STRONG VARIABLE INS FDS INC
N-30D, 1999-03-04
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                                   THE STRONG
                                   ----------
                                   
                                   DISCOVERY
                                    FUND II

                       =================================
                       ANNUAL REPORT o DECEMBER 31, 1998
                       =================================

                               Table of Contents

Investment Review
    The Strong Discovery Fund II ..........................................2

Financial Information
    Schedule of Investments in Securities .................................4
    Statement of Assets and Liabilities ...................................6
    Statement of Operations ...............................................7
    Statements of Changes in Net Assets ...................................8
    Notes to Financial Statements .........................................9

Financial Highlights .....................................................11

Report of Independent Accountants ........................................11

                                 
                                 [STRONG LOGO]

                            STRONG INVESTMENTS, INC.
                   P.O. Box 2936 o Milwaukee, Wisconsin 53201
             Strong Funds are offered by prospectus only. 10112L98

<PAGE>
                                    ===========
                          THE STRONG DISCOVERY FUND II
                          ----------===========-------

FUND 
 HIGHLIGHTS

o    The Strong Discovery Fund II returned 7.26% in 1998.

o    As of  December  31,  1998,  the Fund was  invested  in  companies  with an
     expected  earnings growth rate of 21.6%.  On-site  meetings with management
     confirm  that the vast  majority  of the  Fund's  holdings  are on track to
     achieve their profit targets.

o    The Fund emphasizes  dependable growth companies as a precautionary measure
     against a potential slowdown in the U.S. economy.

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

           AVERAGE ANNUAL
           TOTAL RETURNS(1)

           As of 12-31-98
         
         1-year      7.26%
         
         3-year      6.40%

         5-year      9.04%

Since Inception     11.38%
     (on 5-8-92)

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

            FIVE LARGEST
           STOCK HOLDINGS

           As of 12-31-98

SECTOR                  % OF NET ASSETS

Central Garden & Pet Co.           4.8%

Sybron International Corporation   2.6%

Equity Corporation International   2.2%

Corrections Corporation
America                            2.1%

United Stationers, Inc.            2.0%

Please see the Schedule of Investments  
in Securities for a complete listing of
the Fund's portfolio.



PERSPECTIVES
FROM THE MANAGERS


/s/ Richard S. Strong         /s/ Chip Paquelet
Richard S. Strong             Chip Paquelet
Portfolio Co-manager          Portfolio Co-manager

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

Since June 1996, there have effectively been two stock  markets--one  consisting
of a  handful  of  large,  blue-chip  companies  and the  other  containing  all
remaining stocks.  The few large-company  stocks have performed  extraordinarily
well,  significantly  exceeding historical averages. By contrast, the returns on
most  stocks  have  trailed  long-term  averages.   This  divergent  performance
accelerated in 1998, a year in which the stocks of the 50 largest companies rose
an average of 39.6%  (propelling the S&P 500 Stock Index to a 28.58% gain) while
the average stock on the New York Stock Exchange actually declined 2.9%.*

Given that the  Strong  Discovery  Fund II invests  primarily  in  smaller-  and
medium-size  companies,   an  important  benchmark  we  use  in  evaluating  our
performance is the Russell  2500(R) Index.  This index tracks the performance of
stocks  that are  most  similar  to the  types of  companies  in which  the Fund
invests.  We are pleased that the Fund's 1998 return exceeded that of this index
by 6.88%.*

While exceeding the performance of relevant benchmarks is a goal of ours, we are
disappointed by the Fund's low absolute return in 1998--particularly in light of
the financial  strength of most of the Fund's  holdings.  By our estimates,  the
companies in the portfolio are growing their earnings by an average of 21.6% per
year.  This  significantly  exceeds  the  prospects  facing  the S&P 500,  where
long-term earnings growth is estimated at 5% and the earnings report for 1998 is
likely  to show a  decline.  Additionally,  the  price  we are  paying  for this
earnings  growth,  as a multiple of  earnings,  is below the average for the S&P
500. The Fund's attractive  valuation and  earnings-growth  profile also compare
well with the Russell 2500.
                                                 -------------------------------
                                                    
                                                           DIVERGENT

                                                          PERFORMANCE

                                                          ACCELERATED

                                                            IN 1998.

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

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

1    The Fund's returns include the effect of deducting the Fund's expenses, but
     do  not  include  charges  and  expenses  attributable  to  any  particular
     insurance product. Including such insurance fees and expenses in the Fund's
     return quotations has the effect of decreasing the performance quoted.

2    Earnings  growth  has been  estimated  on an annual  basis for a  projected
     five-year period. The Discovery Fund II's earnings growth estimate has been
     generated from our own analysis of the portfolio's individual securities as
     of December 31, 1998.  The earnings  growth  projection for the S&P 500 has
     been  based on a  consensus  of  earnings  estimates  from six Wall  Street
     investment firms as shown by Bloomberg dated December 31, 1998.

2

<PAGE>

                                      P/E RATIO             ESTIMATED  
FUND                               (1998 EARNINGS)       EARNINGS GROWTH(2)  
- --------------------------------------------------------------------------------
Strong Discovery Fund II                20.7x                 21.6% 
S&P 500 Index                           26.2x                  5.0% 
Russell 2500 Index                      24.2x                 19.9%

Our investment approach is not based on chasing market euphoria or fads. Rather,
we look  for  well-managed  companies  that  are in good  businesses  and  offer
superior growth  potential--and can be invested in at attractive prices. We also
focus on companies  with products that are used and replaced  every day, such as
razor  blades  and  batteries.   By  investing  in  companies  with   consumable
characteristics,  we  attempt  to  insulate  the  portfolio  from the  impact of
economic slowdowns.

At the present  time, we believe the  portfolio is well  positioned  relative to
these attributes.  Over our respective  careers, it has been our experience that
stock prices eventually track earnings growth.  Although there is occasionally a
lapse in this relationship, it is our plan to stay the course with confidence in
our time-tested approach.

Successful  investing  requires  confidence and patience.  Yours is appreciated.
Thank you for your investment in the Strong Discovery Fund II.


                    GROWTH OF AN ASSUMED $10,000 INVESTMENT
                            From 5-8-92 to 12-31-98

                  THE STRONG                    Lipper Capital           
                  DISCOVERY      S & P 500       Appreciation     Russell
                   FUND II      Stock Index*     Funds Index*   2500(R) Index*
          
           4-92     10,000         10,000          10,000          10,000
          12-92     10,886         10,680          11,024          11,239
          12-93     13,284         11,756          12,760          12,603
          12-94     12,569         11,911          12,446          12,442
          12-95     17,000         16,387          16,379          16,616
          12-96     17,138         20,150          18,829          19,120
          12-97     19,090         26,873          22,588          21,941
          12-98     20,476         34,553          27,103          22,621


This graph,  provided in  accordance  with SEC  regulations,  compares a $10,000
investment  in the Fund,  made at its  inception,  with the  performance  of the
Standard  &  Poor's  500  Stock  Index  ("S&P  500")  and  the  Lipper   Capital
Appreciation Funds Index.  Results include the reinvestment of all dividends and
capital gains  distributions.  Performance  is historical and does not represent
future results.  Investment returns and principal value vary, and you may have a
gain or loss when you sell  shares.  To  equalize  time  periods,  the  indexes'
performance was prorated for the month of May 1992.

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

*    The S&P 500 is an  unmanaged  index  generally  representative  of the U.S.
     stock market.  The Russell  2500(R) Index is an unmanaged  index  generally
     representative  of the U.S.  stock market for small cap stocks.  The Lipper
     Capital  Appreciation Funds Index is an equally-weighted  performance index
     of the largest qualifying funds in this Lipper category.  Source of the S&P
     500 and  Russell  index data is Standard & Poor's  Micropal.  Source of the
     Lipper index data is Lipper, Inc.


YOUR FUND'S 
 APPROACH

THE STRONG  DISCOVERY FUND II SEEKS TO PROVIDE  INVESTORS WITH CAPITAL GROWTH, A
GOAL WE PURSUE BY INVESTING PRIMARILY IN SMALLER- AND MEDIUM-SIZE COMPANIES. OUR
INVESTMENT  APPROACH  COMBINES  NUMBER-CRUNCHING  ANALYSIS WITH DIRECT RESEARCH,
INCLUDING  ON-SITE  VISITS.   THROUGH  FREQUENT   DISCUSSIONS  WITH  MANAGEMENT,
SUPPLIERS,  CUSTOMERS, AND COMPETITORS, WE BELIEVE WE CAN IDENTIFY VITAL ASPECTS
OF  COMPANIES  THAT ARE NOT  REFLECTED  IN A  COMPUTER  DATABASE  OR  HISTORICAL
FINANCIAL STATEMENTS.

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

MARKET  
 HIGHLIGHTS

o    Large company stocks continue to perform well. The vast majority of stocks,
     however,  have not kept pace. In 1998,  the average New York Stock Exchange
     stock declined 2.9% and the average NASDAQ stock rose just 0.3%.

o    By many measures, the U.S. stock market's third-quarter correction exceeded
     both the 1990 bear market and the 1987 crash.  Following  the Fed's  autumn
     interest-rate  cuts,  the market  rallied and finished the year with strong
     momentum.

o    The U.S. economy has proven resilient while many economies have experienced
     recession and even depression. This global economic climate has driven many
     international  investors  to the  perceived  safety  of  America's  largest
     companies.


                                                                             3
<PAGE>

SCHEDULE OF INVESTMENTS IN SECURITIES                         DECEMBER 31, 1998
- --------------------------------------------------------------------------------
================================================================================
                            STRONG DISCOVERY FUND II
================================================================================
                                                   Shares or
                                                   Principal    Value
                                                    Amount    (Note 2)
- --------------------------------------------------------------------------------
COMMON STOCKS 89.5%
Bank - Money Center  1.2%
Citigroup, Inc.                                     46,462  $ 2,299,869

Brokerage & Investment Management  2.0%
Kansas City Southern Industries, Inc.               46,200    2,272,462
Waddell & Reed Financial, Inc. Class A              66,850    1,583,509
                                                            -----------
                                                              3,855,971
Commercial Service  12.7%
Clark/Bardes Holdings, Inc. (b)                        200        3,375
Coinmach Laundry Corporation (b)                   303,250    3,942,250
Consolidated Graphics, Inc. (b)                     40,550    2,739,659
Corrections Corporation America (b)                234,550    4,133,943
H & R Block, Inc.                                   23,625    1,063,125
ITT Educational Services, Inc. (b)                  82,900    2,818,600
Lamar Advertising Company (b)                       16,650      620,212
Modis Professional Services, Inc. (b)              182,901    2,652,064
Outdoor Systems, Inc. (b)                           90,280    2,708,400
Pittston Company Brinks Group                       46,900    1,494,938
The ServiceMaster Company                           62,025    1,368,427
Sykes Enterprises, Inc. (b)                         23,300      710,650
Valassis Communications, Inc. (b)                   10,900      562,713
                                                            -----------
                                                             24,818,356
Computer - Mainframe  1.4%
International Business Machines Corporation         15,300    2,826,675

Computer - Peripheral Equipment  2.2%
Lexmark International Group, Inc. Class A (b)       26,250    2,638,125
Security Dynamics Technologies, Inc. (b)            22,500      517,500
Storage Technology Corporation (b)                  32,600    1,159,338
                                                            -----------
                                                              4,314,963
Computer Service  1.4%
Pierce Leahy Corporation (b)                       110,550    2,819,025

Computer Software  0.5%
HBO & Company                                       37,600    1,078,650

Consumer - Miscellaneous  2.2%
Equity Corporation International (b)               165,925    4,407,383

Electric Power  0.2%
Montana Power Company                                7,600      429,875

Electronic Products - Miscellaneous  1.8%
Rayovac Corporation (b)                            128,675    3,434,014

Electronics - Semiconductor/Component  0.9%
Micron Technology, Inc. (b)                         36,450    1,843,003

Food  0.7%
Lancaster Colony Corporation                        16,900      542,912
Merkert American Corporation (b)                    59,900      905,988
                                                            -----------
                                                              1,448,900
Healthcare - Drug/Diversified 1.1%
Halsey Drug Company, Inc. (b)                      235,800      324,225
Jones Medical Industries, Inc.                      30,475    1,112,337
Warner-Lambert Company                               9,050      680,447
                                                            -----------
                                                              2,117,009
Healthcare - Instrumentation  1.0%
Datascope Corporation (b)                           30,100      692,300
Medtronic, Inc.                                     15,900    1,180,575
                                                            -----------
                                                              1,872,875

Healthcare - Medical Supply  6.7%
McKesson Corporation                                23,000    1,818,438
PSS World Medical, Inc. (b)                         48,100    1,106,300
Henry Schein, Inc. (b)                              86,818    3,885,106
Steris Corporation (b)                              42,650    1,212,859
Sybron International Corporation (b)               185,000    5,029,688
                                                            -----------
                                                             13,052,391
Healthcare - Patient Care  0.6%
Compdent Corporation (b)                           115,900    1,202,462

Healthcare - Product  0.7%
Cytyc Corporation (b)                               53,575    1,379,556

Household Appliances & Furnishings 0.8%
Newell Companies, Inc.                              39,800    1,641,750

Insurance - Life  0.4%
Protective Life Corporation                          9,742      387,853
The MONY Group, Inc. (b)                            14,600      457,163
                                                            -----------
                                                                845,016
Insurance - Property & Casualty   1.7%
American Bankers Insurance Group, Inc.              68,250    3,301,594

Leisure Product  2.7%
Action Performance Companies, Inc. (b)              64,475    2,280,803
Harley-Davidson, Inc.                               22,550    1,068,306
SCP Pool Corporation (b)                           128,237    1,939,585
                                                            -----------
                                                              5,288,694
Leisure Service  2.0%
Bally Total Fitness Holding Corporation (b)         87,150    2,167,856
International Game Technology                       68,925    1,675,739
                                                            -----------
                                                              3,843,595
Machine Tool  1.1%
Applied Power, Inc.                                 55,675    2,101,731

Media - Publishing  0.6%
School Specialty, Inc. (b)                          52,100    1,113,638

Media - Radio/TV   6.3%
Chancellor Media Corporation (b)                    81,050    3,880,269
Clear Channel Communications, Inc. (b)              44,806    2,441,927
Infinity Broadcasting Corporation (b)               32,300      884,213
Tele-Communications, Inc. TCI Group Series A (b)    40,300    2,229,094
Viacom International, Inc. (b)                      39,975    2,958,150
                                                            -----------
                                                             12,393,653
Office Automation   1.2%
Xerox Corporation                                   19,175    2,262,650

Oil Well Equipment & Service  0.4%
Noble Drilling Corporation (b)                      66,600      861,638

Personal & Commercial Lending  3.5%
Associates First Capital Corporation                73,950    3,133,631
Household International, Inc.                       92,900    3,681,162
                                                            -----------
                                                              6,814,793
Pollution Control   3.7%
Republic Services, Inc. Class A (b)                 65,100    1,200,281
Superior Services, Inc. (b)                        154,150    3,092,634
Waste Management, Inc.                              64,635    3,013,607
                                                            -----------
                                                              7,306,522

4
<PAGE>

- --------------------------------------------------------------------------------
================================================================================
                      STRONG DISCOVERY FUND II (CONTINUED)
================================================================================

                                                   Shares or
                                                   Principal    Value
                                                    Amount     (Note 2)
- --------------------------------------------------------------------------------
Railroad  1.0%
Burlington Northern Santa Fe Corporation            61,000 $  2,058,750

Real Estate   1.6%
CCA Prison Realty Trust                             29,100      596,550
Sunstone Hotel Investors, Inc.                     260,400    2,457,525
                                                             ----------
                                                              3,054,075
Retail - Drug Store   0.3%
Rite Aid Corporation                                10,200      505,538

Retail - Food Chain  0.4%
US Foodservice (b)                                  15,175      743,575

Retail - Restaurant  2.2%
PJ America, Inc. (b)                                63,400    1,149,125
Papa John's International, Inc. (b)                 40,725    1,796,991
Rainforest Cafe, Inc. (b)                          220,000    1,333,750
                                                             ----------
                                                              4,279,866
Retail - Specialty   16.3%
Black Box Corporation (b)                           58,500    2,215,687
Central Garden & Pet Company (b)                   651,375    9,363,516
Global Imaging Systems, Inc. (b)                   101,000    2,449,250
Lowe's Companies, Inc.                              15,450      790,847
MSC Industrial Direct Company, Inc. Class A (b)     72,125    1,631,828
Movie Gallery, Inc. (b)                            279,475    1,991,259
Office Depot, Inc. (b)                              85,000    3,139,688
Pier 1 Imports, Inc.                                86,100      834,094
Regis Corporation                                   41,000    1,640,000
Renters Choice, Inc. (b)                            81,925    2,601,119
United Stationers, Inc. (b)                        154,200    4,009,200
Wilmar Industries, Inc. (b)                         68,800    1,397,500
                                                             ----------
                                                             32,063,988
Savings & Loan   1.0%
Dime Bancorp, Inc.                                  17,600      465,300
TCF Financial Corporation                           65,325    1,580,048
                                                             ----------
                                                              2,045,348
Telecommunication Equipment  1.1%
American Tower Corporation Class A (b)              56,850    1,680,628
Aware, Inc. (b)                                     18,400      500,250
                                                             ----------
                                                              2,180,878
Telecommunication Service  2.1%
Davel Communications, Inc. (b)                     144,925    2,644,881
MCI WorldCom, Inc. (b)                              20,000    1,435,000
                                                             ----------
                                                              4,079,881
Tobacco  1.1%
Philip Morris Companies, Inc.                       39,925    2,135,988

Transportation Service   0.7%
Hub Group, Inc. Class A (b)                         74,475    1,442,953
- -----------------------------------------------------------------------
TOTAL COMMON STOCKS (Cost $165,851,602)                     175,567,091
- -----------------------------------------------------------------------

PREFERRED STOCKS   0.6%
News Corporation, Ltd. Sponsored ADR                50,900    1,256,594
- -----------------------------------------------------------------------
TOTAL PREFERRED STOCKS (Cost $1,254,821)                      1,256,594
- -----------------------------------------------------------------------

SHORT-TERM INVESTMENTS (A) 4.4%
COMMERCIAL PAPER 0.5%
Interest Bearing, Due Upon Demand
American Family Financial Services, Inc., 
  5.17%                                         $      100          100
Pitney Bowes Credit Corporation, 5.23%             522,500      522,500
Sara Lee Corporation, 5.23%                        303,100      303,100
Wisconsin Corporate Central Credit Union, 5.30%    138,000      138,000
                                                             ----------
                                                                963,700
REPURCHASE AGREEMENT 3.5%
Goldman Sachs Group LP (Dated 12/31/98), 4.55%,
  Due 1/04/99 (Repurchase proceeds $6,803,438);
  Collateralized by: $5,400,000 United States
  Treasury Bonds, 10.00%, Due 5/15/10 (Market
  Value $6,941,700) (d)                          6,800,000    6,800,000
UNITED STATES GOVERNMENT ISSUES 0.4%
United States Treasury Bills,
  Due 3/04/99 thru 4/01/99 (c)                     740,000      732,832
- -----------------------------------------------------------------------
TOTAL SHORT-TERM INVESTMENTS (Cost $8,496,463)                8,496,532
- -----------------------------------------------------------------------
- -----------------------------------------------------------------------
TOTAL INVESTMENTS IN SECURITIES (Cost $175,602,886) 94.5%   185,320,217
Other Assets and Liabilities, Net 5.5%                       10,852,312
- -----------------------------------------------------------------------
NET ASSETS 100.0%                                          $196,172,529
=======================================================================


FUTURES
- --------------------------------------------------------------------------------
                                       Underlying
                        Expiration     Face Amount     Unrealized
    Contracts              Date         at Value      Appreciation
- --------------------------------------------------------------------------------
Purchased:
  21 Russell 2000          3/99       $ 4,465,125      $123,607
  44 S&P 500               3/99        13,700,500        99,548




WRITTEN OPTIONS ACTIVITY
- --------------------------------------------------------------------------------
                                                  Contracts     Premiums
- --------------------------------------------------------------------------------
Options outstanding at beginning of period            --        $     --
Options written during the period                    198         504,289
Options closed                                      (198)       (504,289)
Options expired                                       --              --
Options exercised                                     --              --
                                                  ---------------------- 
Options outstanding at end of period                  --        $     --
                                                  ======================

Closed options resulted in a capital gain of $142,345.



LEGEND
- --------------------------------------------------------------------------------
(a)  Short-term  investments  include any security  which has a maturity of less
     than one year.
(b)  Non-income producing security.
(c)  All or a portion of  security  pledged  to cover  margin  requirements  for
     future contracts.
(d)  See Note 2(I) of Notes to Financial Statements.

Percentages are stated as a percent of net assets.

See Notes to Financial Statements.



                                                                             5

<PAGE>

STATEMENT OF ASSETS AND LIABILITIES
- --------------------------------------------------------------------------------
December 31, 1998

                                                             Strong Discovery
                                                                 Fund II
                                                             ----------------
ASSETS:
  Investments in Securities, at Value (Cost of $175,602,886)   $185,320,217
  Receivable for Securities Sold                                 12,281,846
  Dividends and Interest Receivable                                  70,746
  Other Assets                                                       82,352
                                                               ------------
  Total Assets                                                  197,755,161

LIABILITIES:
  Payable for Securities Purchased                                1,532,698
  Accrued Operating Expenses and Other Liabilities                   49,934
                                                               ------------
  Total Liabilities                                               1,582,632
                                                               ------------
NET ASSETS                                                     $196,172,529
                                                               ============

NET ASSETS CONSIST OF:
  Capital Stock (par value and paid-in capital)                $167,210,968
  Undistributed Net Realized Gain                                19,021,075
  Net Unrealized Appreciation                                     9,940,486
                                                               ------------
  Net Assets                                                   $196,172,529
                                                               ============

Capital Shares Outstanding (Unlimited Number Authorized)         15,418,542

NET ASSET VALUE PER SHARE                                            $12.72
                                                                     ======


                       See Notes to Financial Statements.

6
<PAGE>

STATEMENT OF OPERATIONS
- --------------------------------------------------------------------------------
For the Year Ended December 31, 1998

                                                         Strong Discovery
                                                             Fund II
                                                         ----------------
INCOME:
  Dividends                                                $   863,036
  Interest                                                     890,019
                                                           -----------
  Total Income                                               1,753,055

EXPENSES:
  Investment Advisory Fees                                   1,988,031
  Custodian Fees                                                64,386
  Shareholder Servicing Costs                                  266,920
  Other                                                         25,197
                                                           -----------
  Total Expenses                                             2,344,534
                                                           -----------
NET INVESTMENT LOSS                                           (591,479)

REALIZED AND UNREALIZED GAIN (LOSS):
  Net Realized Gain (Loss) on:                                  
    Investments                                             25,936,829   
    Futures Contracts and Options                           (3,191,483)
                                                           ----------- 
    Net Realized Gain                                       22,745,346
  Change in Unrealized Appreciation/Depreciation on:
    Investments                                             (8,861,607)
    Futures Contracts                                          223,155
                                                           -----------
    Net Change in Unrealized Appreciation/Depreciation      (8,638,452)
                                                           ----------- 
NET GAIN ON INVESTMENTS                                     14,106,894
                                                           -----------

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS       $13,515,415
                                                           ===========



                       See Notes to Financial Statements.

                                                                             7
<PAGE>
<TABLE>

STATEMENTS OF CHANGES IN NET ASSETS
- ----------------------------------------------------------------------------------------------------
<CAPTION>
                                                             Strong Discovery Fund II
                                                       ---------------------------------------
                                                         Year Ended              Year Ended
                                                        Dec. 31, 1998           Dec. 31, 1997
                                                        -------------           -------------
<S>                                                     <C>                      <C>    
OPERATIONS:
  Net Investment Loss                                   ($    591,479)           ($  1,512,488)
  Net Realized Gain                                        22,745,346               18,148,062
  Net Change in Unrealized Appreciation/Depreciation       (8,638,452)               6,534,581
                                                         ------------             ------------
  Net Increase in Net Assets Resulting from Operations     13,515,415               23,170,155

DISTRIBUTIONS:
  From Net Realized Gains                                  (3,179,809)                      --

CAPITAL SHARE TRANSACTIONS:
  Proceeds from Shares Sold                                71,710,705              111,653,915
  Proceeds from Reinvestment of Distributions               3,178,862                       -- 
  Payment for Shares Redeemed                            (102,946,444)            (150,342,369)
                                                         ------------             ------------ 
  Net Decrease in Net Assets from Capital Share Transact  (28,056,877)             (38,688,454)
                                                         ------------             ------------ 
TOTAL DECREASE IN NET ASSETS                              (17,721,271)             (15,518,299)
                                                         
NET ASSETS:
  Beginning of Year                                       213,893,800              229,412,099
                                                         ------------             ------------
  End of Year                                            $196,172,529             $213,893,800
                                                         ============             ============

TRANSACTIONS IN SHARES OF THE FUND:
  Sold                                                      5,844,176                9,567,132
  Issued in Reinvestment of Distributions                     241,739                       -- 
  Redeemed                                                 (8,445,910)             (13,026,043)
                                                         ------------             ------------ 
  Net Decrease in Shares of the Fund                       (2,359,995)              (3,458,911)
                                                         ============             ============ 

</TABLE>

                                   See Notes to Financial Statements.

8
<PAGE>

NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
December 31, 1998

1.   ORGANIZATION
     The Strong  Discovery  Fund II is a diversified  series of Strong  Variable
     Insurance Funds, Inc., an open-end management investment company registered
     under the  Investment  Company  Act of 1940.  The Fund offers and sells its
     shares only to separate accounts of insurance  companies for the purpose of
     funding variable annuity and variable life insurance contracts. At December
     31, 1998, approximately 96% of the Fund's shares are owned by one insurance
     company.

2.   SIGNIFICANT ACCOUNTING POLICIES
     The following is a summary of significant  accounting  policies followed by
     the Fund in the preparation of its financial statements.

     (A)  Security  Valuation  --  Portfolio  securities  traded  primarily on a
          principal  securities  exchange are valued at the last reported  sales
          price or the mean of the  latest  bid and asked  prices  where no last
          sales  price is  available.  Securities  traded  over-the-counter  are
          valued  at the mean of the  latest  bid and  asked  prices or the last
          reported  sales  price.  Debt  securities  not  traded on a  principal
          securities  exchange are valued  through  valuations  obtained  from a
          commercial  pricing  service,  otherwise  last sale or bid  prices are
          used. Securities for which market quotations are not readily available
          are  valued  at  fair  value  as   determined   in  good  faith  under
          consistently  applied procedures  established by and under the general
          supervision of the Board of Directors.  Securities which are purchased
          within 60 days of their stated  maturity are valued at amortized cost,
          which approximates fair value.

          The Fund may own certain investment securities which are restricted as
          to resale.  These securities are valued after giving due consideration
          to  pertinent   factors,   including  recent  private  sales,   market
          conditions and the issuer's financial performance.  The Fund generally
          bears the costs, if any, associated with the disposition of restricted
          securities.  The Fund held no  restricted  securities  at December 31,
          1998.

     (B)  Federal Income and Excise Taxes and  Distributions  to Shareholders --
          The Fund  intends  to comply  with the  requirements  of the  Internal
          Revenue Code  applicable  to  regulated  investment  companies  and to
          distribute substantially all of its taxable income to its shareholders
          in a manner which  results in no tax cost to the Fund.  Therefore,  no
          federal income or excise tax provision is required.

          The  character  of  distributions   made  during  the  year  from  net
          investment   income  or  net  realized   gains  may  differ  from  the
          characterization for federal income tax purposes due to differences in
          the  recognition  of income and expense items for financial  statement
          and tax purposes.  Where  appropriate,  reclassifications  between net
          asset  accounts are made for such  differences  that are  permanent in
          nature.

     (C)  Realized  Gains and  Losses  on  Investment  Transactions  -- Gains or
          losses  realized  on  investment  transactions  are  determined  on  a
          first-in, first-out basis.

     (D)  Certain   Investment   Risks  --  The  Fund  may  utilize   derivative
          instruments  including  options,  futures and other  instruments  with
          similar  characteristics  to the extent that they are consistent  with
          the Fund's investment objectives and limitations.  The Fund intends to
          use such  derivative  instruments  primarily  to hedge or protect from
          adverse  movements in securities  prices or interest rates. The use of
          these  instruments  may  involve  risks  such  as the  possibility  of
          illiquid  markets or  imperfect  correlation  between the value of the
          instruments and the underlying  securities,  or that the  counterparty
          will fail to perform its obligations.

          Foreign  denominated assets and forward currency contracts may involve
          greater  risks  than  domestic   transactions,   including   currency,
          political and economic, regulatory and market risks.

     (E)  Futures -- Upon entering into a futures contract,  the Fund pledges to
          the broker cash or other  investments  equal to the  minimum  "initial
          margin"  requirements of the exchange.  Additional  securities held by
          the Fund may be designated  as  collateral on open futures  contracts.
          The Fund also  receives  from or pays to the  broker an amount of cash
          equal to the  daily  fluctuation  in the value of the  contract.  Such
          receipts or payments are known as "variation  margin" and are recorded
          as unrealized gains or losses.  When the futures contract is closed, a
          realized gain or loss is recorded equal to the difference  between the
          value of the  contract  at the time it was opened and the value at the
          time it was closed.

     (F)  Options -- The Fund may write put or call options.  Premiums  received
          by the Fund upon  writing put or call options are recorded as an asset
          with a corresponding  liability which is subsequently  adjusted to the
          current  market  value  of the  option.  When an  option  expires,  is
          exercised,  or is closed,  the Fund  realizes a gain or loss,  and the
          liability  is  eliminated.  The  Fund  continues  to bear  the risk of
          adverse  movements  in the price of the  underlying  asset  during the
          period of the option,  although any  potential  loss during the period
          would be reduced by the amount of the option premium received.

     (G)  Foreign Currency Translation -- Investment securities and other assets
          and  liabilities   initially   expressed  in  foreign  currencies  are
          converted to U.S. dollars based upon current exchange rates. Purchases
          and sales of foreign investment securities and income are converted to
          U.S.  dollars based upon  currency  exchange  rates  prevailing on the
          respective

                                                                             9
<PAGE>

NOTES TO FINANCIAL STATEMENTS (continued)
- --------------------------------------------------------------------------------
December 31, 1998

          dates of such transactions.  The effect of changes in foreign exchange
          rates on realized and unrealized security gains or losses is reflected
          as a component of such gains or losses.

     (H)  Forward  Foreign  Currency  Exchange   Contracts  --  Forward  foreign
          currency  exchange  contracts  are valued at the forward  rate and are
          marked-to-market  daily.  The change in market value is recorded as an
          unrealized gain or loss. When the contract is closed, the Fund records
          an exchange gain or loss equal to the difference  between the value of
          the  contract  at the time it was  opened and the value at the time it
          was closed.

     (I)  Repurchase Agreements -- The Fund may enter into repurchase agreements
          with institutions that the Fund's investment  advisor,  Strong Capital
          Management,  Inc. ("the  Advisor"),  has  determined are  creditworthy
          pursuant  to  criteria  adopted  by  the  Board  of  Directors.   Each
          repurchase  agreement is recorded at cost.  The Fund requires that the
          collateral,  represented  by  securities  (primarily  U.S.  Government
          securities),  purchased in a repurchase transaction be maintained in a
          segregated  account with a custodian in a manner  sufficient to enable
          the Fund to obtain those  securities  in the event of a default of the
          issuer of the  repurchase  agreement.  On a daily  basis,  the Advisor
          monitors  each  repurchase  agreement  to  ensure  the  value  of  the
          collateral,  including  accrued  interest,  is at  least  equal to the
          amount owed to the Fund under each repurchase agreement.

     (J)  Use of  Estimates  --  The  preparation  of  financial  statements  in
          conformity  with generally  accepted  accounting  principles  requires
          management to make estimates and assumptions  that affect the reported
          amounts in these  financial  statements.  Actual  results could differ
          from those estimates.

     (K)  Other -- Investment security transactions are recorded as of the trade
          date.  Dividend income and  distributions to shareholders are recorded
          on the  ex-dividend  date.  Interest income is recorded on the accrual
          basis and includes amortization of premium and discounts.

3.   RELATED PARTY TRANSACTIONS
     The  Advisor,  with whom  certain  officers  and  directors of the Fund are
     affiliated,   provides   investment   advisory   services  and  shareholder
     recordkeeping and related services to the Fund.  Investment  advisory fees,
     which are established by terms of the Advisory  Agreement,  are based on an
     annualized rate of 1.00% of the average daily net assets of the Fund. Based
     on the terms of the Advisory  Agreement,  advisory fees and other  expenses
     will be waived by the Advisor if the Fund's operating expenses exceed 2% of
     the average daily net assets of the Fund. In addition,  the Fund's  Advisor
     may voluntarily  waive certain  expenses at their  discretion.  Shareholder
     recordkeeping  and related  service fees are based on the lesser of various
     agreed-upon  contractual percentages of the average daily net assets of the
     Fund or a contractually established rate for each participant account.

     The Fund may invest  cash  reserves in money  market  funds  sponsored  and
     managed by the Advisor,  subject to certain limitations.  The terms of such
     transactions are identical to those of non-related entities except that, to
     avoid  duplicate  investment  advisory fees,  advisory fees of the Fund are
     reduced by an amount equal to advisory  fees paid to the Advisor  under its
     investment advisory agreement with the money market funds.

     The  amount  payable to the  Advisor  at  December  31,  1998,  shareholder
     servicing  and  other  expenses  paid  to  the  Advisor,  and  unaffiliated
     directors' fees for the year then ended, were $24,017, $352,996 and $3,576,
     respectively.

4.   LINE OF CREDIT
     The Strong Funds have established a line of credit  agreement  ("LOC") with
     certain  financial  institutions  to be used  for  temporary  or  emergency
     purposes,  primarily for financing redemption payments. Combined borrowings
     among all  participating  Strong Funds are subject to a $350 million cap on
     the total line of credit.  For individual  Funds,  borrowings under the LOC
     are  limited to either  the lesser of 15% of the market  value of total net
     assets  or  any  explicit   borrowing  limits  in  the  Fund's  prospectus.
     Borrowings under the LOC bear interest based on prevailing  market rates as
     defined in the LOC. A  commitment  fee of .07% per annum is incurred on the
     unused portion of the line of credit and is allocated to all  participating
     Strong Funds.  At December 31, 1998,  there were no borrowings by the Funds
     outstanding under the LOC.

5.   INVESTMENT TRANSACTIONS
     The  aggregate  purchases  and sales of long-term  securities  for the year
     ended December 31, 1998 were $350,146,456 and $386,867,545, respectively.

6.   INCOME TAX INFORMATION
     At December 31, 1998,  the cost of  investments  in securities  for federal
     income tax  purposes  was  $179,339,231.  Net  unrealized  appreciation  of
     securities was $5,980,986,  consisting of gross unrealized appreciation and
     depreciation of $21,806,588 and $15,825,602, respectively.

     During the year  ended  December  31,  1998,  the Fund paid a capital  gain
     distribution (taxable as long-term capital gains at 20%) to shareholders of
     $1,680,441 (unaudited).

10
<PAGE>
<TABLE>

FINANCIAL HIGHLIGHTS
- ----------------------------------------------------------------------------------------------------------------
STRONG DISCOVERY FUND II
- -----------------------------------------------------------------------------------------------------------
<CAPTION>
                                                                                 Year Ended 
                                                                 ------------------------------------------
<S>                                                              <C>      <C>      <C>      <C>     <C> 
SELECTED PER-SHARE DATA(a)                                        1998     1997     1996     1995    1994
- -----------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period                             $12.03   $10.80   $13.44   $10.07  $11.54
Income From Investment Operations
  Net Investment Income (Loss)                                    (0.04)   (0.09)   (0.05)   (0.03)   0.10
  Net Realized and Unrealized Gains (Losses) on Investments        0.92     1.32     0.04     3.58   (0.71)
  ---------------------------------------------------------------------------------------------------------
  Total from Investment Operations                                 0.88     1.23    (0.01)    3.55   (0.61)

Less Distributions
  From Net Investment Income                                         --       --       --       --   (0.10)
  In Excess of Net Investment Income                                 --       --    (1.05)   (0.18)  (0.43)
  From Net Realized Gains                                         (0.19)      --    (1.58)      --   (0.33)
  ---------------------------------------------------------------------------------------------------------
  Total Distributions                                             (0.19)      --    (2.63)   (0.18)  (0.86)
- -----------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                                   $12.72   $12.03   $10.80   $13.44  $10.07
===========================================================================================================

RATIOS AND SUPPLEMENTAL DATA
- -----------------------------------------------------------------------------------------------------------
Total Return                                                      +7.3%   +11.4%    +0.8%   +35.3%   -5.4%
Net Assets, End of Period (In Millions)                            $196     $214     $229     $245    $119
Ratio of Expenses to Average Net Assets                            1.2%     1.2%     1.2%     1.3%    1.2%
Ratio of Net Investment Income (Loss) to Average Net Assets       (0.3%)   (0.7%)   (0.3%)   (0.3%)   1.1%
Portfolio Turnover Rate                                          194.0%   198.1%   970.0%   542.1%  662.5%

</TABLE>

(a)  Information  presented  relates  to a share  of  capital  stock of the Fund
     outstanding for the entire period.



See Notes to Financial Statements.





REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
To the Board of Directors of the Strong Variable  Insurance Funds,  Inc. and the
Shareholders of the Strong Discovery Fund II

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material  respects,  the  financial  position of Strong  Discovery  Fund II (the
"Fund") (one of the portfolios constituting the Strong Variable Insurance Funds,
Inc.) at December  31,  1998,  the results of its  operations  for the year then
ended,  the  changes  in its net  assets for each of the two years in the period
then ended and the financial  highlights for each of the periods  indicated,  in
conformity  with  generally  accepted  accounting  principles.  These  financial
statements  and  financial  highlights  (hereafter  referred  to  as  "financial
statements") are the responsibility of the Fund's management; our responsibility
is to express an opinion on these financial  statements based on our audits.  We
conducted our audits of these financial  statements in accordance with generally
accepted auditing  standards which require that we plan and perform the audit to
obtain reasonable  assurance about whether the financial  statements are free of
material  misstatement.  An audit includes examining,  on a test basis, evidence
supporting the amounts and  disclosures in the financial  statements,  assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall  financial  statement  presentation.  We believe that our
audits, which included  confirmation of securities owned at December 31, 1998 by
correspondence  with the custodian,  provide a reasonable  basis for the opinion
expressed above.

PricewaterhouseCoopers LLP

Milwaukee, Wisconsin
February 1, 1999


                                                                            11


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