NML VARIABLE ANNUITY ACCOUNT B
N-4/A, 2000-06-15
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<PAGE>   1
                                                      Registration No. 333-33232



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-4

                   REGISTRATION STATEMENT UNDER THE SECURITIES
                                   ACT OF 1933                   / /

                          Pre-Effective Amendment No. 1          /X/
                                                     ---
                          Post-Effective Amendment No.           / /
                                                      ---
                                     and/or

                   REGISTRATION STATEMENT UNDER THE INVESTMENT
                               COMPANY ACT OF 1940               / /

                                Amendment No. 26                 /X/

                        (Check appropriate box or boxes.)

                         NML VARIABLE ANNUITY ACCOUNT B
--------------------------------------------------------------------------------
                           (Exact Name of Registrant)
                 THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
--------------------------------------------------------------------------------
                               (Name of Depositor)
720 East Wisconsin Avenue, Milwaukee, Wisconsin                          53202
----------------------------------------------------------------------  ------
         (Address of Depositor's Principal Executive Offices)         (Zip Code)

Depositor's Telephone Number, including Area Code  414-271-1444
                                                   ------------
              ROBERT J. BERDAN, Vice President and General Counsel
             720 East Wisconsin Avenue, Milwaukee, Wisconsin  53202
--------------------------------------------------------------------------------
                     (Name and Address of Agent for Service)



          Approximate date of proposed public offering: June 30, 2000.

Title of Securities Being Registered:  MASON STREET VARIABLE ANNUITY

It is proposed that this filing will become effective (check appropriate space)

     immediately upon filing pursuant to paragraph (b) of Rule 485
----
     on (Date) pursuant to paragraph (b) of Rule 485
----
     60 days after filing pursuant to paragraph (a)(1) of Rule 485
----
     on (DATE) pursuant to paragraph (a)(1) of Rule 485
----

     this post-effective amendment designates a new effective date for a
---- previously filed post-effective amendment.


         IF ANY OF THE SECURITIES BEING REGISTERED ON THIS FORM ARE TO BE
OFFERED ON A DELAYED OR CONTINUOUS BASIS PURSUANT TO RULE 415 UNDER THE
SECURITIES ACT OF 1933 CHECK THE FOLLOWING BOX |_|

The registrant hereby amends this registration statement on such date or dates
as may be necessary to delay its effective date until the registrant shall file
a further amendment which specifically states that this registration statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the registration statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.




<PAGE>   2


                         NML VARIABLE ANNUITY ACCOUNT B
--------------------------------------------------------------------------------

                              CROSS-REFERENCE SHEET
<TABLE>
<CAPTION>

N-4, Part A                                                  Heading in
Item                                                         Prospectus
-----------                                                  ----------
<S>                                                          <C>

     1  .....................................................Cover Page
     2  .....................................................Index of Special Terms
     3  .....................................................Expense Table
     4  .....................................................Accumulation Unit Values, Performance Data,
                                                             Financial Statements
     5  .....................................................The Company, NML Variable Annuity Account B, The
                                                             Funds, Voting Rights
     6  .....................................................Deductions, Distribution of the Contracts
     7  .....................................................The Contracts, Owners of the Contracts, Application
                                                             of Purchase Payments, Transfers Between Divisions
                                                             and Payment Plans, Substitution and Change
     8  .....................................................Variable Payment Plans, Description of Payment
                                                             Plans, Amount of Annuity Payments, Maturity
                                                             Benefit, Assumed Investment Rate, Transfers Between
                                                             Divisions and Payment Plans
     9  .....................................................Death Benefit
     10 .....................................................Amount and Frequency, Application of Purchase
                                                             Payments, Net Investment Factor, Distribution of
                                                             the Contracts
     11 .....................................................Withdrawal Amount, Deferment of Benefit Payments,
                                                             Right to Examine Contract
     12 .....................................................Federal Income Taxes
     13 .....................................................Not Applicable
     14 .....................................................Table of Contents for Statement of Additional
                                                             Information


<CAPTION>

N-4, Part B                                                  Heading in Statement
Item                                                         of Additional Information
-----------                                                  -------------------------
<S>                                                          <C>
    15 ......................................................Cover Page
    16 ......................................................Table of Contents
    17 ......................................................Not Applicable
    18 ......................................................Experts
    19 ......................................................Not Applicable
    20 ......................................................Distribution of the Contracts
    21 ......................................................Performance Data
    22 ......................................................Determination of Annuity Payments
    23 ......................................................Financial Statements

</TABLE>






<PAGE>   3

JUNE 30, 2000




MASON STREET VARIABLE ANNUITY



Nontax - Qualified Annuities
Individual Retirement Annuities
Roth IRAs






                                     (PHOTO)













NORTHWESTERN MUTUAL                         The Northwestern Mutual Life
SERIES FUND, INC. AND                       Insurance Company
RUSSELL INSURANCE FUNDS                     720 East Wisconsin Avenue
                                            Milwaukee, Wisconsin 53202
                                            (414) 271-1444






                              P R O S P E C T U S E S



                                                         NORTHWESTERN MUTUAL(TM)
<PAGE>   4
NORTHWESTERN MUTUAL               The Northwestern Mutual Life Insurance Company
                      PROFILE                Mason Street Variable Annuity


                                                                   June 30, 2000


PROFILE OF THE MASON STREET VARIABLE ANNUITY CONTRACT

This Profile is a summary of some of the more important points that you should
consider and know before purchasing the Contract. We describe the Contract more
fully in the prospectus which accompanies this Profile. Please read the
prospectus carefully.

1. THE ANNUITY CONTRACT The Contract provides a means for you, the owner, to
invest on a tax-deferred basis in your choice of sixteen investment portfolios.
The Contract also allows investment on a fixed basis in a guaranteed account.
The Contract is issued by The Northwestern Mutual Life Insurance Company.

The Contract is intended for retirement savings or other long-term investment
purposes. The Contract provides for a death benefit during the years when funds
are being accumulated and for a variety of income options following retirement.
The sixteen investment portfolios are listed in Section 4 below. These
portfolios bear varying amounts of investment risk. Those with more risk are
designed to produce a better long-term return than those with less risk. But
this is not guaranteed. You can also lose your money.

The amounts you invest on a fixed basis earn interest at a rate we declare from
time to time. We guarantee principal and we guarantee the interest rate for each
amount for at least one year.

You may invest in any or all of the sixteen investment portfolios. You may move
money among these portfolios without charge up to 12 times per year. After that,
a charge of $25 may apply. Transfers of amounts invested on a fixed basis are
subject to restrictions. During the years when funds are being paid into your
Contract, known as the accumulation phase, the earnings accumulate on a
tax-deferred basis. The earnings are taxed as income if you make a withdrawal.
The income phase begins when you start receiving annuity payments from your
Contract, usually at retirement. Monthly annuity payments begin on the date you
select. The amount you accumulate in your Contract, including the results of
investment performance, will determine the amount of your monthly annuity
payments.

2. ANNUITY PAYMENTS If you decide to begin receiving monthly annuity payments
from your Contract, you may choose one of three payment plans: (1) monthly
payments for a specified period of five to thirty years, as you select; (2)
monthly payments for your life (assuming you are the annuitant), and you may
choose to have payments continue to your beneficiary for the balance of ten or
twenty years if you die sooner; or (3) monthly payments for your life and for
the life of another person (usually your spouse) selected by you. After you
begin receiving monthly annuity payments you cannot change your selection if the
payments depend on your life or the life of another. These payment plans are
available to you on a variable or fixed basis. Variable means that the amount
accumulated in your Contract will continue to be invested in one or more of the
sixteen investment portfolios as you choose. Your monthly annuity payments will
vary up or down to reflect continuing investment performance. Or you may choose
a fixed annuity payment plan which guarantees the amount you will receive each
month.

3. PURCHASE The minimum initial purchase payment is $50,000. Your Northwestern
Mutual financial representative will help you complete a Contract application
form. 4. INVESTMENT CHOICES You may invest in any or all of the following
investment portfolios. All of these are described in the attached prospectuses
for Northwestern Mutual Series Fund, Inc. and the Russell Insurance Funds.

Northwestern Mutual Series Fund, Inc.
     1.  Small Cap Growth Stock Portfolio
     2.  Aggressive Growth Stock Portfolio
     3.  International Equity Portfolio
     4.  Index 400 Stock Portfolio
     5.  Growth Stock Portfolio
     6.  Growth and Income Stock Portfolio
     7.  Index 500 Stock Portfolio
     8.  Balanced Portfolio
     9.  High Yield Bond Portfolio
     10. Select Bond Portfolio
     11. Money Market Portfolio
Russell Insurance Funds, Inc.
     1.  Multi-Style Equity Fund
     2.  Aggressive Equity Fund
     3.  Non-U.S. Fund
     4.  Real Estate Securities Fund
     5.  Core Bond Fund

You may also invest all or part of your funds on a fixed basis (the Guaranteed
Interest Fund).

5. EXPENSES The Contract has insurance and investment features, and there are
costs related to them. Each year we deduct a $30 Contract fee. Currently this
fee is waived if the value of your Contract is $25,000 or more.


                                  PROFILE - i




<PAGE>   5
NORTHWESTERN MUTUAL               The Northwestern Mutual Life Insurance Company
                      PROFILE                Mason Street Variable Annuity




We also deduct mortality and expense risk charges for the guarantees associated
with your Contract. These charges are at the annual rate of 0.35%. We may
increase these charges to a maximum rate of 0.75%. We will not increase the
charges for at least five years from the date of the prospectus.

The portfolios also bear investment charges that range from an annual rate of
0.20% to 1.30% of the average daily value of the portfolio, depending on the
investment portfolio you select. The following charts are designed to help you
understand the charges for Contract. The first three columns show the annual
expenses as a percentage of assets including the insurance charges, the
portfolio charges and the total charges. Portfolio expenses are based on 1999
expenses for the portfolios. Expenses for the portfolios reflect fee waivers and
expense reimbursements. The last two columns show you examples of the charges,
in dollars, you would pay. The examples reflect the impact of the asset based
charges and the $30 Contract fee calculated by dividing the annual Contract fees
collected by the average assets of the sub-account. The examples assume that you
invested $1,000 in a Contract which earns 5% annually and that you withdraw your
money at the end of year one, and at the end of year ten. Both of these
examples, for both Contracts, reflect aggregate charges on a cumulative basis to
the end of the 1 or 10-year period.

We do not make any changes for sales expenses. Your Northwestern Mutual agent
who offers the contract represents a broker-dealer or a registered investment
adviser. You will pay the broker-dealer a fee in lieu of sales commissions or
you will pay a fee for investment advisory services. In either case your
Northwestern Mutual agent will disclose the fees to you and receive a portion of
the fees you pay.

For more detailed information, see the Expense Table which begins on page 3 of
the attached prospectus for the Contracts.


<TABLE>
<CAPTION>



                                                            EXPENSES
----------------------------------------------------------------------------------------------------------------------------

                                            ANNUAL EXPENSES AS A PERCENTAGE OF ASSETS
                                                                                            EXAMPLES: *
                                                                                            Total Annual Charges At End of
                                             Total Annual          Total      Total Annual
Portfolio                                 Insurance Charges*       Annual      Expenses*
                                                                 Portfolio                  1 Year            10 Years
                                                                  Charges
----------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>                      <C>         <C>            <C>               <C>
Northwestern Mutual Series Fund, Inc.
  Small Cap Growth Stock                0.35% (0.30% + 0.05%)       1.00%         1.35%            $14              $190
  Aggressive Growth Stock               0.35% (0.30% + 0.05%)       0.51%         0.86%             $9              $132
  International Equity                  0.35% (0.30% + 0.05%)       0.74%         1.09%            $11              $159
  Index 400 Stock                       0.35% (0.30% + 0.05%)       0.35%         0.70%             $7              $126
  Growth Stock                          0.35% (0.30% + 0.05%)       0.43%         0.78%             $8              $123
  Growth and Income Stock               0.35% (0.30% + 0.05%)       0.57%         0.92%             $9              $139
  Index 500 Stock                       0.35% (0.30% + 0.05%)       0.20%         0.55%             $6              $96
  Balanced                              0.35% (0.30% + 0.05%)       0.30%         0.65%             $7              $108
  High Yield Bond                       0.35% (0.30% + 0.05%)       0.50%         0.85%             $9              $131
  Select Bond                           0.35% (0.30% + 0.05%)       0.30%         0.65%             $7              $108
  Money Market                          0.35% (0.30% + 0.05%)       0.30%         0.65%             $7              $108
Russell Insurance Funds, Inc.
  Multi-Style Equity                    0.35% (0.30% + 0.05%)       0.92%         1.27%            $13              $183
  Aggressive Equity                     0.35% (0.30% + 0.05%)       1.25%         1.60%            $16              $223
  Non-U.S.                              0.35% (0.30% + 0.05%)       1.30%         1.65%            $17              $239
  Real Estate Securities                0.35% (0.30% + 0.05%)       1.15%         1.50%            $15              $204
  Core Bond                             0.35% (0.30% + 0.05%)       0.80%         1.15%            $12              $172
----------------------------------------------------------------------------------------------------------------------------
</TABLE>


  *THE $30 CONTRACT FEE IS REFLECTED AS 0.00% OF THE ASSETS BASED ON ACTUAL FEES
  COLLECTED DIVIDED BY AVERAGE ASSETS OF THE SUB-ACCOUNT. WE MAY INCREASE THE
  INSURANCE CHARGES TO A MAXIMUM RATE OF 0.75%. WE WILL NOT INCREASE THE CHARGES
  FOR AT LEAST FIVE YEARS FROM THE DATE OF THE PROSPECTUS.

  NOTE: THE MINIMUM INITIAL PURCHASE PAYMENT FOR A CONTRACT IS $50,000. THE
  NUMBERS ABOVE MUST BE MULTIPLIED BY 50 TO FIND THE EXPENSES FOR A CONTRACT OF
  MINIMUM SIZE.


6. TAXES A Contract may be issued as an individual retirement annuity (IRA),
Roth IRA, or nontax-qualified annuity. The Contracts will be subject to certain
contribution limits and/or other requirements depending on their tax
classification. For Roth IRAs and nontax-qualified annuities, purchase payments
are not excluded from income, while for individual retirement annuities (IRAs)
they are excluded from income. In all cases, earnings on your





                                  PROFILE - ii

<PAGE>   6


NORTHWESTERN MUTUAL               The Northwestern Mutual Life Insurance Company
                      PROFILE                Mason Street Variable Annuity



Contract are not taxed as they accrue. If the Contract is purchased as an
individual retirement annuity (IRA), the entire amount of monthly annuity
payments, and any withdrawals, will generally be taxed as income. If the
Contract is purchased as a ROTH IRA, certain distributions after 5 years will be
tax-free. Finally, if the Contract is purchased as a nonqualified annuity,
amounts withdrawn prior to the income phase will be taxed as income to the
extent of earnings. During the income phase, monthly annuity payments will be
considered partly a return of your investment which is not taxed and partly a
distribution of earnings which is taxed as income. In all cases, a 10% federal
penalty tax may apply if you make taxable withdrawals from the Contract before
you reach age 59 1/2.

7. ACCESS TO YOUR MONEY You may take money out of your Contract at any time
before monthly annuity payments begin. You may have to pay income tax and a tax
penalty on amounts you take out.


8. PERFORMANCE The value of your Contract will vary up or down reflecting the
performance of the investment portfolios you select. The chart below shows total
returns for each of the investment portfolios that was in operation, and used
with NML Variable Annuity Account B, during the years shown. Performance is not
shown for the portfolios that have not been in operation for one calendar year.
These numbers reflect the asset-based charges for mortality and expense risks,
the annual Contract fees and investment expenses for each portfolio. The numbers
include the annual Contract fee in the amount of 0.00%. The Contracts described
in this prospectus have not been issued prior to the date of this prospectus,
but the performance numbers have been calculated based on the actual performance
of the investment portfolios and the expense charges for the Contracts. Past
performance does not guarantee future results.

<TABLE>
<CAPTION>


                                                         PERFORMANCE
----------------------------------------------------------------------------------------------------------------------------


                                                                     CALENDAR YEAR
PORTFOLIO                     1999     1998      1997      1996     1995      1994      1993     1992      1991      1990
----------------------------------------------------------------------------------------------------------------------------
Northwestern Mutual Series
--------------------------
Fund, Inc.
----------
<S>                           <C>       <C>      <C>       <C>     <C>         <C>      <C>      <C>       <C>      <C>
  Aggressive Growth Stock     43.78%    7.09     13.37     17.19   38.70       4.95     18.60    5.49      55.07      NA
  International Equity        22.90%    4.37     11.80     20.49   14.08       -.53        NA      NA         NA      NA
  Growth Stock                22.49%   26.15     29.30     20.38   30.26         NA        NA      NA         NA      NA
  Growth and Income Stock      7.48%   22.61     29.47     19.45   30.56         NA        NA      NA         NA      NA
  Index 500 Stock             20.91%   28.17     32.63     22.22   36.66        .76      9.29    6.80      29.00      NA
  Balanced                    11.20%   18.37     20.99     12.96   25.85       -.45      9.11    4.87      23.40     .61
  High Yield Bond             -0.46%   -2.27     15.35     19.25   16.28         NA        NA      NA         NA      NA
  Select Bond                 -1.02%    6.61      8.99      2.87   18.59      -3.25      9.86    6.53      16.37    7.86
  Money Market                 5.10%    4.97      5.02      4.83    5.37       3.61      2.41    2.90       5.24    7.57
</TABLE>


9. DEATH BENEFIT If you die before age 75, and before monthly annuity payments
begin, your beneficiary will receive a death benefit. The amount will be the
value of your Contract or, if greater, the amount you have paid in. We offer an
enhanced death benefit at extra cost. We increase the enhanced death benefit on
each Contract anniversary, up to age 80, if the Contract value has increased.
The death benefit will be adjusted, of course, for any purchase payments or
withdrawals you have made. The death benefit may be paid as a lump sum, or your
beneficiary may select a monthly annuity payment plan, or the Contract may be
continued in force with a contingent annuitant.

10.  OTHER INFORMATION

FREE LOOK. If you return the Contract within ten days after you receive it (or
whatever period is required in your state), we will send your money back. There
is no charge for our expenses but the amount you receive may be more or less
than what you paid, based on actual investment experience following the date we
received your purchase payment.

AVOID PROBATE. In most cases, when you die, your beneficiary will receive the
full death benefit of your Contract without going through probate.

AUTOMATIC DOLLAR-COST AVERAGING. With our Dollar-Cost Averaging Plan, you can
arrange to have a regular amount of money ($100 minimum) automatically
transferred from the Money Market Portfolio into the portfolio or portfolios you
have chosen on a monthly or quarterly basis.

ELECTRONIC FUNDS TRANSFER (EFT). Another convenient way to invest using the
dollar-cost averaging approach is through our EFT Plan. These automatic
checkbook withdrawals allow you to add to your portfolio(s) on a regular monthly
basis through payments drawn directly on your checking account.

SYSTEMATIC WITHDRAWAL PLAN. You can arrange to have regular amounts of money
sent to you while your Contract is


                                 PROFILE - iii

<PAGE>   7
NORTHWESTERN MUTUAL               The Northwestern Mutual Life Insurance Company
                      PROFILE                Mason Street Variable Annuity


still in the accumulation phase. Our Systematic Withdrawal Plan allows you to
automatically redeem accumulation units to generate monthly payments. Of course
you may have to pay taxes on amounts you receive.

AUTOMATIC REQUIRED MINIMUM DISTRIBUTIONS. For IRAs, you can arrange for annual
required minimum distributions to be sent to you automatically once you turn age
70 1/2.

PORTFOLIO REBALANCING. To help you maintain your asset allocation plan over time
we offer a rebalancing service. This will automatically readjust your current
investment option allocations, on a periodic basis, back to the allocation
percentages you have selected.

INTEREST SWEEPS. If you select this service we will automatically sweep or
transfer interest from the Guaranteed Interest Fund to any combination of
variable investment options. Interest earnings can be swept monthly, quarterly,
semi-annually or annually.

NML EXPRESS. 1-800-519-4NML (1-800-519-4665). Get up-to-date information about
your contract at your convenience with your contract number and your Personal


Identification Number (PIN). Call toll-free to review contract values and unit
values, transfer among portfolios, change the allocation and obtain fund
performance information.

INTERNET. For information about Northwestern Mutual, visit us on our Website.
Included are daily unit values, fund performance information and access to
current values for Contracts you own.

                           WWW.NORTHWESTERNMUTUAL.COM

THESE FEATURES MAY NOT BE AVAILABLE IN ALL STATES AND MAY NOT BE SUITABLE FOR
YOUR PARTICULAR SITUATION.

11. INQUIRIES If you need more information, please contact us at:

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY, 720 EAST WISCONSIN AVENUE,
MILWAUKEE, WISCONSIN 53202; 1-888-455-2232.



                                  PROFILE - iv
<PAGE>   8





P R O S P E C T U S

MASON STREET VARIABLE ANNUITY


This prospectus describes an individual variable annuity contract (the
"Contract") offered by The Northwestern Mutual Life Insurance Company
("Northwestern Mutual").

We offer the Contract for use in these situations:

-        Traditional Individual Retirement Annuities (IRAs).

-        Roth IRAs.

-        Other situations that do not qualify for special tax treatment.

We use NML Variable Annuity Account B (the "Account") to keep the money you
invest separate from our general assets. The money in the Account is invested in
the eleven portfolios of Northwestern Mutual Series Fund, Inc. and the five
Russell Insurance Funds. You select the Portfolios or Funds in which you want to
invest. Northwestern Mutual Series Fund, Inc.: Small Cap Growth Stock,
Aggressive Growth Stock, International Equity, Index 400 Stock, Growth Stock,
Growth and Income Stock, Index 500 Stock, Balanced, High Yield Bond, Select
Bond, Money Market. Russell Insurance Funds: Multi-Style Equity, Aggressive
Equity, Non-U.S., Real Estate Securities, Core Bond.

The Account has 16 Divisions that correspond to the 11 Portfolios and 5 Funds in
which you may invest. The Contract also permits you to invest on a fixed basis,
at rates that we determine. This prospectus describes only


the Account and the variable provisions of the Contract except where there are
specific references to the fixed provisions.

 This prospectus is a concise description of the information you should know
before you buy a Contract. We have filed additional information about the
Contract with the Securities and Exchange Commission in a Statement of
Additional Information. We incorporate the Statement of Additional Information
into this prospectus by reference. We will send you the Statement of Additional
Information without charge if you write to The Northwestern Mutual Life
Insurance Company, 720 East Wisconsin Avenue, Milwaukee, Wisconsin, 53202, or
call us at Telephone Number (414) 271-1444. You will find the table of contents
for the Statement of Additional Information following page 14 of this
prospectus.

This prospectus is valid only when accompanied by the current prospectuses for
Northwestern Mutual Series Fund, Inc. and Russell Insurance Funds which are
attached to this prospectus. You should retain this prospectus for future
reference.

The Securities and Exchange Commission has not approved or disapproved these
securities or passed upon the adequacy of this prospectus. Any representation to
the contrary is a criminal offense.


The date of this prospectus and the Statement of Additional Information is June
30, 2000.




                                       1


<PAGE>   9


CONTENTS FOR THIS PROSPECTUS


<TABLE>
<CAPTION>

                                              PAGE                                                                     PAGE
                                              ----                                                                     ----

<S>                                          <C>                          <C>                                          <C>
PROSPECTUS......................................1                               Substitution and Change...................9
  Mason Street Variable Annuity.................1                               Fixed Annuity Payment Plans...............9
INDEX OF SPECIAL TERMS..........................3                               Performance Data..........................9
EXPENSE TABLE...................................3                               Financial Statements.....................10
THE COMPANY.....................................4                         THE GUARANTEED INTEREST FUND...................10
NML VARIABLE ANNUITY                                                      FEDERAL INCOME TAXES...........................11
   ACCOUNT B....................................5                             Qualified and Nontax-Qualified Plans.......11
THE FUNDS.......................................5                             Contribution Limitations and General
THE CONTRACT....................................5                              Requirements Applicable to Contract.......11
    Purchase Payments Under the Contract........5                               Traditional IRA..........................11
      Amount and Frequency......................5                               Roth IRA.................................11
      Application of Purchase Payments..........5                               Nontax-qualified Contract................11
    Net Investment Factor.......................6                             Taxation of Contract Benefits..............11
    Benefits Provided Under the Contract........6                               IRAs,....................................11
      Withdrawal Amount.........................6                               Roth IRAs................................11
      Death Benefit.............................6                               Nonqualified Contracts...................12
      Maturity Benefit..........................7                               Premature Withdrawals....................12
    Variable Payment Plans......................7                               Minimum Distribution Requirements........12
      Description of Payment Plans..............7                             Taxation of Northwestern Mutual............13
      Amount of Annuity Payments................8                             Other Considerations.......................13
      Assumed Investment Rate...................8                         DEDUCTIONS.....................................13
    Additional Information......................8                         Mortality Rate and Expense Risk Charges........13
      Transfers Between Divisions and                                           Contract Fee.............................13
        Payment Plans...........................8                               Enhanced Death Benefit Charge............13
      Owners of the Contract....................9                               Premium Taxes............................14
Deferment of Benefit Payments...................9                               Expenses for the Portfolios and Funds....14
      Dividends.................................9                         DISTRIBUTION OF THE CONTRACT...................14
      Voting Rights.............................9
</TABLE>




        THE TABLE OF CONTENTS FOR THE STATEMENT OF ADDITIONAL INFORMATION
           APPEARS ON THE PAGE FOLLOWING PAGE 14 OF THIS PROSPECTUS.




                                       2
<PAGE>   10
INDEX OF SPECIAL TERMS

The following special terms used in this prospectus are discussed at the pages
indicated.

<TABLE>
<CAPTION>
TERM                                               PAGE    TERM                                             PAGE
----                                               ----    ----                                             ----
<S>                                                <C>     <C>                                              <C>
ACCUMULATION UNIT....................................5     ANNUITANT..........................................7
ANNUITY (or ANNUITY PAYMENTS)........................6     MATURITY DATE......................................6
NET INVESTMENT FACTOR................................6     OWNER..............................................7
PAYMENT PLANS........................................7     WITHDRAWAL AMOUNT..................................6
</TABLE>
--------------------------------------------------------------------------------
EXPENSE TABLE

<TABLE>
<CAPTION>

TRANSACTION EXPENSES FOR CONTRACTOWNERS
---------------------------------------
<S>                                                          <C>
Maximum Sales Load (as a percentage
of purchase payments)..........................None          ANNUAL CONTRACT FEE
                                                             -------------------
Withdrawal Charge..............................None          $30; waived if the Contract Value equals or exceeds
                                                             $25,000
ANNUAL EXPENSES OF THE ACCOUNT
 (AS A PERCENTAGE OF ASSETS)
Current Mortality and Expense Risk Fees*.......0.35%
Maximum Mortality and Expense Risk
   Fees*.......................................0.75%
Other Expenses*................................None
Total Current Separate Account Annual
   Expenses*...................................0.35%
Total Maximum Separate Account Annual
   Expenses*...................................0.75%
</TABLE>

*WE GUARANTEE THE CURRENT MORTALITY AND EXPENSE RISK FEES FOR FIVE YEARS FROM
THE DATE OF THIS PROSPECTUS. THEREAFTER, WE RESERVE THE RIGHT TO INCREASE THE
MORTALITY AND EXPENSE RISK FEES TO A MAXIMUM ANNUAL RATE OF 0.75%.


ANNUAL EXPENSES OF THE PORTFOLIOS AND FUNDS
(AS A PERCENTAGE OF THE ASSETS)


<TABLE>
<CAPTION>

                                                          MANAGEMENT                       TOTAL ANNUAL EXPENSES
                                                          FEES (AFTER         OTHER           (AFTER EXPENSE
                                                         FEE WAIVER)        EXPENSES           REIMBURSEMENT)
                                                         -----------        --------           --------------

<S>                                                      <C>                <C>            <C>
Northwestern Mutual Series Fund, Inc.
   Small Cap Growth Stock*                                   0.79%            0.21%                1.00%
   Aggressive Growth Stock                                   0.51%            0.00%                0.51%
   International Equity                                      0.67%            0.07%                0.74%
   Index 400 Stock*                                          0.25%            0.10%                0.35%
   Growth Stock                                              0.43%            0.00%                0.43%
   Growth and Income Stock                                   0.57%            0.00%                0.57%
   Index 500 Stock                                           0.20%            0.00%                0.20%
   Balanced                                                  0.30%            0.00%                0.30%
   High Yield Bond                                           0.49%            0.01%                0.50%
   Select Bond                                               0.30%            0.00%                0.30%
   Money Market                                              0.30%            0.00%                0.30%
Russell Insurance Funds, Inc.*
   Multi-Style Equity                                        0.77%            0.15%                0.92%
   Aggressive Equity                                         0.86%            0.39%                1.25%
   Non-U.S.                                                  0.75%            0.55%                1.30%
   Real Estate Securities                                    0.85%            0.30%                1.15%
   Core Bond                                                 0.54%            0.26%                0.80%
</TABLE>




-------------------
* For the Russell Insurance Funds (the "Fund"), the Small Cap Growth Stock
Portfolio and the Index 400 Stock Portfolio (the "Portfolios"), the adviser has
voluntarily agreed to waive a portion of the management fee, up to the full
amount of the fee, equal to the amount by which the Fund's and Portfolios' total
operating expenses exceed the amounts shown above under "Total Annual Expenses
(After Expense Reimbursement)". The adviser has also agreed to reimburse the
Fund and Portfolios for all remaining expenses after fee waivers which exceed
the amounts shown above under that heading. Absent the fee waiver and expense
reimbursement, the management fees and total annual expenses would be 0.78% and
0.93% for the Multi-Style Equity Fund; 0.95% and 1.34% for the Aggressive Equity
Fund; 0.95% and 1.50% for the Non-U.S. Fund; 0.85% and 1.15% for the Real Estate
Securities Fund; 0.60% and 0.86% for the Core Bond Fund; 0.79% and 1.03% for the
Small Cap Growth Stock Portfolio; and 0.25% and 0.46% for the Index 400 Stock
Portfolio.



                                       3


<PAGE>   11


EXAMPLE

You would pay the following expenses on each $1,000 investment, assuming 5%
annual return:

<TABLE>
<CAPTION>

                                              1 YEAR               3 YEARS              5 YEARS             10 YEARS
                                              ------               ------               -------             --------
<S>                                           <C>                  <C>                  <C>                 <C>
Northwestern Mutual Series Fund, Inc.
   Small Cap Growth Stock                       $14                  $43                  $75                 $190
   Aggressive Growth Stock                      $9                   $27                  $48                 $132
   International Equity                         $11                  $35                  $60                 $159
   Index 400 Stock                              $7                   $25                  $44                 $126
   Growth Stock                                 $8                   $25                  $43                 $123
   Growth and Income Stock                      $9                   $29                  $51                 $139
   Index 500 Stock                              $6                   $18                  $31                  $96
   Balanced                                     $7                   $21                  $36                 $108
   High Yield Bond                              $9                   $27                  $47                 $131
   Select Bond                                  $7                   $21                  $36                 $108
   Money Market                                 $7                   $21                  $36                 $108
Russell Insurance Funds, Inc.
   Multi-Style Equity                           $13                  $41                  $71                 $183
   Aggressive Equity                            $16                  $52                  $91                 $223
   Non-U.S.                                     $17                  $56                  $98                 $239
   Real Estate Securities                       $15                  $47                  $82                 $204
   Core Bond                                    $12                  $38                  $66                 $172
</TABLE>



NOTE: THE MINIMUM INITIAL PURCHASE PAYMENT FOR A CONTRACT IS $50,000. YOU MUST
MULTIPLY THE NUMBERS ABOVE BY 50 TO FIND THE EXPENSES FOR A CONTRACT OF MINIMUM
SIZE.


The purpose of the table above is to assist a Contract Owner in understanding
the expenses paid by the Account and the Portfolios and Funds and borne by
investors in the Contracts. We guarantee the current mortality and expense risk
charges for five years from the date of this prospectus. Thereafter, we reserve
the right to increase the mortality and expense risk charges to a maximum annual
rate of 0.75%. The $30 annual Contract fee is reflected as 0.00% based on
estimated annual contract fees we will collect divided by the estimated
corresponding average assets of the Division. The Contract provides for charges
for transfers between the Divisions of the Account and for premium taxes, but we
are not currently making such charges. See "Transfers Between Divisions and
Payment Plans", p. 8 and "Deductions", p. 13, for additional information about
expenses for the Contract. The expenses shown in the table for the Portfolios
and Funds show the annual expenses for each, as a percentage of their average
net assets, based on 1999 operations for the Portfolios and their predecessors
and the Funds. Expenses for each of the Russell Insurance Funds, and for the
Small Cap Growth Stock Portfolio and the Index 400 Stock Portfolio, reflect fee
waivers and expense reimbursements that the advisers have voluntarily agreed to
make for the year 2000. These may be changed at any time thereafter without
notice. Absent the fee waivers and expense reimbursements the expenses would be
higher. See the disclosure at the bottom of page 3.


The example should not be considered a representation of past or future
expenses. Actual expenses may be greater or less than those shown, subject to
the guarantees of the Contract.

--------------------------------------------------------------------------------
THE COMPANY

The Northwestern Mutual Life Insurance Company was organized by a special act of
the Wisconsin Legislature in 1857. It is the nation's fifth largest life
insurance company, based on total assets in excess of $85 billion on December
31, 1999, and is licensed to conduct a conventional life insurance business in
the District of Columbia and in all states of the United States. Northwestern
Mutual sells life and disability income insurance policies and annuity contracts
through its own field force of approximately 6,000 full time financial
representatives. The Home Office of Northwestern Mutual is located at 720 East
Wisconsin Avenue, Milwaukee, Wisconsin 53202.

"We" in this prospectus means Northwestern Mutual.



                                       4
<PAGE>   12
NML VARIABLE ANNUITY ACCOUNT B


We established the Account on February 14, 1968 by action of our Board of
Trustees in accordance with the provisions of the Wisconsin insurance law. The
Account is registered with the Securities and Exchange Commission as a unit
investment trust under the Investment Company Act of 1940.

The Account has sixteen Divisions. The money you invest to provide variable
benefits under your Contract is placed in one or more of the Divisions as you
direct.

Under Wisconsin law, the investment operations of the Account are kept separate
from our other operations. The values for your Contract will not be affected by
income, gains or losses for the rest of our business. The income, gains or
losses, realized or unrealized, for the assets we place in the Account for your
Contract will determine the value of your Contract benefits and will not affect
the rest of our business. The assets in the Account are reserved for you and
other Contract owners, although the assets belong to us and we do not hold the
assets as a trustee. We and our creditors cannot reach those assets to satisfy
other obligations until our obligations under your Contract have been satisfied.
But all of our assets (except those we hold in some other separate accounts) are
available to satisfy our obligations under your Contract.

--------------------------------------------------------------------------------
THE FUNDS

Northwestern Mutual Series Fund, Inc. is composed of eleven separate portfolios
which operate as separate mutual funds. The portfolios are the Small Cap Growth
Stock Portfolio, Aggressive Growth Stock Portfolio, International Equity
Portfolio, Index 400 Stock Portfolio, Growth Stock Portfolio, Growth and Income
Stock Portfolio, Index 500 Stock Portfolio, Balanced Portfolio, High Yield Bond
Portfolio, Select Bond Portfolio and Money Market Portfolio. The Account buys
shares of each Portfolio at net asset value, that is, without any sales charge.

Northwestern Mutual Investment Services, LLC ("NMIS"), our wholly-owned
subsidiary, is the investment adviser to the Fund. We provide the people and
facilities that NMIS uses in performing its investment advisory functions, and
we are a party to the investment advisory agreement. We and NMIS also perform
certain administrative functions and act as co-depositors of the Account. NMIS
has retained J.P. Morgan Investment Management, Inc. and Templeton Investment
Counsel, Inc. under investment sub-advisory agreements to provide investment
advice to the Growth and Income Stock Portfolio and the International Equity
Portfolio.

The Russell Insurance Funds include five separate portfolios which operate as
separate mutual funds. These are the Multi-Style Equity Fund, Aggressive Equity
Fund, Non-U.S. Fund, Real Estate Securities Fund and Core Bond Fund. The Account
buys shares of each of the Russell Insurance Funds at net asset value, that is,
without any sales charge.


--------------------------------------------------------------------------------
THE CONTRACT

PURCHASE PAYMENTS UNDER THE CONTRACT

AMOUNT AND FREQUENCY A purchase payment is the money you give us to pay for your
Contract. You may make purchase payments monthly, quarterly, semiannually,
annually or on any other frequency acceptable to us.

The minimum initial purchase payment is $50,000. The minimum amount for each
subsequent purchase payment is $25. Minimum amounts for payments by
preauthorized check depend on payment frequency. We will accept larger purchase
payments than due, or payments at other times, but total purchase payments under
any Contract may not exceed $5,000,000 without our consent.

Purchase payments may not exceed the applicable federal income tax limits. (See
"Federal Income Taxes", p. 11.)

APPLICATION OF PURCHASE PAYMENTS We credit your purchase payments, less any
premium taxes for which we make a deduction, to the Account and allocate them to
one or more Divisions as you direct. We then invest those assets in shares of
the Portfolio or Fund which corresponds to that Division.

We apply purchase payments to provide "Accumulation Units" in one or more
Divisions. Accumulation Units represent your interest in the Account. The number
of Accumulation Units you receive for each purchase payment is determined by
dividing the amount of the purchase payment to be allocated to a Division by the
value of an Accumulation Unit in that Division, based upon the next valuation of
the assets of the Division we make after we receive your purchase payment at our
Home Office. Receipt of purchase payments at a lockbox facility we have
designated will be considered the same as receipt at the Home Office. We value
assets as of the close of trading on the New York Stock Exchange for each day
the Exchange is open, and at any other time required by the Investment Company
Act of 1940.

The number of your Accumulation Units will be increased by additional purchase
payments or transfers

                                       5

<PAGE>   13
into the Account and decreased by withdrawals or transfers out of the Account.
The investment experience of the Account does not change the number (as
distinguished from the value) of your Accumulation Units.

The value of an Accumulation Unit in each Division varies with the investment
experience of the Division (which in turn is determined by the investment
experience of the corresponding Portfolio or Fund). We determine the value by
multiplying the value on the immediately preceding valuation date by the net
investment factor for the Division. The net investment factor takes into account
the investment experience of the Portfolio or Fund, the deduction for mortality
and expense risks we have assumed and a deduction for any applicable taxes or
for any expenses resulting from a substitution of securities. (See "Net
Investment Factor", below.) Since you bear the investment risk, there is no
guarantee as to the aggregate value of your Accumulation Units. That value may
be less than, equal to, or more than the cumulative net purchase payments you
have made.

You may direct all or part of a purchase payment to the Guaranteed Interest
Fund. Amounts you direct to the Guaranteed Interest Fund will be invested on a
fixed basis. See "The Guaranteed Interest Fund", p. 10.

NET INVESTMENT FACTOR

For each Division the net investment factor for any period ending on a valuation
date is 1.000000 plus the net investment rate for the Division for that period.
Under the Contract the net investment rate is related to the assets of the
Division. However, since all amounts are simultaneously invested in shares of
the corresponding Portfolio or Fund when allocated to the Division, calculation
of the net investment rate for each of the Divisions may also be based upon the
change in value of a single share of the corresponding Portfolio or Fund.

Thus, for example, in the case of the Balanced Division the net investment rate
is equal to (a) the change in the net asset value of a Balanced Portfolio share
for the period from the immediately preceding valuation date up to and including
the current valuation date, plus the per share amount of any dividends and other
distributions made by the Balanced Portfolio during the valuation period, less a
deduction for any applicable taxes or for any expenses resulting from a
substitution of securities, (b) divided by the net asset value of a Balanced
Portfolio share on the valuation date immediately preceding the current
valuation date, (c) less an adjustment to provide for the deduction for
mortality rate and expense risks that we have assumed. (See "Deductions", p.
13.)

The Portfolios and Funds will distribute investment income and realized capital
gains to the Account Divisions. We will reinvest those distributions in
additional shares of the same Portfolio or Fund. Unrealized capital gains and
realized and unrealized capital losses will be reflected by changes in the value
of the shares held by the Account.

BENEFITS PROVIDED UNDER THE CONTRACT

The benefits provided under the Contract consist of a withdrawal amount, a death
benefit and a maturity benefit. Subject to the restrictions noted below, we will
pay all of these benefits in a lump sum or under the payment plans described
below.

WITHDRAWAL AMOUNT On or prior to the maturity date you are entitled to withdraw
the Accumulation Units credited to your Contract and receive the value thereof.
The value, which may be either greater or less than the amount you paid is based
on the Accumulation Unit value next determined after we receive your written
request for withdrawal on a form we provide. The forms are available from our
Home Office and our agents. You may withdraw a portion of the Accumulation Units
on the same basis, except that we will not grant a partial withdrawal which
would result in a Contract value of less than $2000 remaining; we will treat a
request for such a partial withdrawal as a request to surrender the entire
Contract. Amounts distributed to you upon withdrawal of all or a portion of
Accumulation Units may be subject to federal income tax. (See "Federal Income
Taxes", p. 11.) A penalty tax will apply to premature payments of Contract
benefits. A penalty tax of 10% of the amount of the payment which is includible
in income will be imposed on non-exempt withdrawals. Payments which are exempt
from the penalty tax include payments upon disability, after age 59-1/2, for
certain large medical expenses and for reimbursement of certain health insurance
premiums and certain substantially equal periodic payments for life. Required
minimum distributions must be taken from your IRA, after you attain age 70 1/2
or, in certain cases, retire. (See "Minimum Distribution Requirements", p.
12).

If annuity payments are being made under Payment Plan 1 the payee may surrender
the Contract and receive the value of the Annuity Units credited to his
Contract. Upon death during the certain period of the payee under Plan 2 or both
payees under Plan 3, the beneficiary may surrender the Contract and receive the
withdrawal value of the unpaid payments for the certain period. The withdrawal
value is based on the Annuity Unit value on the withdrawal date, with the unpaid
payments discounted at the Assumed Investment Rate. (See "Description of Payment
Plans", p. 7.)

DEATH BENEFIT

1. Amount of the Death Benefit. If the Annuitant dies before the maturity date,
the death benefit will not be less than the Contract value next determined after
we receive proof of death at our Home Office. If the Primary Annuitant dies
before his or her 75th birthday, the death benefit, where permitted by state
law, will not be less than the amount of purchase payments we received, less
withdrawals. There is no death benefit

                                       6
<PAGE>   14


after annuity payments begin. See "Maturity Benefit" and "Variable Payment
Plans" below.

An enhanced death benefit is available at extra cost. Prior to the first
Contract anniversary the enhanced death benefit is equal to the total purchase
payments received less any amounts withdrawn. On any Contract anniversary prior
to the Primary Annuitants 80th birthday, the enhanced death benefit is the
Contract value on that date, but not less than what the enhanced death benefit
was on the last preceding valuation date. On any other valuation date before the
Primary Annuitant's 80th birthday, the enhanced death benefit will be the amount
determined on the most recent Contract anniversary, plus purchase payments we
receive thereafter, less withdrawals. On any valuation date on or after the
Primary Annuitant's 80th birthday the enhanced death benefit will be the
enhanced death benefit on the Contract anniversary immediately prior to the
Primary Annuitant's 80th birthday increased by purchase payments we received and
decreased by any amounts withdrawn after that Contract anniversary. We deduct
the extra cost for the enhanced death benefit from the Contract value on each
Contract anniversary while the enhanced death benefit is in effect. See
"Enhanced Death Benefit Charge", p. 13. The enhanced death benefit is available
for issue ages up to 65 and must be elected when the Contract is issued. The
enhanced death benefit will remain in effect until the maturity date or the
death of the Primary Annuitant or you ask us to remove it from your Contract.
You cannot add it to your Contract again after it has been removed.

2. Distribution of the Death Benefit.

Owner is the Annuitant. If the Owner is the Annuitant and the Owner dies before
the maturity date, the beneficiary becomes entitled to the death benefit. The
beneficiary may elect to receive the death benefit in a lump sum or under a
variable payment plan. The beneficiary automatically becomes the new Owner and
Annuitant and the Contract continues in force. The beneficiary must take
distributions from the Contract pursuant to the applicable minimum distribution
requirements discussed on page 12.

Owner is not the Annuitant. If the Owner is not the Annuitant and the Annuitant
dies before the maturity date, the Contingent Annuitant automatically becomes
the new Annuitant and the Contract continues in force. If no Contingent
Annuitant is named within 60 days after we receive proof of death of the
Annuitant, we pay the death benefit to the Owner.

Adjustment of Contract Value. On the date when the death benefit becomes
payable, if the Contract continues in force we will set the Contract value at an
amount equal to the death benefit.

MATURITY BENEFIT Purchase payments under the Contract are payable until the
maturity date specified in the Contract. You may select any date up to age 90 as
the maturity date, subject to applicable tax and state law requirements,
including the minimum distribution requirements (See "Minimum Distribution
Requirements", p. 12). On the maturity date, if you have not elected any other
permissible payment plan, we will change the maturity date to the Contract
anniversary nearest the Annuitant's 90th birthday. On that date, if you have not
elected any other permissible payment plan, we will pay the value of the
Contract in monthly payments for life under a variable payment plan with
payments certain for ten years.

VARIABLE PAYMENT PLANS

We will pay part or all of the benefits under a Contract under a variable
payment plan you select. The payment plan starts on the maturity date. See
"Maturity Benefit", above. Under a variable plan, you bear the entire investment
risk, since we make no guarantees of investment return. Accordingly, there is no
guarantee of the amount of the variable payments, and you must expect the amount
of such payments to change from month to month.

For a discussion of tax considerations and limitations regarding the election of
payment plans, see "Federal Income Taxes", p. 11.

DESCRIPTION OF PAYMENT PLANS The following payment plans are available:

1. Payments for a Certain Period. An annuity payable monthly for a specified
period of 10 to 30 years during the first five Contract years and over a
specified period of 5 to 30 years beginning with the sixth Contract year.

2. Life Annuity with or without Certain Period. An annuity payable monthly until
the payee's death, or until the expiration of a selected certain period,
whichever is later. After the payee's death during the certain period, if any,
we will make payments as they come due to the designated contingent beneficiary.
You may select a certain period of either 10 or 20 years, or you may choose a
plan with no certain period.

3. Joint and Survivor Life Annuity with Certain Period. An annuity payable
monthly for a certain period of 10 years and thereafter to two persons for their
joint lives. On the death of either payee, payments continue for the remainder
of the 10 years certain or the remaining lifetime of the survivor, whichever is
longer.

We may limit the election of a payment plan to one that results in an initial
payment of at least $50. A payment plan will continue even if payments fall to
less than $50 after the payment plan begins.

From time to time we may establish payment plan rates with greater actuarial
value than those stated in the Contract and make them available at the time of
settlement. We may also make available other payment plans, with provisions and
rates we publish for those plans.

                                       7
<PAGE>   15

AMOUNT OF ANNUITY PAYMENTS We will determine the amount of the first annuity
payment on the basis of the particular payment plan you select, the annuity
payment rate and, for plans involving life contingencies, the Annuitant's
adjusted age and sex. (A Contract with annuity payment rates that are not based
on sex is also available.) We will calculate the amount of the first annuity
payment on a basis that takes into account the length of time over which we
expect annuity payments to continue. The first payment will be lower for an
Annuitant who is younger when payments begin, and higher for an Annuitant who is
older, if the payment plan involves life contingencies. The first payment will
be lower if the payment plan includes a longer certain period. Variable annuity
payments after the first will vary from month to month to reflect the
fluctuating value of the Annuity Units credited to your Contract. Annuity Units
represent the interest of the Contract in each Division of the Account after
annuity payments begin.

ASSUMED INVESTMENT RATE The variable annuity rate tables for the Contract are
based upon an Assumed Investment Rate of 3 1/2%. Variable annuity rate tables
based upon an Assumed Investment Rate of 5% are also available where permitted
by state law.

The Assumed Investment Rate affects both the amount of the first variable
payment and the amount by which subsequent payments increase or decrease. The
Assumed Investment Rate does not affect the actuarial value of the future
payments as of the date when payments begin, though it does affect the actual
amount which may be received by an individual Annuitant.

Over a period of time, if each Division achieved a net investment result exactly
equal to the Assumed Investment Rate applicable to a particular payment plan,
the amount of annuity payments would be level. However, if the Division achieved
a net investment result greater than the Assumed Investment Rate, the amount of
annuity payments would increase. Similarly, if the Division achieved a net
investment result smaller than the Assumed Investment Rate, the amount of
annuity payments would decrease.

A higher Assumed Investment Rate will result in a larger initial payment but
more slowly rising and more rapidly falling subsequent payments than a lower
Assumed Investment Rate.

ADDITIONAL INFORMATION

TRANSFERS BETWEEN DIVISIONS AND PAYMENT PLANS You may change the allocation of
purchase payments among the Divisions and transfer values from one Division to
another both before and after annuity payments begin. In order to take full
advantage of these features, you should carefully consider, on a continuing
basis, which Division or apportionment is best suited to your long-term
investment needs. You may at any time change the allocation of purchase payments
among the Divisions by written notice to us. Purchase payments we receive at our
Home Office on and after the date on which we receive notice will be applied to
provide Accumulation Units in one or more Divisions on the basis of the new
allocation.

Before the effective date of a payment plan you may, upon written request,
transfer Accumulation Units from one Division to another. After the effective
date of a payment plan the payee may transfer Annuity Units from one Division to
another. We will adjust the number of Accumulation or Annuity Units to be
credited to reflect the respective value of the Accumulation and Annuity Units
in each of the Divisions. For Accumulation Units the minimum amount which may be
transferred is the lesser of $100 or the entire value of the Accumulation Units
in the Division from which the transfer is being made. For each transfer
beginning with the thirteenth in any Contract year, we may deduct a transfer fee
of $25 from the amount transferred. We currently make no charge for transfers.

If you contemplate the transfer of funds from one Division to another, you
should consider the risk inherent in a switch from one investment medium to
another. In general, frequent transfers based on short-term expectations for the
stock and bond markets, especially transfers of large sums, will tend to
accentuate the danger that a transfer will be made at an inopportune time.

You may transfer amounts which you have invested on a fixed basis to any
Division of the Account, and you may transfer the value of Accumulation Units in
any Division of the Account to the Guaranteed Interest Fund for investment on a
fixed basis, subject to the restrictions described in the Contract. See "The
Guaranteed Interest Fund", p. 10.

After the effective date of a payment plan which does not involve a life
contingency (i.e., Plan 1) a payee may transfer to either form of life annuity
at no charge. We will apply the value of the remaining payments to the new plan
selected. We will determine the amount of the first annuity payment under the
new plan on the basis of the particular plan selected, the annuity payment rate
and the Annuitant's adjusted age and sex. Subsequent payments will vary to
reflect changes in the value of the Annuity Units credited.

We permit other transfers between payment plans subject to such limitations as
we may reasonably determine. Generally, however, we do not permit transfer from
a payment plan involving a life contingency to a payment plan which does not
involve the same life contingency. You may make transfers from the Money Market
Division at any time while a payment plan is in force. The Contract provides
that transfers between the other Divisions and transfers between payment plans
may be made after the payment plan has been in force for at least 90 days and
thereafter whenever at least 90 days have elapsed since the date of the last
transfer. At present we permit transfers at any

                                       8

<PAGE>   16


time but we reserve the right to change this practice in the future. We will
make the transfer as of the close of business on the valuation date coincident
with or next following the date on which we receive the request for transfer at
our Home Office, or at a later date if you request.

OWNERS OF THE CONTRACT The Owner of the Contract has the sole right to exercise
all rights and privileges under the Contract, except as the Contract otherwise
provides. The Owner is ordinarily the Annuitant, but may be an employer or other
entity. The Annuitant is the person upon whose life the Contract is issued and
Contract benefits depend. The Primary Annuitant is the person upon whose life
the Contract is initially issued. The Contingent Annuitant is the person who
becomes the Annuitant upon the death of the Annuitant. In this prospectus, "you"
means the Owner or a prospective purchaser of the Contract.

DEFERMENT OF BENEFIT PAYMENTS We reserve the right to defer determination of the
withdrawal value of the Contract, or the payment of benefits under a variable
payment plan, until after the end of any period during which the right to redeem
shares of either of the mutual funds is suspended, or payment of the redemption
value is postponed, pursuant to the provisions of the Investment Company Act of
1940 because: (a) the New York Stock Exchange is closed, except for routine
closings on holidays or weekends; (b) the Securities and Exchange Commission has
determined that trading on the New York Stock Exchange is restricted; (c) the
Securities and Exchange Commission permits suspension or postponement and so
orders; (d) an emergency exists, as defined by the Securities and Exchange
Commission, so that valuation of the assets of the funds or disposal of
securities they hold is not reasonably practical; or (e) such suspension or
postponement is otherwise permitted by the Act.

DIVIDENDS The Contract shares in our divisible surplus, to the extent we
determine annually, except while payments are being made under a variable
payment plan. Distributions of divisible surplus are commonly referred to as
"dividends". Any contributions to our divisible surplus would result from more
favorable expense experience than we have assumed in determining the deductions.
We do not expect the Contract to make a significant contribution to our
divisible surplus and we do not expect to pay dividends on the Contract.

VOTING RIGHTS As long as the Account continues to be registered as a unit
investment trust under the Investment Company Act of 1940, and Account assets
are invested in shares of the Portfolio or the Funds, we will vote the shares
held in the Account in accordance with instructions we receive from the Owners
of Accumulation Units or payees receiving payments under variable payment plans.
Each Owner or payee will receive periodic reports relating to both of the mutual
funds, proxy material and a form with which to give instructions with respect to
the proportion of shares of each Portfolio or Fund held in the Account
corresponding to the Accumulation Units credited to his Contract, or the number
of shares of each Portfolio or Fund held in the Account representing the
actuarial liability under the variable annuity payment plan, as the case may be.
The number of shares will increase from year to year as additional purchase
payments are paid by the Contract Owner; after a variable annuity payment plan
is in effect the number of shares will decrease from year to year as the
remaining actuarial liability declines. We will vote shares for which no
instructions have been received in the same proportion as the shares as for
which instructions have been received.

SUBSTITUTION AND CHANGE We may take any of the following actions, so long as we
comply with all of the requirements of the securities and insurance laws that
may apply. A vote of Contract owners, or of those who have an interest in one or
more of the Divisions of the Account, may be required. Approval by the
Securities and Exchange Commission or another regulatory authority may be
required. In the event that we take any of these actions, we may make an
appropriate endorsement of your Contract and take other actions to carry out
what we have done.

1. We may invest the assets of a Division in securities of another mutual fund
or another issuer, instead of the Portfolio or Fund in which you have invested,
as a substitute for the shares you already have or as the securities to be
purchased in the future.

2. We may operate the Account or a Division as a mutual fund itself, instead of
investing its assets in a mutual fund, if our Board of Trustees decides that
this would be in the best interest of our Contract owners.

3. We may deregister the Account under the Investment Company Act of 1940 if
registration is no longer required.

4. We may change the provisions of the Contract to comply with federal or state
laws that apply, including changes to comply with federal tax laws in order to
assure that your Contract qualifies for tax benefits relating to retirement
annuity or variable annuity contracts.

FIXED ANNUITY PAYMENT PLANS We will also pay Contract benefits under fixed
annuity payment plans which are not described in this Prospectus. If you select
a fixed annuity, we will cancel the Accumulation Units credited to your Deferred
Contract, we will transfer the withdrawal value of the Contract to our general
account, and you will no longer have any interest in the Account.

PERFORMANCE DATA We may publish advertisements containing performance data for
the Divisions of the Account from time to time. These performance data may
include both standardized and non-standardized total return figures, although
standardized figures will always accompany non-standardized figures.

Standardized performance data will consist of quarterly return quotations, which
will always include quotations


                                       9
<PAGE>   17


for recent periods of one, five and ten years or, if less, the entire life of a
Division. These quotations will be the average annual rates of return based on
the minimum $50,000 initial purchase payment. The standardized performance data
will reflect all applicable charges.

Non-standardized performance data may also not reflect the annual Contract fee
of $30, since the impact of the fee varies by Contract size. The
non-standardized data may also be for other time periods.

We will base all of the performance data on actual historical investment results
for the Portfolios or Funds, including all expenses they bear. The data are not
intended to indicate future performance. We may construct some of the data
hypothetically to reflect expense factors for the Contracts we currently offer.

We have included additional information about the performance data in the
Statement of Additional Information.

FINANCIAL STATEMENTS Financial statements of the Account and financial
statements of Northwestern Mutual appear in the Statement of Additional
Information.

--------------------------------------------------------------------------------
THE GUARANTEED INTEREST FUND

You may direct all or part of your purchase payments to the Guaranteed Interest
Fund for investment on a fixed basis. You may transfer amounts previously
invested in the Account Divisions to the Guaranteed Interest Fund, prior to the
maturity date, and you may transfer amounts in the Guaranteed Interest Fund to
the Account Divisions. In each case, these transfers are subject to the
restrictions described in the Contract.

Amounts you invest in the Guaranteed Interest Fund become part of our general
assets. In reliance on certain exemptive and exclusionary provisions, we have
not registered interests in the Guaranteed Interest Fund under the Securities
Act of 1933 and we have not registered the Guaranteed Interest Fund as an
investment company under the Investment Company Act of 1940. Accordingly,
neither the Guaranteed Interest Fund nor any interests therein are generally
subject to these Acts. We have been advised that the staff of the Securities and
Exchange Commission has not reviewed the disclosure in this prospectus relating
to the Guaranteed Interest Fund. This disclosure, however, may be subject to
certain generally applicable provisions of the federal securities laws relating
to the accuracy and completeness of statements made in prospectuses.

Amounts you invest in the Guaranteed Interest Fund earn interest at rates we
declare from time to time. We will guarantee the interest rate for each amount
for at least one year. The interest rate will be at an annual effective rate of
at least 3%. At the expiration of the period for which we guarantee the interest
rate, we will declare a new interest rate. We credit interest and compound it
daily. We determine the effective date for a transaction involving the
Guaranteed Interest Fund in the same manner as the effective date for a
transaction involving a Division of the Account.

Investments in the Guaranteed Interest Fund are subject to a maximum limit of
$1,000,000 ($250,000 in New York) without our prior consent. To the extent that
a purchase payment or transfer from a Division of the Account causes the
Contract's interest in the Guaranteed Interest Fund to exceed this maximum
limit, we will place the amount of the excess in the Money Market Division and
it will remain there until you instruct us otherwise.

Transfers from the Guaranteed Interest Fund to the Account Divisions are subject
to limits. After a transfer from the Guaranteed Interest Fund, we will allow no
further transfers from the Guaranteed Interest Fund for a period of 365 days; in
addition, we will allow no further transfers back into the Guaranteed Interest
Fund for a period of 90 days. The maximum amount that you may transfer from the
Guaranteed Interest Fund in one transfer is the greater of (1) 25% of the amount
that you had invested in the Guaranteed Interest Fund as of the last Contract
anniversary preceding the transfer and (2) the amount of your most recent
transfer from the Guaranteed Interest Fund. But in no event will this maximum
transfer amount be less than $1,000 or more than $50,000. (The $50,000 limit
does not apply in New York.)

The deduction for mortality rate and expense risks, as described below, is not
assessed against amounts in the Guaranteed Interest Fund, and amounts in the
Guaranteed Interest Fund do not bear any expenses of either of the mutual funds.
Other charges under the Contract apply for amounts in the Guaranteed Interest
Fund as they are described in this prospectus for amounts you invest on a
variable basis. See "Deductions", p. 13. For purposes of allocating and
deducting the annual Contract fee, we consider any investment in the Guaranteed
Interest Fund as though it were an investment of the same amount in one of the
Account Divisions.


                                       10

<PAGE>   18
FEDERAL INCOME TAXES

QUALIFIED AND NONTAX-QUALIFIED PLANS

We offer the Contract for use under the tax-qualified plans (i.e., contributions
are generally not taxable) identified below:

1. Individual retirement annuities pursuant to the provisions of Section 408
   of the Code, including a traditional IRA established under Section 408(b).

2. Roth IRAs pursuant to the provisions of Section 408A of the Code.

We also offer the Contract for use in non tax-qualified situations (i.e.,
contributions are taxable).

CONTRIBUTION LIMITATIONS AND GENERAL REQUIREMENTS APPLICABLE TO CONTRACT

TRADITIONAL IRA If an individual has earned income, the individual and the
individual's spouse are each permitted to make a maximum contribution of $2,000
to an IRA or IRAs for their benefit for each taxable year. The $2,000 limit is
reduced by contributions to any Roth IRAs of the Owner. Contributions cannot be
made after age 70 1/2. Annual contributions are generally deductible unless the
Owner or the Owner's spouse is an "active participant" in a plan in another
qualified plan during the taxable year. If the Owner is an "active participant"
in a plan, the deduction for 2000 phases out at an adjusted gross income ("AGI")
of between $32,000 - $42,000 (indexed through 2005) for single filers and
between $52,000 - $62,000 (indexed through 2007) for married individuals filing
jointly. If the Owner is not an "active participant" in a plan but the Owner's
spouse is, the Owner's deduction phases out at an AGI of between $150,000 -
$160,000.

The Owner may also make tax free rollover and direct transfer contributions to
an IRA from the Owner's other IRAs or contracts purchased under tax qualified
plans. The surviving spouse can also roll over the deceased Owner's IRA, tax
deferred annuity or qualified plan to the spouse's own IRA.

An IRA is nonforfeitable and generally cannot be transferred.

ROTH IRA If an individual has earned income, the individual and the individual's
spouse are each permitted to make a maximum contribution of $2,000 to a Roth IRA
or IRAs for their benefit for each taxable year. The $2,000 limit is reduced by
contributions to any traditional IRAs of the Owner. The maximum contribution is
phased out at an adjusted gross income ("AGI") of between $95,000 and $110,000
for single filers, between $150,000 and $160,000 for married individuals filing
jointly and between $0 and $10,000 for married individuals filing separately.
Regular contributions to a Roth IRA are not deductible.

An IRA, SEP or SIMPLE IRA (after two years of participation in a SIMPLE IRA
plan) may be rolled over or converted to a Roth IRA if the Owner has an AGI of
$100,000 or less for the year (not including the rollover amount) and is not
married filing a separate tax return. A rollover to a Roth IRA is fully taxable
but is not subject to a 10% premature withdrawal penalty.

NONTAX-QUALIFIED CONTRACT There are no limitations on who can purchase a
nontax-qualified annuity or the amount that can be contributed to the Contract.
Contributions to nontax-qualified Contracts are not deductible. For the Contract
to qualify as a nontax- qualified annuity, the Contract death proceeds must be
distributed to any nonspouse beneficiary either within five years of the Owner's
death or as substantially periodic payments over the beneficiary's life or life
expectancy commencing within one year of the Owner's death. The surviving spouse
is entitled to continue deferral under the Contract.

TAXATION OF CONTRACT BENEFITS

For Contracts held by individuals, no tax is payable as a result of any increase
in the value of a Contract. Except for qualified distributions from Roth IRAs,
Contract benefits will be taxable as ordinary income when received in accordance
with Section 72 of the Code.

IRAS As a general rule, benefits received as annuity payments or upon death or
withdrawal from these contracts will be taxable as ordinary income when
received.

Where nondeductible contributions are made to individual retirement annuities,
the Owner may exclude from income that portion of each benefit payment which
represents a return of the Owner's "investment in the contract" as defined in
Section 72 until the entire "investment in the contract" is recovered. Benefits
paid in a form other than an annuity will be taxed as ordinary income when
received except for that portion of the payment which represents a return of the
employee's "investment in the contract." After the Owner attains age 70 1/2, a
50% penalty may be imposed on payments made from individual retirement annuities
to the extent the payments are less than certain required minimum amounts. (See
"Minimum Distribution Requirements", p. 12). With certain limited exceptions
benefits from individual retirement annuities Contracts are subject to the
tax-free roll-over provisions of the Code.

A loan transaction, using a Contract purchased under a tax-qualified plan as
collateral, will generally have adverse tax consequences. For example, such a
transaction destroys the tax status of the individual retirement annuity and
results in taxable income equal to the Contract value.

ROTH IRAS Qualified distributions from a Roth IRA are not taxable. A qualified
distribution is a distribution (1) made at least 5 years after the issuance of
the Owner's first Roth IRA, and (2) made after the Owner has attained age 59
1/2, made to a beneficiary after the

                                       11

<PAGE>   19



Owner's death, attributable to the Owner being disabled, or used to pay
acquisition expenses of a qualified first time home purchase. A nonqualified
distribution is taxable as ordinary income only to the extent it exceeds the
"investment in the contract" as defined in Section 72. Distributions are not
required to be made from a Roth IRA before the Owner's death.

A withdrawal from a Roth IRA of part or all of an IRA rollover contribution
within 5 years of the rollover is subject to a 10% premature withdrawal penalty
(unless an exception applies). In addition, if part or all of an IRA rollover
made in 1998 is withdrawn before 1/1/2001, any taxes on the rollover deferred by
proration may be accelerated. Rollover contributions are treated as withdrawn
after regular contributions for this purpose.

A regular or conversion contribution to a Roth IRA can be recharacterized to an
IRA in a trustee-to-trustee transfer provided the transfer includes the net
income or loss allocable to the contribution and is completed by the due date
for filing the Owner's federal income tax return for the year the contribution
was made. The recharacterized amount will be treated for tax purposes as
originally made from the IRA. Recharacterized amounts can be reconverted to a
Roth IRA once each calendar year. Benefits from a Roth IRA can be rolled over or
transferred directed only to another Roth IRA.

NONQUALIFIED CONTRACTS Benefits received as annuity payments from
nontax-qualified Contracts will be taxable as ordinary income to the extent they
exceed that portion of each payment which represents a return of the "investment
in the contract" as defined in Section 72 until the entire "investment in the
contract" is recovered. Benefits received in a lump sum from these Contracts
will be taxable as ordinary income to the extent they exceed the "investment in
the contract." A partial withdrawal or collateral assignment prior to the
Maturity Date will result in the receipt of gross income by the Owner to the
extent that the amounts withdrawn or assigned do not exceed the excess (if any)
of the total value of Accumulation Units over total purchase payments paid under
the Contract less any amounts previously withdrawn or assigned. Thus, any
investment gains reflected in the Contract values are considered to be withdrawn
first and are taxable as ordinary income. For Contracts issued after October 21,
1988, investment gains will be determined by aggregating all nontax-qualified
deferred Contracts we issue to the Owner during the same calendar year.

A special rule applies to certain nonqualified Contracts not held by
individuals, such as Contracts purchased by corporate employers in connection
with deferred compensation plans. With respect to purchase payments paid after
February 28, 1986, these Contracts will not be taxed as annuity Contracts and
increases in the value of the Contracts will be taxable in the year earned. One
or more nontax-qualified Contracts can be wholly or partially exchanged for one
or more other annuity contracts under Section 1035 of the Code without
recognition of gain or loss.

PREMATURE WITHDRAWALS A penalty tax will apply to premature payments of Contract
benefits. A penalty tax of 10% of the amount of the payment which is includible
in income will be imposed on non-exempt withdrawals under individual retirement
annuities, Roth IRAs, and nonqualified deferred annuities. Payments which are
exempt from the penalty tax include payments upon disability, after age 59-1/2
and for certain substantially equal periodic payments for life. Additional
exceptions for certain large medical expenses, reimbursement of health insurance
premiums paid while the Owner was unemployed, qualified education expenses and
first time home purchases apply to IRAs and Roth IRAs.

MINIMUM DISTRIBUTION REQUIREMENTS All of the Contracts are required to satisfy
some form of minimum distribution requirement. A 50% excise tax applies for each
violation of these requirements. 1. IRAs As a general rule, the Owner of these
Contracts is required to take certain distributions during the Owner's life and
the beneficiary designated by the Owner is required to take the balance of the
Contract value within certain specified periods following the Owner's death.

The Owner must take the first required distribution by the "required beginning
date" and subsequent required distributions by December 31 of that year and each
year thereafter. Payments must be made over the life or life expectancy of the
Owner or the lives or life expectancies of the Owner and the Owner's
beneficiary. The required beginning date for IRAs is April 1 of the calendar
year following the calendar year the Owner attains age 70 1/2.

Upon the death of the Owner, the Owner's beneficiary must take distributions
under one of the following two rules.

If the Owner dies on or after the required beginning date, any remaining
interest in the Contract must be distributed at least as rapidly as it was under
the method of distribution in effect on the date of death. The method of
distribution is determined by the age of the Owner and the beneficiary and
whether their life expectancies are being recalculated each year.

If the Owner dies before the required beginning date, the Owner's entire
interest must be distributed by December 31 of the calendar year containing the
fifth anniversary of the Owner's death. If the Contract value is payable to a
beneficiary designated by the Contract, the Contract value may be paid over the
life or life expectancy of that beneficiary, provided distribution begins by
December 31 of the calendar year following the year of the Owner's death. If the
sole designated beneficiary is the Owner's spouse, the spouse may roll over the
Contract into an IRA owned by the spouse.

                                       12

<PAGE>   20


2. Roth IRAs The Owner of a Roth IRA is not required to take required minimum
distributions during the Owner's lifetime. However, the beneficiary designated
by the Owner is required to take distributions pursuant to the minimum
distribution requirements for Owners dying before the required beginning date,
discussed above.

3. Nonqualified Contracts The Owner of a nontax-qualified Contract is not
required to take required minimum distributions during the Owner's lifetime.
However, the designated beneficiary is required to take distributions pursuant
to rules similar to the at death minimum distribution requirements for IRAs.

TAXATION OF NORTHWESTERN MUTUAL

We may charge the appropriate Contracts with their shares of any tax liability
which may result from the maintenance or operation of the Divisions of the
Account. We are currently making no charge. (See "Net Investment Factor", p. 6
and "Deductions", below.

OTHER CONSIDERATIONS

You should understand that the tax rules for annuities and qualified plans are
complex and cannot be readily summarized. The foregoing discussion does not
address special rules applicable in many situations, rules governing Contracts
issued or purchase payments made in past years, current legislative proposals or
state or other law. We do not intend this discussion as tax advice. Before you
purchase a Contract, we advise you to consult qualified tax counsel.

--------------------------------------------------------------------------------
DEDUCTIONS

We will make the following deductions:

MORTALITY RATE AND EXPENSE RISK CHARGES

Amount of Mortality Rate and Expense Risks Charges. The net investment factor
(see "Net Investment Factor", p. 6) we use in determining the value of
Accumulation and Annuity Units reflects a deduction on each valuation date for
mortality rate and expense risks we have assumed. The deduction from
Accumulation Units and Annuity Units is at a current annual rate of 0.35% of the
assets of the Account. Our Board of Trustees may increase or decrease the
deduction, but in no event may the deduction exceed an annual rate of 0.75%. We
will not increase the deduction for mortality and expense risks for at least
five years from the date of this prospectus.

Risks and Expenses. The risks we assume are (a) the risk that annuity payments
will continue for longer periods than anticipated because the Annuitants as a
group live longer than expected, and (b) the risk that the charges we make may
be insufficient to cover the actual costs we incur in connection with the
Contracts. We assume these risks for the duration of the Contract. The deduction
for these risks is the only expense item paid by the Account to date. The mutual
funds pay expenses which are described in the attached prospectuses for the
mutual funds.

The net investment factor also reflects the deduction of any reasonable expenses
which may result if there were a substitution of other securities for shares of
the mutual funds as described under "Substitution and Change", p. 9, and any
applicable taxes, i.e., any tax liability we have paid or reserved for resulting
from the maintenance or operation of a Division of the Account, other than
applicable premium taxes which we may deduct directly from considerations. We do
not presently anticipate that we will make any deduction for federal income
taxes (see "Taxation of Northwestern Mutual", p. 13), nor do we anticipate that
maintenance or operation of the Account will give rise to any deduction for
state or local taxes. However, we reserve the right to charge the appropriate
Contracts with their shares of any tax liability which may result under present
or future tax laws from the maintenance or operation of the Account or to deduct
any such tax liability in the computation of the net investment factor for such
Contracts.

CONTRACT FEE On each Contract anniversary prior to the maturity date we make a
deduction of $30 for administrative expenses relating to a Deferred Contract
during the prior year. We make the charge by reducing the number of Accumulation
Units credited to the Contract. For purposes of allocating and deducting the
annual Contract fee, we consider any investment in the Guaranteed Interest Fund
as though it were an investment of the same amount in one of the Account
Divisions. We cannot increase this charge. The charge is intended only to
reimburse us for our actual administrative expenses. We currently are waiving
the charge if the Contract value on the Contract anniversary is $25,000 or more.

ENHANCED DEATH BENEFIT CHARGE On each Contract anniversary on which the enhanced
death benefit is in effect, we deduct from the Contract value a charge based on
the amount of the enhanced death benefit on the Contract Anniversary and the age
of the Annuitant when the Contract was issued. The charge is 0.10% of the amount
of the enhanced death benefit for issue age 45 or less, 0.20% for issue age
46-55, and 0.40% for issue age 56-65. This charge is for the risks we assume in
guaranteeing the enhanced death benefit. We deduct the charge from the Divisions
of the Account and the Guaranteed Interest Fund in proportion to the amounts you
have invested.

                                     13
<PAGE>   21




PREMIUM TAXES The Contract provides for the deduction of applicable premium
taxes, if any, from purchase payments or from Contract benefits. Various
jurisdictions levy premium taxes. Premium taxes presently range from 0% to 3.5%
of total purchase payments. Many jurisdictions presently exempt from premium
taxes annuities such as the Contract. As a matter of current practice, we do not
deduct premium taxes from purchase payments received under the Contract or from
Contract benefits. However, we reserve the right to deduct premium taxes in the
future.

EXPENSES FOR THE PORTFOLIOS AND FUNDS The expenses borne by the Portfolios and
Funds in which the assets of the Account are invested are described in the
prospectuses for Northwestern Mutual Series Fund, Inc. and the Russell Insurance
Funds. See the prospectuses attached to this prospectus.


--------------------------------------------------------------------------------
DISTRIBUTION OF THE CONTRACT

We sell the Contract through individuals who are licensed insurance agents
appointed by Northwestern Mutual and are registered representatives of a broker
dealer. Where state law requires, these agents will also be licensed securities
salespersons. Our wholly-owned subsidiary, Northwestern Mutual Investment
Services, LLC ("NMIS"), is registered with the Securities and Exchange
Commission and is a member of the National Association of Securities Dealers.
NMIS is the distributor of the Contracts. NMIS has entered into a selling
agreement with Robert W. Baird and Co. Incorporated ("Baird"), another
broker/dealer which we control, and our agents who offer the Contracts will be
registered representatives of Baird. Neither we nor Baird will pay commissions
on sales of the Contracts, but Baird will offer the Contracts to purchasers who
pay quarterly fees to Baird based on the value of the assets in their Baird
accounts, including the Contracts. Baird will pay a portion of the fees to its
registered representatives who sell the Contracts and provide other services to
the owners of the Accounts. The Contract is also offered by Northwestern Mutual
agents who are advisory representatives of registered investment advisers. The
investment advisers charge fees for investment advisory services and pay a
portion of those fees to the advising representatives. We may also offer the
Contracts through other distribution arrangements.


                                       14

<PAGE>   22


           TABLE OF CONTENTS FOR STATEMENT OF ADDITIONAL INFORMATION

<TABLE>
<CAPTION>

                                               PAGE                                                                    PAGE
                                               ----                                                                    ----

<S>                                            <C>                     <C>                                             <C>
DISTRIBUTION OF THE                                                     FINANCIAL STATEMENTS OF THE
  CONTRACT......................................B-2                       ACCOUNT (for the two years ended
DETERMINATION OF ANNUITY                                                December 31, 1999)..............................B-5
  PAYMENTS......................................B-2                     REPORT OF INDEPENDENT
    Amount of Annuity Payments..................B-2                       ACCOUNTANTS (for the two years ended
    Annuity Unit Value..........................B-2                         December 31, 1999).........................B-17
    Illustrations of Variable Annuity                                   FINANCIAL STATEMENTS OF
      Payments..................................B-3                       NORTHWESTERN MUTUAL  (for
VALUATION OF ASSETS OF THE                                                the three years ended December 31, 1999).....B-18
  ACCOUNT.......................................B-3                     REPORT OF INDEPENDENT
TRANSFERABILITY RESTRICTIONS....................B-4                       ACCOUNTANTS (for the three years
PERFORMANCE DATA................................B-4                        ended December 31, 1999)....................B-29
EXPERTS.........................................B-4
</TABLE>



This Prospectus sets forth concisely the information about the Mason Street
Variable Annuity that a prospective investor ought to know before investing.
Additional information about the Mason Street Variable Annuity and NML Variable
Annuity Account B has been filed with the Securities and Exchange Commission in
a Statement of Additional Information which is incorporated herein by reference.
The Statement of Additional Information is available upon request and without
charge from The Northwestern Mutual Life Insurance Company. To receive a copy,
return the request form to the address listed below, or telephone
1-888-455-2232.


<TABLE>
<CAPTION>
<S><C>

 -------------------------------------------------------------------------------
|    TO: The Northwestern Mutual Life Insurance Company
|
|        Annuity and Accumulation Products Marketing Department
|            Room E12J
|        720 East Wisconsin Avenue
|        Milwaukee, WI  53202
|
|        Please send a Statement of Additional Information for the Mason Street
|        Variable Annuity to:
|
|    Name
|        -----------------------------------------------------------------------
|
|    Address
|           --------------------------------------------------------------------
|
|    ---------------------------------------------------------------------------
|
|     City                                         State           Zip
|         --------------------------------------        ----------    ----------

</TABLE>


<PAGE>   23


More information about Northwestern Mutual Series Fund, Inc. is included in the
Fund's Statement of Additional Information (SAI), incorporated by reference in
this prospectus, which is available free of charge.

More information about the Fund's investments is included in the Fund's annual
and semi-annual reports, which discuss the market conditions and investment
strategies that significantly affected each Portfolio's performance during the
previous fiscal period.

To request a free copy of the Fund's SAI, or current annual or semi-annual
report, call us at 1-888-455-2232. Information about the Fund (including the
SAI) can be reviewed and copied at the Public Reference Room of the Securities
and Exchange Commission (SEC) in Washington, DC. Information on the operation of
the Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.
Reports and other information about the Fund are available on the SEC's Internet
site at http://www.sec.gov. Copies of this information may be obtained, upon
payment of a duplicating fee, by writing the Public Reference Section of the
SEC, Washington, DC 20549-6009.


N O R T H W E S T E R N  M U T U A L

MASON STREET VARIABLE ANNUITY
     Nontax-Qualified Annuities
     Individual Retirement Annuities
     Roth IRAs

NML VARIABLE ANNUITY ACCOUNT B

NORTHWESTERN MUTUAL SERIES FUND, INC.

RUSSELL INSURANCE FUNDS


P  R  O  S  P  E  C  T  U  S  E  S


Investment Company Act File Nos. 811-3990 and 811-5371

NORTHWESTERN MUTUAL(TM)

PO Box 3095
Milwaukee  WI  53201-3095

Change Service Requested





<PAGE>   24
                       STATEMENT OF ADDITIONAL INFORMATION


                           VARIABLE ANNUITY CONTRACTS
          (for Individual Retirement Annuities, Tax-Deferred Annuities
                            and Non-Qualified Plans)

                         NML VARIABLE ANNUITY ACCOUNT B
                                (the "Account"),
                        a separate investment account of
                 The Northwestern Mutual Life Insurance Company
                             ("Northwestern Mutual")


--------------------------------------------------------------------------------
     This Statement of Additional Information is not a prospectus but
     supplements and should be read in conjunction with the prospectus for the
     Contract. A copy of the prospectus may be obtained from The Northwestern
     Mutual Life Insurance Company, 720 East Wisconsin Avenue, Milwaukee,
     Wisconsin 53202, telephone number (414) 271-1444.
--------------------------------------------------------------------------------

          The Date of the Prospectus to which this Statement of
          Additional Information Relates is June 30, 2000.

          The Date of this Statement of Additional Information
          is June 30, 2000.


                                      B-1

<PAGE>   25

                          DISTRIBUTION OF THE CONTRACT

     Northwestern Mutual Investment Services, LLC ("NMIS") is the distributor of
the Contract and may be considered the principal underwriter of the Contract.
NMIS is a wholly-owned subsidiary of Northwestern Mutual. NMIS has entered into
a selling agreement with Robert W. Baird & Co. Incorporated ("Baird"), a
broker-dealer controlled by Northwestern Mutual. NMIS may enter into selling
agreements with other affiliated and unaffiliated broker-dealers to distribute
the Contract. The offering will be continuous. No Contracts have been issued
prior to the date of statement of Additional Information.

                        DETERMINATION OF ANNUITY PAYMENTS

     The following discussion of the method for determining the amount of
monthly annuity payments under a variable payment plan is intended to be read in
conjunction with these sections of the prospectus for the Contracts: "Variable
Payment Plans", p. 7, including "Description of Payment Plans", p. 7, "Amount of
Annuity Payments", p. 8, and "Assumed Investment Rate", p. 8; "Dividends", p. 9;
"Net Investment Factor", p. 6; and "Deductions", p. 13.

     AMOUNT OF ANNUITY PAYMENTS The amount of the first annuity payment under a
variable Payment Plan will be determined on the basis of the particular Payment
Plan selected, the annuity payment rate and, for plans involving life
contingencies, the Annuitant's adjusted age and sex. The amount of the first
payment is the sum of the payments from each Division of the Account determined
by applying the appropriate annuity payment rate to the product of the number of
Accumulation Units in the Division on the effective date of the Payment Plan and
the Accumulation Unit value for the Division on that date. Annuity rates
currently in use are based on the 1983 a Table with Projection Scale G and age
adjustment.

     Variable annuity payments after the first will vary from month to month and
will depend upon the number and value of Annuity Units credited to the
Annuitant. After the effective date of a Payment Plan a Contract will not share
in the divisible surplus of Northwestern Mutual.

     The number of Annuity Units in each Division is determined by dividing the
amount of the first annuity payment from the Division by the value of an Annuity
Unit on the effective date of the Payment Plan. The number of Annuity Units thus
credited to the Annuitant in each Division remains constant throughout the
annuity period. However, the value of Annuity Units in each Division will
fluctuate with the investment experience of the Division.

     The amount of each variable annuity payment after the first is the sum of
payments from each Division determined by multiplying this fixed number of
Annuity Units each month by the value of an Annuity Unit for the Division on (a)
the fifth valuation date prior to the payment due date if the payment due date
is a valuation date, or (b) the sixth valuation date prior to the payment due
date if the payment due date is not a valuation date. To illustrate, if a
payment due date falls on a Friday, Saturday or Sunday, the amount of the
payment will normally be based upon the Annuity Unit value calculated on the
preceding Friday. The preceding Friday would be the fifth valuation date prior
to the Friday due date, and the sixth valuation date prior to the Saturday or
Sunday due dates.

     ANNUITY UNIT VALUE The value of an Annuity Unit for each Division is
established at $1.00 as of the date operations begin for that Division. The
value of an Annuity Unit on any later date varies to reflect the investment
experience of the Division, the Assumed Investment Rate on which the annuity
rate tables are based, and the deduction for mortality rate and expense risks
assumed by Northwestern Mutual.


                                      B-2

<PAGE>   26


     The Annuity Unit value for each Division on any valuation date is
determined by multiplying the Annuity Unit value on the immediately preceding
valuation date by two factors: (a) the net investment factor for the current
period for the Division; and (b) an adjustment factor to neutralize the Assumed
Investment Rate used in calculating the annuity rate tables.

     ILLUSTRATIONS OF VARIABLE ANNUITY PAYMENTS To illustrate the manner in
which variable annuity payments are determined consider this example. Item (4)
in the example shows the applicable monthly payment rate for a male, adjusted
age 65, who has elected a life annuity Payment Plan with a certain period of 10
years with an Assumed Investment Rate of 3-1/2% (Plan 2, as described in the
prospectus). The example is for a Contract with sex-distinct rates.

<TABLE>
<S>                                                                                  <C>
     (1)  Assumed number of Accumulation Units in
          Balanced Division on maturity date........................................ 25,000

     (2)  Assumed Value of an Accumulation Unit in
          Balanced Division at maturity............................................. $2.000000

     (3)  Cash Value of Contract at maturity, (1) X (2)............................. $50,000

     (4)  Assumed applicable monthly payment rate per
          $1,000 from annuity rate table............................................ $5.35

     (5)  Amount of first payment from Balanced Division,
          (3) X (4) divided by $1,000............................................... $267.50

     (6)  Assumed Value of Annuity Unit in
          Balanced Division at maturity............................................. $1.500000

     (7)  Number of Annuity Units credited in
          Balanced Division, (5) divided by (6)..................................... 178.33
</TABLE>


The $50,000 value at maturity provides a first payment from the Balanced
Division of $267.50, and payments thereafter of the varying dollar value of
178.33 Annuity Units. The amount of subsequent payments from the Balanced
Division is determined by multiplying 178.33 units by the value of an Annuity
Unit in the Balanced Division on the applicable valuation date. For example, if
that unit value is $1.501000, the monthly payment from the Division will be
178.33 multiplied by $1.501000, or $267.68.

     However, the value of the Annuity Unit depends entirely on the investment
performance of the Division. Thus in the example above, if the net investment
rate for the following month was less than the Assumed Investment Rate of
3-1/2%, the Annuity Unit would decline in value. If the Annuity Unit value
declined to $1.499000 the succeeding monthly payment would then be 178.33 X
$1.499000, or $267.32.

     For the sake of simplicity the foregoing example assumes that all of the
Annuity Units are in the Balanced Division. If there are Annuity Units in two or
more Divisions, the annuity payment from each Division is calculated separately,
in the manner illustrated, and the total monthly payment is the sum of the
payments from the Divisions.

                       VALUATION OF ASSETS OF THE ACCOUNT

     The value of Portfolio or Fund shares held in each Division of the Account
at the time of each valuation is the redemption value of such shares at such
time. If the right to redeem shares of a Portfolio or Fund has been suspended,
or payment of redemption value has been postponed, for the sole purpose of


                                      B-3

<PAGE>   27

computing annuity payments the shares held in the Account (and Annuity Units)
may be valued at fair value as determined in good faith by the Board of Trustees
of Northwestern Mutual.

                          TRANSFERABILITY RESTRICTIONS

     Ownership of a Contract purchased as an individual retirement annuity
pursuant to Section 408(b) of the Code cannot be transferred except in limited
circumstances involving divorce.

                                PERFORMANCE DATA

     Standardized performance data in advertisements will show the average
annual total return for each Division of the Account, according to the following
formula prescribed by the Securities and Exchange Commission:

                                 P(1 + T) = ERV
                    Where:
              P   = a hypothetical initial payment of $1000
              T   = average annual total return
              n   = number of years
              ERV = ending redeemable value of a hypothetical $1000
                    payment made at the beginning of the 1, 5
                    or 10 year periods at the end of the 1, 5,
                    or 10 year periods (or fractional portion thereof)

Average annual total return is the annual compounded rate of return that would
have produced the ending surrender value under a Contract if the owner had
invested in a specified Division over the stated period and investment
performance had remained constant throughout the period. The calculation assumes
a single $1,000 purchase payment made at the beginning of the period and
surrender of the Contract at the end of the period. It reflects a deduction for
all Account, Fund and Contract level charges. The $30 annual Contract fee is
reflected as 0.00% of the assets based on actual fees collected divided by
average assets of the sub-account. The data will assume a minimum initial
purchase payment of $50,000 and the amounts will be divided by 50 to conform the
presentation to the $1,000 purchase payment assumption required by the
prescribed formula.

     Advertisements with performance data may compare the average annualized
total return figures for one or more of the Divisions to (1) the Standard &
Poor's 500 Composite Stock Price Index, Wilshire Index, 1750 Index, EAFE Index,
Merrill Lynch Domestic Master Index, Lehman Brothers High Yield Intermediate
Market Index or other indices measuring performance of a relevant group of
securities; (2) other variable annuity separate account tracked by Lipper
Analytical Services or other ratings services; or (3) the Consumer Price Index.

                                     EXPERTS

     The financial statements of the Account as of December 31, 1999 and for
each of the two years in the period ended December 31, 1999 and of Northwestern
Mutual as of December 31, 1999 and 1998 and for each of the three years in the
period ended December 31, 1999 included in this Statement of Additional
Information have been so included in reliance on the reports of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting. PricewaterhouseCoopers LLP
provides audit services for the Account. The address of PricewaterhouseCoopers
LLP is 100 East Wisconsin Avenue, Suite 1500, Milwaukee, Wisconsin 53202.


                                      B-4

<PAGE>   28

NML VARIABLE ANNUITY ACCOUNT B
Statement of Assets and Liabilities
December 31, 1999
(in thousands)

<TABLE>
<CAPTION>

 <S>                                                             <C>           <C>
 ASSETS
   Investments at Market Value:
     Northwestern Mutual Series Fund, Inc.
       Small Cap Growth Stock
          27,193 shares (cost $37,604).......................    $   48,783
       Aggressive Growth Stock
          215,334 shares (cost $555,089).....................     1,034,844
       International Equity
          303,030 shares (cost $504,068).....................       539,533
       Index 400 Stock
          21,966 shares (cost $22,628).......................        24,446
       Growth Stock
          177,511 shares (cost $317,010).....................       471,358
       Growth and Income Stock
          308,439 shares (cost $430,942).....................       481,356
       Index 500 Stock
          399,680 shares (cost $819,803).....................     1,553,169
       Balanced
          1,297,394 shares (cost $1,973,688).................     2,882,069
       High Yield Bond
          139,784 shares (cost $147,597).....................       114,877
       Select Bond
          204,593 shares (cost $242,359).....................       231,339
       Money Market
          288,940 shares (cost $288,940).....................       288,865
     Russell Insurance Funds
       Multi-Style Equity
          2,914 shares (cost $47,148)........................        48,928
       Aggressive Equity
          1,224 shares (cost $15,133)........................        16,353
       Non-U.S.
          1,614 shares (cost $20,196)........................        22,899
       Real Estate Securities
          757 shares (cost $6,897)...........................         6,666
       Core Bond
          1,418 shares (cost $14,136)........................        13,668    $7,779,153
                                                                 ----------
   Due from Sale of Fund Shares..............................                      22,988
   Due from Northwestern Mutual Life Insurance Company.......                      14,544
                                                                               ----------
            Total Assets.....................................                  $7,816,685
                                                                               ==========

 LIABILITIES
   Due to Participants.......................................                  $   10,731
   Due to Northwestern Mutual Life Insurance Company.........                      22,988
   Due on Purchase of Fund Shares............................                      14,544
                                                                               ----------
            Total Liabilities................................                      48,263
                                                                               ----------

 EQUITY (NOTE 8)
   Contracts Issued Prior to December 17, 1981...............                     123,366
   Contracts Issued After December 16, 1981 and Prior to
     March 31, 1995..........................................                   4,739,831
   Contracts Issued On or After March 31, 1995:
     Front Load Version......................................                     956,368
     Back Load Version.......................................                   1,948,857
                                                                               ----------
            Total Equity.....................................                   7,768,422
                                                                               ----------
            Total Liabilities and Equity.....................                  $7,816,685
                                                                               ==========
</TABLE>

    The Accompanying Notes are an Integral Part of the Financial Statements

                                      B- 5        Account B Financial Statements
<PAGE>   29

NML VARIABLE ANNUITY ACCOUNT B

<TABLE>
<CAPTION>
           Statement of Operations                                                  SMALL CAP
               (in thousands)                                                      GROWTH STOCK           AGGRESSIVE GROWTH
                                                           COMBINED                 DIVISION#               STOCK DIVISION
                                                 ----------------------------      ------------      ----------------------------
                                                                                   EIGHT MONTHS
                                                  YEAR ENDED      YEAR ENDED          ENDED           YEAR ENDED      YEAR ENDED
                                                 DECEMBER 31,    DECEMBER 31,      DECEMBER 31,      DECEMBER 31,    DECEMBER 31,
                                                     1999            1998              1999              1999            1998
---------------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>             <C>               <C>               <C>             <C>
INVESTMENT INCOME
  Dividend Income............................     $  529,297       $279,975          $ 1,623           $ 27,399        $29,446
  Annuity Rate and Expense Guarantees........         79,966         67,916              114              9,338          9,236
                                                  ----------       --------          -------           --------        -------
  Net Investment Income (Loss)...............        449,331        212,059            1,509             18,061         20,210
                                                  ----------       --------          -------           --------        -------

REALIZED AND UNREALIZED GAIN ON INVESTMENTS
  Realized Gain on Investments...............        206,068         88,924              152             59,354         27,122
  Unrealized Appreciation (Depreciation) of
    Investments During the Period............        384,910        521,055           11,180            227,531            650
                                                  ----------       --------          -------           --------        -------
  Net Gain (Loss) on Investments.............        590,978        609,979           11,332            286,885         27,772
                                                  ----------       --------          -------           --------        -------
  Increase (Decrease) in Equity Derived from
    Investment Activity......................     $1,040,309       $822,038          $12,841           $304,946        $47,982
                                                  ==========       ========          =======           ========        =======
</TABLE>

# The initial investment in this Division was made on April 30, 1999.

    The Accompanying Notes are an Integral Part of the Financial Statements

Account B Financial Statements        B- 6
<PAGE>   30
<TABLE>
<CAPTION>
                                     INDEX 400
                                       STOCK
    INTERNATIONAL EQUITY DIVISION    DIVISION#        GROWTH STOCK DIVISION
    -----------------------------   ------------   ---------------------------
                                    EIGHT MONTHS
     YEAR ENDED      YEAR ENDED        ENDED        YEAR ENDED     YEAR ENDED
    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
        1999            1998            1999           1999           1998
------------------------------------------------------------------------------
<S> <C>             <C>             <C>            <C>            <C>
      $ 69,655        $ 29,263         $  321        $13,945        $ 4,848
         5,699           6,000             76          4,263          2,665
      --------        --------         ------        -------        -------
        63,956          23,263            245          9,682          2,183
      --------        --------         ------        -------        -------

        78,270          17,380             14          2,979          1,471
       (44,084)        (24,915)         1,819         64,234         49,578
      --------        --------         ------        -------        -------
        34,186          (7,535)         1,833         67,213         51,049
      --------        --------         ------        -------        -------
      $ 98,142        $ 15,728         $2,078        $76,895        $53,232
      ========        ========         ======        =======        =======

<CAPTION>

           GROWTH & INCOME                  INDEX 500
           STOCK DIVISION                STOCK DIVISION
     ---------------------------   ---------------------------

      YEAR ENDED     YEAR ENDED     YEAR ENDED     YEAR ENDED
     DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
         1999           1998           1999           1998
---  ---------------------------------------------------------
<S>  <C>            <C>            <C>            <C>
       $ 51,672       $ 3,489        $ 31,626       $ 32,261
          5,158         4,034          15,550         11,266
       --------       -------        --------       --------
         46,514          (545)         16,076         20,995
       --------       -------        --------       --------
          5,902         2,454          24,827         15,353
        (24,965)       67,034         206,443        198,764
       --------       -------        --------       --------
        (19,063)       69,488         231,270        214,117
       --------       -------        --------       --------
       $ 27,451       $68,943        $247,346       $235,112
       ========       =======        ========       ========
</TABLE>

                                      B- 7        Account B Financial Statements
<PAGE>   31

NML VARIABLE ANNUITY ACCOUNT B

<TABLE>
<CAPTION>
      Statement of Operations
          (in thousands)
                                          BALANCED DIVISION            HIGH YIELD BOND DIVISION          SELECT BOND DIVISION
                                     ----------------------------    ----------------------------    ----------------------------
                                      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED
                                     DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
            (CONTINUED)                  1999            1998            1999            1998            1999            1998
---------------------------------------------------------------------------------------------------------------------------------
<S>                                  <C>             <C>             <C>             <C>             <C>             <C>
INVESTMENT INCOME
  Dividend Income..................    $284,717        $143,628        $ 13,571        $ 13,983        $ 20,187        $14,579
  Annuity Rate and Expense
    Guarantees.....................      32,960          29,061           1,319           1,408           2,641          2,437
                                       --------        --------        --------        --------        --------        -------
  Net Investment Income (Loss).....     251,757         114,567          12,252          12,575          17,546         12,142
                                       --------        --------        --------        --------        --------        -------

REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS
  Realized Gain (Loss) on
    Investments....................      38,856          24,370          (4,630)             87             294            687
  Unrealized Appreciation
    (Depreciation) of Investments
    During the Period..............     (29,796)        248,726          (9,614)        (18,317)        (22,857)          (465)
                                       --------        --------        --------        --------        --------        -------
  Net Gain (Loss) on Investments...       9,060         273,096         (14,244)        (18,230)        (22,563)           222
                                       --------        --------        --------        --------        --------        -------
  Increase (Decrease) in Equity
    Derived from Investment
    Activity.......................    $260,817        $387,663        $ (1,992)       $ (5,655)       $ (5,017)       $12,364
                                       ========        ========        ========        ========        ========        =======
</TABLE>

# The initial investments in this Division was made on April 30, 1999.

    The Accompanying Notes are an Integral Part of the Financial Statements

Account B Financial Statements        B- 8
<PAGE>   32

<TABLE>
<CAPTION>
                                       RUSSELL              RUSSELL           RUSSELL            RUSSELL            RUSSELL
                                  MULTI-STYLE EQUITY   AGGRESSIVE EQUITY     NON-U.S.          REAL ESTATE         CORE BOND
     MONEY MARKET DIVISION            DIVISION#            DIVISION#        DIVISION #     SECURITIES DIVISION#    DIVISION #
-------------------------------   ------------------   -----------------   -------------   --------------------   ------------
                                     EIGHT MONTHS        EIGHT MONTHS      EIGHT MONTHS        EIGHT MONTHS       EIGHT MONTHS
     YEAR ENDED     YEAR ENDED          ENDED                ENDED             ENDED              ENDED              ENDED
    DECEMBER 31,   DECEMBER 31,      DECEMBER 31,        DECEMBER 31,      DECEMBER 31,        DECEMBER 31,       DECEMBER 31,
        1999           1998              1999                1999              1999                1999               1999
------------------------------------------------------------------------------------------------------------------------------
<S> <C>            <C>            <C>                  <C>                 <C>             <C>                    <C>
      $11,719         $8,478            $1,443              $   64            $  604              $ 249              $ 502
        2,547          1,809               135                  48                60                 22                 36
      -------         ------            ------              ------            ------              -----              -----
        9,172          6,669             1,308                  16               544                227                466
      -------         ------            ------              ------            ------              -----              -----

           --             --                --                 (17)              130                (62)                (1)
           --             --             1,788               1,221             2,706               (231)              (465)
      -------         ------            ------              ------            ------              -----              -----
           --             --             1,788               1,204             2,836               (293)              (466)
      -------         ------            ------              ------            ------              -----              -----
      $ 9,172         $6,669            $3,096              $1,220            $3,380              $ (66)             $  --
      =======         ======            ======              ======            ======              =====              =====
</TABLE>

                                      B- 9        Account B Financial Statements
<PAGE>   33

NML VARIABLE ANNUITY ACCOUNT B

<TABLE>
<CAPTION>
       Statement of Changes in Equity                                               SMALL CAP
               (in thousands)                                                      GROWTH STOCK           AGGRESSIVE GROWTH
                                                           COMBINED                 DIVISION#               STOCK DIVISION
                                                 ----------------------------      ------------      ----------------------------
                                                                                   EIGHT MONTHS
                                                  YEAR ENDED      YEAR ENDED          ENDED           YEAR ENDED      YEAR ENDED
                                                 DECEMBER 31,    DECEMBER 31,      DECEMBER 31,      DECEMBER 31,    DECEMBER 31,
                                                     1999            1998              1999              1999            1998
---------------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>             <C>               <C>               <C>             <C>
OPERATIONS
  Net Investment Income......................     $  449,331      $  212,059         $ 1,509          $   18,061      $  20,210
  Net Realized gain (loss)...................        206,068          88,924             152              59,354         27,122
  Net Change in unrealized appreciation
    (depreciation)...........................        384,910         521,055          11,180             227,531            650
                                                  ----------      ----------         -------          ----------      ---------
Increase (Decrease) in Equity................      1,040,309         822,038          12,841             304,946         47,982
                                                  ----------      ----------         -------          ----------      ---------

EQUITY TRANSACTIONS
  Contract Owners' Net Payments..............        836,316         804,374           5,800              62,382         94,566
  Annuity Payments...........................        (14,043)        (11,449)             (3)               (673)          (737)
  Surrenders and Other (net).................       (478,867)       (370,626)           (366)            (58,870)       (55,445)
  Transfers from Other Divisions or
    Sponsor..................................      1,766,343         812,385          38,489              64,476         57,046
  Transfers to Other Divisions or Sponsor....     (1,783,287)       (825,382)         (7,980)           (155,561)      (113,076)
                                                  ----------      ----------         -------          ----------      ---------
Increase (Decrease) in Equity Derived from
  Equity Transactions........................        326,462         409,302          35,940             (88,246)       (17,646)
                                                  ----------      ----------         -------          ----------      ---------
Net Increase (Decrease) in Equity............      1,366,771       1,231,340          48,781             216,700         30,336

EQUITY
  Beginning of Period........................      6,401,651       5,170,311              --             817,218        786,882
                                                  ----------      ----------         -------          ----------      ---------
  End of Period..............................     $7,768,422      $6,401,651         $48,781          $1,033,918      $ 817,218
                                                  ==========      ==========         =======          ==========      =========
</TABLE>

# The initial investment in this Division was made on April 30, 1999.

    The Accompanying Notes are an Integral Part of the Financial Statements

Account B Financial Statements       B- 10
<PAGE>   34
<TABLE>
<CAPTION>
                                     INDEX 400
                                       STOCK
    INTERNATIONAL EQUITY DIVISION    DIVISION#        GROWTH STOCK DIVISION
    -----------------------------   ------------   ---------------------------
                                    EIGHT MONTHS
     YEAR ENDED      YEAR ENDED        ENDED        YEAR ENDED     YEAR ENDED
    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
        1999            1998            1999           1999           1998
------------------------------------------------------------------------------
<S> <C>             <C>             <C>            <C>            <C>
      $  63,956       $  23,263       $   245        $  9,682       $  2,183
         78,270          17,380            14           2,979          1,471
        (44,084)        (24,915)        1,819          64,234         49,578
      ---------       ---------       -------        --------       --------
         98,142          15,728         2,078          76,895         53,232
      ---------       ---------       -------        --------       --------

         39,987          60,272         7,316          65,324         54,754
           (630)           (559)           (7)           (572)          (268)
        (33,344)        (33,875)         (323)        (23,057)       (12,505)
        396,413          56,567        19,597         111,147         56,084
       (449,369)       (102,582)       (4,217)        (59,550)       (28,461)
      ---------       ---------       -------        --------       --------

        (46,943)        (20,177)       22,366          93,292         69,604
      ---------       ---------       -------        --------       --------
         51,199          (4,449)       24,444         170,187        122,836

        487,983         492,432            --         300,246        177,410
      ---------       ---------       -------        --------       --------
      $ 539,182       $ 487,983       $24,444        $470,433       $300,246
      =========       =========       =======        ========       ========

<CAPTION>

           GROWTH & INCOME                  INDEX 500
           STOCK DIVISION                STOCK DIVISION
     ---------------------------   ---------------------------

      YEAR ENDED     YEAR ENDED     YEAR ENDED     YEAR ENDED
     DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
         1999           1998           1999           1998
---  ---------------------------------------------------------
<S>  <C>            <C>            <C>            <C>
       $ 46,514       $   (545)     $   16,076     $   20,995
          5,902          2,454          24,827         15,353
        (24,965)        67,034         206,443        198,764
       --------       --------      ----------     ----------
         27,451         68,943         247,346        235,112
       --------       --------      ----------     ----------
         59,687         73,068         167,133        152,424
           (868)          (642)         (2,567)        (1,910)
        (27,142)       (19,173)        (85,802)       (53,430)
         73,083         63,150         223,692        154,924
        (74,859)       (46,768)       (169,952)      (115,601)
       --------       --------      ----------     ----------
         29,901         69,635         132,504        136,407
       --------       --------      ----------     ----------
         57,352        138,578         379,850        371,519
        423,325        284,747       1,170,970        799,451
       --------       --------      ----------     ----------
       $480,677       $423,325      $1,550,820     $1,170,970
       ========       ========      ==========     ==========
</TABLE>

                                     B- 11        Account B Financial Statements
<PAGE>   35

NML VARIABLE ANNUITY ACCOUNT B

<TABLE>
<CAPTION>
  Statement of Changes in Equity
          (in thousands)
                                          BALANCED DIVISION            HIGH YIELD BOND DIVISION          SELECT BOND DIVISION
                                     ----------------------------    ----------------------------    ----------------------------
                                      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED      YEAR ENDED
                                     DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
            (CONTINUED)                  1999            1998            1999            1998            1999            1998
---------------------------------------------------------------------------------------------------------------------------------
<S>                                  <C>             <C>             <C>             <C>             <C>             <C>
OPERATIONS
  Net Investment Income............   $  251,757      $  114,567       $ 12,252        $ 12,575        $ 17,546        $ 12,142
  Net Realized gain (loss).........       38,856          24,370         (4,630)             87             294             687
  Net Change in unrealized
    appreciation (depreciation)....      (29,796)        248,726         (9,614)        (18,317)        (22,857)           (465)
                                      ----------      ----------       --------        --------        --------        --------
Increase (Decrease) in Equity
  Derived from Investment
  Activity.........................      260,817         387,663         (1,992)         (5,655)         (5,017)         12,364
                                      ----------      ----------       --------        --------        --------        --------

EQUITY TRANSACTIONS
  Contract Owners' Net Payments....      228,829         220,919         14,760          40,941          27,862          33,881
  Annuity Payments.................       (7,284)         (6,278)          (308)           (301)           (729)           (570)
  Surrenders and Other (net).......     (176,628)       (153,449)        (8,909)         (8,012)        (17,847)        (13,382)
  Transfers from Other Divisions or
    Sponsor........................      130,806         103,591         17,472          39,779          38,916          50,470
  Transfers to Other Divisions or
    Sponsor........................     (181,406)       (133,506)       (42,377)        (31,044)        (50,320)        (36,471)
                                      ----------      ----------       --------        --------        --------        --------
Increase (Decrease) in Equity
  Derived from Equity
  Transactions.....................       (5,683)         31,277        (19,362)         41,363          (2,118)         33,928
                                      ----------      ----------       --------        --------        --------        --------
Net Increase (Decrease) in
  Equity...........................      255,134         418,940        (21,354)         35,708          (7,135)         46,292

EQUITY
  Beginning of Period..............    2,621,697       2,202,757        136,369         100,661         238,257         191,965
                                      ----------      ----------       --------        --------        --------        --------
  End of Period....................   $2,876,831      $2,621,697       $115,015        $136,369        $231,122        $238,257
                                      ==========      ==========       ========        ========        ========        ========
</TABLE>

# The initial investment in this Division was made on April 30, 1999.

    The Accompanying Notes are an Integral Part of the Financial Statements

Account B Financial Statements       B- 12
<PAGE>   36

<TABLE>
<CAPTION>
                                       RUSSELL              RUSSELL          RUSSELL             RUSSELL             RUSSELL
                                  MULTI-STYLE EQUITY   AGGRESSIVE EQUITY     NON-U.S.     REAL ESTATE SECURITIES    CORE BOND
     MONEY MARKET DIVISION            DIVISION#            DIVISION#        DIVISION #          DIVISION#           DIVISION #
-------------------------------   ------------------   -----------------   ------------   ----------------------   ------------
                                     EIGHT MONTHS        EIGHT MONTHS      EIGHT MONTHS        EIGHT MONTHS        EIGHT MONTHS
     YEAR ENDED     YEAR ENDED          ENDED                ENDED            ENDED               ENDED               ENDED
    DECEMBER 31,   DECEMBER 31,      DECEMBER 31,        DECEMBER 31,      DECEMBER 31,        DECEMBER 31,        DECEMBER 31,
        1999           1998              1999                1999              1999                1999                1999
-------------------------------------------------------------------------------------------------------------------------------
<S> <C>            <C>            <C>                  <C>                 <C>            <C>                      <C>
     $   9,172      $   6,669          $ 1,308              $    16          $   544              $  227             $   466
            --             --               --                  (17)             130                 (62)                 (1)
            --             --            1,788                1,221            2,706                (231)               (465)
     ---------      ---------          -------              -------          -------              ------             -------
         9,172          6,669            3,096                1,220            3,380                 (66)                 --
     ---------      ---------          -------              -------          -------              ------             -------

       122,518         73,549           16,904                4,683            5,356               2,060               5,715
          (359)          (184)             (24)                  (3)              (6)                 (2)                 (8)
       (46,116)       (21,355)            (279)                 (12)               8                 (96)                (84)
       568,077        230,774           33,711               11,989           21,654               6,530              10,291
      (570,187)      (217,873)          (4,479)              (1,531)          (7,493)             (1,760)             (2,246)
     ---------      ---------          -------              -------          -------              ------             -------
        73,933         64,911           45,833               15,126           19,519               6,732              13,668
     ---------      ---------          -------              -------          -------              ------             -------
        83,105         71,580           48,929               16,346           22,899               6,666              13,668

       205,586        134,006               --                   --               --                  --                  --
     ---------      ---------          -------              -------          -------              ------             -------
     $ 288,691      $ 205,586          $48,929              $16,346          $22,899              $6,666             $13,668
     =========      =========          =======              =======          =======              ======             =======
</TABLE>

                                     B- 13        Account B Financial Statements
<PAGE>   37

NML VARIABLE ANNUITY ACCOUNT B
Notes to Financial Statements
December 31, 1999

NOTE 1 -- NML Variable Annuity Account B (the "Account") is registered as a unit
investment trust under the Investment Company Act of 1940 and is a segregated
asset account of The Northwestern Mutual Life Insurance Company ("Northwestern
Mutual" or "Sponsor") used to fund variable annuity contracts ("contracts") for
tax-deferred annuities, individual retirement annuities and non-qualified plans.
Beginning March 31, 1995, two versions of the contract are offered: Front Load
contracts with a sales charge up to 4% of purchase payments and Back Load
contracts with a withdrawal charge of 0-8%.

NOTE 2 -- The preparation of the 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 reported
period. Actual results could differ from those estimates. Principal accounting
policies are summarized below.

NOTE 3 -- All assets of each Division of the Account are invested in shares of
the corresponding Portfolio of Northwestern Mutual Series Fund, Inc. and the
Russell Insurance Funds (collectively known as "the Funds"). The shares are
valued at the Funds' offering and redemption prices per share.

The Funds are open-end investment companies registered under the Investment
Company Act of 1940.

NOTE 4 -- Annuity reserves are based on published annuity tables with age
adjustment and benefit payments which reflect actual investment experience. For
variable payment plans issued prior to January 1, 1974, annuity reserves are
based on the 1955 American Annuity Table with assumed interest rates of 3% or
5%. For variable payment plans issued on or after January 1, 1974 and before
January 1, 1985, annuity reserves are based on the 1971 Individual Annuity Table
with assumed interest rates of 3 1/2% or 5%. For variable payment plans issued
on or after January 1, 1985, annuity reserves are based on the 1983 Table a with
assumed interest rates of 3 1/2% or 5%.

NOTE 5 -- Dividend income from the Funds is recorded on the record date of the
dividends. Transactions in Funds shares are accounted for on the trade date. The
basis for determining cost on sale of the Fund shares is identified cost.
Purchases and sales of the Funds shares for the period ended December 31, 1999
by each Division are shown below:

<TABLE>
<CAPTION>
       DIVISIONS             PURCHASES         SALES
       ---------             ---------         -----
<S>                         <C>             <C>
Small Cap Growth
  Stock.................    $ 38,296,546    $    845,567
Aggressive Growth
  Stock.................      34,771,762     104,562,461
International Equity....     384,796,045     367,729,044
Index 400 Stock.........      23,338,058         724,505
Growth Stock............     108,687,411       5,055,604
Growth & Income Stock...      95,275,712      18,290,526
Index 500 Stock.........     182,480,585      33,272,697
Balanced................     353,238,684     105,669,410
High Yield Bond.........      17,862,405      24,902,416
Select Bond.............      38,088,064      22,743,183
Money Market............     442,385,056     359,078,119
Russell Multi-Style
  Equity Fund...........      47,166,840          18,127
Russell Aggressive
  Equity Fund...........      15,399,751         250,029
Russell Non-U.S. Fund...      21,739,048       1,672,878
Russell Real Estate
  Securities Fund.......       7,618,762         659,336
Russell Core Bond
  Fund..................      14,168,221          31,074
</TABLE>

NOTE 6 -- A deduction for annuity rate and expense guarantees is determined
daily and paid to Northwestern Mutual as compensation for assuming the risk that
annuity payments will continue for longer periods than anticipated because the
annuitants as a group live longer than expected, and the risk that the charges
made by Northwestern Mutual may be insufficient to cover the actual costs
incurred in connection with the contracts.

For contracts issued on or after March 31, 1995, for the Front Load version and
the Back Load version, the deduction for annuity rate and expense guarantees is
determined daily at annual rates of 4/10 of 1% and 1 1/4%, respectively, of the
net assets of each Division attributable to these contracts and is paid to
Northwestern Mutual. For these contracts, the rates may be increased or
decreased by the Board of Trustees of Northwestern Mutual not to exceed 3/4 of
1% and 1 1/2% annual rate, respectively.

For contracts issued after December 16, 1981 and prior to March 31, 1995, the
deduction is at an annual rate of 1 1/4% of the net assets of each Division
attributable to these contracts.

Notes to Financial Statements        B- 14
<PAGE>   38

For these contracts, the rate may be increased or decreased by the Board of
Trustees of Northwestern Mutual not to exceed a 1 1/2% annual rate.

For contracts issued prior to December 17, 1981, the deduction is at an annual
rate of 3/4 of 1% of the net assets of each Division attributable to these
contracts. For these contracts, the rate may be increased or decreased by the
Board of Trustees of Northwestern Mutual not to exceed a 1% annual rate.

Since 1995, Northwestern Mutual has paid a dividend to certain contracts. The
dividend is re-invested in the Account and has been reflected as a Contract
Owners' Net Deposit in the accompanying financial statements.

NOTE 7 -- Northwestern Mutual is taxed as a "life insurance company" under the
Internal Revenue Code and the operations of the Account form a part of and are
taxed with those of Northwestern Mutual. Under current law, no federal income
taxes are payable with respect to the Account. Accordingly, no provision for any
such liability has been made.

                                     B- 15         Notes to Financial Statements
<PAGE>   39

NML VARIABLE ANNUITY ACCOUNT B
Notes to Financial Statements
December 31, 1999
(in thousands)

NOTE 8 -- Equity Values by Division are shown below:

<TABLE>
<CAPTION>
                                                                                                   CONTRACTS ISSUED:
                                                       CONTRACTS ISSUED:                      AFTER DECEMBER 16, 1981 AND
                                                  PRIOR TO DECEMBER 17, 1981                    PRIOR TO MARCH 31, 1995
                                            ---------------------------------------    -----------------------------------------
                                            ACCUMULATION       UNITS                   ACCUMULATION       UNITS
                DIVISION                     UNIT VALUE     OUTSTANDING     EQUITY      UNIT VALUE     OUTSTANDING      EQUITY
--------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>             <C>            <C>         <C>             <C>            <C>
Small Cap Growth Stock..................     $1.851783           215       $    398     $1.845580         13,315      $   24,574
Aggressive Growth Stock.................      5.679928           987          5,606      5.427804        118,954         645,659
International Equity....................      2.375600         1,529          3,632      2.297694        143,591         329,928
Index 400 Stock.........................      1.122676            66             74      1.118909          7,870           8,806
Growth Stock............................      3.099518           595          1,844      3.012947         66,688         200,927
Growth and Income Stock.................      2.600855           645          1,678      2.528256         83,677         211,557
Index 500 Stock.........................      5.146736         9,856         50,727      4.918509        165,311         813,084
Balanced................................      8.176347         5,216         42,649      7.473141        281,204       2,101,477
High Yield Bond.........................      1.563339           128            200      1.519653         25,580          38,873
Select Bond.............................      7.656679           844          6,462      6.996057         17,091         119,570
Money Market............................      2.767058         1,360          3,763      2.528768         52,169         131,923
Russell Multi-Style Equity..............      1.070614           244            261      1.067018         14,784          15,775
Russell Aggressive Equity...............      1.103591           108            119      1.099895          6,268           6,894
Russell Non-U.S. .......................      1.247160            34             42      1.242993          7,403           9,202
Russell Real Estate Securities..........      0.922768             2              2      0.919674          2,244           2,064
Russell Core Bond.......................      0.986452             2              2      0.983142          3,415           3,357
                                                                           --------                                   ----------
  Equity................................                                    117,459                                    4,663,670
  Annuity Reserves......................                                      5,907                                       76,161
                                                                           --------                                   ----------
  Total Equity..........................                                   $123,366                                   $4,739,831
                                                                           ========                                   ==========
</TABLE>

<TABLE>
<CAPTION>
                                                       CONTRACTS ISSUED:                           CONTRACTS ISSUED:
                                                  ON OR AFTER MARCH 31, 1995                  ON OR AFTER MARCH 31, 1995
                                                      FRONT LOAD VERSION                           BACK LOAD VERSION
                                            ---------------------------------------    -----------------------------------------
                                            ACCUMULATION       UNITS                   ACCUMULATION       UNITS
                DIVISION                     UNIT VALUE     OUTSTANDING     EQUITY      UNIT VALUE     OUTSTANDING      EQUITY
--------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>             <C>            <C>         <C>             <C>            <C>
Small Cap Growth Stock..................     $1.856086         5,929       $ 11,005     $1.845580          6,829      $   12,603
Aggressive Growth Stock.................      2.661899        38,181        101,634      5.427804         50,370         273,398
International Equity....................      1.964300        32,351         63,547      2.297694         59,168         135,950
Index 400 Stock.........................      1.125296         6,253          7,036      1.118909          7,577           8,478
Growth Stock............................      2.898070        29,613         85,821      3.012947         58,031         174,844
Growth and Income Stock.................      2.431081        34,269         83,311      2.528256         69,826         176,538
Index 500 Stock.........................      3.127888        64,985        203,266      4.918509         93,537         460,064
Balanced................................      2.117903       102,079        216,192      7.473141         60,554         452,529
High Yield Bond.........................      1.483036        17,636         26,155      1.519653         31,364          47,662
Select Bond.............................      1.331215        29,870         39,763      6.996057          8,674          60,684
Money Market............................      1.259407        57,765         72,750      2.528768         30,819          77,934
Russell Multi-Style Equity..............      1.073107        14,702         15,777      1.067018         15,269          16,292
Russell Aggressive Equity...............      1.106159         4,174          4,617      1.099895          4,194           4,613
Russell Non-U.S.........................      1.250059         5,811          7,264      1.242993          4,937           6,137
Russell Real Estate Securities..........      0.924920         2,829          2,617      0.919674          2,073           1,906
Russell Core Bond.......................      0.988747         5,501          5,439      0.983142          4,595           4,518
                                                                           --------                                   ----------
  Equity................................                                    946,194                                    1,914,150
  Annuity Reserves......................                                     10,174                                       34,707
                                                                           --------                                   ----------
  Total Equity..........................                                   $956,368                                   $1,948,857
                                                                           ========                                   ==========
</TABLE>

Notes to Financial Statements        B- 16
<PAGE>   40

[PRICEWATERHOUSECOOPERS LETTERHEAD]

Report of Independent Accountants

To The Northwestern Mutual Life Insurance Company and
Contract Owners of NML Variable Annuity Account B

In our opinion, the accompanying combined statement of assets and liabilities
and the related combined and separate statements of operations and of changes in
equity present fairly, in all material respects, the financial position of NML
Variable Annuity Account B and the Small Cap Growth Stock Division, Aggressive
Growth Stock Division, International Equity Division, Index 400 Stock Division,
Growth Stock Division, Growth & Income Stock Division, Index 500 Stock Division,
Balanced Division, High Yield Bond Division, Select Bond Division, Money Market
Division, Russell Multi-Style Equity Division, Russell Aggressive Equity
Division, Russell Non-U.S. Division, Russell Real Estate Securities Division and
Russell Core Bond Division thereof at December 31, 1999, the results of each of
their operations for each of the two years on the period then ended and the
changes in each of their equity for the two years or the period then ended in
conformity with accounting principles generally accepted in the United States.
These financial statements are the responsibility of The Northwestern Mutual
Life Insurance Company'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 auditing standards generally
accepted in the United States 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 direct confirmation of the number of shares owned at
December 31, 1999 with Northwestern Mutual Series Fund, Inc. and the Russell
Insurance Funds, provide a reasonable basis for the opinion expressed above.

[PRICEWATERHOUSECOOPERS LLP]

Milwaukee, Wisconsin
January 27, 2000

                                     B- 17                   Accountants' Report
<PAGE>   41

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
Consolidated Statement of Financial Position
(in millions)

The following financial statements of Northwestern Mutual should be considered
only as bearing upon the ability of Northwestern Mutual Life to meet its
obligations under the Policies.

<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                                ---------------------
                                                                 1999          1998
-------------------------------------------------------------------------------------
<S>                                                             <C>           <C>
ASSETS
  Bonds.....................................................    $36,792       $34,888
  Common and preferred stocks...............................      7,108         6,062
  Mortgage loans............................................     13,416        12,250
  Real estate...............................................      1,666         1,481
  Policy loans..............................................      7,938         7,580
  Other investments.........................................      3,443         2,353
  Cash and temporary investments............................      1,159         1,275
                                                                -------       -------
    TOTAL INVESTMENTS.......................................     71,522        65,889
  Due and accrued investment income.........................        893           827
  Other assets..............................................      1,409         1,313
  Separate account assets...................................     12,161         9,966
                                                                -------       -------
    TOTAL ASSETS............................................    $85,985       $77,995
                                                                =======       =======
LIABILITIES AND SURPLUS
  Reserves for policy benefits..............................    $56,246       $51,815
  Policy benefit and premium deposits.......................      1,746         1,709
  Policyowner dividends payable.............................      3,100         2,870
  Interest maintenance reserve..............................        491           606
  Asset valuation reserve...................................      2,371         1,994
  Income taxes payable......................................      1,192         1,161
  Other liabilities.........................................      3,609         3,133
  Separate account liabilities..............................     12,161         9,966
                                                                -------       -------
    TOTAL LIABILITIES.......................................     80,916        73,254
  Surplus...................................................      5,069         4,741
                                                                -------       -------
    TOTAL LIABILITIES AND SURPLUS...........................    $85,985       $77,995
                                                                =======       =======
</TABLE>

   The Accompanying Notes are an Integral Part of these Financial Statements

Consolidated Statement of Financial Position
                                     B- 18
<PAGE>   42

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
Consolidated Statement of Operations
(in millions)

<TABLE>
<CAPTION>
                                                              FOR THE YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                               1999        1998        1997
---------------------------------------------------------------------------------------------
<S>                                                           <C>         <C>         <C>
REVENUE
  Premiums and deposits.....................................  $ 8,344     $ 8,021     $ 7,294
  Net investment income.....................................    4,766       4,536       4,171
  Other income..............................................      970         922         861
                                                              -------     -------     -------
      TOTAL REVENUE.........................................   14,080      13,479      12,326
                                                              -------     -------     -------
BENEFITS AND EXPENSES
  Benefit payments to policyowners and beneficiaries........    4,023       3,602       3,329
  Net additions to policy benefit reserves..................    4,469       4,521       4,026
  Net transfers to separate accounts........................      516         564         566
                                                              -------     -------     -------
      TOTAL BENEFITS........................................    9,008       8,687       7,921
  Operating expenses........................................    1,287       1,297       1,138
                                                              -------     -------     -------
      TOTAL BENEFITS AND EXPENSES...........................   10,295       9,984       9,059
                                                              -------     -------     -------
      GAIN FROM OPERATIONS BEFORE DIVIDENDS AND TAXES.......    3,785       3,495       3,267
Policyowner dividends.......................................    3,091       2,869       2,636
                                                              -------     -------     -------
      GAIN FROM OPERATIONS BEFORE TAXES.....................      694         626         631
Income tax expense..........................................      203         301         356
                                                              -------     -------     -------
      NET GAIN FROM OPERATIONS..............................      491         325         275
Net realized capital gains..................................      846         484         414
                                                              -------     -------     -------
      NET INCOME............................................  $ 1,337     $   809     $   689
                                                              =======     =======     =======
</TABLE>

   The Accompanying Notes are an Integral Part of these Financial Statements

                                     B- 19  Consolidated Statement of Operations
<PAGE>   43

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
Consolidated Statement of Changes in Surplus
(in millions)

<TABLE>
<CAPTION>
                                                                       FOR THE YEAR ENDED
                                                                          DECEMBER 31,
                                                                --------------------------------
                                                                 1999         1998         1997
------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>          <C>
BEGINNING OF YEAR...........................................    $4,741       $4,101       $3,515
  Net income................................................     1,337          809          689
  Increase (decrease) in net unrealized gains...............       213         (147)         576
  Increase in investment reserves...........................      (377)         (20)        (526)
  Charge-off of goodwill (Note 7)...........................      (842)          --           --
  Other, net................................................        (3)          (2)        (153)
                                                                ------       ------       ------
  NET INCREASE IN SURPLUS...................................       328          640          586
                                                                ------       ------       ------
END OF YEAR BALANCE.........................................    $5,069       $4,741       $4,101
                                                                ======       ======       ======
</TABLE>

   The Accompanying Notes are an Integral Part of these Financial Statements

Consolidated Statement of Changes in Surplus
                                     B- 20
<PAGE>   44

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
Consolidated Statement of Cash Flows
(in millions)

<TABLE>
<CAPTION>
                                                                  FOR THE YEAR ENDED DECEMBER 31,
                                                                -----------------------------------
                                                                 1999          1998          1997
---------------------------------------------------------------------------------------------------
<S>                                                             <C>           <C>           <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Insurance and annuity premiums............................    $ 9,260       $ 8,876       $ 8,093
  Investment income received................................      4,476         4,216         3,928
  Disbursement of policy loans, net of repayments...........       (358)         (416)         (360)
  Benefits paid to policyowners and beneficiaries...........     (4,012)       (3,572)       (3,316)
  Net transfers to separate accounts........................       (516)         (564)         (565)
  Policyowner dividends paid................................     (2,862)       (2,639)       (2,347)
  Operating expenses and taxes..............................     (1,699)       (1,749)       (1,722)
  Other, net................................................        (56)          (83)          124
                                                                -------       -------       -------
       NET CASH PROVIDED BY OPERATING ACTIVITIES............      4,233         4,069         3,835
                                                                -------       -------       -------
CASH FLOWS FROM INVESTING ACTIVITIES
  PROCEEDS FROM INVESTMENTS SOLD OR MATURED
     Bonds..................................................     20,788        28,720        38,284
     Common and preferred stocks............................     13,331        10,359         9,057
     Mortgage loans.........................................      1,356         1,737         1,012
     Real estate............................................        216           159           302
     Other investments......................................        830           768           398
                                                                -------       -------       -------
                                                                 36,521        41,743        49,053
                                                                -------       -------       -------
  COST OF INVESTMENTS ACQUIRED
     Bonds..................................................     22,849        30,873        41,169
     Common and preferred stocks............................     13,794         9,642         9,848
     Mortgage loans.........................................      2,500         3,135         2,309
     Real estate............................................        362           268           202
     Other investments......................................      1,864           567           359
                                                                -------       -------       -------
                                                                 41,369        44,485        53,887
                                                                -------       -------       -------
  Net increase (decrease) in securities lending and other...        499          (624)          440
                                                                -------       -------       -------
       NET CASH USED IN INVESTING ACTIVITIES................     (4,349)       (3,366)       (4,394)
                                                                -------       -------       -------
       NET (DECREASE) INCREASE IN CASH AND TEMPORARY
        INVESTMENTS.........................................       (116)          703          (559)
Cash and temporary investments, beginning of year...........      1,275           572         1,131
                                                                -------       -------       -------
Cash and temporary investments, end of year.................    $ 1,159       $ 1,275       $   572
                                                                =======       =======       =======
</TABLE>

   The Accompanying Notes are an Integral Part of these Financial Statements

                                     B- 21  Consolidated Statement of Cash Flows
<PAGE>   45

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
Notes to Consolidated Statutory Financial Statements
December 31, 1999, 1998 and 1997

NOTE 1 -- BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The accompanying consolidated statutory financial statements include the
accounts of The Northwestern Mutual Life Insurance Company ("Company") and its
wholly-owned subsidiary, Northwestern Long Term Care Insurance Company
("Subsidiary"). The Company and its Subsidiary offer life, annuity, disability
income and long-term care products to the personal, business, estate and
tax-qualified markets.

The consolidated financial statements have been prepared using accounting
policies prescribed or permitted by the Office of the Commissioner of Insurance
of the State of Wisconsin ("statutory basis of accounting").

In 1998, the National Association of Insurance Commissioners ("NAIC") adopted
the Codification of Statutory Accounting Principles ("Codification") guidance,
which will replace the current Accounting Practices and Procedures manual as the
NAIC's primary guidance on statutory accounting. The NAIC is now considering
amendments to Codification that would also be effective upon implementation.
Codification provides guidance for areas where statutory accounting has been
silent and changes current statutory accounting in some areas (e.g., deferred
income taxes are recorded). The Office of the Commissioner of Insurance of the
State of Wisconsin ("OCI") intends to adopt Codification effective January 1,
2001. The Company has not determined the potential effect of Codification, and
the eventual effect of adoption could differ if changes are made prior to the
effective date of January 1, 2001.

Financial statements prepared on the statutory basis of accounting vary from
financial statements prepared on the basis of generally accepted accounting
principles ("GAAP") primarily because on a GAAP basis: (1) policy acquisition
costs are deferred and amortized, (2) investment valuations and insurance
reserves are based on different assumptions, (3) funds received under
deposit-type contracts are not reported as premium revenue, and (4) deferred
taxes are provided for temporary differences between book and tax basis of
certain assets and liabilities. The effects on the financial statements of the
differences between the statutory basis of accounting and GAAP are material to
the Company.

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

INVESTMENTS

The Company's investments are valued on the following bases:

Bonds -- Amortized cost using the interest method; loan-backed and structured
securities are amortized using estimated prepayment rates and, generally, the
prospective adjustment method

Common and preferred stocks -- Common stocks are carried at fair value,
preferred stocks are generally carried at cost, and unconsolidated subsidiaries
are recorded using the equity method

Mortgage loans -- Amortized cost

Real estate -- Lower of cost, less depreciation and encumbrances, or estimated
net realizable value

Policy loans -- Unpaid principal balance, which approximates fair value

Other investments -- Consists primarily of joint venture investments which are
valued at equity in ventures' net assets

Cash and temporary investments -- Amortized cost, which approximates fair value

TEMPORARY INVESTMENTS

Temporary investments consist of debt securities that have maturities of one
year or less at acquisition.

NET INVESTMENT INCOME AND CAPITAL GAINS

Net investment income includes interest and dividends received or due and
accrued on investments, equity in unconsolidated subsidiaries' earnings and the
Company's share of joint venture income. Net investment income is reduced by
investment management expenses, real estate depreciation, depletion related to
energy assets and costs associated with securities lending.

Realized investment gains and losses are reported in income based upon specific
identification of securities sold. Unrealized investment gains and losses
include changes in the fair

Notes to Consolidated Statutory Financial Statements
                                     B- 22
<PAGE>   46

value of common stocks and changes in valuation allowances made for bonds,
preferred stocks, mortgage loans and other investments considered by management
to be impaired.

INTEREST MAINTENANCE RESERVE

The Company is required to maintain an interest maintenance reserve ("IMR"). The
IMR is used to defer realized gains and losses, net of tax, on fixed income
investments resulting from changes in interest rates. Net realized gains and
losses deferred to the IMR are amortized into investment income over the
approximate remaining term to maturity of the investment sold.

INVESTMENT RESERVES

The Company is required to maintain an asset valuation reserve ("AVR"). The AVR
establishes a general reserve for invested asset valuation using a formula
prescribed by state regulations. The AVR is designed to stabilize surplus
against potential declines in the value of investments. In addition, the Company
maintained a $200 million voluntary investment reserve at each of December 31,
1999 and 1998 to absorb potential investment losses exceeding those considered
by the AVR formula. Increases or decreases in these investment reserves are
recorded directly to surplus.

SEPARATE ACCOUNTS

Separate account assets and related policy liabilities represent the segregation
of funds deposited by "variable" life insurance and annuity policyowners.
Policyowners bear the investment performance risk associated with variable
products. Separate account assets are invested at the direction of the
policyowner in a variety of Company-managed mutual funds. Variable product
policyowners also have the option to invest in a fixed interest rate annuity in
the general account of the Company. Separate account assets are reported at fair
value.

PREMIUM REVENUE AND OPERATING EXPENSES

Life insurance premiums are recognized as revenue at the beginning of each
policy year. Annuity and disability income premiums are recognized when received
by the Company. Operating expenses, including costs of acquiring new policies,
are charged to operations as incurred.

OTHER INCOME

Other income includes considerations on supplementary contracts, ceded
reinsurance expense allowances and miscellaneous policy charges.

BENEFIT PAYMENTS TO POLICYOWNERS AND BENEFICIARIES

Benefit payments to policyowners and beneficiaries include death, surrender and
disability benefits, matured endowments and supplementary contract payments.

RESERVES FOR POLICY BENEFITS

Reserves for policy benefits are determined using actuarial estimates based on
mortality and morbidity experience tables and valuation interest rates
prescribed by the OCI. (See Note 3.)

POLICYOWNER DIVIDENDS

Almost all life insurance policies, and certain annuity and disability income
policies issued by the Company are participating. Annually, the Company's Board
of Trustees approves dividends payable on participating policies in the
following fiscal year, which are accrued and charged to operations when
approved.

RECLASSIFICATION

Certain financial statement balances for 1998 and 1997 have been reclassified to
conform to the current year presentation.

                            Notes to Consolidated Statutory Financial Statements
                                     B- 23
<PAGE>   47

NOTE 2 -- INVESTMENTS

DEBT SECURITIES

Debt securities consist of all bonds and fixed-maturity preferred stocks. The
estimated fair values of debt securities are based upon quoted market prices, if
available. For securities not actively traded, fair values are estimated using
independent pricing services or internally developed pricing models.
Statement value, which principally represents amortized cost, and estimated fair
value of the Company's debt securities at December 31, 1999 and 1998 were as
follows:

<TABLE>
<CAPTION>
                           RECONCILIATION TO ESTIMATED FAIR VALUE
                       -----------------------------------------------
                                     GROSS        GROSS      ESTIMATED
                       STATEMENT   UNREALIZED   UNREALIZED     FAIR
  DECEMBER 31, 1999      VALUE       GAINS        LOSSES       VALUE
  -----------------    ---------   ----------   ----------   ---------
                                        (IN MILLIONS)
<S>                    <C>         <C>          <C>          <C>
U.S. Government and
  political
  obligations........   $ 3,855      $   72      $  (167)     $ 3,760
Mortgage-backed
  securities.........     7,736          65         (256)       7,545
Corporate and other
  debt securities....    25,201         249       (1,088)      24,362
                        -------      ------      -------      -------
                         36,792         386       (1,511)      35,667
Preferred stocks.....        85           2           --           87
                        -------      ------      -------      -------
     Total...........   $36,877      $  388      $(1,511)     $35,754
                        =======      ======      =======      =======
</TABLE>

<TABLE>
<CAPTION>
                           RECONCILIATION TO ESTIMATED FAIR VALUE
                       -----------------------------------------------
                                     GROSS        GROSS      ESTIMATED
                       STATEMENT   UNREALIZED   UNREALIZED     FAIR
  DECEMBER 31, 1998      VALUE       GAINS        LOSSES       VALUE
  -----------------    ---------   ----------   ----------   ---------
                                        (IN MILLIONS)
<S>                    <C>         <C>          <C>          <C>
U.S. Government and
  political
  obligations........   $ 3,904      $  461      $   (11)     $ 4,354
Mortgage-backed
  securities.........     7,357         280          (15)       7,622
Corporate and other
  debt securities....    23,627       1,240         (382)      24,485
                        -------      ------      -------      -------
                         34,888       1,981         (408)      36,461
Preferred stocks.....       189           4           (1)         192
                        -------      ------      -------      -------
     Total...........   $35,077      $1,985      $  (409)     $36,653
                        =======      ======      =======      =======
</TABLE>

The statement value and estimated fair value of debt securities by contractual
maturity at December 31, 1999 is shown below. Expected maturities may differ
from contractual maturities because borrowers may have the right to call or
prepay obligations with or without call or prepayment penalties.

<TABLE>
<CAPTION>
                                   STATEMENT    ESTIMATED
                                     VALUE      FAIR VALUE
                                   ---------    ----------
                                        (IN MILLIONS)
<S>                                <C>          <C>
Due in one year or less..........   $   931      $   942
Due after one year through five
  years..........................     5,420        5,412
Due after five years through ten
  years..........................    11,168       10,796
Due after ten years..............    11,622       11,059
                                    -------      -------
                                     29,141       28,209
Mortgage-backed securities.......     7,736        7,545
                                    -------      -------
                                    $36,877      $35,754
                                    =======      =======
</TABLE>

STOCKS

The estimated fair values of common and perpetual preferred stocks are based
upon quoted market prices, if available. For securities not actively traded,
fair values are estimated using independent pricing services or internally
developed pricing models.

The adjusted cost of common and preferred stock held by the Company at December
31, 1999 and 1998 was $4.9 billion and $4.3 billion, respectively.

MORTGAGE LOANS AND REAL ESTATE

Mortgage loans are collateralized by properties located throughout the United
States and Canada. The Company attempts to minimize mortgage loan investment
risk by diversification of geographic locations and types of collateral
properties.

The fair value of mortgage loans as of December 31, 1999 and 1998 was $13.2
billion and $12.9 billion, respectively. The fair value of the mortgage loan
portfolio is estimated by discounting the future estimated cash flows using
current interest rates of debt securities with similar credit risk and
maturities, or utilizing net realizable values.

At December 31, 1999 and 1998, real estate includes $39 million and $61 million,
respectively, acquired through foreclosure and $114 million and $120 million,
respectively, of home office real estate.

Notes to Consolidated Statutory Financial Statements
                                     B- 24
<PAGE>   48

REALIZED AND UNREALIZED GAINS AND LOSSES

Realized investment gains and losses for the years ended December 31, 1999, 1998
and 1997 were as follows:

<TABLE>
<CAPTION>
                                     FOR THE YEAR ENDED
                                     DECEMBER 31, 1999
                              --------------------------------
                                                        NET
                                                      REALIZED
                              REALIZED    REALIZED     GAINS
                               GAINS       LOSSES     (LOSSES)
                              --------    --------    --------
                                       (IN MILLIONS)
<S>                           <C>         <C>         <C>
Bonds.....................     $  219      $(404)      $ (185)
Common and preferred
  stocks..................      1,270       (255)       1,015
Mortgage loans............         22        (12)          10
Real estate...............         92         --           92
Other invested assets.....        308       (189)         119
                               ------      -----       ------
                               $1,911      $(860)       1,051
                               ======      =====       ------
Less: Capital gains
  taxes...................                                244
Less: IMR (losses)
  gains...................                                (39)
                                                       ------
Net realized capital
  gains...................                             $  846
                                                       ======
</TABLE>

<TABLE>
<CAPTION>
                                     FOR THE YEAR ENDED
                                     DECEMBER 31, 1998
                              --------------------------------
                                                        NET
                                                      REALIZED
                              REALIZED    REALIZED     GAINS
                               GAINS       LOSSES     (LOSSES)
                              --------    --------    --------
                                       (IN MILLIONS)
<S>                           <C>         <C>         <C>
Bonds.....................     $  514      $(231)      $  283
Common and preferred
  stocks..................        885       (240)         645
Mortgage loans............         18        (11)           7
Real estate...............         41         --           41
Other invested assets.....        330       (267)          63
                               ------      -----       ------
                               $1,788      $(749)       1,039
                               ======      =====       ------
Less: Capital gains
  taxes...................                                358
Less: IMR (losses)
  gains...................                                197
                                                       ------
Net realized capital
  gains...................                             $  484
                                                       ======
</TABLE>

<TABLE>
<CAPTION>
                                     FOR THE YEAR ENDED
                                     DECEMBER 31, 1997
                              --------------------------------
                                                        NET
                                                      REALIZED
                              REALIZED    REALIZED     GAINS
                               GAINS       LOSSES     (LOSSES)
                              --------    --------    --------
                                       (IN MILLIONS)
<S>                           <C>         <C>         <C>
Bonds.....................     $  518      $(269)       $249
Common and preferred
  stocks..................        533       (150)        383
Mortgage loans............         14        (14)         --
Real estate...............        100         (2)         98
Other invested assets.....        338       (105)        233
                               ------      -----        ----
                               $1,503      $(540)        963
                               ======      =====        ----
Less: Capital gains
  taxes...................                               340
Less: IMR (losses)
  gains...................                               209
                                                        ----
Net realized capital
  gains...................                              $414
                                                        ====
</TABLE>

Changes in unrealized net investment gains and losses for the years ended
December 31, 1999, 1998 and 1997 were as follows:

<TABLE>
<CAPTION>
                                    FOR THE YEAR ENDED
                                       DECEMBER 31,
                                  ----------------------
                                  1999     1998     1997
                                  ----     ----     ----
                                      (IN MILLIONS)
<S>                               <C>      <C>      <C>
Bonds.........................    $(178)   $ (97)   $ 43
Common and preferred stocks...      415       29     528
Mortgage loans................      (10)     (16)     (7)
Real estate...................       (2)      --      --
Other.........................      (12)     (63)     12
                                  -----    -----    ----
                                  $ 213    $(147)   $576
                                  =====    =====    ====
</TABLE>

SECURITIES LENDING

The Company has entered into securities lending agreements whereby certain
securities are loaned to third parties, primarily major brokerage firms. The
Company's policy requires a minimum of 102% of the fair value of the loaned
securities as collateral, calculated on a daily basis in the form of either cash
or securities. Collateral assets received and related liability due to
counterparties of $2.1 billion and $1.5 billion, respectively, are included in
the consolidated statements of financial position at December 31, 1999 and 1998,
and approximate the statement value of securities loaned at those dates.

INVESTMENT IN MGIC

The Company owns 11.3% (11.9 million shares) of the outstanding common stock of
MGIC Investment Corporation ("MGIC"). This investment is accounted for using the
equity method. At December 31, 1999 and 1998, the fair value of the Company's
investment in MGIC exceeded the statement value of $201 million and $180
million, respectively, by $518 million and $296 million, respectively.

In August 1998, the Company delivered 8.9 million shares of MGIC to a brokerage
firm to settle a forward contract. In conjunction with the settlement, the
Company recorded a $114 million realized gain.

DERIVATIVE FINANCIAL INSTRUMENTS

In the normal course of business, the Company enters into transactions to reduce
its exposure to fluctuations in interest rates, foreign currency exchange rates
and market volatility. These hedging strategies include the use of forwards,
futures, options and swaps.

                            Notes to Consolidated Statutory Financial Statements
                                     B- 25
<PAGE>   49

The Company held the following positions for hedging purposes at December 31,
1999 and 1998:

<TABLE>
<CAPTION>
                                                NOTIONAL AMOUNTS
                                           ---------------------------
                                           DECEMBER 31,   DECEMBER 31,
     DERIVATIVE FINANCIAL INSTRUMENT           1999           1998                     RISKS REDUCED
     -------------------------------       ------------   ------------                 -------------
                                                  (IN MILLIONS)
<S>                                        <C>            <C>            <C>
Foreign Currency
  Forward Contracts......................      $967           $601       Currency exposure on foreign-denominated
                                                                         investments
Common Stock Futures.....................       620            657       Stock market price fluctuation.
Bond Futures.............................        50            379       Bond market price fluctuation.
Options to acquire Interest Rate Swaps...       419            419       Interest rates payable on certain annuity
                                                                         and insurance contracts.
Foreign Currency and
  Interest Rate Swaps....................       203             94       Interest rates on variable rate notes and
                                                                         currency exposure on foreign-denominated
                                                                         bonds.
Default Swaps............................        52             --       Default exposure on certain bond
                                                                         investments.
</TABLE>

The notional or contractual amounts of derivative financial instruments are used
to denominate these types of transactions and do not represent the amounts
exchanged between the parties.

In addition to the use of derivatives for hedging purposes, equity swaps were
held for investment purposes during 1999 and 1998. The notional amount of equity
swaps outstanding at December 31, 1999 and 1998 was $136 million and $138
million, respectively.

Foreign currency forwards, foreign currency swaps, stock futures and equity
swaps are reported at fair value. Resulting gains and losses on these contracts
are unrealized until expiration of the contract. There is no statement value
reported for interest rate swaps, bond futures and options to acquire interest
rate swaps prior to the settlement of the contract, at which time realized gains
and losses are deferred to IMR. Changes in the value of derivative instruments
are expected to offset gains and losses on the hedged investments. During 1999
and 1998, net realized and unrealized gains on investments were partially offset
by net realized losses of $55 million and $104 million, respectively, and net
unrealized gains (losses) of $17 million and $(58) million, respectively, on
derivative instruments. The effect of derivative instruments in 1997 was not
material to the Company's results of operations.

NOTE 3 -- RESERVES FOR POLICY BENEFITS

Life insurance reserves on substantially all policies issued since 1978 are
based on the Commissioner's Reserve Valuation Method with interest rates ranging
from 3 1/2% to 5 1/2%. Other life policy reserves are primarily based on the net
level premium method employing various mortality tables at interest rates
ranging from 2% to 4 1/2%.

Deferred annuity reserves on contracts issued since 1985 are valued primarily
using the Commissioner's Annuity Reserve Valuation Method with interest rates
ranging from 3 1/2% to 6 1/4%. Other deferred annuity reserves are based on
contract value. Immediate annuity reserves are based on present values of
expected benefit payments at interest rates ranging from 3 1/2% to 7 1/2%.

Active life reserves for disability income ("DI") policies issued since 1987 are
primarily based on the two-year preliminary term method using a 4% interest rate
and the 1985 Commissioner's Individual Disability Table A ("CIDA") for
morbidity. Active life reserves for prior DI policies are based on the net level
premium method, a 3% to 4% interest rate and the 1964 Commissioner's Disability
Table for morbidity. Disabled life reserves for DI policies are based on the
present values of expected benefit payments primarily using the 1985 CIDA
(modified for Company experience in the first four years of disability) with
interest rates ranging from 3% to 5 1/2%.

Use of these actuarial tables and methods involves estimation of future
mortality and morbidity. Actual future experience could differ from these
estimates.

NOTE 4 -- EMPLOYEE AND AGENT BENEFIT PLANS

The Company sponsors noncontributory defined benefit retirement plans for all
eligible employees and agents. The expense associated with these plans is
generally recorded by the Company in the period contributions are funded. As of
Notes to Consolidated Statutory Financial Statements
                                     B- 26
<PAGE>   50

January 1, 1999, the most recent actuarial valuation date available, the
qualified defined benefit plans were fully funded. The Company recorded a
liability of $109 million and $98 million for nonqualified defined benefit plans
at December 31, 1999 and 1998, respectively. In addition, the Company has a
contributory 401(k) plan for eligible employees and a noncontributory defined
contribution plan for all full-time agents. The Company's contributions are
expensed in the period contributions are made to the plans. The Company recorded
$31 million, $29 million and $27 million of total expense related to its defined
benefit and defined contribution plans for the years ended December 31, 1999,
1998 and 1997, respectively. The defined benefit and defined contribution plans'
assets of $2.2 billion and $1.9 billion at December 31, 1999 and 1998,
respectively, were primarily invested in the separate accounts of the Company.

In addition to pension and retirement benefits, the Company provides certain
health care and life insurance benefits ("postretirement benefits") for retired
employees. Substantially all employees may become eligible for these benefits if
they reach retirement age while working for the Company. Postretirement benefit
costs for the years ended December 31, 1999, 1998 and 1997 were a net expense
(benefit) of $5.0 million, $1.8 million and ($1.3) million, respectively.

<TABLE>
<CAPTION>
                            DECEMBER 31,         DECEMBER 31,
                                1999                 1998
                         ------------------   ------------------
<S>                      <C>                  <C>
Unfunded postretirement
  benefit obligation
  for retirees and
  other fully eligible
  employees (Accrued in
  statement of
  financial
  position)............  $40 million          $35 million
Estimated
  postretirement
  benefit obligation
  for active non-vested
  employees (Not
  accrued until
  employee vests)......  $68 million          $56 million
Discount rate..........  7%                   7%
Health care cost trend   10% to an ultimate   10% to an ultimate
  rate.................  5%, declining 1%     5%, declining 1%
                         for 5 years          for 5 years
</TABLE>

If the health care cost trend rate assumptions were increased by 1%, the accrued
postretirement benefit obligation as of December 31, 1999 and 1998 would have
been increased by $6 million and $5 million, respectively.

At December 31, 1999 and 1998, the recorded postretirement benefit obligation
was reduced by $28 million and $23 million, respectively, for health care
benefit plan assets. These assets were primarily invested in the separate
accounts of the Company.

NOTE 5 -- REINSURANCE

In the normal course of business, the Company seeks to limit its exposure to
loss on any single insured and to recover a portion of benefits paid by ceding
to reinsurers under excess coverage and coinsurance contracts. The Company
retains a maximum of $25 million of coverage per individual life and $35 million
maximum of coverage per joint life. The Company has an excess reinsurance
contract for disability income policies with retention limits varying based upon
coverage type.

The amounts shown in the accompanying consolidated financial statements are net
of reinsurance. Reserves for policy benefits at December 31, 1999 and 1998 were
reported net of ceded reserves of $584 million and $518 million, respectively.
The effect of reinsurance on premiums and benefits for the years ended December
31, 1999, 1998 and 1997 was as follows:

<TABLE>
<CAPTION>
                                1999     1998     1997
                               ------   ------   ------
                                    (IN MILLIONS)
<S>                            <C>      <C>      <C>
Direct premiums and
  deposits...................  $8,785   $8,426   $7,647
Premiums ceded...............    (441)    (405)    (353)
                               ------   ------   ------
Net premium and deposits.....  $8,344   $8,021   $7,294
                               ======   ======   ======
Benefits to policyowners and
  beneficiaries..............   9,205   $8,869   $8,057
Benefits ceded...............    (197)    (182)    (136)
                               ------   ------   ------
Net benefits to policyowners
  and beneficiaries..........  $9,008   $8,687   $7,921
                               ======   ======   ======
</TABLE>

In addition, the Company received $133 million, $121 million and $115 million
for the years ended December 31, 1999, 1998 and 1997, respectively, from
reinsurers representing allowances for reimbursement of commissions and other
expenses. These amounts are included in other income in the consolidated
statement of operations.

Reinsurance contracts do not relieve the Company from its obligations to
policyowners. Failure of reinsurers to honor their obligations could result in
losses to the Company; consequently, allowances are established for amounts
deemed uncollectible. The Company evaluates the financial condition

                            Notes to Consolidated Statutory Financial Statements
                                     B- 27
<PAGE>   51

of its reinsurers and monitors concentrations of credit risk arising from
similar geographic regions, activities or economic characteristics of the
reinsurers to minimize its exposure to significant losses from reinsurer
insolvencies.

NOTE 6 -- INCOME TAXES

Provisions for income taxes are based on current income tax payable without
recognition of deferred taxes. The Company files a consolidated life-nonlife
federal income tax return. Federal income tax returns for years through 1995 are
closed as to further assessment of tax. Adequate provision has been made in the
financial statements for any additional taxes, which may become due with respect
to the open years.

The Company's taxable income can vary significantly from gain from operations
before taxes due to differences between book and tax valuation of assets and
liabilities (e.g., investments and policy benefit reserves). The Company pays a
tax that is assessed only on the surplus of mutual life insurance companies
("equity tax"), and also, the Company must capitalize and amortize, as opposed
to immediately deducting, an amount deemed to represent the cost of acquiring
new business ("DAC tax").

The Company's effective tax rate on gains from operations before taxes for the
years ended December 31, 1999, 1998 and 1997 was 29%, 48%, and 56% respectively.
In 1999, the effective rate was less than the federal corporate rate of 35% due
primarily to differences between book and tax investment income. In 1998 and
1997, the effective rate was greater than 35% due primarily to the equity tax
and DAC tax.

NOTE 7 -- RELATED PARTY TRANSACTIONS

The Company acquired Frank Russell Company ("Frank Russell") effective January
1, 1999 for a purchase price of approximately $950 million. Frank Russell is a
leading investment management and consulting firm, providing investment advice,
analytical tools and investment vehicles to institutional and individual
investors in more than 30 countries. This investment is accounted for using the
equity method and is included in common stocks in the consolidated statement of
financial position. In 1999, the Company charged-off directly from surplus
approximately $842 million, representing the total goodwill associated with the
acquisition. The Company has received permission from the OCI for this
charge-off. The Company has unconditionally guaranteed certain debt obligations
of Frank Russell, including $350 million of senior notes and up to $150 million
of other credit facilities.

During 1999, the Company transferred appreciated equity investments to a
wholly-owned subsidiary as a capital contribution to the subsidiary. A realized
capital gain of $287 million was recorded on this transaction based on the fair
value of the assets upon transfer.

NOTE 8 -- CONTINGENCIES

The Company has guaranteed certain obligations of its other affiliates. These
guarantees totaled approximately $101 million at December 31, 1999 and are
generally supported by the underlying net asset values of the affiliates.

In addition, the Company routinely makes commitments to fund mortgage loans or
other investments in the normal course of business. These commitments aggregated
to $1.9 billion at December 31, 1999 and were extended at market interest rates
and terms.

The Company is engaged in various legal actions in the normal course of its
investment and insurance operations. In the opinion of management, any losses
resulting from such actions would not have a material effect on the Company's
financial position.

Notes to Consolidated Statutory Financial Statements
                                     B- 28
<PAGE>   52

[PRICEWATERHOUSECOOPERS LLP - LETTERHEAD]

R EPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Trustees and Policyowners of
The Northwestern Mutual Life Insurance Company

We have audited the accompanying consolidated statement of financial position of
The Northwestern Mutual Life Insurance Company and its subsidiary as of December
31, 1999 and 1998, and the related consolidated statements of operations, of
changes in surplus and of cash flows for each of the three years in the period
ended December 31, 1999. These consolidated financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards 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. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

As described in Note 1 to the financial statements, the Company prepared these
consolidated financial statements using accounting practices prescribed or
permitted by the Office of the Commissioner of Insurance of the State of
Wisconsin (statutory basis of accounting), which practices differ from
accounting principles generally accepted in the United States. Accordingly, the
consolidated financial statements are not intended to represent a presentation
in accordance with generally accepted accounting principles. The effects on the
consolidated financial statements of the variances between the statutory basis
of accounting and generally accepted accounting principles, although not
reasonably determinable, are presumed to be material.

In our opinion, the consolidated financial statements audited by us (1) do not
present fairly in conformity with generally accepted accounting principles, the
financial position of The Northwestern Mutual Life Insurance Company and its
subsidiary as of December 31, 1999 and 1998, or the results of their operations
or their cash flows for each of the three years in the period ended December 31,
1999 because of the effects of the variances between the statutory basis of
accounting and generally accepted accounting principles referred to in the
preceding paragraph and (2) do present fairly, in all material respects, the
financial position of The Northwestern Mutual Life Insurance Company and its
subsidiary as of December 31, 1999 and 1998 and the results of their operations
and their cash flows for each of the three years in the period ended December
31, 1999, on the basis of accounting described in Note 1.

/s/ PriceWaterhousecoopers LLP
January 24, 2000

Accountants' Report                  B- 29
<PAGE>   53

                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                   PAGE
                                                                                                   ----
<S>                                                                                                <C>
DISTRIBUTION OF THE CONTRACTS.......................................................................B-2

DETERMINATION OF ANNUITY PAYMENTS...................................................................B-2
      Amount of Annuity Payments....................................................................B-2
      Annuity Unit Value............................................................................B-2
      Illustrations of Variable Annuity Payments....................................................B-3

VALUATION OF ASSETS OF THE ACCOUNT..................................................................B-3

TRANSFERABILITY RESTRICTIONS........................................................................B-4

PERFORMANCE DATA....................................................................................B-4

EXPERTS.............................................................................................B-4

FINANCIAL STATEMENTS OF THE ACCOUNT.................................................................B-5
(for the two years ended December 31, 1999)

REPORT OF INDEPENDENT ACCOUNTANTS..................................................................B-17
(for the two years ended December 31, 1999)

FINANCIAL STATEMENTS OF NORTHWESTERN MUTUAL........................................................B-18
(for the three years ended December 31, 1999)

REPORT OF INDEPENDENT ACCOUNTANTS..................................................................B-29
(for the three years ended December 31, 1999)

</TABLE>

                                      B-30

<PAGE>   54


                                     PART C
                                OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

          (a)  Financial Statements
               The financial statements of NML Variable Annuity Account B and
               The Northwestern Mutual Life Insurance Company are included in
               the Statement of Additional Information.

               NML Variable Annuity Account B
               ------------------------------
               (for the two years ended December 31, 1999)
                Statement of Assets and Liabilities
                Statement of Operations
                Statement of Changes in Equity
                Notes to Financial Statements
                Report of Independent Accountants

               The Northwestern Mutual Life Insurance Company
               (for the three years ended December 31, 1999)
                Consolidated Statement of Financial Position
                Consolidated Statement of Operations
                Consolidated Statement of Changes in Surplus
                Consolidated Statement of Cash Flows
                Notes to Consolidated Statutory Financial Statements
                Report of Independent Accountants

          (b)  Exhibits

          Exhibit B(9)     Opinion and Consent of Robert J. Berdan, Esq.

          Exhibit B(10)    Consent of PricewaterhouseCoopers LLP

          The following exhibits were filed in electronic format with the
          initial Registration Statement on Form N-4 for NML Variable Annuity
          Account B, File No. 333-33232, CIK 0000072176, dated March 24, 2000,
          and are incorporated herein by reference:

          Exhibit B(3)     Form of Distribution Agreement between Northwestern
                           Mutual Investment Services, LLC and Robert W. Baird &
                           Co. Incorporated

          Exhibit B(4)(a)  Flexible  Payment  Variable  Annuity  Contract,
                           RR.V.B.MSNST.   (032000),   including Amendment to
                           Qualify as an Annuity for non-tax qualified business
                           (sex neutral)

          Exhibit B(4)(b)  Variable Annuity Contract Payment Rate Tables,
                           RR.V.A.B.MSNST. (032000), included in Exhibit B(4)(a)
                           above (sex distinct)

          Exhibit B(4)(c)  Enhanced Death Benefit, VA.EDB.(032000), included in
                           Exhibit B(4)(a) above

          Exhibit B(4)(d)  Waiver of Withdrawal Charge, VA.WWC.(032000),
                           included in Exhibit B(4)(a) above

          Exhibit B(5)     Application form, included in Exhibit B(4)(a) above


                                      C-1

<PAGE>   55


          The following exhibits were filed in electronic format with
          Post-Effective Amendment No. 57 on Form N-4 for NML Variable Annuity
          Account B, File No. 2-29240, CIK 0000072176, dated February 25, 1999,
          and are incorporated herein by reference:

          Exhibit B(8)(a)  Form of Participation  Agreement Among Russell
                           Insurance Funds, Russell Fund Distributors, Inc. and
                           The  Northwestern  Mutual Life  Insurance Company

          Exhibit B(8)(b)  Form of Administrative Service Fee Agreement between
                           The Northwestern Mutual Life Insurance Company and
                           Frank Russell Company

          The following exhibit was filed in electronic format with the
          Registration Statement on Form S-6 for Northwestern Mutual Variable
          Life Account, File No. 333-59103, CIK 0000742277, dated July 15, 1998,
          and is incorporated herein by reference.

          Exhibit A(6)(b)  Amended By-Laws of The Northwestern Mutual Life
                           Insurance Company dated January 28, 1998

          The following exhibits were filed in electronic format with the
          Registration Statement on Form N-4 for NML Variable Annuity Account A,
          File No. 333-22455, CIK 0000790162, dated February 27, 1997, and are
          incorporated herein by reference:

          Exhibit 99(b)    Resolution of the Board of Trustees of The
                           Northwestern Mutual Life Insurance Company creating
                           the Account and resolution of the Executive Committee
                           designating the formations of "NML Variable Annuity
                           Account A" and "NML Variable Annuity Account B"

          Exhibit A(3)(A)  Distribution Contract

          The following exhibit was filed in electronic format with
          Post-Effective Amendment No. 52 on Form N-4 for NML Variable Annuity
          Account B, File No. 2-29240, CIK 0000072176, dated November 13, 1995,
          and is incorporated herein by reference:

          EX-99.B1         Restated Articles of Incorporation of The
                           Northwestern Mutual Life Insurance Company

Item 25.  Directors and Officers of the Depositor

          The following lists include all of the Trustees, executive officers
and other officers of The Northwestern Mutual Life Insurance Company as of May
1, 2000 without regard to their activities relating to variable annuity
contracts or their authority to act or their status as "officers" as that term
is used for certain purposes of the federal securities laws and rules
thereunder.

TRUSTEES

Name                                  Business Address
----                                  ----------------

R. Quintus Anderson                   Aarque Capital Corporation
                                      20 West Fairmount Avenue
                                      P.O. Box 109
                                      Lakewood, NY 14750-0109


                                      C-2

<PAGE>   56




Edward E. Barr                        Sun Chemical Corporation
                                      222 Bridge Plaza South
                                      Fort Lee, NJ  07024

Gordon T. Beaham III                  Faultless Starch/Bon Ami Co.
                                      1025 West Eighth Street
                                      Kansas City, MO 64101

Robert C. Buchanan                    Fox Valley Corporation
                                      100 West Lawrence Street
                                      P.O. Box 727
                                      Appleton, WI  54911

George A. Dickerman                   Spalding Sports Worldwide
                                      425 Meadow Street
                                      P.O. Box 901
                                      Chicopee, MA  01021-0901

Pierre S. du Pont                     Richards, Layton and Finger
                                      P.O. Box 551
                                      1 Rodney Square
                                      Wilmington, DE 19899

James D. Ericson                      The Northwestern Mutual Life
                                      Insurance Company
                                      720 East Wisconsin Avenue
                                      Milwaukee, WI 53202

J. E. Gallegos                        Gallegos Law Firm
                                      460 St. Michaels Drive
                                      Building 300
                                      Santa Fe, NM 87505

Stephen N. Graff                      805 Lone Tree Road
                                      Elm Grove, WI 53122-2014

Patricia Albjerg Graham               Graduate School of Education
                                      Harvard University
                                      420 Gutman
                                      Cambridge, MA  02138

Stephen F. Keller                     101 South Las Palmas Avenue
                                      Los Angeles, CA 90004

Barbara A. King                       Landscape Structures, Inc.
                                      Route 3
                                      601 - 7th Street South
                                      Delano, MN 55328

J. Thomas Lewis                       228 St. Charles Avenue
                                      Suite 1024
                                      New Orleans, LA 70130



                                      C-3

<PAGE>   57


Daniel F. McKeithan, Jr.              Tamarack Petroleum Company, Inc.
                                      Suite 1920
                                      777 East Wisconsin Avenue
                                      Milwaukee, WI 53202

Guy A. Osborn                         Universal Foods Corp.
                                      433 East Michigan Street
                                      Milwaukee, WI 53202

Timothy D. Proctor                    Diageo plc
                                      8 Henrietta Place
                                      London W1M  9AG
                                      United Kingdom

H. Mason Sizemore, Jr.                The Seattle Times
                                      Fairview Avenue North and John Street
                                      P.O. Box 70
                                      Seattle, WA  98109

Harold B. Smith, Jr.                  Illinois Tool Works, Inc.
                                      3600 West Lake Avenue
                                      Glenview, IL 60625-5811

Sherwood H. Smith, Jr.                Carolina Power & Light Company
                                      411 Fayetteville Street Mall
                                      P.O. Box 1551
                                      Raleigh, NC  27602

Peter M. Sommerhauser                 Godfrey & Kahn, S.C.
                                      780 North Water Street
                                      Milwaukee, WI 53202-3590

John E. Steuri                        Advanced Thermal Technologies
                                      2102 Riverfront Drive, Suite 120
                                      Little Rock, AR  72202-1747

John J. Stollenwerk                   Allen-Edmonds Shoe Corporation
                                      201 East Seven Hills Road
                                      P.O. Box 998
                                      Port Washington, WI 53074-0998

Barry L. Williams                     Williams Pacific Ventures, Inc.
                                      100 First Street
                                      Suite 2350
                                      San Francisco, CA 94105

Kathryn D. Wriston                    c/o Shearman & Sterling
                                      599 Lexington Avenue
                                      Room 1126
                                      New York, NY 10022



                                       C-4

<PAGE>   58


Edward J. Zore                        The Northwestern Mutual Life
                                      Insurance Company
                                      720 East Wisconsin Avenue
                                      Milwaukee, WI 53202



EXECUTIVE OFFICERS

<TABLE>
<CAPTION>
     Name                                                 Title
     ----                                                 -----
<S>                                         <C>
Deborah A. Beck                             Executive Vice President
William H. Beckley                          Executive Vice President
Robert J. Berdan                            Vice President and General Counsel
John M. Bremer                              Senior Executive Vice President and Secretary
Peter W. Bruce                              Senior Executive Vice President
Steven T. Catlett                           Vice President
Mark G. Doll                                Senior Vice President
Thomas E. Dyer                              Vice President
James D. Ericson                            Chairman and Chief Executive Officer, Trustee
Christina H. Fiasca                         Vice President
Richard L. Hall                             Senior Vice President
William C. Koenig, FSA                      Senior Vice President and Chief Actuary
Gary E. Long                                Vice President and Controller
Susan A. Lueger                             Vice President
Meridee J. Maynard                          Vice President
Donald L. Mellish                           Senior Vice President
Bruce L. Miller                             Executive Vice President
Gregory C. Oberland                         Vice President
Barbara F. Piehler                          Vice President
James F. Reiskytl                           Vice President
Lora A. Rosenbaum                           Vice President
Mason G. Ross                               Senior Vice President
John E. Schlifske                           Senior Vice President
Leonard F. Stecklein                        Senior Vice President - Annuities & Accumulation Products
Frederic H. Sweet                           Senior Vice President
J. Edward Tippets                           Vice President
Martha M. Valerio                           Vice President
David B. Wescoe                             Vice President
W. Ward White                               Vice President
Walt J. Wojcik                              Senior Vice President
Edward J. Zore                              President and Trustee
</TABLE>


OTHER OFFICERS

<TABLE>
<CAPTION>
Name                                                                   Title
----                                                                   -----
<S>                                                  <C>
John M. Abbott                                       Director - Benefits Resources
Carl G. Amick                                        Director - Disability Products/Standards
Thomas R. Anderson                                   Director - Trust Services
Maria J. Avila                                       Associate Director - Investment Accounting
Michael J. Backus                                    Associate Director - Information Systems
John E. Bailey                                       Senior Actuary
Nicholas H. Bandow                                   Assistant Director - Information Systems
</TABLE>


                                      C-5

<PAGE>   59

<TABLE>
<S>                                                  <C>
Margaret A. Barkley                                  Director - Agency
Walter L. Barlow                                     Assistant Director - Education
Rebekah B. Barsch                                    Director NML Foundation
Sandra L. Barton                                     Assistant Director - Marketing Review
Bradford P. Bauer                                    Assistant Director - Advanced Marketing
Beth M. Berger                                       Assistant General Counsel & Assistant Secretary
Frederick W. Bessette                                Assistant General Counsel & Assistant Secretary
Carrie L. Bleck                                      Assistant Director - Controllers
D. Rodney Bluhm                                      Assistant General Counsel
Jessica J. Borgmann                                  Assistant Director - Agency
Willette Bowie                                       Employee Relations Director
Martin R. Braasch                                    Director - Disability Underwriting Standards
Patricia R. Braeger                                  Associate Director - Information Systems
James A. Brewer                                      Investment Research Officer
William J. Buholzer                                  Director - Employee Benefits
Michael S. Bula                                      Assistant General Counsel
Jerry C. Burg                                        Director - Field Benefits
Pency P. Byhardt                                     Assistant Director - New Business
Gregory B. Bynan                                     Director - Corporate Services
Kim M. Cafaro                                        Assistant Director - Annuity Marketing
John E. Cain                                         Assistant Director - Life Benefits
Gwen C. Canady                                       Assistant Director-Mutual Funds
Shanklin B. Cannon, M.D.                             Medical Director - Life Products/Research
Terese J. Capizzi                                    Director - Long Term Care
Kurt P. Carbon                                       Associate Director - Underwriting Standards
John P. Carrick                                      Assistant Director - Information Systems
Michael G. Carter                                    Director - Corporate Planning & Projects
William W. Carter                                    Associate Actuary
John E. Caspari                                      Assistant Director - Advertising & Corporate
                                                      Information
Walter J. Chossek                                    Associate Controller
Thomas R. Christenson                                Director - Employee Product Services
Eric P. Christophersen                               Director - Annuity Marketing
Alan E. Close                                        Associate Controller
Carolyn M. Colbert                                   Assistant Director - New Business
Margaret Winter Combe                                Director - Agency Development
Robyn S. Cornelius                                   Assistant Director - Field Financial Services
Virginia A. Corwin                                   Assistant Director - New Business
Barbara E. Courtney                                  Associate Director - Mutual Funds
Dennis J. Darland                                    Assistant Director - Disability Income
Thomas H. Davis                                      Associate Director - Information Systems
Nicholas De Fino                                     Assistant Director - Real Estate Investments
Carol A. Detlaf                                      Director - Annuity Administration
Colleen Devlin                                       Assistant Director - Communications
Glen W. DeZeeuw                                      Director - Agency Services
Jennifer L. Docea                                    Assistant Actuary
Lisa C. Dodd                                         Director - Policyowner Services
Richard P. Dodd                                      Assistant Director - Agency Development
Daniel C. Dougherty                                  Director - Personal Markets
Margaret T. Dougherty                                Associate Director - Information Systems
John R. Dowell                                       Director - Workforce Diversity
William O. Drehfal                                   Assistant Director - Media Services
Steven J. Dryer                                      Assistant Director - Annuity Marketing
</TABLE>


                                      C-6

<PAGE>   60


<TABLE>
<S>                                                  <C>
John E. Dunn                                         Assistant General Counsel & Assistant Secretary
Somayajulu Durvasula                                 Director - Field Financial Services
James R. Eben                                        Assistant General Counsel and Assistant
                                                       Secretary
Magda El Sayed                                       Assistant Director - Information Systems
Michael S. Ertz                                      Director - Agency
Thomas F. Fadden                                     Assistant Director - Information Systems
Zenia J. Fieldbinder                                 Assistant Director - Annuity Accumulation Products
Richard F. Fisher                                    Senior Actuary
Marcia L. Fitzgerald                                 Assistant Director - New Business
Dennis J. Fitzpatrick                                Director - Advanced Marketing
Jon T. Flaschner                                     Director - Agency
Kate M. Fleming                                      Assistant General Counsel and Assistant Secretary
Carol J. Flemma                                      Director - Long Term Care
Laurie Flessas                                       Assistant Director - Life Marketing
John E. Fobes II                                     Assistant Director - Agency Development
Donald Forecki                                       Investment Officer - Treasury Operations
Phillip B. Franczyk                                  Vice President - Agency
Stephen H. Frankel                                   Vice President - Actuarial
James Frasher                                        Assistant General Counsel and Assistant Secretary
Anne A. Frigo                                        Assistant Director - New Business
Richard R. Garthwait                                 Vice President - Field Financial Services
David L. Georgenson                                  Director - Agent Development
Timothy L. Gergens                                   Financial Officer - Underwriting Standards
Paulette A. Getschman                                Assistant Director - Policyowner Services
James W. Gillespie                                   Vice President - Information Systems
Walter M. Givler                                     Director - New Business
Edwin P. Glass, Jr.                                  Vice President - Trust Services
Robert P. Glazier                                    Products Officer - Actuarial
Robert K. Gleeson, M.D.                              Vice President - Medical Director
Mark J. Gmach                                        Director - Agency
Jason G. Goetze                                      Assistant Director - Long Term Care
William F. Grady                                     Director of Field Finances
John M. Grogan                                       Director - Disability Income
Thomas C. Guay                                       Director - Field Financial
Gerald A. Haas                                       Assistant Director - Information Systems
Patricia Ann Hagen                                   Associate Director - Information Systems
Ronald D. Hagen                                      Vice President - Long Term Care
Lori A. Hanes                                        Director - Human Resources
William M. Harris                                    Assistant Regional Director - South
Dennis R. Hart                                       Assistant Director - Agent Development
James C. Hartwig                                     Vice President - Advanced Marketing
Paul F. Heaton                                       Assistant General Counsel and Assistant Secretary
William L. Hegge                                     Associate Director of Telecommunications
Wayne F. Heidenreich                                 Medical Director
Susan J. Heinzelman                                  Assistant Actuary
Jacquelyn F. Heise                                   Associate Director - Information Systems
Robert L. Hellrood                                   Director - New Business
Herbert F. Hellwig                                   Assistant Director - Individual Annuity Marketing
Jane A. Herman                                       Director - Term Upgrade
Gary M. Hewitt                                       Vice President & Treasurer
John G. Hickmann                                     Assistant Director - Field Financial Services
Donna R. Higgins                                     Associate Director - Information Systems
</TABLE>


                                      C-7

<PAGE>   61

<TABLE>
<S>                                                  <C>
David L. Hilbert                                     Investment Officer
Karla D. Hill                                        Human Resource Officer
Susan G. Hill                                        Assistant Director - New Business
John D. Hillmer                                      Assistant Director - Information Systems
Hugh L. Hoffman                                      Assistant Director - Information Systems
Richard S. Hoffmann                                  Vice President - Audit
Terence J. Holahan                                   Assistant Director - Long Term Care
Bruce Holmes                                         Associate Actuary
Sharon A. Hyde                                       Assistant Director - Disability Income
Elizabeth S. Idleman                                 Assistant General Counsel and Assistant Secretary
Scott C. Iodice                                      Assistant Director - Agency Development
Joseph P. Jansky                                     Assistant Director - Corporate Planning & Development
Michael D. Jaquint                                   Assistant Actuary
Dolores A. Juergens                                  Associate Director - Agency Events
Mark A. Kaprelian                                    Assistant General Counsel and Assistant Secretary
Marilyn J. Katz                                      Assistant Director - Medical Consultants
John C. Kelly                                        Associate Controller
Kevin C. Kennedy                                     Assistant Director - Architecture
James B. Kern                                        Director - Disability Income
Donald C. Kiefer                                     Vice President - Actuarial
Jason T. Klawonn                                     Assistant Actuary
Allen B. Kluz                                        Director - Human Resources
Beatrice C. Kmiec                                    Assistant Director - New Business
James A. Koelbl                                      Assistant General Counsel and Assistant Secretary
John L. Kordsmeier                                   Director - Policyowner Services
Robert J. Kowalsky                                   Chief Architect - Information Systems
Carol L. Kracht                                      Assistant General Counsel & Assistant Secretary
Martha Krawczak                                      Life and Disability Products Officer - Policyowner
                                                       Services
Patricia A. Krueger                                  Assistant Director - Annuity Products
Jeffrey J. Krygiel                                   Associate Actuary
Todd L. Laszewski                                    Associate Actuary
Patrick J. Lavin                                     Assistant Director - New Business
James L. Lavold                                      Associate Director of Meetings - Agency
Donna L. Lemanczyk                                   Assistant Closing Director - Real Estate Investments
Elizabeth J. Lentini                                 Assistant General Counsel & Assistant Secretary
Sally Jo Lewis                                       Assistant General Counsel & Assistant Secretary
Mark P. Lichtenberger                                Associate Director - LINK Technical Planning
Paul E. Lima                                         Vice President-International Insurance Operations
Steven M. Lindstedt                                  Associate Director - Information Systems
Melissa C. Lloyd                                     Assistant Director - Advanced Marketing
James Lodermeier                                     Assistant Director - Tax Planning
Kurt W. Lofgren                                      Assistant General Counsel
George R. Loxton                                     Assistant General Counsel & Assistant Secretary
Mary M. Lucci                                        Director - Compliance & Best Practices
Christine M. Lucia                                   Human Resources Officer - Policyowner Services
Mark J. Lucius                                       Corporate Information Officer
Merrill C. Lundberg                                  Assistant General Counsel & Assistant Secretary
Jon K. Magalska                                      Associate Actuary
Jean M. Maier                                        Vice President - Policyowner Services
Joseph Maniscalco                                    Associate Director - Information Systems
Raymond J. Manista                                   Assistant General Counsel
</TABLE>


                                      C-8

<PAGE>   62

<TABLE>
<S>                                                  <C>
Steven C. Mannebach                                  Director of Field Development - Field Financial
                                                      Services
Jeffrey S. Marks                                     Director - Underwriting Standards
Steve Martinie                                       Assistant General Counsel & Assistant Secretary
Ted A. Matchulat                                     Actuarial Products Officer
Shawn P. Mauser                                      Assistant Director Personal Markets
Margaret McCabe                                      Director - Disability Income
Richard A. McComb                                    Director - Human Resources
William L. McCown                                    Vice President & Investment Counsel
Paul E. McElwee                                      Assistant General Counsel & Assistant Secretary
Allen J. McDonell                                    Assistant Director - Compliance
James L. McFarland                                   Assistant General Counsel & Assistant Secretary
Daniel E. McGinley                                   Director - Field Management Development
Mark J. McLennon                                     Assistant Director
Arthur J. Mees, Jr.                                  Assistant Actuary
Robert J. Meiers                                     Ad Valorem Tax Manager
Larry S. Meihsner                                    Assistant General Counsel & Assistant Secretary
Robert G. Meilander                                  Vice President - Actuarial
Richard E. Meyers                                    Assistant General Counsel
Patricia A. Michel                                   Assistant Director - Policyowner Services
Lynn A. Milewski                                     Assistant Director - Annuity Products
Jay W. Miller                                        Vice President & Tax Counsel
Sara K. Miller                                       Vice President - Life Marketing
Jill Mocarski                                        Associate Medical Director
Tom M. Mohr                                          Long Term Care Officer
Richard C. Moore                                     Associate Actuary
Scott J. Morris                                      Assistant General Counsel and Assistant Secretary
Sharon A. Morton                                     Investment Officer - Treasury & Investment Operations
Adrian J. Mullin                                     Assistant Director - Personal Markets
Timothy P. Murphy                                    Assistant Marketing Director - Disability Income
Randolph J. Musil                                    Assistant Director - Advanced Marketing
John E. Muth                                         Assistant Director - Advanced Marketing
David K. Nelson                                      Assistant General Counsel
Ronald C. Nelson                                     Director - Annuity Products
Timothy Nelson                                       Assistant Marketing Director - Compliance & Best
                                                      Practices
Leon W. Nesbitt                                      Vice President-Agency
Jeffrey J. Niehaus                                   Assistant Director - Annuity Products
Karen M. Niessing                                    Director - Policyowner Services
Daniel J. O'Meara                                    Director - Field Financial Services
Mary Joy O'Meara                                     Director - Field Financial Services
Mary S. Ogorchock                                    Assistant General Counsel and Assistant Secretary
Kathleen A. Oman                                     Director - Policyowner Services
Timothy A. Otto                                      Assistant General Counsel & Assistant Secretary
Thomas A. Pajewski                                   Investment Research Officer - Treasury & Investment
                                                      Operations
Arthur V. Panighetti                                 Director - Tax and Financial Planning
Christen L. Partleton                                Associate Director - Policyowner Services
Jeffrey L. Pawlowski                                 Assistant Director - Agency Development
David W. Perez                                       Assistant General Counsel
Judith L. Perkins                                    Assistant General Counsel & Assistant Secretary
Wilson D. Perry                                      Assistant General Counsel & Assistant Secretary
Peter T. Petersen                                    Assistant Director - Long Term Care
</TABLE>


                                      C-9

<PAGE>   63


<TABLE>
<S>                                                  <C>
Gary N. Peterson                                     Actuary
John C. Peterson                                     Director of Policyowner Services
Harvey W. Pogoriler                                  Assistant General Counsel & Assistant Secretary
Randolph R. Powell, M.D.                             Medical Director
Brian D. Powers                                      Director - Trust Services
Mark A. Prange                                       Associate Director - Information Systems
Brian R. Pray                                        Assistant Regional Director - New Business
Thomas O. Rabenn                                     Assistant General Counsel and Assistant Secretary
Steven M. Radke                                      Legislative Representative
David R. Remstad                                     Senior Actuary
David R. Retherford                                  Assistant Director - Disability Income
Stephen M. Rhode                                     Assistant Director - Annuity Products
Richard R. Richter                                   Vice President - Agency
Daniel A. Riedl                                      Assistant General Counsel
Marcia Rimai                                         Vice President - Litigation Counsel
Kathleen M. Rivera                                   Vice President - Insurance Counsel
Bethany M. Rodenhuis                                 Assistant General Counsel and Assistant Secretary
Faith B. Rodenkirk                                   Assistant Director - Group Marketing
James S. Rolfsmeyer                                  Assistant Director - Information Systems
Robert K. Roska                                      Associate Director - Information Systems
Sue M. Roska                                         Director - New Business
Harry L. Ruppenthal                                  Assistant Director of Policyowner Services
Stephen G. Ruys                                      Associate Director - Information Systems
Mary Ann Schachtner                                  Director - Field Training & Development
Linda Ann Schaefer                                   Associate Marketing Director - Policyowner Services
Timothy G. Schaefer                                  Assistant Director - Information Systems
Thomas F. Scheer                                     Assistant General Counsel & Assistant Secretary
Carlen A. Schenk                                     Associate Director - Compliance & Best Practices
Jane A. Schiltz                                      Vice President - Life Marketing
Kathleen H. Schluter                                 Assistant General Counsel & Assistant Secretary
Calvin R. Schmidt                                    Associate Director - Information Systems
Rodd Schneider                                       Assistant General Counsel and Assistant Secretary
Sarah R. Schneider                                   Assistant Director - Corporate Planning & Development
John O. Schnorr                                      Assistant Director - Compliance & Best Practices
Margaret R. Schoewe                                  Vice President - Information Systems
John F. Schroeder                                    Associate Director of Field Office Real Estate
Donna L. Schwartz                                    Assistant Director - New Business
Melva T. Seabron                                     Director - Corporate Services
Norman W. Seguin, II                                 Investment Officer - Ad Valorem Taxes
Catherine L. Shaw                                    Assistant General Counsel & Assistant Secretary
John E. Sheaffer, Jr.                                Assistant Director - Agency Development
Janet Z. Silverman                                   Director - New Business
Stephen M. Silverman                                 Assistant General Counsel
David W. Simbro                                      Managing Director - Life Marketing
Paul W. Skalecki                                     Associate Actuary
Cynthia S. Slavik                                    Assistant Director - Environmental Engineer
Mark W. Smith                                        Assistant General Counsel & Assistant Secretary
Warren L. Smith, Jr.                                 Investment Officer - Architecture
Steven W. Speer                                      Director - Annuity Products Marketing
Robert J. Spellman, M.D.                             Vice President & Chief Medical Director
Steve P. Sperka                                      Associate Actuary
Mark A. Stalsberg                                    Assistant Director - Field Financial Services
Barbara J. Stansberry                                Projects Director - New Business
</TABLE>


                                      C-10

<PAGE>   64

<TABLE>
<S>                                                  <C>
Bonnie L. Steindorf                                  Director of Department Operations - Agency
Steven H. Steidinger                                 Assistant Director - Life Marketing
Karen J. Stevens                                     Assistant General Counsel & Assistant Secretary
Steven J. Stribling                                  Senior Actuary
Stephen J. Strommen                                  Associate Actuary
Theodore H. Strupp                                   Associate Director - Communications
Daniel J. Suprenant                                  Director - Group Disability Marketing
Victoria A. Sweigart                                 Human Resources Officer
Rachel L. Taknint                                    Assistant General Counsel & Assistant Secretary
Thomas Talajkowski                                   Assistant Director - Tax and Financial Planning
Paul B. Tews                                         Director of Investment Planning - Treasury &
                                                       Investment Operations
Deanna L. Tillisch                                   Assistant Director - Media Relations
Susan M. Tompkins                                    Director - Field Training & Development
Thomas W. Towers                                     Director - Public Relations
Gloria E. Tracy                                      Assistant Director - Life Marketing
Linda K. Tredupp                                     Assistant Director - Information Systems
Chris G. Trost                                       Actuary
Mark J. Van Cleave                                   Assistant Director of Marketing Research - Corporate
                                                       Planning & Development
Michael T. Van Grinsven                              Assistant Director - Agency
Mary Beth Van Groll                                  Vice President - Information Systems
Gloria J. Venski                                     Associate Director - Disability Income
Janine L. Wagner                                     Assistant Director - Information Systems
Harlan M. Wahrman                                    Director - Corporate Planning & Development
Scott E. Wallace                                     Assistant Director - Policyowner Services
Hal W. Walter                                        Vice President - Agency
P. Andrew Ware                                       Vice President - Actuarial
Mary L. Wehrle-Schnell                               Associate Director - Information Systems
Daniel T. Weidner                                    Assistant Director - Information Systems
Joel S. Weiner                                       Assistant Medical Director
Ronald J. Weir                                       Associate Director - Information Systems
Kenneth R. Wentland                                  Assistant Director of Policyowner Services - East
Sandra D. Wesley                                     Associate Director of Special Projects -
                                                       Communications
Catherine A. Wilbert                                 Assistant General Counsel & Assistant Secretary
David L. Wild                                        Director - Corporate Services
Donald R. Wilkinson                                  Vice President - Agency
Becki L. Williams                                    Assistant Director - Life Marketing
Jeffrey B. Williams                                  Corporate Risk Manager
John K. Wilson                                       Director - Disability Income
Scott J. Witt                                        Assistant Actuary
Penelope A. Woodcock                                 Associate Director - Disability Income
Richard W. Woody                                     Assistant Director - Agency Development
Robert J. Wright                                     Industry Trends Officer
Stanford A. Wynn                                     Assistant Director - Advanced Marketing
Catherine M. Young                                   Assistant General Counsel & Assistant Secretary
Michael L. Youngman                                  Vice President - Legislative Representative
James A. Youngquist                                  Associate Actuary
Richard S. Zakrzewski                                Associate Research Officer - Information Systems
John Zao                                             Assistant Director - Information Systems
Diana M. Zawada                                      Associate Director - Controllers
Rick T. Zehner                                       Director - Corporate Planning & Development
</TABLE>


                                      C-11

<PAGE>   65


<TABLE>
<S>                                                  <C>
Patricia A. Zimmermann                               Investment Officer - Treasury & Investment Operations
Ray Zimmermann                                       Director - Field Financial Services
Philip R. Zwieg                                      Vice President of Technical Support - Information
                                                      Systems
Robert E. Zysk                                       Director - Tax and Financial Planning
</TABLE>

The business addresses for all of the executive officers and other officers is
720 East Wisconsin Avenue, Milwaukee, Wisconsin 53202.

Item 26.  Persons Controlled By or Under Common Control with the Depositor or
          Registrant

          The subsidiaries of The Northwestern Mutual Life Insurance Company
("Northwestern Mutual"), as of December 31, 1999 are set forth on pages C-13 and
C-14. In addition to the subsidiaries set forth on pages C-13 and C-14, the
following separate investment accounts (which include the Registrant) may be
deemed to be either controlled by, or under common control with, Northwestern
Mutual:

          1.   NML Variable Annuity Account A
          2.   NML Variable Annuity Account B
          3.   NML Variable Annuity Account C
          4.   Northwestern Mutual Variable Life Account

          Northwestern Mutual Series Fund, Inc. and Russell Insurance Funds (the
"Funds"), shown on page C-13 as subsidiaries of Northwestern Mutual, are
investment companies, registered under the Investment Company Act of 1940,
offering their shares to the separate accounts identified above; and the shares
of the Funds held in connection with certain of the accounts are voted by
Northwestern Mutual in accordance with voting instructions obtained from the
persons who own, or are receiving payments under, variable annuity contracts or
variable life insurance policies issued in connection with the accounts, or in
the same proportions as the shares which are so voted.


                                      C-12

<PAGE>   66

                    NORTHWESTERN MUTUAL CORPORATE STRUCTURE*
                            (AS OF DECEMBER 31, 1999)


THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
     General Account
     NML Variable Annuity Account A
     NML Variable Annuity Account B
     NML Variable Annuity Account C
     NML Group Annuity Separate Account
     NML Variable Life Account
     Eiger Corporation - 100%
     Frank Russell Company and its subsidiaries - 100%
     Bradford, Inc. - 100%
     NML/Tallahassee, Inc. - 100%
     Northwestern Investment Management Company - 100%
     Northwestern Mutual Las Vegas, Inc. - 100%
     Northwestern Long Term Care Insurance Company - 100%
     Northwestern International Holdings, Inc. - 100%
     Northwestern Foreign Holdings B.V. - 100%
     Saskatoon Centre, Limited - 100% (inactive)
     Northwestern Mutual Series Fund, Inc. (and its 11 portfolios) - 100%
     Russell Insurance Funds (and its 5 funds) - 70.8%
     Mason Street Funds, Inc. (and its 11 funds) - 77.03%
     MGIC Investment Corporation - 11%. MGIC holds 100% of the voting stock of
      the following:
      Mortgage Guaranty Reinsurance Corporation, MGIC, MGIC Reinsurance
      Corporation of Wisconsin, MGIC Mortgage Insurance Corporation, and various
      subsidiaries.
     Baird Financial Corporation - 80%. Baird Financial Corporation holds 80% of
      the voting stock of Robert W. Baird & Co., Incorporated and various
      subsidiaries.
     Northwestern Mutual Investment Services, LLC - 100%
     Northwestern Reinsurance Holdings N.V. - 100%
     Northwestern Financial Group LLC - 100% (inactive)
     NML - CBO, LLC - 49%

NML REAL ESTATE HOLDINGS, LLC - 100%
The Grand Avenue Corporation - 98.54%            Mitchell, Inc. - 100%
Marina Pacific, Ltd. - 100%                      Cass Corporation - 100%
Solar Resources, Inc. - 100%                     Burgundy, Inc. - 100%
Rocket Sports, Inc. - 100% (inactive)            Amber, Inc. - 100%
Summit Sports, Inc. - 100% (inactive)            Olive, Inc. - 100%
Greenway Sports, Inc. - 100% (inactive)          Bayridge, Inc. - 100%
RE Corporation - 100%                            Ryan, Inc. - 100%
INV Corp. - 100%                                 Pembrook, Inc. - 100%
Buffalo Promotions, Inc. - 100% (inactive)       PBClub, Inc. - 100%
NW Greenway #1 - 100% (inactive)                 Diversey, Inc. - 100%
NW Greenway #9 - 100% (inactive)                 Larkin, Inc. - 100% (inactive)
Logan, Inc. - 100%                               Russet, Inc. - 100% (inactive)

* Except for MGIC Investment Corporation and its subsidiaries, includes all NML
mutual funds and other corporations of which 50% or more voting power is
controlled by NML.



                                      C-13

<PAGE>   67


               NORTHWESTERN MUTUAL CORPORATE STRUCTURE, CONTINUED*
                            (AS OF DECEMBER 31, 1999)


NML SECURITIES HOLDINGS, LLC-100%

<TABLE>
<S>                                                                <C>
    NW Pipeline, Inc. - 100%                                       Kristina International Sales, Inc. - 100%
    Painted Rock Development Corporation - 100%                    NML/Mid Atlantic, Inc. - 100%
    NML Development Corporation - 100%                             KerryAnne International Sales, Inc. - 100%
    Stadium and Arena Management, Inc. - 100%                      Regina International Sales, Inc. - 100%
    Carlisle Ventures, Inc. - 100%
    Park Forest Northeast, Inc. - 100%
    Travers International Sales, Inc. - 100%
    Highbrook International Sales, Inc. - 100%
    Elderwood International Sales, Inc. - 100%
    Mallon International Sales, Inc. - 100%
    Higgins, Inc. - 100%
    Hobby, Inc. - 100%
    Baraboo, Inc. - 100%
    Elizabeth International Sales, Inc. - 100%
    Sean International Sales, Inc. - 100%
    Alexandra International Sales, Inc. - 100%
    Brian International Sales, Inc. - 100%
    Jack International Sales, Inc. - 100%
    Brendan International Sales, Inc. - 100%
    Justin International FSC, Inc. - 100%
    Mason & Marshall, Inc. - 100%
    North Van Buren, Inc. - 100%
    Northwestern Mutual Life
      International, Inc. - 100%
    White Oaks, Inc. - 100%
    Hazel, Inc. - 100%
    Maroon, Inc. - 100%
    Coral, Inc. - 100%
    Lydell, Inc. - 100%
    Klode, Inc. - 100%
    Chateau, Inc. - 100% (inactive)
    Lake Bluff, Inc. - 100% (inactive)
    Nicolet, Inc. - 100% (inactive)
    Tupelo, Inc. - 100% (inactive)
</TABLE>


* Except for MGIC Investment Corporation and its subsidiaries, includes all NML
mutual funds and other corporations of which 50% or more voting power is
controlled by NML.


                                      C-14


<PAGE>   68


Item 27.  Number of Contract Owners

          As of May 31, 2000, 245,832 variable annuity contracts issued in
connection with NML Variable Annuity Account B were outstanding. 199,659 such
contracts were issued as contracts for plans qualifying for special treatment
under various provisions of the Internal Revenue Code. 46,173 such contracts
were not so issued.

Item 28.  Indemnification

          That portion of the By-laws of Northwestern Mutual relating to
indemnification of Trustees and officers is set forth in full in Article VII of
the By-laws of Northwestern Mutual, amended by resolution and previously filed
as an exhibit to the Registration Statement.

Item 29.  Principal Underwriters

          (a) Northwestern Mutual Investment Services, LLC ("NMIS"), the
co-depositor of the Registrant, may be considered the principal underwriter
currently distributing securities of the Registrant. NMIS is also co-depositor,
and may be considered the principal underwriter, for Northwestern Mutual
Variable Life Account, a separate investment account of Northwestern Mutual
registered under the Investment Company Act of 1940 as a unit investment trust.
In addition NMIS is the investment adviser for Northwestern Mutual Series Fund,
Inc.

          (b) The directors and officers of NMIS are as follows:

<TABLE>
<CAPTION>
        Name                                         Position
        ----                                         --------
<S>                                     <C>
Ronald C. Alberts                       Vice President - Fixed Income Securities
Maria J. Avila                          Assistant Treasurer
Barbara Bay                             Assistant Director, Equity Compliance, NMIS
                                         Office of Supervisory Jurisdiction
Deborah A. Beck                         Director and Vice President, Variable Life
                                         Administration
William H. Beckley                      Executive Vice President, Sales
Peter W. Bruce                          Director
Thomas A. Carroll                       Vice President - Common Stocks
Walter J. Chossek                       Treasurer
Timothy S. Collins                      Vice President - Fixed Income Securities
Barbara E. Courtney                     Assistant Treasurer
Jefferson V. De Angelis                 Vice President - Fixed Income Securities
Mark G. Doll                            Executive Vice President, Investment Advisory
                                         Services
James R. Eben                           Assistant Secretary
Richard L. Hall                         Vice President, Variable Life Marketing
Lisa M. Heise                           Assistant Director, Equity Compliance, NMIS
                                         Office of Supervisory Jurisdiction
Laila V. Hick                           Assistant Director, Equity Compliance, NMIS
                                         Office of Supervisory Jurisdiction
Beatrice C. Kmiec                       Assistant Vice President, Variable Life
                                         Administration
Merrill C. Lundberg                     Secretary
Meridee J. Maynard                      President and CEO
Varun Mehta                             Vice President - Fixed Income Securities
Allan J. McDonell                       Vice President and Chief Compliance Officer
</TABLE>


                                      C-15

<PAGE>   69


<TABLE>
<S>                                     <C>
Ignatius L. Smetek                      Vice President - Common Stocks
Leonard F. Stecklein                    Vice President, Trust Services
Steven P. Swanson                       Vice President
Carla A. Thoke                          Director, Equity Compliance, NMIS Office of
                                         Supervisory Jurisdiction
J. Edward Tippetts                      Vice President, Sales Support
Julie Van Cleave                        Vice President - Common Stocks
Patricia L. Van Kampen                  Vice President - Common Stocks
William R. Walker                       Vice President
Edward J. Zore                          Director
Robert J. Ziegler                       Assistant Treasurer
</TABLE>

The address for each director and officer of NMIS is 720 East Wisconsin Avenue,
Milwaukee, Wisconsin 53202.

          (c) During 1999 life insurance agents of Northwestern Mutual who are
also registered representatives of NMIS received commissions, including general
agent overrides, in the aggregate amount of $21,569,657 for sales of variable
annuity contracts, and interests therein, issued in connection with the
Registrant. NMIS received compensation for its investment advisory services from
Northwestern Mutual Series Fund, Inc., the investment company in which assets of
the Registrant are invested.

Item 30.  Location of Accounts and Records

          All accounts, books or other documents required to be maintained in
connection with the Registrant's operations are maintained in the physical
possession of Northwestern Mutual at 720 East Wisconsin Avenue, Milwaukee,
Wisconsin 53202.

Item 31.  Management Services

          There are no contracts, other than those referred to in Part A or Part
B of this Registration Statement, under which management-related services are
provided to the Registrant and pursuant to which total payments of $5,000 or
more were made during any of the last three fiscal years.

Item 32.  Undertakings

          (a) The Registrant undertakes to file a post-effective amendment to
this Registration Statement as frequently as is necessary to ensure that the
audited financial statements in the Registration Statement are never more than
16 months old for so long as payments under the variable annuity contracts may
be accepted.

          (b) The Registrant undertakes to include either (1) as part of any
application to purchase a contract offered by the prospectus, a space that an
applicant can check to request a Statement of Additional Information, or (2) a
post card or similar written communication affixed to or included in the
prospectus that the applicant can remove to send for a Statement of Additional
Information.

          (c) The Registrant undertakes to deliver any Statement of Additional
Information and any financial statements required to be made available under
this Form promptly upon written or oral request.

          (d) Reference is made to the indemnification provisions disclosed in
response to Item 28. Insofar as indemnification for liabilities arising under
the Securities Act of 1933 may be permitted to directors, officers and
controlling persons of the Registrant pursuant to the foregoing provisions, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange


                                      C-16

<PAGE>   70


Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the registered
securities, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

          (e) The Northwestern Mutual Life Insurance Company hereby represents
that the fees and charges deducted under the contracts registered by this
registration statement, in the aggregate, are reasonable in relation to the
services rendered, the expenses expected to be incurred, and the risks assumed
by the insurance company.


                                      C-17

<PAGE>   71
                                   SIGNATURES

          As required by the Securities Act of 1933, and the Investment Company
Act of 1940, the Registrant, NML Variable Annuity Account B, has duly caused
this Amended Registration Statement to be signed on its behalf, in the City of
Milwaukee, and State of Wisconsin, on the 15th day of June, 2000.

                                             NML VARIABLE ANNUITY ACCOUNT B
                                             (Registrant)

                                             By  THE NORTHWESTERN MUTUAL LIFE
                                                 INSURANCE COMPANY
                                             (Depositor)

Attest: JOHN M. BREMER                       By: JAMES D. ERICSON
        -------------------------------          ---------------------------
        John M. Bremer                           James D. Ericson, Chairman
        Senior Executive Vice President          and Chief Executive Officer
        and Secretary
                                             By  NORTHWESTERN MUTUAL
                                                 INVESTMENT SERVICES, LLC
                                                 (Depositor)

Attest: MERRILL C. LUNDBERG                  By: MERIDEE J. MAYNARD
        -------------------------------          ---------------------------
        Merrill C. Lundberg, Secretary           Meridee J. Maynard,  President
                                                 and CEO

          As required by the Securities Act of 1933, this Amended Registration
Statement has been signed by the depositors on the 15th day of June, 2000.

                                             THE NORTHWESTERN MUTUAL LIFE
                                             INSURANCE COMPANY
                                             (Depositor)

Attest: JOHN M. BREMER                       By: JAMES D. ERICSON
        -------------------------------          ---------------------------
        John M. Bremer                           James D. Ericson, Chairman and
        Senior Executive Vice President          Chief Executive Officer
        and Secretary
                                             NORTHWESTERN MUTUAL INVESTMENT
                                             SERVICES, LLC
                                             (Depositor)

Attest: MERRILL C. LUNDBERG                  By:  MERIDEE J. MAYNARD
        -------------------------------          ---------------------------
        Merrill C. Lundberg, Secretary            Meridee J. Maynard,  President
                                                  and CEO

          As required by the Securities Act of 1933, this Amended Registration
Statement has been signed by the following persons in the capacities with the
depositor and on the dates indicated:

Signature                      Title
---------                      -----
                       Trustee, Chairman and
JAMES D. ERICSON       Principal Executive and         Dated June 15,
---------------------
James D. Ericson       Financial Officer               2000



EDWARD J. ZORE         Trustee and President
---------------------
Edward J. Zore



                                      C-18

<PAGE>   72


GARY E. LONG                        Vice President, Controller
-----------------------------       and Principal Accounting
Gary E. Long                        Officer


HAROLD B. SMITH*                    Trustee
-----------------------------
Harold B. Smith


J. THOMAS LEWIS*                    Trustee
-----------------------------
J. Thomas Lewis


PATRICIA ALBJERG GRAHAM*            Trustee
-----------------------------
Patricia Albjerg Graham


R. QUINTUS ANDERSON*                Trustee
-----------------------------
R. Quintus Anderson


STEPHEN F. KELLER*                  Trustee                         Dated
-----------------------------
Stephen F. Keller                                                June 15, 2000


PIERRE S. du PONT*                  Trustee
-----------------------------
Pierre S. du Pont


J. E. GALLEGOS*                     Trustee
-----------------------------
J. E. Gallegos


KATHRYN D. WRISTON*                 Trustee
-----------------------------
Kathryn D. Wriston


BARRY L. WILLIAMS*                  Trustee
-----------------------------
Barry L. Williams


GORDON T. BEAHAM III*               Trustee
-----------------------------
Gordon T. Beaham III


DANIEL F. McKEITHAN, JR.*           Trustee
-----------------------------
Daniel F. McKeithan, Jr.



                                      C-19


<PAGE>   73


EDWARD E. BARR*                     Trustee
-----------------------------
Edward E. Barr


ROBERT C. BUCHANAN*                 Trustee
-----------------------------
Robert C. Buchanan


SHERWOOD H. SMITH, JR.*             Trustee
-----------------------------
Sherwood H. Smith, Jr.


H. MASON SIZEMORE*                  Trustee                         Dated
-----------------------------
H. Mason Sizemore, Jr.                                           June 15, 2000


JOHN J. STOLLENWERK*                Trustee
-----------------------------
John J. Stollenwerk


GEORGE A. DICKERMAN*                Trustee
-----------------------------
George A. Dickerman


GUY A. OSBORN*                      Trustee
-----------------------------
Guy A. Osborn


JOHN E. STEURI*                     Trustee
-----------------------------
John E. Steuri


STEPHEN N. GRAFF*                   Trustee
-----------------------------
Stephen N. Graff


BARBARA A. KING*                    Trustee
-----------------------------
Barbara A. King


TIMOTHY D. PROCTOR*                 Trustee
-----------------------------
Timothy D. Proctor


PETER M. SOMMERHAUSER*              Trustee
-----------------------------
Peter M. Sommerhauser


*By:   JAMES D. ERICSON
       -------------------------------------------
       James D. Ericson, Attorney in Fact pursuant
       to the Power of Attorney previously filed on
       January 27, 2000


                                      C-20



<PAGE>   74

                                  EXHIBIT INDEX
                          EXHIBITS FILED WITH FORM N-4
                        PRE-EFFECTIVE AMENDMENT NO. 1 TO
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                       FOR
                          MASON STREET VARIABLE ANNUITY



Exhibit Number           Exhibit Name
--------------           ------------

Exhibit B(9)             Opinion and Consent of Robert J. Berdan, Esq.

Exhibit B(10)            Consent of PricewaterhouseCoopers LLP




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