ADVANTUS BOND FUND INC
N-30D, 1998-06-01
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<PAGE>

                                                                          [LOGO]


                                              Semi-Annual Report to Shareholders
                                                              Advantus Bond Fund


                                                                  March 31, 1998

<PAGE>
ADVANTUS BOND FUND
TABLE OF CONTENTS
 
PERFORMANCE UPDATE                            2
 
INVESTMENTS IN SECURITIES                     7
 
STATEMENT OF ASSETS AND LIABILITIES          10
 
STATEMENT OF OPERATIONS                      11
 
STATEMENTS OF CHANGES IN NET ASSETS          12
 
NOTES TO FINANCIAL STATEMENTS                13
 
SHAREHOLDER SERVICES                         18
<PAGE>
LETTER FROM THE PRESIDENT                                                [PHOTO]
 
Dear Shareholders:
 
Investors experienced a positive financial environment with moderate economic
growth and low inflation throughout the six-month reporting period. Fears of
inflation in our economy have dissipated as negative economic events in Asia
unfolded and took on global implications earlier in the reporting period.
 
The "Asian Flu" severely affected several Far Eastern currencies and stock
markets, leaving a trail of bankruptcies, uncertainties, and fears in its wake.
In fact, a "flight to quality" poured assets into U.S. markets, particularly the
bond market, which is a popular destination for investors during periodic
flights to quality.
 
Broadly speaking, both equity and fixed income securities have demonstrated
notable results this reporting period. Indices, such as the S&P 500,* which
returned 16.3 percent at the end of the six-month period; and the Lehman
Brothers Government Corporate Bond Index,** which returned 4.8 percent for the
same period, reflected the GENERAL strength of the equity and fixed income
markets respectively.
 
As investors, we all enjoy "market watching." We have witnessed the financial
markets change, sometimes significantly, because of actual events or because of
mere perceptions in those markets. Keeping a long-range view of investing is
important because it smoothes out the highs and lows. We believe that investors
derive the greatest benefit by maintaining a long-range perspective on
investing.
 
The investment professionals at Advantus Capital Management continue to put
their money management expertise to work on your behalf. We appreciate your
continued participation in the Advantus Funds and urge you to maintain a
long-term investment perspective.
 
Sincerely,
 
       [SIGNATURE]
Robert E. Hunstad, President
Advantus Funds
 
 *The S&P 500 is a broad, unmanaged index of 500 common stocks which are
representative of the U.S. stock market overall. The Index includes
approximately 380 industrials, 10 transportations, 45 financials, and 65
utilities.
 
**The Lehman Brothers Government Corporate Bond Index is an unmanaged benchmark
composite of the Lehman Brothers Government Bond Index which includes all
publicly issued debt of the U.S. Government and Agencies and The Lehman Brothers
Corporate Bond Index which includes all publicly issued, fixed rate,
nonconvertible investment grade dollar-denominated, SEC registered corporate
debt.
<PAGE>
ADVANTUS BOND FUND
PERFORMANCE UPDATE
 
    [PHOTO]
WAYNE SCHMIDT, CFA
PORTFOLIO MANAGER
The Advantus Bond Fund is a mutual fund
designed for investors seeking a high
level of current income consistent with
prudent investment risk. The Fund plans
to achieve its objective primarily by
investing in a diversified portfolio of
investment grade short, intermediate and
long-term debt securities. The Fund
manager varies the proportion of assets
invested in each maturity category
depending upon the evaluation of market
patterns and economic trends by the
Fund's investment adviser.
  -Dividends declared daily and paid monthly.
  -Capital gains distributions paid annually.
PERFORMANCE
 
The Advantus Bond Fund's performance for the six month period ended March 31,
1998, for each class of shares offered was as follows:
 
<TABLE>
<S>                                <C>
Class A..........................  4.1 percent*
Class B..........................  3.6 percent*
Class C..........................  3.7 percent*
</TABLE>
 
Its benchmark, the Lehman Brothers Government Corporate Bond Index,** returned
4.8 percent for the same period.
In prior reporting periods, the Lehman Brothers Corporate Bond Index+ was used
as the Fund's benchmark. The current benchmark, the Lehman Brothers Government
Corporate Bond Index,** better fits our stated investment objective than did the
Lehman Brothers Corporate Bond Index.+
PORTFOLIO ANALYSIS
The fixed income markets continue to be locked in battle between strong economic
growth and low inflation. The past six months saw interest rates trade in a
tight range, and they finished the period at the lower end of the range. The
two-, five- and 10-year U.S. Treasury notes declined between 22 and 45 basis
points to yield 5.56 percent, 5.61 percent and 5.65 percent, respectively, while
the 30-year bond declined 47 basis points to yield 5.93 percent.
Among the three major sectors in the bond market; corporates, mortgages and
treasuries, performance was quite even for the period. Corporate bonds overcame
a difficult fourth quarter in calendar year 1997 and a poor January 1998
performance as credit spreads widened due the Asian crisis, a heavy new supply
of corporate bonds and an overall lack of liquidity. Corporate bond buyers
returned to the market in early February, and by the end of March, corporate
bonds had regained much of their spread widening. Mortgage-backed securities
tend to perform well in a stable interest rate environment, as was the case
during this period. U.S. Treasuries continue to be in strong demand as a
balanced fiscal budget and talk of reduced treasury supply in the upcoming
months have created a strong bid for that market.
 
The Fund's relative overweighting in corporate bonds was a drag on performance
during the first four months of the period. We maintained the corporate
positions and were rewarded in February and March as credit spreads began to
tighten. Improving credit trends in Time Warner Incorporated, Lehman Brothers,
Inc., and Morgan Stanley Dean Witter helped these positions appreciate as their
credit spreads tightened. The U.S. Treasury portion of the Fund was used to
adjust the duration of the Fund from a neutral position of 5.4 years to 5.8
years at the end of the period. Exposure to cash was kept below 5 percent of the
Fund.
 
                       2
<PAGE>
                                                              ADVANTUS BOND FUND
                                                                  MARCH 31, 1998
 
OUTLOOK
 
In the Fund, we will maintain the overweighting in the corporate bond sector. We
believe the fundamentals of this market should continue to be as attractive as
they were during the last eight weeks of the period. Corporate cash flows and
profits appear to be strong again thus far in 1998. This will set the stage for
credit rating agencies to issue more credit upgrades than downgrades.
 
We will continue to use the U.S. Treasury market to adjust the duration of the
Fund. We believe that 30-year U.S. Treasury Bonds will trade this year in a
range between 5.4 percent and 6.2 percent. As either extreme is approached, we
will use this as an opportunity to shorten or lengthen the Fund duration. This
will provide an opportunity to turn interest rate volatility into incremental
returns for the Fund.
 
Growth and inflation will likely drive the overall interest rate environment in
the U.S. Currently we have strong growth with low inflation, and the market is
at equilibrium. If growth slows and inflation remains low, we believe long bond
yields will be at 5 percent. If growth continues to be strong and inflation
rises, bond yields will likely spike higher, potentially reaching 6.5 to 7
percent. Our view, given the Asian crisis, the strong U.S. dollar, a recession
in Japan, and the coming of the European Monetary Union, is that U.S. economic
growth will likely begin to slow during the second half of 1998, paving the way
for lower interest rates. This will be positive for bond fund investors who may
expect to achieve mid to high single-digit return potential for the year.
*Historical performance is not an indication of future performance. These
performance results do not reflect the impact of Class A's maximum 5 percent
front-end sales charge or Class B's maximum 5 percent contingent deferred sales
charge. Investment returns and principal values will fluctuate so that shares
upon redemption may be worth more or less than their original cost.
**The Lehman Brothers Government Corporate Bond Index is an unmanaged benchmark
composite of the Lehman Brothers Government Bond Index which includes all
publicly issued debt of the U.S. Government and Agencies and The Lehman Brothers
Corporate Bond Index which includes all publicly issued, fixed rate,
nonconvertible investment grade dollar-denominated, SEC registered corporate
debt.
+The Lehman Brothers Corporate Bond Index includes all publicly issued, fixed
rate, nonconvertible investment grade dollar-denominated, SEC registered
corporate debt.
 
                                                       3
<PAGE>
ADVANTUS BOND FUND
MARCH 31, 1998
 
                COMPARISON OF CHANGE IN VALUE OF A HYPOTHETICAL
                   $10,000 INVESTMENT IN ADVANTUS BOND FUND,
                     LEHMAN BROTHERS CORPORATE BOND INDEX,
              LEHMAN BROTHERS GOVERNMENT CORPORATE BOND INDEX, AND
                              CONSUMER PRICE INDEX
 
On the following charts you can see how the total return for each of the three
classes of shares of the Advantus Bond Fund compared to the Lehman Brothers
Corporate Bond Index, Lehman Brothers Government Corporate Bond Index, and the
Consumer Price Index. The four lines in the Class A graph represent the
cumulative total return of a hypothetical $10,000 investment made on March 31,
1988 through March 31, 1998. The four lines in the Class B and Class C graphs
represent the cumulative total return of a hypothetical $10,000 investment made
on the inception date of Class B and Class C shares of Advantus Bond Fund
(August 19, 1994 and March 1, 1995 for Class B and C, respectively) through
March 31, 1998.
 
                                    CLASS A
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
   AVERAGE ANNUAL TOTAL
         RETURN:
<S>                         <C>        <C>               <C>        <C>
One year                         6.6%
Five year                        5.4%
Ten year                         7.8%
(Thousands)
                                        Lehman Brothers              Lehman Brothers
                                              Corporate                   Government
                              Class A        Bond Index        CPI   Corporate Index
3/31/88                       $10,000           $10,000    $10,000           $10,000
10/31/88                        9,788            10,532     10,292            10,470
10/31/89                       10,851            11,839     10,763            11,741
10/31/90                       11,335            12,344     11,441            12,387
10/31/91                       12,995            14,520     11,775            14,291
10/31/92                       14,391            16,132     12,153            15,796
10/31/93                       16,413            18,579     12,479            17,990
9/30/94                        15,317            17,659     12,856            17,178
9/30/95                        17,623            20,660     13,139            19,351
9/30/96                        18,332            21,640     13,533            20,222
9/30/97                        20,270            23,986     13,834            22,163
3/31/98                        21,101            25,063     13,894            24,806
</TABLE>
 
                                    CLASS B
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                                                                    LEHMAN BROTHERS
 
<S>                         <C>        <C>               <C>        <C>
                                        Lehman Brothers                   Government
                              Class B   Corporate Index        CPI   Corporate Index
8/19/94                       $10,000           $10,000    $10,000           $10,000
9/30/94                         9,876             9,819     10,067             9,853
9/30/95                        10,801            11,488     10,289            11,099
9/30/96                        11,252            12,033     10,598            11,599
9/30/97                        12,480            13,337     10,833            12,712
3/31/98                        12,934            13,936     10,880            14,228
Average annual total
return:
One year                         6.1%
Since inception (8/19/94)        7.4%
(Thousands)
</TABLE>
 
                       4
<PAGE>
                                                              ADVANTUS BOND FUND
                                                                  MARCH 31, 1998
 
                                    CLASS C
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                                                                    LEHMAN BROTHERS
 
<S>                         <C>        <C>               <C>        <C>
                                        Lehman Brothers                   Government
                              Class C   Corporate Index        CPI   Corporate Index
3/01/95                       $10,000           $10,000    $10,000           $10,000
9/30/95                        10,925            11,087     10,146            10,939
9/30/96                        11,265            11,613     10,450            11,431
9/30/97                        12,348            12,872     10,682            12,529
3/31/98                        12,801            13,450     10,728            14,023
Average annual total
return:
One year                        11.3%
Since inception (3/1/95)         8.3%
(Thousands)
</TABLE>
 
The preceding charts are useful because they provide you with more information
about your investments. There are limitations, however. An index may reflect the
performance of securities that the Fund may not hold. Also, the index does not
deduct sales charges, investment advisory fees and other fund expenses, whereas
your Fund does. Performance presented for the Fund reflects the deduction of the
maximum 5 percent front-end sales charge for Class A shares and the maximum
applicable contingent deferred sales charge for Class B shares. Sales charges
pay for your financial professional's investment advice. Individuals cannot buy
even an unmanaged index fund without incurring some charges and expenses.
 
Historical performance is not an indication of future performance. Investment
returns and principal values will fluctuate so that shares upon redemption may
be worth more or less than their original cost.
 
                                                       5
<PAGE>
ADVANTUS BOND FUND
MARCH 31, 1998
 
TEN LARGEST BOND HOLDINGS
 
<TABLE>
<CAPTION>
                                  MARKET      % OF BOND
COMPANY                            VALUE      PORTFOLIO
- ------------------------------  -----------  -----------
<S>                             <C>          <C>
US Treasury Note--6.375%,
 09/30/01.....................  $ 2,604,983      11.0%
US Treasury Note--6.125%,
 11/15/27.....................    1,640,499       6.9%
Lehman Brothers, Inc.--6.625%,
 02/15/08.....................      995,520       4.2%
FNMA--6.140%, 03/24/03........      995,267       4.2%
Time Warner Incorporated-144A
 Issue-- 6.100%, 12/30/01.....      989,220       4.2%
PNC Bank Corporation--6.728%,
 01/25/07.....................      931,370       3.9%
Morgan Stanley Dean
 Witter--6.875%, 03/01/07.....      923,167       3.9%
Sony Corporation--6.125%,
 03/04/03.....................      897,278       3.8%
TCI Communications--8.750%,
 08/01/15.....................      872,055       3.7%
Bradley Operating LP--7.000%,
 11/15/04.....................      855,303       3.6%
                                -----------       ---
                                $11,704,662      49.4%
                                -----------       ---
                                -----------       ---
</TABLE>
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
        U.S. TREASURY            15.7%
<S>                            <C>
U.S. Government Agencies            6.5%
AAA Rated                          10.6%
AA Rated                            3.9%
A Rated                            22.8%
BBB Rated                          26.2%
BB Rated                            1.7%
Preferred Stock                     8.0%
Cash & Other
Assets/Liabilities                  4.6%
</TABLE>
 
                       6
<PAGE>
ADVANTUS BOND FUND
INVESTMENTS IN SECURITIES
 
MARCH 31, 1998
 
                                                                     (UNAUDITED)
 
           (Percentages of each investment category relate to total net assets.)
 
<TABLE>
<CAPTION>
                                                                                     MARKET
PRINCIPAL                                                                           VALUE(a)
- ----------                                                                         -----------
<C>          <S>                                                <C>      <C>       <C>
LONG-TERM DEBT SECURITIES (87.4%)
  GOVERNMENT OBLIGATIONS (25.5%)
    U.S. TREASURY (15.7%)
$1,600,000   US Treasury Note.................................   6.125%  11/15/27  $ 1,640,499
 2,550,000   US Treasury Note.................................   6.375%  09/30/01    2,604,983
                                                                                   -----------
                                                                                     4,245,482
                                                                                   -----------
    FEDERAL NATIONAL MORTGAGE ASSOCIATION (4.9%)
 1,000,000   FNMA.............................................   6.140%  03/24/03      995,267
   318,888   FNMA.............................................   7.000%  09/01/17      325,530
                                                                                   -----------
                                                                                     1,320,797
                                                                                   -----------
    GOVERNMENT NATIONAL MORTGAGE ASSOCIATION (1.6%)
   217,800   GNMA.............................................   7.000%  04/15/22      220,664
   199,959   GNMA.............................................   7.000%  03/15/23      202,467
                                                                                   -----------
                                                                                       423,131
                                                                                   -----------
    STATE AND LOCAL GOVERNMENT OBLIGATIONS (3.3%)
   400,000   California Housing Finance Agency................   7.760%  08/01/25      411,000
   250,000   California Housing Finance Agency................   8.160%  02/01/28      262,500
   236,613   Wyoming Community Development....................   6.850%  06/01/10      237,205
                                                                                   -----------
                                                                                       910,705
                                                                                   -----------
             Total government obligations (cost: $6,801,506).....................    6,900,115
                                                                                   -----------
  CORPORATE OBLIGATIONS (61.9%)
    CAPITAL GOODS (2.8%)
      Waste Management (2.8%)
   750,000   WMX Technologies, Inc............................   6.250%  10/15/00      747,769
                                                                                   -----------
    COMMUNICATION SERVICES (2.8%)
      Telecommunication (2.8%)
   750,000   Cable and Wireless Communication (b).............   6.625%  03/06/05      753,904
                                                                                   -----------
    CONSUMER CYCLICAL (5.0%)
      Building Materials (1.7%)
   450,000   Masco Corporation................................   6.125%  09/15/03      447,977
                                                                                   -----------
      Leisure (3.3%)
   900,000   Sony Corporation (b).............................   6.125%  03/04/03      897,278
                                                                                   -----------
    CONSUMER STAPLES (11.7%)
      Beverage (1.9%)
   500,000   Anheuser-Busch Companies, Inc....................   7.100%  06/15/07      520,109
                                                                                   -----------
      Broadcasting (3.2%)
   750,000   TCI Communications...............................   8.750%  08/01/15      872,055
                                                                                   -----------
</TABLE>
 
              See accompanying notes to investments in securities.
 
                                       7
<PAGE>
ADVANTUS BOND FUND
INVESTMENTS IN SECURITIES--CONTINUED
 
<TABLE>
<CAPTION>
                                                                                     MARKET
PRINCIPAL                                                                           VALUE(a)
- ----------                                                                         -----------
  CORPORATE OBLIGATIONS--CONTINUED
<C>          <S>                                                <C>      <C>       <C>
      Entertainment (3.6%)
$1,000,000   Time Warner Incorporated-144A Issue (c)..........   6.100%  12/30/01  $   989,220
                                                                                   -----------
      Household Product (3.0%)
   750,000   Premark International, Inc.......................  10.500%  09/15/00      823,033
                                                                                   -----------
    ENERGY (2.0%)
      Oil & Gas (2.0%)
   500,000   Baroid Corporation...............................   8.000%  04/15/03      540,043
                                                                                   -----------
    FINANCIAL (34.9%)
      Banks (5.8%)
   700,000   St. George Bank-144A Issue (b)(c)................   8.485%  12/31/49      734,090
   800,000   Wells Fargo Capital..............................   7.960%  12/15/26      836,186
                                                                                   -----------
                                                                                     1,570,276
                                                                                   -----------
      Collateralized Mortgage Obligations/Asset-Backed Securities (4.5%)
   300,000   CFSB Finance Company-144A Issue (c)..............   7.180%  11/15/05      298,875
   900,000   PNC Bank Corporation.............................   6.728%  01/25/07      931,370
                                                                                   -----------
                                                                                     1,230,245
                                                                                   -----------
      Commercial Finance (2.8%)
   750,000   General Electric Capital Corporation.............   6.660%  05/01/18      760,362
                                                                                   -----------
      Consumer Finance (3.0%)
   800,000   Associates Corporation of North America..........   6.625%  05/15/01      812,312
                                                                                   -----------
      Finance-Diversified (3.6%)
   500,000   Guangdong Enterprises-144A Issue (b) (c).........   8.875%  05/22/07      451,080
   525,000   National Collegiate..............................   7.240%  09/20/14      527,625
                                                                                   -----------
                                                                                       978,705
                                                                                   -----------
      Insurance (3.0%)
   800,000   Provident Companies, Inc.........................   7.250%  03/15/28      801,808
                                                                                   -----------
      Investment Bankers/Brokers (7.1%)
 1,000,000   Lehman Brothers, Inc.............................   6.625%  02/15/08      995,520
   900,000   Morgan Stanley Dean Witter.......................   6.875%  03/01/07      923,167
                                                                                   -----------
                                                                                     1,918,687
                                                                                   -----------
      Real Estate Investment Trust (5.1%)
   850,000   Bradley Operating LP.............................   7.000%  11/15/04      855,303
   500,000   Security Capital Pacific Trust...................   7.500%  02/15/14      517,847
                                                                                   -----------
                                                                                     1,373,150
                                                                                   -----------
</TABLE>
 
              See accompanying notes to investments in securities.
 
                                       8
<PAGE>
                                                              ADVANTUS BOND FUND
                                            INVESTMENTS IN SECURITIES--CONTINUED
 
<TABLE>
<CAPTION>
                                                                                     MARKET
PRINCIPAL                                                                           VALUE(a)
- ----------                                                                         -----------
  CORPORATE OBLIGATIONS--CONTINUED
<C>          <S>                                                <C>      <C>       <C>
    UTILITIES (2.7%)
      Electric Companies (2.7%)
$  750,000   Enersis S.A. (b).................................   6.900%  12/01/06  $   735,773
                                                                                   -----------
             Total corporate obligations (cost: $16,530,436).....................   16,772,706
                                                                                   -----------
             Total long-term debt securities (cost: $23,331,942).................   23,672,821
                                                                                   -----------
</TABLE>
 
<TABLE>
<CAPTION>
  SHARES
- ----------
<C>          <S>                                                <C>
PREFERRED STOCK (8.0%)
  FINANCIAL (8.0%)
    Real Estate Investment Trust (8.0%)
    16,000   Duke Realty Investments, Inc.--7.99%.............      836,000
     8,000   Nationwide Health Property, Inc.--7.68%..........      809,000
    10,000   Security Capital Industrial, Series C--8.54%.....      532,810
                                                                -----------
             Total preferred stock (cost: $2,091,552).........    2,177,810
                                                                -----------
</TABLE>
 
<TABLE>
<CAPTION>
PRINCIPAL
- ----------
<C>          <S>                                                <C>      <C>       <C>
SHORT-TERM SECURITIES (2.6%)
$  465,000   US Treasury Bill.................................   5.125%  05/21/98      461,751
   235,000   US Treasury Bill.................................   5.168%  06/25/98      232,192
                                                                                   -----------
             Total short-term securities (cost: $693,959)........................      693,943
                                                                                   -----------
             Total investments in securities (cost: $26,117,453) (d).............  $26,544,574
                                                                                   -----------
                                                                                   -----------
</TABLE>
 
Notes to Investments in Securities
- ----------------------------
(a) Securities are valued by procedures described in note 2 to the financial
    statements.
(b) The Fund held 13.2% of the net assets in foreign securities as of March 31,
    1998.
(c) Represents ownership in a restricted security which has not been registered
    with the Security and Exchange Commission under the Securities Act of 1933.
    (See note 6 to the financial statements.) Information concerning the
    restricted securities held at March 31, 1998, which includes acquisition
    date and cost, is as follows:
 
<TABLE>
<CAPTION>
                                         ACQUISITION
SECURITY:                                   DATE          COST
- ---------------------------------------  -----------   -----------
<S>                                      <C>           <C>
St. George Bank 144A Issue.............   06/12/97     $   700,000
CFSB Finance Company 144A Issue........   05/15/96         291,938
Guangdong Enterprises 144A Issue.......   08/06/97         516,090
Time Warner Incorporated 144A Issue....    Various         956,508
                                                       -----------
                                                       $ 2,464,536
                                                       -----------
                                                       -----------
</TABLE>
 
(d) At March 31, 1998 the cost of securities for federal income tax purposes was
    $26,128,705. The aggregate unrealized appreciation and depreciation of
    investments in securities based on this cost were:
 
<TABLE>
<S>                                      <C>
Gross unrealized appreciation..........  $504,090
Gross unrealized depreciation..........   (88,221)
                                         --------
Net unrealized appreciation............  $415,869
                                         --------
                                         --------
</TABLE>
 
                                       9
<PAGE>
ADVANTUS BOND FUND
STATEMENT OF ASSETS AND LIABILITIES
MARCH 31, 1998
(UNAUDITED)
 
<TABLE>
<S>                                      <C>
                       ASSETS
Investments in securities, at market
 value--see accompanying schedule for
 detailed listing
 (identified cost: $26,117,453)........  $26,544,574
Cash in bank on demand deposit.........      167,205
Receivable for Fund shares sold........      126,824
Receivable for investment securities
 sold..................................      793,053
Accrued interest receivable............      321,386
                                         -----------
    Total assets.......................   27,953,042
                                         -----------
                    LIABILITIES
Payable for investment securities
 purchased.............................      723,561
Payable for Fund shares redeemed.......       60,439
Payable to Adviser.....................       71,896
                                         -----------
    Total liabilities..................      855,896
                                         -----------
Net assets applicable to outstanding
 capital stock.........................  $27,097,146
                                         -----------
                                         -----------
Represented by:
  Capital stock--authorized 10 billion
   shares (Class A--2 billion shares,
   Class B--2 billion shares, Class
   C--2 billion shares and 4 billion
   shares unallocated) of $.01 par
   value (note 1)......................  $    25,716
  Additional paid-in capital...........   26,533,343
  Undistributed net investment
   income..............................       14,160
  Accumulated net realized gains from
   investments.........................       96,806
  Unrealized appreciation on
   investments.........................      427,121
                                         -----------
    Total--representing net assets
     applicable to outstanding capital
     stock.............................  $27,097,146
                                         -----------
                                         -----------
Net assets applicable to outstanding
 Class A shares........................  $18,355,156
                                         -----------
                                         -----------
Net assets applicable to outstanding
 Class B shares........................  $ 7,462,727
                                         -----------
                                         -----------
Net assets applicable to outstanding
 Class C shares........................  $ 1,279,263
                                         -----------
                                         -----------
Shares outstanding and net asset value
 per share:
  Class A--Shares outstanding
   1,741,661...........................  $     10.54
                                         -----------
                                         -----------
  Class B--Shares outstanding
   708,387.............................  $     10.53
                                         -----------
                                         -----------
  Class C--Shares outstanding
   121,518.............................  $     10.53
                                         -----------
                                         -----------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       10
<PAGE>
                                                              ADVANTUS BOND FUND
                                                         STATEMENT OF OPERATIONS
                                   FOR THE SIX MONTH PERIOD ENDED MARCH 31, 1998
                                                                     (UNAUDITED)
 
<TABLE>
<S>                                      <C>
Investment income:
  Interest.............................  $811,226
  Dividends............................    84,359
                                         --------
      Total investment income..........   895,585
                                         --------
Expenses (note 4):
  Investment advisory fee..............    89,441
  Distribution fees--Class A...........    26,598
  Distribution fees--Class B...........    33,575
  Distribution fees--Class C...........     5,538
  Administrative service fee...........    21,800
  Custodian fees.......................     4,800
  Auditing and accounting services.....     6,145
  Legal fees...........................     3,108
  Registration fees....................    16,667
  Printing and shareholder reports.....    19,734
  Insurance............................     2,447
  Other................................     3,442
                                         --------
      Total expenses...................   233,295
  Less fees and expenses waived or
   absorbed by Adviser:
    Class A distribution fees..........   (13,175)
    Other fund expenses................   (52,587)
                                         --------
      Total fees and expenses waived or
      absorbed.........................   (65,762)
                                         --------
      Total net expenses...............   167,533
                                         --------
      Investment income--net...........   728,052
                                         --------
Realized and unrealized gains (losses)
 on investments:
  Net realized gains on investments
   (note 3)............................   275,463
  Net change in unrealized appreciation
   or depreciation on investments......   (17,539)
                                         --------
      Net gains on investments.........   257,924
                                         --------
Net increase in net assets resulting
 from operations.......................  $985,976
                                         --------
                                         --------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       11
<PAGE>
ADVANTUS BOND FUND
STATEMENT OF CHANGES IN NET ASSETS
FOR THE SIX MONTH PERIOD ENDED MARCH 31, 1998 AND YEAR ENDED SEPTEMBER 30, 1997
(UNAUDITED)
 
<TABLE>
<CAPTION>
                                            1998         1997
                                         -----------  -----------
<S>                                      <C>          <C>
Operations:
  Investment income--net...............  $   728,052  $ 1,314,895
  Net realized gain on investments.....      275,463      239,770
  Net change in unrealized appreciation
   or depreciation on investments......      (17,539)     630,935
                                         -----------  -----------
      Increase in net assets resulting
       from operations.................      985,976    2,185,600
                                         -----------  -----------
Distributions to shareholders from net
 investment income:
    Class A............................     (528,922)  (1,017,311)
    Class B............................     (172,364)    (251,336)
    Class C............................      (28,407)     (43,228)
                                         -----------  -----------
      Total distributions..............     (729,693)  (1,311,875)
                                         -----------  -----------
Capital share transactions (notes 4 and
 6):
  Proceeds from sales:
    Class A............................    2,870,262    3,674,438
    Class B............................    2,075,613    3,408,787
    Class C............................      606,164      541,433
  Proceeds from issuance of shares as a
   result of reinvested dividends:
    Class A............................      358,687      648,833
    Class B............................      151,187      216,906
    Class C............................       27,008       38,398
  Payments for redemption of shares:
    Class A............................   (2,178,894)  (4,367,419)
    Class B............................   (1,091,458)  (1,099,162)
    Class C............................     (261,965)    (375,711)
                                         -----------  -----------
      Increase in net assets from
       capital share transactions......    2,556,604    2,686,503
                                         -----------  -----------
      Total increase in net assets.....    2,812,887    3,560,228
Net assets at beginning of period......   24,284,259   20,724,031
                                         -----------  -----------
Net assets at end of period (including
 undistributed net investment income of
 $14,160 and $15,801, respectively)....  $27,097,146  $24,284,259
                                         -----------  -----------
                                         -----------  -----------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       12
<PAGE>
                                                              ADVANTUS BOND FUND
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                  MARCH 31, 1998
                                                                     (UNAUDITED)
 
(1) ORGANIZATION
    The Advantus Bond Fund, Inc. (the Fund) is registered under the Investment
Company Act of 1940 (as amended) as a diversified, open-end management
investment company. The Fund's investment objective is to seek a high level of
current income consistent with prudent investment risk.
 
    The Fund currently issues three classes of shares: Class A, Class B and
Class C shares. Class A shares are sold subject to a front-end sales charge.
Class B shares are sold subject to a contingent deferred sales charge payable
upon redemption if redeemed within six years of purchase. Class C shares are
sold without either a front-end sales charge or a contingent deferred sales
charge. Both Class B and Class C are subject to a higher Rule 12b-1 fee than
Class A shares. Both Class B and Class C shares automatically convert to Class A
shares at net asset value after a specified holding period. Such holding periods
decline as the amount of the purchase increases and range from 28 to 84 months
after purchase for Class B shares and 40 to 96 months after purchase for Class C
shares. All three classes of shares have identical voting, dividend, liquidation
and other rights and the same terms and conditions, except that the level of
distribution fees charged differs between Class A, Class B and Class C shares.
Income, expenses (other than distribution fees) and realized and unrealized
gains or losses are allocated to each class of shares based upon its relative
net assets.
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    The significant accounting policies followed by the Fund are summarized as
follows:
 
  USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of increases and decreases in net assets
resulting from operations during the period. Actual results could differ from
those estimates.
 
  INVESTMENTS IN SECURITIES
 
    Investments in securities traded on a national exchange are valued at the
last sales price on that exchange prior to the time when assets are valued;
securities traded in the over-the-counter market and listed securities for which
no sale was reported on that date are valued on the basis of the last current
bid price, by an independent pricing service or at a price deemed best to
reflect fair value as quoted by dealers who make markets in these securities.
When market quotations are not readily available, securities are valued at fair
value as determined in good faith under procedures adopted by the Board of
Directors. Short-term securities are valued at market.
 
    Security transactions are accounted for on the date the securities are
purchased or sold. Realized gains and losses are calculated on the
identified-cost basis. Interest income, including amortization of bond premium
and discount computed on a level yield basis, is accrued daily.
 
                                       13
<PAGE>
ADVANTUS BOND FUND
NOTES TO FINANCIAL STATEMENTS--CONTINUED
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)
  FEDERAL TAXES
 
    The Fund's policy is to comply with the requirements of the Internal Revenue
Code applicable to regulated investment companies and to distribute all of its
taxable income to shareholders. Therefore, no income tax provision is required.
The Fund's policy is to make required minimum distributions prior to December
31, in order to avoid federal excise tax.
 
    For federal income tax purposes, the Fund had a capital loss carryover at
March 31, 1998 of $178,657, which, if not offset by subsequent capital gains,
will expire September 30, 2003. It is unlikely the Board of Directors will
authorize a distribution of any net realized capital gains until the available
capital loss carryover has been offset or expired.
 
    Net investment income and net realized gains (losses) may differ for
financial statement and tax purposes primarily because of temporary book-to-tax
differences. The character of distributions made during the year from net
investment income or net realized gains may differ from their ultimate
characterization for federal income tax purposes. Also, due to the timing of
dividend distributions, the fiscal year in which amounts are distributed may
differ from the year that the income or realized gains (losses) were recorded by
the Fund.
 
  DISTRIBUTIONS TO SHAREHOLDERS
 
    Dividends from net investment income are declared daily and paid monthly in
cash or reinvested in additional shares. Realized gains, if any, are paid
annually.
 
(3) INVESTMENT SECURITY TRANSACTIONS
    For the period ended March 31, 1998, purchases of securities and proceeds
from sales, other than temporary investments in short-term securities,
aggregated $26,093,745 and $24,117,261, respectively.
 
(4) EXPENSES AND RELATED PARTY TRANSACTIONS
    The Fund has an investment advisory agreement with Advantus Capital
Management, Inc. (Advantus Capital or the Adviser), a wholly-owned subsidiary of
MIMLIC Asset Management Company (MIMLIC Management). Under the agreement,
Advantus Capital manages the Fund's assets and provides research, statistical
and advisory services and pays related office rental and executive expenses and
salaries. In addition, as part of the advisory fee, Advantus Capital pays the
expenses of the Fund's transfer, dividend disbursing and redemption agent, The
Minnesota Mutual Life Insurance Company (Minnesota Mutual), the parent of MIMLIC
Management. The fee for investment management and advisory services is based on
the average daily net assets of the Fund at the annual rate of .70 percent.
 
    The Fund has adopted separate Plans of Distribution applicable to Class A,
Class B and Class C shares, respectively, relating to the payment of certain
distribution expenses pursuant to Rule 12b-1 under the Investment Company Act of
1940 (as amended). The Fund pays distribution fees to Ascend Financial Services,
Inc. (Ascend), formerly known as MIMLIC Sales Corporation, the underwriter of
the Fund and wholly-owned subsidiary of MIMLIC Management, to be used to pay
certain expenses incurred in the distribution, promotion and servicing of the
Fund's shares. The Class A Plan provides for a fee up to .30 percent of average
daily net assets of Class A shares. The Class B and Class C Plans provide for a
fee up to 1.00 percent of average daily net assets of Class B and Class C
shares, respectively. The Class B and Class C 1.00 percent fees are comprised of
a .75 percent distribution fee and a .25 percent service fee. Ascend is
currently waiving that portion of Class A distribution fees which exceeds, as a
percentage of average daily net
 
                                       14
<PAGE>
                                                              ADVANTUS BOND FUND
                                        NOTES TO FINANCIAL STATEMENTS--CONTINUED
 
(4) EXPENSES AND RELATED PARTY TRANSACTIONS--(CONTINUED)
assets, .25 percent. Prior to January 30, 1998, Ascend waived that portion of
Class A distribution fees which exceeded, as a percentage of average daily net
assets, .10%. Ascend waived Class A distribution fees in the amount of $13,175
for the period ended March 31, 1998.
 
    The Fund also bears certain other operating expenses including outside
directors' fees, custodian fees, registration fees, printing and shareholder
reporting fees, legal, auditing and accounting services fees and other
miscellaneous expenses.
 
    The Fund pays an administrative services fee, equal to $3,700, to Minnesota
Mutual for accounting, auditing, legal and other administrative services which
Minnesota Mutual provides. Prior to February 1, 1998, the administrative
services fee was $3,600.
 
    Advantus Capital directly incurs and pays the above operating expenses and
the Fund in turn reimburses Advantus Capital. During the period ended March 31,
1998, Advantus Capital voluntarily agreed to absorb $52,587 in expenses that
were otherwise payable by the Fund.
 
    Sales charges received by Ascend for distributing the Fund's three classes
of shares amounted to $83,975.
 
    As of March 31, 1998, Minnesota Mutual and subsidiaries and the directors
and officers of the Fund as a whole owned 381,801 Class A shares which
represents 21.9 percent of the total outstanding Class A shares.
 
    Legal fees were paid to a law firm of which the Fund's secretary is a
partner in the amount of $3,108.
 
(5) CAPITAL SHARE TRANSACTIONS
    Transactions in shares for the period from October 1, 1997 to March 31, 1998
and the year ended September 30, 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                        CLASS A                 CLASS B                CLASS C
                                                 ----------------------  ----------------------  --------------------
                                                    1998        1997        1998        1997       1998       1997
                                                 ----------  ----------  ----------  ----------  ---------  ---------
<S>                                              <C>         <C>         <C>         <C>         <C>        <C>
Sold...........................................     272,370     359,147     196,800     335,052     57,522     53,035
Issued for reinvested distributions............      34,015      63,405      14,305      21,179      2,559      3,757
Redeemed.......................................    (206,749)   (428,519)   (103,502)   (107,760)   (24,848)   (36,827)
                                                 ----------  ----------  ----------  ----------  ---------  ---------
                                                     99,636      (5,967)    107,603     248,471     35,233     19,965
                                                 ----------  ----------  ----------  ----------  ---------  ---------
                                                 ----------  ----------  ----------  ----------  ---------  ---------
</TABLE>
 
(6) RESTRICTED SECURITIES
    At March 31, 1998, investments in securities includes issues which generally
cannot be offered for sale to the public without first being registered under
the Securities Act of 1933 (restricted security). In the event the securities
are registered, those carrying registration rights allow for the issuer to bear
all the related costs; for issues without rights, the Fund may incur such costs.
The Fund currently limits investments in securities that are not readily
marketable, including restricted securities, to 10% of net assets at the time of
the purchase. Securities are valued by procedures described in note 2. The
aggregate value of restricted securities held by the Fund at March 31, 1998 was
$2,473,265 which represents 9.1% of net assets.
 
                                       15
<PAGE>
ADVANTUS BOND FUND
NOTES TO FINANCIAL STATEMENTS--CONTINUED
 
(7) FINANCIAL HIGHLIGHTS
    Per share data for a share of capital stock and selected information for
each period are as follows:
 
<TABLE>
<CAPTION>
                                                                  CLASS A
                                ----------------------------------------------------------------------------
                                PERIOD FROM                                      PERIOD FROM
                                 OCTOBER 1,                                      NOVEMBER 1,
                                  1997 TO        YEAR ENDED SEPTEMBER 30,          1993 TO       YEAR ENDED
                                 MARCH 31,    -------------------------------   SEPTEMBER 30,   OCTOBER 31,
                                    1998        1997       1996      1995(A)       1994(B)          1993
                                ------------  ---------  ---------  ---------  ---------------  ------------
<S>                             <C>           <C>        <C>        <C>        <C>              <C>
Net asset value, beginning of
 period.......................   $    10.43   $   10.03  $   10.24  $    9.50     $   11.21      $    10.72
                                ------------  ---------  ---------  ---------       -------     ------------
Income from investment
 operations:
  Net investment income.......          .31         .63        .62        .64           .53             .63
  Net gains or losses on
   securities (both realized
   and unrealized)............          .11         .40       (.22)       .74         (1.24)            .78
                                ------------  ---------  ---------  ---------       -------     ------------
    Total from investment
     operations...............          .42        1.03        .40       1.38          (.71)           1.41
                                ------------  ---------  ---------  ---------       -------     ------------
Less distributions:
  Dividends from net
   investment income..........         (.31)       (.63)      (.61)      (.64)         (.53)           (.63)
  Distributions from capital
   gains......................           --          --         --         --          (.47)           (.29)
                                ------------  ---------  ---------  ---------       -------     ------------
    Total distributions.......         (.31)       (.63)      (.61)      (.64)        (1.00)           (.92)
                                ------------  ---------  ---------  ---------       -------     ------------
Net asset value, end of
 period.......................   $    10.54   $   10.43  $   10.03  $   10.24     $    9.50      $    11.21
                                ------------  ---------  ---------  ---------       -------     ------------
                                ------------  ---------  ---------  ---------       -------     ------------
Total return (d)..............          4.1%       10.6%       4.0%      15.1%         (6.7)%          14.0%
Net assets, end of period (in
 thousands)...................   $   18,355   $  17,122  $  16,528  $  15,315     $  13,879      $   14,494
Ratio of expenses to average
 daily net assets (e).........         1.05%(f)      1.00%      1.00%      1.00%         1.00%(f)        1.00%
Ratio of net investment income
 to average daily net assets
 (e)..........................         5.95%(f)      6.18%      6.08%      6.58%         5.79%(f)        5.78%
Portfolio turnover rate
 (excluding short-term
 securities)..................         97.3%      180.5%     222.6%     270.7%        163.5%          139.5%
</TABLE>
 
- ------------
 
(a) Effective March 1, 1995, the Fund entered into a new investment advisory
    agreement with Advantus Capital Management, Inc. Prior to March 1, 1995, the
    Fund had an investment advisory agreement with MIMLIC Asset Management
    Company.
(b) During 1994, the Fund changed its fiscal year end from October 31 to
    September 30.
(c) Commencement of operations.
(d) Total return figures are based on a share outstanding throughout the period
    and assumes reinvestment of distributions at net asset value. Total return
    figures do not reflect the impact of front-end or contingent deferred sales
    charges. For periods less than one year, total return presented has not been
    annualized.
 
                                       16
<PAGE>
                                                              ADVANTUS BOND FUND
                                        NOTES TO FINANCIAL STATEMENTS--CONTINUED
<TABLE>
<CAPTION>
                                                                                                           CLASS C
                                                             CLASS B                               ------------------------
                                -----------------------------------------------------------------                   YEAR
                                 PERIOD FROM                                        PERIOD FROM     PERIOD FROM     ENDED
                                 OCTOBER 1,                                         AUGUST 19,      OCTOBER 1,    SEPTEMBER
                                   1997 TO         YEAR ENDED SEPTEMBER 30,         1994(C) TO        1997 TO        30
                                  MARCH 31,    ---------------------------------   SEPTEMBER 30,     MARCH 31,    ---------
                                    1998         1997       1996       1995(A)         1994            1998         1997
                                -------------  ---------  ---------  -----------  ---------------  -------------  ---------
<S>                             <C>            <C>        <C>        <C>          <C>              <C>            <C>
Net asset value, beginning of
 period.......................    $   10.43    $   10.02  $   10.23   $    9.50      $    9.68       $   10.42    $   10.02
                                     ------    ---------  ---------  -----------        ------          ------    ---------
Income from investment
 operations:
  Net investment income.......          .27          .54        .53         .55            .06             .27          .54
  Net gains or losses on
   securities (both realized
   and unrealized)............          .10          .41       (.21)        .73           (.18)            .11          .40
                                     ------    ---------  ---------  -----------        ------          ------    ---------
    Total from investment
     operations...............          .37          .95        .32        1.28           (.12)            .38          .94
                                     ------    ---------  ---------  -----------        ------          ------    ---------
Less distributions:
  Dividends from net
   investment income..........         (.27)        (.54)      (.53)       (.55)          (.06)           (.27)        (.54)
  Distributions from capital
   gains......................           --           --         --          --             --              --           --
                                     ------    ---------  ---------  -----------        ------          ------    ---------
    Total distributions.......         (.27)        (.54)      (.53)       (.55)          (.06)           (.27)        (.54)
                                     ------    ---------  ---------  -----------        ------          ------    ---------
Net asset value, end of
 period.......................    $   10.53    $   10.43  $   10.02   $   10.23      $    9.50       $   10.53    $   10.42
                                     ------    ---------  ---------  -----------        ------          ------    ---------
                                     ------    ---------  ---------  -----------        ------          ------    ---------
Total return (d)..............          3.6%         9.7%       3.1%       13.9%          (1.2)%           3.7%         9.6%
Net assets, end of period (in
 thousands)...................    $   7,463    $   6,263  $   3,532   $   1,142      $      51       $   1,279    $     899
Ratio of expenses to average
 daily net assets (e).........         1.90%(f)      1.90%      1.90%       1.90%          .22%(g)        1.90%(f)      1.90%
Ratio of net investment income
 to average daily net assets
 (e)..........................         5.12%(f)      5.32%      5.19%       5.61%          .69%(g)        5.13%(f)      5.30%
Portfolio turnover rate
 (excluding short-term
 securities)..................         97.3%       180.5%     222.6%      270.7%         163.5%           97.3%       180.5%
 
<CAPTION>
 
                                             PERIOD FROM
                                              MARCH 1,
                                             1995(C) TO
                                            SEPTEMBER 30,
                                  1996          1995
                                ---------  ---------------
<S>                             <C>        <C>
Net asset value, beginning of
 period.......................  $   10.23     $    9.67
                                ---------        ------
Income from investment
 operations:
  Net investment income.......        .52           .33
  Net gains or losses on
   securities (both realized
   and unrealized)............       (.21)          .55
                                ---------        ------
    Total from investment
     operations...............        .31           .88
                                ---------        ------
Less distributions:
  Dividends from net
   investment income..........       (.52)         (.32)
  Distributions from capital
   gains......................         --            --
                                ---------        ------
    Total distributions.......       (.52)         (.32)
                                ---------        ------
Net asset value, end of
 period.......................  $   10.02     $   10.23
                                ---------        ------
                                ---------        ------
Total return (d)..............        3.1%          9.3%
Net assets, end of period (in
 thousands)...................  $     665     $     112
Ratio of expenses to average
 daily net assets (e).........       1.90%         1.90%(f)
Ratio of net investment income
 to average daily net assets
 (e)..........................       5.20%         5.54%(f)
Portfolio turnover rate
 (excluding short-term
 securities)..................      222.6%        270.7%
</TABLE>
 
- ------------
 
(e) The Fund's Adviser and Distributor voluntarily absorbed or waived $65,762,
    $129,031, $120,750, $129,155, $107,448 and $86,877 in expenses for the
    period ended March 31, 1998, the years ended September 30, 1997, 1996 and
    1995, the period ended September 30, 1994 and the year ended October 31,
    1993, respectively. If Class A shares had been charged for these expenses,
    the ratio of expenses to average daily net assets would have been 1.61%,
    1.64%, 1.68%, 1.88%, 1.83% and 1.70%, respectively, and the ratio of net
    investment income to average daily net assets would have been 5.39%, 5.54%,
    5.40%, 5.70%, 4.95% and 5.08%, respectively. If Class B shares had been
    charged for these expenses, the ratio of expenses to average daily net
    assets would have been 2.31%, 2.34%, 2.38%, 2.56% and .35%, respectively,
    and the ratio of net investment income to average daily net assets would
    have been 4.71%, 4.88%, 4.71%, 4.95% and .56%, respectively, for the period
    ended March 31, 1998, the years ended September 30, 1997, 1996 and 1995 and
    the period ended September 30, 1994. If Class C shares had been charged for
    these expenses, the ratio of expenses to average daily net assets would have
    been 2.31%, 2.34%, 2.38% and 2.56%, respectively, and the ratio of net
    investment income to average daily net assets would have been 4.72%, 4.86%,
    4.72% and 4.88%, respectively, for the period ended March 31, 1998, the
    years ended September 30, 1997 and 1996 and the period ended September 30,
    1995.
(f) Adjusted to an annual basis.
(g) Ratios presented for the period from August 19, 1994 to September 30, 1994
    are not annualized as they are not indicative of anticipated results.
 
                                       17
<PAGE>
SHAREHOLDER SERVICES
 
    The Advantus Family of Funds offers a variety of services that enhance your
ability to manage your assets. Check each Fund's prospectus for the details of
the services and any limitations that apply to a particular Fund.
 
EXCHANGE PRIVILEGES:  You can move all or part of your investment dollars from
one fund to any other Advantus Fund you own (for identical registrations within
the same class) at any time as your needs change. Exchanges are at the then
current net asset value (exchanges from the Advantus Money Market Fund will
incur the applicable sales charge, if not previously subjected to the charge).
Shareholders may make four exchanges each calendar year without incurring a
transaction charge. Thereafter, there will be a $7.50 transaction charge for
each additional exchange within the calendar year. Systematic Exchange Plans are
exempt from this charge.
 
INCOME DISTRIBUTION FLEXIBILITY:  You can have your fund dividends and other
distributions automatically reinvested with no sales charge, direct them from
one Advantus Fund to any other you own within the Fund family or, if you desire,
we'll pay you in cash.
 
SYSTEMATIC WITHDRAWAL PLAN:  You can set up a plan to receive checks at
specified intervals from your fund account-subject to minimum guidelines.
Depending upon the performance of the underlying investment options, the value
may be worth more or less than the original amount invested when withdrawn.
 
DIRECT DEPOSITS:  At your request we will deposit your dividends or systematic
withdrawals directly into your checking or savings account instead of sending
you a check.
 
TELEPHONE EXCHANGE:  You can move money from one Advantus account to any other
Advantus account you own (with identical registrations within the same class)
just by calling our toll free number. The Telephone Exchange and Telephone
Redemption privilege will automatically be established unless otherwise
indicated on the Account Application. Telephone Exchange and Redemption may be
changed (added/deleted) at any time by submitting a request in writing or by
completing a Service Request Form.
 
SYSTEMATIC EXCHANGE:  You can move a set amount of money monthly from one
Advantus Fund to another Advantus Fund (with identical registrations within the
same class) to diversify your investment portfolio and take advantage of
dollar-cost averaging.
 
AUTOMATIC PAYMENT OF INSURANCE PREMIUMS:  You may automatically pay your
Minnesota Mutual insurance premiums from your Advantus Money Market account.
 
REDUCED SALES CHARGES:  Letter of Intent, combined purchases with spouse,
children or single trust estates, and the Right of Accumulation make it possible
for you to reduce the sales charge on Advantus's non-money market funds.
 
SPECIAL PURCHASE PLANS:  Special purchase plans enable you to open an Advantus
Fund account for as little as $25 and lower your average share cost through
"dollar-cost averaging." (Dollar-cost averaging does not assure a profit, nor
does it prevent loss in declining markets.) The Automatic Investment Plan allows
you to invest automatically each month from your checking or savings account.
 
IRAS, OTHER QUALIFIED PLAN:  You can use the Advantus Family of Funds for your
Traditional or Roth Individual Retirement Account or other qualified plan
including: SEP IRA's, SIMPLE IRA's, profit sharing, money purchase or defined
benefit plans.
 
GROUP INVESTMENT PLAN:  This plan provides employers and employees with a
convenient means for investing in the funds through payroll deduction.
 
                                       18
<PAGE>
TELEPHONE REDEMPTION:  You may call us and redeem shares over the phone. The
proceeds will be sent by check to the address of record for the account or wire
transferred to your bank of record for the account. Wire transfers are for
amounts over $500. The prevailing wire charge will be added to the withdrawal
amount. The Telephone Exchange and Telephone Redemption privilege will
automatically be established unless otherwise indicated on the Account
Application. Telephone Exchange and Redemption may be changed (added/deleted) at
any time by submitting a request in writing or by completing a Service Request
Form. To have the redemption automatically deposited into your checking account,
please send a voided check from your bank. Depending on the performance of the
underlying investment options, the value may be worth more or less than the
original amount invested upon redemption. Some limitations apply, please refer
to the prospectus for details.
 
ACCOUNT UPDATES:  You will receive written confirmation of every investment you
initiate (monthly statements for your Money Market account) and quarterly
statements to help you track all of your Advantus Fund investments and annual
tax statements. Semi-annual and annual reports will provide you with portfolio
information, fund performance data and the current investment outlook.
 
TOLL-FREE SERVICE LINE:  For your convenience in obtaining personal information
and assistance directly from Advantus Shareholder Services, call
(1-800-665-6005). Advantus Account Representatives are available Monday through
Friday from 8 a.m. to 4:45 p.m. Central Time. Our voice response system is
available from 7 a.m. to 3 a.m. Central Time Monday through Friday, and 8 a.m.
to 5 p.m. on Saturday. This system allows you to access current net asset values
and account balances.
 
HOW TO INVEST
 
    You can invest in one or more of the ten Advantus Funds through a local
Registered Representative of Ascend Financial Services, Inc. (formerly known as
MIMLIC Sales Corporation), distributor of the Funds. Contact your representative
for information and a prospectus for any of the Advantus Funds you are
interested in. To find a Registered Representative near you, call the toll-free
service line (1-800-665-6005).
 
MINIMUM INVESTMENTS:  Your initial investment in any of the Advantus Funds can
be as small as $25 when you use the Automatic Investment Plan. Minimum lump-sum
initial investment is $250. Minimum subsequent investment is $25.
 
THE FUND'S MANAGER
 
    Advantus Capital Management, Inc., investment adviser to the Fund, selects
and reviews the Fund's investments and provides executive and other personnel
for the Fund's management.
 
    Advantus Capital Management, Inc. manages twelve mutual funds containing
$2.7 billion in assets in addition to $2.1 billion in assets for other clients.
Advantus Capital's seasoned portfolio managers average more than 11 years of
investment experience.
 
ADVANTUS FAMILY OF FUNDS
 
Advantus Bond Fund
Advantus Horizon Fund
Advantus Spectrum Fund
Advantus Enterprise Fund
Advantus Cornerstone Fund
Advantus Money Market Fund
Advantus Mortgage Securities Fund
Advantus International Balanced Fund
Advantus Venture Fund
Advantus Index 500 Fund
 
                                       19
<PAGE>
     THIS REPORT HAS BEEN PREPARED FOR SHAREHOLDERS AND MAY BE DISTRIBUTED
       TO OTHERS ONLY IF PRECEDED OR ACCOMPANIED BY A CURRENT PROSPECTUS.
                READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST.
 
                        [ADVANTUS -TM- FAMILY OF FUNDS]
                        ASCEND FINANCIAL SERVICES, INC.,
                      SECURITIES DEALER, MEMBER NASD/SIPC
                            400 ROBERT STREET NORTH
                            ST. PAUL, MN 55101-2098
                                 1-800-AFS-1838
                                (1-800-237-1838)
<PAGE>
 
ASCEND FINANCIAL SERVICES, INC.                         BULK RATE
400 ROBERT STREET NORTH                             U.S. POSTAGE PAID
ST. PAUL, MN 55101-2098                                ST. PAUL, MN
                                                     PERMIT NO. 3547
 
ADDRESS SERVICE REQUESTED
 
F.48644 Rev. 5-1998


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