PRINCIPAL MUTUAL LIFE INSURANCE COMPANY SEPARATE ACCOUNT C
10-K405, 2000-03-15
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                                 UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    Form 10-K

                  1. ANNUAL REPORT PURSUANT TO SECTION 15 (d)

                     OF THE SECURITIES EXCHANGE ACT OF 1934


For the fiscal year ended December 31, 1999   Commission File Number 2-39957 and
                          (current  number)   Commission File Number 33-58028

                        PRINCIPAL LIFE INSURANCE COMPANY
                   f/k/a PRINCIPAL MUTUAL LIFE INSURANCE COMPANY
                               SEPARATE ACCOUNT C
            (Exact Name of Registrant, as specified in its charter)



             Iowa                                           42-0127290
- -------------------------------               ----------------------------------
(State or other jurisdiction of                  IRS Employer Identification No.
incorporation or organization)                (Principal Life Insurance Company)

The Principal Financial Group
Des Moines, Iowa                                             50392-0200
- -------------------------------                ---------------------------------
         (Address)                                           (Zip Code)


Registrant's telephone number, including area code         (515) 248-3842


Securities registered pursuant to Section 12(g) of the Act:


         Variable Contracts - Participating with Pooled Separate Account
                         Variable Benefits - HR-10 Plans
         ---------------------------------------------------------------
                                (Title of Class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.

                             Yes  ___X___      No _______

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein,
and will not be contained,  to the best of registrant's knowledge, in definitive
proxy or information  statements  incorporated  by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. [X]

     The Registrant has no voting stock.


                                     PART I


Item 1. Business

        The  Registrant  is  a  separate  account  established  under  the  Iowa
        insurance  laws and  regulations  as Principal  Life  Insurance  Company
        Separate  Account C on April 12, 1971,  pursuant to a resolution  of the
        Executive  Committee  of  the  Board  of  Directors  of  Principal  Life
        Insurance  Company.  Principal Life Insurance  Company was  incorporated
        under Iowa law as a mutual life  insurance  company  named  Bankers Life
        Association.  It changed  its name to Bankers  Life  Company in 1911 and
        then to Principal Mutual Life Insurance Company in 1986. The name change
        to Principal LIfe  Insurance  Company and  reorganization  into a mutual
        holding company  structure took place in 1998. The account was formed to
        receive  payments  under  Principal  Life  Insurance  Company  Contracts
        designed  for use in  connection  with pension or profit  sharing  plans
        which qualify under the Self-Employed  Individuals Tax Retirement Act of
        1962, as amended  ("HR-10").  Principal  Life  Insurance  Company offers
        life, disability,  health and annuity contracts written on an individual
        and group basis.

        Pursuant to the Amendments enacted in 1970 to the Investment Company Act
        of 1940,  the Account is not an  investment  company for purposes of the
        Act.

        The objective of these  Contracts is to provide for the  accumulation of
        retirement  funds and to provide for  payments,  usually  commencing  at
        retirement,  which  tend to reflect  changes in the cost of living  both
        during the years prior to and the years  following the  commencement  of
        annuity payments.  With Bankers Flexible Annuity Contracts (Registration
        No. 2-39957),  Principal Life Insurance Company,  as a depositor for the
        Account,  seeks to accomplish  this  objective by investing the payments
        made under the Contracts in shares of Principal Variable Contracts Fund,
        Inc. - Capital Value Account (f/k/a Principal Capital Accumulation Fund,
        Inc.)  which  invests  principally  in common  stocks.  Similarly,  with
        Pension  Builder  Contracts  (Registration  No.  33-58028),  it seeks to
        accomplish this objective by investing  payments made under the Contract
        in three Divisions.  One is a "Common Stock Division" where payments are
        invested in shares of Principal  Variable Contracts Fund, Inc. - Capital
        Value Account.  Another is a "Money Market  Division" where payments are
        invested in  Principal  Variable  Contracts  Fund,  Inc., - Money Market
        Account  (f/k/a  Principal  Money Market Fund,  Inc.),  which invests in
        short-term money market instruments. The third Division is a "Government
        Securities  Division" where payments are invested in Principal  Variable
        Contracts Fund, Inc. - Government  Securities  Account (f/k/a  Principal
        Government  Securities Fund, Inc.),  which invests in obligations issued
        or guaranteed by the United States Government or its agencies. There may
        be a combination of investments in the three  Divisions,  as directed by
        Participants.

        Except for those Contracts described above with payments credited to the
        Registrant  (Principal Life Insurance  Company  Separate  Account C) and
        Variable  Annuity  Contracts and Variable Life Insurance  Contracts with
        payments credited to Principal Life Insurance Company Separate Account B
        and  Variable  Life   Separate   Account,   respectively,   the  Company
        distributes  its own products as permitted under the laws of the various
        jurisdictions in which the Company is authorized to do business,  namely
        the fifty states of the United  States,  the  District of Columbia,  the
        Commonwealth  of Puerto  Rico and the  Canadian  provinces  of  Alberta,
        British  Columbia,  Manitoba,  Ontario and Quebec.  Such distribution is
        through a field agency system of approximately 1,147 full-time agents, a
        group insurance sales  organization of approximately 262 individuals and
        through a large number of independent insurance brokers.

        The Contracts  described above with payments  credited to the Registrant
        and  other  Variable  Annuity  Contracts  and  Variable  Life  Insurance
        Contracts   are   distributed   through   Princor   Financial   Services
        Corporation,  an affiliated  broker-dealer  offering open-end management
        investment company shares, variable annuities,  variable life insurance,
        interests in limited  partnerships and general securities to the public.
        Such Contracts are sold primarily by registered  representatives  of the
        broker-dealer  who are also insurance agents of or brokers for Principal
        Life Insurance Company and authorized by applicable law to sell life and
        other forms of personal  insurance and who are  similarly  authorized to
        sell variable  annuities.  Such Contracts may also be sold through other
        selected broker-dealers.

        The  Registration  Statement  filed by the Registrant was made effective
        September  13,  1971,  and the first  sale of Bankers  Flexible  Annuity
        Contracts occurred on October 8, 1971.  Effective January 4, 1989, sales
        of Bankers Flexible Annuity Contracts were discontinued.

        In 1982  the  Registrant  filed a  Registration  Statement  in File  No.
        2-78747,  to  register  a  new  class  of  securities  (called  "Pension
        Builder")  for the same  HR-10  plan  market  utilizing  the  contingent
        deferred sales charge  concept.  The  registration  for Pension  Builder
        contracts first became effective on May 5, 1983 and the first sale under
        the Pension Builder Contract was made on September 19, 1983.

        In 1989 the Registrant  filed a new  Registration  Statement in File No.
        33-27256  for the  contracts  in view of the fact that  aggregate  sales
        under  the  prior  registration   statement  approached  the  amount  of
        contracts  registered  thereunder.  The  contracts  offered  by the  new
        registration  statement are identical to contracts previously registered
        under the 1933 Act in File No. 2-78747.

        In 1993 the Registrant  filed a new  Registration  Statement in File No.
        33-58028  for the  contracts  in view of the fact that  aggregate  sales
        under  the  prior  registration   statement  approached  the  amount  of
        contracts  registered  thereunder.  The  contracts  offered  by the  new
        registration  statement are identical to contracts previously registered
        under the 1933 Act in File No. 33-27256.  Effective  September 30, 1995,
        sales of Pension Builder Contracts were discontinued.

Item 2. Properties

        The Registrant owns no physical properties.  The principal properties of
        the Depositor,  Principal Life  Insurance  Company,  are its home office
        complex at The Principal Financial Group in Des Moines, Iowa.


Item 3. Legal Proceedings

        None.


Item 4. Submission of Matters to a Vote of Security Holders

        Inapplicable.


                                     PART II


Item 5. Market  for the  Registrant's  Common  Equity and  Related  Stockholder
        Matters

        a.    The  Registrant  does  not  issue  common  stock.   The  Contracts
              described in Item 1. are  distributed  through  Princor  Financial
              Services  Corporation,   an  affiliated   broker-dealer   offering
              open-end management investment company shares, variable annuities,
              variable life  insurance,  interests in limited  partnerships  and
              general  securities  to  the  public.   Such  Contracts  are  sold
              primarily by registered  representatives  of the broker-dealer who
              are  also  insurance  agents  of or  brokers  for  Principal  Life
              Insurance  Company and  authorized by applicable  law to sell life
              and  other  forms  of  personal  insurance  and who are  similarly
              authorized to sell variable annuities.  Such Contracts may also be
              sold through other selected broker-dealers.

              For Bankers Flexible Annuity Contracts  (Registration No. 2-39957)
              the high and low unit values for each quarterly period during 1998
              and 1999 are:

                             Lowest Unit Value                Highest Unit Value

First Quarter 1998              25.7039901                        29.7421641
Second  "     1998              28.9133343                        30.0327198
Third   "     1998              25.5325451                        30.3428328
Fourth  "     1998              25.8281110                        30.2336310
First   "     1999              29.0662723                        30.9482632
Second  "     1999              30.1740744                        33.1373049
Third   "     1999              27.9917253                        32.5341224
Fourth  "     1999              27.4644119                        30.3602459

              For Pension Builder  Contracts  (Registration  No. 33-58028) units
              were first valued at $1.00 on  September  19, 1983 for the Capital
              Value Division f/k/a Common Stock Division, September 22, 1983 for
              the Money Market  Division  and March 30, 1987 for the  Government
              Securities Division. Listed below are the low and high unit values
              for each quarterly period during 1998 and 1999.

                       Capital Value        Money Market    GovernmentSecurities
                          Division            Division            Division
                    ------------------- ------------------- -------------------
      Quarter         Lowest   Highest    Lowest    Highest   Lowest   Highest
      -------       --------- --------- --------- --------- --------- ---------

First Quarter  1998 5.0801506 5.8665362 1.8917032 1.9085747 2.0459757 2.0739041
Second   "     1998 5.6972242 5.9204981 1.9087654 1.9258325 2.0601982 2.1037409
Third    "     1998 5.0137197 5.9666438 1.9260245 1.9426780 2.1044991 2.1807744
Fourth   "     1998 5.0674580 5.9183008 1.9428674 1.9607951 2.1436487 2.1900032
First    "     1999 5.6831195 6.0565082 1.9609123 1.9751301 2.1436620 2.1837539
Second   "     1999 5.8911639 6.4621709 1.9760268 1.9897774 2.1102814 2.1819446
Third    "     1999 5.4368687 6.3339812 1.9899396 2.0059501 2.0846646 2.1531831
Fourth   "     1999 5.3320720 5.8890498 2.0066813 2.0252333 2.1230148 2.1664268

        b.    The approximate number of holders of record of each group contract
              and the  number of the  participants  therein as of  December  31,
              1999, are as follows:

                                        (1)                    (2)
                                  Number of Group           Number of
                                  Contract Holders         Participants
                                  ----------------         ------------
Bankers Flexible Annuity                 16                     16
Pension Builder                          32                     38

        c.    No dividends have been declared on units held by participants. Any
              changes  in net  investment  income,  net  realized  gains and net
              realized  appreciation  are included in the daily valuation of the
              units of the Registrant.

Item 6. Selected Financial Data

        The information  contained in the "Statements of Net Assets,  Statements
        of Operations and Statements of Changes in Net Assets for Principal Life
        Insurance  Company  Separate Account C", filed as Item 8. should be read
        in conjunction with this item.

Item 7. Management's Discussion and Analysis of Financial Condition and Results
        of Operation

        All payments made to the  Registrant on behalf of a Participant  under a
        contract (less any authorized deductions) are used to purchase shares of
        Principal Variable  Contracts Fund, Inc. - Capital Value Account,  Money
        Market Account,  Inc., or Government Securities Account, as appropriate,
        at net asset value. In addition, any distributions made by the Fund with
        respect to shares held by the  Registrant  are reinvested by the Fund at
        net asset  value.  Values  under the  contract  increase  or decrease to
        reflect the investment performance of the underlying investments.

        Principal  Variable  Contracts  Fund,  Inc. is an  open-end  diversified
        management  investment  company,  sponsored by Principal  Life Insurance
        Company.  The  principal  objective  of the  Capital  Value  Account  is
        long-term capital  appreciation and growth of future investment  income.
        It is intended  that the assets of the Fund will consist  primarily of a
        portfolio of common  stocks.  The value of the  investments  held by the
        Fund fluctuates  daily. It is subject to the risks of changing  economic
        conditions  as  well  as  the  risks  inherent  in  the  ability  of the
        management  of the  Account to  anticipate  changes in such  investments
        necessary to meet changes in economic conditions.

        The principal objective of the Money Market Account is to seek as high a
        level of income  available from  short-term  securities as is considered
        consistent  with  preservation of principal and maintenance of liquidity
        by  investing  all  of  its  assets  in  a  portfolio  of  money  market
        instruments.

        The principal objective of the Government  Securities Account is to seek
        a high  level of  current  income,  liquidity  and  safety of  principal
        through the purchase of  obligations  issued or guaranteed by the United
        States Government or its agencies,  with emphasis on Government National
        Mortgage Association Certificates ("GNMA Certificates").

Item 8. Financial Statements and Supplementary Data

                              Financial Statements

                        Principal Life Insurance Company
                               Separate Account C

                          Year ended December 31, 1999
                       with Report of Independent Auditors



                        Principal Life Insurance Company
                               Separate Account C

                              Financial Statements

                          Year ended December 31, 1999



                                    Contents

Report of Independent Auditors................................................1

Audited Financial Statements

Statements of Net Assets......................................................2
Statements of Operations......................................................3
Statements of Changes in Net Assets...........................................4
Notes to Financial Statements.................................................5


                         Report of Independent Auditors


Board of Directors and Participants
Principal Life Insurance Company


We have  audited the  accompanying  individual  and combined  statements  of net
assets of Principal Life Insurance  Company Separate Account C (comprised of the
Capital Value, Government Securities, and Money Market Divisions) as of December
31, 1999, and the related  statements of operations for the year then ended, and
changes in net assets for each of the two years in the period then ended.  These
financial  statements are the responsibility of the management of Principal Life
Insurance  Company.  Our  responsibility  is to  express  an  opinion  on  these
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.  Our
procedures included confirmation of securities owned as of December 31, 1999, by
correspondence  with the transfer  agent.  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.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the individual and combined  financial  position of the
respective  divisions of Principal Life Insurance  Company Separate Account C at
December 31, 1999, and the individual and combined  results of their  operations
for the year then ended, and the changes in their net assets for each of the two
years in the  period  then  ended,  in  conformity  with  accounting  principles
generally accepted in the United States.


                                                           /s/ Ernst & Young LLP


Des Moines, Iowa
January 31, 2000


                        Principal Life Insurance Company
                               Separate Account C

                            Statements of Net Assets

                                December 31, 1999



Assets
Investments:
   Capital Value Division:
     Capital Value Account - 46,485 shares at net asset value
       of $30.74 per share (cost - $1,234,452)                        $1,428,942
   Government Securities Division:
     Government Securities Account - 24,235 shares at net asset
       value of $10.26 per share (cost - $252,241)                       248,655
   Money Market Division:
     Money Market Account - 273,299 shares at net asset
       of $1.00 per share (cost - $273,299)                              273,299
                                                              ------------------
Net assets                                                            $1,950,896
                                                              ==================


                                                          Unit
                                              Units      Value
                                            --------------------

Net assets are represented by:
   Capital Value Division:
     Currently payable annuity contracts:
       Bankers Flexible Annuity               1,566      $28.61       $   44,803
       Pension Builder Plus                   3,027        5.54           16,770
     Contracts in accumulation period:
       Bankers Flexible Annuity              22,486       28.61          643,311
       Pension Builder Plus                 130,654        5.54          724,058
                                                              ------------------
                                                                       1,428,942
   Government Securities Division:
     Contracts in accumulation period -
       Pension Builder Plus                 116,410        2.14          248,655

   Money Market Division:
     Contracts in accumulation period -
       Pension Builder Plus                 135,182       2.02           273,299
                                                              ------------------
Net assets                                                            $1,950,896
                                                              ==================


See accompanying notes.


<TABLE>
<CAPTION>
                        Principal Life Insurance Company
                               Separate Account C

                            Statements of Operations

                          Year ended December 31, 1999


                                                                  Capital         Government        Money
                                                                   Value          Securities        Market
                                                  Combined        Division         Division        Division
                                                ---------------------------------------------------------------

Investment income
Income:
<S>                                                <C>            <C>              <C>             <C>
   Dividends                                       $  62,300      $  32,980        $16,511         $12,809
   Capital gains distributions                       179,883        179,883              -               -
                                                ---------------------------------------------------------------
                                                     242,183        212,863         16,511          12,809

Expenses:
   Mortality and expense risks                        26,992         18,323          4,611           4,058
   Administration charges                              2,538          1,430            365             743
                                                ---------------------------------------------------------------
                                                      29,530         19,753          4,976           4,801
                                                ---------------------------------------------------------------
Net investment income                                212,653        193,110         11,535           8,008

Realized and unrealized gains (losses) on
   investments
Net realized gains on investments                    544,408        533,424         10,984               -
Change in net unrealized appreciation or
   depreciation of investments                      (772,385)      (745,166)       (27,219)              -
                                                ---------------------------------------------------------------
Net increase (decrease) in net assets
   resulting from operations                       $ (15,324)     $ (18,632)       $(4,700)        $ 8,008
                                                ===============================================================
</TABLE>


See accompanying notes.


<TABLE>
<CAPTION>
                        Principal Life Insurance Company
                               Separate Account C

                       Statements of Changes in Net Assets

                     Years ended December 31, 1999 and 1998




                                                                  Capital         Government        Money
                                                                   Value          Securities        Market
                                                  Combined        Division         Division        Division
                                                ---------------------------------------------------------------

<S>                   <C>                         <C>            <C>               <C>              <C>
Net assets at January 1, 1998                     $3,416,522     $2,736,606        $401,865         $278,051

Increase (decrease) in net assets
Operations:
   Net investment income                             153,324        128,976          15,263            9,085
   Net realized gains on investments                  71,237         67,143           4,094                -
   Change in net unrealized appreciation or
     depreciation of investments                     149,708        142,101           7,607                -
                                                ---------------------------------------------------------------
Net increase in net assets resulting from            374,269        338,220          26,964            9,085
   operations
Changes from principal transactions:
   Purchase payments, less sales charges, per
     payment fees and applicable premium taxes        15,564        15,564                -                -
   Contract terminations                            (180,175)     (149,064)         (12,091)         (19,020)
   Annuity payments                                  (30,931)      (30,931)               -                -
                                                ---------------------------------------------------------------
Decrease in net assets from principal               (195,542)      (164,431)        (12,091)         (19,020)
   transactions
                                                ---------------------------------------------------------------
Total increase (decrease)                            178,727        173,789          14,873           (9,935)
                                                ---------------------------------------------------------------
Net assets at December 31, 1998                    3,595,249      2,910,395         416,738          268,116

Increase (decrease) in net assets
Operations:
   Net investment income                             212,653        193,110          11,535            8,008
   Net realized gains on investments                 544,408        533,424          10,984                -
   Change in net unrealized appreciation or
     depreciation of investments                    (772,385)      (745,166)        (27,219)               -
                                                ---------------------------------------------------------------
Net increase (decrease) in net assets                (15,324)       (18,632)         (4,700)           8,008
   resulting from operations
Changes from principal transactions:
   Contract terminations                          (1,611,286)    (1,445,078)       (163,383)          (2,825)
   Annuity payments                                  (17,743)       (17,743)              -                -
                                                ---------------------------------------------------------------
Decrease in net assets from principal             (1,629,029)    (1,462,821)       (163,383)          (2,825)
   transactions
                                                ---------------------------------------------------------------
Total increase (decrease)                         (1,644,353)    (1,481,453)       (168,083)           5,183
                                                ---------------------------------------------------------------
Net assets at December 31, 1999                   $1,950,896     $1,428,942        $248,655         $273,299
                                                ===============================================================
</TABLE>


See accompanying notes.


                        Principal Life Insurance Company
                               Separate Account C

                          Notes to Financial Statements

                                December 31, 1999



1. Investment and Accounting Policies

Principal Life Insurance  Company  Separate  Account C (Separate  Account C) was
organized by Principal Life  Insurance  Company  (Principal  Life) in accordance
with the  provisions  of the  Iowa  Insurance  Laws  and is a part of the  total
operations of Principal Life. The assets and  liabilities of Separate  Account C
are clearly  identified and distinguished  from the other assets and liabilities
of Principal Life, with the remaining  aggregate value of units  registered with
the Securities and Exchange Commission under the current registration  statement
(but not the authorized  number of units) limited to $10.6 million.  As directed
by  eligible  contractholders,  Separate  Account  C  invests  solely  in shares
representing interests in a corresponding  investment option. As of December 31,
1999, the  contractholder  investment  options  consisted of the accounts of the
following  diversified  open-end  management  investment  company,  organized by
Principal Life: Principal Variable Contracts Fund, Inc. - Capital Value Account,
Government Securities Account and Money Market Account.

Investments are stated at the closing net asset values per share on December 31,
1999. The average cost method is used to determine  realized gains and losses on
investments.  Dividends  are taken  into  income on an  accrual  basis as of the
ex-dividend date.

Separate  Account  C  supports  the  following  variable  annuity  contracts  of
Principal  Life:  Bankers  Flexible  Annuity  Contracts and Pension Builder Plus
Contracts. Contributions to Separate Account C are no longer accepted.

Use of Estimates in the Preparation of Financial Statements

The preparation of Separate  Account C's financial  statements and  accompanying
notes  requires  management to make  estimates and  assumptions  that affect the
amounts reported and disclosed.  These estimates and assumptions could change in
the future as more  information  becomes  known,  which could impact the amounts
reported and disclosed in the financial statements and accompanying notes.

2. Expenses

Principal Life is compensated for the following expenses:

   Bankers Flexible  Annuity  Contracts - Mortality and expense risks assumed by
   Principal Life are compensated  for by a charge  equivalent to an annual rate
   of 0.48% of the asset value of each contract. An annual administration charge
   of $7  for  each  participant's  account  is  deducted  as  compensation  for
   administrative   expenses.   The   mortality  and  expense  risk  and  annual
   administration charges amounted to $5,614 and $63,  respectively,  during the
   year 1999.


                        Principal Life Insurance Company
                               Separate Account C

                    Notes to Financial Statements (continued)

2. Expenses (continued)

   Pension  Builder  Plus  Contracts - Mortality  and expense  risks  assumed by
   Principal Life are compensated  for by a charge  equivalent to an annual rate
   of 1.4965% of the asset value of each contract.  A contingent sales charge of
   up to 7% may be deducted from withdrawals made during the first 10 years of a
   contract,  except for death or permanent disability. An annual administration
   charge  will be deducted  ranging  from a minimum of $25 to a maximum of $275
   depending upon a  participant's  investment  account values and the number of
   participants  under  the  retirement  plan and their  participant  investment
   account  value.  The charges for  mortality  and  expense  risks,  and annual
   administration amounted to $21,378 and $2,475, respectively,  during the year
   1999. There were no contingent sales charges during 1999.

3. Federal Income Taxes

Operations of Separate Account C are a part of the operations of Principal Life.
Under current practice,  no federal income taxes are allocated by Principal Life
to the operations of Separate Account C.


4. Purchases and Sales of Investment Securities

The aggregate units and cost of purchases and proceeds from sales of investments
were as follows:

<TABLE>
<CAPTION>
                                                          For the year ended December 31, 1999
                                            ------------------------------------------------------------------
                                                Units              Amount        Units              Amount
                                              Purchased          Purchased      Redeemed           Redeemed
                                            ------------------------------------------------------------------

<S>                                                <C>            <C>            <C>              <C>
   Capital Value Division:
     Bankers Flexible Annuity                      -              $108,922        39,587          $1,247,865
     Pension Builder Plus                          -               102,318        36,315             233,086
                                            ------------------------------------------------------------------
                                                   -               211,240        75,902           1,480,951

   Government Securities Division:
     Pension Builder Plus                          -                16,591        75,240             168,439

   Money Market Division:
     Pension Builder Plus                          -                12,808         1,787               7,625
                                            ------------------------------------------------------------------
                                                   -              $240,639       152,929          $1,657,015
                                            ==================================================================
</TABLE>

                        Principal Life Insurance Company
                               Separate Account C

                    Notes to Financial Statements (continued)

4. Purchases and Sales of Investment Securities (continued)

<TABLE>
<CAPTION>
                                                          For the year ended December 31, 1998
                                            ------------------------------------------------------------------
                                                Units              Amount        Units              Amount
                                              Purchased          Purchased      Redeemed           Redeemed
                                            ------------------------------------------------------------------
<S><C>                                            <C>             <C>             <C>             <C>
   Capital Value Division:
     Bankers Flexible Annuity                     583             $118,506         2,052          $  66,973
     Pension Builder Plus                           -               52,986        21,667            139,974
                                            ------------------------------------------------------------------
                                                  583              171,492        23,719            206,947

   Government Securities Division:
     Pension Builder Plus                           -               22,045         5,485             18,873

   Money Market Division:
     Pension Builder Plus                           -               14,110        10,246             24,045
                                            ------------------------------------------------------------------
                                                  583             $207,647        39,450           $249,865
                                            ==================================================================
</TABLE>

Purchases include reinvested dividends and capital gains.  Mortality adjustments
are included in purchases or redemptions, as applicable.

Money Market purchases include transactions where investment allocations are not
known at the time of the deposit.  Redemptions reflect subsequent allocations to
directed investment divisions.


5. Year 2000 Issues (Unaudited)

As of January 31, 2000, virtually all of the major technology systems, processes
and  infrastructure,  including  those which rely on third party vendors used by
Principal  Life and other service  providers of Separate  Account C appear to be
operating smoothly  following the rollover to the Year 2000.  Principal Life has
experienced  no  significant   interruptions  to  normal  business   operations,
including the processing of customer  account data and  transactions.  Principal
Life will continue its Year 2000 vigilance into early 2001.

Based on the performance of its major technology  systems to date, ongoing plans
to deal with external  relationships,  and  contingency  plans,  Principal  Life
believes that in the worst case scenario it will experience,  at most,  isolated
and  insignificant  disruptions  of business  processes as a result of Year 2000
issues.  Such disruptions are not expected to have a material effect on Separate
Account C's future results of operations, liquidity, or financial condition.Item

9. Changes in and  Disagreements  with  Accountants  on Accounting and Financial
   Disclosure

         Inapplicable.


                                    PART III


Item 10. Directors and Executive Officers of the Registrant

         Inapplicable,  the Registrant  does not have any directors or executive
         officers.


Item 11. Executive Compensation

         Inapplicable,  the Registrant  does not have any directors or executive
         officers.


Item 12. Security Ownership of Certain Beneficial Owners and Management

         No  person  owns  beneficially  or of  record  the  assets  held by the
         Depositor,  Principal Life Insurance Company,  in the Separate Account.
         As contractholders  of the variable  contracts each  contractholder has
         one vote in the election of the Board of  Directors at annual  meetings
         and upon other Principal Life Insurance Company matters,  if any, where
         a  policyholder's  vote is  taken.  The  contractholders  have the same
         voting  privilege  as do all  other  policyholders  of  Principal  Life
         Insurance Company. An individual participant  (certificateholder)  does
         not have a vote. There are no  policyholders  that are entitled to cast
         more than 5% of the votes to be cast.


Item 13. Certain Relationships and Related Transactions

         Inapplicable.

                                     PART IV


Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K

         (a) Documents filed as part of this report:

             1. The following financial statements are submitted herewith:

                Statements of Net Assets -- December 31, 1999

                Statements of Operations -- Year ended December 31, 1999

                Statements of Changes in Net Assets -- Years ended  December 31,
                1999 and 1998.

                Notes to Financial Statements -- December 31, 1999

             2. Schedules - All other  schedules for which  provision is made in
                the  applicable  accounting  regulation  of the  Securities  and
                Exchange   Commission   are  not  required   under  the  related
                instructions  or  are  inapplicable,  and  therefore  have  been
                omitted.

             3. Exhibits:

                (20) Subsidiaries of the Registrant


                         Subsidiaries of the Registrant

The Registrant is a separate account of Principal Life Insurance Company. It has
no  subsidiary.  Principal  Life  Insurance  Company,  as the  Depositor  of the
Account, owns or controls, as of December 31, 1999, subsidiaries as follows:

     I.   Principal Holding Company

          A.   Organized in Iowa.

          B.   Depositor owns 100% of outstanding stock.

          C.   Subsidiaries  of  Principal  Holding  Company as of December  31,
               1999, are as follows:

               1.   Patrician  Associates,   Inc. - a  real  estate  development
                    company.

                    a.   Organized in California.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               2.   Petula Associates, Ltd. - a real estate development company.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               3.   Principal  Development  Associates,   Inc. - a  real  estate
                    development company.

                    a.   Organized in California.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               4.   Principal   Spectrum   Associates,   Inc.  - a  real  estate
                    development company.

                    a.   Organized in California.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               5.   Principal   FC,   Ltd.  - a   limited   purpose   investment
                    corporation.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               6.   Equity  FC,  Ltd.  - a  general  business  corporation  that
                    engages  in  investment   transactions   including   limited
                    partnership and limited liability companies.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               7.   Invista Capital Management, LLC - an investment advisor.

                    a.   Organized in Delaware.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Subsidiary  of Invista  Capital  Management,  LLC is as
                         of December 31, 1999, is as follows:

                         (1)  Principal  Capital  -  Invista  Trust (a  business
                              trust and private investment company).

                              (a)  Organized in Delaware.

                              (b)  Invista Capital Management,  LLC owns 100% of
                                   outstanding shares.

               8.   HealthRisk   Resource  Group,   Inc. - a  general   business
                    corporation  engaged in providing managed care expertise and
                    administrative services to provider organizations.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               9.   Principal  Residential   Mortgage,   Inc. - a  full  service
                    mortgage banking company.


                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Susidiaries of Principal Residential Mortgage,  Inc. as
                         of December 31, 1999, are as follows:

                         (1)  Principal Wholesale  Mortgage,  Inc. - a brokerage
                              and servicer of residential mortgages.

                              (a)  Organized in Iowa.

                              (b)  Principal  Residential  Mortgage,  Inc.  owns
                                   100% of outstanding stock.

                         (2)  Principal    Reinsurance   Company  - a   mortgage
                              reinsurance company.

                              (a)  Organized in Vermont.

                              (b)  Principal  Residential  Mortgage,  Inc.  owns
                                   100% of outstanding stock.

               10.  Principal Asset Markets,  Inc. - a residential mortgage loan
                    broker - currently inactive.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               11.  Principal  Portfolio  Services,  Inc. - a corporation  which
                    provides mortgage diligence services.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               (12) The Admar  Group,  Inc. - a  national managed  care  service
                    organization that developes and manages  preferred  provider
                    organizations (PPO's).

                    a.   Organized in Florida.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Subsidiary  of The Admar  Group,  Inc. as of December
                         31, 1999, is as follows:

                         (1)  Admar   Corporation  - a  managed  care   services
                              organization.

                              (a)  Organized in California.

                              (b)  The   Admar   Group,   Inc.   owns   100%  of
                                   outstanding stock.

               13.  The  Principal   Financial  Group,  Inc. - general  business
                    corporation   established   in  connection   with  corporate
                    identity - currently inactive.

                    a.   Organized in Delaware.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               14.  Principal  Bank - a  federally   chartered  direct  delivery
                    savings bank.

                    a.   Federally organized.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               15.  Principal  Health Care, Inc. - a developer and administrator
                    of health maintenance organizations HMO's.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               16.  Dental-Net,   Inc.  - a   managed   dental   care   services
                    organization.

                    a.   Organizaed in Arizona.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Subsidiary of Dental-Net, Inc. as of December 31, 1999,
                         is as follows:

                         (1)  Employers  Dental  Services,  Inc.  -  an  prepaid
                              dental plan organization.

                              (a)  Orgnized in Arizona.

                              (b)  Dental-Net, Inc. owns 100% outstanding stock.

               17.  Principal Financial Advisors, Inc. - a registered investment
                    advisor.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               18.  Delaware  Charter Guarantee & Trust Company - a  corporation
                    that administers individual and group retirement plans.

                    a.   Organized in Delaware.

                    b.   Principal   Holding  Company  currently  owns  100%  of
                         outstanding stock.

               19.  Principal    Investors    Corporation  -  general   business
                    corporation - not currently active.

                    a.   Organized in New Jersey.

                    b.   Principal   Holding  Company  currently  owns  100%  of
                         outstanding stock.

               20.  Principal Product Networks, Inc. - an insurance broker which
                    markets select products.

                    a.   Organized in Delaware.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

               21.  Professional  Pensions,  Inc.  - a  corporation  engaged  in
                    sales, marketing and administration of group insurance plans
                    and third  party  administration  for  defined  contribution
                    plans.

                    a.   Organized in Conneticut.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Subsidiaries  of  Professional   Pensions,   Inc. as of
                         December 31, 1999, are as follows:

                         (1)  Benefit  Fiduciary  Corporation  -  a  corporation
                              which   services  as  a   corporate   trustee  for
                              retirement funds.

                              (a)  Organized in Rhode Island.

                              (b)  The Professional Pensions,  Inc. owns 100% of
                                   outstanding stock.

                         (2)  PPI Employee  Benefit  Corporation - a  registered
                              broker  dealer,  limited  to the sale of  open-end
                              mutual funds and variable insurance products.

                              (a)  Organized in Connecticut.

                              (b)  The Professional Pensions,  Inc. owns 100% of
                                   outstanding stock.

                         (3)  Boston Insurance Trust, Inc. - a corporation which
                              serves as trustee and  administrator  of insurance
                              trusts and arrangements.

                              (a)  Organized in Massacusetts.

                              (b)  The Professional Pensions,  Inc. owns 100% of
                                   outstanding stock.

               22.  Principal  International,  Inc. - a  corporation engaged in
                    international business development.

                    a.   Organized in Iowa.

                    b.   Principal  Holding  Company  owns  100% of  outstanding
                         stock.

                    c.   Subsidiaries  of  Principal  International,  Inc. as of
                         December 31, 1999, are as follows:

                         (1)  Principal International Espana, S.A. de Seguros de
                              Vida  -  a  life  insurance  company   (individual
                              group), annuities and pension.

                              (a)  Organized in Spain.

                              (b)  Principal  International,  Inc. owns  99%  of
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 1% of outstanding stock.

                              (c)  Subsidiary of Principal  Internationl Espana,
                                   S.A.  de Seguros de Vida as of  December  31,
                                   1999, are as follows:

                                   (1)  Princor  International  Espana  Sociedad
                                        Anonima  de Agencia de Seguros - a Spain
                                        corporation)   an  insurance   agency  -
                                        inactive.

                                        (a)  Organized in Spain.

                                        (b)  Principal   International   Espana,
                                             S.A.  de Seguros  de Vida  owns 99%
                                             of outstanding  stock and Principal
                                             International,  Inc.  owns  1%   of
                                             outstanding stock.

                                   (2)  Principal  Prevision,  EPSV - a  pension
                                        entity.

                                        (a)  Organized in Spain.

                                        (b)  Principal   International   Espana,
                                             S.A. de Seguros de Vida  controlled
                                             mutual entity, no shares issued.

                         (2)  Zao   Principal    International    -    inactive.

                              (a)  Organized in Russia.

                              (b)  Principal  International,  Inc.  owns  99% of
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 1% of outstanding stock.

                         (3)  Principal   International   Argentina,   S.A. - an
                              Argentina services corporation.

                              (a)  Organized in Argentina.

                              (b)  Principal International,  Inc. owns 97.03% of
                                   outstanding  stock and  Enrique S. Braun owns
                                   2.97% of outstanding stock

                              (c)  Subsidiaries of International Argentina, S.A.
                                   as of December 31, 1999, are as follows:

                                   (1)  Principal  Retiro Compania de Seguros de
                                        Retiro,      S.A.   -  an      Argentina
                                        annuity/employee     benefit    company.

                                        (a)  Organized in Argentina.

                                        (b)  Principal  Life Compania de Seguros
                                             S.A.  owns   approximately  99%  of
                                             outstanding   stock  and  Principal
                                             International  Argentina  S.A. owns
                                             approximately   1%  of  outstanding
                                             stock.

                                   (2)  Principal Life Compania de Seguros, S.A.
                                        - an Argentina life insurance company.

                                        (a)  Organized in Argentina.

                                        (b)  Principal International  Argentina,
                                             S.A. owns  99.9963% of  outstanding
                                             stock and Principal  International,
                                             Inc.  owns  .0037%  of  outstanding
                                             stock.

                         (4)  Principal  International Asia  Limited - operating
                              as a regional headquarters for Asia.

                              (a)  Organized in Hong Kong.

                              (b)  Principal  International,  Inc.  owns  50% of
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 50% of outstanding stock.

                              (c)  Subsidiary  of Principal  International  Asia
                                   Limited  as  of  December   31,  1999, is  as
                                   follows:

                                   (1)  BT  Funds   Management  (Asia)  Ltd.  a
                                        funds management company.

                                        (a)  Organized in Hong Kong.

                                        (b)  Principal    International   (Asia)
                                             Limited  owns  99%  of  outstanding
                                             stock    and    Principal     Asset
                                             Management  Company  (Asia) Limited
                                             owns     approximately     1%    of
                                             outstanding stock.

                         (5)  Principal  Asset  Management   Company (Asia) Ltd.
                              - an asset management company.

                              (a)  Organized in Hong Kong.

                              (b)  Principal  International,  Inc.  owns  99% of
                                   outstanding stock and Principal International
                                   (Asia)  Limited  owns   approximately  1%  of
                                   outstanding stock.

                         (6)  Principal  Insurance  Company  (Hong Kong) Limited
                              - for group life and group pension products.

                              (a)  Organized in Hong Kong.

                              (b)  Principal International, Inc. owns 87.169% of
                                   outstanding stock and Principal International
                                   (Asia)  Limited  owns  11.84% of  outstanding
                                   stock.

                         (7)  Principal  Trust Company (Asia) Limited - an  Asia
                              trust company.

                              (a)  Organized in Hong Kong.

                              (b)  Principal   Holding   Company   owns  20%  of
                                   outstanding  stock,   Principal   Residential
                                   Mortgage, Inc. owns 20% of outstanding stock,
                                   Principal  International  (Asia) Limited owns
                                   20% of outstanding stock, Principal Insurance
                                   Company   (Hong   Kong)   Limited   owns  20%
                                   outstanding      stock     and      Principal
                                   International, Inc. owns approximately 20% of
                                   outstanding stock.

                         (8)  Principal International de Chile, S.A. - a Chilean
                              holding company.

                              (a)  Organized in Chile.

                              (b)  Principal   International,   Inc.   owns  99%
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 1% of outstanding stock.

                              (c)  Subsidiaries  of Principal  International  de
                                   Chile,  S.A.  as of  December 31, 1999, is as
                                   follows:

                                   (1)  Principal  Compania  de Seguros de Vida,
                                        S.A. - a corporation  for group life and
                                        supplemental     health,      individual
                                        annuities.

                                        (a)  Organized in Chile.

                                        (b)  Principal  International  de Chile,
                                             S.A. owns 99% of outstanding  stock
                                             Antonia    Ortuzar    Vicuna   owns
                                             approximately   1%  of  outstanding
                                             stock.

                                        (c)  Subsidiary of Principal Compania de
                                             Seguros de Vida  Chile,  S.A. as of
                                             December 31, 1999, is as follows:

                                             (1)  Andueza &  Principal  Creditos
                                                  Hipotecarios    S.A.    -    a
                                                  residential           mortgage
                                                  operation.

                                                  (a)  Organized in Chile.

                                                  (b)  Principal   Compania   de
                                                       Seguros   de  Vida  Chile
                                                       S.A.    owns    60%    of
                                                       outstanding stock.

                         (9)  Principal Mexico Compania de Seguros, S.A. de C.V.
                              - a life  insurance  company  (individual  group),
                              personal accidents.

                              (a)  Organized in Mexico.

                              (b)  Principal  International,  Inc.  owns  99% of
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 1% of outstanding stock.

                         (10) Principal   Afore   S.A.  de  C.V.  -  a  pension
                              corporation.

                              (a)  Organized in Mexico.

                              (b)  Principal  International,  Inc.  owns  99% of
                                   outstanding   stock  and  Principal   Holding
                                   Company owns 1% of outstanding stock.

                              (c)  Subsidiary   of  Afore   S.A.de  C.V.  as  of
                                   December 31, 1999, is as follows:

                                   (1)  Siefore  Principal  S.A.  de  C.V.  -  a
                                        mutual fund (separate account) company.

                                        (a)  Organized in Mexico.

                                        (b)  Principal  Afore S.A. de C.V.  owns
                                             99%  of   outstanding   stock   and
                                             Principal International,  Inc. owns
                                             1% outstanding stock.

                         (11) Principal  Consulting  (India) Private Limited - a
                              consulting company - inactive.

                              (a)  Organized in India.

                              (b)  No shares issued.

                         (12) Principal Pensiones, S.A. de C.V. - single premium
                              annuity company.

                              (a)  Organized in Mexico.

                              (b)  Principal     International,     Inc.    owns
                                   approximatly  99% of  outstanding  stock  and
                                   Principal Holding Company owns  approximately
                                   1% of outstanding stock.

     II.  Principal  Development Investors, LLC - a  limited liability  company.

          A.   Organized in Delaware.

          B.   Depositor owns 100% of the outstanding stock.

     III. Principal Capital  Management,  LLC - a limited liability company that
          provides investment management services.

          A.   Organized in Delaware.

          B.   Depositor owns 100% of the outstanding stock.

          C.   Subsidiaries of Principal Capital Management,  LLC as of December
               31, 1999, are as follows:

               1.   Principal  Enterprise Capital,  LLC  - a  limited  liability
                    company.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

               2.   Principal Commercial Acceptance, LLC - a Delaware LLC.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

               3.   Principal   Real  Estate   Investors,  LLC  - a   regsitered
                    investment advisor.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

               4.   Principal Commercial Funding,  LLC - a correspondent  lender
                    and service provider for loans.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

               5.   Principal  Real Estate  Services,  LLC - a limited  liablity
                    company.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

               6.   Principal Structured Investments,  LLC - a limited liability
                    company that provides  product  development  administration,
                    marketing and asset management services.

                    (a)  Organized in Delaware.

                    (b)  Principal Capital Management, LLC owns 100% outstanding
                         stock.

     IV.  Principal Net Lease Investors, LLC - a limited liability company which
          operates as a buyer and seller of net leased investments.

          A.   Organized in Delaware.

          B.   Depositor owns 100% of the outstanding stock.

     V.   PT Asuransi Jiwa Principal  Indonesia - a life insurance company which
          offers group and individual products.

          (a)  Organized in Indonsesia.

          (b)  Principal  Life  Insurance  Company  owns  approximately  90%  of
               outstanding  stock  and  PT  megah  Cipta  Persada  Mandiri  owns
               approximately 10% of outstanding stock.

          (c)  Subsidiaries  of  PT  Asuransi  Jiwa  Principal  Indonesia  as of
               December 31, 1999, are as follows:

               (1)  PT Jasa  Principal  Indonesia  - a defined  benefit  pension
                    company.

                    (a)  Organized in Indonesia.

                    (b)  PT Asuransi Jiwa Principal Indonesia owns approximately
                         90% of  outstanding  stock and PT Megah  Cipta  Persada
                         Indonesia owns approximately 10% of outstanding stock.

               (2)  PT  Principal  Capital  Management   Indonesia  -  an  asset
                    management company.

                    (a)  Organized in Indonesia.

                    (b)  PT Asuransi Jiwa Principal Indonesia owns approximately
                         90% of  outstanding  stock and PT Megah  Cipta  Persada
                         Indonesia owns approximately 10% of outstanding stock.

               (3)  Dana  Pensiun  Lembaga  Keuangan  Principal  Indonesia  -  a
                    pension company.

                    (a)  Organized in Indonesia.

                    (b)  PT Asuransi Jiwa Principal Indonesia controlled entity,
                         no shares issued.

     VI.  PFG Do Brasil LTDA - a holding company (pension).

          (a)  Organized in Brazil.

          (b)  Principal  Financial  Services,  Inc.  owns  100% of  outstanding
               stock.

          (c)  Subsidiaries of PFG Do Brasil LTDA as of December 31, 1999, is as
               follows:

               (1)  BrasilPrev  Previdencia Privada S.A. - an individual pension
                    plan company.

                    (a)  Organized in Brazil.

                    (b)  PFG  Do   Brasil   LTDA  owns   approximately   42%  of
                         outstanding Stock.

The  Depositor's  investment  in its  subsidiaries,  which in turn  includes the
subsidiary's  investment  in its  subsidiaries,  is  included  in the  financial
statements of the Depositor.

                                   SIGNATURES


       Pursuant to the requirements of Section 15(d) of the Securities  Exchange
Act of 1934,  Principal Life Insurance Company has duly caused this report to be
signed on behalf of Principal Life Insurance  Company  Separate Account C by the
undersigned thereto duly authorized in the city of Des Moines and State of Iowa,
on the 15th day of March, 2000.

PRINCIPAL LIFE INSURANCE COMPANY SEPARATE ACCOUNT C

By   PRINCIPAL LIFE INSURANCE COMPANY

                   /s/ J. B. Griswell
By   ------------------------------------------------------
      J. B. Griswell, President and Chief Executive Officer


Attest:


/s/ Joyce N. Hoffman
- ---------------------------------------
Joyce N. Hoffman
Vice President and Corporate Secretary

       Pursuant to the requirements of the Securities Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
registrant in the capacities  with  Principal Life Insurance  Company and on the
dates indicated.


Signature                        Title                                 Date


 /s/ J. B. Griswell            President and                      March 15, 2000
- ---------------------          Chief Executive Officer
J. B. Griswell


/s/ D. C.  Cunningham          Vice President and                 March 15, 2000
- ----------------------         Controller (Principal
D. C. Cunningham               Accounting Officer)



/s/ M. H. Gersie               Executive Vice                     March 15, 2000
- ----------------------         President (Chief
M. H. Gersie                   Financial Officer)



  (B. J. Bernard)*             Director                           March 15, 2000
- ----------------------
B. J. Bernard



  (J. Carter-Miller)*          Director                           March 15, 2000
- ----------------------
J. Carter-Miller



  (D. J. Drury)*              Director                            March 15, 2000
- ----------------------
D. J. Drury



  (C. D. Gelatt)*              Director                           March 15, 2000
- ----------------------
C. D. Gelatt



  (G. D. Hurd)*                Director                           March 15, 2000
- ----------------------
G. D. Hurd



  (C. S. Johnson)*             Director                           March 15, 2000
- ----------------------
C. S. Johnson



  (W. T. Kerr)*                Director                           March 15, 2000
- ----------------------
W. T. Kerr



  (L. Liu)*                    Director                           March 15, 2000
- ----------------------
L. Liu



  (V. H. Loewenstein)*         Director                           March 15, 2000
- ----------------------
V. H. Loewenstein



  (R. D. Pearson)*             Director                           March 15, 2000
- ----------------------
R. D. Pearson



  (F. F. Pena)*              Director                             March 15, 2000
- ----------------------
F. F. Pena



  (J. R. Price, Jr.)*          Director                           March 15, 2000
- ----------------------
J. R. Price, Jr.



  (D. M. Stewart)*             Director                           March 15, 2000
- ----------------------
D. M. Stewart



  (E. E. Tallett)*             Director                           March 15, 2000
- ----------------------
E. E. Tallett



  (F. W. Weitz)*               Director                           March 15, 2000
- ----------------------
F. W. Weitz


                                                   /s/ J. B. Griswell
                                       *By -------------------------------------
                                           J. B. Griswell
                                           President and Chief Executive Officer


                                           Pursuant to Powers of Attorney
                                           Previously Filed or Included Herein


                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS,  that the undersigned director of Principal Life
Insurance Company,  an Iowa corporation (the "Company"),  hereby constitutes and
appoints D. J. Drury, J. B. Griswell,  G. R. Narber and J. N. Hoffman,  and each
of them (with full power to each of them to act alone),  the undersigned's  true
and lawful  attorney-in-fact and agent, with full power of substitution to each,
for and on behalf  and in the  name,  place  and  stead of the  undersigned,  to
execute and file any of the documents referred to below relating to registration
under the  Securities  Act of 1933 with respect to variable  annuity  contracts,
with premiums  received in connection  with such contracts held in the Principal
Life Insurance  Company  Separate Account C on Form N-4 or other forms under the
Securities  Act of  1933,  and  any  and  all  amendments  thereto  and  reports
thereunder  with all exhibits and all  instruments  necessary or  appropriate in
connection therewith, each of said attorneys-in-fact and agents and his or their
substitutes  being empowered to act with or without the others or other,  and to
have  full  power  and  authority  to do or  cause to be done in the name and on
behalf of the  undersigned  each and every act and thing requisite and necessary
or  appropriate  with  respect  thereto to be done in and about the  premises in
order to  effectuate  the same,  as fully to all  intents  and  purposes  as the
undersigned  might or could do in person;  hereby  ratifying and  confirming all
that said  attorneys-in-fact  and agents,  or any of them, may do or cause to be
done by virtue hereof.

IN WITNESS WHEREOF, the undersigned director has hereunto set his hand this 15th
day of March, 2000.


                                                 /s/ F. F. Pena
                                                 -------------------------------
                                                 F. F. Pena

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                        1,234,452
<INVESTMENTS-AT-VALUE>                       1,428,942
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               1,428,942
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                            0
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                             0
<SHARES-COMMON-STOCK>                          157,733
<SHARES-COMMON-PRIOR>                          233,635
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                 1,428,942
<DIVIDEND-INCOME>                              212,863
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (19,753)
<NET-INVESTMENT-INCOME>                        193,110
<REALIZED-GAINS-CURRENT>                       533,424
<APPREC-INCREASE-CURRENT>                    (745,166)
<NET-CHANGE-FROM-OPS>                         (18,632)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                     75,902
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       1,481,453
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 19,753
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                          252,241
<INVESTMENTS-AT-VALUE>                         248,655
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 248,655
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                            0
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                             0
<SHARES-COMMON-STOCK>                          116,410
<SHARES-COMMON-PRIOR>                          191,650
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   248,655
<DIVIDEND-INCOME>                               16,511
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 (4,976)
<NET-INVESTMENT-INCOME>                         11,535
<REALIZED-GAINS-CURRENT>                        10,984
<APPREC-INCREASE-CURRENT>                     (27,219)
<NET-CHANGE-FROM-OPS>                          (4,700)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                     75,240
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       (168,083)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  4,976
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<INVESTMENTS-AT-COST>                          273,299
<INVESTMENTS-AT-VALUE>                         273,299
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 273,299
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                            0
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                             0
<SHARES-COMMON-STOCK>                          135,182
<SHARES-COMMON-PRIOR>                          136,969
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   273,299
<DIVIDEND-INCOME>                               12,809
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 (4,801)
<NET-INVESTMENT-INCOME>                          8,008
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                            8,008
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                      1,787
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                           5,183
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  4,801
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>


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