THOMPSON PLUMB FUNDS INC
N-30D, 1998-07-24
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<PAGE>   1
                              SEMIANNUAL REPORT
                                 May 31,1998
                                      
                                      
                                      
                                      
                                      
                                      
                         THOMPSON PLUMB BALANCED FUND
                                      
                           THOMPSON PLUMB BOND FUND
                                      
                          THOMPSON PLUMB GROWTH FUND
                                      
                                      
                                      
                                      
                       8201 Excelsior Drive, Suite 200
                           Madison, Wisconsin 53717
                          Telephone: (608) 831-1300
                                     (800) 999-0887
                             www.thompsonplumb.com
                                      
                       -------------------------------
<PAGE>   2
                          Thompson Plumb Funds, Inc.
                          --------------------------
                                      
July 15, 1998
                        SEMIANNUAL REPORT TO SHAREHOLDERS
Dear Fellow Shareholder:

We are proud to present you the following report depicting the investments and
returns of our family of mutual funds for the six month period ending May 31,
1998. Our funds again achieved strong performance results during the six month
period. The goals for each fund are as follows:

THOMPSON PLUMB BALANCED FUND
This Fund seeks to realize 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.

THOMPSON PLUMB BOND FUND
This Fund seeks a high 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.

THOMPSON PLUMB GROWTH FUND
This 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.

We hope that you find the report clear and concise and that it provides you with
a sufficient amount of detailed information in order to be able to review your
investment. Please visit our web site (http://www.thompsonplumb.com) for updated
daily information or call with any comments or questions.

Sincerely,




John W. Thompson, CFA                            Thomas G. Plumb, CFA
Chairman & Secretary                             President & Treasurer






<PAGE>   3


                           THOMPSON PLUMB FUNDS, INC.
                        SEMIANNUAL REPORT TO SHAREHOLDERS

                                  MAY 31, 1998

                                    CONTENTS


                                                                         Page(s)
REPORT TO SHAREHOLDERS ...............................................        1

OVERALL INVESTMENT REVIEW ............................................        3

FINANCIAL STATEMENTS
     Statements of assets and liabilities ............................        4
     Schedules of investments ........................................      5-9
     Statements of operations ........................................       10
     Statements of changes in net assets .............................       11
     Notes to financial statements ...................................    12-16
     Financial highlights ............................................    17-19





This semiannual report is authorized for distribution to prospective investors
only when preceded or accompanied by a Fund prospectus which contains facts
concerning the Funds' objectives and policies, management, expenses, and other
information.

                                       


                                        2


<PAGE>   4





                           THOMPSON PLUMB FUNDS, INC.
                        SEMIANNUAL REPORT TO SHAREHOLDERS

                                  JULY 15, 1998

                            OVERALL INVESTMENT REVIEW

Remarkably strong economic growth, coupled with surprisingly low inflation,
characterized the first six months of the fiscal year. Plentiful jobs and rising
wages put American households in a buying mood, and consumer spending spurred
fast growth in the U.S. economy. Despite a full employment level that usually
has been inflationary in the past, neither consumer nor wholesale prices have
accelerated. In fact, wholesale prices have declined during the past year and
consumer inflation has slowed. Stiff competitive pressure, including an
increasing flow of imported products and materials, appears to be keeping a lid
on prices in spite of the surging economy. Wage pressures are still likely to
increase somewhat, but labor costs should continue to be partly offset by
productivity improvements.

In this setting, stocks continued to do very well, with the big "blue chips"
again leading the market. Interest rates declined slightly, reflecting less
concern about inflation by fixed income investors. In the first six months of
their fiscal year, your Funds' total returns were 8.99 percent for the Balanced
Fund, 3.90 percent for the Bond Fund, and 11.68 percent for the Growth Fund.
These gains for the Balanced and Growth Funds are gratifying, coming on top of
above-average returns in the past several years. While returns for all bond
funds have lagged far behind stocks in recent years, inflation-adjusted returns
on bonds are still excellent on an absolute basis.

Looking ahead, economic troubles in Asia have resulted in lower prices for many
imported goods and are being blamed by some U.S. companies for earnings
disappointments. While Asia's problems haven't yet slowed our growth very much,
some slowing is likely and desirable, lest inflation finally starts to pick up.
We believe that the economy will slow to a sustainable pace, and that the
well-established, secular disinflation trend is intact. Interest rates should,
therefore, remain generally quite stable over the next several years.

Stocks of very large, "blue chip" companies have now led the bull market for
several years and generally sell at relatively high price-earnings multiples. In
contrast, many intermediate-to-smaller-size stocks sell at reasonable
valuations. For this reason, we are now finding attractive stocks mostly among
these smaller companies. Given our outlook for well-contained inflation,
reasonable interest rates and a prospering U.S. economy, we remain optimistic
over the long-term for stock and bond markets. By weathering the short-term
corrections in these markets, we believe we can continue to provide you with
very competitive investment returns in the years ahead.


                                        3



<PAGE>   5


                           THOMPSON PLUMB FUNDS, INC.
                      STATEMENTS OF ASSETS AND LIABILITIES
                            MAY 31, 1998 (UNAUDITED)
                    (In thousands, except per share amounts)

                                                           
<TABLE>
<CAPTION>
                                                             BALANCED FUND           BOND FUND             GROWTH FUND  
<S>                                                             <C>                    <C>                   <C>
ASSETS
   Investments, at market value (Cost $35,621,
     $31,290, and $50,156, respectively)
     Common stocks ....................................         $31,396                      -               $ 64,255
     Bonds ............................................          12,304                $31,236                      -
     Short-term investments ...........................             162                    858                     58
                                                                -------                -------               --------
                                                                 43,862                 32,094                 64,313
   Receivable from investment advisor..................               -                      2                      -
   Prepaid expenses ...................................              18                     13                     23
   Due from sale of securities ........................             848                      -                     73
   Dividends and interest receivable ..................             287                    475                     44
                                                                -------                -------               --------
       Total Assets ...................................          45,015                 32,584                 64,453
                                                                -------                -------               --------


LIABILITIES
   Due on purchase of securities ......................             454                    265                    120
   Accrued expenses payable ...........................              18                     10                     21
   Due to investment advisor ..........................              39                     23                     63
                                                                -------                -------               --------
       Total Liabilities ..............................             511                    298                    204
                                                                -------                -------               --------
NET ASSETS ............................................         $44,504                $32,286               $ 64,249
                                                                =======                =======               ========


Net Assets consist of:
   Capital stock ($.001 par value) ....................         $34,164                $31,324               $ 47,723
   Undistributed net investment income (loss) .........             211                    425                    (15)
   Net realized gain (loss) on investments ............           1,888                   (267)                 2,384
   Net unrealized appreciation on
     investments ......................................           8,241                    804                 14,157
                                                                -------                -------               --------
       Net Assets......................................         $44,504                $32,286                $64,249
                                                                =======                =======                =======

   Shares of capital stock outstanding
     (100,000 shares authorized).......................           2,510                  3,027                  1,602

   Offering and redemption price/Net asset
     value per share ..................................          $17.73                 $10.67                 $40.11
                                                                 ======                 ======                 ======
</TABLE>


                       See Notes to Financial Statements.

                                        4

<PAGE>   6


                           THOMPSON PLUMB FUNDS, INC.
                            SCHEDULES OF INVESTMENTS
                            MAY 31, 1998 (UNAUDITED)


                                     Shares or           
                                     Principal    Market  
                                      Amount      Value  
                                      ------      -----

BALANCED FUND

COMMON STOCKS - 71.6%

  BASIC MATERIALS - 2.9%
    FiberMark (a) ..................    38,500  $ 745,937
    Sigma-Aldrich ..................    15,000    547,500
                                                ---------
                                                1,293,437
                                                ---------
  CAPITAL GOODS - 8.0%
    Advanced Lighting (a) ..........    27,500    690,938
    Boeing .........................    12,500    595,312
    Emerson Electric ...............     5,000    303,750
    General Electric ...............    10,000    833,750
    Howmet International (a)........    30,000    453,750
    Xerox ..........................     6,000    616,500
                                                ---------
                                                3,494,000
                                                ---------
  CONSUMER PRODUCTS - 6.5%
    Bestfoods ......................     5,000    282,188
    Discount Auto Parts (a) ........    12,000    308,250
    Kimberly-Clark .................     6,000    297,375
    Northland Cranberries - Class A.    25,000    395,312
    PepsiCo ........................    20,000    816,250
    Philip Morris ..................    20,000    747,500
                                                ---------
                                                2,846,875
                                                ---------
  ENERGY - 3.3%
    Chevron ........................     6,500    519,188
    Exxon ..........................    13,000    916,500
                                                ---------
                                                1,435,688
                                                ---------
  FINANCIAL SERVICES - 9.5%
    Anchor Bancorp Wisconsin .......    12,000    508,500
    Associated Banc-Corp ...........     8,000    396,000
    Banc One .......................    13,200    727,650
    CIT Group - Class A ............    20,000    630,000
    Fannie Mae .....................    10,500    628,688
    Hartford Life - Class A ........    12,000    618,000
    Household International ........     5,000    676,562
                                                ---------
                                                4,185,400
                                                ---------


  HEALTH CARE - 13.4%
    Abbott Laboratories ............     6,000 $  445,125
    BioChem Pharma (a)...............   15,000    393,750
    HEALTHSOUTH (a)..................   20,000    567,500
    Johnson & Johnson ..............    10,000    690,625
    Medtronic ......................    10,000    556,250
    Merck & Co. ....................     7,800    913,087
    Sofamor Danek Group (a).........    10,000    831,250
    Sybron International (a) .......    22,500    538,594
    Thermo Electron (a) .............   20,000    702,500
    Young Innovations (a) ..........    15,000    236,250
                                                ---------
                                                5,874,931
                                                ---------
  RETAIL - 3.2%
    AutoZone (a) ...................    10,000    332,500
    Fastenal .......................    10,000    495,000
    Walgreen .......................    16,000    563,000
                                                ---------
                                                1,390,500
                                                ---------
  SERVICES - 6.6%
   BA Merchant Services - Class A (a)   35,000    632,188
   CBS (a) .........................    24,000    762,000
   HA-LO Industries (a) ............    10,000    309,375
   Merrill .........................    27,500    622,187
   New York Times - Class A ........     8,000    564,000
                                                ---------
                                                2,889,750
                                                ---------
  TECHNOLOGY - 13.9%
   CheckFree Holdings (a) ..........    12,000    272,250
   EMC (a) .........................    21,000    870,188
   Intel ...........................     8,000    571,500
   Lattice Semiconductor (a) .......    18,000    695,250
   Linear Technology ...............    11,000    769,313
   Maxim Integrated Products (a)....    20,000    667,500
   Microchip Technology (a).........    30,000    735,000
   Synopsys (a) ....................    15,000    644,062
   Zebra Technologies - Class A (a).    23,000    882,625
                                                ---------
                                                6,107,688
                                                ---------
  TELECOMMUNICATIONS - 4.3%
   ADC Telecommunications (a) ......    25,000    703,125
   MCI Communications ..............    10,000    534,688
   Northern Telecom Limited ........    10,000    640,000
                                                ---------
                                                1,877,813
                                                ---------
    TOTAL COMMON STOCKS
      (COST $23,404,252) ...........           31,396,082
                                               ----------



                       See Notes to Financial Statements.

                                       5
<PAGE>   7
                          THOMPSON PLUMB FUNDS, INC.
                           SCHEDULES OF INVESTMENTS
                           MAY 31, 1998 (UNAUDITED)
                                 (Continued)


                                     Shares or           
                                     Principal    Market  
                                      Amount      Value  
                                      ------      -----

BONDS - 28.0%

  CORPORATE BONDS - 23.3%
    Aetna Services
      6.375% Due 08/15/03 .......... 1,000,000 $1,001,852
    Aetna Services
      7.125% Due 08/15/06 .......... 1,500,000  1,552,329
    American Home Products
      7.900% Due 02/15/05 .......... 2,000,000  2,195,850
    General Electric Capital
      8.750% Due 05/21/07 ..........   640,000    754,214
    Johnson Controls
      6.300% Due 02/01/08 .......... 2,000,000  2,020,878
    Philip Morris
      6.375% Due 02/01/06 .......... 1,000,000    991,738
    Union Pacific
      6.000% Due 09/01/03 ..........   685,000    668,718
    Wisconsin Power & Light
      7.000% Due 06/15/07 .......... 1,000,000  1,054,555
                                               ----------
    Total Corporate Bonds ..........           10,240,134
                                               ----------


  UNITED STATES GOVERNMENT
    AND AGENCY ISSUES - 4.7%
    United States Treasury Notes
      6.500% Due 05/31/02 .......... 2,000,000  2,063,750
                                               ----------

    Total United States Government
      and Agency Issues  ...........            2,063,750
                                               ----------

    TOTAL BONDS
      (COST $12,055,260) ...........           12,303,884
                                               ----------

SHORT-TERM INVESTMENTS - 0.4%

  VARIABLE RATE DEMAND NOTES - 0.4%
    Johnson Controls ...............   68,012$     68,012
    Pitney Bowes Credit ............   94,067      94,067
                                               ----------

    Total Variable Rate Demand 
      Notes ........................              162,079
                                               ----------

    TOTAL SHORT-TERM INVESTMENTS
      (COST $162,079) ..............              162,079
                                               ----------

    TOTAL INVESTMENTS - 100.0%
      (COST $35,621,591) ...........          $43,862,045
                                              ===========


(a) Non-income producing




                       See Notes to Financial Statements.



                                       6
<PAGE>   8
                          THOMPSON PLUMB FUNDS, INC.
                           SCHEDULES OF INVESTMENTS
                           MAY 31, 1998 (UNAUDITED)
                                 (Continued)

                                     Shares or           
                                     Principal    Market  
                                      Amount      Value  
                                      ------      -----

BOND FUND

BONDS - 97.3%

  Corporate Bonds - 91.9%
    American Home Products
      7.900% Due 02/15/05 .......... 1,000,000 $1,097,925
    Anheuser-Busch
      7.100% Due 06/15/07 .......... 1,000,000  1,045,792
    AT & T
      7.000% Due 05/15/05 .......... 1,000,000  1,049,735
    Dayton Hudson
      6.400% Due 02/15/03 .......... 1,000,000  1,008,475
    Disney, Walt
      6.750% Due 03/30/06 .......... 1,000,000  1,044,699
    duPont, E. I. de Nemours
      6.750% Due 09/01/07 .......... 1,000,000  1,044,815
    General Electric Capital
      8.750% Due 05/21/07 ..........   750,000    883,845
    Hartford Life
      6.900% Due 06/15/04 .......... 1,000,000  1,029,617
    Hartford Life
      7.100% Due 06/15/07 ..........   500,000    523,144
    Hershey Foods
      6.700% Due 10/01/05 .......... 1,000,000  1,038,000
    Household Bank
      6.870% Due 05/15/01 .......... 1,000,000  1,017,228
    Johnson Controls
      6.300% Due 02/01/08 .......... 1,198,000  1,210,506
    Lucent Technologies
      7.250% Due 07/15/06 .......... 1,000,000  1,075,798
    Maytag
      8.875% Due 07/15/99 ..........   500,000    515,504
    Michigan Consolidated Gas
      7.210% Due 05/01/07 ..........   500,000    532,437
    Morgan, J. P.
      6.700% Due 11/01/07 ..........   500,000    512,484
    NationsBank
      6.690% Due 04/03/02 .......... 1,000,000  1,022,737
    Northern Trust
      7.300% Due 09/15/06 .......... 1,000,000  1,063,727
    Norwest Financial
      6.250% Due 11/01/02 ..........   785,000 $  791,486
    Penney, J. C.
      7.600% Due 04/01/07 .......... 1,000,000  1,079,677
    Philip Morris
      9.000% Due 01/01/01 .......... 1,000,000  1,062,481
    Philip Morris
      7.650% Due 07/01/08 ..........   500,000    533,498
    Schwab, Charles
      6.520% Due 05/27/08  ......... 1,000,000  1,010,460
    Sears, Roebuck
      6.700% Due 11/15/06 .......... 1,000,000  1,024,061
    SmithKline Beecham
      7.375% Due 04/15/05 ..........   950,000  1,023,663
    Time Warner
      7.950% Due 02/01/00 .......... 1,000,000  1,027,589
    Travelers Property & Casualty
      6.750% Due 04/15/01 .......... 1,000,000  1,019,646
    Tribune
      6.875% Due 11/01/06 .......... 1,000,000  1,042,346
    Wal-Mart Stores
      7.500% Due 05/15/04 .......... 1,000,000  1,073,581
    Wells Fargo
      7.125% Due 08/15/06 .......... 1,000,000  1,051,247
    Wisconsin Power & Light
      7.000% Due 06/15/07 .......... 1,000,000  1,054,555
                                               ----------

    Total Corporate Bonds ..........           29,510,758
                                               ----------
  UNITED STATES GOVERNMENT
      AND AGENCY ISSUES - 5.4%
    Federal Home Loan Banks
      7.250% Due 10/30/02 .......... 1,000,000  1,010,265
    United States Treasury Notes
      6.750% Due 04/30/00 ..........   700,000    714,875
                                               ----------
    Total United States Government
      and Agency Issues ............            1,725,140
                                               ----------
    TOTAL BONDS
      (COST $30,432,014) ...........           31,235,898
                                               ----------

                       See Notes to Financial Statements.
                                       7
<PAGE>   9
                          THOMPSON PLUMB FUNDS, INC.
                           SCHEDULES OF INVESTMENTS
                           MAY 31, 1998 (UNAUDITED)
                                 (Continued)


                                      Shares or           
                                      Principal    Market  
                                       Amount      Value  
                                       ------      -----

SHORT-TERM INVESTMENTS - 2.7%

  VARIABLE RATE DEMAND NOTES - 2.7%
    Johnson Controls ...............  480,672 $   480,672
    Pitney Bowes Credit ............  377,205     377,205
                                              -----------


    Total Variable Rate Demand 
      Notes ........................              857,877
                                              -----------


    TOTAL SHORT-TERM INVESTMENTS
      (COST $857,877) ..............              857,877
                                              -----------


    TOTAL INVESTMENTS - 100.0%
      (COST $31,289,891) ...........          $32,093,775
                                              ===========


GROWTH FUND

COMMON STOCKS - 99.9%

  BASIC MATERIALS - 2.6%
    Sigma-Aldrich ..................   45,000 $ 1,642,500
                                              -----------

  CAPITAL GOODS - 8.4%
    Advanced Lighting (a) ..........   45,000   1,130,625
    Boeing .........................   10,000     476,250
    Emerson Electric ...............   15,000     911,250
    Howmet International (a) .......   70,000   1,058,750
    Minnesota Mining & Manufacturing   20,000   1,852,500
                                              -----------
                                                5,429,375
                                              -----------

  CONSUMER PRODUCTS - 10.5%
    Kimberly-Clark .................   40,000   1,982,500
    Northland Cranberries - Class A.   50,000     790,625
    PepsiCo ........................   50,000   2,040,625
    Philip Morris ..................   52,000   1,943,500
                                              -----------
                                                6,757,250
                                              -----------

  ENERGY - 3.4%
    Chevron ........................   14,000   1,118,250
    Exxon ..........................   15,000   1,057,500
                                              -----------
                                                2,175,750
                                              -----------

  FINANCIAL SERVICES - 17.7%
    Associated Banc-Corp ...........   18,000     891,000
    Associates First Capital - Class A 21,000   1,571,063
    CIT Group - Class A ............   50,000   1,575,000
    Fannie Mae .....................   27,000   1,616,625
    Hartford Life - Class A ........   30,000   1,545,000
    Household International ........    8,000   1,082,500
    MGIC Investment ................   10,000     599,375
    Morgan, J. P.  .................    5,000     620,937
    NationsBank ....................   25,000   1,893,750
                                              -----------
                                               11,395,250
                                              -----------



                       See Notes to Financial Statements.

                                       8


<PAGE>   10
                          THOMPSON PLUMB FUNDS, INC.
                           SCHEDULES OF INVESTMENTS
                           MAY 31, 1998 (UNAUDITED)
                                 (Continued)

                                       Shares or           
                                       Principal    Market  
                                        Amount      Value  
                                        ------      -----
COMMON STOCKS - 99.9% (Continued)

  HEALTH CARE - 20.6%
    Abbott Laboratories ............    12,000 $  890,250
    BioChem Pharma (a) .............    20,000    525,000
    DENTSPLY International .........    50,000  1,687,500
    Johnson & Johnson ..............    24,000  1,657,500
    Medtronic ......................    10,000    556,250
    Merck & Co.  ...................    18,000  2,107,125
    Schein, Henry (a) ..............    20,000    770,000
    Sofamor Danek Group (a) ........    23,000  1,911,875
    Sybron International (a) .......    45,000  1,077,188
    Thermo Electron (a) ............    40,000  1,405,000
    Young Innovations (a) ..........    40,000    630,000
                                               ----------
                                               13,217,688
                                               ----------
  RETAIL - 7.1%
    Albertson's ....................    18,000    833,625
    AutoZone (a) ...................    53,000  1,762,250
    Fastenal .......................    30,000  1,485,000
    Walgreen .......................    14,000    492,625
                                               ----------
                                                4,573,500
                                               ----------
  SERVICES - 8.0%
    BA Merchant Services - Class A 
      (a)...........................    72,000  1,300,500
    BISYS Group (a) ................    18,000    668,250
    CBS (a) ........................    44,000  1,397,000
    Merrill ........................    33,000    746,625
    New York Times - Class A .......    15,000  1,057,500
                                               ----------
                                                5,169,875
                                               ----------
  TECHNOLOGY - 21.6%
    EMC (a) ........................   58,000$  2,403,375
    Intel ..........................   16,000   1,143,000
    Lattice Semiconductor (a) ......   34,000   1,313,250
    Linear Technology ..............   28,000   1,958,250
    Maxim Integrated Products (a) ..   30,000   1,001,250
    Microchip Technology (a) .......   33,000     808,500
    Parametric Technology (a) ......   38,000   1,164,939
    Sterling Commerce (a) ..........   24,000     952,500
    Synopsys (a) ...................   34,000   1,459,875
    Zebra Technologies - Class A 
      (a) ..........................   44,000   1,688,500
                                               ----------
                                               13,893,439
                                               ----------
    TOTAL COMMON STOCKS
      (COST $50,097,629) ...........           64,254,627
                                              -----------
SHORT-TERM INVESTMENTS - 0.1%

  VARIABLE RATE DEMAND NOTES - 0.1%
    Johnson Controls ...............   58,102      58,102
                                               ----------
    Total Variable Rate Demand 
      Notes ........................               58,102
                                               ----------
    TOTAL SHORT-TERM INVESTMENTS
      (COST $58,102) ...............               58,102
                                               ----------
    TOTAL INVESTMENTS - 100.0%
      (COST $50,155,731) ...........          $64,312,729
                                              ===========
(a) Non-income producing


                       See Notes to Financial Statements.

                                        9
<PAGE>   11

                                    

                           THOMPSON PLUMB FUNDS, INC.
                            STATEMENTS OF OPERATIONS
                   FOR THE SIX MONTH PERIOD ENDED MAY 31, 1998
                                   (UNAUDITED)
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                 BALANCED FUND      BOND FUND        GROWTH FUND  
<S>                                                                 <C>                <C>              <C> 

INVESTMENT INCOME
   Dividends ......................................                $   115                 -           $   366
   Interest .......................................                    365           $   994                17
                                                                     -----            ------            ------
                                                                       480               994               383
                                                                     -----            ------            ------
EXPENSES
   Accounting services fees .......................                     37                30                46
   Directors fees .................................                      5                 4                 6
   Federal & state registration ...................                     13                13                14
   Investment advisory fees .......................                    172               100               276
   Professional fees ..............................                     14                12                18
   Shareholder servicing costs ....................                     13                 2                20
   Other expenses .................................                     15                 7                18
                                                                     -----             -----            ------
     Total expenses................................                    269               168               398
     Less expenses reimbursable by advisor.........                      -                 2                 -
                                                                     -----             -----            ------
Net expenses.......................................                    269               166               398
                                                                     -----             -----            ------
NET INVESTMENT INCOME (LOSS) ......................                    211               828               (15)
                                                                     -----             -----            ------
Net realized gain on investments ..................                  1,888               114             2,393
Net unrealized appreciation on investments ........                  1,227               279             3,281
                                                                     -----             -----            ------
NET GAIN ON INVESTMENTS ...........................                  3,115               393             5,674
                                                                     -----             -----            ------
Net increase in net assets resulting from
   operations .....................................                $ 3,326           $ 1,221           $ 5,659
                                                                   =======           =======           =======

</TABLE>





                       See Notes to Financial Statements.

                                       10
<PAGE>   12



                           THOMPSON PLUMB FUNDS, INC.
                       STATEMENTS OF CHANGES IN NET ASSETS
                     FOR THE SIX MONTH PERIOD ENDED MAY 31,
                                   (UNAUDITED)
                                 (In thousands)
<TABLE>
<CAPTION>
                                                       BALANCED FUND             BOND FUND             GROWTH FUND  
                                                    ------------------      ------------------      ------------------
                                                      1998        1997       1998       1997         1998       1997
                                                      ----        ----       ----       ----         ----       ----
<S>                                                <C>        <C>          <C>         <C>          <C>        <C>
INCREASE IN NET ASSETS
   Operations
     Net investment income (loss) ................  $   211    $   133      $   828    $   694      $   (15)   $   (33)
     Net realized gain (loss) on investments .....    1,888      1,312          114       (220)       2,393      1,288
     Net unrealized appreciation
         (depreciation) on investments ...........    1,227        581          279       (659)       3,281      1,920
                                                      -----      -----        -----      -----        -----      -----

     Net increase (decrease) in net assets resulting
         from operations .........................    3,326      2,026        1,221       (185)       5,659      3,175
                                                      -----      -----        -----      -----        -----      -----


DISTRIBUTIONS TO SHAREHOLDERS
     Distributions from net investment income ....     (261)      (294)        (819)      (576)           -          -
     Distributions from net realized gains on
       securities transactions ...................   (3,478)    (1,724)           -          -       (3,968)    (1,838)
                                                     ------     ------       ------     ------       ------     ------ 

   Total distributions to shareholders ...........   (3,739)    (2,018)        (819)      (576)      (3,968)    (1,838)
                                                     ------     ------       ------     ------       ------     ------ 

FUND SHARE TRANSACTIONS...........................    8,580      9,878         (253)     7,073       17,182      7,828
                                                      -----      -----         ----      -----       ------      -----


TOTAL INCREASE IN NET ASSETS .....................    8,167      9,886          149      6,312       18,873      9,165

NET ASSETS
   Beginning of period ...........................   36,337     20,769       32,137     22,153       45,376     24,077
                                                     ------     ------       ------     ------       ------     ------


   End of period ................................   $44,504    $30,655      $32,286    $28,465      $64,249    $33,242
                                                    =======    =======      =======    =======      =======    =======


   Accumulated undistributed net investment
     income (loss) included in net assets at end
     of period....................................      $211   $    45      $   425    $   395      $   (15)   $   (33)

</TABLE>


                       See Notes to Financial Statements.

                                       11

<PAGE>   13
                           THOMPSON PLUMB FUNDS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                            MAY 31, 1998 (UNAUDITED)

NOTE 1 - ORGANIZATION
Thompson Plumb Funds, Inc. (the "Company") is a Wisconsin corporation registered
under the Investment Company Act of 1940, as amended (the "1940 Act"), as an
open-end, diversified management investment company.

The Company is a series of separate mutual funds: Thompson Plumb Balanced Fund
(the "Balanced Fund"), Thompson Plumb Bond Fund (the "Bond Fund"), and Thompson
Plumb Growth Fund (the "Growth Fund"), collectively the "Funds." The assets and
liabilities of each Fund are segregated and a shareholder's interest is limited
to the Fund in which the shareholder owns shares.

NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES
The following is a summary of significant accounting policies followed by the
Funds in the preparation of their financial statements.

SECURITY VALUATION - 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 market value as determined in good faith by the Advisor
(Thompson, Plumb & Associates, Inc.) pursuant to procedures established under
the general supervision and responsibility of the Board of Directors of Thompson
Plumb Funds, Inc.

REALIZED GAINS AND LOSSES ON SECURITIES - Gains or losses realized on sales of
securities are determined by comparing the identified cost of the security lot
sold with the net sales proceeds.

VARIABLE-RATE DEMAND NOTES - The Funds invest in short-term, variable-rate
demand notes, which are unsecured instruments. The Funds may be susceptible to
credit risk with respect to these instruments to the extent the issuer defaults
on its payment obligation. Each Fund's policy is to not purchase variable-rate
demand notes unless at the time of purchase the issuer has unsecured debt
securities outstanding that have received a rating within the two highest
categories from either Standard & Poor's (that is, A-1, A-2 or AAA,AA) or
Moody's Investors Service, Inc. (that is, Prime-1, Prime-2 or Aaa, Aa).
Accordingly, the Funds do not anticipate nonperformance of these obligations by
the issuers. 



                                       12

<PAGE>   14
                           THOMPSON PLUMB FUNDS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                            MAY 31, 1998 (UNAUDITED)
                                  (Continued)

PERMANENT BOOK AND TAX DIFFERENCES - Generally accepted accounting
principles require that permanent financial reporting and tax differences
relating to shareholder distributions be reclassified to paid-in capital.

OTHER - Investment securities transactions are accounted for on the trade date.
Discounts and premiums on securities purchased are amortized over the life of
the respective securities on the same basis for book and tax purposes. Dividend
income is recorded on the ex-dividend date. Interest income is recorded as
earned. Each Fund is charged for those expenses that are directly attributed to
it, such as advisory, custodial, accounting services and certain shareholder
servicing fees, while other expenses that cannot be directly attributable to a
Fund are allocated among the Funds in proportion to the net assets of the
respective Fund.

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from these estimates.

NOTE 3 - INVESTMENT ADVISORY & ACCOUNTING SERVICES AGREEMENTS AND OTHER
TRANSACTIONS WITH AFFILIATES
The Company has entered into an Advisory Agreement with Thompson, Plumb &
Associates, Inc. (the "Advisor") for management of each Fund's portfolio and for
the administration of other Fund affairs. As compensation for its services, the
Advisor receives a fee computed daily and payable monthly as follows: (i) for
the Balanced Fund, .85 of 1% of average daily net assets up to $50 million and
 .80 of 1% of average daily net assets in excess of $50 million; (ii) for the
Bond Fund, .65 of 1% of average daily net assets up to $50 million and .60 of 1%
of average daily net assets in excess of $50 million; (iii) for the Growth Fund,
1.00% of average daily net assets up to $50 million and .90 of 1% of average
daily net assets in excess of $50 million.

Pursuant to an Accounting Services Agreement, the Advisor maintains the Funds'
financial records in accordance with the 1940 Act, prepares all necessary
financial statements of the Funds, and calculates the net asset value per share
of the Funds on a daily basis. As compensation for its services, each Fund pays
the Advisor a fee computed daily and payable monthly at the annual rate of .20
of 1% of net assets up to $30 million and .125 of 1% of net assets in excess of
$30 million, with a minimum fee of $30,000 per year.




                                       13

<PAGE>   15
                           THOMPSON PLUMB FUNDS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                            MAY 31, 1998 (UNAUDITED)
                                  (Continued)


NOTE 4 - FUND SHARE TRANSACTIONS
Transactions in shares of the Funds during the six months ended May 31, 1998 and
1997 were as follows: (In thousands)

<TABLE>
<CAPTION>

                                                                 1998                                   1997
- ---------------------------------------------------------------------------------------------------------------------------
                                                       Shares             Dollars          Shares            Dollars
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>              <C>                 <C>             <C>

BALANCED FUND
Shares sold                                               378             $ 6,678              732           $ 11,367
Shares issued in reinvestment of dividends                 16                 252               19                283
Shares issued in reinvestment of realized gains           215               3,401              112              1,660
Shares redeemed                                          (100)             (1,751)            (224)            (3,432)
- ---------------------------------------------------------------------------------------------------------------------------
   Net increase                                           509             $ 8,580              639            $ 9,878
===========================================================================================================================

BOND FUND
Shares sold                                               328             $ 3,478            1,010            $10,414
Shares issued in reinvestment of dividends                 75                 787               53                541
Shares redeemed                                          (426)             (4,518)            (380)            (3,882)
- ---------------------------------------------------------------------------------------------------------------------------
   Net increase (decrease)                                (23)            $  (253)             683           $  7,073
===========================================================================================================================

GROWTH FUND
Shares sold                                               383             $15,069              295           $  9,177
Shares issued in reinvestment of realized gains           111               3,900               54              1,629
Shares redeemed                                           (45)             (1,787)             (94)            (2,978)
- ---------------------------------------------------------------------------------------------------------------------------
   Net increase                                           449             $17,182              255           $  7,828
===========================================================================================================================

</TABLE>




                                       14
<PAGE>   16
                           THOMPSON PLUMB FUNDS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                            MAY 31, 1998 (UNAUDITED)
                                  (Continued)

NOTE 5 - DISTRIBUTIONS TO SHAREHOLDERS
Distributions to shareholders from net investment income and realized gains on
securities for the Balanced Fund and the Growth Fund normally will be declared
on an annual basis within 30 days and paid within 60 days following the Funds'
fiscal year-end. Bond Fund distributions to shareholders from net investment
income normally will be declared on a quarterly basis within 30 days and paid
within 60 days following the Fund's fiscal quarter, and distributions to
shareholders from realized gains on securities normally will be declared on an
annual basis within 30 days and paid within 60 days following the Fund's fiscal
year-end. Distributions are recorded on the ex-dividend date.

For the period ended February 28, 1998, a distribution from net investment
income for the Bond Fund was declared March 24, 1998 payable to shareholders on
March 25, 1998. For the period ended November 30, 1997, a capital gains
distribution for the Balanced Fund and the Growth Fund and a distribution from
net investment income for the Balanced Fund and the Bond Fund were declared
December 24, 1997 payable to shareholders on December 26, 1997.




<TABLE>
<CAPTION>
                                                BALANCED FUND               BOND FUND                GROWTH FUND  
                                            ---------------------     ---------------------      ---------------------
                                               Total        Per           Total        Per           Total        Per
                                            Distribution   Share      Distribution    Share      Distribution    Share
                                            ------------   -----      ------------    -----      ------------    -----
<S>                                          <C>            <C>          <C>          <C>         <C>            <C>

Distributions to Shareholders
   1998 Net investment income                         -         -        $259,231     $0.09                -         -
   1997 Net investment income                $  261,244     $0.13        $559,725     $0.18                -         -
   1997 Long-term capital gains              $2,451,413     $1.21               -         -       $1,663,017     $1.41
   1997 Short-term capital gains             $1,026,307     $0.50               -         -       $2,305,446     $1.95

</TABLE>



                                      15



<PAGE>   17
                           THOMPSON PLUMB FUNDS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                            MAY 31, 1998 (UNAUDITED)
                                   (Continued)

NOTE 6 - PURCHASE AND SALE OF SECURITIES
Investment transactions for the six months ended May 31, 1998 were as follows:

                            BALANCED FUND     BOND FUND      GROWTH FUND

U. S. GOVERNMENT SECURITIES
     Purchases              $  1,028,516     $1,023,594               -
     Sales                  $  1,039,688     $4,388,969               -

SECURITIES OTHER THAN
U. S. GOVERNMENT AND
SHORT-TERM INVESTMENTS
     Purchases               $16,128,559     $5,836,676     $29,106,975
     Sales                   $10,903,411     $2,694,770     $14,101,957

NOTE 7 - FEDERAL INCOME TAXES
No provision has been made for Federal income taxes since the Funds have elected
to be taxed as regulated investment companies and intend to distribute
substantially all income to shareholders and otherwise comply with the
provisions of the Internal Revenue Code applicable to regulated investment
companies. The Bond Fund has $177,789 of net capital losses which expire
November 30, 2002 and $200,225 of net capital losses which expire November 30,
2005 that may be used to offset capital gains in future years to the extent
provided by tax regulations.

The Bond Fund incurred $3,031 of post-October capital losses, during 1997, which
may be used to offset capital gains in future years to the extent provided by
tax regulations.

For Federal income tax purposes at May 31, 1998:


<TABLE>
<CAPTION>

                                             Aggregate             Aggregate
                                            unrealized            unrealized          Net unrealized
                    Aggregate cost         appreciation          depreciation          appreciation
                    of investments        for investments       for investments       for investments
                     in securities             held                  held                  held
- ---------------------------------------------------------------------------------------------------------------------------
<S>                   <C>                  <C>                  <C>                   <C>

Balanced Fund         $35,621,691          $ 8,754,165          $ (513,811)           $  8,240,354
Bond Fund             $31,289,891          $   813,618          $   (9,734)           $    803,884
Growth Fund           $50,164,777          $14,406,169          $ (258,217)           $ 14,147,952



</TABLE>



                                       16




<PAGE>   18
                           THOMPSON PLUMB FUNDS, INC.
                              FINANCIAL HIGHLIGHTS


The following table presents information relating to a share of capital stock
outstanding for the entire period.

<TABLE>
<CAPTION>

                                                                      Year Ended November 30,
                                                      -------------------------------------------------
                                            1998(a)     1997      1996       1995        1994     1993
                                            -------     ----      ----       ----        ----     ----

   BALANCED FUND
<S>                                        <C>        <C>       <C>        <C>       <C>        <C>

NET ASSET VALUE, BEGINNING OF PERIOD       $18.16     $16.54    $14.23     $13.55    $14.17     $14.57
INCOME FROM INVESTMENT OPERATIONS
   Net investment  income                    0.09       0.18      0.19       0.24      0.27       0.28
   Net realized and unrealized gains
        on investments                       1.32       3.01      3.21       2.26      0.04       0.15
                                             ----       ----      ----       ----      ----       ----
   TOTAL FROM INVESTMENT OPERATIONS          1.41       3.19      3.40       2.50      0.31       0.43
LESS DISTRIBUTIONS
   Distributions from net investment income (0.13)     (0.23)    (0.23)     (0.28)    (0.27)     (0.28)
   Distributions from capital gains         (1.71)     (1.34)    (0.86)     (1.54)    (0.66)     (0.55)
                                            -----      -----     -----      -----     -----      ----- 
   TOTAL DISTRIBUTIONS                      (1.84)     (1.57)    (1.09)     (1.82)    (0.93)     (0.83)

NET ASSET VALUE, END OF PERIOD             $17.73     $18.16    $16.54     $14.23    $13.55     $14.17
                                           ======     ======    ======     ======    ======     ======

TOTAL RETURN                                 8.99% (b) 21.39%    25.80%     21.02%     2.15%      3.02%

RATIOS/SUPPLEMENTAL DATA
   Net assets, end of period (millions)    $44.5      $36.3     $20.8      $18.1      $17.2     $21.5
   Ratios to average net assets:
        Ratio of expenses                 1.32% (c)   1.40%     1.45%      1.49%      1.42%     1.40%
        Ratio of net investment income    1.04% (c)   1.04%     1.32%      1.71%      1.84%     1.89%
   Portfolio turnover rate               30.04% (b)  76.66%   134.82%    111.16%    110.01%    91.77%
   Average commission rate paid (d)      $0.0642    $0.0693   $0.0745         -         -          -

</TABLE>



(a) For the six month period ended May 31, 1998 (Unaudited).

(b) Calculated on a non-annualized basis.

(c) Calculated on an annualized basis.

(d) Disclosure required, effective for reporting periods beginning after
September 1, 1995.




                       See Notes to Financial Statements.

                                       17




<PAGE>   19
                           THOMPSON PLUMB FUNDS, INC.
                              FINANCIAL HIGHLIGHTS
                                   (Continued)


The following table presents information relating to a share of capital stock
outstanding for the entire period.


<TABLE>
<CAPTION>

                                                            Year Ended November 30,
                                                   ----------------------------------------------------
                                            1998(a)     1997      1996       1995        1994     1993
                                            -------     ----      ----       ----        ----     ----
<S>                                        <C>        <C>       <C>        <C>       <C>        <C>

NET ASSET VALUE, BEGINNING OF PERIOD       $10.54    $10.59     $10.67    $  9.88    $10.78     $10.33
INCOME FROM INVESTMENT OPERATIONS
   Net investment  income                    0.27      0.54       0.52       0.57      0.48       0.45
   Net realized and unrealized gains (losses)
        on investments                       0.13     (0.06)     (0.07)      0.78     (0.78)      0.44
                                             ----     -----      -----       ----     -----       ----
   TOTAL FROM INVESTMENT OPERATIONS          0.40      0.48       0.45       1.35     (0.30)      0.89
LESS DISTRIBUTIONS
   Distributions from net investment income (0.27)    (0.53)     (0.53)     (0.56)    (0.47)     (0.42)
   Distributions from capital gains            -          -         -          -      (0.13)     (0.02)
                                            -----     -----      -----      -----     -----      -----
   TOTAL DISTRIBUTIONS                      (0.27)    (0.53)     (0.53)     (0.56)    (0.60)     (0.44)

NET ASSET VALUE, END OF PERIOD             $10.67    $10.54     $10.59     $10.67   $  9.88     $10.78
                                           ======    ======     ======     ======   =======     ======

TOTAL RETURN                              3.90% (b)  4.74%      4.51%     14.06%    (2.96%)     8.74%

RATIOS/SUPPLEMENTAL DATA
   Net assets, end of period (millions)  $32.3      $32.1     $22.2      $14.9      $10.2      $6.2
   Ratios to average net assets:
      Ratio of expenses                    1.08%(c)   1.14%     1.13%      1.13%      1.00%     1.00%
      Ratio of expenses without         
       reimbursement                       1.10%(c)      -         -       1.34%      1.48%     1.76%
      Ratio of net investment income       5.32%(c)   5.42%     5.48%      5.70%      4.83%     4.44%
      Ratio of net investment income 
       without reimbursement               5.30%(c)     -          -       5.49%      4.34%     3.68%
   Portfolio turnover rate                20.27%(b)  52.61%   104.43%    111.95%    165.74%   111.18%


</TABLE>


(a) For the six month period ended May 31, 1998 (Unaudited).

(b) Calculated on a non-annualized basis.

(c) Calculated on an annualized basis.






                       See Notes to Financial Statements.

                                       18


<PAGE>   20
                           THOMPSON PLUMB FUNDS, INC.
                              FINANCIAL HIGHLIGHTS
                                   (Continued)




The following table presents information relating to a share of capital stock
outstanding for the entire period.



<TABLE>
<CAPTION>

                                                            Year Ended November 30,
                                                     --------------------------------------------------
                                            1998(a)     1997      1996       1995        1994     1993
                                            -------     ----      ----       ----        ----     ----
   GROWTH FUND
<S>                                        <C>        <C>       <C>        <C>       <C>        <C>

NET ASSET VALUE, BEGINNING OF PERIOD       $39.36    $32.79     $24.74    $20.43     $20.47     $20.37
INCOME FROM INVESTMENT OPERATIONS
   Net investment  loss                     (0.01)    (0.12)     (0.06)    (0.05)     (0.20)     (0.12)
   Net realized and unrealized gains
        on investments                       4.12      9.16       8.66      6.22       0.16       0.22
                                             ----      ----       ----      ----       ----       ----
   TOTAL FROM INVESTMENT OPERATIONS          4.11      9.04       8.60      6.17      (0.04)      0.10
LESS DISTRIBUTIONS
   Distributions 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             $40.11    $39.36     $32.79    $24.74     $20.43     $20.47
                                           ======    ======     ======    ======     ======     ======

TOTAL RETURN                             11.68% (b) 29.90%     35.52%     32.87%    (0.19%)     0.49%

RATIOS/SUPPLEMENTAL DATA
   Net assets, end of period (millions)    $64.2      $45.4     $24.1      $12.6       $4.7      $7.1
   Ratios to average net assets:
      Ratio of expenses                   1.42% (c)   1.52%     1.58%      2.00%      2.00%     1.93%
      Ratio of expenses without 
       reimbursement                         -          -          -         -        2.31%       -
      Ratio of net investment income    (0.06%) (c) (0.41%)    (0.27%)    (0.31%)   (0.49%)    (0.54%)
      Ratio of net investment income 
        without reimbursement               -           -          -          -     (0.80%)        -
   Portfolio turnover rate               25.35% (b)  77.66%   101.91%     86.68%    116.69%    98.93%
   Average commission rate paid (d)      $0.0648    $0.0734   $0.0858        -          -         -


</TABLE>


(a) For the six month period ended May 31, 1998 (Unaudited).

(b) Calculated on a non-annualized basis.

(c) Calculated on an annualized basis.

(d) Disclosure required, effective for reporting periods beginning after
September 1, 1995.






                       See Notes to Financial Statements.

                                       19


<PAGE>   21


                             DIRECTORS OF THE FUNDS
                                George H. Austin
                                Mary Ann Deibele
                                  John W. Feldt
                                Donald A. Nichols
                      Thomas G. Plumb, CFA: Vice President
                       Thompson, Plumb & Associates, Inc.
                        John W. Thompson, CFA: President
                       Thompson, Plumb & Associates, Inc.

                              OFFICERS OF THE FUNDS
                              John W. Thompson, CFA
                              Chairman & Secretary
                              Thomas G. Plumb, CFA
                              President & Treasurer
                                 David B. Duchow
                            Assistant Vice President
                              John C. Thompson, CFA
                            Assistant Vice President

                          CUSTODIAN, TRANSFER AGENT AND
                            DIVIDEND DISBURSING AGENT
                              Firstar Trust Company
                                  P. 0. Box 701
                           Milwaukee, Wisconsin 53201

                             INDEPENDENT ACCOUNTANTS
                              Price Waterhouse LLP
                              33 South Sixth Street
                          Minneapolis, Minnesota 55402

                                  LEGAL COUNSEL
                                 Quarles & Brady
                            411 East Wisconsin Avenue
                           Milwaukee, Wisconsin 53202

                               INVESTMENT ADVISOR
                       Thompson, Plumb & Associates, Inc.
                         8201 Excelsior Drive, Suite 200
                            Madison, Wisconsin 53717
                            Telephone: (608) 831-1300








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