THOMPSON PLUMB FUNDS INC
497, 1999-04-02
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<PAGE>   1
                                                                     Rule 497(c)

                           THOMPSON PLUMB FUNDS, INC.
              1200 JOHN Q. HAMMONS DRIVE - MADISON, WISCONSIN 53717 - 
                        (608) 831-1300 - (800) 999-0887

                                   PROSPECTUS
                                  APRIL 1, 1999


         THOMPSON PLUMB FUNDS, INC. offers the following no-load mutual funds:

                  -        Thompson Plumb Growth Fund

                  -        Thompson Plumb Balanced Fund

                  -        Thompson Plumb Bond Fund

         All of the funds are managed by Thompson, Plumb & Associates, Inc.















         The Securities and Exchange Commission has not approved or disapproved
these securities or determined if this prospectus is accurate or complete.
Anyone who tells you otherwise is committing a crime.


<PAGE>   2


                                TABLE OF CONTENTS

                                                                      PAGE

RISK/RETURN SUMMARY..............................................      3
         Thompson Plumb Growth Fund..............................      3
         Thompson Plumb Balanced Fund............................      6
         Thompson Plumb Bond Fund................................      9

FEES AND EXPENSES................................................     12

INVESTMENT OBJECTIVES, POLICIES AND RISKS........................     14
         Growth Fund.............................................     14
         Balanced Fund...........................................     16
         Bond Fund...............................................     18
         Risks...................................................     20

MANAGEMENT.......................................................     22
         Investment Advisor......................................     22
         Portfolio Managers......................................     22

HOW TO BUY SHARES................................................     23
         General.................................................     23
         Purchase Procedures.....................................     23
         Exchange of Fund Shares.................................     26
         Availability of Money Market Fund.......................     27

HOW TO SELL SHARES...............................................     28
         General.................................................     28
         Redemption Procedures...................................     28
         Receiving Redemption Proceeds...........................     29
         Other Redemption Information............................     30

OTHER INFORMATION................................................     32
         Determination of Net Asset Value........................     32
         Dividends and Distributions.............................     32
         Taxes...................................................     32
         Retirement Plans........................................     33
         Year 2000 Compliance....................................     33

FINANCIAL HIGHLIGHTS.............................................     35


                                       2
<PAGE>   3


                               RISK/RETURN SUMMARY


THOMPSON PLUMB GROWTH FUND

         Investment Objective/Goals. The Growth Fund seeks a high level of
long-term growth primarily through capital appreciation, while at the same time
assuming reasonable risk. The Growth Fund invests primarily in a diversified
portfolio of common stocks and securities convertible into common stocks.
Although current income is not its primary objective, the Growth Fund
anticipates that capital growth is accompanied by growth through dividend
income.

         We invest in common stocks that possess most of the following
characteristics:

         -    Leading market positions
         -    High barriers to entry and other competitive or technological 
              advantages
         -    High returns on equity and assets
         -    Good growth prospects
         -    Strong management
         -    Relatively low debt burdens

         To achieve a better risk-adjusted return on its equity investments, the
Growth Fund invests in many types of stocks, including a blend of large company
stocks, small company stocks, growth stocks and value stocks. We believe that
holding a diverse group of stocks will provide competitive returns under
different market environments, as opposed to more narrow investment styles. Our
flexible approach to equity investing enables us to adapt to changing market
trends and conditions and to invest wherever we believe opportunity exists.

         The Growth Fund is suitable if you are looking for capital appreciation
by investing in a diverse group of stocks, and have a long-term perspective.

         Risks. An investment in the Growth Fund is subject to risks, including
the possibility that its share price and total return may decline as a result of
a decline in the value of its portfolio of common stocks. As a result, loss of
money is a risk of investing in the Growth Fund. The common stocks in which the
Growth Fund invests fluctuate in value due to changes in the securities markets,
general economic conditions and factors that particularly affect the issuers of
these stocks and their industries. In addition, we may buy common stocks of
companies with small market capitalizations which involve more risk than
investments in larger companies because their shares may be subject to greater
price fluctuation, and may have less market liquidity.

                                       3
<PAGE>   4


         Past Performance. The tables below provide some indication of the risks
of investing in the Fund by showing how the Fund's total returns have varied
from year to year and how the Fund's average annual total returns compare to a
broader measure of market performance. As with all mutual funds, past
performance is not an indication of the future.


                                   GROWTH FUND
                           YEAR-BY-YEAR TOTAL RETURNS

                                  [BAR GRAPH]

<TABLE>
<S>      <C>  
1993      1.60%
1994      0.43% 
1995     30.49%
1996     33.05% 
1997     32.37% 
1998     18.41% 
</TABLE>


                                  CALENDAR YEAR

         The Fund's highest/lowest quarterly results during this period were:

                  Highest: 25.00%   (quarter ended 12/31/98)
                  Lowest:  -14.72%  (quarter ended 9/30/98)

                                       4
<PAGE>   5


                                   GROWTH FUND
                           AVERAGE ANNUAL TOTAL RETURN
                           (THROUGH DECEMBER 31, 1998)

<TABLE>
<CAPTION>
                            1 Year       5 Year       Since Inception (2/10/92)
                            ------       ------       -------------------------
<S>                         <C>          <C>                       <C>   
Growth Fund                 18.41%       22.27%                    16.53%
S&P 500 Index(1)            28.58%       24.09%                    19.91%
</TABLE>



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

(1)      The S&P 500 Index is an unmanaged index of 500 U.S. stocks chosen for
         market size, liquidity and industry group representation and is a
         widely used benchmark of U.S. equity performance.

                                       5
<PAGE>   6


THOMPSON PLUMB BALANCED FUND

         Investment Objective/Goal. The Balanced Fund seeks a combination of
income and capital appreciation which will result in the highest total return,
while assuming reasonable risk. The Balanced Fund invests in a diversified
portfolio of common stocks and fixed income securities. We select securities
that, in our judgment, will result in the highest total return consistent with
preservation of principal, and we vary the mix of common stocks and bonds from
time to time. A major portion of the Balanced Fund's assets is normally invested
in common stocks.

         We invest in common stocks that possess most of the following
characteristics:

         -    Leading market positions
         -    High barriers to entry and other competitive or technological 
              advantages
         -    High returns on equity and assets
         -    Good growth prospects
         -    Strong management
         -    Relatively low debt burdens

         To achieve a better risk-adjusted return on its equity investments, the
Balanced Fund invests in many types of stocks, including a blend of large
company stocks, small company stocks, growth stocks and value stocks. We believe
that holding a diverse group of stocks will provide competitive returns under
different market environments, as opposed to more narrow investment styles. Our
flexible approach to equity investing enables us to adapt to changing market
trends and conditions and to invest wherever we believe opportunity exists.

         We also invest a significant portion of the Balanced Fund's assets in
fixed income securities, all of which are investment grade. The fixed income
securities in which the Fund may invest include corporate notes, bonds and
debentures, short-term debt instruments, mortgage-related securities, debt
securities issued or guaranteed by the U.S. Government (including its agencies
and instrumentalities), convertible debt securities and preferred stock that is
convertible into common stock. In establishing what we think is the appropriate
mix of equity and fixed income investments for the Balanced Fund, we assess
general economic conditions, anticipated future changes in interest rates and
the outlook for common stocks generally. The dollar-weighted average portfolio
maturity of the fixed income securities held by the Fund will normally not
exceed 10 years.

         The Balanced Fund is suitable if you are looking for a mix of stocks
and bonds and have a long-term perspective.

         Risks. An investment in the Balanced Fund is subject to risks,
including the possibility that its share price and total return may decline
because of a decline in the value of its portfolio of common stocks and fixed
income securities. As a result, loss of money is a risk of investing in the
Balanced Fund. The common stocks in which the Balanced Fund invests fluctuate in
value due to changes in the securities markets, general economic conditions and

                                       6
<PAGE>   7

factors that particularly affect the issuers of these stocks and their
industries. In addition, we may buy common stocks of companies with small market
capitalizations which involve more risk than investments in larger companies
because their shares may be subject to greater price fluctuation, and may have
less market liquidity.

         The value of the fixed income securities held by the Balanced Fund is
affected primarily by changes in interest rates, average maturities and the
investment and credit quality of the securities. Bond prices generally move in
the opposite direction of interest rate levels, and movements in interest rates
typically have a greater effect on the prices of long-term bonds than those of
shorter maturities.

         Past Performance. The tables below provide some indication of the risks
of investing in the Fund by showing how the Fund's total returns have varied
from year to year and how the Fund's average annual total returns compare to
broader measures of market performance. As with all mutual funds, past
performance is not an indication of the future.


                                  BALANCED FUND
                           YEAR-BY-YEAR TOTAL RETURNS

                                  [BAR GRAPH]

<TABLE>
<S>       <C>        
1989      19.97%     
1990       3.10%
1991      27.01%
1992       2.26%
1993       4.45%
1994       1.47%
1995      20.03%
1996      23.09%
1997      22.54% 
1998      16.84% 
</TABLE>


                                  CALENDAR YEAR

         The Fund's highest/lowest quarterly results during this 10-year period
were:

                  Highest: 19.41%   (quarter ended 12/31/98)
                  Lowest:  -11.15%  (quarter ended 9/30/98)

                                       7
<PAGE>   8


                                  BALANCED FUND
                           AVERAGE ANNUAL TOTAL RETURN
                           (THROUGH DECEMBER 31, 1998)

<TABLE>
<CAPTION>
                                       1 Year             5 Year              10 Year
                                       ------             ------              -------
<S>                                    <C>                <C>                 <C>   
Balanced Fund                          16.84%             16.51%              13.67%
S&P 500 Index (1)                      28.58%             24.09%              19.22%
Lehman Brothers Govt./Corp.             8.44%              6.60%               8.52%
Intermediate Bond Index(2)
</TABLE>

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

(1)      The S&P 500 Index is an unmanaged index of 500 U.S. stocks chosen for
         market size, liquidity and industry group representation, and is a
         widely used benchmark of U.S. equity performance.

(2)      The Lehman Brothers Government/Corporate Intermediate Bond Index is an
         index of all investment grade bonds with maturities of more than one
         year and less than 10 years.

                                       8
<PAGE>   9


THOMPSON PLUMB BOND FUND

         Investment Objective/Goal. The Bond Fund seeks a high level of current
income while preserving capital. The Bond Fund invests primarily in a
diversified portfolio of investment-grade debt securities.

         We invest at least 65%, and normally almost all, of the Bond Fund's
total assets in corporate debt securities and securities issued or guaranteed by
the U.S. Government or its agencies or instrumentalities. The dollar-weighted
average portfolio maturity of the Bond Fund will normally not exceed 10 years.
We do not purchase securities with a view to rapid turnover. The fixed income
securities in which the Bond Fund may invest include corporate notes, bonds and
debentures, short-term debt instruments, mortgage-related securities, U.S.
Treasury securities and other debt securities issued or guaranteed by the U.S.
Government (including its agencies and instrumentalities).

         The Bond Fund is suitable if you are looking for current income through
investment-grade debt securities.

         Risks. The share price, total return and yield of the Bond Fund will
fluctuate depending on changes in the market value and yields of the fixed
income securities in the Fund's portfolio. As a result, loss of money is a risk
of investing in the Bond Fund. The value of fixed income securities is affected
primarily by changes in interest rates, average maturities and the investment
and credit quality of the securities. A bond's market value increases or
decreases in order to adjust its yield to current interest rate levels. A bond's
yield reflects the bond's fixed annual interest as a percentage of its current
price. Therefore, bond prices generally move in the opposite direction of
interest rates and movements in interest rates typically have a greater effect
on prices of longer term bonds than on those with shorter maturities. Changes in
prevailing interest rates will also affect the yield on Bond Fund shares.
Interest rate fluctuations, however, will not affect the income received by the
Bond Fund from its existing portfolio of fixed income securities (other than
from variable rate securities).

                                       9
<PAGE>   10


         Past Performance. The tables below provide some indication of the risks
of investing in the Fund by showing how the Fund's total returns have varied
from year to year and how the Fund's average annual total returns compare to a
broader measure of market performance. As with all mutual funds, past
performance is not an indication of the future.


                                    BOND FUND
                           YEAR-BY-YEAR TOTAL RETURNS

                                  [BAR GRAPH]

<TABLE>
<S>       <C>  
1993      8.18%
1994     -2.67%
1995     14.47% 
1996      1.83%
1997      7.42%
1998      8.71%
</TABLE>

                     
                                  CALENDAR YEAR

         The Fund's highest/lowest quarterly results during this period were:

                  Highest: 5.13%    (quarter ended 9/30/98)
                  Lowest:  -2.47%   (quarter ended 3/31/94)

                                       10
<PAGE>   11


                                    BOND FUND
                           AVERAGE ANNUAL TOTAL RETURN
                           (THROUGH DECEMBER 31, 1998)

<TABLE>
<CAPTION>
                                                 1 Year                5 Year      Since Inception (2/10/92)
                                                 ------                ------      -------------------------
<S>                                            <C>                   <C>           <C>  
Bond Fund                                        8.71%                 5.79%                     6.22%
Lehman Brothers Govt./Corp.
Intermediate Bond Index(1)                       8.44%                 6.60%                     7.16%
</TABLE>


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

(1)      The Lehman Brothers Government/Corporate Intermediate Bond Index is an
         index of all investment grade bonds with maturities of more than one
         year and less than 10 years.

                                       11
<PAGE>   12


                                FEES AND EXPENSES

         This summary describes the fees and expenses that you may pay if you
buy and hold shares of the Funds.

         SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT). Because the
funds are no-load funds, you pay no fee or sales charges when you buy, sell or
exchange shares. However, you will be charged a fee (currently $12.00) when you
have redemption proceeds paid to you by wire transfer.

ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)

<TABLE>
<CAPTION>
                                                                    GROWTH             BALANCED           BOND
                                                                     FUND                FUND             FUND
                                                                     ----                ----             ----
<S>                                                                 <C>                <C>               <C>  
Management Fees                                                      0.99%              0.85%             0.65%
Distribution (12b-1) Fees                                            None                None             None
Other Expenses                                                       0.42%              0.45%             0.43%
                                                                    -------            -------           -------
Total Annual Fund Operating Expenses                                 1.41%              1.30%             1.08%
Fee Waiver and/or Expense                                           (0.11)%            (0.05)%           (0.13)%
                                                                    -------            -------           -------
Reimbursement (1)
Net Expenses                                                         1.30%              1.25%             0.95%
</TABLE>

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

(1)      The Advisor has contractually agreed to waive management fees and/or
         reimburse expenses incurred by the Funds through March 31, 2000 so that
         the operating expenses of the funds do not exceed the following
         percentages of their respective average daily net assets: Growth Fund -
         1.30%; Balanced Fund - 1.25% and Bond Fund - 0.95%.

Example:

         This example is intended to help you compare the cost of investing in
the Funds with the cost of investing in other mutual funds. The example assumes
that you invest $10,000 in each Fund for the time periods indicated and then
redeem (or sell) all of your shares at the end of those time periods. The
example also assumes that your investment has a 5% return each year and that
each Fund's operating expenses remain the same. The assumed return does not
represent actual or future performance and your actual costs may be higher or
lower. However, based on these assumptions, your costs would be:

                                       12
<PAGE>   13


<TABLE>
<CAPTION>
                           1 YEAR                 3 YEARS               5 YEARS                10 YEARS
                           ------                 -------               --------               --------
<S>                       <C>                    <C>                   <C>                    <C>   
Growth Fund                $132                   $435                  $761                   $1,681

Balanced Fund              $127                   $407                  $708                   $1,563

Bond Fund                  $97                    $322                  $565                   $1,263
</TABLE>



                                       13

<PAGE>   14


                    INVESTMENT OBJECTIVES, POLICIES AND RISKS

GROWTH FUND

         Objective and Principal Strategies. The Growth Fund seeks a high level
of long-term growth primarily through capital appreciation, while at the same
time assuming reasonable risk. The Growth Fund invests primarily in a
diversified portfolio of common stocks and securities convertible into common
stocks. Although current income is not a primary objective of the Growth Fund,
the Fund anticipates that capital growth will be accompanied by growth through
dividend income. The term "reasonable risk" refers to our judgment that
investments in certain common stocks would not present a greater than normal
risk of loss in light of current and reasonably anticipated future general
market and economic conditions, trends in dividend yields and interest rates,
and fiscal and monetary policies. We generally seek to identify investment
opportunities in equity securities of companies which we believe have
above-average potential for earnings and dividend growth.

         We invest in common stocks that possess most of the following
characteristics:

          -         Leading market positions
          -         High barriers to entry and other competitive or 
                    technological advantages
          -         High returns on equity and assets
          -         Good growth prospects
          -         Strong management
          -         Relatively low debt burdens

         To achieve a better risk-adjusted return on its equity investments, the
Growth Fund invests in many types of stocks, including a blend of large company
stocks, small company stocks, growth stocks and value stocks. We believe that
holding a diverse group of stocks will provide competitive returns under
different market conditions and trends, as opposed to more narrow investment
styles. Our flexible approach to equity investing enables us to adapt to
changing market trends and conditions and to invest wherever we believe
opportunity exists.

         We do not purchase smaller company stocks (companies whose market
capitalizations are less than $1 billion) if, at the time of purchase, the
aggregate investment in such securities would exceed one-third of the total
assets of the Fund. We believe that our policies of issuer and industry
diversification, together with strategic investment in short-term debt
investments and fixed income securities, can limit the volatility of investments
in these smaller companies.

         Any assets not invested in common stocks and securities convertible
into common stocks will be invested in income producing short-term debt
instruments as a reserve for future purchases of securities. The Growth Fund may
also invest in convertible preferred and convertible fixed income securities. We
intend generally to limit the Growth Fund's purchase of these securities to
those which are investment grade, that is, rated in one of the four highest
rating categories by Standard & Poor's (S&P) or Moody's Investors Service, Inc.
(Moody's).

                                       14
<PAGE>   15

         Risks. The share price and total return of the Growth Fund will
increase or decrease depending on changes in the value of the common stocks on
its portfolio. See "Risks" below.



                                       15
<PAGE>   16


BALANCED FUND

         Objective and Principal Strategies. The Balanced Fund seeks a
combination of income and capital appreciation which will result in highest
total return, while assuming reasonable risk. The Fund invests in both common
stocks and fixed income securities. We vary the mix of stocks and bonds from
time to time, depending on our assessment of economic conditions and investment
opportunities. The term "reasonable risk" refers to our judgment that
investments in certain securities would not present a greater than normal risk
of loss in light of current and reasonably anticipated future general market and
economic conditions, trends in dividend yields and interest rates, and fiscal
and monetary policies. A major portion of the Balanced Fund's assets will
normally be invested at all times in common stocks. As of March 1, 1999,
approximately 71% of the total assets of the Balanced Fund were invested in
common stocks.

         We invest in common stocks that possess most of the following
characteristics:

          -         Leading market positions
          -         High barriers to entry and other competitive or 
                    technological advantages
          -         High returns on equity and assets
          -         Good growth prospects
          -         Strong management
          -         Relatively low debt burdens

         To achieve a better risk-adjusted return on its equity investments, the
Balanced Fund invests in many types of stocks, including a blend of large
company stocks, small company stocks, growth stocks and value stocks. We believe
that holding a diverse group of stocks will provide competitive returns under
different market conditions and trends, as opposed to more narrow investment
styles. Our flexible approach to equity investing enables us to adapt to
changing market trends and conditions and to invest wherever we believe
opportunity exists. We do not purchase smaller company stocks (companies whose
market capitalizations are less than $1 billion) if, at the time of purchase,
the aggregate investment in such securities would exceed one-third of the total
assets of the Fund. We believe that our policies of issuer and industry
diversification, together with strategic investment in short-term debt
investments and fixed income securities, can limit the volatility of investments
in these smaller companies.

         To provide balance, the Fund also invests a significant portion of its
assets in fixed income securities such as corporate notes, bonds and debentures,
short-term debt instruments, debt securities issued or guaranteed by the U.S.
Government (including its agencies and instrumentalities), convertible debt
securities and preferred stock that is convertible into common stock. All of the
debt securities purchased by the Balanced Fund are investment grade. Investment
grade securities are those rated in the four highest rating categories by S&P or
Moody's, which means that the issuers of those securities have adequate to
extremely strong capacity to pay interest and repay principal. The corporate
debt securities in which the Balanced Fund invests are generally to those issued
by established companies. In addition, we ordinarily invest only in non-callable
bonds (debt that may not be prepaid by the issuer). 


                                       16
<PAGE>   17

This eliminates prepayment risk which would otherwise increase the price
sensitivity and volatility of the debt securities in the Fund's portfolio.

         Ordinarily, at least 25% of the total assets of the Balanced Fund are
invested in fixed income securities. However, we may invest more of the Fund's
assets in fixed income securities if and when we determine, based on our
assessment of prevailing market conditions, that fixed income securities provide
a more effective means than common stocks of achieving the Fund's investment
objective. In determining whether the Balanced Fund should shift its emphasis
from common stocks to fixed income securities, we assess anticipated future
changes in interest rates and the outlook for common stocks generally.

         The dollar-weighted average portfolio maturity of the fixed income
securities held by the Fund will normally not exceed 10 years. We actively
manage the portfolio maturity of the debt securities in the Fund's portfolio,
consistent with its investment objective, according to our assessment of the
interest rate outlook. During periods of rising interest rates, we will likely
attempt to shorten the average maturity of the portfolio to cushion the effect
of falling bond prices on the Fund's share price. When interest rates are
falling and bond prices are increasing, on the other hand, we will likely seek
to lengthen the average maturity.

         Risks. The Balanced Fund's share price and total return will increase
or decrease depending on changes in the value of its portfolio of common stocks
and fixed income securities. See "Risks" below.

                                       17
<PAGE>   18


BOND FUND

         Objective and Principal Strategies. The Bond Fund seeks a higher level
of current income, while at the same time preserving investment capital. The
Bond Fund invests primarily in a diversified portfolio of investment-grade debt
securities. Such securities include the following types:

         -     Debt securities of domestic issuers, and of foreign issuers
               payable in U.S. dollars (corporate debt securities) rated at the
               time of purchase within the four highest grades by either S&P or
               Moody's;

         -     Securities issued or guaranteed by the U.S. Government or its
               agencies or instrumentalities, including mortgage-related
               securities issued or guaranteed by the U.S. Government, its
               agencies or instrumentalities; such as GNMA certificates;

         -     Mortgage-related securities issued or guaranteed by private
               issuers and guarantors rated at the time of purchase within the
               four highest grades by S&P or Moody's;

         -     Commercial paper rated within the two highest categories for
               commercial paper or short-term debt securities by either S&P or
               Moody's at the time of purchase;

         -     Obligations of banks and thrifts whose deposits are insured by
               the FDIC;

         -     Short-term corporate obligations, including variable rate demand
               notes if the issuer has commercial paper or short-term debt
               securities rated within the two highest categories by either S&P
               or Moody's at the time of purchase.

         At least 65%, and normally almost all, of the Bond Fund's total assets
will be invested in corporate debt securities and securities issued or
guaranteed by the U.S. Government or its agencies or instrumentalities. It is
anticipated that the Bond Fund's investments in U.S. Government securities will
primarily consist of those supported by the full faith and credit of the U.S.
Treasury.

         Although there are no restrictions on the maturity of securities in
which the Bond Fund may investment, it is anticipated that during normal market
conditions, the dollar-weighted average portfolio maturity of the Fund will not
exceed 10 years. In calculating average maturity, the stated final maturity date
of a security is used, unless it is probable that the issuer will shorten the
maturity, in which case the date on which it is probable that the issuer will
call, refund or redeem the security is used. The Bond Fund will not purchase
securities with a view to rapid turnover. We actively manage the portfolio
maturity of the debt securities in the Fund's portfolio, consistent with its
investment objective, according to our assessment of the interest rate outlook.
During periods of rising interest rates, we will likely attempt to shorten the
average maturity of the portfolio to cushion the effect of falling bond prices
on the 

  
                                     18
<PAGE>   19

Fund's share price. When interest rates are falling and bond prices are
increasing, on the other hand, we will likely seek to lengthen the average
maturity.

         Risks. The share price, yield and total return of the Bond Fund will
increase or decrease depending on changes in the value of, and interest rates
and yield on, the fixed income securities in the Bond Fund's portfolio. See
"Risks" below.

                                       19
<PAGE>   20


RISKS

         Common Stocks. The Growth Fund and Balanced Fund invest in common
stocks. Common stocks fluctuate in value for various reasons, including changes
in the equities markets, general economic or political changes, interest rate
changes and factors particularly affecting the issues of stocks and their
industries. In addition, we may invest some of the Growth and Balanced Funds'
assets in stocks of companies with small market capitalizations (under $1
billion) and which may be traded only in the over-the-counter market. We believe
smaller companies are often undervalued in the marketplace and therefore carry a
greater potential for capital appreciation. However, stocks of smaller companies
are subject to greater price volatility than stocks of large companies and may
have less market liquidity.

         Fixed Income Securities. The total return realized on the Bond Fund and
on the fixed income portion of the Balanced Fund's portfolio consists of the
change in the value of the fixed income securities held by the Funds and the
income generated by those securities. The value of fixed income securities is
affected primarily by changes in interest rates, average maturities, the
securities' investment quality and the creditworthiness of the issuer.

         A bond's yield reflects the fixed annual interest as a percentage of
its current price. The price (the bond's market value) will increase or decrease
in order to adjust the bond's yield to current interest rate levels. Therefore,
bond prices generally move in the opposite direction of interest rates. As a
result, interest rate fluctuations will affect the net asset values of the
Balanced and the Bond Funds, but will not affect the interest income received by
those Funds from their existing portfolio of fixed income securities. However,
changes in prevailing interest rates will affect the yield on shares
subsequently issued by those Funds. Movements in interest rates also typically
have a greater effect on the prices of longer term bonds than on those with
shorter maturities.

         Although the Balanced and Bond Funds only buy investment-grade debt
securities, securities rated in the fourth highest investment grade category
(for example, BBB by S&P) may have speculative characteristics and changes in
economic conditions and other circumstances are more likely to lead to a
weakened capacity to make principal and interest payments than is the case with
securities rates in a higher category. In the event a debt security held in a
Fund's portfolio is downgraded to a rating below the lowest category permitted
by the Fund's policy, we will consider this fact together with other relevant
factors in determining whether to continue to hold the security. However,
downgrading alone will not require the sale of the security.

         Securities issued by the U.S. Government, its agencies or
instrumentalities may vary in terms of the degree of support afforded by the
Government. Some of such securities may be supported by the full faith and
credit of the U.S. Treasury, such as U.S. Treasury bills, notes and bonds and
GNMA certificates. Some agency securities are supported by the agency's right to
borrow from the U.S. Treasury under certain circumstances, such as those issued
by the Federal Home Loan Banks, Tennessee Valley Authority or Federal Farm
Credit Bank. Still others are supported only by the discretionary authority to
purchase the agency's obligations, 

                                       20
<PAGE>   21

such as those issued by the Federal National Mortgage Association, or by the
credit of the agency that issued them, such as those issued by the Student Loan
Marketing Association. Because there is no guarantee that the U.S. Government
will provide support to such agencies, such securities may involve risk of loss
of principal and interest. Current market prices for U.S. Government securities
are not guaranteed and the value of such securities will fluctuate.

OTHER STRATEGIES

         Portfolio Turnover. We generally do not purchase securities for
short-term trading. However, when appropriate, we will sell securities without
regard to length of time held. A high portfolio turnover rate may increase
transaction costs, which would adversely affect Fund performance, and result in
increased taxable gains and income to you.

         Change in Investment Objective. Each Fund's investment objective may be
changed by the Board of Directors without shareholder approval. However, the
Board does not plan to change any Fund's objective.

         Temporary Defensive Positions. The Growth and Balanced Funds may
temporarily invest in short-term instruments for defensive purposes in response
to adverse market, economic and other conditions that could expose the Fund to a
decline in value. The Growth Fund may not invest more than 25% of its assets,
and the Balanced Fund may invest without limitation, in short-term instruments
for these purposes. Short-term instruments include commercial paper,
certificates of deposit, U.S. Treasury bills, variable rate demand notes,
repurchase agreements and money market funds. These temporary defensive
positions are inconsistent with the Funds' principal investment strategies and
make it harder for the Funds to achieve their objectives.

                                       21
<PAGE>   22


                                   MANAGEMENT

INVESTMENT ADVISOR

         Thompson Plumb & Associates, Inc. (the Advisor), 1200 John Q. Hammons
Drive, Madison, Wisconsin 53717, acts as investment advisor and administrator
for the Funds. Since 1984, the Advisor has provided investment advice to
individuals and institutional clients with substantial investment portfolios.
The Advisor has managed each Fund since its inception. As of December 31, 1998,
the Advisor had approximately $850 million in assets under management.

         The Advisor manages the investment of the Funds' assets, provides the
Funds with personnel, facilities and administrative services and supervises the
Funds' daily business affairs, all subject to the oversight of the Funds' Board
of Directors.

         During the fiscal year ended November 30, 1998, the Growth Fund,
Balanced Fund and Bond Fund paid management fees to the Advisor of 0.99%, 0.85%
and 0.65%, respectively, of such Fund's average daily net assets during that
year.

PORTFOLIO MANAGERS

         Growth and Bond Funds. John W. Thompson serves as portfolio manager for
the Growth and Bond Funds. He has been sole portfolio manager of these Funds
since August 1993. Prior to that time, he was co-portfolio manager of these
Funds. Mr. Thompson is the Chairman, Secretary and a Director of Thompson Plumb
Funds, Inc. and has been President of the Advisor since co-founding it in June
1984 and its Treasurer since October 1993. Mr. Thompson is a Chartered Financial
Analyst.

         John C. Thompson has served as the associate portfolio manager for the
Growth Fund since June 1998. Mr. Thompson is Assistant Vice President of
Thompson Plumb Funds, Inc. He has worked in various capacities for the Advisor
since 1993, including as a portfolio manager and investment analyst. John C.
Thompson is a Chartered Financial Analyst.

         Balanced Fund. Thomas G. Plumb serves as portfolio manager for the
Balanced Fund. He has been sole portfolio manager of the Balanced Fund since
August 1993. Prior to that time, he was co-portfolio manager of the Fund. Mr.
Plumb is President, Treasurer and a Director of Thompson Plumb Funds, Inc. He
has been Vice President of the Advisor since co-founding it in June 1984. Mr.
Plumb is a Chartered Financial Analyst.


                                       22
<PAGE>   23


                               HOW TO BUY SHARES

GENERAL

         You may buy shares of any Fund without a sales charge. The price you
pay for the shares will be based on the net asset value per share determined at
the end of the business day on which your purchase order is received by Firstar
Mutual Fund Services, LLC (Firstar), the Funds' transfer agent. You need to
complete the Account Application and submit it to Firstar in order to purchase
Fund shares. The Funds reserve the right to reject any purchase order for any
reason.

         Please call Thompson Plumb Funds, Inc. at 1-800-999-0887 or (608)
831-1300 if you have any questions about purchasing shares of the Funds.

         The investment minimums for purchases of shares of a Fund are as
follows:

         To open an account:                $1,000 ($250 for IRAs)

         To add to an account:              $100 ($50 for Automatic Investment 
                                            Plan and Automatic Exchange Plan)

PURCHASE PROCEDURES

         You may buy shares of any Fund in the following ways:

<TABLE>
<CAPTION>
METHOD                                           STEPS TO FOLLOW
- ------                                           ---------------
<S>                                             <C>   
BY MAIL:                                         TO OPEN A NEW ACCOUNT:

     Thompson Plumb Funds, Inc.                  1.   Complete the Account Application.
     c/o Firstar Mutual Fund Services, LLC       2.   Make your check payable to "Thompson Plumb
     P.O. Box 701                                     Funds" (note: your purchase must meet the applicable
     Milwaukee, WI 53201-0701                         minimum).
                                                 3.   Send the completed Account Application and check to
                                                      the applicable address listed to the left (note: $25
                                                      charge for checks returned for insufficient funds).
</TABLE>

                                       23
<PAGE>   24

<TABLE>
<CAPTION>
BY PERSONAL DELIVERY/EXPRESS MAIL:               TO ADD TO AND EXISTING ACCOUNT:
<S>                                             <C>   
      Thompson Plumb Funds, Inc.                 1.   Complete the Additional Investment form
      c/o Firstar Mutual Fund Services, LLC           included with your account statement (or write a note
      615 East Michigan Street                        with your account number).
      Milwaukee, WI 53202                        2.   Make your check payable to "Thompson Plumb
                                                      Funds".
                                                 3.   Send the Additional Investment form (or note) and
                                                      check to the applicable address listed to the left
                                                      (note: $25 charge for checks returned for
                                                      insufficient funds).
<CAPTION>

BY WIRE OR ELECTRONIC FUNDS TRANSFER:            TO OPEN A NEW ACCOUNT:
<S>                                             <C>   
Wire To:     Firstar Bank Milwaukee, N.A.        1.   Complete and return the Account Application
             ABA 075000022                            form to Firstar at the applicable address set forth
                                                      above.
Credit:      c/o Firstar Mutual Fund             2.   Call Firstar at 1-800-499-0079 or (414) 765-4124
               Services, LLC                          before making the wire transfer and provide
             Account 112-952-137                      your name, account number, address, social security
                                                      or tax identification number, the amount being wired,
Further Credit:   (Name of Fund)                      the name of your bank and the name and  phone  number
                  (Account Number)                    of your bank's contact person.
                  (Your Name)                    3.   Instruct your bank (which must be a member
                                                      of, or have a correspondent relationship with a
Note: Amounts sent by wire or electronic              member of, the Federal Reserve System for wire
funds transfers must be received by                   transfers, or must be an Automated Clearing House
Firstar before 3:00 p.m Central Time in               member for electronic funds transfers) to wire the
order to buy shares that day. Also, you               funds as shown to the left (note: $25 charge for
are responsible for any changes that your             insufficient or unavailable funds or your negligence).
bank may impose for effecting the wire or
electronic funds transfer.
                                                                                                              
                                                 TO ADD TO AN EXISTING ACCOUNT:

                                                 1.    Follow steps 2 and 3 above, and make sure you give
                                                       Firstar your correct account number.
</TABLE>


                                       24
<PAGE>   25

<TABLE>
<CAPTION>
AUTOMATIC INVESTMENT PLAN:                                     TO OPEN AN ACCOUNT:
<S>                                                            <C>

(Note: This plan may be suspended,                             Not Applicable.
modified or terminated at any time.)

                                                               TO ADD TO AN EXISTING ACCOUNT:

                                                               1.       Call Firstar at 1-800-499-0079 or (414) 765-4124
                                                                        or call the Funds at 1-800-999-0887 or (608)
                                                                        831-1300 to obtain an Automatic Investment Plan
                                                                        Application.
                                                               2.       Complete the Automatic Investment Plan
                                                                        Application to authorize the transfer of funds
                                                                        from your bank account, include a voided check
                                                                        with the application and indicate how often
                                                                        (monthly, bimonthly, quarter or yearly) you wish
                                                                        to make automatic investments.
                                                               3.       Indicate the amount of the au tomatic
                                                                        investments (must be at least $50 per
                                                                        investment).
                                                               4.       Your bank will deduct the automatic investment
                                                                        amount you have selected from your checking
                                                                        account on the business day of your choosing,
                                                                        and apply that amount to the purchase of fund
                                                                        shares. (Note: you will be charged $25 for any
                                                                        automatic investments that do not clear due to
                                                                        insufficient funds or the closing of your
                                                                        account without notifying the Funds or Firstar.)
</TABLE>

                                       26

<PAGE>   26

 
THROUGH BROKER-DEALERS AND OTHER SERVICE   You may purchase shares of any Fund 
PROVIDERS:                                 through a broker-dealer, institution
                                           or other service provider, who may
                                           charge a commission or other
                                           transaction fee. Certain features of
                                           a Fund may not be available or may be
                                           modified in connection with the
                                           program offered by your service
                                           provider. The service provider,
                                           rather than you, may be the
                                           shareholder of record of Fund shares,
                                           and may be responsible for delivering
                                           Fund reports and other communications
                                           about the Funds to you.

EXCHANGE OF FUND SHARES

         You may exchange shares of a Fund for shares of another Fund without a
fee or sales charge. The exchange of shares can be made by mail by completing an
Exchange Application (available from Firstar or the Funds) or by telephone if
you have so elected on your Account Application. In making telephone exchanges,
you assume the risk for unauthorized transactions. However, we have procedures
designed to reasonably assure that the telephone instructions are genuine and
will be liable to you if you suffer a loss from our failure to abide by these
procedures. The exchange privilege may be modified or terminated at any time.

         The basic rules for exchanges are as follows:

         -     You must own shares of a Fund for at least 15 days before you can
               exchange them for shares of another Fund.

         -     Shares being exchanged must have a net asset value of at least
               $1,000 (except for the Automatic Exchange Plan) but less than
               $100,000.

         -     We reserve the right to limit the number of times you may
               exchange Fund shares.

         Automatic Exchange Plan. You may also make regular monthly exchanges
from one Fund to another through our Automatic Exchange Plan. You may
participate by completing the Automatic Exchange Plan Application, which may be
obtained from the Funds or Firstar. You must establish an account for each Fund
with at least $1,000 before you can make automatic exchanges. You determine the
amount that will automatically exchanged (must be at least $50) and the day of
each month the exchange will be made.

         Tax Treatment for Exchanges. An exchange of shares from one Fund to
another Fund is treated as a sale of the shares being exchanged and any gain on
the transaction may be subject to income tax.


                                       26



<PAGE>   27

AVAILABILITY OF MONEY MARKET FUND

         If you elect on the Account Application, you may withdraw some or all
of your investment in a Fund and reinvest the proceeds the same day in the
Firstar Money Market Fund. You may also move that investment back into any of
the Funds. Your use of his privilege is subject to the purchase and redemption
amounts set forth in the Firstar Money Market Fund prospectus. There is no
charge for this privilege. However, the Funds receive a fee from Firstar Money
Market Fund for certain distribution and support services at the annual rate of
0.20% of the average daily net asset value of the Firstar Money Market Fund
shares that are issued as a result of exchanges of Fund shares. This privilege
may be modified or terminated at any time.


                                       27
<PAGE>   28


                               HOW TO SELL SHARES

GENERAL

         You may redeem (sell back to the Fund) all or some shares of any Fund
at any time by sending a written request to Firstar. A Redemption Request Form
is a available from the Funds or Firstar. The price you receive for the shares
will be based on the net asset value per share next determined after the
redemption request is received in proper form. Please call Thompson Plumb Funds,
Inc. at 1-800-999-0887 or (608) 831-1300 if you have any questions about
redeeming shares of the Funds.

REDEMPTION PROCEDURES

         You may redeem Fund shares in the following ways:

<TABLE>
<CAPTION>
METHOD                                           STEPS TO FOLLOW
- ------                                           ---------------
<S>                                              <C>
BY MAIL:                                         1.       A written request for redemption (or the
                                                          Redemption Request form) must be signed exactly as
      Thompson Plumb Funds, Inc.                          the account is registered and include the account
      c/o Firstar Mutual Fund Services, LLC               number and the amount to be redeemed.
      P.O. Box 701                               2.       Send the written redemption request and any
      Milwaukee, WI 53201-0701                            certificates for the shares being redeemed to the
                                                          applicable address listed to the left.
BY PERSONAL DELIVERY/EXPRESS MAIL:               3.       Signatures may need to be guaranteed. See
                                                          "Signature Guarantees."
      Thompson Plumb Funds, Inc.
      c/o Firstar Mutual Fund Services, LLC
      615 East Michigan Street
      Milwaukee, WI 53202

</TABLE>


                                       28

<PAGE>   29

<TABLE>
<S>                                                           <C>
SYSTEMATIC WITHDRAWAL PLANS:                                   You can elect to participate in our Systematic                 
                                                               Withdrawal Plan by completing the Systematic Withdrawal
                                                               Plan Application which is available from the Funds or
                                                               Firstar. This plan allows you to arrange for automatic
                                                               withdrawals from your Fund account into a
                                                               pre-authorized bank account. You select the schedule
                                                               for systematic withdrawals, which may be on a monthly
                                                               basis or in certain designated months. You also select
                                                               the amount of each systematic withdrawal, subject to a
                                                               $50 minimum. To begin systematic withdrawals, you must
                                                               have a Fund account valued at $10,000 or more. The
                                                               Systematic Withdrawal Plan may be terminated or
                                                               modified at any time.

THROUGH BROKER-DEALERS, INSTITUTIONS AND OTHER SERVICE         You may redeem Fund shares through broker-dealers,
PROVIDERS:                                                     institutions and other service providers, who may
                                                               charge a commission or other transaction fee for
                                                               processing the redemption for you.
</TABLE>

RECEIVING REDEMPTION PROCEEDS

         You may request to receive your redemption proceeds by mail or by wire
or electronic funds transfer. No redemption will be effective until all
necessary documents have been received in proper form by Firstar. Firstar will
delay sending redemption proceeds for 15 days from their purchase date or until
all payments for the shares being redeemed have cleared, whichever occurs first.


                                       29
<PAGE>   30


<TABLE>
<CAPTION>
METHOD                                                       STEPS TO FOLLOW
- ------                                                       ---------------
<S>                                                          <C>    
BY MAIL:                                                     Firstar mails checks for redemption proceeds within seven
                                                             days after it receives the request and all necessary
                                                             documents. The check will be mailed to the address on
                                                             your account (unless you request that it be sent to a
                                                             different address which would require a signature
                                                             guarantee). There is no charge for mailing out redemption
                                                             checks. Your redemption checks will be mailed unless you
                                                             expressly request that it be sent by wire or electronic
                                                             fund transfer.

BY WIRE/ELECTRONIC FUNDS TRANSFER:                           At your written request and with a guaranteed signature
                                                             on your redemption request, Firstar will send you your
                                                             redemption proceeds by wire or electronic funds transfer
                                                             to your designated bank account. Redemption proceeds sent
                                                             by wire transfer ordinarily will be made the business day
                                                             immediately after Firstar receives the request.
                                                             Redemption proceeds by electronic fund transfer will be
                                                             made within two or three days after Firstar receives the
                                                             request. You will be charged a fee (currently $12) for
                                                             each wire transfer. There is no charge for electronic
                                                             fund transfers. You will be responsible for any charges
                                                             that your bank may impose for receiving wire or
                                                             electronic fund transfers.
</TABLE>

OTHER REDEMPTION INFORMATION

         Signature Guarantees. For your protection, your signature on a
redemption request must be guaranteed by an institution eligible to provide them
under federal or state law (such as a bank, savings and loan, or securities
broker-dealer) under any of the following circumstances:

         -     The redemption is for $25,000 or more.

         -     The proceeds are to be sent to someone other than the registered
               account holder of the shares being redeemed.


                                       30


<PAGE>   31

         -     The proceeds are to be sent to an address other than the
               registered address on the account.

         -     If you want to change ownership registration on your account.

         -     If you have requested a change of address within 30 days prior to
               the redemption request.

         -     If you request that the redemption proceeds be sent by wire or
               electronic fund transfer.

         Closing of Small Accounts. Your account in any Fund may be terminated
if, as a result of any transfer, exchange or redemption of shares in the
account, the aggregate net asset value per share of the remaining shares in the
account falls below $750. We will notify you at least 30 days in advance of our
intention to terminate the account to allow you an opportunity to restore the
account balance to at least $750. Upon any such termination, we will send you a
check for the proceeds of redemption.

         Suspension of Redemptions. Your right to redeem shares in any Fund and
the date of payment by the Fund may be suspended when: (1) the New York Stock
Exchange is closed or the Securities and Exchange Commission determines that
trading on the Exchange is restricted; (2) an emergency makes it impracticable
for the Fund to sell its portfolio securities or to determine the fair value of
its net assets; or (3) the Securities and Exchange Commission orders or permits
the suspension for your protection.


                                       31
<PAGE>   32


                                OTHER INFORMATION

DETERMINATION OF NET ASSET VALUE

         Each Fund calculates its share price, also called net asset value, for
purposes of both purchases and sales of shares, as of the close of trading on
the New York Stock Exchange (generally 4:00 p.m., Eastern Time), every day the
Exchange is open. A Fund's net asset value per share is determined by adding up
the total value of the Fund's investments and other assets and subtracting its
liabilities, and then dividing that amount by the number of outstanding shares
of the Fund. Each Fund's investments are valued at their market prices
(generally the last reported sales price on the exchange where the securities
are primarily traded) or, where market quotations are not readily available, at
fair value as determined in good faith by the Advisor pursuant to procedures
established by the Funds' Board of Directors. Debt securities held by a Fund
with remaining maturities of 60 days or less may be valued on a amortized cost
basis.

DIVIDENDS AND DISTRIBUTIONS

         The Growth and Balanced Funds annually (generally within 60 days
following their November 30 fiscal year-end) distribute substantially all of
their net investment income and any net realized capital gains. The Bond Fund
distributes its net investment income quarterly (generally within 60 days
following the end of each fiscal quarter) and net realized capital gains
annually (generally within 60 days following its November 30 fiscal year-end).
All income, dividends and capital gains distributions are automatically
reinvested in shares of the relevant Fund at net asset value, without a sales
charge, on the payment date, unless you request payment in cash.

TAXES

         Dividends and distributions of income and capital gains are generally
taxable when they are paid, whether they are reinvested in additional Fund
shares or received in cash, unless you are exempt from taxation or entitled to
tax deferral. Income dividends are taxable as ordinary income. Capital gains are
taxed at different rates depending on the length of time a Fund holds its
assets. You will receive information annually on the federal tax status of the
Fund's dividends and capital gains distributions.

         We expect that most of the Growth Fund's distributions will be capital
gains, the Balanced Fund's distributions will be a combination of capital gains
and ordinary income, and most of the Bond Fund's distributions will be ordinary
income, in light of their investment objectives and policies.

         In the Account Application you are asked to certify that your taxpayer
identification or social security number is correct and that you are not subject
to backup withholding. If you fail to do so, the Funds are required to withhold
31% of your taxable distributions and redemption proceeds.


                                       32
<PAGE>   33

         The foregoing tax discussion is general. You should consult your own
tax advisor for more information and specific advice.

RETIREMENT PLANS

         The Funds sponsor Individual Retirement Accounts (IRAs) through which
you may invest annual IRA contributions and roll-over IRA contributions in
shares of any of the Funds. The IRAs available through the Funds include
traditional IRAs, Roth IRAs and Education IRAs. Firstar will serve as custodian
for all these types of IRA accounts sponsored by the Funds. Firstar will charge
a $12.50 annual maintenance fee for each Traditional IRA or Roth IRA account and
$5.00 for each Education IRA. Shareholders with two or more IRAs using the same
tax ID number will be charged a total of $25.00 annually. Please refer to the
IRA Disclosure Statement for a detailed listing of other fees. The Individual
Retirement Account Custodial Agreement, the IRA Disclosure Statement and the
Custodial Account Application are available from the Funds.

         Purchases and redemptions of shares of any Fund by IRAs and retirement
plans are treated in the same manner as any other account. IRAs must meet a
minimum initial investment requirement of $250 and a minimum subsequent
investment requirement of $100. Redemption requests on behalf of IRA owners or
retirement plans must indicate whether or not to withhold federal income tax.

         Purchases may also be made by SEP plans (Simplified Employee Benefit
Plan), SIMPLE plans (Savings Incentive Match Plan for Employees of Small
Employers) and other retirement plans. Forms of SEP and SIMPLE plans are
available from the Funds.

         Because a retirement program involves commitments covering future
years, it is important that the investment objectives of the Funds be consistent
with the participant's retirement objectives. Premature withdrawals from a
retirement plan may result in adverse tax consequences. Please consult with your
own tax or financial advisor.

YEAR 2000 COMPLIANCE

         Many currently installed computer systems and software products used by
businesses worldwide will need to be upgraded to accept four digit entries to
distinguish 21st century dates from 20th century dates. Significant uncertainty
exists concerning the potential costs and effectiveness of efforts to achieve
"Year 2000" compliance, and the possible consequences of failure.

         Year 2000 issues potentially could affect the Funds in a number of
ways. For example, the Funds rely on service providers for such critical daily
operations as pricing, custody, selection of portfolio securities, tracking of
purchases and sales of portfolio securities in automated systems, transfer agent
functions, and the like. The Year 2000 problem in an automated system used to
provide these services could disrupt the service or corrupt the integrity of the
information generated and the transaction recorded. Also, trading prices


                                       33

<PAGE>   34

reported by the stock exchanges could be affected by Year 2000 problems in the
systems used by the exchanges for this purpose. Such developments could
materially impair the ability of the Funds to conduct day-to-day operations.

         In addition, issuers whose securities are owned by the Funds face Year
2000 risks. They could experience disruptions or failures of their own internal
automated systems or those of the customers and vendors on which their business
operations rely. These developments could adversely affect the price of an
issuer's securities or the ability of the issuer to make interest and principal
or dividend payments on its securities. If a significant number of issuers of
securities held by a Fund were to experience such difficulties, the value of the
Fund's shares could decline. Rules and regulations of the Securities and
Exchange Commission require issuers to disclose in their public statements and
reports their Year 2000 exposure and steps they have taken to minimize that
exposure. We consider an issuer's Year 2000 readiness in determining whether to
purchase or sell its securities; however, an issuer's Year 2000 readiness is
only one of numerous factors we may consider when making investment decisions
and other factors generally receive greater weight.

         The Funds are assessing their exposure with regard to Year 2000 issues.
The Funds have received assurances that the custodial and transfer agency
services provided by Firstar will not be disrupted or otherwise affected by Year
2000 issues, and that Firstar will not find it necessary to increase fees for
its custodial or transfer agent services solely to recover costs incurred in
order to become Year 2000 compliant. The Advisor has established a committee to
consider how Year 2000 issues will affect its ability to render investment
advisory and accounting services to the Funds. The Advisor is optimistic it will
be able to achieve compliance and provide uninterrupted services to the Funds
across the millennium, although definitive assurance cannot be provided on this
point. The Funds are carefully monitoring the situation, and will receive
periodic updates from the Advisor on its progress. The Funds could be adversely
affected if Year 2000 issues are not addressed and resolved in a timely manner.
Moreover, because of the inherent uncertainty of the scope of the Year 2000
readiness issue worldwide and the various levels of severity and catastrophe
that have been predicted by numerous "experts" and commentators, there can be no
assurance that the Funds will be able to identify all Year 2000 compliance risks
or that the measures being taken to resolve those issues will enable the Funds
to continue to conduct daily operations across the change to the Year 2000 or to
protect the Funds from potential economic losses suffered by issuers as a result
of Year 2000 problems.

                                       34
<PAGE>   35

                              FINANCIAL HIGHLIGHTS

         The financial highlights tables are intended to help you understand the
Funds' financial performance for the past 5 fiscal years (which end on November
30). Certain information reflects financial results for a single Fund share. The
total returns in the tables represent the rate that an investor would have
earned or lost on an investment in the Funds (assuming reinvestment of all
dividends and distributions). This information has been audited by
PricewaterhouseCoopers LLP, whose report, along with the Funds' financial
statements, are included in the Annual Report to Shareholders, which is
available upon request.

                    
<TABLE>
<CAPTION>
                                                                                Year Ended November 30,
                                                                   -------------------------------------------------------
                                                                      1998        1997       1996        1995        1994
                                                                      ----        ----       ----        ----        ----
<S>                                                                <C>        <C>        <C>         <C>        <C>       
GROWTH FUND

PER SHARE DATA:

NET ASSET VALUE, BEGINNING OF PERIOD                               $   39.36  $   32.79  $    24.74  $   20.43  $    20.47
INCOME FROM INVESTMENT OPERATIONS
         Net investment loss                                           (0.07)     (0.12)      (0.06)     (0.05)      (0.20)
         Net realized and unrealized gains on investments               4.92       9.16        8.66       6.22        0.16
                                                                   ---------  ---------  ----------  ---------  ----------
         TOTAL FROM INVESTMENT OPERATIONS                               4.85       9.04        8.60       6.17       (0.04)

LESS DISTRIBUTIONS
         Dividends from net investment income                             --         --          --         --          --
         Distributions from capital gains                              (3.36)     (2.47)      (0.55)     (1.86)         --
                                                                   ---------  ---------  ----------  ---------  ----------
         TOTAL DISTRIBUTIONS                                           (3.36)     (2.47)      (0.55)     (1.86)         --
NET ASSET VALUE, END OF PERIOD                                     $   40.85  $   39.36  $    32.79  $   24.74  $    20.43
                                                                   =========  =========  ==========  =========  ==========

TOTAL RETURN                                                           13.74%     29.90%      35.52%     32.87%      (0.19%)
RATIOS/SUPPLEMENTAL DATA:

         Net assets, end of period (millions)                      $    68.5  $    45.4  $     24.1  $    12.6  $      4.7
         Ratios to average net assets:
            Ratio of expenses                                           1.41%      1.52%       1.58%      2.00%       2.00%
            Ratio of expenses without reimbursement                       --         --          --         --        2.31%
            Ratio of net investment income                             (0.19%)    (0.41%)     (0.27%)    (0.31%)     (0.49%)
            Ratio of net investment income without reimbursement          --         --          --         --       (0.80%)
         Portfolio turnover rate                                       67.13%     77.66%     101.91%     86.68%     116.69%
</TABLE>



                                       35

<PAGE>   36


<TABLE>
<CAPTION>
                                                                            Year Ended November 30,
                                                               --------------------------------------------------  
                                                               1998        1997        1996       1995       1994
                                                               ----        ----        ----       ----       ----
<S>                                                         <C>        <C>        <C>         <C>         <C>       
BALANCED FUND

PER SHARE DATA:

NET ASSET VALUE, BEGINNING OF PERIOD                        $   18.16  $   16.54  $    14.23  $    13.55  $    14.17
INCOME FROM INVESTMENT OPERATIONS
         Net investment income                                   0.19       0.18        0.19        0.24        0.27
         Net realized and unrealized gains on investments        1.65       3.01        3.21        2.26        0.04
                                                            ---------  ---------  ----------  ----------  ----------
         TOTAL FROM INVESTMENT OPERATIONS                        1.84       3.19        3.40        2.50        0.31
LESS DISTRIBUTIONS
         Dividends from net investment income                   (0.13)     (0.23)      (0.23)      (0.28)      (0.27)
         Distributions from capital gains                       (1.71)     (1.34)      (0.86)      (1.54)      (0.66)
                                                            ---------  ---------  ----------  ----------  ----------


         TOTAL DISTRIBUTIONS                                    (1.84)     (1.57)      (1.09)      (1.82)      (0.93)

NET ASSET VALUE, END OF PERIOD                              $   18.16  $   18.16  $    16.54  $    14.23  $    13.55
                                                            =========  =========  ==========  ==========  ==========

TOTAL RETURN                                                    11.63%     21.39%      25.80%      21.02%       2.15%

RATIOS/SUPPLEMENTAL DATA:

         Net assets, end of period (millions)               $   47.3   $   36.3   $    20.8   $    18.1   $    17.2
         Ratios to average net assets:
            Ratio of expenses                                    1.30%      1.40%       1.45%       1.49%       1.42%
            Ratio of net investment income                       1.16%      1.04%       1.32%       1.71%       1.84%
         Portfolio turnover rate                                83.07%     76.66%     134.82%     111.16%     110.01%
</TABLE>

<TABLE>
<CAPTION>
                                                                            Year Ended November 30,
                                                              --------------------------------------------------
                                                              1998        1997        1996       1995       1994
                                                              ----        ----        ----       ----       ----
<S>                                                         <C>        <C>        <C>         <C>         <C>       
BOND FUND

PER SHARE DATA:

NET ASSET VALUE, BEGINNING OF PERIOD                        $   10.54  $   10.59  $    10.67  $     9.88  $    10.78
INCOME FROM INVESTMENT OPERATIONS
         Net investment income                                   0.56       0.54        0.52        0.57        0.48
              Net realized & unrealized gains (losses) on
investments                                                      0.39      (0.06)      (0.07)       0.78       (0.78)
                                                            ---------  ---------  ----------  ----------  ----------
         TOTAL FROM INVESTMENT OPERATIONS                        0.95       0.48        0.45        1.35       (0.30)
LESS DISTRIBUTIONS
         Dividends from net investment income                   (0.56)     (0.53)      (0.53)      (0.56)      (0.47)
         Distributions from capital gains                          --         --          --          --       (0.13)
                                                            ---------  ---------  ----------  ----------  ----------

         TOTAL DISTRIBUTIONS                                    (0.56)     (0.53)      (0.53)      (0.56)      (0.60)

NET ASSET VALUE, END OF PERIOD                              $   10.93  $   10.54  $    10.59  $    10.67  $     9.88
                                                            =========  =========  ==========  ==========  ==========


TOTAL RETURN                                                     9.34%      4.74%       4.51%      14.06%      (2.96%)

RATIOS/SUPPLEMENTAL DATA:

         Net assets, end of period (millions)               $    32.7   $   32.1   $    22.2   $    14.9   $    10.2
         Ratios to average net assets:
            Ratio of expenses                                    1.04%      1.14%       1.13%       1.13%       1.00%
            Ratio of expenses without reimbursement              1.08%        --          --        1.34%       1.48%
            Ratio of net investment income                       5.30%      5.42%       5.48%       5.70%       4.83%
            Ratio of net investment income without
              reimbursement                                      5.26%        --          --        5.49%       4.34%
         Portfolio turnover rate                                35.09%     52.61%     104.43%     111.95%     165.74%
</TABLE>



                                       36

<PAGE>   37

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

       DIRECTORS OF THE FUNDS                        CUSTODIAN
                                           Firstar Bank Milwaukee, N.A.
          George H. Austin                   777 East Wisconsin Avenue
                                            Milwaukee, Wisconsin 53202
          Mary Ann Deibele
                                    TRANSFER AGENT AND DIVIDEND DISBURSING AGENT
            John W. Feldt                Firstar Mutual Fund Services, LLC
                                             615 East Michigan Street
          Donald A. Nichols                 Milwaukee, Wisconsin 53202

Thomas G. Plumb, CFA; Vice President          INDEPENDENT ACCOUNTANTS
 Thompson, Plumb & Associates, Inc.         PricewaterhouseCoopers LLP
                                        650 Third Avenue South, Suite 1300
  John W. Thompson, CFA; President         Minneapolis, Minnesota 55402
 Thompson, Plumb & Associates, Inc.
                                                   LEGAL COUNSEL
        OFFICERS OF THE FUNDS                   Quarles & Brady LLP
                                             411 East Wisconsin Avenue
        John W. Thompson, CFA               Milwaukee, Wisconsin 53202
        Chairman & Secretary
                                                INVESTMENT ADVISOR
        Thomas G. Plumb, CFA            Thompson, Plumb & Associates, Inc.
        President & Treasurer               1200 John Q. Hammons Drive
                                             Madison, Wisconsin 53717
           David B. Duchow                  Telephone:  (608) 831-1300
      Assistant Vice President

        John C. Thompson, CFA
      Assistant Vice President


===============================================================================
ADDITIONAL FUND INFORMATION

The Statement of Additional Information (SAI) contains additional information
about the Thompson Plumb Funds. The SAI is on file with the Securities and
Exchange Commission (SEC) and is legally part of this Prospectus. The Annual and
Semi-Annual Reports to Shareholders also contain information about the Funds,
including financial statements, investment results and portfolio holdings. In
the Annual Report, you will find a discussion of the market conditions and
investment strategies that significantly affected each Fund's performance during
its last fiscal year.

To obtain a free copy of the SAI or the Annual or Semi-Annual Reports, or to ask
questions about the Funds, you can contact Thompson Plumb & Associates at the
telephone number or address shown above. Information and reports about the Funds
(including the SAI) are also available at the SEC's Public Reference Room in
Washington, D.C. or on the SEC's website at http://www.sec.gov. Information on
the operation of the SEC's Public Reference Room may be obtained by calling
1-800-SEC-0330. Copies of such information and reports may be obtained, upon
payment of a duplicating fee, by writing the SEC's Public Reference Section,
Washington, D.C. 20549-6009.

                                                           SEC File No. 811-4946


<PAGE>   38
                                                                     RULE 497(c)

                       STATEMENT OF ADDITIONAL INFORMATION

                                  APRIL 1, 1999

                           THOMPSON PLUMB FUNDS, INC.

                           1200 JOHN Q. HAMMONS DRIVE
                            MADISON, WISCONSIN 53717
                            TELEPHONE: (608) 831-1300
                                       (800) 999-0887


         This Statement of Additional Information ("SAI") contains detailed
information about the Thompson Plumb Growth Fund (the "Growth Fund"), Thompson
Plumb Balanced Fund (the "Balanced Fund") and Thompson Plumb Bond Fund (the
"Bond Fund"). This SAI is not a prospectus and should be read in conjunction
with the Thompson Plumb Funds, Inc. Prospectus (the "Prospectus") dated April 1,
1999. The Prospectus may be obtained by contacting Thompson Plumb Funds, Inc. at
the address or one of the telephone numbers listed above.


                                TABLE OF CONTENTS

                                                                           PAGE
                                                                           ----

FUND HISTORY.................................................................2
DESCRIPTION OF CERTAIN INVESTMENTS AND RISKS.................................2
INVESTMENT RESTRICTIONS......................................................6
DETERMINATION OF NET ASSET VALUE AND PRICING CONSIDERATIONS..................9
MANAGEMENT..................................................................10
ADVISORY, ADMINISTRATIVE AND OTHER SERVICES.................................13
PORTFOLIO TRANSACTIONS AND BROKERAGE........................................15
PERFORMANCE DATA............................................................17
TAXES.......................................................................20
CAPITAL STOCK AND OTHER SECURITIES..........................................22
FINANCIAL STATEMENTS........................................................23


<PAGE>   39


                                  FUND HISTORY

         Thompson Plumb Funds, Inc. (the "Investment Company") is a Wisconsin
corporation incorporated in 1986 and registered an open-end, diversified
management investment company under the Investment Company Act of 1940 (the
"1940 Act"). The Growth Fund, Bond Fund and Balanced Fund are separate series of
the Investment Company. The Growth Fund and Bond Fund each commenced operations
on February 10, 1992. The Balanced Fund commenced operations on March 16, 1987.
Prior to April 3, 1995, the Investment Company was known as Thompson, Unger &
Plumb Funds, Inc.


                  DESCRIPTION OF CERTAIN INVESTMENTS AND RISKS

LENDING PORTFOLIO SECURITIES

         Each Fund may lend its portfolio securities to broker-dealers and
financial institutions, such as banks and trust companies, however, absent
unforeseen market and economic conditions, the Funds have no present intention
to do so. In the event any Fund engages in this activity, Thompson, Plumb &
Associates, Inc. (the "Advisor") will monitor the creditworthiness of firms to
which the Fund lends its securities. Any such loan must be continuously secured
by collateral in cash or cash equivalents maintained on a current basis in an
amount at least equal to the market value of the securities loaned by the Fund.
The Fund would continue to receive the equivalent of the interest or dividends
paid by the issuer on the securities loaned, and would also receive an
additional return which may be in the form of a fixed fee or a percentage of the
collateral. The Fund would have the right to call the loan and obtain the
securities loaned at any time on notice of not more than five business days. The
Fund would not have the right to vote the securities during the existence of the
loan, but would call the loan to permit voting of securities during the
existence of the loan if, in the Advisor's judgment, a material event requiring
a shareholder vote would otherwise occur before the loan was repaid. In the
event of bankruptcy or other default of the borrower, the Fund could experience
both delays in liquidating the loan collateral or recovering the loaned
securities and losses including (a) possible decline in the value of the
collateral or in the value of the securities loaned during the period while the
Fund seeks to enforce its rights thereto, (b) possible subnormal levels of
income and lack of access to income during this period and (c) expenses of
enforcing its rights.

REPURCHASE AGREEMENTS

         Each Fund may from time to time enter into repurchase agreements,
although, absent unforeseen market and economic conditions, no Fund has any
present intention to do so. Repurchase agreements involve the sale of securities
to a Fund with the concurrent agreement of the seller (a bank or securities
dealer) to repurchase the securities at the same price plus an amount equal to
an agreed-upon interest rate within a specified time, usually less than one


                                       2

<PAGE>   40


week, but on occasion for a longer period. The Funds may enter into repurchase
agreements with broker-dealers who are recognized by the Federal Reserve Bank of
New York as primary dealers in U.S. Government securities and with banks. When a
Fund enters into a repurchase agreement, the value of the underlying security,
including accrued interest, will be equal to or exceed the value of the
repurchase agreement and, in the case of repurchase agreements exceeding one
day, the seller will agree that the value of the underlying security, including
accrued interest, will at all times be equal to or exceed the value of the
repurchase agreement. If the seller of the repurchase agreement enters a
bankruptcy or insolvency proceeding, or if the seller fails to repurchase the
underlying security as agreed, a Fund could experience losses that include (a)
possible decline in the value of the underlying security during the period that
the Fund seeks to enforce its rights with respect thereto, and possible delay in
the enforcement of such rights, (b) possible loss of all or a part of the income
or proceeds of the repurchase, (c) additional expenses to the Fund in connection
with enforcing those rights, and (d) possible delay in the disposition of the
underlying security pending court action or possible loss of rights in such
securities. The Advisor intends to cause the Funds to invest in repurchase
agreements only when the Advisor determines that the Funds should invest in
short-term money market instruments and the rates available on repurchase
agreements are favorable as compared to the rates available on other short-term
money market instruments or money market mutual funds, circumstances that the
Advisor does not anticipate will occur in the near future. The Advisor does not
currently intend to invest the assets of any Fund in repurchase agreements if,
after doing so, more than 5% of the Fund's net assets would be invested in
repurchase agreements.

WHEN-ISSUED TRANSACTIONS

         A Fund may purchase or sell portfolio securities in when-issued
transactions, although, absent unforeseen market and economic conditions, the
Funds have no present intention to do so. In such transactions, instruments are
bought or sold with payment and delivery taking place in the future in order to
secure what is considered to be an advantageous yield or price to the Fund at
the time of entering into the transactions. In such transactions, the payment
obligations and the interest rate are fixed at the time the buyer enters into
the commitment, although no interest accrues to the purchaser prior to
settlement of the transaction. Consistent with the requirements of the 1940 Act,
securities purchased on a when-issued basis are recorded as an asset (with the
purchase price being recorded as a liability) and are subject to changes in
value based upon changes in the general level of interest rates. At the time of
delivery of the security, the value may be more or less than the transaction
price. To the extent that a Fund remains substantially fully invested at the
same time that it has entered into such transactions, which all of the Funds
would normally expect to do, there will be greater fluctuations in the market
value of the Fund's assets than if the Fund set aside cash to satisfy the
purchase commitment. However, each Fund will maintain designated liquid assets
with a market value, determined daily, at least equal to the amount of
commitments for when-issued securities, such assets to be ear-marked
specifically for the settlement of such commitments. Each Fund will only make
commitments to purchase portfolio securities on a


                                       3

<PAGE>   41


when-issued basis with the intention of actually acquiring the securities, and
not for the purpose of investment leverage, but the Funds reserve the right to
sell the securities before the settlement date if it is deemed advisable. None
of the Funds currently intends to purchase securities in when-issued
transactions if, after such purchase, more than 5% of the Fund's net assets
would consist of when-issued securities.

ILLIQUID SECURITIES

         No Fund will invest more than 10% of the value of its net assets in
securities which are illiquid, including restricted securities, securities for
which there are no readily available market quotations and repurchase agreements
providing for settlement in more than seven days after notice. For the purposes
of this restriction, the Funds do not consider variable rate demand notes to be
restricted securities. See "Variable Rate Demand Notes" below.

VARIABLE RATE DEMAND NOTES

         The Funds may purchase variable rate master demand notes, which are
unsecured instruments that permit the indebtedness thereunder to vary and
provide for periodic adjustments in the interest rate. Although the notes are
not normally traded and there may be no secondary market in the notes, the Funds
may demand payment of principal and accrued interest at any time. The investment
policy of each Fund is to purchase variable rate demand notes only if, at the
time of purchase, the issuer has unsecured debt securities outstanding that are
rated within the two highest rating categories by either Standard & Poor's or
Moody's Investors Service, Inc.

MORTGAGE-BACKED SECURITIES

         The Balanced and Bond Funds may invest in mortgage-related securities,
which include securities that represent interests in pools of mortgage loans
made by lenders such as savings and loan institutions, mortgage bankers,
commercial banks and others. These pools are combined for sale to investors
(such as the Balanced and Bond Funds) by various governmental and
government-related entities, as well as commercial banks, savings and loan
institutions, private mortgage insurance companies, mortgage bankers and other
private issuers. Mortgage-related securities generally provide for a
"pass-through" of monthly payments made by individual borrowers on their
residential mortgage loans, net of any fees paid to the issuer or guarantor of
the securities.

         The Government National Mortgage Association ("GNMA") is the principal
government guarantor of mortgage-related securities. GNMA is authorized to
guaranty, with the full faith and credit of the U.S. Government, timely payment
of principal and interest on securities it approves that are backed by pools of
FHA-insured or VA-guaranteed mortgages. GNMA securities are described as
"modified pass-through" in that they provide a monthly payment of interest and
principal payments owed on the mortgage pool, net of certain fees, regardless


                                       4

<PAGE>   42


of whether the mortgagor actually makes the payment. Other government related
guarantors of these securities include the Federal National Mortgage Association
("FNMA") and the Federal Home Loan Mortgage Corporation ("FHLMC"). FNMA and
FHLMC securities are guaranteed as to payment of principal and interest by those
agencies, but are not backed by the full faith and credit of the U.S.
Government. With respect to private mortgage-backed securities, timely payment
of principal and interest of these pools is supported by various forms of
insurance or guarantees, including individual loan, title, pool and hazard
insurance. There can be no assurance that private insurers or guarantors can
meet their obligations under such policies.

         Certain mortgage-backed securities purchased by the Balanced and Bond
Funds provide for a prepayment privilege and for amortized payments of both
interest and principal over the term of the security. The yield on the original
investment in such securities applies only to the unpaid principal balance, as
the Fund must reinvest the periodic payments of principal at prevailing market
interest rates which may be higher or lower then the rate on the original
security. In addition, the prepayment privilege may require the Fund to reinvest
at lower yields than were received from the original investment. If these
instruments are purchased at a premium in the market, and if prepayment occurs,
such prepayments will be at par or stated value, which will result in reduced
return on such transactions.

         During periods of declining interest rates, prepayment of mortgages
from underlying mortgage-backed securities can be expected to accelerate.
Accordingly, the Balanced and Bond Fund's ability to maintain positions in
high-yielding mortgage-backed securities will be affected by reductions in the
principal amount of such securities resulting from such prepayments, and its
ability to reinvest the returns of principal at comparable yields will depend on
prevailing interest rates at that time. Neither the Balanced Fund nor the Bond
Fund currently intends to purchase mortgage-backed securities if, after such
purchase, more than 5% of the respective Fund's net assets would consist of
mortgage-backed securities.

INVESTMENTS IN OTHER INVESTMENT COMPANIES

         An investment by a Fund in another investment company may cause the
Fund to increase payments of administration and distribution expenses. Such
investments are limited by investment restriction (7). See "Investment
Restrictions" in this Statement of Additional Information.







                                       5

<PAGE>   43


PORTFOLIO TURNOVER

         The portfolio turnover rates for the fiscal years ended November 30,
1997 and 1998 were as follows:

<TABLE>
<CAPTION>

                                                1997                     1998
                                                ----                     ----
<S>                                            <C>                      <C>   
Thompson Plumb Growth Fund                     77.66%                   67.13%

Thompson Plumb Balance Fund                    76.66%                   83.07%

Thompson Plumb Bond Fund                       52.61%                   35.09%
</TABLE>


                             INVESTMENT RESTRICTIONS

         Each Fund has adopted the following investment restrictions, none of
which - except for the matters described in the second sentence of item (5) and
in the second sentence of item (7) - may be changed without the approval of the
holders of a majority of the outstanding shares (as defined in the 1940 Act) of
the Fund. A Fund may not:

                  (1) Purchase the securities of issuers conducting their
principal business activity in the same industry if immediately after such
purchase the value of the Fund's investments in such industry would exceed 25%
of the value of its total assets, provided that there is no limitation with
respect to or arising out of investments in obligations issued or guaranteed by
the U.S. Government, its agencies or instrumentalities.

                  (2) Purchase a security if, as a result, with respect to 75%
of the value of the Fund's total assets, more than 5% of its total assets would
be invested in the securities of any one issuer, other than obligations issued
or guaranteed by the U.S. Government, its agencies or instrumentalities.

                  (3) Make loans, except through the purchase of debt
obligations in accordance with the Fund's investment objective and policies and
through repurchase agreements with banks, brokers, dealers and other financial
institutions.

                  (4) Issue senior securities in violation of the 1940 Act or
borrow money, except (a) as a temporary measure, and then only in amounts not
exceeding 5% of the value of the Fund's total assets or (b) from banks, provided
that immediately after any such borrowing all borrowings of the Fund do not
exceed one-third of the Fund's net assets. The exceptions to this restriction
are not for investment leverage purposes but are solely for extraordinary or
emergency purposes and to facilitate management of each Fund's portfolio by
enabling the Fund to meet redemption requests when the liquidation of portfolio


                                       6

<PAGE>   44


instruments is deemed to be disadvantageous or not possible. While a Fund has
borrowings in excess of 5% of the value of the Fund's total assets outstanding,
it will not make any purchases of portfolio instruments. If due to market
fluctuations or other reasons the net assets of a Fund fall below 300% of its
borrowings, the Fund will promptly reduce its borrowings in accordance with the
1940 Act. To do this, the Fund may have to sell a portion of its investments at
a time when it may be disadvantageous to do so.

                  (5) Mortgage or pledge any assets except to secure permitted
borrowings, and then only in an amount up to 15% of the value of the Fund's net
assets, taken at cost at the time of such borrowings. Notwithstanding the prior
sentence, each Fund's current intention is not to mortgage, pledge or
hypothecate more than 5% of the value of the Fund's net assets.

                  (6) Purchase or sell real estate or commodities, except that a
Fund may purchase and sell (a) securities issued by real estate investment
trusts or other companies which invest in or own real estate, and (b) securities
secured by interests in real estate, provided in each case that such securities
are marketable.

                  (7) Purchase securities of other investment companies, except
to the extent permitted by the 1940 Act. Subject to certain exceptions, the 1940
Act prohibits a Fund from investing more than 5% of its total assets in
securities of another investment company, investing more than 10% of its total
assets in securities of such investment company and all other investment
companies, or purchasing more than 3% of the total outstanding voting stock of
another investment company.

                  (8) Purchase more than 10% of the outstanding voting
securities of any one issuer or invest in companies for the purpose of
exercising control or management.

                  (9) Act as an underwriter of securities issued by others,
except in instances where the Fund has acquired portfolio securities which it
may not be free to sell publicly without registration under the Securities Act
of 1933 (if the Fund sells such securities, it may technically be deemed an
"underwriter" for purposes of such Act).

         In addition to the foregoing restrictions, the Investment Company's
Board of Directors has adopted the following restrictions, which may be changed
without shareholder approval. A Fund may not:

                  (a) Purchase the equity securities of companies which have a
record of less than three years continuous operation if any such purchase at the
time thereof would cause more than 5% of the value of the total assets of the
Fund to be invested in securities of such companies. Such period of three years
includes the operation of any predecessor company or companies, partnership or
individual enterprise if the company whose securities are proposed as an
investment has come into existence as the result of a merger, consolidation,


                                       7

<PAGE>   45


reorganization or the purchase of substantially all of the assets of such
predecessor company or companies, partnership or individual enterprise.

                  (b) Purchase or retain the securities of an issuer if, to the
Fund's knowledge, those officers or directors of the Fund or its investment
adviser who individually own beneficially more than 0.5 of 1% of the outstanding
securities of such issuer together own beneficially more than 5% of such
outstanding securities.

                  (c) Purchase securities on margin, but a Fund may obtain such
short-term credits as may be necessary for the clearance of purchase and sales
of securities.

                  (d) Make short sales of securities.

                  (e) Participate on a joint or joint-and-several basis in any
securities trading account.

                  (f) Invest in puts, calls, straddles or spreads, or
combinations thereof.

                  (g) Invest more than 10% of its net assets in illiquid
securities.

                  (h) Invest in oil, gas or other mineral exploration or
development programs, but this shall not prohibit a Fund from investing in
securities of companies engaged in oil, gas or mineral activities.

                  (i) Invest in warrants, valued at the lower of cost or market,
in an amount in excess of 5% of the value of the Fund's net assets. Included
within such amount, but not to exceed 2% of the value of the Fund's net assets,
may be warrants which are not listed on the New York or American Stock Exchange.
Warrants acquired by a Fund in units or attached to securities may be deemed to
be without value for purposes of this restriction.

                  (j) Buy or sell real estate or invest in the securities of
real estate investment trusts or real estate limited partnerships, provided the
Funds may invest in the securities of other companies whose business involves
the purchase and sale of real estate.

         For purposes of the foregoing limitations - except for the limitation
referred to in the fourth sentence of item (4) above - any limitation which
involves a maximum percentage shall not be considered violated unless an excess
over the percentage occurs immediately after, and is caused by, an acquisition
or encumbrance of securities or assets of, or borrowings by, a Fund.







                                       8

<PAGE>   46


           DETERMINATION OF NET ASSET VALUE AND PRICING CONSIDERATIONS

         Shares of the Funds are offered to the public directly by the
Investment Company. Fund shares are offered and sold without a sales charge at
the net asset value per share next determined after the purchase order has been
received by the Fund's transfer agent. The net asset value per share of each
Fund is calculated as of the close of trading on the New York Stock Exchange
(generally 4:00 P.M. Eastern Time). Net asset value per share is calculated by
adding the total value of all securities and other assets of the particular
Fund, subtracting the liabilities of the Fund, and dividing the remainder by the
number of outstanding shares of the Fund.

         The Funds' net asset value is determined only on the days on which the
New York Stock Exchange is open for trading. That Exchange is regularly closed
on Saturdays and Sundays and on New Years' Day, Martin Luther King, Jr. Day,
Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving Day and Christmas Day. If one of those holidays falls on a Saturday
or Sunday, the Exchange will be closed on the preceding Friday or the following
Monday, respectively.

         Portfolio securities which are traded on an exchange or in the
over-the-counter market are valued at the last sale price reported by the
exchange on which the securities are primarily traded on the day of valuation.
Securities for which there are no transactions on a given day or securities not
traded on an exchange or in the over-the-counter market are valued at the
average of the most recent bid and asked prices. Debt securities for which
market quotations are not readily available may be valued based on information
supplied by independent pricing services, including services using matrix
pricing formulas and/or independent broker bid quotations. Debt securities with
remaining maturities of 60 days or less may be valued on an amortized cost
basis, which involves valuing an instrument at its cost and thereafter assuming
a constant amortization to maturity of any discount or premium, regardless of
the impact of fluctuating rates on the market value of the instrument. Any
securities or other assets for which market quotations are not readily available
are valued at fair value as determined in good faith by the Advisor pursuant to
procedures established under the general supervision and responsibility of the
Board of Directors of the Investment Company. Expenses and fees, including
advisory fees, are accrued daily and taken into account for the purpose of
determining net asset value per share.

         Reliable market quotations are not considered to be readily available
for many long-term corporate bonds and notes and certain preferred stocks in
which the Funds may invest. As authorized by the Board of Directors, these
investments are stated at fair value on the basis of valuations furnished by
independent broker bid quotations and/or independent pricing services.
Independent pricing services approved by the Board of Directors determine
valuations for normal, institutional-sized trading units of such securities
using methods based on market transactions for comparable securities and various
relationships between securities which are generally recognized by institutional
traders.



                                       9

<PAGE>   47

         The Funds intend to pay all redemptions in cash. Redemption proceeds
ordinarily will be sent within seven days after receipt of the redemption
request and all necessary documents. Each Fund reserves the right to suspend or
postpone redemptions during any period when: (a) trading on the New York Stock
Exchange is restricted, as determined by the Securities and Exchange Commission
or that Exchange is closed for other than customary weekend and holiday closing;
(b) the Securities and Exchange Commission has by order permitted such
suspension; or (c) an emergency, as determined by the Securities and Exchange
Commission, exists, making disposal of portfolio securities or valuation of net
assets of the Funds not reasonably practicable.


                                   MANAGEMENT

         The business and affairs of the Funds are managed by the Board of
Directors of the Investment Company.

         Information pertaining to the directors and officers of the Investment
Company is set forth below. Unless indicated, the address of each director and
officer is 1200 John Q. Hammons Drive, Madison, Wisconsin 53717. An asterisk (*)
indicates those directors who are "interested persons" of the Investment Company
for purposes of the 1940 Act are so indicated by an asterisk (*).

<TABLE>
<CAPTION>

                                          POSITION(S) HELD WITH                      PRINCIPAL OCCUPATION(S)
NAME, AGE AND ADDRESS                     THOMPSON PLUMB FUNDS, INC.                 DURING PAST FIVE YEARS
- ---------------------                     --------------------------                 ----------------------
<S>                                       <C>                                <C>
George H. Austin, 68*                     Director                           Director  of  Research  and   Portfolio
                                                                             Manager  of  the  Advisor  since  March
                                                                             1994;   prior   thereto,   Director  of
                                                                             Investments  of  the  Wisconsin  Alumni
                                                                             Research Foundation from 1976 to 1994.

Mary Ann Deibele, 63                      Director                           Retired  since  September  1994;  prior
20029 Reichardt Road                                                         thereto,  Director  and  member  of the
Kiel, Wisconsin 53042                                                        executive    committee   of   Household
                                                                             Utilities,  Inc.  (a  high  tech  sheet
                                                                             metal fabricating facility).
</TABLE>













                                       10

<PAGE>   48



<TABLE>
<CAPTION>

                                          POSITION(S) HELD WITH                      PRINCIPAL OCCUPATION(S)
NAME, AGE AND ADDRESS                     THOMPSON PLUMB FUNDS, INC.                 DURING PAST FIVE YEARS
- ---------------------                     --------------------------                 ----------------------
<S>                                       <C>                                <C>
David B. Duchow, 31                       Assistant Vice President           Portfolio   Manager   of  the   Advisor
                                                                             since    December    1996;    formerly,
                                                                             Associate   Portfolio  Manager  of  the
                                                                             Advisor  from  January 1994 to December
                                                                             1996;  Investment Analyst and Marketing
                                                                             Manager of the Advisor since  September
                                                                             1992; Marketing  Representative for the
                                                                             Prudential  Co. from  December  1991 to
                                                                             September 1992.

John W. Feldt, 56                         Director                           Senior  Vice  President  of  Finance of
150 East Gilman Street                                                       the University of Wisconsin  Foundation
Madison, Wisconsin 53703                                                     since   1984;   prior   thereto,   Vice
                                                                             President    of    Finance    for   the
                                                                             University of Wisconsin Foundation.

Donald A. Nichols, 58                     Director                           Professor    of    Economics   at   the
1180 Observatory Drive                                                       University  of  Wisconsin  since  1966;
Madison, Wisconsin 53706                                                     Chairman,  Department of Economics from
                                                                             1983 to 1986 and from 1988 to 1990;
                                                                             Director of the Center for Research on
                                                                             the Wisconsin economy; Member of the
                                                                             Board of Advisors of the American
                                                                             Players Theatre since 1993; Economic
                                                                             Adviser to the Governor of the State of
                                                                             Wisconsin from 1982 through 1986;
                                                                             Consultant to National Economic Research
                                                                             Associates during 1985.

Thomas G. Plumb, 46*                      President, Treasurer and           Vice  President  of the  Advisor  since
                                          Director                           co-founding it in June 1984;  formerly,
                                                                             Vice    President   of   Firstar   Bank
                                                                             Madison,  N.A.,  Investment  Management
                                                                             Division,  from  December  1983 to June
                                                                             1984  and  various  officer  and  other
                                                                             management  responsibilities at Firstar
                                                                             Bank  Madison,  N.A. from November 1979
                                                                             to   December    1983;    a   Chartered
                                                                             Financial Analyst.


</TABLE>










                                       11

<PAGE>   49


<TABLE>
<CAPTION>

                                          POSITION(S) HELD WITH                      PRINCIPAL OCCUPATION(S)
NAME, AGE AND ADDRESS                     THOMPSON PLUMB FUNDS, INC.                 DURING PAST FIVE YEARS
- ---------------------                     --------------------------                 ----------------------
<S>                                       <C>                                <C>
John C. Thompson, 30                      Assistant Vice President           Portfolio  Manager of the Advisor since
                                                                             December  1996;   Associate   Portfolio
                                                                             Manager  of the  Advisor  from  January
                                                                             1994  to  December   1996;   Investment
                                                                             Analyst  for the  Advisor  since  March
                                                                             1993; a Chartered Financial Analyst.

John W. Thompson, 55*                     Chairman, Secretary and Director   President   of   the   Advisor    since
                                                                             co-founding it in June 1984;  Treasurer
                                                                             of  the  Advisor  since  October  1993;
                                                                             formerly,   First  Vice  President  and
                                                                             Division   Manager  of  the  Investment
                                                                             Management  Division  of  Firstar  Bank
                                                                             Madison,   N.A.  from   September  1979
                                                                             until June 1984; a Chartered  Financial
                                                                             Analyst.
</TABLE>


         Directors and officers of the Investment Company who are officers,
directors, employees or shareholders of the Advisor do not receive any
remuneration from the Funds for serving as directors or officers. Those
directors who are not so affiliated with the Advisor received $9,800 in fiscal
year 1998, as set forth in the table below.

<TABLE>
<CAPTION>

                                                                                                   TOTAL COM-   
                                AGGREGATE                                ESTIMATED               PENSATION FROM 
                              COMPENSATION       PENSION OR                ANNUAL                  INVESTMENT   
                             FROM INVESTMENT     RETIREMENT            BENEFITS UPON               COMPANY AND  
DIRECTOR                         COMPANY          BENEFITS               RETIREMENT                FUND COMPLEX 
- --------                         -------          --------               ----------                ------------ 
<S>                              <C>                <C>                     <C>                       <C>
Mary Ann Deibele                 $9,800             None                    None                      $9,800

John W. Feldt                    $9,800             None                    None                      $9,800

Donald A. Nichols                $9,800             None                    None                      $9,800
</TABLE>



         For fiscal year 1999, those directors who are not so affiliated with
the Advisor will each receive $11,000.

         As of December 31, 1998, the Investment Company's Directors and
officers as a group owned 52,742 shares (2.87% of the outstanding shares) of the
Growth Fund, 83,239 shares (2.95% of the outstanding shares) of the Balanced
Fund and 21,503 shares (0.81% of the outstanding shares) of the Bond Fund.



                                       12

<PAGE>   50


                   ADVISORY, ADMINISTRATIVE AND OTHER SERVICES

         Thompson, Plumb & Associates, Inc. acts as the investment advisor and
administrator for each of the Funds. John W. Thompson and Thomas G. Plumb each
own 50% of the outstanding shares of the Advisor. The Advisor manages the
investment and reinvestment of the Fund's provides the Funds with personnel,
facilities and administrative services, and supervises the Fund's daily affairs,
all subject to the supervision of the Board of Directors of the Investment
Company. The Advisor formulates and implements a continuous investment program
for each Fund consistent with its investment objective, policy and restrictions.

         The administrative obligations of the Advisor include: (a) providing
supervision of all aspects of each Fund's non-investment operations, such as
custody of the Fund's assets, shareholder servicing and legal and audit services
(the parties giving due recognition to the fact that certain of such operations
are performed by others pursuant to the Funds' agreements with their custodian
and shareholder servicing agent), (b) providing each Fund, to the extent not
provided pursuant to such agreements or the agreement with the Funds' accounting
services agent, with personnel to perform such executive, administrative and
clerical services as are reasonably necessary to provide effective
administration of the Fund, such as preparing budgets, supplying information for
the Prospectus, this Statement of Additional Information and various reports,
and handling meetings of shareholders, (c) arranging, to the extent not provided
pursuant to such agreements, for the preparation of each Fund's tax returns,
reports to shareholders, periodic updating of the Prospectus and this Statement
of Additional Information, and reports filed with the SEC and other regulatory
authorities, all at the expense of the Fund, (d) providing each Fund, to the
extent not provided pursuant to such agreements, with adequate office space and
certain related office equipment and services in Madison, Wisconsin, and (e)
maintaining all of the records of each Fund other than those maintained pursuant
to such agreements.

         For the fiscal years ended November 30, 1998, 1997 and 1996, in return
for serving as the Funds' investment advisor and administrator, the Advisor
earned fees of $581,250, $333,296 and $171,264, respectively, for the Growth
Fund; $357,956, $247,662 and $163,437, respectively, for the Balanced Fund; and
$206,183 $183,746 and $115,203, respectively, for the Bond Fund.

         The Advisory Agreement provides that the Advisor may render similar
services to others so long as its services under the Agreement are not impaired
thereby. The Advisory Agreement also provides that the Funds will indemnify the
Advisor against certain liabilities, including liabilities under the federal
securities laws, or, in lieu thereof, contribute to resulting losses. The
Advisory Agreement further provides that, subject to Section 36 of the 1940 Act,
the Advisor will not be liable for any error of judgment or mistake of law or
for any loss suffered by the Funds in connection with the matters to which the
Agreement relates, except liability to a Fund or its shareholders to which the
Advisor would otherwise be subject by


                                       13

<PAGE>   51


reason of willful misfeasance, bad faith, or gross negligence, in the
performance of its duties, or by reason of its reckless disregard of its
obligations and duties under the Agreement.

         The Advisory Agreement between the Advisor and the Funds was approved
pursuant to the vote of a majority of the outstanding shares (as defined in the
1940 Act) of the Balanced Fund on March 9, 1988 and of the Bond and Growth Funds
on December 22, 1992. The Advisory Agreement will continue from year to year
with respect to each Fund provided such continuance is specifically approved at
least annually, (a) by the vote of the outstanding shares of the Fund or by the
Directors of the Funds, and (b) by the vote of a majority of the Directors of
the Funds who are not parties to the Advisory Agreement or "interested persons"
(as such term is defined in the 1940 Act) of any party thereto, cast in person
at a meeting called for the purpose of voting on such approval. The Advisory
Agreement will terminate automatically if assigned (as defined in the 1940 Act)
and is terminable at any time without penalty by the Directors of the Funds or,
with respect to any Fund, by vote of a majority of the outstanding shares of the
Fund (as defined in the 1940 Act) on 60 days' written notice to the Advisor and
by the Advisor on 60 days' written notice to the Funds.

ACCOUNTING SERVICES AGENT

         Under its Accounting Services Agreement with the Funds, the Advisor
maintains and keeps current certain accounts and financial records of each Fund,
prepares the financial statements of each Fund as required by the 1940 Act and
calculates the net asset value per share of each Fund on a daily basis.

         For the fiscal years ended November 30, November 30, 1998, 1997 and
1996, the Advisor earned fees for the services it provided to, and the expenses
it assumed for, the Funds under the Accounting Services Agreement in the amounts
of $96,358, $63,099 and $34,990, respectively, for the Growth Fund; $75,141,
$56,797 and $38,456, respectively, for the Balanced Fund; and $62,104, $56,007
and $35,457, respectively, for the Bond Fund.

EXPENSES

         The Funds are responsible for the payment of their own expenses. Such
expenses include, without limitation: the fees payable to the Advisor; the fees
and expenses of the Funds' custodian and transfer and dividend disbursing agent;
the cost of stock certificates; association membership dues; any portfolio
losses; filing fees for the registration or qualification of Fund shares under
federal or state securities laws; expenses of the organization of the Funds;
taxes; interest; costs of liability insurance, fidelity bonds, indemnification
or contribution; any costs, expenses or losses arising out of any liability of,
or claim for damages or other relief asserted against, the Funds for violation
of any law; legal and auditing fees and expenses; expenses of preparing and
setting in type prospectuses, statements of additional information, proxy
material, reports and notices and the printing and distributing of the same to
the Funds' existing shareholders and regulatory authorities; compensation and
expenses of


                                       14

<PAGE>   52


the Funds' Directors; and extraordinary expenses incurred by the Funds. The
Advisor will bear the expense of printing and distributing prospectuses to
prospective shareholders.

         The Advisor has agreed to reimburse each of the Growth, Balanced and
Bond Funds for all expenses such Fund incurs from April 1, 1999 through March
31, 2000 in excess of 1.30%, 1.25% and 0.95%, respectively, of its average daily
net assets.

TRANSFER AND DIVIDEND DISBURSING AGENT

         Firstar Mutual Fund Services, LLC, 615 East Michigan Street, Third
Floor, P.O. Box 701, Milwaukee, Wisconsin 53201, is the transfer and dividend
disbursing agent for the Funds.

CUSTODIAN

         Firstar Bank Milwaukee, N.A., 777 East Wisconsin Avenue, Milwaukee,
Wisconsin 53202, is the custodian of the Funds' portfolio securities and cash.

COUNSEL AND INDEPENDENT ACCOUNTANTS

         Quarles & Brady LLP, 411 East Wisconsin Avenue, Milwaukee, Wisconsin
53202, serves as general counsel to the Funds.

         PricewaterhouseCoopers LLP, independent accountants, 650 Third Avenue
South, Suite 1300, Minneapolis, Minnesota 55402, serves as independent
accountants for the Funds.


                      PORTFOLIO TRANSACTIONS AND BROKERAGE

         The Advisor is responsible for decisions to buy and sell securities for
each Fund, the selection of brokers and dealers to effect the transactions and
the negotiation of brokerage commissions, where applicable. Purchases and sales
of securities on a national securities exchange are effected through brokers who
charge a negotiated commission for their services. In the over-the-counter
market, securities are generally traded on a "net" basis with dealers acting as
principal for their own accounts without a stated commission, although the price
of the security usually includes a profit to the dealer. In underwritten
offerings, securities are purchased at a fixed price which includes an amount of
compensation to the underwriter, generally referred to as the underwriter's
concession or discount. On occasion, certain money market instruments may be
purchased directly from an issuer, in which case no commissions or discounts are
paid.

         In placing purchase and sale orders for portfolio securities for the
Fund, it is the policy of the Advisor to seek the best net price and the most
favorable execution in light of the overall quality of brokerage and research
services provided. In addition, the Advisor may


                                       15

<PAGE>   53


place orders for portfolio transactions with brokers who recommend the purchase
of shares of the Funds to clients if the Advisor believes that such brokers'
commissions or dealer spreads, quality of execution and the overall quality of
brokerage and research services are comparable to those of other brokers. In
selecting brokers to effect portfolio transactions, the determination of what is
expected to result in best net price and the most favorable execution involves a
number of largely judgmental considerations. Among these are the Advisor's
evaluation of the broker's efficiency in executing and clearing transactions and
the broker's financial strength and stability. The best net price takes into
account the brokerage commission or dealer spread involved in purchasing the
securities. Transactions in the securities of small companies may involve
specialized services on the part of the broker and thereby entail higher
commissions or spreads than would be paid in transactions involving more widely
traded securities.

         In selecting brokers to effect portfolio transactions for the Funds,
the Advisor also takes into consideration the research, analytical, statistical
and other information and services provided by the broker, such as general
economic reports and information, reports or analyses of particular companies or
industry groups, market timing and technical information, access to computerized
data bases and the software for analyzing such data bases, and the availability
of the brokerage firm's analysts for consultation. Where computer software
serves other functions than assisting the Advisor in the investment
decision-making process (e.g., recordkeeping), the Advisor makes a reasonable
allocation of the cost of the software to such other functions and bears such
part of the cost itself. While the Advisor believes such information and
services have substantial value, the Advisor considers them supplemental to its
own efforts in the performance of its duties under the Advisory Agreement. Other
clients of the Advisor may benefit from the availability of these services to
the Advisor, and the Funds may benefit from services available to the Advisor as
a result of transactions for other clients. The Advisory Agreement provides that
the Advisor, in placing orders for portfolio securities, is entitled to rely
upon Section 28(e) of the Securities Exchange Act of 1934. Such section
generally permits the Advisor to cause the Funds to pay a broker or dealer, who
provides brokerage and research services to the Advisor, an amount of commission
for effecting a securities transaction in excess of the amount another broker or
dealer would have charged for effecting the transaction; provided the Advisor
determines in good faith that such amount of commission is reasonable in
relation to the value of brokerage and research services provided by the
executing broker or dealer viewed in terms of either the particular transaction
or the Advisor's overall responsibilities with respect to the Funds and the
other accounts as to which the Advisor exercises investment discretion.

         On occasions when the Advisor deems the purchase or sale of a security
to be in the best interest of a Fund as well as the Advisor's other customers
(including any other fund or other investment company or advisory account for
which the Advisor acts as investment advisor), the Advisory Agreement provides
that the Advisor, to the extent permitted by applicable laws and regulations,
may aggregate the securities to be sold or purchased for the Fund with those to
be sold or purchased for such other customers in order to obtain the best


                                       16

<PAGE>   54


net price and most favorable execution. In such event, allocation of the
securities so purchased or sold, as well as the expenses incurred in the
transaction, will be made by the Advisor in the manner it considers to be most
equitable and consistent with its fiduciary obligations to the Fund and such
other customers. In some instances, this procedure may adversely affect the size
of the position obtainable for a Fund.

         During the fiscal year ended November 30, 1998, the Growth Fund,
Balanced Fund and Bond Fund paid brokerage commissions aggregating $92,684,
$69,684 and $2,813, respectively, in connection with their portfolio
transactions. The entire amount of such commissions was paid to brokers or
dealers who provided research services to the Advisor in transactions amounting
to $59,120,016, $42,933,107 and $7,144,188, respectively, other than brokerage
commissions of $1,726 paid to brokers or dealers by the Growth Fund for
executing transactions totaling $1,561,516.

         During the fiscal years ended November 30, 1997 and 1996, the Funds
paid brokerage commissions in connection with their portfolio transactions
aggregating $75,213 and $58,839, respectively, for the Growth Fund; $56,729 and
$52,603, respectively, for the Balanced Fund; and $7,906 and $6,647,
respectively, for the Bond Fund.


                                PERFORMANCE DATA

GENERAL

         From time to time the Funds may advertise yield and total return for
various periods of investment. Such information will always include uniform
performance calculations based on standardized methods established by the
Securities and Exchange Commission, and may also include other total return
information. Yield is based on historical earnings and total return is based on
historical calculated earnings; neither is intended to indicate future
performance. Performance information should be considered in light of the
particular Fund's investment objectives and policies, characteristics and
quality of its portfolio securities in the market conditions during the
applicable period, and should not be considered as a representation of what may
be achieved in the future. Investors should consider these factors, in addition
to differences in the methods used in calculating performance information, when
comparing a particular Fund's performance to the performance data established
for alternative investments.

AVERAGE ANNUAL TOTAL RETURN

         For each of the Funds, standardized annual total return is computed by
finding the average annual compounded rates of return over the one, five and
ten-year periods (or the portion thereof during which the Fund has been in
existence) that would equate the initial amount invested to the ending
redeemable value according to the following formula:


                                       17

<PAGE>   55



WHERE:

         T        =        average annual total return;
         n        =        number of years and portion of a year;
         ERV      =        ending redeemable value (of the hypothetical $1,000
                           payment) at the end of the 1, 5 and 10-year periods,
                           or fractional portion thereof, after deduction of all
                           non-recurring charges to be deducted, assuming
                           redemption at the end of the period; and
         P        =        $1,000 (the hypothetical initial payment).

         The average annual total returns for the Balanced Fund for the
one-year, five-year and ten-year periods ended November 30, 1998, and the
average annual total returns for the Bond and Growth Funds for the one-year and
five-year periods ended November 30, 1998 and for the period from February 10,
1992 (commencement of operations) through November 30, 1998, are as follows:

<TABLE>
<CAPTION>

                                                                                                      FROM
                                                                                                  COMMENCEMENT
                                                                                                       OF
                              1 YEAR               5 YEARS                  10 YEARS               OPERATIONS
                              ------               -------                  --------               ----------
<S>                           <C>                  <C>                       <C>                    <C>
Growth Fund                   13.74%               21.57%(1)                    --                  15.82%(1)

Balanced Fund                 11.63%               16.08%                    13.26%                    --

Bond Fund                      9.34%(2)             5.78%(2)                    --                   6.24%(2)
</TABLE>

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

(1)        Without expense reimbursements by the Advisor in 1994 and 1992, the
           Growth Fund's average annual return for the five-year period ended
           November 30, 1998 and for the period from commencement of operations
           through November 30, 1998 would have been 21.50% and 15.76%,
           respectively.

(2)        Without expense reimbursements by the Advisor in 1998, 1995, 1994,
           1993 and 1992, the Bond Fund's average annual return for the one-year
           and five-year periods ended November 30, 1998 and for the period from
           commencement of operations through November 30, 1998 would have been
           9.30%, 5.63% and 5.84%, respectively.







                                       18

<PAGE>   56


CURRENT YIELD

         Current yield quotations for the Funds are based on a 30-day (or
one-month) period, and are computed by dividing the net investment income per
share earned during the period by the maximum offering price per share on the
last day of the period, according to the following formula:


                            Yield=2[(a-b/cd+1)6-1]


WHERE:

         a     =    dividends and interest earned during the period;
         b     =    expenses accrued for the period (net of reimbursements);
         c     =    the  average  daily  number of shares  outstanding  during
                    the period  that were  entitled to receive dividends; and
         d     =    the maximum offering price per share on the last day of the
                    period.

         For purposes of this calculation, income earned on debt obligations is
determined by applying a calculated yield-to-maturity percentage to the
obligations held during the period. Interest earned on mortgage backed
securities will be calculated using the coupon rate and principal amount after
adjustment for a monthly paydown. Income earned on equity securities is
determined by using the stated annual dividend rate applied over the performance
period. Because the investment objectives of the Growth and Balanced Funds do
not relate solely to current income, these Funds will not typically advertise
yield. The yield for the Bond Fund for the 30-day period ended November 30, 1998
was 4.71%. When advertising yield, the Bond Fund will not advertise a one-month
or a 30-day period which ends more than 45 days before the date on which the
advertisement is published.

         The performance data for the Funds is based on historical results and
is not intended to indicate future performance. Each Fund's total return will
vary based on market conditions, Fund expenses, portfolio investments and other
factors. The value of a Fund's shares will fluctuate and an investor's shares
may be worth more or less than their original cost upon redemption.

OTHER PERFORMANCE INFORMATION

         Each Fund may from time to time advertise its comparative performance
as measured by various independent sources, including, without limitation,
Lipper Inc., Barron's, The Wall Street Journal, The New York Times, U.S.A.
Today, Weisenberger Investment Companies Service, Consumer Reports, Time,
Newsweek, U.S. News and World Report, Business Week, Financial World, U.S. News
and World Reports, Milwaukee Journal Sentinel, Wisconsin State


                                       19

<PAGE>   57


Journal, Forbes, Fortune, Money, Morningstar Publications, Standard &
Poors/Lipper Mutual Fund Profiles and The Individual Investor's Guide to No-Load
Mutual Funds. A Fund may also note its mention in, or inclusion in lists or
rankings prepared or published by, such independent sources and other
newspapers, magazines and media from time to time. However, the investment
company assumes no responsibility for the accuracy of such information. In
addition, each Fund may from time to time advertise its performance relative to
certain other mutual funds or groups of funds, indices and benchmark
investments, including, without limitation, the Value Line Index, Lipper Capital
Appreciation Fund Average, Lipper Growth Funds Average, Lipper General Equity
Funds Average, Lipper Equity Funds Average, Morningstar Growth Average,
Morningstar Equity Fund Average, Morningstar Hybrid Average, Morningstar All
Equity Funds Average, Lipper Balanced Funds Index, Lipper Balanced Funds
Average, Morningstar General Equity Average, Dow Jones Industrial Average, New
York Stock Exchange Composite Index, American Stock Exchange Composite Index,
Standard & Poor's 500 Stock Index, Russell 2000 Small Stock Index, Russell
Mid-Cap Stock Index, Russell 2500 Index, Standard & Poor's 400 Industrials,
Standard & Poor's 100, Wilshire 5000, Wilshire 4500, Wilshire 4000, Lehman
Brothers Intermediate Corporate/Government Bond Index, Nasdaq Industrials,
Nasdaq-OTC Price Index and Consumer Price Index.

         Each Fund may advertise its rankings as published by Lipper Inc. in its
categories or sub-categories, as well as its rating by Morningstar, Inc. The
Lipper and Morningstar averages are unweighted averages of total return
performance of mutual funds as classified, calculated and published by Lipper
and Morningstar. Morningstar's rating system is based on risk-adjusted total
return performance and is expressed in a star-rating format. The risk-adjusted
number is computed by subtracting a Fund's risk (which is a function of the
Fund's monthly returns less the three-month Treasury bill return) from the
Fund's load-adjusted total return score. This numerical score is then translated
into rating categories, with the top 10% labeled five star, the next 22.5%
labeled four star, then next 35% labeled three star, the next 22.5% labeled two
star and bottom 10% rated one star. A high rating reflects either above-average
returns or below-average risks, or both.


                                      TAXES

         Each Fund intends to qualify as a regulated investment company under
the Internal Revenue Code of 1986 (the "Code"), and to take all other action
required so that no federal income tax will be payable by the Fund itself. In
order to qualify as a regulated investment company, each Fund must satisfy a
number of requirements. If a Fund were to fail to qualify as a regulated
investment company under the Code, it would be treated as a regular corporation
whose net taxable income (including taxable dividends and net capital gains)
would be subject to income tax at the corporate level, and distributions to
shareholders would be subject to a second tax at the shareholder level.




                                       20

<PAGE>   58


         The dividends received deduction available to a corporate shareholder
with respect to certain ordinary income distributions from a Fund may be reduced
below 70% if the shareholder has incurred any indebtedness directly attributable
to its investment in Fund shares.

         Any ordinary income or capital gain distribution will reduce the net
asset value of Fund shares by the amount of the distribution. Although such a
distribution thus resembles a return of capital if received shortly after the
purchase of shares, it generally will be taxable to shareholders.

         All or part of any loss that a shareholder realizes on a redemption of
shares will be disallowed if the shareholder purchases other shares of the same
Fund (including by the automatic reinvestment of Fund distributions in
additional Fund shares) within 30 days before or after the redemption.

         Each Fund will be subject to a nondeductible 4% excise tax if it fails
to meet certain requirements with respect to distributions of net ordinary
income and capital gain net income. It is anticipated that this provision will
not materially affect the Funds or their shareholders. Dividends declared in
October, November or December to shareholders on a date in any such month and
paid during January of the following year will be treated as received by the
shareholders on December 31 of the year declared.

         Dividends and other distributions paid to individuals and other
non-exempt persons are subject to a 31% backup federal withholding tax if the
Transfer Agent is not provided with the shareholder's correct taxpayer
identification number or certification that the shareholder is not subject to
such backup withholding or if a Fund is notified that the shareholder has under
reported income in the past. In addition, such backup withholding tax will apply
to the proceeds of redemption or repurchase of shares from a shareholder account
for which the correct taxpayer identification number has not been furnished. For
most individual taxpayers, the taxpayer identification number is the social
security number. A shareholder may furnish the Transfer Agent with such number
and the required certifications by completing and sending the Transfer Agent
either the account application form accompanying the Prospectus or an IRS Form
W-9.

           The foregoing discussion of tax consequences is based on federal tax
 laws and regulations in effect on the date of this Statement of Additional
 Information, which are subject to change by legislative or administrative
 action.








                                       21

<PAGE>   59


                       CAPITAL STOCK AND OTHER SECURITIES

GENERAL

         The authorized capital stock of the Investment Company consists of 100
million shares of Common Stock, $.001 par value per share. The shares of Common
Stock are presented divided into three series: the Balanced Fund, Bond Fund and
Growth Fund. Each such series consists of 10 million shares of Common Stock. The
Board of Directors may authorize the issuance of additional series of Common
Stock (funds) and may increase or decrease the number of shares in each series.

         Each share of Common Stock has one vote and, when issued and paid for
in accordance with the terms of the Prospectus, will be fully paid and
nonassessable, except that shareholders are subject to personal liability under
Section 180.0622(2)(b) of the Wisconsin Business Corporation Law, as judicially
interpreted, for debts owing to employees of the Funds for services performed,
but not exceeding six months' service in any one case. The Funds currently have
no employees and do not intend to have employees in the future. Shares of Common
Stock are redeemable at net asset value, at the option of the shareholder.
Shares of Common Stock have no preemptive, subscription, conversion or
accumulative voting rights and are freely transferrable. Shares of Common Stock
can be issued as full shares or fractions of shares. If a fraction of share has
the same kind of rights and privileges as a full share.

         Shareholders have the right to vote on the election of the directors at
each meeting of shareholders at which directors are to be elected and on other
matters as provided by law or the Investment Company's Articles of Incorporation
or Bylaws. Shareholders of each Fund vote together to elect a single Board of
Directors of the Investment Company and on other matters affecting the entire
Investment Company, with each share entitled to a single vote. On matters
affecting only one Fund, only the shareholders of that Fund are entitled to
vote. On matters relating to all Funds, but affecting individual Funds
differently (such as a new Advisory Agreement), separate votes by shareholders
of each Fund are required. The Investment Company's Articles of Incorporation do
not require the holding of annual meetings of shareholders. However, special
meetings of shareholders may be called (and, at the request of shareholders
holding 10% or more of the Funds' outstanding shares must be called) for
purposes such as electing or removing directors, changing fundamental policies
or approving investment advisory contracts.

CONTROL PERSONS AND PRINCIPAL HOLDERS OF FUND SHARES

         As of December 31, 1998, the only persons known to management to
beneficially own 5% or more of the outstanding shares of the Balanced Fund were:
MUGGS & CO. (6.1%), c/o Firstar Trust Company, P.O. Box 1787, Milwaukee,
Wisconsin 53201-1787; and Anchorbank S.S.B. Retirement Balanced (7.24%), c/o Old
Kent Bank, 4420 44th Street, Suite A, Grand Rapids, Michigan 49512-4011. Old
Kent Bank, 4420 44th Street, Suite A, Grand Rapids,


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<PAGE>   60



Michigan 49512-4011, was the holder of record of 9.88% of the outstanding shares
of the Balanced Fund as of that date.

         As of December 31, 1998, the only persons known to management to
beneficially own 5% or more of the outstanding shares of the Bond Fund were:
CAPINCO (43.45%), c/o Firstar Trust Company, P.O. Box 1787, Milwaukee, Wisconsin
53201-1787; and Wisconsin Auto & Truck Dealers Association Trust (6.52%), 150
East Gilman Street, Madison, Wisconsin 53703. Old Kent Bank, One Vandenberg
Center, Grand Rapids, Michigan 49503, was the holder of record of 18.33% of the
outstanding shares of the Bond Fund as of that date.

         As of December 31, 1998, the only persons known to management to
beneficially own 5% or more of the outstanding shares of the Growth Fund was
Anchorbank S.S.B. Retirement Growth (6.61%), c/o Old Kent Bank, 4420 44th
Street, Suite A, Grand Rapids, Michigan 49512-4011. Old Kent Bank,4420 44th
Street, Suite A, Grand Rapids, Michigan 49512-4011, was the holder of record of
17.24% of the outstanding shares of the Growth Fund as of that date.

         As of December 31, 1998, no person, other than those named in the
preceding three paragraphs, was known to the Funds to hold of record 5% or more
of the outstanding shares of, or to control, any of the Funds.


                              FINANCIAL STATEMENTS

         The financial statements and related report of PricewaterhouseCoopers
LLP, independent accountants, contained in the Annual Report to Shareholders for
the fiscal year ended November 30, 1998 are incorporated by reference herein. A
copy of the Annual Report to Shareholders may be obtained without charge by
writing to Thompson, Plumb & Associates, Inc., 1200 John Q. Hammons Drive,
Madison, Wisconsin 53717, or by calling 1-800-999-0887 or (608) 831-1300.





















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