchange shares of a Portfolio with shares in another
       Portfolio of the Fund by telephoning the Distributor on a Business Day.
       Call (800) 527-3713. Exchanges may also be made by written request as
       previously described under "Written Requests." Exchanges will be effected
       at the relative net asset values next determined after receipt of an
       exchange request in proper form. Stockholders will receive dividends in
       the Portfolio through the date the exchange is effected and will begin
       receiving dividends in the other Portfolio the next Business Day.
 
                                       27
<PAGE>   31
 
       An exchange between Portfolios will normally involve realization of a
       capital gain or loss, since for federal income tax purposes an exchange
       is treated as a sale of the shares from which the exchange is made and a
       purchase of the shares into which the exchange is made.
 
       The Fund reserves the right to amend or terminate this privilege with
       notice to stockholders.
STOCKHOLDER INFORMATION
Voting Rights
- --------------------------------------------------------------------------------
 
       The Fund has five Portfolios: the Money Market Portfolio, the Short U.S.
       Government Securities Portfolio, the Adjustable Rate Mortgage (ARM)
       Portfolio, the Intermediate Mortgage Securities Portfolio and the U.S.
       Government Mortgage Securities Portfolio, and five classes of shares,
       representing interests only in the corresponding Portfolio and having
       equal voting rights within each class. The Fund's charter provides that
       on any matter submitted to a vote of stockholders, all shares,
       irrespective of class, shall be voted in the aggregate and not by class,
       except that (i) as to any matter with respect to which a separate vote of
       any class is required by the Investment Company Act of 1940 or the
       Maryland General Corporation Law, such requirements as to a separate vote
       by that class shall apply in lieu of the aggregate voting as described
       above, and (ii) as to any matter which does not affect the interest of a
       particular class, only stockholders of the affected class shall be
       entitled to vote thereon. The Bylaws of the Fund require that a special
       meeting of stockholders be held upon the written request of stockholders
       holding not less than 10% of the issued and outstanding shares of the
       Fund.
Tax Information
- --------------------------------------------------------------------------------
 
       Each of the Portfolios has not been required to pay federal income taxes
       because it has taken all necessary action to qualify as a regulated
       investment company under the Internal Revenue Code. Each Portfolio
       intends to remain so qualified for its future taxable years so long as
       such qualification is in the best interests of stockholders.
 
       The Fund intends to distribute all of the net income and any gains of the
       Portfolios to stockholders. Unless otherwise exempt, stockholders are
       required to pay federal income tax on any dividends and other
       distributions received. This applies whether dividends are received in
       cash or as additional shares. Dividends declared in December to
       stockholders of record as of a date in that month and paid during the
       following January are treated as if received on December 31 of the
       calendar year declared.
 
       Information on the tax status of dividends and distributions is provided
       annually.
 
                                       28
<PAGE>   32
 
FINANCIAL HIGHLIGHTS
 
       The financial highlights tables are intended to help you understand the
       Fund's financial performance for the past 5 years. Certain information
       reflects financial results for a single Portfolio share outstanding
       throughout each year. The total returns in the tables represent the rate
       that an investor would have earned on an investment in a particular
       portfolio (assuming reinvestment of all dividends and distributions).
       This information has been audited by PricewaterhouseCoopers LLP, whose
       report, along with each Portfolio's financial statements, is included in
       the Statement of Additional Information, which is available upon request.
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                     1998          1997          1996          1995          1994
- ---------------------------------------------------------------------------------------------------
<S>                                <C>           <C>           <C>           <C>           <C>
Net asset value, beginning of
 year............................  $   1.00      $   1.00      $   1.00      $   1.00      $   1.00
                                   --------      --------      --------      --------      --------
INCOME FROM INVESTMENT
OPERATIONS:
 Net investment income...........     .0523         .0513         .0516         .0547         .0346
 Net realized and unrealized gain
  (loss) on investments..........       -0-           -0-           -0-           -0-           -0-
                                   --------      --------      --------      --------      --------
 Total from investment
  operations.....................     .0523         .0513         .0516         .0547         .0346
                                   --------      --------      --------      --------      --------
LESS DISTRIBUTIONS:
 Dividends paid to stockholders
  from net investment income.....    (.0523)       (.0513)       (.0516)       (.0547)       (.0346)
                                   --------      --------      --------      --------      --------
Net asset value, end of year.....  $   1.00      $   1.00      $   1.00      $   1.00      $   1.00
                                   ========      ========      ========      ========      ========
Total return.....................     5.35%         5.25%         5.29%         5.60%         3.51%
RATIOS/SUPPLEMENTAL DATA:
 Net assets, end of year (in
  000's).........................  $ 58,445      $ 48,104      $ 69,484      $ 36,869      $ 82,969
 Ratio of expenses to average net
  assets.........................     0.25%(1)      0.26%(1)      0.24%(1)      0.24%(1)      0.40%(1)
 Ratio of net investment income
  to average net assets..........     5.22%         5.14%         5.15%         5.40%         3.34%
</TABLE>
 
- --------------------------------------------------------------------------------
 
(1) Without fees waivers for the years ended October 31, 1998, 1997, 1996, 1995
    and 1994, the ratios of expenses to average net assets would have been .40%,
    .41%, .39%, .39% and .42%, respectively.
 
                                       29
<PAGE>   33
 
SHORT U.S. GOVERNMENT SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                       1998          1997          1996          1995          1994
- -----------------------------------------------------------------------------------------------------
<S>                                  <C>           <C>           <C>           <C>           <C>
Net asset value, beginning of
 year..............................  $  10.55      $  10.56      $  10.68      $  10.45      $  10.89
                                     --------      --------      --------      --------      --------
INCOME FROM INVESTMENT OPERATIONS:
 Net investment income.............     .6144         .6273         .6370         .6746         .5396
 Net realized and unrealized gain
  (loss) on investments............     .1100        (.0100)       (.1200)        .2300        (.4400)
                                     --------      --------      --------      --------      --------
 Total from investment
  operations.......................     .7244         .6173         .5170         .9046         .0996
                                     --------      --------      --------      --------      --------
LESS DISTRIBUTIONS:
 Dividends paid to stockholders
  from net investment income.......    (.6144)       (.6273)       (.6370)       (.6746)       (.5396)
                                     --------      --------      --------      --------      --------
Net asset value, end of year.......  $  10.66      $  10.55      $  10.56      $  10.68      $  10.45
                                     ========      ========      ========      ========      ========
Total return.......................     7.08%         6.04%         4.99%         8.94%         0.95%
RATIOS/SUPPLEMENTAL DATA:
 Net assets, end of year (in
  000's)...........................  $114,240      $112,304      $176,892      $167,343      $179,740
 Ratio of expenses to average net
  assets...........................     0.50%         0.50%         0.48%         0.49%         0.47%
 Ratio of net investment income to
  average net assets...............     5.83%         5.97%         6.02%         6.42%         5.04%
 Portfolio turnover rate...........       84%           75%           69%          112%          195%
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       30
<PAGE>   34
 
ADJUSTABLE RATE MORTGAGE (ARM) PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                     1998          1997          1996          1995           1994
- -----------------------------------------------------------------------------------------------------
<S>                                <C>           <C>           <C>           <C>           <C>
Net asset value, beginning of
  year.........................    $   9.99      $   9.95      $   9.94      $   9.78      $    10.02
                                   --------      --------      --------      --------      ----------
INCOME FROM INVESTMENT
  OPERATIONS:
  Net investment income........       .5676         .6036         .5958         .6035           .4396
  Net realized and unrealized
     gain (loss) on
     investments...............      (.0800)        .0400         .0100         .1600          (.2400)
                                   --------      --------      --------      --------      ----------
  Total from investment
     operations................       .4876         .6436         .6058         .7635           .1996
                                   --------      --------      --------      --------      ----------
LESS DISTRIBUTIONS:
  Dividends paid to
     stockholders
     from net investment
       income..................      (.5676)       (.6036)       (.5958)       (.6035)         (.4396)
                                   --------      --------      --------      --------      ----------
Net asset value, end of year...    $   9.91      $   9.99      $   9.95      $   9.94      $     9.78
                                   ========      ========      ========      ========      ==========
Total return...................       5.00%         6.65%         6.27%         8.02%           2.04%
RATIOS/SUPPLEMENTAL DATA:
  Net assets, end of year (in
     000's)....................    $895,550      $751,334      $796,016      $891,538      $1,045,914
  Ratio of expenses to average
     net assets................       0.49%(1)      0.49%(1)      0.47%(1)      0.48%(1)        0.47%(1)
  Ratio of net investment
     income to average net
     assets....................       5.70%         6.07%         6.01%         6.12%           4.40%
  Portfolio turnover rate......         53%           74%           60%           68%             65%
</TABLE>
 
- --------------------------------------------------------------------------------
 
(1) Without fee waivers for the years ended October 31, 1998, 1997, 1996, 1995
    and 1994, the ratios of expenses to average net assets would have been .79%,
    .79%, .77%, .78% and .76%, respectively.
 
                                       31
<PAGE>   35
 
INTERMEDIATE MORTGAGE SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                         1998         1997         1996          1995          1994
- -----------------------------------------------------------------------------------------------------
<S>                                     <C>          <C>          <C>          <C>           <C>
Net asset value, beginning of
  year..............................    $  9.62      $  9.52      $  9.68      $   9.34      $  10.00
                                        -------      -------      -------      --------      --------
INCOME FROM INVESTMENT OPERATIONS:
  Net investment income.............      .5932        .6245        .6101         .6211         .5407
  Net realized and unrealized gain
     (loss) on investments..........      .0761        .1000       (.1600)        .3400        (.6600)
                                        -------      -------      -------      --------      --------
  Total from investment
     operations.....................      .6693        .7245        .4501         .9611        (.1193)
                                        -------      -------      -------      --------      --------
LESS DISTRIBUTIONS:
  Dividends paid to stockholders:
  From net investment income........     (.5932)      (.6245)      (.6101)       (.6211)       (.5407)
  In excess of net investment
     income.........................     (.0361)         -0-          -0-           -0-           -0-
                                        -------      -------      -------      --------      --------
  Total distributions to
     stockholders...................     (.6293)      (.6245)      (.6101)       (.6211)       (.5407)
                                        -------      -------      -------      --------      --------
Net asset value, end of year........    $  9.66      $  9.62      $  9.52      $   9.68      $   9.34
                                        =======      =======      =======      ========      ========
Total return........................      7.18%        7.90%        4.82%        10.63%        (1.18%)
RATIOS/SUPPLEMENTAL DATA:
  Net assets, end of year (in
     000's).........................    $99,438      $77,982      $92,289      $187,087      $213,427
  Ratio of expenses to average net
     assets.........................      0.49%(1)     0.49%(1)     0.44%(1)      0.38%(1)      0.39%(1)
  Ratio of net investment income to
     average net assets.............      6.17%        6.58%        6.38%         6.55%         5.61%
  Portfolio turnover rate...........        69%         120%         133%          133%          358%
</TABLE>
 
- --------------------------------------------------------------------------------
 
(1) Without fee waivers for the years ended October 31, 1998, 1997, 1996, 1995
    and 1994, the ratios of expenses to average net assets would have been .59%,
    .59%, .58%, .58% and .59%, respectively.
 
                                       32
<PAGE>   36
 
U.S. GOVERNMENT MORTGAGE SECURITIES PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                              1998      1997      1996      1995      1994
- --------------------------------------------------------------------------------------------
<S>                                          <C>       <C>       <C>       <C>       <C>
Net asset value, beginning of year.........  $ 10.67   $ 10.51   $ 10.68   $ 10.23   $ 11.28
                                             -------   -------   -------   -------   -------
INCOME FROM INVESTMENT OPERATIONS:
 Net investment income.....................    .6947     .7344     .7479     .7703     .7296
 Net realized and unrealized gain (loss) on
  investments..............................    .0877     .1600    (.1700)    .4500    (.9300)
                                             -------   -------   -------   -------   -------
 Total from investment operations..........    .7824     .8944     .5779    1.2203    (.2004)
                                             -------   -------   -------   -------   -------
LESS DISTRIBUTIONS:
 Dividends paid to stockholders:
 From net investment income................   (.6947)   (.7344)   (.7479)   (.7703)   (.7296)
 In excess of net investment income........   (.0277)      -0-       -0-       -0-       -0-
 From net realized gains...................      -0-       -0-       -0-       -0-    (.1200)
                                             -------   -------   -------   -------   -------
 Total distributions to stockholders.......   (.7224)   (.7344)   (.7479)   (.7703)   (.8496)
                                             -------   -------   -------   -------   -------
 Net asset value, end of year..............  $ 10.73   $ 10.67   $ 10.51   $ 10.68   $ 10.23
                                             =======   =======   =======   =======   =======
 Total return..............................    7.58%     8.87%     5.63%    12.37%    (1.82%)
RATIOS/SUPPLEMENTAL DATA:
 Net assets, end of year (in 000's)........  $80,174   $53,572   $57,267   $62,258   $60,613
 Ratio of expenses to average net assets...    0.53%     0.53%     0.52%     0.53%     0.51%
 Ratio of net investment income to average
  net assets...............................    6.48%     7.01%     7.10%     7.39%     6.81%
 Portfolio turnover rate...................      93%      135%      165%      177%      376%
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       33
<PAGE>   37
 
 -------------------------------------------------------------------------------
 
                            NEW ACCOUNT APPLICATION
                       ASSET MANAGEMENT FUND, INC. (AMF)
 
I.  HOW TO OPEN YOUR AMF ACCOUNT AND PURCHASE SHARES
 
   -  Please complete the requested information. You may call toll free to open
      a temporary account, 1-800-527-3713, or fax your completed application to
      (312) 214-1424. Mail the original completed application to the Fund's
      distributor, Shay Financial Services, Inc., 230 W. Monroe Street, Chicago,
      IL 60606. Your new AMF account number will be assigned.
 
   TO PLACE YOUR ORDER
 
   -  Call toll free 1-800-527-3713 to place your order and confirm wire
      instructions.
 
   -  Wire funds to:
      PFPC Trust Company, ABA 031 000 053
      BNF Mutual Fund Services / 8529992181
      Portfolio Name (Money Market Portfolio, Short U.S. Government Securities
      Portfolio,
           Adjustable Rate Mortgage (ARM) Portfolio, Intermediate Mortgage
      Securities
           Portfolio or U.S. Government Mortgage Securities Portfolio)
      Customer Name
      Account Number
 
   -  Written confirmations and monthly statements of your AMF transactions will
      be mailed to you.
 
II. ACCOUNT REGISTRATION
 
   Name of Institution
   -----------------------------------------------------------------------------
   Attention
   -----------------------------------------------------------------------------
   E-Mail Address
   -----------------------------------------------------------------------------
   Mailing Address
   -----------------------------------------------------------------------------
 
   -----------------------------------------------------------------------------
 
   -----------------------------------------------------------------------------
   Phone Number
   -----------------------------------------------------------------------------
   Fax Number
   -----------------------------------------------------------------------------
 
   Tax Identification Number
   -----------------------------------------------------------------------------
<PAGE>   38
 
 -------------------------------------------------------------------------------
 
III. REDEMPTION
 
   Please provide complete instructions for wiring of redemption proceeds in
     Federal funds to your account with a bank or trust company.
 
   Name of Bank
   or Trust Company
   -----------------------------------------------------------------------------
 
   Street Address
   -----------------------------------------------------------------------------
 
   City, State, Zip
   -----------------------------------------------------------------------------
 
   ABA Number
   -----------------------------------------------------------------------------
 
   Account Name
   -----------------------------------------------------------------------------
 
   Account Number
   -----------------------------------------------------------------------------
 
IV. DIVIDENDS
 
    Please select "Cash" or "Reinvest" for your dividend distributions.  [
    ] Cash  [ ] Reinvest
 
V. PHONE ORDER AUTHORIZATIONS
 
   Please list individuals (up to three) who are authorized to make purchases
   and redemptions by phone:
 
   -  Name
   -----------------------------------------------------------------------------
 
      Phone
   -----------------------------------------------------------------------------
 
   -  Name
   -----------------------------------------------------------------------------
 
      Phone
   -----------------------------------------------------------------------------
 
   -  Name
   -----------------------------------------------------------------------------
 
      Phone
   -----------------------------------------------------------------------------
 
AUTHORIZED SIGNATURE
- --------------------------------------------------------------------------------
 
Name (print or type)
- --------------------------------------------------------------------------------
 
Title
- --------------------------------------------------------------------------------
 
Phone Number
- --------------------------------------------------------------------------------
 
Date
 
- --------------------------------------------------------------------------------
<PAGE>   39
 
SHAREHOLDER REFERENCE INFORMATION
- --------------------------------------------------------------------------------
 
DISTRIBUTOR
Shay Financial Services, Inc.
230 West Monroe Street
Chicago, Illinois 60606
Investment Adviser
Shay Assets Management, Inc.
230 West Monroe Street
Chicago, Illinois 60606
 
ADMINISTRATOR AND TRANSFER AND
DIVIDEND AGENT
PFPC Inc.
103 Bellevue Parkway
Wilmington, Delaware 19809
 
LEGAL COUNSEL
Vedder, Price, Kaufman & Kammholz
222 North LaSalle Street
Chicago, Illinois 60601
 
Custodian
PFPC Trust Company
17th & Chestnut Streets
Philadelphia, Pennsylvania 19101
 
INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
2400 Eleven Penn Center
Philadelphia, Pennsylvania 19103

DIRECTORS AND OFFICERS
Richard M. Amis
Director
 
Arthur G. De Russo
Director
 
David F. Holland
Director
 
Gerald J. Levy
Director and Vice Chairman
 
Rodger D. Shay
Director and Chairman
 
Edward E. Sammons, Jr.
President and Treasurer
 
Robert T. Podraza
Vice President and Assistant Treasurer
 
Daniel K. Ellenwood
Secretary
 
Doris J. Pavel
Assistant Secretary
 
Additional information about the Portfolios' may be found in the Statement of
Additional Information. The Statement of Additional Information contains more
detailed information on fund investments and operations. The semiannual and
annual shareholder reports contain a discussion of the market conditions and the
investment strategies that significantly affected the Portfolios' performance
during the last fiscal year, as well as a listing of portfolio holdings and
financial statements. These documents may be obtained without charge from the
following sources:
 
By Phone:
1-800-527-3713
 
By Mail:
Shay Financial Services, Inc.
Attn: Asset Management Fund, Inc.
230 West Monroe Street
Chicago, IL 60606
 
Public Reference Section
Securities and Exchange Commission
Washington, D.C. 20549-6009
(a duplication fee is charged)
In Person:
 
Public Reference Room
Securities and Exchange Commission,
Washington, D.C.
(Call 1-800-SEC-0330 for more information)
 
By Internet:
 
http://www.amffunds.com
http://www.sec.gov
 
The Statement of Additional Information is incorporated by reference into this
prospectus (is legally a part of this prospectus).
 
Investment Company Act file number:    Asset Management Fund, Inc.   811-3541
<PAGE>   40
 




                      [ASSET MANAGEMENT FUND, INC. LOGO]

           230 West Monroe Street, Chicago, IL 60606 - 1-800-527-3713


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