FORTIS SERIES FUND INC
497, 1998-05-04
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<S>                <C>                                      <C>
    [LOGO]
 
                                                            PROSPECTUS DATED
                   FORTIS SERIES FUND, INC.                 May 1, 1998
                   (A series fund with three available      STREET ADDRESS:
MAILING ADDRESS:   series,                                  500 BIELENBERG
P.O. BOX 64582     each with different goals and            DRIVE
ST. PAUL           investment policies)                     WOODBURY
MINNESOTA 55164                                             MINNESOTA 55125
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Fortis Series Fund, Inc. ("Fortis Series") is an open-end management investment
company (commonly known as a "mutual fund") that is intended to provide a range
of investment alternatives through its eighteen separate series (the "Series"),
each of which is, for investment purposes, a separate fund with its own goals
and investment policies. Each available Series is diversified.
 
Shares are currently sold to separate accounts (the "Separate Accounts") of
Fortis Benefits Insurance Company ("Fortis Benefits") and First Fortis Life
Insurance Company ("First Fortis"), which are the funding vehicles for benefits
under variable life insurance policies (the "Policies") and variable annuity
contracts (the "Annuities") (collectively, the "Contracts") issued by Fortis
Benefits and First Fortis. The Separate Accounts invest in shares of Fortis
Series through subaccounts that correspond to the different Series. The Separate
Accounts will redeem shares of Fortis Series to the extent necessary to provide
benefits under the Contracts or for such other purposes as may be consistent
with the Contracts.
 
The investment objectives of each Series are nonfundamental and may be changed
at any time without the approval of Contract owners. The investment objectives
are:
 
- - The objectives of the "Money Market Series" are high levels of capital
  stability and liquidity and, to the extent consistent with these primary
  objectives, a high level of current income. Money Market Series will invest in
  a diversified portfolio of commercial paper and other debt securities. AN
  INVESTMENT IN MONEY MARKET SERIES IS NEITHER INSURED NOR GUARANTEED BY THE
  U.S. GOVERNMENT.
 
- - The primary objective of the "Global Growth Series" is long-term capital
  appreciation which it seeks primarily by investing in a global portfolio of
  equity securities, allocated among diverse international markets. Current
  income through the receipt of income such as interest or dividends from
  investments is a secondary objective.
 
- - The primary objective of the "Growth Stock Series" is short and long-term
  capital appreciation. Current income through the receipt of interest and
  dividends will merely be incidental to the efforts of Growth Stock Series in
  pursuing its primary objective. Growth Stock Series will seek to meet these
  objectives by investing primarily in common stocks and securities convertible
  into common stocks.
 
This Prospectus concisely sets forth the information a prospective investor
should know about Fortis Series before investing. Investors should retain this
Prospectus for future reference. Fortis Series has filed a Statement of
Additional Information dated May 1, 1998 with the Securities and Exchange
Commission (the "Commission"). The Statement of Additional Information is
available free of charge from Fortis Series at the above mailing address, and is
incorporated by reference into this Prospectus in accordance with the
Commission's rules. The Commission maintains a World Wide Web site that contains
reports and information regarding issuers that file electronically with the
Commission. The address of such site is "http://www.sec.gov." SHARES IN FORTIS
SERIES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED BY, ANY
BANK; ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION,
THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY; AND INVOLVE INVESTMENT RISKS,
INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
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.
 
No broker-dealer, sales representative, or other person has been authorized to
give any information or to make any representations other than those contained
in this Prospectus, and if given or made, such information or representations
must not be relied upon as having been authorized by Fortis Benefits, First
Fortis, Fortis Series, or Fortis Investors, Inc. ("Investors"). This Prospectus
does not constitute an offer or solicitation by anyone in any state in which
such offer or solicitation is not authorized, or in which the person making such
offer or solicitation is not qualified to do so, or to any person to whom it is
unlawful to make such offer or solicitation.
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TABLE OF CONTENTS
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<S>                                                 <C>
Financial Highlights..............................          2
Performance Information...........................          3
Organization and Classification...................          3
Investment Objectives and Policies; Risk
 Considerations...................................          3
    - Money Market Series.........................          4
    - Global Growth Series........................          5
    - Growth Stock Series.........................          8
    - Investment Policies, Restrictions and Risks
        Applicable to More Than One Series........          8
    - General Risks to Consider...................         10
Management........................................         11
    - Board of Directors..........................         11
    - The Investment Adviser/Transfer
      Agent/Dividend Agent........................         11
    - The Underwriter.............................         11
    - Expenses....................................         11
 
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<S>                                                 <C>
    - Brokerage Allocation........................         11
    - Periodic Reports............................         11
The Separate Accounts and the Contracts...........         11
General Information...............................         12
    - Voting Privileges...........................         12
    - Year 2000...................................         12
Dividends and Capital Gains Distributions.........         12
Taxation..........................................         12
Purchase and Redemption of Shares.................         12
    - Generally...................................         12
    - Offering Price..............................         12
    - Transfers Among Subaccounts.................         13
    - Redemption..................................         13
Appendix..........................................         13
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FINANCIAL HIGHLIGHTS
(For a share outstanding throughout the period)
The following audited financial highlights should be read in conjunction with
the financial statements of the applicable series and the independent auditors'
report of KMPG Peat Marwick LLP found in Fortis Series' 1997 Annual Report to
Shareholders which may be obtained without charge. The selected per share
historical data for each of the Series is presented based upon average shares
outstanding. Total return figures do not reflect charges pursuant to the terms
of the variable life insurance policies and variable annuity contracts funded by
separate accounts that invest in the Series' shares.
 
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<S>                  <C>       <C>       <C>         <C>         <C>         <C>         <C>         <C>       <C>       <C>
                                                               YEAR ENDED DECEMBER 31,
MONEY MARKET SERIES    1997      1996       1995        1994        1993        1992        1991       1990      1989     1988
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Net asset value,
 beginning of
 period.............  $10.94    $10.83    $10.63      $10.23      $10.21      $10.15      $10.19       $9.92     $9.65    $9.98
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Operations:
  Investment income
   -- net...........     .58       .57       .60         .41         .28         .36         .62         .78       .77      .76
  Net realized and
   unrealized gains
   (losses) on
   investments......      --        --        --        (.01)        .02         .06        (.02)        .28       .27     (.29)
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Total from
 operations.........     .58       .57       .60         .40         .30         .42         .60        1.06      1.04      .47
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Distribution to
 shareholders:
  From investment
   income -- net....   (.49)      (.46)     (.40)         --        (.28)       (.36)       (.64)       (.79)     (.77)    (.80)
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Net asset value, end
 of period..........  $11.03    $10.94    $10.83      $10.63      $10.23      $10.21      $10.15      $10.19     $9.92    $9.65
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Total return(@).....    5.34%     5.17%     5.71%       3.92%       2.77%       3.36%       5.91%       7.87%     9.42%    6.78%
Net assets end of
 period (000s
 omitted)........... $57,009   $61,906   $41,807     $44,833     $28,682     $27,528     $10,737      $8,897    $2,868   $1,939
Ratio of expenses to
 average daily net
 assets.............     .38%      .38%      .40%        .40%        .44%        .46%        .55%        .60%      .60%     .60%
Ratio of net
 investment income
 to average daily
 net assets.........    5.19%     5.14%     5.44%       3.96%       2.74%       3.51%       5.74%       7.75%     8.03%    7.71%
Portfolio turnover
 rate...............     N/A*      N/A*      N/A*        N/A*        N/A*        N/A*        N/A*         58%       19%      79%
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*Pursuant to Rule 2a-7 under the Investment Company Act of 1940, under which the
 Money Market Series began to operate on May 1, 1991, the portfolio turnover
 rate is not applicable.
 
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                                                                                     YEAR ENDED DECEMBER 31,
                                                              ---------------------------------------------------------------------
GLOBAL GROWTH SERIES                                            1997        1996        1995        1994        1993       1992*
<S>                                                           <C>         <C>         <C>         <C>         <C>        <C>
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Net asset value, beginning of period........................    $19.00      $15.97      $12.31      $12.77     $10.86      $9.82
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Operations:
  Investment income -- net..................................       .02         .03         .09         .10        .06        .05
  Net realized and unrealized gains (losses) on
   investments..............................................      1.27        3.03        3.66        (.46)      1.91       1.04
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    Total from operations...................................      1.29        3.06        3.75        (.36)      1.97       1.09
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Distribution to shareholders:
  From investment income -- net.............................        --        (.03)       (.09)       (.10)      (.06)      (.05)
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Net asset value, end of period..............................    $20.29      $19.00      $15.97      $12.31     $12.77     $10.86
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Total return(@).............................................      6.82%      19.10%      30.49%      (2.98)%    17.92%     10.88%
Net assets end of period (000s omitted).....................  $353,255    $319,831    $207,913    $144,647    $75,882    $11,091
Ratio of expenses to average daily net assets...............       .79%        .79%        .80%        .81%      1.02%      1.22%**
Ratio of net investment income to average daily net
 assets.....................................................       .12%        .15%        .64%        .82%       .53%       .73%**
Portfolio turnover rate.....................................        35%         14%         29%         20%        19%        21%
Average Commission Rate Paid***.............................  $  .0260    $  .0295          --          --         --         --
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</TABLE>
 
  *For the Period May 1, 1992 (commencement of operations) to December 31, 1992.
   The Series' inception was April 13, 1992, when it was initially capitalized.
   However, the Series' shares did not become effectively registered under the
   Securities Act of 1933 until May 1, 1992. Information is not presented for
   the period from April 13, 1992, through May 1, 1992, as the Series' shares
   were not registered during that period.
 
- --------------------------
 **Annualized.
 
***In accordance with rules adopted by the Securities and Exchange Commission,
   disclosure of average commission rate paid is required beginning with fiscal
   year 1996. The amount represents total brokerage commission paid on
   applicable purchases and sales of securities for the period, divided by the
   total number of related shares purchased and sold.
 
 @These are the Series total returns during the period, including reinvestment
  of all dividend and capital gains distributions.
 
                                       2
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                                                                 YEAR ENDED DECEMBER 31,
GROWTH STOCK SERIES     1997        1996        1995        1994        1993        1992        1991      1990      1989      1988
<S>                   <C>         <C>         <C>         <C>         <C>         <C>         <C>        <C>       <C>       <C>
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Net asset value,
 beginning of
 period.............    $32.59      $28.09      $22.11      $22.92      $21.15      $20.68     $13.57    $14.26    $10.59    $10.42
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Operations:
  Investment income
   -- net...........       .12         .12         .13         .18         .09         .18        .22       .38       .26       .29
  Net realized and
   unrealized gains
   (losses) on
   investments......      3.93        4.50        5.98        (.81)       1.77         .47       7.11      (.69)     3.67       .16
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Total from
 operations.........      4.05        4.62        6.11        (.63)       1.86         .65       7.33      (.31)     3.93       .45
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Distribution to
 shareholders:
  From investment
   income -- net....        --        (.12)       (.13)       (.18)       (.09)       (.18)      (.22)     (.38)     (.26)     (.28)
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Net asset value, end
 of period..........    $36.64      $32.59      $28.09      $22.11      $22.92      $21.15     $20.68    $13.57    $14.26    $10.59
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Total return(@).....     12.42%      16.41%      27.66%      (2.82%)      8.78%       2.94%     53.50%    (3.10)%   36.46%     4.49%
Net assets end of
 period (000s
 omitted)...........  $707,155    $661,217    $530,945    $377,483    $304,293    $188,172    $100,690   $25,623   $8,632    $3,023
Ratio of expenses to
 average daily net
 assets.............       .66%        .67%        .67%        .68%        .69%        .76%       .81%     1.01%     1.00%     1.00%
Ratio of net
 investment income
 to average daily
 net assets.........       .33%        .39%        .51%        .81%        .46%        .92%      1.28%     2.72%     2.03%     2.76%
Portfolio turnover
 rate...............       .19%         30%         20%         19%         26%         24%        31%       50%       40%       85%
Average Commission
 Rate Paid***.......  $  .0659    $  .0728          --          --          --          --         --        --        --        --
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</TABLE>
 
- --------------------------
***In accordance with rules adopted by the Securities and Exchange Commission,
   disclosure of average commission rate paid is required beginning with fiscal
   year 1996. The amount represents total brokerage commission paid on
   applicable purchases and sales of securities for the period, divided by the
   total number of related shares purchased and sold.
 @These are the Series total returns during the period, including reinvestment
  of all dividend and capital gains distributions.
 
PERFORMANCE INFORMATION
 
The Series may advertise their "cumulative total return" and "average annual
total return" and may compare such figures to recognized indices. Some Series
may advertise their "yield" and Money Market Series may advertise its "yield"
and "effective yield." Any advertisement of a Series' performance will be
accompanied by performance of the Separate Account being advertised. (See "The
Separate Accounts and the Contracts.") All yield and total return quotations are
based upon historical earnings and are not intended to indicate future
performance. The return on and principal value of an investment in a Series will
fluctuate, so that when redeemed the investment may be worth more or less than
its original cost.
 
Yield calculations will be based upon a 30-day period stated in the
advertisement and will be calculated by dividing the net investment income per
share (as defined under Securities and Exchange Commission rules and
regulations) earned during the advertised period by the offering price per share
on the last day of the period. The result will then be "annualized" using a
formula that provides for semi-annual compounding of income.
 
Average annual total return is the average annual compounded rate of return on a
hypothetical $1,000 investment made at the beginning of the advertised period.
Cumulative total return is calculated by subtracting a hypothetical $1,000
payment from the redeemable value of such payment at the end of the advertised
period, dividing such difference by $1,000 and multiplying the quotient by 100.
In calculating average annual and cumulative total return, all dividends and
distributions are assumed to be reinvested.
 
Comparative performance information also may be used from time to time in
advertising. Advertisements may compare the Series' performance to that of
various unmanaged market indices, or may include performance data compiled by
outside organizations such as Lipper Analytical Services, Inc.,
CDA/Wiesenberger, other entities or organizations or publications which track
the performance of investment companies.
 
For additional information regarding comparative performance information and the
calculation of yield, average annual total return and cumulative total return,
see "Performance" in the Statement of Additional Information.
 
ORGANIZATION AND CLASSIFICATION
 
Fortis Series was incorporated under Minnesota law in 1986, and is registered
with the Securities and Exchange Commission under the Investment Company Act of
1940 (the "1940 Act") as an "open-end management investment company." Each
available Series is classified as a diversified investment company under the
1940 Act. Each Series is, for investment purposes, in effect a separate
investment fund. A separate series of capital stock is issued for each Series.
Each share of capital stock issued with respect to a Series has a pro-rata
interest in the assets of that Series and has no interest in the assets of any
other Series. Each Series bears its own liabilities and also its proportionate
share of the general liabilities of Fortis Series. In other respects, Fortis
Series is treated as one entity.
 
INVESTMENT OBJECTIVES AND POLICIES; RISK CONSIDERATIONS
 
Each Series has different investment objectives which it pursues through
different investment policies as described below. The investment objectives of
the Series and, except as otherwise noted, the policies by which the Series seek
to achieve their investment objectives, may be changed without the approval of
shareholders. While no such change is contemplated, such a change could result
in a Series' objectives differing from those deemed appropriate by an investor
at the time of investment.
 
Through careful selection, broad diversification and constant supervision,
Fortis Series' management aims to limit and counteract various types of risk
that are inherent in all securities and advance the value of the Series' assets.
There is risk in all investments and fulfillment of the Series' objectives
cannot be assured. These risks are discussed below under sections describing
each Series, as well as under the section "General Risks to Consider." In
addition, no Series is intended to be a complete investment program, therefore
it may serve to diversify an investor's portfolio.
 
Fortis Advisers, Inc. ("Advisers") is the investment adviser for each Series. In
selecting equity securities for the Growth Stock Series, Advisers uses a
"growth" philosophy. Under this philosophy, Advisers uses a "bottom up"
investment style in which stock selection is driven primarily by the merits of
the company itself.
 
In managing "growth" portfolios, Advisers invests based on a concept of growth
potential, seeking to identify companies whose earnings and revenue growth
potential exceed industry averages. In addition to superior earnings growth
potential, Advisers seeks companies which it believes to be well managed with
above average returns on equity and invested capital, healthy balance sheets and
the potential to gain market share. Companies of this nature typically have
above average growth potential and a correspondingly higher than average
valuation level as measured by price to earnings, price to cash flow and price
to book value ratios.
 
                                       3
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Any investment restriction or limitation which involves a maximum percentage of
securities or assets, except a Series' borrowing policy and policy with respect
to investing in illiquid securities, shall not be considered to be exceeded
unless an excess over the percentage occurs immediately after an acquisition of
securities or utilization of assets and such excess results therefrom.
 
After purchase by any Series, a security may cease to be rated or its rating may
be reduced below the minimum required for purchase by such Series. Neither event
will require a sale of such security by a Series. To the extent the ratings may
change as a result of changes in the rating organizations or the rating systems,
each Series will attempt to use comparable ratings as standards for investments
in accordance with the investment policies contained in this Prospectus and in
the Statement of Additional Information. The ratings of Standard & Poor's
Ratings Services and Moody's Investors Service, Inc. are described in the
Appendix attached hereto.
 
The insurance laws and regulations of various states as well as the Internal
Revenue Code of 1986 and regulations thereunder may from time to time, impose
additional restrictions on the investments of the various Series.
 
MONEY MARKET SERIES
 
The objectives of Money Market Series are high levels of capital stability and
liquidity and, to the extent consistent with these primary objectives, a high
level of current income. Money Market Series intends to achieve these objectives
through investment in a diversified portfolio of commercial paper and other debt
securities.
 
Money Market Series is somewhat different from a traditional money market mutual
fund in that it does not attempt to maintain its net asset value at any set
price. It has a nonfundamental investment policy requiring that all of its
assets be invested in debt securities maturing in 13 months or less, except
United States Government Securities as defined in the 1940 Act, whose portfolio
maturities cannot be more than 25 months from the date of acquisition. Money
Market Series will maintain a dollar weighted average portfolio maturity of 90
days or less.
 
Pursuant to Rule 2a-7 under the 1940 Act, Money Market Series will not invest
more than 5% of its total assets in: (1) securities of any one issuer (other
than cash or United States Government Securities as defined in the 1940 Act),
except that the Series may at any one time make a single investment of more than
5% of its assets in securities of an issuer in the highest rating category for
up to three business days (subject to the diversification requirements of the
1940 Act, as set forth under "Investment Policies, Restrictions, and Risks
Applicable to More Than One Series"); or (2) securities rated in the second
highest rating category-- with investments in the second highest category
further limited with respect to any particular issuer to the greater of 1% of
total assets or $1,000,000. Certain of the provisions of Rule 2a-7 are more
restrictive than Money Market Series' investment policies and restrictions
described below; Money Market Series' investments will be limited to the more
restrictive provisions of Rule 2a-7.
 
Money Market Series pursues its objectives by investing exclusively in the
following:
 
    1.  Obligations of domestic issuers (which include, for example, commercial
paper and other debt obligations) which meet the quality and other standards of
Rule 2a-7 (or successors thereto) under the 1940 Act.
 
    2.  Securities of, or guaranteed by, the United States Government, its
agencies or instrumentalities. For a discussion of this type of security and the
federal income tax diversification requirements applicable to investments in
this type of security, see "Investment Policies, Restrictions, and Risks
Applicable to More Than One Series--U.S. Government Securities" below.
 
    3.  Securities (payable in U.S. dollars) of, or guaranteed by, the
government of Canada or a province of Canada or any instrumentality or political
subdivision thereof, such securities not to exceed 25% of Money Market Series'
total assets, and securities of foreign companies (which do not include domestic
branches of foreign banks and foreign branches of domestic banks), such
securities not to exceed 15% of Money Market Series' total assets. See "Global
Growth Series--Risk Factors" for a discussion of certain risks connected with
investing in foreign securities.
 
    4.  Obligations of: (a) domestic or foreign banks having total assets in
excess of one billion dollars or of any branches of such banks, whether domestic
or foreign; or (b) in other foreign issuers; provided, that no more than 49% of
Money Market Series' total assets may be so invested in all such securities.
Such obligations of domestic and foreign banks may include, but are not limited
to, certificates of deposit, letters of credit, and bankers' acceptances. For
this purpose, "bank" includes commercial banks, savings banks and savings and
loan associations. Overall, with respect to investments set forth in this
paragraph and in paragraph 3, above, Money Market Series may not invest more
than 49% of the value of its total assets collectively in: (i) securities of, or
guaranteed by, the government of Canada, a province of Canada, or any
instrumentality or political subdivision thereof; (ii) securities of foreign
companies; and (iii) securities of domestic branches of foreign banks and
foreign branches of domestic banks.
 
There are risks associated with investments in obligations of foreign branches
of domestic banks and domestic branches of foreign banks that do not accompany
investments in obligations of domestic banks generally. Domestic banks are
required to maintain specified levels of reserves, are limited in the amounts
they can loan to a single borrower, and are subject to other regulations
designed to promote financial soundness. Not all of such laws and regulations
apply to foreign branches of domestic banks. Money Market Series may also be
subject to additional investment risks from investing in the obligations of
foreign branches of domestic banks. Such risks include future political and
economic developments, the possible imposition of foreign withholding taxes on
interest income payable on securities, the possible seizure or nationalization
of foreign deposits, the possible establishment of exchange controls, or the
adoption of other foreign governmental restrictions which might adversely affect
the payment of principal and interest on such obligations. The obligations of
domestic branches of foreign banks may also be subject to other risks, including
political and economic developments in the country in which the foreign bank has
its main office. There may be less publicly available information about a
domestic branch of a foreign bank than about a domestic bank. In addition,
obligations of foreign branches of domestic banks and domestic branches of
foreign banks are not insured by the Federal Deposit Insurance Corporation.
 
    5.  Extendible notes that provide for an optional maturity date, at Money
Market Series' option, of 13 months or less from the date of acquisition.
Extendible notes issued with maturity dates in excess of 13 months from the date
of issuance that provide for optional maturity dates, at the holder's option, of
13 months or less shall be deemed by Money Market Series to have been issued
with the shorter optional maturity dates. Such extendible notes must meet the
quality and other standards of Rule 2a-7 (or successors thereto) and may not
account for greater than 25% of the total assets of Money Market Series.
 
    6.  Repurchase agreements in connection with obligations which are suitable
for investment under the categories set forth above.
 
    7.  Obligations other than those listed above if the obligation is
accompanied by a guarantee of principal and interest, provided that the
guarantee is that of a bank or corporation whose certificates of deposit or
commercial paper may otherwise be purchased by Money Market Series.
 
SHORT-TERM TRADING. Money Market Series intends to use short-term trading of its
securities as a means of managing its portfolio to achieve its investment
objectives. As used herein, "short-term trading" means selling
 
                                       4
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securities held for a relatively brief period of time, usually less than three
months. Short-term trading will be used by Money Market Series primarily in two
situations:
 
    (a) MARKET DEVELOPMENTS. A security may be sold to avoid depreciation in
    what Advisers anticipates will be a market decline (a rise in interest
    rates), or a security may be purchased in anticipation of a market rise (a
    decline in interest rates) and later sold; and
 
    (b) YIELD DISPARITIES. A security may be sold and another security of
    comparable quality purchased at approximately the same time, in order to
    take advantage of what Advisers believes is a temporary disparity in the
    normal yield relationship between the two securities (a yield disparity).
 
Short-term trading techniques will be used principally in connection with higher
quality, nonconvertible debt securities, which are often better suited for
short-term trading because the market in such securities is generally of greater
depth and offers greater liquidity than the market in debt securities of lower
quality.
 
Money Market Series will engage in short-term trading if it believes the
transactions, net of costs (including commission, if any), will result in
improving the appreciation potential or income of its investment portfolio.
Whether any improvement will be realized by short-term trading will depend upon
the ability of Advisers to evaluate particular securities and anticipate
relevant market factors, including interest rate trends and variations from such
trends. Short-term trading such as that contemplated by the Series places a
premium upon the ability of Advisers to obtain relevant information, to evaluate
it promptly, and to take advantage of its evaluations by completing transactions
on a favorable basis.
 
GLOBAL GROWTH SERIES
 
The primary investment objective of Global Growth Series is long-term capital
appreciation. Current income through the receipt of income such as interest or
dividends from investments is an incidental objective. Global Growth Series
seeks its objectives primarily by investing in a global portfolio of equity
securities, allocated among diverse international markets. The Series is
designed for investors who wish to accept the risks entailed in such
investments, which are different from those associated with a portfolio
consisting entirely of U.S. securities. See "Risk Factors." The Series may
invest in any kind of equity security including common stocks, preferred stocks
and warrants.
 
The Series is not required to maintain any particular geographic or currency mix
of its investments, nor is it required to maintain any particular proportion of
equity securities, bonds, or other securities in its portfolio. However, in view
of its investment objectives, the Series currently expects to invest its assets
primarily in equity securities. Under normal market conditions Global Growth
Series invests approximately 55% to 65% of its total assets in equity securities
in established growth companies which have achieved a record of operating
earnings over the past five-year period. Such companies would usually be located
in the United States, Canada, the United Kingdom, Japan, Australia, and other
Western European nations. These companies will also have paid or have the
ability to pay a dividend. Established growth companies typically have less
sensitivity to general economic trends, tend to generate above average returns
on invested capital, and have leadership positions in their respective
industries. When selecting securities of non-U.S. issuers, Advisers considers
additional factors related to the country of the non-U.S. issuer, including
foreign currency exchange, the political stability of the country of such
non-U.S. issuer, foreign regulations, and settlement practices. See "Risk
Factors."
 
Global Growth Series may invest up to 45% of its equity securities in emerging
growth companies and in global emerging markets. For a discussion of emerging
growth companies and global emerging markets, see "Emerging Markets." Global
Growth Series has no minimum size requirements for the emerging growth companies
in which it will invest. Advisers believes that investments in equity securities
in emerging growth companies and in global emerging markets offer the
opportunity for significant long-term investment returns.
 
Global Growth Series may invest without limit in investment grade fixed income
securities of U.S. and non-U.S. issuers when the total return available from
investments in such securities may equal or exceed the total return available
from investments in equity securities. The Series may invest all of its assets
in high quality debt securities of U.S. and non-U.S. issuers, may hold cash
(U.S. dollars, foreign currencies, or multinational currency units) and/or
invest any portion or all of its assets in high quality money market instruments
as temporary defensive strategies. High quality debt securities are securities
rated within one of the two highest ratings categories of Moody's (Aaa and Aa)
or of S&P (AAA and AA), or comparably rated by another nationally recognized
rating agency, or, if unrated, determined to be of comparable quality by
Advisers.
 
The debt obligations in which the Series may invest include a variety of
government bonds and corporate debt obligations. Global Growth Series expects
that a large portion of its debt investments will be high quality, as defined
above, government or corporate bonds. Government bonds which the Series may
purchase include debt obligations issued or guaranteed by the U.S. government or
foreign governments (including foreign states, provinces, or municipalities) or
their agencies, authorities or instrumentalities and also includes debt
obligations issued by supranational entities, which entities are organized or
supported by several national governments, such as the World Bank and the Asian
Development Bank. Other debt obligations which the Series may purchase include
corporate bonds and debt obligations convertible into equity securities or
having attached warrants or rights to purchase equity securities. The Series may
also purchase securities that are issued by the government or a corporation or
financial institution of one nation but denominated in the currency of another
nation (or a multinational currency unit). No more than 5% of the Series' net
assets may be invested in a debt security rated lower than Baa or BBB. A
description of the Moody's and S&P ratings is included in the Appendix.
 
The Series may also use forward currency contracts and options and futures
strategies which involve certain investment risks and transaction costs.
 
EMERGING MARKETS. Global Growth Series may invest up to 45% of its equity
securities in emerging market countries. Many emerging market countries have
experienced substantial or, in some periods, extremely high rates of inflation
for many years. Inflation and rapid fluctuations in inflation rates have had and
may continue to have adverse effects on the economies and securities markets of
certain of these countries. In an attempt to control inflation, wage and price
controls have been imposed in certain countries. In many cases, emerging market
countries are among the world's largest debtors to commercial banks, foreign
governments, international financial organizations and other financial
institutions. In recent years, the governments of some of these countries have
encountered difficulties in servicing their external debt obligations, which has
led to defaults on certain obligations and the restructuring of certain
indebtedness.
 
As used in this Prospectus, emerging markets are countries categorized as
emerging markets by the International Financial Corporation, the World Bank's
private sector division. Such countries may include but are not limited to
Singapore, Indonesia, China, India and certain Latin American countries such as
Mexico, Argentina, Chile and Brazil. Such markets tend to be in the less
economically developed regions of the world. General characteristics of emerging
market countries also include lower degrees of political stability, a high
demand for capital investment, a high dependence on export markets for their
major industries, a need to develop basic economic infrastructures, and rapid
economic growth.
 
                                       5
<PAGE>
FOREIGN CURRENCY FORWARD EXCHANGE CONTRACTS. Global Growth Series may purchase
or sell foreign currency forward exchange contracts ("forward contracts") to
attempt to minimize the risk from adverse changes in the relationship between
the various currencies in which such Series invests. A forward contract is an
obligation to purchase or sell a specific currency for an agreed price at a
future date. The contract is individually negotiated and privately traded by
currency traders and their customers. The Series may enter into a forward
contract, for example, when it enters into a contract for the purchase or sale
of a security denominated in a foreign currency in order to "lock in" the price
of the security ("transaction hedge") in a particular currency. Additionally,
when the Series believes that a foreign currency (for example, the British
pound) may suffer a decline against any other currency or currencies in the
Series (for example, the U.S. dollar), it may enter into a forward sale contract
to sell an amount of the foreign currency expected to decline (the British
pound) that approximates the value of some or all of the Series' investment
securities denominated in such foreign currency (the British pound) (a "position
hedge"). In such cases, the Series also may enter into a forward sale contract
to sell a foreign currency for a fixed amount in another currency (other than
the U.S. dollar) where the Series believes that the value of the currency to be
sold pursuant to the forward sale contract will fall whenever there is a decline
in the value of the currency (other than the U.S. dollar) in which certain
portfolio securities of the Series are denominated (a "cross-hedge").
 
Under certain conditions, Securities and Exchange Commission (the "Commission")
guidelines require investment companies to set aside cash or any security that
is not considered restricted or illiquid in a segregated custodial account to
cover forward contracts. As required by Commission guidelines, any Series that
has the ability to enter into a forward contract for an essentially speculative
purpose will, upon entering into such a transaction, segregate assets to cover
such forward contracts. At the present time, Global Growth Series may not enter
into speculative forward contracts. A speculative forward contract is one which,
unlike the hedging situations defined above, does not have an underlying
position in a security or securities. The Series will not segregate assets to
cover forward contracts entered into for hedging purposes.
 
Although forward contracts will be used primarily to protect Global Growth
Series from adverse currency movements, they also involve the risk that
anticipated currency movements will not be accurately predicted.
 
FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS. Global Growth Series may
enter into contracts for the purchase or sale for future delivery of securities
or contracts based on financial indices including any index of U.S. government
securities or corporate debt securities ("futures contracts") and may purchase
and write put and call options to buy or sell futures contracts ("options on
futures contracts"). The Series may enter into futures contracts for the
purchase or sale for future delivery of fixed income securities, and the Series
may enter into futures contracts for the purchase or sale for future delivery of
equity securities. The Series may enter into interest rate futures contracts and
stock index futures contracts. Such Series may enter into contracts for the
purchase or sale for future delivery of foreign currencies. A "sale" of a
futures contract means the undertaking of a contractual obligation to deliver
the securities or foreign currencies called for by the contract at a specified
price on a specified date. A "purchase" of a futures contract means the
undertaking of a contractual obligation to acquire the securities or foreign
currencies called for by the contract at a specified price on a specified date.
The purchaser of a futures contract on an index agrees to take or make delivery
of an amount of cash equal to the difference between a specified dollar multiple
of the value of the index on the expiration date of the contract ("current
contract value") and the price at which the contract was originally struck. No
physical delivery of the fixed-income securities underlying the index is made.
At the time a futures contract is purchased or sold, the Series must allocate
cash or securities as a deposit payment based on a percentage of a contract's
face value. The futures contract is valued daily thereafter and the Series may
be required to contribute additional cash or securities that reflects any
decline in the contract's value. These investment techniques will be used for a
variety of purposes, including hedging against anticipated future changes in
interest rates that otherwise might either adversely affect the value of the
portfolio securities of the Series or adversely affect the prices of securities
or foreign currencies that the Series intends to purchase at a later date.
 
Global Growth Series may write only "covered" call options. An option written on
a security or currency is "covered" when, so long as the Series is obligated
under the option, it owns the underlying security or currency. The Series will
"cover" options on futures contracts it writes by maintaining in a segregated
account either marketable securities which, in Advisers' judgment, correlate to
the underlying futures contract or an amount of cash, or any security that is
not considered restricted or illiquid equal in value to the amount the Series
would be required to pay were the option exercised.
 
Transactions in futures contracts, options on futures contracts, currency
contracts and certain options for hedging purposes involve certain risks. See
"Risk Factors."
 
OPTIONS. Options (a type of potentially high risk derivative) give the investor
the right, but not the obligation, to buy or sell an asset at a predetermined
price in the future. Global Growth Series may write call options and purchase
put and call options on equity and fixed income securities to hedge against the
risk of fluctuations in the prices of securities held by the Series or which
Advisers intend to include in the Series.
 
OPTIONS ON FOREIGN CURRENCIES. Global Growth Series may purchase and write put
and call options on foreign currencies for the purpose of protecting against
declines in the value of foreign currency denominated portfolio securities and
against increases in the cost of such securities to be acquired. As in the case
of other kinds of options, however, the writing of an option on a foreign
currency constitutes only a partial hedge, up to the amount of the premium
received, and the Series could be required to purchase or sell foreign
currencies at disadvantageous exchange rates, thereby incurring losses. The
purchase of an option on a foreign currency may constitute an effective hedge
against fluctuations in exchange rates although, in the event of rate movements
adverse to the Series' position, it may forfeit the entire amount of the premium
plus related transaction costs. Options on foreign currencies to be written or
purchased by the Series are traded on U.S. and foreign exchanges or
over-the-counter.
 
LIMITATIONS ON INVESTMENTS IN DERIVATIVE INSTRUMENTS ON SECURITIES, OPTIONS, AND
FUTURES CONTRACTS. Global Growth Series has adopted two percentage restrictions
on the use of options, futures, and forward contracts. The first restriction is
that the Series will not enter into options, futures, or forward contract
transactions if immediately thereafter the amount of premiums paid for all
options, initial margin deposits on all futures contracts and/or options on
futures contracts, and collateral deposited with respect to forward contracts
held by or entered into by the Series would exceed 5% of the value of the total
assets of the Series. The second restriction is that the aggregate value of the
Series' assets covering, subject to, or committed to all options, futures, and
forward contracts will not exceed 20% of the value of the total assets of the
Series. These two restrictions do not apply to securities purchased on a
when-issued, delayed delivery, or forward commitment basis as described under
"Delayed Delivery Transactions." However, the Series intends to limit its
investment in futures during the coming year so that the aggregate value of the
Series' assets subject to futures contracts will not exceed 5% of the value of
its net assets.
 
DEPOSITARY RECEIPTS. The Global Growth Series may hold equity securities of
foreign issuers in the form of American Depositary Receipts ("ADRs"), European
Depositary Receipts ("EDRs"), or other securities convertible into securities of
eligible European or Far Eastern issuers. These securities may not necessarily
be denominated in the same currency as the securities
 
                                       6
<PAGE>
for which they may be exchanged. ADRs are receipts typically issued by an
American bank or trust company which evidence ownership of underlying securities
issued by a foreign corporation. Generally, ADRs in registered form are designed
for use in the United States securities markets. For purposes of the Global
Growth Series' investment policies, investments in ADRs and EDRs will be deemed
to be investments in the equity securities representing securities of foreign
issuers into which they may be converted.
 
RISK FACTORS. The Global Growth Series' net asset value will fluctuate,
reflecting fluctuations in the market value of its portfolio positions.
 
Foreign investing entails certain risks. The securities of non-U.S. issuers
generally will not be registered with, nor the issuers thereof be subject to,
the reporting requirements of the U.S. Securities and Exchange Commission.
Accordingly, there may be less publicly available information about foreign
securities and issuers than is available about domestic securities and issuers.
Foreign companies are not subject to uniform accounting, auditing, and financial
reporting standards, practices, and requirements comparable to those applicable
to domestic companies. Securities of some foreign companies are less liquid and
their prices may be more volatile than securities of comparable domestic
companies. Settlement periods for foreign securities, which are sometimes longer
than those for securities of U.S. issuers, may affect portfolio liquidity. These
different settlement practices may cause missed purchasing opportunities and/or
the loss of interest on money market and debt investments pending further equity
or long-term debt investments.
 
In addition, with respect to some foreign countries, there is the possibility of
expropriation or confiscatory taxation, limitations on the removal of funds or
other assets of the Global Growth Series, political, or social instability, or
diplomatic or economic developments which could affect the Global Growth Series'
investments in those countries. Moreover, individual foreign economies may
differ favorably or unfavorably from the United States economy in such respects
as growth of gross national product, rate of inflation, rate of savings and
capital reinvestment, resource self-sufficiency and balance of payments
positions. It is anticipated that substantially all of the equities purchased by
the Global Growth Series will be listed on foreign exchanges. Trading volume on
foreign and emerging market stock exchanges is substantially less than that on
the New York Stock Exchange. They also have further risks due to permanent or
temporary termination of trading and greater spreads between bid and asked
prices for securities in such markets. In addition, there is generally less
government supervision and regulation of foreign stock exchanges. Furthermore,
stock markets in emerging markets, such as nations in the Far East, while
offering opportunities for substantial returns, can be more volatile during
periods of investment uncertainty than established major exchanges. Shares of
Global Growth Series, therefore, are subject to greater fluctuation in value
than shares of a conservative equity fund or of a growth fund which invests
entirely in more established markets. The Global Growth Series may incur
additional costs because of generally higher foreign brokerage commissions and
the additional custodial costs associated with maintaining securities. Advisers
will rely on its worldwide financial and investment experience to attempt to
limit these risks.
 
Investing in both U.S. and non-U.S. emerging growth companies involves certain
special risks. The nature of investing in both U.S. and non-U.S. emerging growth
companies involves greater risk than is customarily associated with investments
in more established companies. Emerging growth companies may have limited
product lines, markets, or financial resources, and they may be dependent on a
limited management group. The securities of emerging growth companies may have
limited market stability and may be subject to more abrupt or erratic market
movements than securities of larger, more established companies or the market
averages in general. Shares of Global Growth Series, therefore, are subject to
greater fluctuation in value than shares of a conservative equity fund or of a
growth fund which invests entirely in more established growth stocks.
 
The risks of foreign investing are of greater concern in the case of investments
in emerging markets which may exhibit greater price volatility and have less
liquidity. Further, the economies of emerging market countries generally are
heavily dependent upon international trade and, accordingly, have been and may
continue to be adversely affected by trade barriers, managed adjustments in
relative currency values, and other protectionist measures imposed or negotiated
by the countries with which they trade. These emerging market economies also
have been and may continue to be adversely affected by economic conditions in
the countries with which they trade.
 
Since the Global Growth Series may invest substantially in securities
denominated in currencies other than the U.S. dollar, and since the Global
Growth Series may hold foreign currencies, the Global Growth Series may be
affected favorably or unfavorably by exchange control regulations or changes in
the exchange rates between such currencies and the U.S. dollar. Changes in
currency exchange rates will influence the value of dividends and interest
earned by the Global Growth Series and gains and losses realized by the Global
Growth Series. Exchange rates are determined by the forces of supply and demand
in the foreign exchange markets. These forces are affected by the international
balance of payments and other economic and financial conditions, government
intervention, speculation, and other factors. In addition, the Global Growth
Series may incur costs associated with currency hedging and the conversion of
foreign currency into U.S. dollars and may be adversely affected by restriction
on the conversion or transfer of foreign currency.
 
Also, the Global Growth Series' use of foreign currency forward exchange
contracts and options and futures strategies would involve certain additional
investment risks and transaction costs. These risks include: dependence on
Advisers' ability to predict movements in the prices of individual securities,
fluctuations in the general securities markets and movements in interest rates
and currency markets; imperfect correlation between movements in the price of
currency, options, futures contracts, or options thereon and movements in the
price of the currency or security hedged or used for cover; unexpected adverse
price movements which could render the Series' hedging strategy unsuccessful and
could result in losses; the fact that skills and techniques needed to trade
options, futures contracts and options thereon or to use forward currency
contracts are different from those needed to select the securities in which the
Global Growth Series invests; lack of assurance that a liquid secondary market
will exist for any particular option, futures contract or option thereon at any
particular time; and the possible need to defer closing out certain options,
futures contracts and options thereon in order to continue to qualify for the
beneficial tax treatment afforded "regulated investment companies" under the
Internal Revenue Code. See "Taxation."
 
ZERO COUPON OBLIGATIONS. Global Growth Series may invest in zero coupon
obligations of government and corporate issuers, including rights to "stripped"
coupon and principal payments. Certain obligations are "stripped" of their
coupons, and the rights to receive each coupon payment and the principal payment
are sold as separate securities. Once separated, each coupon as well as the
principal amount represents a different single-payment claim due from the issuer
of the security. Each single-payment claim (coupon or principal) is equivalent
to a zero coupon bond. A zero coupon security pays no interest to its holder
during its life, and its value consists of the difference between its face value
at maturity (the coupon or
 
                                       7
<PAGE>
principal amount), if held to maturity, or its market price on the date of sale,
if sold prior to maturity, and its acquisition price (the discounted "present
value" of the payment to be received).
 
Certain zero coupon obligations represent direct obligations of the issuer of
the "stripped" coupon and principal payments. Other zero coupon obligations are
securities issued by financial institutions which constitute a proportionate
ownership of an underlying pool of stripped coupon or principal payments. The
Global Growth Series may invest in either type of zero coupon obligation. The
investment policies and restrictions applicable to corporate and government
securities in the Series shall apply equally to its investments in zero coupon
securities (including, for example, minimum corporate bond ratings).
 
DELAYED DELIVERY TRANSACTIONS. Global Growth Series may purchase securities on a
"when-issued" or delayed delivery basis and purchase or sell securities on a
"forward commitment" basis. When such transactions are negotiated, the price is
fixed at the time the commitment is made, but delivery and payment for the
securities take place at a later date. Normally, the settlement date occurs
within two months after the transaction, but delayed settlements beyond two
months may be negotiated. At the time the Series enters into a transaction on a
when-issued or forward commitment basis, a segregated account consisting of cash
or any security that is not considered restricted or illiquid, equal to the
value of the when-issued or forward commitment securities will be established
and maintained with the custodian and will be marked to the market daily. During
the period between a commitment and settlement, no payment is made for the
securities and, thus, no interest accrues to the purchaser from the transaction.
If the Series disposes of the right to acquire a when-issued security prior to
its acquisition or disposes of its right to deliver or receive against a forward
commitment, it can incur a gain or loss due to market fluctuation. The use of
when-issued transactions and forward commitments enables the Series to hedge
against anticipated changes in interest rates and prices. The Series may also
enter into such transactions to generate incremental income. In some instances,
the third-party seller of when-issued or forward commitment securities may
determine prior to the settlement date that it will be unable or unwilling to
meet its existing transaction commitments without borrowing securities. If
advantageous from a yield perspective, the Series may, in that event, agree to
resell its purchase commitment to the third-party seller at the current market
price on the date of sale and concurrently enter into another purchase
commitment for such securities at a later date. As an inducement for the Series
to "roll over" its purchase commitment, it may receive a negotiated fee.
 
The purchase of securities on a when-issued, delayed delivery, or forward
commitment basis exposes a Series to risk because the securities may decrease in
value prior to their delivery. Purchasing securities on a when-issued, delayed
delivery, or forward commitment basis involves the additional risk that the
return available in the market when the delivery takes place will be higher than
that obtained in the transaction itself. These risks could result in increased
volatility of a Series' net asset value to the extent that the Series purchases
securities on a when-issued, delayed delivery, or forward commitment basis while
remaining substantially fully invested. No more than 20% of Global Growth
Series' net assets may be invested in when-issued, delayed delivery, or forward
commitment transactions, and of such 20%, no more than one-half (i.e., 10% of
its net assets) may be invested in when-issued, delayed delivery, or forward
commitment transactions without the intention of actually acquiring securities
(i.e., dollar rolls).
 
SECURITIES LENDING. Global Growth Series is authorized to make loans of its
portfolio securities to broker-dealers or to other institutional investors. The
borrower must maintain with the Series' custodian collateral consisting of cash,
U.S. government securities, or other liquid, high-grade fixed income securities
equal to at least 100% of the value of the borrowed securities, plus any accrued
interest. Global Growth Series will receive any interest paid on the loaned
securities and a fee and/or a portion of the interest earned on the collateral.
As a fundamental policy, Global Growth Series will limit its loans of portfolio
securities to an aggregate of 30% of the value of its total assets, measured at
the time any such loan is made. As described in this Prospectus and the
Statement of Additional Information, a certain percentage of the Series' assets
will generally be invested in a described fashion. These percentage calculations
will exclude collateral received by the Series in connection with securities
lending.
 
The risks in lending portfolio securities, as with other extensions of secured
credit, consist of possible delay in receiving additional collateral or in the
recovery of the securities or possible loss of rights in the collateral should
the borrower fail financially. Loans will only be made to firms deemed by Fortis
Advisers, Inc. ("Advisers") to be of good standing and will not be made unless,
in the judgment of Advisers, the consideration to be earned from such loans
would justify the risk.
 
GROWTH STOCK SERIES
 
The primary investment objective of Growth Stock Series is short and long-term
capital appreciation. Current income through the receipt of interest or
dividends from investments will merely be incidental to the efforts of Growth
Stock Series in pursuing its primary objective. Growth Stock Series will
generally invest in mid cap companies representing a diversified cross section
of U.S. industry. For purposes of this Series, mid cap companies are those with
a market capitalization between $1 billion and $5 billion at the time of
purchase.
 
Growth Stock Series will invest primarily in common stocks or securities
convertible into common stocks. Occasionally, however, limited amounts may be
invested in other types of securities (such as nonconvertible preferred and debt
securities). In periods when a more defensive position is deemed warranted,
Growth Stock Series may invest in high grade preferred stocks, bonds and other
fixed income securities (whether or not convertible into or carrying rights to
purchase common stock) or retain cash, all without limitation. Growth Stock
Series may also invest in repurchase agreements, listed and unlisted securities
and up to 10% of its total assets in foreign securities. Investing in foreign
securities may result in greater risk than that incurred in investing in
domestic securities. For a discussion of certain considerations of investing in
foreign securities see "Global Growth Series--Risk Factors."
 
INVESTMENT POLICIES, RESTRICTIONS, AND RISKS APPLICABLE TO MORE THAN ONE SERIES
 
LETTERS OF CREDIT. Commercial paper and other short-term obligations may be
backed by irrevocable letters of credit issued by banks that assume the
obligation for payment of principal and interest in the event of default by an
issuer. Only banks the securities of which, in the opinion of Advisers, are of
investment quality comparable to other permitted investments of such Series may
be used for letter of credit-backed investments.
 
REPURCHASE AGREEMENTS. Each of the Series may invest in repurchase agreements.
 
RESTRICTED OR ILLIQUID SECURITIES. A policy of Money Market Series and Growth
Stock Series which may not be changed without the approval of the shareholders,
is that each such Series may invest up to 5% of the value of its total assets in
securities which it might not be free to sell to the public without registration
of such securities under the Securities Act of 1933 (excluding Rule 144A
securities). However, this policy is further restricted by a policy--which could
be changed without shareholder approval-- which prohibits more than an aggregate
of 10% of each such Series' assets from being invested in: restricted securities
(both debt and equity) or in equity securities of any issuer which are not
readily marketable.
 
Global Growth Series may invest up to 10% of the value of its total assets (at
the time of investment) in securities which are not registered under the
applicable securities laws of the country in which such securities are
 
                                       8
<PAGE>
traded and for which no alternative market is readily available (excluding Rule
144A securities). This policy is restricted by a further policy which could be
changed without shareholder approval--that prohibits more than an aggregate of
10% of Global Growth Series' assets from being invested in (a) restricted
securities (both debt and equity) or in equity securities of any issuer which
are not readily marketable, (b) repurchase agreements with a maturity of more
than seven days, and (c) over-the-counter option and futures contracts.
 
BORROWINGS. Each Series may borrow money from banks as a temporary measure to
facilitate redemptions.
 
As a policy which may not be changed without shareholder approval, however,
borrowings may not exceed 10% of the value of the total assets of Money Market
Series and Growth Stock Series. Global Growth Series' borrowings through banks
and "roll" transactions will not exceed 33 1/3% of its total assets. No
additional investment securities may be purchased by a Series whose outstanding
borrowings, (including "roll" transactions in the case of Global Growth Series)
exceed 5% of the value of such Series' total assets. If market fluctuations in
the value of the portfolio holdings of Global Growth Series or other factors
cause the ratio of Global Growth Series' total assets to outstanding borrowings
to fall below 300%, within three days (excluding Sundays and holidays) of such
event Global Growth Series may be required to sell portfolio securities to
restore the 300% asset coverage, even though from an investment standpoint such
sales might be disadvantageous. Interest paid on borrowings will not be
available for investment.
 
VARIABLE AMOUNT MASTER DEMAND NOTES. Each Series may invest in variable amount
master demand notes. These instruments are short-term, unsecured promissory
notes issued by corporations to finance short-term credit needs. They allow the
investment of fluctuating amounts by the Series at varying market rates of
interest pursuant to arrangements between the Series, as lender, and the
borrower. Variable amount master demand notes permit a series of short-term
borrowings under a single note. Both the lender and the borrower have the right
to reduce the amount of outstanding indebtedness at any time. Such notes provide
that the interest rate on the amount outstanding varies on a daily basis
depending upon a stated short-term interest rate barometer. Advisers will
monitor the creditworthiness of the borrower throughout the term of the variable
master demand note. It is not generally contemplated that such instruments will
be traded and there is no secondary market for the notes. Typically, agreements
relating to such notes provide that the lender shall not sell or otherwise
transfer the note without the borrower's consent. Thus, variable amount master
demand notes may under certain circumstances be deemed illiquid assets. However,
such notes will not be considered illiquid where the Series has a "same day
withdrawal option," i.e., where it has the unconditional right to demand and
receive payment in full of the principal amount of the amount then outstanding
together with interest to the date of payment.
 
MORTGAGE-RELATED SECURITIES. Each Series may invest in mortgage-related
securities. Mortgage-related securities are securities that, directly or
indirectly, represent a participation in (or are secured by and payable from)
mortgage loans on real property. Mortgage-related securities may represent the
right to receive both principal and interest payments on underlying mortgages or
may represent the right to receive varying proportions of such payments. One
type of mortgage-related security includes certificates which represent pools of
mortgage loans assembled for sale to investors by various governmental and
private organizations. Another type of mortgage-related security includes debt
securities which are secured, directly or indirectly, by mortgages on commercial
or residential real estate.
 
Investments in mortgage-related securities involve certain risks. In periods of
declining interest rates, prices of fixed income securities tend to rise.
However, during such periods, the rate of prepayment of mortgages underlying
mortgage-related securities tends to increase, with the result that such
prepayments must be reinvested at lower rates. In addition, the value of such
securities may fluctuate in response to the market's perception of the
creditworthiness of the issuers of mortgage-related securities owned by the
Series. The ability of the issuer of mortgage-related securities to reinvest
favorably in underlying mortgages may be limited by prevailing economic
conditions or by government regulation. Additionally, although mortgages and
mortgage-related securities are generally supported by some form of government
or private guarantee and/or insurance, there is no assurance that private
guarantors or insurers will be able to meet their obligations.
 
SHORT-TERM MONEY MARKET INSTRUMENTS. Each Series may at any time invest funds
awaiting investment or held as reserves for the purposes of satisfying
redemption requests, payment of dividends or making other distributions to
shareholders, in cash and short-term money market instruments. Short-term money
market instruments in which each Series may invest include (i) short-term U.S.
government securities and short-term obligations of foreign sovereign
governments and their agencies and instrumentalities, (ii) interest bearing
savings deposits on, and certificates of deposit and bankers' acceptances of,
United States and foreign banks, (iii) commercial paper of U.S. or foreign
issuers rated A-1 or higher by S&P or Prime-1 by Moody's or comparably rated by
another nationally recognized rating agency, or, if not rated, determined by
Advisers to be of comparable quality and (iv) repurchase agreements relating to
the foregoing.
 
U.S. GOVERNMENT SECURITIES. Each Series may invest in U.S. government
securities, which include: (i) the following U.S. Treasury obligations: U.S.
Treasury bills (initial maturities of one year or less), U.S. Treasury notes
(initial maturities of one to 10 years), and U.S. Treasury bonds (generally
initial maturities of greater than 10 years), all of which are backed by the
full faith and credit of the United States; and (ii) obligations issued or
guaranteed by U.S. government agencies or instrumentalities, including
government guaranteed mortgage-related securities, some of which are backed by
the full faith and credit of the U.S. Treasury, e.g., direct pass-through
certificates of the Government National Mortgage Association; some of which are
supported by the right of the issuer to borrow from the U.S. government, e.g.,
obligations of Federal Home Loan Banks; and some of which are backed only by the
credit of the issuer itself, e.g., obligations of the Student Loan Marketing
Association. U.S. government securities are backed by the full faith and credit
of the U.S. government or guaranteed by the issuing agency or instrumentality
and, therefore, there is generally considered to be no risk as to the issuer's
capacity to pay interest and repay principal. Nevertheless, due to fluctuations
in interest rates, there is no guarantee as to the market value of U.S.
government securities. See "Investment Objectives and Policies" in the Statement
of Additional Information for a further description of obligations issued or
guaranteed by U.S. government agencies or instrumentalities.
 
FLOATING AND VARIABLE RATE INSTRUMENTS. Certain of the obligations that the
Series may purchase have a floating or variable rate of interest. Such
obligations bear interest at rates that are not fixed, but vary with changes in
specified market rates or indices, such as the prime rate, and at specified
intervals. Certain of these obligations may carry a demand feature that would
permit the holder to tender them back to the issuer at par value prior to
maturity. Each Series limits its purchases of floating and variable rate
obligations to those of the same quality as it otherwise is allowed to purchase.
Advisers monitors on an ongoing basis the ability of an issuer of a demand
instrument to pay principal and interest on demand. A Series' right to obtain
payment at par on a demand instrument can be affected by events occurring
between the date such Series elects to demand payment and the date payment is
due that may affect the ability of the issuer of the instrument to make payment
when due, except when such demand instruments permit same-day settlement. To
facilitate settlement, these same-day demand instruments may be held in book
entry form at a bank other than the Series' custodian, subject to a subcustodian
agreement approved by the Series between the bank and the Series' custodian.
 
                                       9
<PAGE>
The floating and variable rate obligations that the Series may purchase include
certificates of participation in obligations purchased from banks. A certificate
of participation gives the Series an undivided interest in the underlying
obligations in the proportion that such Series' interest bears to the total
principal amount of such obligations. Certain of such certificates of
participation may carry a demand feature that would permit the holder to tender
them back to the issuer prior to maturity. To the extent that floating and
variable rate instruments without demand features are not readily marketable,
they will be subject to the investment restrictions pertaining to investments in
illiquid securities. See "Restricted or Illiquid Securities" above.
 
GENERAL CONSIDERATIONS. Any investment restriction or limitation, fundamental or
otherwise, that involves a maximum percentage of securities or assets shall not
be considered to be exceeded (except in the case of the limitation on illiquid
investments), unless an excess over the percentage occurs immediately after an
acquisition of securities or utilization of assets, and such excess results
therefrom.
 
After purchase by the Series, a security may cease to be rated or its rating may
be reduced below the minimum required for purchase by such Series. Neither event
will require a sale of such security by the Series. To the extent the ratings
may change as a result of changes in the rating organizations or the rating
systems, the Series will attempt to use comparable ratings as standards for
investments in accordance with the investment policies contained in the
Statement of Additional Information.
 
The insurance laws and regulations of various states as well as the Internal
Revenue Code of 1986 and regulations thereunder may, from time to time, impose
additional restrictions on the investments of the various Series.
 
GENERAL RISKS TO CONSIDER
 
An investment in any of the Series involves certain risks in addition to those
noted elsewhere in this Prospectus and the Statement of Additional Information
with respect to particular Series. These include the following:
 
EQUITY SECURITIES GENERALLY. Market prices of equity securities generally, and
of particular companies' equity securities, frequently are subject to greater
volatility than prices of fixed income securities. Market prices of equity
securities as a group have dropped dramatically in a short period of time on
several occasions in the past, and they may do so again in the future. Each of
the Series which may purchase equity securities (such as common and preferred
stocks) is subject to the risk of generally adverse equity markets.
 
COMMON AND PREFERRED STOCKS. Stocks represent shares of ownership in a company.
Generally, preferred stock has a specified dividend and ranks after bonds and
before common stocks in its claim on income for dividend payments and on assets
should the company be liquidated. After other claims are satisfied, common
stockholders participate in company profits on a pro rata basis; profits may be
paid out in dividends or reinvested in the company to help it grow. Increases
and decreases in earnings are usually reflected in a company's stock price, so
common stocks generally have the greatest appreciation and depreciation
potential of all corporate securities.
 
SMALLER-CAPITALIZATION COMPANIES. The equity securities of
smaller-capitalization companies may involve greater risks and volatility than
the equity securities of larger, more mature companies due to some of these
companies potentially having limited product lines, reduced market liquidity for
the trading of their shares, limited financial resources and less depth in
management than more established companies. Smaller companies also may be less
significant factors within their industries and may have difficulty withstanding
competition from larger companies. Therefore, Series that invest in
smaller-capitalization companies are not intended as a complete or balanced
investment vehicle but rather as an investment for persons who are in a
financial position to assume greater risk and share price volatility. Realizing
the full potential of these types of companies frequently takes time.
 
CONVERTIBLE SECURITIES AND WARRANTS. Certain Series may invest in debt or
preferred equity securities convertible into or exchangeable for equity
securities. Traditionally, convertible securities have paid dividends or
interest at rates higher than common stocks but lower than non-convertible
securities. They generally participate in the appreciation or depreciation of
the underlying stock into which they are convertible, but to a lesser degree. In
recent years, convertibles have been developed which combine higher or lower
current income with options and other features. Warrants are options to buy a
stated number of shares of common stock at a specified price any time during the
life of the warrants (generally, two or more years).
 
INTEREST RATE RISK. Interest rate risk is the risk that the value of a fixed-
rate debt security will decline due to changes in market interest rates. Because
the Series invest in fixed-rate debt securities, they are subject to interest
rate risk. In general, when interest rates rise, the value of a fixed-rate debt
security declines. Conversely, when interest rates decline, the value of a
fixed-rate debt security generally increases. Thus, shareholders in the Series
bear the risk that increases in market interest rates will cause the value of
their Series' portfolio investments to decline.
 
In general, the value of fixed-rate debt securities with longer maturities is
more sensitive to changes in market interest rates than the value of such
securities with shorter maturities. Thus, the net asset value of a Series which
invests in securities with longer weighted average maturities (or longer
durations) should be expected to have greater volatility in periods of changing
market interest rates than that of a Series which invests in securities with
shorter weighted average maturities (or shorter durations). As described below
under "Mortgage-Backed Securities," it is more difficult to generalize about the
effect of changes in market interest rates on the values of mortgage-backed
securities.
 
Although Advisers may for certain Series engage in transactions intended to
hedge the value of a Series' portfolio against changes in market interest rates,
there is no assurance that such hedging transactions will be undertaken or will
fulfill their purpose.
 
CREDIT RISK. Credit risk is the risk that the issuer of a debt security will
fail to make payments on the security when due. Because the Series invest in
debt securities, they are subject to credit risk.
 
Securities issued or guaranteed by the United States Government generally are
viewed as carrying minimal credit risk. Securities issued by governmental
entities but not backed by the full faith and credit of the United States, and
securities issued by private entities, are subject to higher levels of credit
risk. The ratings and certain other requirements which apply to the Series'
permitted investments, as described elsewhere in this Prospectus, are intended
to limit the amount of credit risk undertaken by the Series. Nevertheless,
shareholders in the Series bear the risk that payment defaults could cause the
value of their Series' portfolio investments to decline.
 
CALL RISK. Many corporate bonds may be redeemed at the option of the issuer
("called") at a specified price prior to their stated maturity date. In general,
it is advantageous for a corporate issuer to call its bonds if they can be
refinanced through the issuance of new bonds which bear a lower interest rate
than that of the called bonds. Call risk is the risk that corporate bonds will
be called during a period of declining market interest rates so that such
refinancings may take place.
 
If a bond held by a Series is called during a period of declining interest
rates, the Series probably will have to reinvest the proceeds received by it at
a lower interest rate than that borne by the called bond, thus resulting in a
decrease in the Series' income. To the extent that the Series invest in
 
                                       10
<PAGE>
callable corporate bonds, Series shareholders bear the risk that reductions in
income will result from the call of the bonds. Most United States Government
securities are not callable before their stated maturity.
 
MORTGAGE-BACKED SECURITIES. Because residential mortgage loans generally can be
prepaid in whole or in part by the borrowers at any time without any prepayment
penalty, the holder of a mortgage-backed security which represents an interest
in a pool of such mortgage loans is subject to a form of call risk which is
generally called "prepayment risk." In addition, it is more difficult to predict
the effect of changes in market interest rates on the return on mortgage-backed
securities than to predict the effect of such changes on the return of a
conventional fixed-rate debt instrument, the magnitude of such effects may be
greater in some cases, and the return on certain types of mortgage-backed
securities, such as interest-only, principal-only and inverse floating rate
mortgage-backed securities, is particularly sensitive to changes in interest
rates and in the rate at which the mortgage loans underlying the securities are
prepaid by borrowers. For these reasons, a Series' investments in
mortgage-backed securities may involve greater risks than investments in
governmental or corporate bonds. For further information, see "Investment
Policies, Restrictions, and Risks Applicable to More Than One Series--Mortgage
Related Securities."
 
ACTIVE MANAGEMENT. All of the Series are actively managed by Advisers. The
performance of these Series therefore will reflect in part the ability of
Advisers to select securities which are suited to achieving the Series'
investment objectives. Due to their active management, these Series could
underperform other mutual funds with similar investment objectives or the market
generally.
 
MANAGEMENT
 
BOARD OF DIRECTORS
 
Under Minnesota law, the Board of Directors of Fortis Series (the "Board of
Directors") has overall responsibility for managing Fortis Series in good faith,
in a manner reasonably believed to be in the best interests of Fortis Series,
and with the care an ordinarily prudent person would exercise in similar
circumstances. However, this management may be delegated. The Articles of
Incorporation of Fortis Series limit the liability of directors to the fullest
extent permitted by law.
 
THE INVESTMENT ADVISER/TRANSFER AGENT/DIVIDEND AGENT
 
Fortis Advisers, Inc. ("Advisers") is the investment adviser, transfer agent,
and dividend agent for each Series. Advisers has been managing investment
company portfolios since 1949, and is indirectly owned 50% by Fortis AMEV and
50% by Fortis AG, diversified financial services companies. In addition to
providing investment advice, Advisers is responsible for management of Fortis
Series' business affairs, subject to the overall authority of the Board of
Directors. Advisers' address is P.O. Box 64284, St. Paul, MN 55164.
 
Money Market Series has been managed by Howard G. Hudson, Robert C. Lindberg,
Maroun M. Hayek, and David C. Greenzang since 1995.
 
Global Growth Series has been managed since its inception by James S. Byrd who
has primary responsibility for day-to-day management of the Series. Diane M.
Gotham has participated in management of the Series since the date of this
Prospectus.
 
Growth Stock Series has been managed by Michael J. Romanowski since March, 1998.
 
Mr. Hudson, Executive Vice President and Head of Fixed Income Investments of
Advisers, has been managing debt securities for Fortis, Inc. since 1991. Mr.
Hudson reports to Gary N. Yalen, the President and Chief Investment Officer of
Advisers. Mr. Hudson performs a supervisory function in the management of the
fixed income Series. The portfolio managers supervised by Mr. Hudson have
primary responsibility for these Series investments in particular types of
securities. Specifically, these individuals and their areas of responsibility
are as follows: Mr. Hayek, corporate bonds; Mr. Lindberg, municipal securities;
and Mr. Greenzang, money market instruments. Mr. Hayek, a Vice President of
Advisers since 1995, has been managing debt securities for Fortis, Inc. since
1987. Mr. Lindberg, a Vice President of Advisers, has been managing debt
securities for Advisers since 1993. Mr. Greenzang, a Money Market Portfolio
officer, has been involved in management of debt securities for Fortis, Inc.
since 1992.
 
Lucinda S. Mezey, Executive Vice President and Head of Equity Investments of
Advisers, has worked for Advisers since October 1997. From 1995 to October 1997,
she was Chief Investment Officer, Alex Brown Capital Advisory and Trust Co.,
Baltimore, MD and from 1970 to 1995 she was employed by PNC Bank, Philadelphia,
PA with her last position being Senior Vice President and Head of Equity
Investments. Ms. Mezey performs a supervisory function in the management of the
equity Series. Mr. Byrd is an Executive Vice President of Advisers. Mr. Byrd has
managed portfolios for Advisers for more than five years. Ms. Gotham has been a
Vice President of Advisers since 1998. She was a securities analyst for Advisers
from 1994 to 1998 and a systems engineer for International Business Machines
("IBM") Minneapolis, MN from 1981 to 1993. Mr. Romanowski, a Vice President of
Advisers since 1998, was a portfolio manager for Value Line, New York, NY from
October 1995 to March 1998, prior to which he was a securities analyst for
Conning & Co. in Hartford, CT from 1992 to 1995.
 
Messrs. Hudson, Yalen, Hayek, Lindberg, Greenzang, Romanowski and Ms. Mezey are
located at One Chase Manhattan Plaza, New York, NY, 10005 and Mr. Byrd and Ms.
Gotham are located at 5500 Wayzata Blvd., Golden Valley, MN, 55416.
 
THE UNDERWRITER
 
Fortis Investors, Inc. ("Investors"), a subsidiary of Advisers, is the Fund's
underwriter. Investors' address is that of Fortis Series.
 
EXPENSES
 
For the most recent fiscal year, the ratio of Fortis Series' investment advisory
and management fee as a percentage of average daily net assets was .30% for
Money Market Series, .70% for Global Growth Series, and .61% for Growth Stock
Series.
 
BROKERAGE ALLOCATION
 
Advisers may consider sales of shares of Fortis Series, and of other funds
advised by Advisers, as a factor in the selection of broker-dealers to execute
Fortis Series' securities transactions when it is believed that this can be done
without causing Fortis Series to pay more in brokerage commissions than it would
otherwise.
 
PERIODIC REPORTS
 
Contract owners will receive semiannual reports including the financial
statements of the Series to which their premiums have been allocated and the
investments held in each such Series.
 
THE SEPARATE ACCOUNTS AND THE CONTRACTS
 
Shares in Fortis Series are currently sold to separate accounts of Fortis
Benefits and First Fortis which fund benefits under variable life insurance
policies and variable annuity contracts issued by Fortis Benefits and First
Fortis. Each Contract owner allocates Contract value among the subaccounts of
the Separate Accounts, which in turn invest in the corresponding Series of
Fortis Series. The rights of the Separate Accounts as shareholders should be
distinguished from the rights of a Contract owner, which are described in the
Contract. The term "shareholder" or "shareholders" in
 
                                       11
<PAGE>
this Prospectus refers to Fortis Benefits, First Fortis, any of their
affiliates, or any other insurance company that owns Fortis Series shares.
"Contract owner" means the owner, annuitant, or beneficiary that is entitled to
exercise the rights and privileges under a Contract.
 
GENERAL INFORMATION
 
Fortis Series has only common shares with equal voting rights.
 
VOTING PRIVILEGES
 
The voting privileges of Contract owners, and limitations thereon, are explained
in the accompanying prospectus for the Contracts. The shareholders are entitled
to vote all of the shares of Fortis Series, but they will generally do so in
accordance with the instructions of the Contract owners. Under certain
circumstances, however, shareholders may disregard voting instructions received
from Contract owners. For additional information describing how shareholders
will vote the shares of Fortis Series, see "Voting Privileges" in the
accompanying prospectus(es) for the applicable Contracts.
 
YEAR 2000
 
Like other mutual funds, financial and business organizations around the world,
Fortis Series could be adversely affected if the computer systems used by it,
Advisers and other service providers and entities with computer systems that are
linked to Fortis Series records do not properly process and calculate
date-related information and data from and after January 1, 2000. This is
commonly known as the "Year 2000 issue." The Series and Advisers and its
affiliates are taking steps that they believe are reasonably designed to address
the Year 2000 issue with respect to the computer systems they use and to obtain
satisfactory assurances that comparable steps are being taken by each of the
Series' other major service providers. However, there can be no assurance that
these steps will be sufficient to avoid an adverse impact on the Series.
 
DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
Fortis Series intends to distribute at least annually as dividends substantially
all the net investment income, if any, of each Series. For dividend purposes,
net investment income of each Series will consist of all dividends (other than
stock dividends) or interest received by such Series less the accrued expenses
of each such Series. Fortis Series will also declare and distribute all net
realized capital gains annually. Dividends from investment income of the Series
and capital gains distributions will be reinvested in additional full and
fractional shares. Dividends and distributions on shares not attributable to
Contracts, however, may be paid in cash.
 
TAXATION
 
Each Series intends to qualify as a regulated investment company under the
Internal Revenue Code of 1986, as amended. So long as each Series so qualifies,
the Series is not taxed on the income it distributes to the Separate Accounts.
So long as each Series qualifies as a regulated investment company and meets
certain diversification tests applicable to the segregated asset accounts
underlying variable annuity and life insurance contracts, the Contract owners
will not be considered to be the owners of the shares of the Series, and income
earned with respect to the Contracts will not be taxed currently to the Contract
owners.
 
For the tax consequences of owning a Contract, see the accompanying prospectus
for the Contracts. For more information concerning the taxation of the Series,
see "Taxation" in the Statement of Additional Information.
 
PURCHASE AND REDEMPTION OF SHARES
 
GENERALLY
 
Shares in Fortis Series are currently offered at the respective per share net
asset value of each Series. Such shares are offered only to the Separate
Accounts, which fund benefits payable under the Contracts described in the
accompanying prospectus. Fortis Series sells its shares to the Separate Accounts
through Fortis Investors, Inc. ("Investors"). Investors receives no underwriting
compensation from Fortis Series. Fortis Series may in the future also offer its
shares to separate accounts of other insurance companies.
 
The Board of Directors will monitor events for the existence of any material
irreconcilable conflict between or among owners of insurance or annuity
contracts, and the relevant insurance companies will take whatever remedial
action may be necessary and appropriate. Fortis Benefits and First Fortis
currently do not foresee any disadvantages to their respective Contract owners
arising out of the fact that Fortis Series offers its shares both for variable
life insurance policies and variable annuity contracts. However, should an
irreconcilable conflict arise between the Separate Accounts, the conflict could
result in one or more of the Separate Accounts terminating its relationship with
Fortis Series, thus necessitating the liquidation of portfolio securities and
thereby potentially having an adverse impact on the net asset values of the
affected Series.
 
On each day when Fortis Series values its assets, shares of each Series are
purchased or redeemed by the Separate Accounts based upon, among other things,
the amounts of net premiums allocated to the Separate Account, dividends and
distributions reinvested, transfers to and among subaccounts of the Separate
Accounts, policy loans, loan repayments and benefit payments to be processed on
that date. Such purchases and redemptions for the Separate Account are effected
at the net asset value per share for each Series determined as of that same
date. Any orders to purchase or redeem Fortis Series shares that do not result
automatically from Contract transactions will be effected at the net asset value
per share next computed after the order is placed.
 
Investors, Advisers and Fortis Series each reserve the right to reject any
purchase order.
 
OFFERING PRICE
 
The offering prices of each Series' shares are determined once daily and are
equal to the net asset values per share of the shares next calculated after
receipt of the purchase order. The Series' net asset values per share are
determined by dividing the value of the securities owned by the Series, plus any
cash or other assets, less all liabilities, by the number of the Series' shares
outstanding. All significant expenses, including the investment advisory fee
payable to Advisers, are accrued daily. The portfolio securities in which the
Series invest fluctuate in value, and hence the net asset values per share of
the Series also fluctuate. The net asset values of the Series' shares are
determined as of the close of regular trading on the New York Stock Exchange
(the "Exchange") on each day on which the Exchange is open.
 
Securities are generally valued at market value. A security listed or traded on
an exchange is valued at its last sale price on the exchange where it is
principally traded on the day of valuation. Lacking any sales on the exchange
where it is principally traded on the day of valuation, prior to the time as of
which assets are valued, the security generally is valued at the previous day's
last sale price on that exchange. A security listed or traded on the Nasdaq
National Market is valued at its last sale price that day, and lacking any sales
that day on the Nasdaq National Market, the security generally is valued at the
last bid price. Options will be valued at market value or fair value, as
determined in good faith by the Board of Directors, if no market exists. Futures
contracts will be valued in a like manner except
 
                                       12
<PAGE>
that open futures contracts sales will be valued using the closing settlement
price or, in the absence of such a price, the most recent quoted asked price.
 
An outside pricing service may be utilized to provide valuations of debt
securities. The pricing service may employ electronic data processing techniques
and/or a matrix system to determine valuations using methods which include
consideration of yields or prices of bonds of comparable quality, type of issue,
coupon, maturity and rating; indications as to value from dealers; and general
market conditions. When market quotations are not readily available, or when
illiquid securities or other assets are being valued, such securities or other
assets are valued at fair value as determined in good faith by management under
supervision of the Series' Board of Directors. Short-term investments in debt
securities with maturities of less than 60 days when acquired, or which
subsequently are within 60 days of maturity, are valued at amortized cost.
Purchases and sales by the Series after 2:00 P.M. Central Time normally are not
recorded until the following business day.
 
Any assets or liabilities initially expressed in terms of foreign currencies are
translated into U.S. dollars at the official exchange rate or, alternatively, at
the mean of the current bid and asked prices of such currencies against the U.S.
dollar last quoted by a major bank that is a regular participant in the foreign
exchange market or on the basis of a pricing service that takes into account the
quotes provided by a number of such major banks. If neither of these
alternatives is available nor provides a suitable methodology for converting a
foreign currency into U.S. dollars, the Board of Directors in good faith will
establish a conversion rate for such currency.
 
European or Far Eastern securities trading may not take place on all days on
which the Exchange is open. Trading in securities on European and Far Eastern
securities exchanges and over-the-counter markets is normally completed well
before the close of the business day in New York. Further, trading takes place
in Japanese markets on certain Saturdays and in various foreign markets on days
on which the Exchange is not open and therefore the Series' net asset value is
not calculated. The calculation of the Series' net asset value therefore may not
take place contemporaneously with the determination of the prices of securities
held by the Series. Events affecting the values of portfolio securities that
occur between the time their prices are determined and the close of the Exchange
will not be reflected in the Series' net asset value unless management, under
the supervision of the Board of Directors, determines that the particular event
would materially affect net asset value. As a result, the Series' net asset
value may be significantly affected by such trading on days when Fortis Series
is not open for shareholder purchases and redemptions.
 
TRANSFERS AMONG SUBACCOUNTS
 
Contract owners may transfer amounts among the subaccounts available to them,
and may change allocations of premiums as explained in the accompanying
prospectus for the Contracts. These transfers have the effect of changing a
contract owners' participation in the various Series. Such transfers between
subaccounts are not taxable under current Federal income tax law.
 
REDEMPTION
 
Fortis Series is required to redeem all full and fractional shares of Fortis
Series for cash within seven days of receipt of proper notice of redemption. The
net asset value of redeemed shares may be more or less than the net asset value
of the same shares at the time the Separate Account invested in such shares.
 
For further information, Contract owners may also contact Fortis Benefits'
office, the address of which is the same as that of Fortis Series, as set forth
on the cover of this Prospectus. New York contract owners should contact First
Fortis' office: P.O. Box 3209, Syracuse, New York 13220.
 
APPENDIX
 
COMMERCIAL PAPER RATINGS
 
STANDARD & POOR'S RATINGS SERVICES. A Standard & Poor's commercial paper rating
is a current assessment of the likelihood of timely payment of debt having an
original maturity of no more than 365 days. Ratings are graded into categories
ranging from "A" for the highest quality obligations to "D" for the lowest.
 
"A"   Issues assigned this highest rating are regarded as having the greatest
      capacity for timely payment. Issues in this category are delineated with
      the numbers 1, 2 and 3 to indicate the relative degree of safety.
 
"A-1"  This designation indicates that the degree of safety regarding timely
       payment is either overwhelming or very strong. Those issues determined to
       possess overwhelming safety characteristics are denoted with a (+) sign
       designation.
 
"A-2"  Capacity for timely payment on issues with this designation is strong.
       However, the relative degree of safety is not as high as for issues
       designated "A-1."
 
"A-3"  Issues carrying this designation have a satisfactory capacity for timely
       payment. They are, however, somewhat more vulnerable to the adverse
       effects of changes in circumstances than obligations carrying the higher
       designations.
 
The commercial paper rating is not a recommendation to purchase or sell a
security. The ratings are based on current information furnished to Standard &
Poor's by the issuer or obtained from other sources it considers reliable. The
ratings may be changed, suspended, or withdrawn as a result of changes in or
unavailability of such information.
 
MOODY'S INVESTORS SERVICE, INC. Moody's short-term debt ratings are opinions of
the ability of the issuers to repay punctually senior debt obligations which
have an original maturity not exceeding one year. Moody's makes no
representation that such obligations are exempt from registration under the
Securities Act of 1933, nor does it represent that any specific note is a valid
obligation of a rated issuer or issued in conformity with any applicable law.
Moody's employs the following three designations, all judged to be investment
grade, to indicate the relative repayment capacity of rated issuers:
 
"Prime-1"  Superior ability for repayment of senior short-term debt obligations.
 
"Prime-2"  Strong ability for repayment of senior short-term debt obligations.
 
"Prime-3"  Acceptable ability for repayment of senior short-term debt
           obligations.
 
CORPORATE BOND RATINGS
 
Note: Standard & Poor's Corporation ratings from "AA" to "CCC" may be modified
by the addition of a plus or minus sign to show relative standing within the
major rating categories. Moody's Investors Service, Inc., applies to numerical
modifiers 1, 2 and 3 in each generic rating classification from "Aa" to "B." The
modifier "1" indicates that the applicable company ranks in the higher end of
its generic rating category; the modifier "2" indicates a mid-range ranking; and
the modifier "3" indicates that the applicable company ranks in the lower end of
its generic rating category.
 
STANDARD & POOR'S RATINGS SERVICES. Its ratings for corporate bonds have the
following definitions:
 
Debt rated "AAA" has the highest rating assigned by Standard & Poor's. Capacity
to pay interest and repay principal is extremely strong.
 
                                       13
<PAGE>
Debt rated "AA" has a very strong capacity to pay interest and repay principal
and differs from the higher rated issues only in a small degree.
 
Debt rated "A" has a strong capacity to pay interest and repay principal,
although it is somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than debt in higher rated categories.
 
Debt rated "BBB" is regarded as having an adequate capacity to pay interest and
repay principal. Whereas it normally exhibits adequate protection parameters,
adverse economic conditions or changing circumstances are more likely to lead to
a weakened capacity to pay interest and repay principal for debt in this
category than in higher rated categories.
 
Debt rated "BB," "B," "CCC," "CC," and "C" is regarded, on balance, as
predominantly speculative with respect to capacity to pay interest and repay
principal in accordance with the terms of the obligation. "BB" indicates the
lowest degree of speculation and "C" the highest degree of speculation. While
such debt will likely have some quality and protective characteristics, these
are outweighed by large uncertainties or major risk exposures to adverse
conditions.
 
Debt rated "BB" has less near-term vulnerability to default than other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse business, financial, or economic conditions which could lead to
inadequate capacity to meet timely interest and principal payments. The "BB"
rating category is also used for debt subordinated to senior debt that is
assigned an actual or implied "BBB-" rating.
 
Debt rated "B" has a greater vulnerability to default but currently has the
capacity to meet interest payments and principal repayments. Adverse business,
financial, or economic conditions will likely impair capacity or willingness to
pay interest and repay principal. The "B" rating category is also used for debt
subordinated to senior debt that is assigned an actual or implied "BB" or "BB-"
rating.
 
Debt rated "CCC" has a currently identifiable vulnerability to default, and is
dependent upon favorable business, financial, and economic conditions to meet
timely payment of interest and repayment of principal. In the event of adverse
business, financial, or economic conditions, it is not likely to have the
capacity to pay interest and repay principal. The "CCC" rating category is also
used for debt subordinated to senior debt that is assigned an actual or implied
"B" or "B-" rating.
 
The rating "CC" is typically applied to debt subordinated to senior debt that is
assigned an actual or implied "CCC" rating.
 
The rating "C" is typically applied to debt subordinated to senior debt which is
assigned an actual or implied "CCC-" debt rating. The "C" rating may be used to
cover a situation where a bankruptcy petition has been filed, but debt service
payments are continued.
 
The rating "CI" is reserved for income bonds on which no interest is being paid.
 
Debt rated "D" is in payment default. The "D" rating category is used when
interest payments or principal payments are not made on the date due even if the
applicable grace period has not expired, unless Standard & Poor's believes that
such payments will be made during such grace period. The "D" rating also will be
used upon the filing of a bankruptcy petition if debt service payments are
jeopardized.
 
"NR" indicates that no rating has been requested, that there is insufficient
information on which to base a rating, or that Standard & Poor's does not rate a
particular type of obligation as a matter of policy.
 
MOODY'S INVESTORS SERVICE, INC. Its ratings for corporate bonds include the
following:
 
Bonds which are rated "Aaa" are judged to be of the best quality. They carry the
smallest degree of investment risk and are generally referred to as "gilt edge."
Interest payments are protected by a large or by an exceptionally stable margin
and principal is secure. While the various protective elements are likely to
change, such changes as can be visualized are most unlikely to impair the
fundamentally strong position of such issues.
 
Bonds which are rated "Aa" are judged to be of high quality by all standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds. They are rated lower than the best bonds because margins of protection
may not be as large as in Aaa securities or fluctuation of protective elements
may be of greater amplitude or there may be other elements present which make
the long-term risk appear somewhat larger than in Aaa securities.
 
Bonds which are rated "A" possess many favorable attributes and are to be
considered as upper medium grade obligations. Factors giving security to
principal and interest are considered adequate but elements may be present which
suggest a susceptibility to impairment sometime in the future.
 
Bonds which are rated "Baa" are considered as medium grade obligations, i.e.,
they are neither highly protected nor poorly secured. Interest payments and
principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.
 
Bonds which are rated "Ba" are judged to have speculative elements; their future
cannot be considered as well assured. Often the protection of interest and
principal payments may be very moderate and thereby not well safeguarded during
both good and bad times over the future. Uncertainty of position characterizes
bonds in this class.
 
Bonds which are rated "B" generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
 
Bonds which are rated "Caa" are of poor standing. Such issues may be in default
or there may be present elements of danger with respect to principal or
interest.
 
Bonds which are rated "Ca" represent obligations which are speculative in a high
degree. Such issues are often in default or have other marked shortcomings.
 
Bond which rated "C" are the lowest rated class of bonds and issues so rated can
be regarded as having extremely poor prospects of ever attaining any real
investment standing.
 
BOND INVESTMENT QUALITY STANDARDS: Under present commercial bank regulations
issued by the Comptroller of the Currency, bonds rated in the top four
categories (Moody's ratings Aaa, Aa, A and Baa, and Standard & Poor's ratings
AAA, AA, A and BBB, commonly known as "Investment Grade" ratings) are generally
regarded as eligible for bank investment. In addition, the Legal Investment Laws
of various states impose certain rating or other standards for obligations
eligible for investment by savings banks, trust companies, insurance companies
and fiduciaries generally.
 
PREFERRED STOCK RATING
 
Note: Standard & Poor's Corporation ratings from "AA" to "CCC" may be modified
by the addition of a plus or minus sign to show relative standing within the
major rating categories. Moody's Investors Service, Inc., applies to numerical
modifiers 1, 2 and 3 in each generic rating classification from "Aa" to "B." The
modifier "1" indicates that the applicable company ranks in the higher end of
its generic rating category; the modifier "2" indicates a mid-range ranking; and
the modifier "3" indicates that the applicable company ranks in the lower end of
its generic rating category.
 
                                       14
<PAGE>
STANDARD & POOR'S RATINGS SERVICE. Its ratings for preferred stock have the
following definitions:
 
An issue rated "AAA" has the highest rating that may be assigned by Standard &
Poor's to a preferred stock issue and indicates an extremely strong capacity to
pay the preferred stock obligations.
 
A preferred stock issue rated "AA" also qualifies as a high-quality fixed income
security. The capacity to pay preferred stock obligations is very strong,
although not as overwhelming as for issues rated "AAA."
 
An issue rated "A" is backed by a sound capacity to pay the preferred stock
obligations, although it is somewhat more susceptible to the adverse effects of
changes in circumstances and economic conditions.
 
An issue rated "BBB" is regarded as backed by an adequate capacity to pay the
preferred stock obligations. Whereas it normally exhibits adequate protection
parameters, adverse economic conditions, or changing circumstances are more
likely to lead to a weakened capacity to make payments for a preferred stock in
this category than for issues in the "A" category.
 
MOODY'S INVESTORS SERVICE, INC. Its ratings for preferred stock include the
following:
 
An issue which is rated "Aaa" is considered to be a top-quality preferred stock.
This rating indicates good asset protection and the least risk of dividend
impairment within the universe of preferred stocks.
 
An issue which is rated "Aa" is considered a high-grade preferred stock. This
rating indicates that there is reasonable assurance that earnings and asset
protection will remain relatively well maintained in the foreseeable future.
 
An issue which is rated "A" is considered to be an upper-medium grade preferred
stock. While risks are judged to be somewhat greater than in the "aaa" and "aa"
classifications, earnings and asset protection are nevertheless expected to be
maintained at adequate levels.
 
An issue which is rated "Baa" is considered to be medium grade, neither highly
protected nor poorly secured. Earnings and asset protection appear adequate at
present but may be questionable over any great length of time.
 
                                       15
<PAGE>
PROSPECTUS
MAY 1, 1998
 
FORTIS
SERIES FUND, INC.
 
A SERIES FUND WITH THREE AVAILABLE SERIES,
EACH WITH DIFFERENT GOALS AND INVESTMENT POLICIES
 
59101 (REV. 5/98)
 
    [LOGO]
 
FORTIS FINANCIAL GROUP
P.O. BOX 64284
ST. PAUL, MN 55164
                                            BULK RATE
                                           U.S. POSTAGE
                                               PAID
                                         PERMIT NO. 3794
                                         MINNEAPOLIS, MN


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