PRINCIPAL SPECIAL MARKETS FUND INC
497, 1995-06-14
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                                            SUPPLEMENT, DATED JUNE 14, 1995
                                       TO THE PROSPECTUS DATED MARCH 1, 1995 OF
                                         PRINCIPAL SPECIAL MARKETS FUND, INC.



Effective June 14, 1995, the prospectus dated March 1, 1995 is amended by adding
the following as the last sentence to the paragraph under the caption Minimum 
Investment Requirement on page 15 of the prospectus :

The minimum initial purchase of the fund has been reduced to $1 million until
September 15, 1995. 

 

FV76S
    

   
                      PRINCIPAL SPECIAL MARKETS FUND, INC.
                       International Securities Portfolio
                      Mortgage-Backed Securities Portfolio




                        The Principal Financial Group(R)
                          Des Moines, Iowa 50392-0200
                                 1-800-521-1502



Principal  Special  Markets  Fund,  Inc.  (the  "Fund") is a  no-load,  open-end
management   investment   company,    currently   consisting   of   two   series
("Portfolios"), each of which is classified as a diversified investment company.
Each  Portfolio  is  designed  to meet the  investment  needs  of  institutions,
corporations and high net worth  individuals  desiring  professional  investment
management  for the type of  securities  in which each  Portfolio  invests.  The
investment objective of each Portfolio is as follows:

International  Securities  Portfolio:  Long-term growth of capital by investing
in a portfolio of securities of companies  domiciled in any of the nations of
the world.

Mortgage-Backed  Securities  Portfolio:  A total investment return consisting of
current income and capital  appreciation while maintaining  liquidity and safety
of principal.  The Portfolio seeks to achieve its objective through the purchase
of mortgage-backed  securities and other obligations issued or guaranteed by the
United States Government or its agencies or instrumentalities.  Portfolio shares
are not guaranteed by the United States Government.

This  Prospectus  concisely  states  information  that an investor ought to know
before  investing.  It  should  be  read  and  retained  for  future  reference.
Additional  information  about the Fund has been filed with the  Securities  and
Exchange  Commission,  including  a document  called a Statement  of  Additional
Information dated March 1, 1995 which is incorporated by reference  herein.  The
Statement of Additional Information can be obtained free of charge by writing or
telephoning Princor Financial Services Corporation,  P.O. Box 10423, Des Moines,
Iowa 50306-0423. Telephone 1-800-521-1502.


     THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED BY THE SECURITIES
AND  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
SECURITIES AND EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION  PASSED
UPON THE  ACCURACY OR ADEQUACY OF THIS  PROSPECTUS.  ANY  REPRESENTATION  TO THE
CONTRARY IS A CRIMINAL OFFENSE.

                 The date of this Prospectus is March 1, 1995.

<PAGE>

                               TABLE OF CONTENTS



                                                                      Page


Summary ..........................................................      3
Financial Highlights .............................................      5
Investment Objectives, Policies and Restrictions .................      6
Certain Investment Policies and Restrictions .....................      8
Risk Factors .....................................................      9
Manager and Investment Sub-Advisor ...............................      9
Duties Performed by the Manager and Sub-Advisor ..................     10
Managers' Comments ...............................................     10
Determination of Net Asset Value .................................     12
Performance Calculation ..........................................     12
Shareholder Rights ...............................................     12
Distribution of Income Dividends and Realized Capital Gains ......     13
Tax Treatment, Dividends and Distributions .......................     13
How to Invest ....................................................     14
Offering Price of Shares .........................................     15
Minimum Investment Requirement ...................................     15
Open Account System ..............................................     15
Redemption of Shares .............................................     16
Periodic Withdrawal Plan .........................................     17
Additional Information ...........................................     17




     This  Prospectus does not constitute an offer to sell, or a solicitation of
an offer to buy, the  securities of any Portfolio in any  jurisdiction  in which
such sale,  offer to sell, or solicitation  may not be lawfully made. No dealer,
salesperson,  or other person has been  authorized to give any information or to
make any  representations,  other than those  contained in this  Prospectus,  in
connection with the offer contained in this  Prospectus,  and, if given or made,
such other information or representations must not be relied upon as having been
authorized  by  Principal   Special   Markets  Fund,  Inc.  or  its  Manager  or
Sub-Advisor.

SUMMARY

     The following summarized information should be read in conjunction with the
detailed information appearing elsewhere in the Prospectus.

What benefits are offered investors?

     Professional Investment Management: Experienced securities analysts provide
each Portfolio with professional investment management.

     Diversification:  Each Portfolio will diversify by investing in securities
issued by a number of issuers. Diversification reduces investment risk.

     Economies of Scale: Pooling individual shareholder's  investments in either
of  the  Portfolios   creates   administrative   efficiencies   and  in  certain
circumstances  saves on  brokerage  commissions  through the  purchase of larger
blocks of securities.

     Liquidity: Upon request each Portfolio will redeem its shares and promptly
pay the investor the current net asset value next determined of the shares
redeemed. See "Redemption of Shares."

     Dividends:  Each Portfolio will normally  declare a dividend  payable from
investment income in accordance with its distribution policy. See "Distribution
of Income Dividends and Realized Capital Gains."

     Convenient Investment and Recordkeeping Services: Shareholders will receive
a statement of account each time there is activity in their account.

     No Sales Charge:  Each Portfolio offers its shares at net asset value,
without a sales charge.

What are the Portfolio investment objectives?

     The investment  objective of the International  Securities  Portfolio is to
seek  long-term  growth of capital by investing in a portfolio of  securities of
companies domiciled in any of the nations of the world.

     The investment objective of the Mortgage-Backed  Securities Portfolio is to
generate a total  investment  return  consisting  of current  income and capital
appreciation while maintaining liquidity and safety of principal.  The Portfolio
seeks  to  achieve  its  objective  through  the  purchase  of   mortgage-backed
securities  and other  obligations  issued or  guaranteed  by the United  States
Government  or its  agencies  or  instrumentalities.  Portfolio  shares  are not
guaranteed by the United States Government.

     There can be no assurance that the investment objectives will be realized.
See "Investment Objectives, Policies and Restrictions."

What are the risk factors?

     Because each Portfolio has a different investment objective, each Portfolio
is subject to different financial and market risks. Financial risk refers to the
earnings  stability  and overall  financial  soundness of an issuer of an equity
security and to the ability of an issuer of a debt  security to pay interest and
principal  when due.  Market  risk  refers to the degree to which the price of a
security  will react to  changes in  securities  markets  in general  and,  with
particular  reference  to debt  securities,  to changes in the overall  level of
interest rates.  See "Risk Factors",  and "Investment  Objectives,  Policies and
Restrictions."

What minimum amount may be invested?

     The  minimum  initial  purchase  in the Fund is $1.5  million.  The minimum
initial  purchase of $1.5  million may be  invested  over a three month  period.
Investments in both Portfolios by an investor,  investor's  spouse and dependent
children, or a trustee may be combined to meet this minimum. There is no minimum
for subsequent  investments.  Each Portfolio may involuntarily redeem all shares
in an account  which,  after a  redemption,  has a value of less than $5,000 and
mail the  proceeds  of such  redemption  to the  shareholder  at the  address of
record. See "Minimum Investment Requirement."

How may investments be withdrawn?

     Withdrawals, which are also known as redemptions, may be made by mail or by
telephone if telephone  transaction  services apply to the account.  Upon proper
authorization  certain  redemptions may be processed  through a selected dealer.
Redemptions may also be made through a Periodic Withdrawal Plan. Withdrawals are
made at net asset value without charge. See "Redemption of Shares."
Who manages each Portfolio?

     Princor  Management  Corporation,   a  corporation  organized  in  1969  by
Principal  Mutual  Life  Insurance  Company,  is the  Manager  for  each  of the
Portfolios.  It  is  also  the  dividend  disbursing  and  transfer  agent.  See
"Manager."   Invista  Capital   Management,   Inc.   ("Invista"),   an  indirect
wholly-owned  subsidiary  of  Principal  Mutual  Life  Insurance  Company and an
affiliate of the Manager,  has executed an agreement  with the Manager to assume
the obligations of the Manager to provide investment  advisory services for each
Portfolio.
<PAGE>

What fees and expenses apply to ownership of shares?

     The following  table  depicts fees and expenses  applicable to the purchase
and ownership of shares of each Portfolio.
<TABLE>
<CAPTION>

                                                       Shareholder Transaction Expenses
                                                           Maximum Sales Load Imposed
                                                                 on Purchases
          Portfolio                                   (as a percentage of offering price)                    Redemption Fee
<S>                                                                <C>                                            <C>
   International Securities Portfolio                              None                                           None*
   Mortgage-Backed Securities Portfolio                            None                                           None*
</TABLE>
<TABLE>
<CAPTION>

                                                      Annual Portfolio Operating Expenses
                                                    (as a percentage of average net assets)
                                                Management          12b-1            Other      Total Operating
               Portfolio                           Fee               Fee          Expenses**        Expenses
<S>                                             <C>                  <C>             <C>              <C>
   International Securities Portfolio           .90%                 None            None             .90%
   Mortgage-Backed Securities Portfolio         .45%                 None            None             .45%
<FN>  

   * A wire charge of up to $15.00 will be deducted for all wire transfers.
   **In addition to brokerage and extraordinary  expenses,  a Portfolio will pay
   only taxes and interest expenses,  which it is anticipated will be minimal or
   nonexistent under normal circumstances.
</FN>
</TABLE>

     The purpose of the above table is to assist the  investor in  understanding
the various  expenses that an investor in each  Portfolio  will bear directly or
indirectly.  The fee payable by the International Securities Portfolio is higher
than that paid by most funds to their  advisors,  but it is not higher  than the
fees paid by many funds with similar investment objectives and policies and does
cover substantially all expenses of the Portfolio,  unlike many other funds. See
"How to Invest" and "Duties Performed by the Manager and Sub-Advisor."

   Examples

       You would pay the following expenses on a $1,000 investment, assuming 
(1) 5% annual return and (2) redemption at the end of each time period:

                                                   Period (in years)
                   Fund                  1         3          5           10
                   ----                  -         -          -           --

 International Securities Portfolio      $9       $29        $50        $111
 Mortgage-Backed Securities Portfolio    $5       $14        $25         $57

       The  Examples are based on each  Portfolio's  Annual  Operating  Expenses
   described above.  The Examples should not be considered a  representation  of
   past or future  expenses;  actual  expenses may be greater or less than those
   shown.
<PAGE>
FINANCIAL HIGHLIGHTS

     The  following  financial  highlights  have  been  derived  from  financial
statements  which have been audited by Ernst & Young LLP,  independent  auditors
whose report thereon has been  incorporated by reference  herein.  The financial
highlights should be read in conjunction with the financial statements,  related
notes  and  other  financial  information  for each  portfolio  incorporated  by
reference  herein.  The financial  statements  may be obtained by  shareholders,
without charge, by telephoning 1-800-451-5447.
<TABLE>
<CAPTION>

                                                                                  Principal Special Markets Fund

                                                                      International Securities          Mortgage-Backed Securities
                                                                              Portfolio                          Portfolio

                                                                       Year           Period             Year           Period
                                                                       Ended           Ended             Ended           Ended
                                                                   Dec. 31, 1994  Dec. 31, 1993(a)   Dec. 31, 1994  Dec. 31, 1993(a)
<S>                                                                  <C>             <C>               <C>             <C>   
Net Asset Value at Beginning of Period..........................     $12.87          $10.01            $10.10          $10.01

Income from Investment Operations:
     Net Investment Income......................................        .13             .07               .63             .34
     Net Realized and Unrealized Gains (Losses) on
       Investments and Foreign Currency.........................       (.95)           2.91              (.99)            .09
                               Total from Investment Operations        (.82)           2.98              (.36)            .43

Less Distributions:
     Dividends (from net investment income).....................       (.25)           (.10)             (.63)           (.34)
     Distributions (from capital gains).........................       (.51)           (.02)                --              --
                                            Total Distributions        (.76)           (.12)             (.63)           (.34)

Net Asset Value at End of Period................................     $11.29          $12.87           $  9.11          $10.10

Total Return....................................................      (6.45)%         29.95%(c)         (3.60)%          4.47%(c)

Ratios/Supplemental Data:
     Net Assets, End of Period (in thousands)...................     $15,542         $16,838           $14,714        $24,309
     Ratio of Expenses to Average Net Assets....................        .90%            .90%(b)           .45%            .45%(b)
     Ratio of Net Investment Income to Average Net Assets.......        .94%           1.21%(b)          6.56%           5.23%(b)
     Portfolio Turnover Rate....................................       37.0%           6.9%(b)          41.8%            9.6%(b)
<FN>

(a)  Period from May 7, 1993,  date shares first offered to the public,  through
     December 31, 1993. Net investment  income,  aggregating  $.01 per share for
     the  International   Securities  Portfolio  and  $.01  per  share  for  the
     Mortgage-Backed  Securities  Portfolio  for the  period  from  the  initial
     purchase of shares on April 26, 1993 through May 6, 1993,  was  recognized,
     none of which was distributed from the International  Securities  Portfolio
     and all of  which  was  distributed  from  the  Mortgage-Backed  Securities
     Portfolio to the sole shareholder, Principal Mutual Life Insurance Company,
     during the period.  Additionally,  the Mortgage-Backed Securities Portfolio
     incurred  unrealized  gains on  investments  of $.01 per share  during  the
     initial interim period. This represented activities of each portfolio prior
     to the initial offering.

(b)  Computed on an annualized basis.

(c)  Total return amounts have not been annualized.
</FN>
</TABLE>

<PAGE>

INVESTMENT OBJECTIVES, POLICIES AND RESTRICTIONS

     The  investment  objectives  and policies of the  Portfolios  are described
below. There can be no assurance that the objectives will be realized.

International Securities Portfolio

     The  investment  objective is to seek long-term  growth of capital  through
investment  in a portfolio of  securities  of companies  domiciled in any of the
nations of the world. In choosing  investments,  which will consist primarily of
equity  securities of foreign  corporations,  Invista  intends to pay particular
attention to long-term  earnings  prospects and the relationship of then-current
prices to such  prospects.  Short-term  trading is not generally  intended,  but
occasional  investments  may be made for the  purpose of seeking  short-term  or
medium-term gain. The Portfolio expects its investment  objective to be met over
long periods which may include  several  market  cycles.  For a  description  of
certain   investment  risks  and  tax   implications   associated  with  foreign
securities,   see   "Risk   Factors,"   and  "Tax   Treatment,   Dividends   and
Distributions."

     The Portfolio will seek to be fully invested under normal conditions in the
following equity securities: common stocks; preferred stocks and debt securities
that are  convertible  into  common  stock,  that carry  rights or  warrants  to
purchase common stock or that carry rights to participate in earnings; rights or
warrants  to  subscribe  to or purchase  any of the  foregoing  securities;  and
sponsored and unsponsored  American  Depository  Receipts (ADRs) based on any of
the foregoing securities.  Unsponsored ADRs are not created by the issuer of the
underlying security, may be subject to fees imposed by the issuing bank that, in
the case of sponsored  ADRs,  would be paid by the issuer of a sponsored ADR and
may involve  additional risks such as reduced  availability of information about
the issuer of the underlying security.

     The Portfolio intends that its investments normally will be allocated among
various  countries.  Although there is no limitation on the percentage of assets
that may be invested in any one country or denominated in any one currency,  the
Portfolio  intends  under normal  market  conditions to have at least 65% of its
assets invested in securities issued by corporations of at least three countries
other than the United States. Investments may be made anywhere in the world, but
it is expected  that  primary  consideration  will be given to  investing in the
securities  issued  by  corporations  of  Western  Europe,   North  America  and
Australasia  (Australia,  Japan  and Far  East  Asia)  that  have  developed  or
developing economies. Changes in investments may be made as prospects change for
particular countries, industries or companies.

     The Fund may invest in the securities of other investment companies but may
not  invest  more  than 10% of its  assets  in  securities  of other  investment
companies,  invest more than 5% of its total assets in the securities of any one
investment company, or acquire more than 3% of the outstanding voting securities
of any one investment company except in connection with a merger,  consolidation
or plan of  reorganization.  The Fund's Manager will waive its management fee on
the Fund's assets invested in securities of other open-end investment companies.
The Fund will  generally  invest only in those  investment  companies  that have
investment policies requiring investment in securities  comparable in quality to
those in which the Fund invests.

     When in the  opinion  of  Invista  current  market or  economic  conditions
warrant,  the  Portfolio  may for temporary  defensive  purposes  place all or a
portion of its assets in cash, on which the Portfolio would earn no income, cash
equivalents,  bank  certificates  of deposit,  bankers  acceptances,  repurchase
agreements,  commercial paper,  commercial paper master notes which are floating
rate debt  instruments  without a fixed  maturity,  government  securities,  and
preferred stock and investment grade debt securities, whether or not convertible
into or carrying  rights for common  stock.  These  securities  may be issued by
domestic  or  foreign  corporations,   governments  or  governmental   agencies,
instrumentalities  or political  subdivisions  and may be  denominated in United
States dollars or some other  currency.  When investing for temporary  defensive
purposes,  the  Portfolio  is not  investing  so as to  achieve  its  investment
objective.  The  Portfolio  may  also  maintain  reasonable  amounts  in cash or
short-term debt securities (rated by a nationally recognized  statistical rating
organization  in one of the two highest rating  categories  for short-term  debt
obligations)  for  daily  cash  management  purposes  or  pending  selection  of
particular long-term investments.

Mortgage-Backed Securities Portfolio

     The  investment   objective  is  to  generate  a  total  investment  return
consisting  of  current  income  and  capital   appreciation  while  maintaining
liquidity and safety of principal.

     The  Portfolio  will  invest  in   mortgage-backed   securities  and  other
obligations  issued or  guaranteed  by the United  States  Government  or by its
agencies or instrumentalities  ("U.S.  Government Securities") and in repurchase
agreements  collateralized by such obligations.  Under normal market conditions,
the  Portfolio  intends to invest at least 65% of its assets in  mortgage-backed
securities.  The U.S.  Government  Securities in which the Portfolio  intends to
invest include Government National Mortgage Association ("GNMA") Certificates of
the modified  pass-through type, Federal National Mortgage  Association ("FNMA")
Obligations,  Federal Home Loan Mortgage Corporation ("FHLMC")  Certificates and
Student Loan Marketing  Association  ("SLMA")  Certificates  and  collateralized
mortgage  obligations  issued  by  private  issuers  for  which  the  underlying
mortgage-backed  securities  serving as  collateral  are  guaranteed by the U.S.
Government  or  its  agencies  or  instrumentalities.  GNMA  is  a  wholly-owned
corporate  instrumentality  of the United States whose securities and guarantees
are backed by the full faith and credit of the United States.  FNMA, a federally
chartered and privately-owned  corporation,  FHLMC, a federal  corporation,  and
SLMA,   a   government    sponsored    stockholder-owned    organization,    are
instrumentalities  of the United States.  The securities and guarantees of FNMA,
FHLMC and SLMA are backed by the credit of the issuing  organization but are not
backed,  directly  or  indirectly,  by the full  faith and  credit of the United
States.  Although  the  Secretary  of the  Treasury  of the  United  States  has
discretionary  authority  to lend FNMA up to $2.25  billion  outstanding  at any
time,  neither the United States nor any agency  thereof is obligated to finance
the operations of FNMA, FHLMC or SLMA or to assist them in any other manner. The
Portfolio may maintain  reasonable amounts of cash or short-term debt securities
for daily cash management purposes or pending selection of particular  long-term
investments.

     GNMA Certificates are mortgage-backed  securities  representing an interest
in a pool of  mortgage  loans.  Such loans are made by lenders  such as mortgage
bankers,   insurance   companies,   commercial   banks  and   savings  and  loan
associations.   Then,   they  are  either   insured  by  the   Federal   Housing
Administration (FHA) or they are guaranteed by the Veterans  Administration (VA)
or Farmers Home  Administration  (FmHA).  The lender or other prospective issuer
creates a specific  pool of such  mortgages,  which it submits  for  approval to
GNMA, a United States  Government  corporation  within the Department of Housing
and Urban Development.  After approval,  a GNMA Certificate is typically offered
by the issuer to investors through securities dealers.

     GNMA  Certificates  differ from bonds in that the principal is scheduled to
be paid back by the borrower on a monthly basis over the life of the loan rather
than returned in a lump sum at maturity. Modified pass-through GNMA Certificates
entitle the holder to receive all interest and  principal  payments  owed on the
mortgages in the pool whether or not the mortgagor  has made such  payment.  The
timely  payment of interest and  principal is  guaranteed  by the full faith and
credit of the United States Government.

     Although the payment of interest and principal is guaranteed, the guarantee
does not extend to the value of a GNMA Certificate or the value of the shares of
the Portfolio.  The market value of a GNMA Certificate  typically will fluctuate
to reflect  changes in prevailing  interest  rates. It falls when rates increase
(as does the  market  value of other  debt  securities)  and it rises when rates
decline  (but it may not rise on a comparable  basis with other debt  securities
because of its prepayment feature), and, therefore, may be more or less than the
face amount of the GNMA  Certificate,  which  reflects the  aggregate  principal
amount of the  underlying  mortgages.  As a result the net asset value of shares
will fluctuate as interest rates change.

     Mortgagors  may pay off their  mortgages  at any time.  Prepayments  of the
mortgages  can affect the market  value of the GNMA  Certificate  and the return
ultimately  received.  Prepayments,  like scheduled  payments of principal,  are
reinvested by the Portfolio at prevailing  interest rates which may be less than
the rate on the GNMA  Certificate.  Prepayments  are likely to  increase  as the
interest  rate  for  new  mortgages  moves  lower  than  the  rate  on the  GNMA
Certificate.  Moreover,  if the GNMA Certificate had been purchased at a premium
above principal  because its rate exceeded  prevailing rates, the premium is not
guaranteed  and a decline  in value to par may  result in a loss of the  premium
especially in the event of prepayment.

     The FNMA and FHLMC  securities  in which  the  Portfolio  invests  are very
similar to GNMA  certificates  as described  above but are not guaranteed by the
full faith and credit of the United States but rather by the agency itself. FNMA
and FHLMC  securities  are rated Aaa by  Moody's  and AAA by  Standard & Poor's.
These ratings  reflect the status of FNMA and FHLMC as federal  agencies as well
as the important role each plays in financing purchases of homes in the U.S.

     Student   Loan   Marketing    Association   is   a   government   sponsored
stockholder-owned  organization  whose goal is to provide liquidity to financial
and  educational  institutions.  SLMA provides  liquidity by purchasing  student
loans,  which are  principally  government  guaranteed  loans  issued  under the
Federal Guaranteed Student Loan Program and the Health Education Assistance Loan
Program.  SLMA  securities  are not  guaranteed by the U.S.  Government  but are
obligations  solely of the  agency.  SLMA  senior  debt issues in which the Fund
invests are rated AAA by Standard & Poor's and Aaa by Moody's.

     There are other  obligations  issued or  guaranteed  by the  United  States
Government   (such  as  U.S.   Treasury   securities)  or  by  its  agencies  or
instrumentalities  that are either supported by the full faith and credit of the
U.S. Treasury or the credit of a particular agency or instrumentality.  Included
in the  latter  category  are  Federal  Home  Loan Bank and Farm  Credit  Banks.
Obligations  not  guaranteed  by the United States  Government  are highly rated
because they are issued by indirect branches of government. Such obligations are
issued as needs  arise by an agency and are traded  regularly  in  denominations
similar to those in which government obligations are traded.

     The Portfolio may enter into contracts  with dealers in securities  whereby
the Portfolio agrees to purchase or sell an agreed-upon  principal amount of the
securities at a specified  price on a certain date. The Portfolio may enter into
similar  purchase  agreements  with issuers of securities  other than  Principal
Mutual Life Insurance Company. The Portfolio may also purchase optional delivery
standby  commitments  which  give the  Portfolio  the  right to sell  particular
securities at a specified price on a specified date.  Failure of the other party
to such a contract or commitment to abide by the terms thereof could result in a
loss to the  Portfolio.  When the  Portfolio  enters  into a forward  commitment
contract to purchase securities,  it assumes the rights and risks of an owner of
the securities, including the risk of price and yield fluctuation. The Portfolio
accrues no interest until the securities are delivered, and although payment for
and  delivery  of the  securities  will occur at a later  date,  it records  the
purchase  price as a liability and  segregates  portfolio  assets having a value
equal to the purchase price.  The availability of liquid assets for this purpose
and the  effect of asset  segregation  on the  Portfolio's  ability  to meet its
current obligations, to honor requests for redemption and to have its investment
portfolio  managed  properly  will limit the extent to which the  Portfolio  may
engage in  forward  commitment  agreements.  Except as may be  imposed  by these
factors,  there is no limit on the percent of the Portfolio's  total assets that
may be committed to transactions in such agreements. The Portfolio intends to be
active in the forward  commitment  market when the return from  holding  forward
positions  appears  to be  greater  than the  return  from  holding  the  actual
securities.  The  Portfolio  will enter into  forward  commitment  contracts  to
purchase  securities for the purpose of acquiring  those  securities and not for
the purpose of investment leverage or to speculate on interest rate changes, but
as  delivery  dates  approach,  a  determination  will be made  whether  to take
delivery of a specific  forward  position,  or sell that  position  and purchase
another forward position.  Because of this strategy,  it is anticipated that its
annual  portfolio  turnover rate should generally exceed 100% and may be as much
as 600% or more,  although  this rate  should  not be  construed  as a  limiting
factor.  The  Portfolio  intends,  however,  to limit  turnover so that realized
short-term gains on securities held for less than three months do not exceed 30%
of gross income in order to qualify as a "regulated  investment  company"  under
the Internal Revenue Code. See "Tax Treatment, Dividends and Distributions." The
effect of a high turnover rate would be to incur more transaction  expenses than
would be incurred at a lower  turnover  rate, and there is no assurance that the
additional  transactions  that cause the higher  turnover  rate would  result in
gains  for  the  Portfolio  or in  sufficient  gains  to  offset  the  increased
transaction expenses.

CERTAIN INVESTMENT POLICIES AND RESTRICTIONS

     Following  is a  discussion  of  certain  investment  practices  that  each
Portfolio may use in an effort to achieve its investment objective.

     Each Portfolio may enter into repurchase  agreements with, and may lend its
portfolio  securities to,  unaffiliated  broker-dealers  and other  unaffiliated
qualified   financial   institutions.   These   transactions   must   be   fully
collateralized  at all times,  but  involve  some credit risk if the other party
should  default on its  obligations,  and the  Portfolio is delayed or prevented
from recovering on the collateral.  See the Statement of Additional  Information
for further  information  regarding the credit risks  associated with repurchase
agreements  and the  standards  adopted by the Board of  Directors  to deal with
those  risks.  Neither  Portfolio  intends  either (i) to enter into  repurchase
agreements that mature in more than seven days if any such investment,  together
with any other illiquid  securities held by the Portfolio,  would amount to more
than 15% of its total assets or (ii) to lend  securities in excess of 33% of its
total assets.

     From time to time, a Portfolio may enter into forward commitment agreements
which call for it to purchase or sell a security on a future date and at a price
fixed at the time the Portfolio  enters into the  agreement.  Each Portfolio may
acquire rights to sell its investments to other parties,  either on demand or at
specific  intervals.  The  International  Securities  Portfolio  may  invest  in
warrants  up to 5% of its  assets,  of which not more than 2% may be invested in
warrants  that  are not  listed  on the New  York,  American  or  Toronto  Stock
Exchanges or the Chicago Board Options Exchange.

     As a matter of fundamental  policy, each Portfolio may borrow money (a) for
temporary  or  emergency  purposes in an amount not to exceed 5% of the value of
the  Portfolio's  total  assets  at the  time of the  borrowing  and (b) for any
purpose from banks in an amount not to exceed one-third of the Portfolio's total
assets  (including the amount  borrowed) less all liabilities  and  indebtedness
other  than  borrowings  deemed  to be  senior  securities  and  while  any such
borrowing  exceeds 5% of the Funds' total  assets,  no  additional  purchases of
investment securities will be made.

     Each Portfolio may purchase  covered spread  options,  which would give the
Portfolio  the right to sell a security that it owns at a fixed dollar spread or
yield spread in  relationship  to another  security that the Portfolio  does not
own, but which is used as a benchmark. Each Portfolio may also purchase and sell
covered financial futures contracts,  options on financial futures contracts and
options on securities and securities  indices,  but will not invest more than 5%
of its assets in initial margin and premiums on financial  futures contracts and
options  thereon.  Each Portfolio may write options on securities and securities
indices to generate  additional  revenue and for hedging  purposes and may enter
into  transactions in financial futures contracts and options on those contracts
for hedging purposes.  The use of futures contracts and options involves certain
risks,  including  their  failure  as  hedges  when the price  movements  of the
securities  underlying the futures and options do not follow the price movements
of the  portfolio  securities  subject to the hedge;  the  inability  to control
losses by closing a position when a liquid  secondary market does not exist; and
the  ability of Invista to predict  correctly  the  direction  of stock  prices,
interest  rates and other market and economic  factors.  Additional  information
about risks is included in the Statement of Additional Information.

     The  International  Securities  Portfolio  may enter into forward  currency
contracts,  currency  futures  contracts  and  options  thereon  and  options on
currencies for hedging and other  non-speculative  purposes.  A forward currency
contract  involves a  privately  negotiated  obligation  to  purchase  or sell a
specific  currency at a future date at a price set at the time of the  contract.
The Portfolio will not enter into a transaction to hedge currency exposure to an
extent greater in effect than the aggregate  market value of the securities held
or to be purchased by the Portfolio that are denominated or generally  quoted in
or currently  convertible  into the currency.  When the Portfolio  enters into a
contract to buy or sell a foreign currency,  it generally will hold an amount of
that  currency,  liquid  securities  denominated  in that  currency or a forward
contract for such  securities  equal to the Portfolio's  obligation,  or it will
segregate  liquid  high  grade  debt  obligations  equal  to the  amount  of the
Portfolio's obligations. The use of currency contracts involves many of the same
risks as  transactions  in futures  contracts and options as well as the risk of
government action through exchange controls or otherwise that would restrict the
ability of the Portfolio to deliver or receive currency.

     Each  Portfolio  may from time to time execute  transactions  for portfolio
securities with, and pay related brokerage  commissions to, Principal  Financial
Securities,  Inc.  a  broker-dealer  that is an  affiliate  of the  Distributor,
Manager and Sub-Advisor for each of the Portfolios.

     The Statement of Additional  Information  includes  additional  information
concerning  the  investment   policies  and   restrictions   applicable  to  the
Portfolios.  Certain investment policies and restrictions are designated in this
Prospectus or in the Statement of Additional  Information as fundamental and may
not be changed as to any Portfolio without approval by the holders of the lesser
of: (i) 67% of the shares of that  Portfolio  represented  at a meeting at which
more than 50% of the outstanding shares of the Portfolio are represented or (ii)
more  than  50% of the  outstanding  shares  of the  Portfolio.  The  investment
objectives of the Portfolios and all other investment  policies and restrictions
described in this Prospectus and the Statement of Additional Information are not
fundamental  and may be changed by the Board of  Directors  without  shareholder
approval.  A change of an investment  objective may result in a Portfolio having
an  investment  objective  different  from  the  objective  which a  shareholder
considered appropriate at the time of investment in the Portfolio.  Shareholders
must be given 30 days prior written notice before the  investment  objectives of
the Portfolios may be changed at the discretion of the Board of Directors.

RISK FACTORS

     An  investment  in the  International  Securities  Portfolio  involves  the
financial and market risks that are inherent in any  investment  in  securities.
These risks include changes in the financial  condition of issuers,  in economic
conditions  generally and in the  conditions in  securities  markets.  They also
include  the  extent  to which  the  prices of  securities  will  react to those
changes.  Investment  in foreign  securities  presents  certain  risks which may
affect net asset  value.  These risks  include,  but are not  limited to,  those
resulting  from  fluctuations  in  currency   exchange  rates,   revaluation  of
currencies,  the  imposition  of  foreign  taxes,  the  withholding  of taxes on
dividends at the source,  future political and economic  developments  including
war,  expropriations,  nationalization,  the  possible  imposition  of  currency
exchange controls and other foreign  governmental laws or restrictions,  reduced
availability of public information concerning issuers, and the fact that foreign
issuers are not generally subject to uniform accounting,  auditing and financial
reporting standards or to other regulatory practices and requirements comparable
to those applicable to domestic  issuers.  Moreover,  securities of many foreign
issuers  may be less  liquid  and  their  prices  more  volatile  than  those of
comparable domestic issuers. In addition, transactions in foreign securities may
be subject to higher  costs,  and the time for  settlement  of  transactions  in
foreign  securities  may be  longer  than the  settlement  period  for  domestic
issuers.  Investment in foreign  securities may also result in higher  custodial
costs and the costs associated with currency conversions.

      An investment in the Mortgage-Backed  Securities Portfolio involves market
risks  associated  with  movements  in  interest  rates.  The  market  value  of
investments  will  fluctuate in response to changes in interest  rates and other
factors.  During periods of falling  interest  rates,  the values of outstanding
long-term fixed-income securities generally rise. Conversely,  during periods of
rising interest rates, the values of such securities generally decline.  Changes
by recognized rating agencies in their ratings of any fixed-income  security and
in the ability of an issuer to make  payments of interest and principal may also
affect  the  value of  these  investments.  Changes  in the  value of  portfolio
securities  will  affect  the net asset  value but will not affect  cash  income
derived from the securities  unless a change results from a failure of an issuer
to pay interest or principal when due.

MANAGER AND INVESTMENT SUB-ADVISOR

     The  Manager  for  the  Funds  is  Princor   Management   Corporation  (the
"Manager"),  an  indirectly  wholly-owned  subsidiary  of Principal  Mutual Life
Insurance  Company,  a mutual life insurance company organized in 1879 under the
laws of the State of Iowa. The address of the Manager is The Principal Financial
Group,  Des Moines,  Iowa 50392.  The Manager was organized on January 10, 1969,
and since that time has managed  various  mutual  funds  sponsored  by Principal
Mutual Life  Insurance  Company.  As of December 31, 1994 the Manager  served as
investment  advisor  for such  funds with  assets  totaling  approximately  $2.0
billion.

     The Manager has executed an agreement with Invista Capital Management, Inc.
("Invista")  under  which  Invista has agreed to assume the  obligations  of the
Manager  to provide  investment  advisory  services  for each  Portfolio  and to
reimburse  the  Manager  for the  other  costs it incurs  under  the  Management
Agreement.  Invista, an indirectly  wholly-owned  subsidiary of Principal Mutual
Life Insurance Company and an affiliate of the Manager,  was founded in 1985 and
manages  investments for  institutional  investors,  including  Principal Mutual
Life.  Assets under  management  at December 31, 1994 were  approximately  $11.2
billion.  Invista's  address is 1500 Hub Tower,  699 Walnut,  Des  Moines,  Iowa
50309.
<PAGE>
     Invista has assigned certain individuals the primary responsibility for the
day-to-day   management  of  each  Fund's   portfolio.   The  persons  primarily
responsible  for the  day-to-day  management of each Fund are  identified in the
table below:
<TABLE>
<CAPTION>

                                         Primarily
       Fund                          Responsible Since                         Person Primarily Responsible

<S>                                   <C>                                 <C>                                                    
Mortgage-Backed Securities            May, 1993                           Martin J. Schafer (BBA degree, University of Iowa). Vice
  Portfolio                           (Fund's inception)                  President, Invista Capital Management Company since 1992.
                                                                          Director - Securities Trading, Principal Mutual Life
                                                                          Insurance Company 1992; Prior thereto, Associate Director.

International Securities              April, 1994                         Scott D. Opsal, CFA (MBA degree, University of
  Portfolio                                                               Minnesota). Vice President, Invista Capital Management,
Inc. since 1987.
</TABLE>

DUTIES PERFORMED BY THE MANAGER AND SUB-ADVISOR

     Under  Maryland law, the business and affairs of the Fund are managed under
the direction of its Board of  Directors.  The  investment  services and certain
other services referred to under the heading "Cost of Manager's Services" in the
Statement of Additional  Information  are furnished to each Portfolio  under the
terms  of a  Management  Agreement  between  the  Fund  and  the  Manager  and a
sub-advisory  agreement  between the Manager and Invista.  Invista  advises each
Portfolio on investment  policies and on the composition of each  Portfolio.  In
this  connection,  Invista  furnishes  to the Board of  Directors a  recommended
investment  program  consistent with each Portfolio's  investment  objective and
policies.  Invista is  authorized,  within the scope of the approved  investment
program,  to determine  which  securities  are to be bought or sold, and in what
amounts.

     The compensation  being paid by each of the  Mortgage-Backed  Portfolio and
the   International   Securities   Portfolio  for   investment   management  and
administrative  services  is  equal  on  an  annual  basis  to  .45%  and  .90%,
respectively,  of the average daily value of its net assets.  The fee payable by
the International Securities Portfolio is higher than that paid by most funds to
their  advisors,  but it is not  higher  than the fees paid by many  funds  with
similar  investment  objectives  and policies and does cover  substantially  all
expenses of the  Portfolio,  unlike many other funds.  The only expenses paid by
each  Portfolio  are brokerage  commissions  on portfolio  transactions,  taxes,
interest (if any) and extraordinary expenses.

The Manager and Invista may purchase at their own expense  statistical and other
information or services from outside  sources,  including  Principal Mutual Life
Insurance  Company.  An  Investment  Service  Agreement  between  the Fund,  the
Manager,  and Principal  Mutual Life Insurance  Company  provides that Principal
Mutual Life  Insurance  Company will  furnish  certain  personnel,  services and
facilities   required  by  the  Manager  and  Invista  in  connection  with  the
performance  of their  services  for each  Portfolio  and that the Manager  will
reimburse Principal Mutual Life Insurance Company for its costs incurred in this
regard.  The Manager serves as dividend  disbursing agent and transfer agent for
each Portfolio.

MANAGERS' COMMENTS

Princor Management  Corporation and Invista,  the adviser and sub-advisor to the
Fund,  are staffed  with  investment  professionals  who manage each  portfolio.
Comments by these individuals in the following  paragraphs  summarize in capsule
form the general  strategy and recent results of each  Portfolio  throughout the
fiscal year ended December 31, 1994. The accompanying charts display results for
the life of the Fund  through  December 31,  1994.  Average  Annual Total Return
figures  provided for each fund in the graphs below  reflect all expenses of the
Fund and  assume all  distributions  are  reinvested  at net asset  value.  Past
performance  is not  predictive  of future  performance.  Returns  and net asset
values fluctuate. Shares are redeemable at current net asset value, which may be
more or less than original cost.

International Securities Portfolio

After once in a lifetime returns in 1993,  international stock markets turned in
unexciting  results in 1994. The most notable factor was currency  moves,  which
contributed  positively to US dollar based  investor  returns in 1994.  Since we
have not hedged foreign currencies the portfolio gained  approximately 5% due to
the weak dollar.  Sweden,  Finland,  and The Netherlands were all  outperforming
markets for the year, and our strategy of owning undervalued  cyclicals paid off
as overweighting in these countries enhanced performance.

Japan was the only major market that enjoyed high returns, and a good portion of
that was driven by the strong yen. We continue to avoid Japan based on its clear
overvaluation  relative to world  markets,  and this  position  will  negatively
affect our  returns  relative  to other  funds as long as Japan  does  well.  In
contrast to Japan,  there were several markets that performed very poorly,  with
the common  factor  between  them being a dramatic  turn in  investor  sentiment
towards greater risk aversion. Hong Kong and Mexico offered investors growth and
good  valuations,  but the shift in risk  aversion  caused  them to be the worst
performing markets for the quarter and the year. Our account was overweighted in
both markets, which negatively impacted relative returns.

Comparison of Changes in Value of $2.5 Million Investment in the International 
Securities Portfolio, Morgan Stanley Capital International EAFE (Europe, 
Australia and Far East) Index and Lipper International Fund Average
                        
                                 International             
                                   Securities                        Lipper
                                    Portfolio        EAFE         International
Year Ended December 31                Value          Index           Average
                                   2,500,000       2,500,000       2,500,000
1993                               3,248,625       2,702,750       3,062,500
1994                               3,039,006       3,148,974       3,040,756

Note:  Past performance is not predictive of future performance.

Important Notes:
Lipper  International  Fund Average:  this average consists of mutual funds
which invest in securities  whose primary trading markets are outside the United
States. The one year average currently contains 121 funds.

Morgan Stanley Capital International EAFE (Europe, Australia and Far East)
Index:  an unmanaged  index  consisting of stocks of 4,552  companies  traded in
twenty major world stock markets.

Mortgage-Backed Securities Portfolio

Our policy is to avoid the various types of derivative  securities  available in
this marketplace and, as a result, we averted the significant  decrease in value
(and the resulting  publicity)  these issues caused  investors in government and
other  fixed-income  securities.  Nevertheless,  we were  unable to  escape  the
decreases in market value which inevitably  accompany a broad and sharp increase
in the general  level of interest  rates,  such as what was  triggered  from the
action of the Federal Reserve in raising  short-term rates in recent months. Our
policy of running a fairly straightforward  portfolio priced at or below par was
instrumental in maintaining our competitive position in the past, but did act to
push  our  prices  to  levels  lower  than  other  funds  investing  in  similar
mortgage-backed  securities.  Their  portfolios  were  structured  more toward a
premium  over par  position.  The worst  may be  behind  us from a total  return
standpoint,  unless the Fed is behind in trying to contain potential  inflation.
If they  are,  then a series  of rate  increases  will be needed in an effort to
lessen the  possibility  of future  inflation.  Although our values and those of
other  fixed-income  funds have fallen in 1994,  the good news,  if any, is that
dividend flows to investors should increase.

Comparison of Changes in Value of $2.5 Million Investment in the Mortgage-Backed
Securities Portfolio, Lehman Brothers Mortgage Index and Lipper U.S. Mortgage 
Fund Average.
                      
                           Mortgage-Backed
                             Securities     Lehman Brothers   Lipper U.S. 
                              Portfolio       Mortgage       Mortgage Fund
Year Ended December 31,         Value           Index          Average
                              2,500,000       2,500,000       2,500,000
1993                          2,611,628       2,580,769       2,584,750
1994                          2,516,864       2,539,307       2,476,966

Note:  Past performance is not predictive of future performance.

Important Notes:

Lehman Brothers Mortgage Index: an unmanaged index of 15- and 30 year fixed rate
securities  backed  by  mortgage  pools  of  the  Government  National  Mortgage
Association (GNMA),  Federal Home Loan Mortgage Corporation (FHLMC), and Federal
National Mortgage Association (FNMA).

Lipper U.S.  Mortgage Fund Average:  this average  consists of mutual funds
investing  at least  65% of  their  assets  in  mortgages/securities  issued  or
guaranteed  as to  principal  and  interest by the U.S.  Government  and certain
federal agencies. The one year average currently contains 73 mutual funds.

NOTE:  Mutual  fund  data  from  Lipper  Analytical  Services,  Inc.

DETERMINATION OF NET ASSET VALUE

     The net asset value of each Portfolio is determined  daily,  Monday through
Friday, as of the close of trading on the New York Stock Exchange except on days
on which changes in the value of the portfolio  securities  will not  materially
affect the current net asset value of the redeemable securities,  on days during
which a Portfolio  receives no order for the purchase or sale of its  redeemable
securities  and no tender of such a security  for  redemption,  and on customary
national business  holidays.  The net asset value per share of each Portfolio is
determined by dividing the value of the  Portfolios'  securities  plus all other
assets, less all liabilities, by the number of Portfolio shares outstanding.

     Securities  for which market  quotations  are readily  available are valued
using those quotations.  Other securities are valued by using market quotations,
prices  provided by market  makers or estimates of market  values  obtained from
yield data and other factors  relating to instruments or securities with similar
characteristics  in accordance with procedures  established in good faith by the
Board of Directors.  Securities with remaining maturities of 60 days or less are
valued at amortized cost. Other assets are valued at fair value as determined in
good faith through procedures established by the Board of Directors of the Fund.

     Trading  of  foreign  securities  is  substantially  completed  each day at
various times prior to the close of the New York Stock  Exchange.  The values of
such  securities  used in  computing  net asset  value  per  share  are  usually
determined  as of such times.  Occasionally,  events  which affect the values of
such securities and foreign currency  exchange rates may occur between the times
at which  they are  generally  determined  and the  close of the New York  Stock
Exchange and would  therefore  not be reflected  in the  computation  of the net
asset value. If events  materially  affecting the value of such securities occur
during such period,  then these securities will be valued at their fair value as
determined in good faith by the Manager or Invista under procedures  established
and  regularly   reviewed  by  the  Board  of  Directors.   To  the  extent  the
International  Securities  Portfolio  invests  in foreign  securities  listed on
foreign  exchanges which trade on days on which the Portfolio does not determine
its net asset value,  for example  Saturdays and other  customary  national U.S.
holidays,  the net asset  value  could be  significantly  affected  on days when
shareholders have no access to the Portfolio.

PERFORMANCE CALCULATION

     From  time  to  time,  the  Fund  may  publish  advertisements   containing
information   (including  graphs,   charts,   tables  and  examples)  about  the
performance of one or more of its Portfolios. The yield and total return figures
described below will vary depending upon market  conditions,  the composition of
portfolios and operating expenses. These factors and possible differences in the
methods used in  calculating  yield and total return should be  considered  when
comparing   performance  figures  for  the  Portfolios  to  performance  figures
published  for other  investment  vehicles.  Any  performance  data quoted for a
Portfolio represents only historical performance and is not intended to indicate
future performance. For further information on how the Fund calculates yield and
total  return  figures  for its  Portfolios,  see the  Statement  of  Additional
Information.

     The  Mortgage-Backed  Securities  Portfolio  may  advertise  its  yield and
average  annual  and  cumulative  total  return.  The  International  Securities
Portfolio may advertise its average annual and cumulative total return. Yield is
determined by annualizing a Portfolio's  net  investment  income per share for a
specific,  historical  30-day  period and  dividing the result by the ending net
asset value of the  Portfolio for the same period.  Average  annual total return
for each Portfolio is computed by calculating the average annual compounded rate
of return over the stated period that would equate an initial $1,000  investment
to the ending  redeemable  value assuming the  reinvestment of all dividends and
capital  gains  distributions  at net asset  value.  Cumulative  total return is
computed by dividing the ending  redeemable  value by the initial  investment on
the basis of the same  assumptions.  Each  Portfolio  may also  quote  rankings,
yields  or  returns  as  published  by  independent   statistical   services  or
publishers, and information regarding the performance of certain market indices.

SHAREHOLDER RIGHTS

     Each  share is  entitled  to one vote  either  in person or by proxy at all
shareholder  meetings.  This  includes  the  right  to vote on the  election  of
directors,  selection of independent  accountants and other matters submitted to
meetings  of  shareholders.  Shares  of  each  Portfolio  generally  vote in the
aggregate  without  regard to series,  except  where  otherwise  required by the
Investment Company Act of 1940 in which case any matter being voted upon must be
approved  by each  Portfolio  affected by the matter  being voted upon.  Matters
required by the Investment Company Act of 1940 to be voted upon by each affected
Portfolio include changes to the Management  Agreement,  a subadvisory agreement
and fundamental investment policies and restrictions.  Each share of a Portfolio
has equal  rights  with every  other share of that  Portfolio  as to  dividends,
earnings,   voting,   assets   and   redemption.   Shares  are  fully  paid  and
non-assessable,  have  no  preemptive  or  conversion  rights,  and  are  freely
transferable.  Shares  may be  issued  as full or  fractional  shares,  and each
fractional share has proportionately  the same rights,  including voting, as are
provided for a full share. Shareholders of the Fund may remove any director with
or without cause by the vote of a majority of the votes entitled to be cast at a
meeting  of  shareholders.   Shareholders  will  be  assisted  with  shareholder
communication  in connection with such matter,  and the Fund will hold a meeting
of  shareholders  for such  purpose  when  requested  to do so in writing by the
holders of 10% or more of the outstanding shares of the Fund.

     The  articles  of  incorporation  of the Fund  provide  that  the  Board of
Directors may increase or decrease the aggregate number of shares which the Fund
has  authority to issue and may create  additional  series of shares at any time
without a shareholder vote.

     The Fund intends to hold meetings of shareholders only when required by law
and at such other times as may be deemed  appropriate by the Board of Directors.
The Fund will hold annual  meetings of  shareholders  only when the  election of
directors by shareholders  is required under the Investment  Company Act of 1940
and special  meetings of shareholders  when the approval by shareholders of such
matters  as  investment  advisory  agreements  and  distribution  agreements  is
required under that Act.

     Shareholder  inquiries  should  be  directed  to the Fund at The  Principal
Financial Group, Des Moines, Iowa 50392.

     NON-CUMULATIVE  VOTING: The shares have non-cumulative  voting rights which
means that the holders of more than 50% of the shares voting for the election of
directors  can elect 100% of the  directors if they choose to do so, and in such
event,  the holders of the remaining shares voting for the election of directors
will not be able to elect any directors.

     As of January 6, 1995,  Principal  Mutual  Life  Insurance  Company and its
subsidiaries  and  affiliates  owned the following  number and percentage of the
outstanding shares of each Portfolio of the Fund:

                                                                Percentage of
                                           Number of         Outstanding Shares
     Portfolio                           Shares Owned              Owned

International Securities Portfolio         1,076,707               77.71%
Mortgage-Backed Securities Portfolio       1,105,062               81.74%

DISTRIBUTION OF INCOME DIVIDENDS AND REALIZED CAPITAL GAINS

     Any dividends from the net income of the International Securities Portfolio
normally will be distributed to shareholders annually and any dividends from the
net  income  of  the  Mortgage-Backed  Securities  Portfolio  will  normally  be
distributed monthly.  Distributions from the International  Securities Portfolio
will be made on the last business day of December to  shareholders  of record on
the preceding business day.  Distributions from the  Mortgage-Backed  Securities
Portfolio  will normally be declared daily and payable on the first business day
of each month to  shareholders  of record at the close of  business  on the last
business  day of the  preceding  month.  A  shareholder  who  redeems the entire
balance of an  account  during the month will  receive  the  dividends  declared
through the date of the redemption.  Net realized  capital gains for each of the
Portfolios,  if any, will be distributed  annually,  generally the last business
day of December to shareholders of record on the preceding  business day. In the
application,  the  shareholder  authorizes  income  dividends  and capital gains
distributions  to be invested in additional  shares at net asset value as of the
payment date, but the  shareholder at any time on ten days written notice to the
Fund and without  charge may have future  dividends  (or  dividends  and capital
gains  distributions)  paid in cash. Any dividends or distributions paid shortly
after a purchase of shares by an investor  will have the effect of reducing  the
per share net asset value by the amount of the dividends or distributions. These
dividends or  distributions  are subject to taxation  like other  dividends  and
distributions, even though they are in effect a return of capital.

TAX-TREATMENT, DIVIDENDS AND DISTRIBUTIONS

     It is the policy of each  Portfolio  to  distribute  substantially  all net
investment  income and net realized gains.  Through such  distributions,  and by
satisfying  certain  other  requirements,  the  Fund  intends  to  qualify  each
Portfolio for the tax treatment accorded to regulated investment companies under
the applicable  provisions of the Internal Revenue Code. This means that in each
year in which a Portfolio so  qualifies,  it will be exempt from federal  income
tax upon the amounts so  distributed  to  investors.  The Tax Reform Act of 1986
imposed an excise tax on mutual funds which fail to  distribute  net  investment
income and capital gains by the end of the calendar year in accordance  with the
provisions  of the Act. The Fund  intends to comply with the Act's  requirements
and to avoid this excise tax.

     When at the  close  of a fiscal  year,  more  than 50% of the  value of the
International  Securities Portfolio's total assets are invested in securities of
foreign corporations, the Fund may elect pursuant to Section 853 of the Internal
Revenue Code to permit Portfolio  shareholders to take a credit (or a deduction)
for foreign income taxes paid by the Fund. In that case, Portfolio  shareholders
should  include  in gross  income for  federal  income  tax  purposes  both cash
dividends  received from the Fund and the amount which the Fund advises is their
pro rata portion of foreign income taxes paid with respect to, or withheld from,
dividends and interest paid to the Fund from its foreign investments.  Portfolio
shareholders  would then be entitled to subtract from their federal income taxes
the  amount of such  taxes  withheld,  or else  treat  such  foreign  taxes as a
deduction from gross income, if that should be more advantageous. As in the case
of   individuals   receiving   income   directly  from  foreign   sources,   the
above-described tax credit for tax deduction is subject to certain limitations.

     Under the federal income tax law, dividends paid from investment income and
from  realized  short-term  capital  gains,  if any,  are  generally  taxable at
ordinary income rates whether received in cash or additional shares.

     Dividends   from   the   International   Securities   Portfolio   and   the
Mortgage-Backed  Securities  Portfolio  are not  expected to qualify for the 70%
dividends received  deduction for corporations.  Dividends and capital gains are
taxable in the year in which distributed, whether received in cash or reinvested
in additional shares. Dividends declared with a record date in December and paid
in January will be deemed to have been  distributed to shareholders in December.
The Fund will  inform  shareholders  of the amount  and  nature of their  income
dividends  and  capital  gains  distributions.  Dividends  from net  income  and
distributions of capital gains may also be subject to state and local taxation.

     The Fund is required by law to withhold 31% of dividends  paid to investors
who do not furnish their correct taxpayer  identification  number, which, in the
case of most  individuals is their social security  number.  If, at the time the
account is  established  the  investor  does not have a taxpayer  identification
number but  certifies  that one has been applied for, such  withholding  will be
delayed but will commence 60 days after the date of such certification if within
such time the investor has not provided such number to the Fund.

     Shareholders should consult their own tax advisors as to the federal, state
and local tax  consequences  of  ownership  of  shares of a  Portfolio  in their
particular circumstances.

HOW TO INVEST

     Investments by check - An account with either  Portfolio may be established
by  submitting  a  completed  application  and check  made  payable  to  Princor
Financial Services  Corporation (the  "Distributor") to the Distributor or other
dealers which it selects.  An  application is attached to this  Prospectus.  All
applications  are subject to acceptance by the Fund and the  Distributor.  If an
application and check are properly submitted to the Distributor, the shares will
be  issued  at the net  asset  value  next  determined  after the check has been
converted  into Federal  Funds,  ordinarily  within one  business day  following
receipt of the check.

     Investments  By Wire - Shares may also be purchased by wiring Federal Funds
directly  to  Norwest  Bank  Iowa,  N.A.,  on a day on which the New York  Stock
Exchange,  Norwest  Bank Iowa,  N.A.,  and, in the case of an initial  purchase,
Princor Financial Services Corporation are open for business. It is possible the
shareholder's  bank will  charge a fee for  transmitting  funds by wire.  FOR AN
INITIAL PURCHASE,  FIRST OBTAIN AN ACCOUNT NUMBER BY TELEPHONING THE DISTRIBUTOR
TOLL FREE  1-800-521-1502.  Princor Financial Services  Corporation requests the
following information:

     1.  Name in which the account will be registered             
     2.  Address and Telephone Number                            
     3.  Tax Identification Number                                    
     4.  Dividend distribution election                           
     5.  Amount being wired and wiring bank
     6.  Name of Princor Financial Services Corporation registered 
         representative, if any.
     7.  Portfolio for which shares are being purchased.

     Princor  Financial  Services  Corporation  will  assign an  account  number
immediately  upon receipt of the above  information.  After an account number is
assigned,  the purchaser should instruct the bank to wire transfer Federal Funds
to:  Norwest Bank Iowa,  N.A.,  Des Moines,  Iowa 50309,  for credit to: Princor
Financial Services  Corporation,  Account Number 073-330; for further credit to:
Purchaser's Name and Account Number.

     Subsequent   purchases  may  be  made  in  the  same  manner.   It  is  the
shareholder's  responsibility to advise Princor Financial  Services  Corporation
when a subsequent purchase has been wired so that proper credit can be given.

     Payment of Federal  Funds  normally must be received by Norwest Bank before
3:00 p.m.  Central  Time for an order to be  accepted on that day. If payment is
received after that time, the order will not be accepted until the next business
day. Wire  transfers may take two hours or more to complete.  Investors may make
special  arrangements to transmit orders for Portfolio shares to the Distributor
prior to 3:00 p.m.  (Central  Time) on a day when the Fund is open for  business
with the  investor's  assurance  that  payment  for such  shares will be made by
wiring  Federal Funds  directly to Norwest Bank Iowa,  N.A.  prior to 10:00 a.m.
(Central Time) the following  regular business day. Such orders will be effected
at the Portfolio's net asset value per share next determined after such purchase
order is received by the Distributor.

     Promptly after the initial  purchase,  INVESTORS SHOULD COMPLETE AN ACCOUNT
APPLICATION and mail to Princor Financial Services Corporation,  P.O. Box 10423,
Des Moines, Iowa 50306-0423.

     Investments  through a Selected  Dealer - If the application and settlement
funds are  submitted  through a selected  dealer,  the shares  will be issued in
accordance  with the following:  An order accepted by a dealer on any day before
the  close  of the  Exchange  and  received  by  the  Distributor  as  principal
underwriter before the close of its business on that day will be executed at the
net asset value  computed as of the close of the  Exchange on that day. An order
accepted  by such dealer  after the close of the  Exchange  and  received by the
Distributor before its closing on the following business day will be executed at
the net asset value  computed as of the close of the Exchange on such  following
business  day.  Dealers  have  the  responsibility  to  transmit  orders  to the
Distributor  promptly.  After an open  account has been  established  (see "Open
Account  System"),  purchases  will be executed at the price next computed after
receipt of the  investor's  funds at the main  office of the  Distributor.  Wire
purchases through a selected dealer may involve other procedures  established by
that dealer.

OFFERING PRICE OF  SHARES

     The Fund  offers  shares of each  Portfolio  continuously  through  Princor
Financial Services  Corporation which is the principal  underwriter for the Fund
and sells  shares as agent for the Fund.  Shares  are sold to the  public at net
asset  value,  subject  to  the  minimum  investment  requirements.  In  certain
circumstances,  Princor  Financial  Services  Corporation  will  compensate  its
registered  representatives or a selected dealer with whom it has entered into a
selling  agreement  for  their  efforts  in  distributing  shares  of the  fund.
Compensation  will be an ongoing  fee in an amount up to 0.10% on an  annualized
basis of the average  net asset  value of shares held in a customer  account the
establishment  of  which  is  attributable  to the  efforts  of  the  registered
representative or selected dealer.

MINIMUM INVESTMENT REQUIREMENT

     The  minimum  initial  purchase  in the Fund is $1.5  million.  The minimum
initial  purchase of $1.5  million may be  invested  over a three month  period.
Investments in both Portfolios by an investor, the investor's spouse,  dependent
children or a trustee may be combined to meet this minimum.  There is no minimum
for  additional  investments.  If  the  total  $1.5  million  investment  is not
completed within the three month period, the shareholder will be given notice of
the additional  investment needed to meet the minimum and if not remitted within
30 days, the account will be redeemed.

OPEN ACCOUNT SYSTEM

     Share   certificates   will  not  ordinarily  be  issued  to  shareholders.
Shareholders  of each  Portfolio  will  receive a statement of account each time
they invest.  The  statement  will record the current  investment  and the total
number of shares then owned.

     The Fund  treats the  statement  of account as  evidence  of  ownership  of
shares.  This is known as an open  account  system.  It avoids the  trouble  and
expense of  safeguarding  share  certificates  and the cost of a lost instrument
bond if certificates are lost or destroyed. Certificates, which can be stolen or
lost, are unnecessary except for special purposes such as collateral for a loan.
A shareholder may obtain a certificate at any time for full shares by requesting
it from the Fund in writing.  The certificate  will be delivered  promptly at no
cost. In cases where  certificates  have been issued,  the  certificate  must be
surrendered in connection with a redemption, transfer or exchange.

     The Fund has  adopted  the  policy of  requiring  signature  guarantees  in
certain  circumstances to safeguard  shareholder accounts. A signature guarantee
is necessary under the following circumstances:

     1.  If a redemption payment is to be made payable to a payee other than the
         registered shareholder or joint shareholders, or to Principal Mutual 
         Life Insurance Company or any of its affiliated companies;

     2.  To change the ownership of the account;

     3.  If a  redemption  payment is to be mailed to an address  other than the
         address  of record or to an  address  of record  that has been  changed
         within the preceding three months.

     4.  To add telephone transaction services to an account after the initial 
         application is processed.

     5.  To change the designated commercial bank account authorized to accept 
         redemption proceeds.

     A shareholder's  signature must be guaranteed by a commercial  bank,  trust
company,  credit  union,  savings  and  loan  association,  national  securities
exchange member, or brokerage firm. A signature guaranteed by a notary public is
not acceptable.

     Although   there   currently   is  no   minimum   balance,   due   to   the
disproportionately  high cost of maintaining  small accounts,  the Fund reserves
the right to redeem all shares in an  account  with a value of less than  $5,000
and to mail the proceeds to the shareholder. Involuntary redemptions will not be
triggered solely by market activity.  Shareholders will be notified before these
redemptions  are to be made  and will  have  thirty  days to make an  additional
investment to bring their accounts up to the required minimum. The Fund reserves
the right to increase the required minimum.

     All orders are subject to acceptance by the Fund and the  Distributor.  The
Fund's  Board of  Directors  reserves  the  right  to  change  or waive  minimum
investment  requirements at any time, which would be applicable to all investors
alike.

REDEMPTION OF SHARES

     Each Portfolio will redeem its shares upon request.  There is no charge for
redemptions.    Princor   Financial   Services   usually   requires   additional
documentation  for the sale of shares by a  corporation,  partnership,  agent or
fiduciary,  or a surviving joint owner.  Contact Princor Financial  Services for
details. Shareholders may redeem in one of two ways:

     By Mail - If no certificates have been issued, a shareholder  simply writes
a letter to the Fund, at Princor Financial Services Corporation, P.O. Box 10423,
Des Moines,  Iowa  50306-0423,  requesting  redemption of any part or all of the
shares  owned by  specifying  either a dollar or share  amount.  The letter must
provide  the  account  number,   shareholder  social  security  number,  or  tax
identification  number and be signed by a registered owner. If certificates have
been issued,  they must be properly  endorsed and forwarded  with the redemption
request.  If  redemption  proceeds  are to be sent by  wire  transfer  to a bank
account  previously  designated as authorized to accept a wire  transfer,  or if
payment is to be mailed to the  address of  record,  which has not been  changed
within the three month period  preceding  the  redemption  request,  and is made
payable to the  registered  shareholder or joint  shareholders,  or to Principal
Mutual Life Insurance Company or any of its affiliated companies,  the Fund will
not require a signature guarantee as a part of a proper  endorsement;  otherwise
the  shareholder's  signature  must be guaranteed  by either a commercial  bank,
trust company,  credit union, savings and loan association,  national securities
exchange  member,  or by a brokerage  firm. A signature  guaranteed  by a notary
public or savings bank is not acceptable.

     By  Telephone  -  Shareholders  may, by  telephone,  direct  proceeds  from
redemptions from the shareholder's  account to be sent to the address of record,
if such address has not changed within the three month period preceding the date
of the request, or transferred to a commercial bank account in the United States
previously  authorized in writing by the shareholder.  The telephone  redemption
privilege  is  available  only if telephone  transaction  services  apply to the
account from which shares are redeemed.  Telephone transaction services apply to
all accounts,  unless the shareholder has specifically  declined this service on
the account  application  or in writing to the Fund. If  certificates  have been
issued, the telephone  redemption privilege will not be allowed on those shares.
Shareholders  may exercise the  telephone  redemption  privilege by  telephoning
1-800-521-1502.  If all telephone lines are busy, shareholders might not be able
to request  telephone  redemptions  and would have to submit written  redemption
requests.  Redemption proceeds may be sent to the previously  designated bank by
check or wire transfer.  A wire charge of up to $15.00 will be deducted from the
account from which the  redemption is made for all wire  transfers.  If proceeds
are to be used to  settle  a  securities  transaction  with a  selected  dealer,
telephone  redemptions may be requested by the  shareholder or upon  appropriate
authorization from an authorized  representative of the dealer, and the proceeds
will be wired to the dealer.

     Telephone  redemption requests must be received by the Fund by the close of
the New York Stock  Exchange  on a day when the Fund is open for  business to be
effective  that day.  Requests made after that time or on a day when the Fund is
not open for business will be effective the next business day. Although the Fund
and the transfer agent are not  responsible  for the  authenticity of redemption
requests  received  by  telephone,  the right is  reserved  to refuse  telephone
redemptions  when in the  opinion  of the  Fund or the  transfer  agent it seems
prudent to do so. The shareholder  bears the risk of loss caused by a fraudulent
telephone  redemption request which the Fund reasonably  believes to be genuine.
The  Fund  will  employ  reasonable  procedures  to  confirm  that  instructions
communicated  by telephone are genuine and if such  procedures are not followed,
the  Fund  may  be  liable  for  losses  due  to   unauthorized   or  fraudulent
transactions.  Such  procedures  include  requiring  the caller to  provide  the
shareholder's social security number or tax identification number, date of birth
(if an individual)  and current  address;  mailing  written  confirmation of the
transaction to the address of record; and recording telephone  instructions.  In
addition,  the Fund  directs  redemption  proceeds  made payable to the owner or
owners of the account  only to the  address of record that has not been  changed
within the three month period prior to the date of the telephone request or to a
previously authorized bank account.

     General -  Redemptions,  whether in writing or by telephone or other means,
by any joint owner shall be binding  upon all joint  owners.  The price at which
the shares are redeemed will be the net asset value per share as next determined
after the  request is  received  by the Fund in proper and  complete  form.  The
amount  received for shares upon redemption may be more or less than the cost of
such  shares  depending  upon the net  asset  value  at the time of  redemption.
Accurate  records  should  be  kept  for the  duration  of the  account  for tax
purposes.

     Redemption  proceeds  will be sent  within  seven days  after  receipt of a
request for redemption in proper form.  However,  the Fund may suspend the right
of redemption  during any period when (a) trading on the New York Stock Exchange
is restricted as determined by the  Securities  and Exchange  Commission or such
Exchange  is closed for other  than  weekends  and  holidays;  (b) an  emergency
exists, as determined by the Securities and Exchange Commission,  as a result of
which  (i)  disposal  by the Fund of  securities  owned by it is not  reasonably
practicable,  or (ii) it is not  reasonably  practicable  for the Fund fairly to
determine the value of its net assets; or (c) the Commission by order so permits
for the protection of security holders of the Fund.

     Occasionally  the Fund may be  requested to redeem  Portfolio  shares which
have been purchased by check for which it has not yet received good payment.  If
this happens,  the Fund may delay transmittal of redemption  proceeds until good
payment has been collected for the purchase of such shares (which may take up to
15 days or more).  To avoid the  inconvenience  of such a delay,  shares  may be
purchased with a certified check, bank cashier's check or money order.

     The Fund  reserves the right to modify any of the methods of  redemption or
to  charge  a  fee  for  providing   these   services  upon  written  notice  to
shareholders.

PERIODIC WITHDRAWAL PLAN

     A  shareholder  may request  that a fixed  number of shares  ($100  initial
minimum  amount)  or enough  shares to  produce  a fixed  amount of money  ($100
initial  minimum  payment)  be  withdrawn  from an account  monthly,  quarterly,
semi-annually  or annually.  The Fund makes no  recommendation  as to either the
number of shares or the fixed amount that the investor may withdraw. An investor
may initiate a Periodic  Withdrawal  Plan by signing an  Agreement  for Periodic
Withdrawal Form and depositing any share  certificates that have been issued or,
if no certificates have been issued and telephone  transaction services apply to
the account, by telephoning the Fund.

     Cash  withdrawals  are made out of the  proceeds of  redemption  on the day
designated by the  shareholder,  so long as the day is a trading day that is the
1st  through  the 28th day of the  month,  and will  continue  until  cancelled.
Withdrawal  payments will be sent on or before the fifth  business day following
such redemption.  The redemption of shares to make payments under this Plan will
reduce and may eventually exhaust the account.

     Each  redemption  of  shares  may  result  in a gain or loss,  which may be
reportable for income tax purposes.  An investor  should keep an accurate record
of any gain or loss on each  withdrawal.  Any income  dividends or capital gains
distributions on shares held under a Periodic  Withdrawal Plan are reinvested in
additional  shares at net asset  value.  Withdrawals  may be stopped at any time
without penalty, subject to notice in writing which is received by the Fund.

ADDITIONAL INFORMATION

     Organization: The Fund was incorporated in the state of Maryland on 
January 28, 1993.

     Custodian:  Bank of America  National  Trust and Savings  Association,  555
California  Street,  San  Francisco,  California  94105,  is  custodian  of  the
portfolio   securities  and  cash  assets  of  the  Mortgage-Backed   Securities
Portfolio.  The custodian for the  International  Securities  Portfolio is Chase
Manhattan Bank,  N.A.,  Chase Metro Tech Center,  Brooklyn,  New York 11245. The
custodians perform no managerial or policymaking functions for the Fund.

     Capitalization: The authorized capital stock of each Portfolio consists of
100,000,000 shares of common stock, $.01 par value.

     Financial  Statements:  Copies of the financial statements of the Fund will
be mailed to each shareholder  semi-annually.  At the close of each fiscal year,
the  Fund's  financial  statements  will be  audited  by a firm  of  independent
auditors.  The  firm of  Ernst & Young  LLP has  been  appointed  to  audit  the
financial statements of the Fund.

     Registration Statement: This Prospectus omits some information contained in
the  Statement  of  Additional   Information  (also  known  as  Part  B  of  the
Registration  Statement) and Part C of the Registration Statement which the Fund
has filed with the Securities and Exchange  Commission.  The Fund's Statement of
Additional Information is hereby incorporated by reference into this Prospectus.
A copy of this Statement of Additional Information can be obtained upon request,
free  of  charge,  by  writing  or  telephoning   Princor   Financial   Services
Corporation. You may obtain a copy of Part C of the Registration Statement filed
with  the  Securities  and  Exchange  Commission,   Washington,  D.C.  from  the
Commission upon payment of the prescribed fees.

     Principal  Underwriter:  Princor Financial Services  Corporation,  
P.O. Box 10423, Des Moines,  Iowa 50306-0423,  is the principal underwriter for 
the Fund.

     Transfer  Agent  and  Dividend   Disbursing   Agent:   Princor   Management
Corporation, The Principal Financial Group, Des Moines, Iowa, 50392-0200, is the
transfer agent and dividend disbursing agent for the Fund.
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