LORD ABBETT SECURITIES TRUST
485APOS, 1999-04-21
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                                                      1933 Act File No. 33-58846
                                                      1940 Act File No. 811-7538

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933          [X]

                         Pre-Effective Amendment No.                         [ ]

                       Post-Effective Amendment No. 30                       [X]

                                     and/or

            REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT          [X]
                                     OF 1940

                               Amendment No. 30                              [X]

                          LORD ABBETT SECURITIES TRUST
                Exact Name of Registrant as Specified in Charter

                  767 FIFTH AVENUE, NEW YORK, N. Y. 10153-0203
                      Address of Principal Executive Office

                  Registrant's Telephone Number (212) 848-1800

                       Lawrence H. Kaplan, Vice President
                     767 FIFTH AVENUE, NEW YORK, N. Y. 10153
                      Name and Address of Agent for Service

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

                immediately upon filing pursuant to paragraph (b)
      ---------

                on (date) pursuant to paragraph (b)
      ---------

                60 days after filing pursuant to paragraph (a) (1)
      ---------

                on (date) pursuant to paragraph (a) (1)
      ---------

          X     75 days after filing pursuant to paragraph (a) (2)
      ---------

                on (date) pursuant to paragraph (a) (2) of rule 485
      ---------

If appropriate, check the following box:

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


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Lord 
Abbett

Micro-Cap Growth Fund
Micro-Cap Value Fund

Class Y Shares
Prospectus
Date to be provided

[LOGO]

As with all mutual funds, the Securities and Exchange Commission does not
guarantee that the information in this prospectus is accurate or complete, and
it has not judged these funds for investment merit. It is a criminal offense to
state otherwise.



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                               Table of Contents

<TABLE>
<CAPTION>
                                                                            Page
<S>                           <C>                                            <C>
                                   The Funds

     Information about the    Goal / Approach                                  2
goal/strategy, main risks,    Main Risks                                       3
         fees and expenses    Micro-Cap Growth Fund                            4
                              Micro-Cap Value Fund                             4

                                Your Investment

Information for managing      Purchases                                        5
       your fund account      Redemptions                                      6
                              Distributions and Taxes                          6
                              Services For Fund Investors                      7
                              Management                                       8

                              For More Information

How to learn more             Other Investment Techniques                      9
  about the funds             Glossary of Shaded Terms                        13

How to learn more about the   Back Cover
funds and other Lord Abbett 
funds
</TABLE>



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                                                          Micro-Cap Growth Fund
                                                          Micro-Cap Value Fund
                                   The Funds

GOAL / STRATEGY

      Each fund's investment objective is long-term capital appreciation. The
      funds will attempt to reach this goal primarily through investing in the
      equity securities of companies with market capitalizations of less than
      $350 million, which we consider to be micro-cap companies. With the
      exception of temporary defensive positions, the funds will each invest at
      least 80% of their assets in micro-cap companies. Normally, the funds
      attempt to be as fully invested as possible. The funds may invest up to
      10% of their assets in foreign micro-cap stocks.

            The Micro-Cap Growth Fund uses fundamental analysis to look for
            companies which appear to have the potential for more rapid growth
            than the overall economy.

            The Micro-Cap Value Fund looks for undervalued micro-cap stocks. We
            consider a stock undervalued if, in our view, its price does not
            reflect its potential worth. Because of their small size and less
            frequent trading activities, micro-cap stocks are often overlooked
            or not closely followed by investors. Therefore, a micro-cap
            company's growth potential may not be reflected in its stock price.
            The Micro-Cap Value Fund will invest in companies that appear to
            have good prospects for improvement in earnings trends or asset
            values, or other positive attributes which should affect future
            earnings and which we believe are important factors determining the
            future market valuation of stocks.

      Both funds evaluate companies based on an analysis of the company's
      financial statements, interviews with management, analysis of market
      sectors and analysis of the micro-cap company's products and operations.

      We attempt to manage risk by diversifying each fund's investments among a
      large number of micro-cap companies across a wide range of industries. In
      addition, each fund may use a variety of investment techniques, such as
      hedging or engaging in certain derivative transactions, to manage
      investment risks.

We or the fund refers to either of the Micro-Cap Growth Fund (the "Micro-Cap
Growth Fund") or the Micro-Cap Value Fund (the "Micro-Cap Value Fund") of Lord
Abbett Securities Trust, Inc. (the "company"). Each fund operates under the
supervision of the company's Board with the advice of Lord, Abbett & Co. ("Lord
Abbett"), its investment manager.

About each fund. Each fund is a professionally managed portfolio of securities
purchased with the pooled money of investors. Each fund strives to reach its
stated goals, although as with all mutual funds, cannot guarantee results.

Micro-cap companies represent the smallest sector of companies based on market
capitalization. In these funds, companies will have no more than $350 million in
market capitalization at the time of purchase. Normally, micro-cap companies are
in their earliest stages of development and may offer unique products, services
or technologies or may serve special or rapidly expanding niches. Micro-cap
companies tend to have less predictable earnings and less liquid securities than
more established companies.

You should read this entire prospectus, including "Other Investment Techniques,"
which concisely describes the other investment strategies and their risks used
by the fund.


2  The Funds


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                                                          Micro-Cap Growth Fund
                                                          Micro-Cap Value Fund
MAIN RISKS

      There can be no assurance that the funds will appreciate in value.

      Stocks of the smaller companies in which the funds invest may provide
      greater opportunities for capital appreciation, but may be more volatile
      than stocks of larger companies. In addition, micro-cap companies also
      involve greater risk and should be considered speculative as compared with
      investments in larger companies. Investors in the funds should be willing
      to assume the greater risks of short-term price fluctuations typical in
      funds focusing on micro-cap stocks. Also, it may take a substantial period
      of time before the funds realize a gain on an investment in a micro-cap
      company, if they realize any gain at all.

      Micro-cap companies may have limited product lines or markets for their
      products, limited access to financial resources and less depth in
      management skill than larger, more established companies. Many micro-cap
      stocks are traded over-the-counter including those listed on the National
      Market System portion of the NASDAQ quotation system and are not traded in
      the volume typical of stocks listed on a national securities exchange.
      Micro-cap stocks therefore may be less liquid than those of larger
      issuers. That means the funds could have greater difficulty selling a
      security of a micro-cap issuer at an acceptable price, especially in
      periods of market volatility. That could increase the potential for loss
      to the funds.

      The foreign securities in which the funds may invest are subject to
      currency fluctuations. Foreign securities markets may not be subject to
      the same degree of regulation as the U.S. markets and may be more volatile
      and less liquid than the U.S. markets.

      An investment in either fund is not a bank deposit. It is not FDIC-insured
      or government endorsed. It is not a complete investment program. You could
      lose money in these funds, but you also have the potential to make money.

Over-the-counter stocks are usually those of smaller companies that are not
listed on major exchanges because they do not meet listing requirements set by
such exchanges or for other reasons. Transactions are conducted by telephone and
computer network rather than on the floor of an exchange.


                                                                    The Funds  3


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                                                           Micro-Cap Growth Fund
FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund.

================================================================================
Fee table
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                Class Y
<S>                                                              <C>
Shareholder Fees (Fees paid directly from your investment)
- --------------------------------------------------------------------------------
Maximum Sales Charge on Purchases (as a % of offering price)     none
- --------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")                  none
- --------------------------------------------------------------------------------
Annual Fund Operating Expenses (Expenses deducted from fund assets) (as a % of
average net assets)
- --------------------------------------------------------------------------------
Management Fees (See "Management")                              %
- --------------------------------------------------------------------------------
Other Expenses (See "Management")                               %
- --------------------------------------------------------------------------------
Total Operating Expenses                                        %
- --------------------------------------------------------------------------------
</TABLE>

================================================================================
Expense example
- --------------------------------------------------------------------------------

This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment, 5% total return each year and no changes in expenses. You pay the
following expenses over the course of each period shown if you sell your shares
at the end of the period, although your actual cost may be higher or lower. You
also would pay the same expenses, assuming you kept your shares.

<TABLE>
<CAPTION>
Share class                                    1 Year               3 Years
<S>                                              <C>                   <C>
Class Y shares                                   $                     $
- --------------------------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.

Management fees are payable to Lord Abbett for the fund's invest-ment
management.

Other expenses include fees paid for miscellaneous items such as transfer
agency, legal and share registration fees.

                                                            Micro-Cap Value Fund
FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund.

================================================================================
Fee table
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                Class Y
<S>                                                              <C>
Shareholder Fees (Fees paid directly from your investment)
- --------------------------------------------------------------------------------
Maximum Sales Charge on Purchases (as a % of offering price)     none
- --------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")                  none
- --------------------------------------------------------------------------------
Annual Fund Operating Expenses (Expenses deducted from fund assets) (as a % of
average net assets)
- --------------------------------------------------------------------------------
Management Fees (See "Management")                               %
- --------------------------------------------------------------------------------
Other Expenses (See "Management")                                %
- --------------------------------------------------------------------------------
Total Operating Expenses                                         %
- --------------------------------------------------------------------------------
</TABLE>

================================================================================
Expense example
- --------------------------------------------------------------------------------

This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment, 5% total return each year and no changes in expenses. You pay the
following expenses over the course of each period shown if you sell your shares
at the end of the period, although your actual cost may be higher or lower. You
also would pay the same expenses, assuming you kept your shares.

<TABLE>
<CAPTION>
Share class                                    1 Year               3 Years
<S>                                              <C>                   <C>
Class Y shares                                   $                     $
- --------------------------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.


4  The Funds


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                                Your Investment

PURCHASES

      Class Y shares. Class Y shares are purchased at net asset value ("NAV")
      with no sales charge of any kind. The NAV of our shares is calculated
      every business day as of the close of the New York Stock Exchange. Our
      shares are continuously offered. The offering price is based on NAV per
      share next determined after we receive your order submitted in proper
      form. We reserve the right to withdraw all or part of the offering made by
      this prospectus, or to reject any purchase order. We also reserve the
      right to waive or change minimum investment requirements. All purchase
      orders are subject to our acceptance and are not binding until confirmed
      or accepted in writing.

      Who May Invest? Eligible purchasers of Class Y shares include: (1) certain
      authorized brokers, dealers, registered investment advisers or other
      financial institutions who either (a) have an arrangement with Lord Abbett
      Distributor in accordance with certain standards approved by Lord Abbett
      Distributor, providing specifically for the use of our Class Y shares in
      particular investment products made available for a fee to clients of such
      brokers, dealers, registered investment advisers or other financial
      institutions, or (b) charge an advisory consulting or other fee for their
      services and buy shares for their own accounts or the accounts of their
      clients ("Mutual Fund Advisory Programs"), (2) the trustee or custodian
      under any deferred compensation or pension or profit-sharing plan or
      payroll deduction IRA established for the benefit of the employees of any
      company with an account(s) in excess of $10 million managed by Lord Abbett
      or its sub-advisors on a private-advisory-account basis, and (3)
      institutional investors, including retirement plans, companies,
      foundations, trusts, endowments and other entities where the total amount
      of potential investable assets exceeds $50 million that were not
      introduced to Lord Abbett by persons associated with a broker or dealer
      primarily involved in the retail security business. Additional payments
      may be made by Lord Abbett out of its own resources with respect to
      certain of these sales.

      How Much Must You Invest? You may buy our shares through any independent
      securities dealer having a sales agreement with Lord Abbett Distributor,
      our exclusive selling agent. Place your order with your investment dealer
      or send the money to the fund you selected (P.O. Box 419100, Kansas City,
      Missouri 64141). The minimum initial investment is $1 million except for
      Mutual Fund Advisory Programs which have no minimum. This offering may be
      suspended, changed or withdrawn by Lord Abbett Distributor which reserves
      the right to reject any order.

      Buying Shares Through Your Dealer. Orders for shares received by a fund
      prior to the close of the NYSE, or received by dealers prior to such close
      and received by Lord Abbett Distributor prior to the close of its business
      day, will be confirmed at NAV effective at such NYSE close. Orders
      received by dealers after the NYSE closes and received by Lord Abbett
      Distributor in proper form prior to the close of its next business day are
      executed at the NAV effective as of the close of the NYSE on that next
      business day. The dealer is responsible for the timely transmission of
      orders to Lord Abbett Distributor. A business day is a day on which the
      NYSE is open for trading.

NAV per share is calculated each business day at the close of regular trading on
the New York Stock Exchange ("NYSE"). Each fund is open on those business days
when the NYSE is open. Purchases and sales of fund shares are executed at the
NAV next determined after the fund receives your order. In calculating NAV,
securities for which market quotations are available are valued at those
quotations. Securities for which such quotations are not available are valued at
fair value under procedures approved by the Board.

Lord Abbett Distributor LLC ("Lord Abbett Distributor") acts as agent for the
funds to work with investment professionals that buy and/or sell shares of the
funds on behalf of their clients. Generally, Lord Abbett Distributor does not
sell fund shares directly to investors.


                                                              Your Investment  5


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      Buying Shares By Wire. To open an account, call 800-821-5129 Ext. 34028,
      Institutional Trade Dept., to set up your account and to arrange a wire
      transaction. Wire to: United Missouri Bank of Kansas City, N.A., Routing
      number - 101000695, bank account number: 9878002611, FBO: (account name)
      and (your Lord Abbett account number). Specify the complete name of the
      fund of your choice, note Class Y shares and include your new account
      number and your name. To add to an existing account, wire to: United
      Missouri Bank of Kansas City, N.A., routing number - 101000695, bank
      account number: 9878002611, FBO: (account name) and (your Lord Abbett
      account number). Specify the complete name of the fund of your choice,
      note Class Y shares and include your account number and your name.

REDEMPTIONS

      By Broker. Call your investment professional for directions on how to
      redeem your shares.

      By Telephone. To obtain the proceeds of a redemption of $50,000 or less
      from your account, you or your representative can call the fund at
      800-821-5129.

      By Mail. Submit a written redemption request indicating, the name(s) in
      which the account is registered, the fund's name, the class of shares,
      your account number, and the dollar value or number of shares you wish to
      sell.

      Include all necessary signatures. If the signer has any Legal Capacity,
      the signature and capacity must be guaranteed by an Eligible Guarantor.
      Certain other legal documentation may be required. For more information
      regarding proper documentation call 800-821-5129.

      Normally a check will be mailed to the name and address in which the
      account is registered (or otherwise according to your instruction) within
      three business days after receipt of your redemption request. Your account
      balance must be sufficient to cover the amount being redeemed or your
      redemption order will not be processed. Redemption requests for shares
      initially purchased by check will not be honored for up to 15 days, unless
      we are assured that the check has cleared earlier.

      By Wire. In order to receive funds by wire, our servicing agent must have
      the wiring instructions on file. To verify that this feature is in place,
      call 800-821-5129 Ext. 34028, Institutional Trading Dept. Minimum wire:
      $1,000. Your wire redemption request must be received by your fund before
      the close of the NYSE for money to be wired on the next business day.

DISTRIBUTIONS AND TAXES

      Each fund pays its shareholders dividends from its net investment income,
      and distributes net capital gains that it has realized. Dividends from net
      investment income are expected to be paid to shareholders of Micro-Cap
      Value Fund semi-annually and Micro-Cap Growth Fund annually. If a capital
      gains distribution is declared, it is expected to be paid annually. Your
      distributions will be reinvested in your fund unless you instruct the fund
      to pay them to you in cash. There are no sales charges on reinvestments.

Important Information. You may be subject to a $50 penalty under the Internal
Revenue Code if you do not provide a correct taxpayer identification number
(Social Security Number for individuals) or make certain required
certifications. In addition, we may be required to withhold from your account
and pay to the U.S. Treasury 31% of any redemption proceeds and any dividend or
distribution from your account.

Eligible Guarantor is any broker or bank that is a member of the Medallion Stamp
Program. Most major securities firms and banks are members of this program. A
notary public is not an eligible guarantor.

Taxes on Transactions. The chart at left also can provide a "rule of thumb"
guide for your potential U.S. federal income tax liability when selling or
exchanging fund shares. The second row, "Short-term capital gains," applies to
fund shares sold within 12 months of purchase. The third row, "Long-term capital
gains," applies to shares held for more than 12 months.

Starting January 1, 2001, sales of securities held for more than five years will
be taxed at special lower rates.


6  Your Investment


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<PAGE>

      The tax status of any distribution is the same for all shareholders
      regardless of how long they have been in the fund or whether distributions
      are reinvested or paid in cash. In general, distributions are taxable as
      follows:

================================================================================
Federal Taxability Of Distributions

<TABLE>
<CAPTION>
Type of               Tax rate for            Tax rate for
distribution          15% bracket             28% bracket and above
- --------------------------------------------------------------------------------
<S>                   <C>                     <C>
Income                Ordinary Income         Ordinary Income
dividends             Rate                    Rate
- --------------------------------------------------------------------------------
Short-term            Ordinary Income         Ordinary Income
capital gains         Rate                    Rate
- --------------------------------------------------------------------------------
Long-term
capital gains         10%                     20%
- --------------------------------------------------------------------------------
</TABLE>

      Except in tax-advantaged accounts, any sale or exchange of fund shares may
      be a taxable event.

      Annual Information - Information concerning the tax treatment of dividends
      and other distributions will be mailed to shareholders each year. Each
      fund will also provide annually to its shareholders information regarding
      the source of dividends and distributions of capital gains by that fund.
      Because everyone's tax situation is unique, you should consult your tax
      adviser regarding the treatment of those distributions under the federal,
      state and local tax rules that apply to you as well as the tax
      consequences of gains or losses from the redemption or exchange of your
      shares.

SERVICES FOR FUND INVESTORS

AUTOMATIC SERVICES

      We offer the following shareholder services:

      Telephone Exchange Privilege. Class Y shares may be exchanged without a
      service charge for Class Y shares of any Eligible Fund among the Lord
      Abbett-sponsored funds.

      Account Statements. Every Lord Abbett investor automatically receives
      quarterly account statements.

      Householding. Shareholders with the same last name and address will
      receive a single copy of a prospectus and an annual or semi-annual report,
      unless additional reports are specifically requested in writing to the
      funds. 

      Account Changes. For any changes you need to make to your account, consult
      your investment professional or call the fund at 800-821-5129.

      Systematic Exchange. You or your investment professional can establish a
      schedule of exchanges between the same classes of any Eligible Fund.

Telephone Transactions. You have this privilege unless you refuse it in writing.
For your security, telephone transaction requests are recorded. We will take
measures to verify the identity of the caller, such as asking for your name,
account number, social security or taxpayer identification number and other
relevant information. Each fund will not be liable for following instructions
communicated by telephone that it reasonably believes to be genuine.

Transactions by telephone may be difficult to implement in times of drastic
economic or market change.

Exchanges by telephone should not be used to take advantage of short-term swings
in the market. Each fund reserves the right to limit or terminate this privilege
for any shareholder making frequent exchanges or abusing the privilege and may
revoke the privilege for all shareholders upon 60 days' written notice.


                                                              Your Investment  7


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MANAGEMENT

      The funds' investment adviser is Lord, Abbett & Co., 767 Fifth Avenue, New
      York, NY 10153-0203. Founded in 1929, Lord Abbett manages one of the
      nation's oldest mutual fund complexes, with over $30 billion in more than
      35 mutual fund portfolios and other advisory accounts. For more
      information about the services Lord Abbett provides to the funds, see the
      Statement of Additional Information.

      Each fund pays Lord Abbett a monthly fee at the annual rate of 1.5% of
      such funds average daily net assets. In addition each fund pays all
      expenses not expressly assumed by Lord Abbett.

      Lord Abbett uses a team of portfolio managers and analysts acting together
      to manage each fund's investments.

      Micro-Cap Growth Fund. Stephen McGruder, Partner of Lord Abbett, heads the
      fund's team, the other senior members of which are Lesley-Jane Dixon,
      Rayna Lesser and Cinda Hughes. Mr. McGruder and Ms. Dixon have been with
      Lord Abbett since 1995, Ms. Lesser has been with Lord Abbett since 1996
      and Ms. Hughes since 1998. Before joining Lord Abbett, Mr. McGruder was a
      portfolio manager and Ms. Dixon was an equity analyst with Wafra
      Investment Advisory Group. Ms. Lesser joined Lord Abbett directly from
      Barnard College. Ms. Hughes was an Analyst/Director of Equity Research at
      Phoenix Investment Counsel and an Associate Strategist at Paine Webber,
      Inc./Kidder, Peabody & Co. before joining Lord Abbett.

      Micro-Cap Value Fund. Robert P. Fetch, Partner of Lord Abbett, heads the
      fund's team, the other senior members of which are Gregory M. Macosko and
      Gerard S.E. Heffernan, Jr. Mr. Fetch joined Lord Abbett in 1995; before
      that, he was was a Managing Director of Prudential Investment Advisors
      from 1983 to 1995. Mr. Macosko joined Lord Abbett in 1996; before that he
      was an Equity Analyst with Quest Advisory Service from 1991 to 1996. Mr.
      Heffernan joined Lord Abbett in 1998; before that he was with CL Capital
      Management Company as a Portfolio Manager from 1996 to 1998 and as an
      Equity Research Analyst from 1992 to 1996.


8  Your Investment


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                              For More Information

OTHER INVESTMENT TECHNIQUES

      This section describes some of the investment techniques that might be
      used by the funds, and their risks.

      Adjusting Investment Exposure. Each fund may, but is not required to, use
      various strategies to change its investment exposure to adjust to changing
      security prices, interest rates, currency exchange rates, commodity prices
      and other factors. Each fund may use these transactions to change the risk
      and return characteristics of each fund's portfolio. If we judge market
      conditions incorrectly or use a strategy that does not correlate well with
      a fund's investments, it could result in a loss, even if we intended to
      lessen risk or enhance returns. These transactions may involve a small
      investment of cash compared to the magnitude of the risk assumed and could
      produce disproportionate gains or losses. Also, these strategies could
      result in losses if the counterparty to a transaction does not perform as
      promised.

      Borrowing. Each fund may borrow from banks. If a fund borrows money, its
      share price may be subject to greater fluctuation until the borrowing is
      paid off. Each fund may borrow only for temporary or emergency purposes,
      and not in an amount exceeding 33 1/3% of its total assets.

      Closed-End Investment Companies. The Micro-Cap Value Fund fund may invest
      in shares of closed-end investment companies if it pays a fee or
      commission no greater than the customary broker's commission. Shares of
      investment companies sometimes trade at a discount or premium to their net
      asset value. Also, there may be duplication of fees if a fund and the
      closed-end investment company both charge a management fee. No more than
      5% of the fund's gross assets may be invested in Closed-End Investment
      Companies.

      Diversification. Each fund is a diversified fund, which means that with
      respect to 75% of its total assets, it will not purchase a security if, as
      a result, more than 5% of the fund's total assets would be invested in
      securities of a single issuer or the fund would hold more than 10% of the
      outstanding voting securities of the issuer. U.S. government securities
      are not subject to these requirements.

      Financial Futures Transactions. The Micro-Cap Value Fund may enter into
      financial futures transactions. A financial futures transaction is the
      purchase or sale of an exchange-traded contract to buy or sell a standard
      quality and quantity of a financial instrument or index at a specific
      future date and price. The price behavior of the futures contract may not
      correlate with that of the item being hedged. The fund will not enter into
      any futures contracts, or options thereon, if the aggregate market value
      of the securities covered by futures contracts plus options on such
      financial futures exceeds 50% of its total assets.

      Foreign Currency Hedging Techniques. Both funds may use foreign currency
      hedging techniques. Although the funds do not normally engage in extensive
      currency hedging, they may use forward foreign currency contracts and
      options thereon to hedge the risk to the portfolio if they expect that
      foreign exchange price movements will be unfavorable for U.S. investors.
      Generally, these instruments allow a fund to lock in a specified exchange
      rate for a period of time. If the fund's forecast proves to be wrong, such
      a hedge may cause a loss. Also, it may be difficult or impractical to
      hedge currency risk in many emerging countries. Although such contracts
      will be used primarily to protect the fund 


                                                         For More Information  9


<PAGE>

<PAGE>

      from adverse currency movements, their use involves the risk that Lord
      Abbett will not accurately predict currency movement, and the fund's
      return could be reduced.

      Certain of the funds' investments may be denominated in foreign currency.
      The funds use currency transactions in an attempt to eliminate currency
      risk associated with foreign investments.

      The Micro-Cap Growth Fund may also purchase foreign currency put and call
      options, subject to certain limitations.

      There is the possibility that the foreign currency hedging techniques will
      not work as anticipated.

      Foreign Securities. Each fund may invest up to 10% of its total assets in
      foreign securities. These securities are not subject to the same degree of
      regulation and may be more volatile and less liquid than securities traded
      in major U.S. markets. Foreign portfolio securities may trade on days when
      a fund does not value them. Fund share prices could be affected on days an
      investor cannot purchase or sell shares. Other risks include less
      information on public companies, banks, and governments; political and
      social instability; expropriations; higher transaction costs; currency
      fluctuations; non-deductible withholding taxes and different accounting
      and settlement practices.

      Illiquid Securities. Each fund may invest in illiquid securities. These
      securities include those that are not traded on the open market or that
      trade irregularly or in very low volume. They may be difficult or
      impossible to sell at the time and price the fund would like. Each fund
      may invest up to 15% of its assets in illiquid securities. Some securities
      of micro-cap companies may be restricted as to resale or may be highly
      illiquid.

      Options Transactions. The Micro-Cap Growth Fund and Micro-Cap Value Fund
      may only sell (write) covered call options. This means that they may only
      sell the call options on securities that they own. The Micro-Cap Growth
      Fund may buy and write put and call options on equity securities or stock
      indices that are traded on national securities exchanges. A put option on
      securities gives the buyer, in return for a premium, the right, for a
      specified period of time, to sell the securities subject to the option to
      the writer (seller) of the put at the specified exercise price. The writer
      of the put option, in return for the premium, has the obligation, upon
      exercise of the option, to acquire the securities underlying the option at
      the exercise price. The writer of a put option might become obligated to
      purchase underlying securities for more than their current market value.

      A call option on securities gives the buyer, in return for a premium paid,
      the right for a specified period of time to buy the securities subject to
      the option at a specified price (the "exercise price" or "strike price").
      The writer of a call option, in return for the premium, has the
      obligation, upon exercise of the option, to deliver, depending upon the
      terms of the option contract, the underlying securities to the buyer upon
      receipt of the exercise price..

      When a fund writes a call option, it gives up the potential for gain on
      the underlying securities in excess of the exercise price of the option
      during the period that the option is open.

      Options on stock indices are similar to options on equity securities
      except that, rather than the right to take or make delivery of stock at a
      specified price, an option on a stock index gives the holder the right, in
      return for a premium paid, to receive, upon exercise


10 For More Information


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      of the option, an amount of cash if the closing level of the stock index
      upon which the option is based is greater than, in the case of a call, or
      less than, in the case of a put, the exercise price of the option. The
      writer of an index option, in return for a premium, is obligated to pay
      the amount of cash due upon exercise of the option.

      The Micro-Cap Growth Fund may write only covered put options to the extent
      that cover for such options does not exceed 25% of the fund's net assets.
      The fund will not buy an option if, as a result of such purchase, more
      than 20% of its total assets would be invested in premiums for such
      options.

      Portfolio Securities Lending. Each fund may lend securities to
      broker-dealers and financial institutions, as a means of earning income.
      This practice could result in a loss or delay in recovering each fund's
      securities, if the borrower defaults. Each fund will limit its securities
      loans to 30% of its total assets and all loans will be fully
      collateralized.

      Repurchase Agreements. Each fund may enter into repurchase agreements. In
      a repurchase agreement, a fund buys a security at one price from a
      broker-dealer or financial institution and simultaneously agrees to sell
      the same security back to the same party at a higher price in the future.
      If the other party to the agreement defaults or becomes insolvent, a fund
      could lose money.

      Rights and Warrants. Each fund may invest up to 5% of its assets in rights
      and warrants to purchase securities. Rights represent a privilege offered
      to holders of record of issued securities (usually on a pro-rata basis)
      for additional securities of the same class, or of a different class, or
      of a different issuer, as the case may be. Warrants represent the
      privilege to purchase securities at a stipulated price and are usually
      valid for several years. Rights and warrants generally do not entitle a
      holder to dividends or voting rights with respect to the underlying
      securities, nor do they represent any rights in the assets of the issuing
      company.

      The value of a right or warrant may not necessarily change with the value
      of the underlying securities and rights and warrants cease to have value
      after their expiration date.

      Rule 144A Securities. Both funds may invest in Rule 144A securities, which
      are securities determined by the Board to be liquid pursuant to Securities
      and Exchange Commission Rule 144A (the "Rule"). Under the Rule, a
      qualifying unregistered security may be resold to a qualified
      institutional buyer without registration and without regard to whether the
      seller originally purchased the security for investment. Investments in
      Rule 144A securities initially determined to be liquid could have the
      effect of diminishing the level of a fund's liquidity during periods of
      decreased market interest in such securities.

      Stock Index Futures. The Micro-Cap Value Fund may invest in stock index
      futures. A stock index futures contract is an agreement in which one party
      agrees to deliver to another an amount of cash equal to a specific dollar
      amount times the difference between a specific stock index at the close of
      the last trading day of the contract and the price at which the agreement
      is made. No physical delivery of the underlying stocks in the index is
      made.

      Participation in the options or futures markets involves investment risks
      and transaction costs to which the Micro-Cap Value Fund would not be
      subject absent the use of these strategies. If the Micro-Cap Value Fund
      management's prediction of movement in the direction of the securities
      markets is inaccurate, the adverse consequences to the fund may leave it
      in a worse position than if such strategies were not used. Risks inherent
      in the use of options and stock index futures include: (1) dependence on
      management's ability to 


                                                        For More Information  11


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      predict correctly movements in the direction of specific securities being
      hedged or the movement in stock indices; (2) imperfect correlation between
      the price of options and stock index futures and options thereon and
      movements in the prices of the securities being hedged; (3) the fact that
      skills needed to use these strategies are different from those needed to
      select portfolio securities; (4) the possible absence of a liquid
      secondary market for any particular instrument at any time; (5) the
      possible need to defer closing out certain hedged positions to avoid
      adverse tax consequences; and (6) daily limits on price variance for a
      futures contract or related options imposed by certain futures exchanges
      and boards of trade may restrict transactions in such securities on a
      particular day.

      The Micro-Cap Value Fund may not purchase or sell stock index futures if,
      immediately after a purchase or sale, more than one-third of its net
      assets would be hedged. In addition, except in the case of a call written
      and held on the same index, the Micro-Cap Value Fund will write call
      options on indices or sell stock index futures only if the amount
      resulting from the multiplication of the then current level of the index
      (or indices) upon which the options or futures contract(s) is based, the
      applicable multiplier(s), and the number of futures or options contracts
      which would be outstanding would not exceed one-third of the value of the
      Micro-Cap Value Fund's net assets.

      The Micro-Cap Value Fund's ability to enter into stock index futures and
      listed options is limited by certain tax requirements in order to qualify
      as a regulated investment company.

      Short Sales. The Micro-Cap Value Fund may make short sales of securities
      or maintain a short position, if at all times when a short position is
      open the fund owns an equal amount of such securities or securities
      convertible into or exchangeable, without payment of any further
      consideration, for an equal amount of the securities of the same issuer as
      the securities sold short. The Micro-Cap Value Fund does not intend to
      have more than 5% of its net assets (determined at the time of the short
      sale) subject to short sales against the box.

      When-Issued or Delayed Delivery Securities. The Micro-Cap Value Fund may
      purchase or sell securities with payment and delivery taking place as much
      as a month or more later. The fund would do this in an effort to buy or
      sell the securities at an advantageous price and yield. The securities
      involved are subject to market fluctuation and no interest accrues to the
      purchaser during the period between purchase and settlement. At the time
      of delivery of the securities, their market value may be less than the
      purchase price. Also, if the fund commits a significant amount of assets
      to when-issued or delayed delivery transactions, it may increase the
      volatility of its net asset value.


12  For More Information


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GLOSSARY OF SHADED TERMS

      Eligible Fund. An Eligible Fund is any Lord Abbett-sponsored fund offering
      class Y shares.

      Legal Capacity. This term refers to the authority of an individual to act
      on behalf of an entity or other person(s). For example, if a redemption
      request were to be made on behalf of the estate of a deceased shareholder,
      John W. Doe, by a person (Robert A. Doe) who has the legal capacity to act
      for the estate of the deceased shareholder because he is the executor of
      the estate, then the request must be executed as follows: Robert A. Doe,
      Executor of the Estate of John W. Doe. That signature using that capacity
      must be by an Eligible Guarantor.

      To give another example, if a redemption request were to be made on behalf
      of the ABC Corporation by a person (Mary B. Doe) who has the legal
      capacity to act on behalf of the Corporation, because she is the president
      of the Corporation, the request must be executed as follows: ABC
      Corporation by Mary B. Doe, President. That signature using that capacity
      must be guaranteed by an Eligible Guarantor (see example in right column).

      Mutual Fund Advisory Program. Certain unaffiliated authorized brokers,
      dealers, registered investment advisers or other financial institutions
      who either (a) have an arrangement with Lord Abbett Distributor in
      accordance with certain standards approved by Lord Abbett Distributor,
      providing specifically for the use of our shares (and sometimes providing
      for acceptance of orders for such shares on our behalf) in particular
      investment products made available for a fee to clients of such brokers,
      dealers, registered investment advisers and other financial institutions,
      or (b) charge an advisory, consulting or other fee for their services and
      buy shares for their own accounts or the accounts of their clients.

Guaranteed signature. An acceptable form of guarantee would be as follows:

     In the case of the estate -

        Robert A. Doe
        Executor of the Estate of
        John W. Doe
 
        [Date]

             SIGNATURE GUARANTEED
             MEDALLION GUARANTEED
               NAME OF GUARANTOR

              /s/ David R. Levy
- ------------------------------------------------
                            AUTHORIZED SIGNATURE

(960)                                   X9003470

SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                              SR


     In the case of the corporation -

      ABC Corporation

      Mary B. Doe

      By Mary B. Doe, President

      [Date]

             SIGNATURE GUARANTEED
             MEDALLION GUARANTEED
               NAME OF GUARANTOR

              /s/ David R. Levy
- ------------------------------------------------
                            AUTHORIZED SIGNATURE

(960)                                   X9003470

SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                              SR

Year 2000 Issues. Each fund could be adversely affected if the computers used by
each fund and their service providers do not properly process and calculate
date-related information from and after January 1, 2000. 

Lord Abbett is working to avoid such problems and has received assurances from
each fund's service providers that they are taking similar steps. Of course, the
Year 2000 problem is unprecedented and, therefore, Lord Abbett cannot eliminate
altogether the possibility that it or the fund will be affected.


                                                        For More Information  13


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      More information on these funds is available free upon request, including:

ANNUAL/SEMI-ANNUAL REPORT

      Describes the funds, lists portfolio holdings and contains a letter from
      the funds' manager discussing recent market conditions and the funds'
      investment strategies.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

      Provides more details about the funds and their policies. A current SAI is
      on file with the Securities and Exchange Commission ("SEC") and is
      incorporated by reference (is legally considered part of this prospectus).

      Lord Abbett Micro-Cap Growth Fund
      Lord Abbett Micro-Cap Value Fund

      The General Motors Building
      767 Fifth Avenue
      New York, NY 10153-0203
      -------------------------
      SEC file number: 811-7358

To obtain information:

By telephone.  Call the funds at:
800-426-1130

By mail.  Write to the funds at:
The Lord Abbett Family of Funds
767 Fifth Avenue
New York, NY 10153-0203

Via the Internet.
Lord, Abbett & Co.
http://www.lordabbett.com 

Text only versions of fund documents can be viewed online or downloaded from:

SEC
http://www.sec.gov

You can also obtain copies by visiting the SEC's Public Reference Room in
Washington, DC (phone 800-SEC-0330) or by sending your request and a duplicating
fee to the SEC's Public Reference Section, Washington, DC 20549-6009.

LA?-1-699
(6/99)


<PAGE>

<PAGE>

LORD ABBETT

Statement of Additional Information                                   DATE, 1999

                          LORD ABBETT SECURITIES TRUST
                        Lord Abbett Micro-Cap Growth Fund
                        Lord Abbett Micro-Cap Value Fund

This Statement of Additional Information is not a Prospectus. A Prospectus may
be obtained from your securities dealer or from Lord Abbett Distributor LLC
("Lord Abbett Distributor") at The General Motors Building, 767 Fifth Avenue,
New York, New York 10153-0203. This Statement of Additional Information relates
to, and should be read in conjunction with, the Prospectus dated (DATE), 1999.

Lord Abbett Securities Trust (the "Company") was organized as a Delaware
business trust on February 26, 1993. The Company has six funds, but only Lord
Abbett Micro-Cap Growth Fund and Lord Abbett Micro-Cap Value Fund , both of
which offer only one class of shares: Class Y, which are described in this
Statement of Additional Information. All shares have equal noncumulative voting
rights and equal rights with respect to dividends, assets and liquidation,
except for certain class-specific expenses. They are fully paid and
nonassessable when issued and have no preemptive or conversion rights.

Rule 18f-2 under the Act provides that any matter required to be submitted, by
the provisions of the Act or applicable state law, or otherwise, to the holders
of the outstanding voting securities of an investment company such as the
Company shall not be deemed to have been effectively acted upon unless approved
by the holders of a majority of the outstanding shares of each class affected by
such matter. Rule 18f-2 further provides that a class shall be deemed to be
affected by a matter unless the interests of each class or fund in the matter
are substantially identical or the matter does not affect any interest of such
class or fund.

Shareholder inquiries should be made by directly contacting the Funds or by
calling 800-821-5129. In addition, you can make inquiries through your dealer.

<TABLE>
<CAPTION>
                        TABLE OF CONTENTS                        PAGE
<S>                     <C>                                        <C>
                 1.     Investment Policies                         2
                 2.     Trustees and Officers                      10
                 3.     Investment Advisory and Other Services     13
                 4.     Portfolio Transactions                     13
                 5.     Purchases, Redemptions
                        and Shareholder Services                   15
                 6.     Performance                                16
                 7.     Taxes                                      16
                 8.     Information About The Company              18
                 9.     Financial Statements                       18
</TABLE>


                                       1


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                                       1.

                               Investment Policies

Fundamental Investment Restrictions. Each Fund is subject to the following
fundamental investment restrictions, which cannot be changed without approval of
a majority of a Fund's respective outstanding shares.

Each Fund may not: (1) borrow money, except that (i) each Fund may borrow from
banks (as defined in the Act) in amounts up to 33 1/3% of its total assets
(including the amount borrowed), (ii) each Fund may borrow up to an additional
5% of its total assets for temporary purposes, (iii) each Fund may obtain such
short-term credit as may be necessary for the clearance of purchases and sales
of portfolio securities and (iv) each Fund may purchase securities on margin to
the extent permitted by applicable law; (2) pledge its assets (other than to
secure borrowings, or to the extent permitted by the Funds' investment policies
as permitted by applicable law); (3) engage in the underwriting of securities,
except pursuant to a merger or acquisition or to the extent that, in connection
with the disposition of its portfolio securities, it may be deemed to be an
underwriter under federal securities laws; (4) make loans to other persons,
except that the acquisition of bonds, debentures or other corporate debt
securities and investment in government obligations, commercial paper,
pass-through instruments, certificates of deposit, bankers acceptances,
repurchase agreements or any similar instruments shall not be subject to this
limitation, and except further that each Fund may lend its portfolio securities,
provided that the lending of portfolio securities may be made only in accordance
with applicable law; (5) buy or sell real estate (except that each Fund may
invest in securities directly or indirectly secured by real estate or interests
therein or issued by companies which invest in real estate or interests therein)
or commodities or commodity contracts (except to the extent each Fund may do so
in accordance with applicable law and without registering as a commodity pool
operator under the Commodity Exchange Act as, for example, with futures
contracts); (6) with respect to 75% of the gross assets of each Fund, buy
securities of one issuer representing more than (i) 5% of each Fund's gross
assets, except securities issued or guaranteed by the U.S. Government, its
agencies or instrumentalities or (ii) own more than 10% of the voting securities
of such issuer; (7) invest more than 25% of its assets, taken at market value,
in the securities of issuers in any particular industry (excluding securities of
the U.S. Government, its agencies and instrumentalities); or (8) issue senior
securities to the extent such issuance would violate applicable law.

With respect to the restrictions mentioned herein, compliance therewith will not
be affected by change in the market value of portfolio securities but will be
determined at the time of purchase or sale of such securities.

Non-Fundamental Investment Restrictions. In addition to policies in the
Prospectus and the investment restrictions above which cannot be changed without
shareholder approval, each fund is also subject to the following non-fundamental
investment policies which may be changed by the Board of Directors without
shareholder approval. Each Fund may not: (1) borrow in excess of 33 1/3% of its
total assets (including the amount borrowed), and then only as a temporary
measure for extraordinary or emergency purposes; (2) make short sales of
securities or maintain a short position except to the extent permitted by
applicable law; (3) invest knowingly more than 15% of its net assets (at the
time of investment) in illiquid securities, except for securities qualifying for
resale under Rule 144A of the Securities Act of 1933 ("Rule 144A"), deemed to be
liquid by the Board of Directors; (4) invest in the securities of other
investment companies as defined in the Act, except as permitted by applicable
law; (5) invest in securities of issuers which, with their predecessors, have a
record of less than three years' continuous operation, if more than 5% of each
Fund's total assets would be invested in such securities (this restriction shall
not apply to mortgaged-backed securities, asset-backed securities or obligations
issued or guaranteed by the U. S. Government, its agencies or
instrumentalities); (6) hold securities of any issuer if more than 1/2 of 1% of
the securities of such issuer are owned beneficially by one or more of the
officers or directors of the Funds or by one or more partners or members of the
Funds' underwriter or investment adviser if these owners in the aggregate own
beneficially more than 5% of the securities of such issuer; (7) invest in
warrants if, at the time of the acquisition, its investment in warrants, valued
at the lower of cost or market, would exceed 5% of each Fund's total assets
(included within such limitation, but not to exceed 2% of each Fund's total
assets, are warrants which are not listed on the New York or American Stock
Exchange or a foreign exchange); (8) invest in real estate limited partnership
interests or interests in oil, gas or other mineral leases, or exploration or
development programs, except that each Fund may invest in securities issued by
companies that engage in oil, gas or other mineral exploration or 


                                       2


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development activities; (9) write, purchase or sell puts, calls, straddles,
spreads or combinations thereof, except to the extent permitted in the Funds'
prospectuses and statements of additional information, as they may be amended
from time to time; or (10) buy from or sell to any of the Funds' officers,
directors, employees, or its investment adviser or any of the Funds' officers,
directors, partners or employees, any securities other than shares of the Funds'
common stock.

INVESTMENT TECHNIQUES

Lending Of Portfolio Securities. Although each Fund has no current intention of
doing so, each may seek to earn income by lending portfolio securities. Under
present regulatory policies, such loans may be made to member firms of the New
York Stock Exchange ("NYSE") and are required to be secured continuously by
collateral consisting of cash, cash equivalents, or United States Treasury bills
maintained in an amount at least equal to the market value of the securities
loaned. Each Fund will have the right to call a loan and obtain the securities
loaned at any time upon five days' notice. During the existence of a loan we
will receive the income earned on investment of collateral. The aggregate value
of the securities loaned will not exceed 30% of the value of a Fund's gross
assets.

Covered Call Options. A Fund may write covered call options on securities in our
portfolio in an attempt to increase income and provide greater flexibility in
the disposition of portfolio securities. A "call option" is a contract sold for
a price (the "premium") giving its holder the right to buy a specific number of
shares of a stock at a specific price prior to a specified date. A "covered call
option" is a call option issued on securities already owned by the writer of the
call option for delivery to the holder upon the exercise of the option. During
the period of the option, a Fund forgoes the opportunity to profit from any
increase in the market price of the underlying security above the exercise price
of the option (to the extent that the increase exceeds our net premium). A Fund
also may enter into "closing purchase transactions" in order to terminate an
obligation to deliver the underlying security (this may result in a short-term
gain or loss). A closing purchase transaction is the purchase of a call option
(at a cost which may be more or less than the premium received for writing the
original call option) on the same security with the same exercise price and call
period as the option previously written. If a Fund is unable to enter into a
closing purchase transaction, it may be required to hold a security that it
otherwise might have sold to protect against depreciation. A Fund does not
intend to write covered call options with respect to securities with an
aggregate market value of more than 5% of a Fund's gross assets at the time an
option is written. This percentage limitation will not be increased without
prior disclosure in a Funds' current prospectus.

Rights And Warrants. A Fund may invest in rights and warrants to purchase
securities. Included within that amount, but not to exceed 5% of the value of
the Fund's gross assets, may be warrants which are not listed on the NYSE or
American Stock Exchange.

Rights represent a privilege offered to holders of record of issued securities
to subscribe (usually on a pro rata basis) for additional securities of the same
class, of a different class or of a different issuer, as the case may be.
Warrants represent the privilege to purchase securities at a stipulated price
and are usually valid for several years. Rights and warrants generally do not
entitle a holder to dividends or voting rights with respect to the underlying
securities nor do they represent any rights in the assets of the issuing
company.

Also, the value of a right or warrant may not necessarily change with the value
of the underlying securities and rights and warrants cease to have value if they
are not exercised prior to their expiration date.

Options And Financial Futures Transactions. A Fund may engage in options and
financial futures transactions in accordance with their investment objective and
policies. Although each Fund is not currently employing such options and
financial futures transactions, they may engage in such transactions in the
future if it appears advantageous to us to do so, in order to cushion the
effects of fluctuating interest rates and adverse market conditions. The use of
options 


                                       3


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<PAGE>

and financial futures, and possible benefits and attendant risks, are discussed
below, along with information concerning certain other investment policies and
techniques.

Financial Futures Contracts. A Fund may enter into contracts for the future
delivery of a financial instrument, such as a security or the cash value of a
securities index. This investment technique is designed primarily to hedge
(i.e., protect) against anticipated future changes in interest rates or market
conditions which otherwise might adversely affect the value of securities which
a Fund holds or intends to purchase. A "sale" of a futures contract means the
undertaking of a contractual obligation to deliver the securities or the cash
value of an index called for by the contract at a specified price during a
specified delivery period. A "purchase" of a futures contract means the
undertaking of a contractual obligation to acquire the securities or cash value
of an index at a specified price during a specified delivery period. At the time
of delivery pursuant to the contract, adjustments are made to recognize
differences in value arising from the delivery of securities which differ from
those specified in the contract. In some cases, securities called for by a
futures contract may not have been issued at the time the contract was written.
A Fund will not enter into any futures contracts or options on futures contracts
if the aggregate of the market value of the securities covered by either's
outstanding futures contracts and securities covered by futures contracts
subject to the outstanding options written by us would exceed 50% of its total
assets.

Although some financial futures contracts by their terms call for the actual
delivery or acquisition of securities, in most cases, a party will close out the
contractual commitment before delivery without having to make or take delivery
of the security by purchasing (or selling, as the case may be) on a commodities
exchange an identical futures contract calling for delivery in the same month.
Such a transaction, if effected through a member of an exchange, cancels the
obligation to make or take delivery of the securities. All transactions in the
futures market are made, offset or fulfilled through a clearing house associated
with the exchange on which the contracts are traded. A Fund will incur brokerage
fees when they purchase or sell contracts and will be required to maintain
margin deposits. At the time they enter into a futures contract, it is required
to deposit with the custodian, on behalf of the broker, a specified amount of
cash or eligible securities called "initial margin." The initial margin required
for a futures contract is set by the exchange on which the contract is traded.
Subsequent payments, called "variation margin," to and from the broker are made
on a daily basis as the market price of the futures contract fluctuates. The
costs incurred in connection with futures transactions could reduce our return.
Futures contracts entail risks. If the investment adviser's judgment about the
general direction of interest rates or markets is wrong, the overall performance
may be poorer than if no such contracts had been entered into.

There may be an imperfect correlation between movements in prices of futures
contracts and portfolio securities being hedged. The degree of difference in
price movements between futures contracts and the securities (or securities
indices) being hedged depends upon such things as variations in demand for
futures contracts and securities underlying the contracts and differences
between the liquidity of the markets for such contracts and the securities
underlying them. In addition, the market prices of futures contracts may be
affected by certain factors not directly related to the underlying securities.
At any given time, the availability of futures contracts, and hence their
prices, are influenced by credit conditions and margin requirements. Due to the
possibility of price distortions in the futures market and because of the
imperfect correlation between movements in the prices of securities and
movements in the prices of futures contracts, a correct forecast of market
trends by the investment adviser may not result in a successful hedging
transaction.


                                       4


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<PAGE>

Options On Financial Futures Contracts. A Fund may purchase and write call and
put options on financial futures contracts. An option on a futures contract
gives the purchaser the right, in return for the premium paid, to assume a
position in a futures contract at a specified exercise price at any time during
the period of the option. Upon exercise, the writer of the option delivers the
futures contract to the holder at the exercise price. A Fund would be required
to deposit with the custodian initial margin and maintenance margin with respect
to put and call options on futures contracts written by a Fund. Options on
futures contracts involve risks similar to the risks relating to transactions in
financial futures contracts described above. Generally speaking, a given dollar
amount used to purchase an option on a financial futures contract can hedge a
much greater value of underlying securities than if that amount were used to
directly purchase the same financial futures. Should the event it intends to
hedge (or protect) against not materialize, however, the option may expire
worthless, in which case a Fund would lose the premium paid therefor.

Segregated Accounts. To the extent required to comply with Securities and
Exchange Commission Release 10666 and subsequent interpretation thereof by the
Commission or its staff, when purchasing a futures contract, or writing a put
option, each Fund will maintain in a segregated account at the custodian bank in
liquid high grade debt obligations, such as cash and U.S. Government Securities
to cover its position.

Repurchase Agreements. If a Fund enter into repurchase agreements as provided in
clause (4) of the fundamental investment restrictions above, it will do so only
with those primary reporting dealers that report to the Federal Reserve Bank of
New York and with the 100 largest United States commercial banks and the
underlying securities purchased under the agreements will consist only of those
securities in which the a Fund otherwise may invest.

Foreign Currency Hedging Techniques. A Fund may utilize various foreign currency
hedging techniques described below, including forward foreign currency contracts
and foreign currency put and call options.

Forward Foreign Currency Contracts. A forward foreign currency contract involves
an obligation to purchase or sell a specific amount of a specific currency at a
set price at a future date. A Fund expects to enter into forward foreign
currency contracts in primarily two circumstances. First, when a Fund enters
into a contract for the purchase or sale of a security denominated in a foreign
currency, it may desire to "lock in" the U.S. dollar price of the security. By
entering into a forward contract for the purchase or sale of the amount of
foreign currency involved in the underlying security transaction, a Fund will be
able to protect against a possible loss resulting from an adverse change in the
relationship between the U.S. dollar and the subject foreign currency during the
period between the date the security is purchased or sold and the date on which
payment is made or received.

Second, when management believes that the currency of a particular foreign
country may suffer a decline against the U.S. dollar, a Fund may enter into a
forward contract to sell the amount of foreign currency approximating the value
of some or all of a Fund's portfolio securities denominated in such foreign
currency or, in the alternative, a Fund may use a cross-hedging technique
whereby it sells another currency which a Fund expects to decline in a similar
way but which has a lower transaction cost. Precise matching of the forward
contract amount and the value of the securities involved will not generally be
possible since the future value of such securities denominated in foreign
currencies will change as a consequence of market movements in the value of
those securities between the date the forward contract is entered into and the
date it matures. A Fund does not intend to enter into such forward contracts
under this second circumstance on a continuous basis.

Foreign Currency Put And Call Options. The Micro-Cap Growth Fund also may
purchase foreign currency put options and write foreign currency call options on
U.S. exchanges or U.S. over-the-counter markets. A put option gives a Fund, upon
payment of a premium, the right to sell a currency at the exercise price until
the expiration of the option and serves to insure against adverse currency price
movements in the underlying portfolio assets denominated in that currency.


                                       5


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Exchange-listed options markets in the United States include several major
currencies, and trading may be thin and illiquid. A number of major investment
firms trade unlisted options which are more flexible than exchange-listed
options with respect to strike price and maturity date. Unlisted options
generally are available in a wider range of currencies. Unlisted foreign
currency options are generally less liquid than listed options and involve the
credit risk associated with the individual issuer. The premiums paid for such
currency put options will not exceed 5% of the net assets of a Fund. Unlisted
options, together with other illiquid securities, are subject to a limit of 15%
of a Fund's net assets. The face value of such currency call option writing or
cross-hedging may not exceed 90% of the value of the securities denominated in
such currency (a) invested in to cover such call writing or to be crossed.

A call option written by a Fund gives the purchaser, upon payment of a premium,
the right to purchase from a Fund a currency at the exercise price until the
expiration of the option. A Fund may write a call option on a foreign currency
only in conjunction with a purchase of a put option on that currency. Such a
strategy is designed to reduce the cost of downside currency protection by
limiting currency appreciation potential. The face value of such writing may not
exceed 90% of the value of the securities denominated in such currency invested
in by a Fund or in such cross currency (referred to above) to cover such call
writing.

Each Fund's custodian will segregate cash or permitted securities belonging to
the Fund in an amount not less than that required by SEC Release 10666 and
related policies with respect to the Fund's assets committed to (a) writing
options, (b) forward foreign currency contracts and (c) cross hedges entered
into by the Fund. If the value of the securities segregated declines, additional
cash or debt securities will be added on a daily basis (i.e., marked to market),
so that the segregated amount will not be less than the amount of the Fund's
commitments with respect to such written options, forward foreign currency
contracts and cross hedges.

Limitations On The Purchases And Sales Of Stock Options, Options On Stock
Indices And Stock Index Futures. Each Fund may write put and call options on
stocks only if they are covered, and such options must remain covered so long as
the Fund is obligated as a writer. The Fund will not (a) write puts having an
aggregate exercise price greater than 25% of its total net assets; or (b)
purchase (i) put options on stocks not held in the Fund's portfolio, (ii) put
options on stock indices or (iii) call options on stocks or stock indices if,
after any such purchase, the aggregate premiums paid for such options would
exceed 20% of the Fund's total net assets.

Call Options On Stock. Each Fund may, from time to time, write call options on
its portfolio securities. Each Fund may write only call options which are
"covered," meaning that the Fund either owns the underlying security or has an
absolute and immediate right to acquire that security, without additional cash
consideration, upon conversion or exchange of other securities currently held in
its portfolio. In addition, the Fund will not permit the call to become
uncovered prior to the expiration of the option or termination through a closing
purchase transaction as described below. If the Fund writes a call option, the
purchaser of the option has the right to buy (and the Fund has the obligation to
sell) the underlying security at the exercise price throughout the term of the
option. The amount paid to the Fund by the purchaser of the option is the
"premium." The Funds' obligation to deliver the underlying security against
payment of the exercise price would terminate either upon expiration of the
option or earlier if the Fund' were to effect a "closing purchase transaction"
through the purchase of an equivalent option on an exchange. There can be no
assurance that a closing purchase transaction can be effected. The Fund does not
intend to write covered call options with respect to securities with an
aggregate market value of more than 5% of it's gross assets at the time an
option is written. This percentage limitation will not be increased without
prior disclosure in our current prospectus.

The Fund would not be able to effect a closing purchase transaction after it had
received notice of exercise. In order to write a call option, the Fund is
required to comply with the rules of The Options Clearing Corporation and the
various exchanges with respect to collateral requirements. The Fund may not
purchase call options except in connection with a closing purchase transaction.
It is possible that the cost of effecting a closing purchase transaction may be
greater than the premium received by the Fund for writing the option.


                                       6


<PAGE>

<PAGE>

Generally, the Fund intends to write listed covered call options during periods
when it anticipates declines in the market values of portfolio securities
because the premiums received may offset to some extent the decline in the
Fund's net asset value occasioned by such declines in market value. Except as
part of the "sell discipline" described below, the Fund will generally not write
listed covered call options when it anticipates that the market values of it's
portfolio securities will increase.

One reason for the Fund to write call options is as part of a "sell discipline."
If the Fund decides that a portfolio security would be overvalued and should be
sold at a certain price higher than the current price, it could write an option
on the stock at the higher price. Should the stock subsequently reach that price
and the option be exercised, the Fund would, in effect, have increased the
selling price of that stock, which it would have sold at that price in any
event, by the amount of the premium. In the event the market price of the stock
declined and the option were not exercised, the premium would offset all or some
portion of the decline. It is possible that the price of the stock could
increase beyond the exercise price; in that event, the Fund would forego the
opportunity to sell the stock at that higher price.

In addition, call options may be used as part of a different strategy in
connection with sales of portfolio securities. If, in the judgment of the Fund
Management, the market price of a stock is overvalued and it should be sold, the
Fund may elect to write a call option with an exercise price substantially below
the current market price. As long as the value of the underlying security
remains above the exercise price during the term of the option, the option will,
in all probability, be exercised, in which case the Fund will be required to
sell the stock at the exercise price. If the sum of the premium and the exercise
price exceeds the market price of the stock at the time the call option is
written, the Fund would, in effect, have increased the selling price of the
stock. The Fund would not write a call option in these circumstances if the sum
of the premium and the exercise price were less than the current market price of
the stock.

Put Options On Stock. Each Fund may also write listed put options. If the Fund
writes a put option, it is obligated to purchase a given security at a specified
price at any time during the term of the option.

Writing listed put options is a useful portfolio investment strategy when the
Fund has cash or other reserves available for investment as a result of sales of
Fund shares or, more importantly, because Fund Management believes a more
defensive and less fully invested position is desirable in light of market
conditions. If the Fund Management wishes to invest its cash or reserves in a
particular security at a price lower than current market value, it may write a
put option on that security at an exercise price which reflects the lower price
it is willing to pay. The buyer of the put option generally will not exercise
the option unless the market price of the underlying security declines to a
price near or below the exercise price. If the Fund writes a listed put, the
price of the underlying stock declines and the option is exercised, the premium,
net of transaction charges, will reduce the purchase price paid by the Fund for
the stock. The price of the stock may decline by an amount in excess of the
premium, in which event the Fund would have foregone an opportunity to purchase
the stock at a lower price.

If, prior to the exercise of a put option, the Fund determines that it no longer
wishes to invest in the stock on which the put option had been written, the Fund
may be able to effect a closing purchase transaction on an exchange by
purchasing a put option of the same series as the one which it has previously
written. The cost of effecting a closing purchase transaction may be greater
than the premium received on writing the put option and there is no guarantee
that a closing purchase transaction can be effected.

Each Fund may only write covered put options to the extent that cover for such
options does not exceed 25% of its net assets. Each Fund will not purchase an
option if, as a result of such purchase, more than 20% of its total assets would
be invested in premiums for such options.

Stock Index Options. Except as describe below, each Fund will write call options
on indices only if on such date it holds a portfolio of stocks at least equal to
the value of the index times the multiplier times the number of contracts. When
the Fund writes a call option on a broadly-based stock market index, the Fund
will segregate or put into escrow with its custodian, or pledge to a broker as
collateral for the option, one or more "qualified securities" with a market


                                       7


<PAGE>

<PAGE>

value at the time the option is written of not less than 100% of the current
index value times the multiplier times the number of contracts.

Stock Index Futures. Each Fund will engage in transactions in stock index
futures contracts as a hedge against changes resulting from market conditions in
the values of securities which are held in the Funds' portfolio or which it
intends to purchase. The Fund will engage in such transactions when they are
economically appropriate for the reduction of risks inherent in the ongoing
management of the Fund. The Fund may not purchase or sell stock index futures
if, immediately thereafter, more than one-third of its net assets would be
hedged and, in addition, except as described above in the case of a call written
and held on the same index, will write call options on indices or sell stock
index futures only if the amount resulting from the multiplication of the then
current level of the index (or indices) upon which the option or future
contract(s) is based, the applicable multiplier(s), and the number of futures or
options contracts which would be outstanding, would not exceed one-third of the
value of the Funds' net assets.

Risks Of Transactions In Stock Options. Writing options involves the risk that
there will be no market in which to effect a closing transaction. An option
position may be closed out only on an exchange which provides a secondary market
for an option of the same series. Although the Fund will generally write only
those options for which there appears to be an active secondary market, there is
no assurance that a liquid secondary market on an exchange will exist for any
particular option, or at any particular time, and for some options no secondary
market on an exchange may exist. If the Fund, as a covered call option writer,
is unable to effect a closing purchase transaction in a secondary market, it
will not be able to sell the underlying security until the option expires or it
delivers the underlying security upon exercise.

Risks Of Options On Indices. Each Funds' purchase and sale of options on indices
will be subject to risks described above under "Risk of Transactions in Stock
Options." In addition, the distinctive characteristics of options on indices
create certain risks that are not present with stock options.

Because the value of an index option depends upon movements in the level of the
index rather than the price of a particular stock, whether the Funds' will
realize a gain or loss on the purchase or sale of an option on an index depends
upon movements in the level of stock prices in the stock market generally or in
an industry or market segment rather than movements in the price of a particular
stock. Accordingly, successful use by the Fund of options on indices would be
subject to the investment adviser's ability to predict correctly movements in
the direction of the stock market generally or of a particular industry. This
requires different skills and techniques than predicting changes in the price of
individual stocks.

Index prices may be distorted if trading of certain stocks included in the index
is interrupted. Trading in the index option also may be interrupted in certain
circumstances, such as if trading were halted in a substantial number of stocks
included in the index. If this occurred, the Fund would not be able to close out
options which it had purchased or written and, if restrictions on exercise were
imposed, may be unable to exercise an option it holds, which could result in
substantial losses to the Fund. It is the Funds' policy to purchase or write
options only on indices which include a number of stocks sufficient to minimize
the likelihood of a trading halt in the index.

Trading in index options commenced in April 1983 with the S&P 100 option
(formerly called the CBOE 100). Since that time a number of additional index
option contracts have been introduced including options on industry indices.
Although the markets for certain index option contracts have developed rapidly,
the markets for other index options are still relatively illiquid. The ability
to establish and close out positions on such options will be subject to the
development and maintenance of a liquid secondary market. It is not certain that
this market will develop in all index option contracts. The Fund will not
purchase or sell any index option contract unless and until, in Fund
management's opinion, the market for such options has developed sufficiently
that such risk in connection with such transactions in no greater than such risk
in connection with options on stocks.


                                       8


<PAGE>

<PAGE>

Special Risks Of Writing Calls On Indices. Because exercises of index options
are settled in cash, a call writer cannot determine the amount of its settlement
obligations in advance and, unlike call writing on specific stocks, cannot
provide in advance for, or cover, its potential settlement obligations by
acquiring and holding the underlying securities. However, the Fund will write
call options on indices only under the circumstances described above under
"Limitations on the Purchases and Sales of Stock Options, Options on Stock
Indices and Stock Index Futures."

Price movements in the Fund's portfolio probably will not correlate precisely
with movements in the level of the index and, therefore, the Fund bears the risk
that the price of the securities held may not increase as much as the index. In
such event the Fund would bear a loss on the call which is not completely offset
by movements in the price of the Fund's portfolio. It is also possible that the
index may rise when the Funds' portfolio of stocks does not rise. If this
occurred, the Fund would experience a loss on the call which is not offset by an
increase in the value of its portfolio and might also experience a loss in its
portfolio. However, because the value of a diversified portfolio will, over
time, tend to move in the same direction as the market, movements in the value
of the Fund in the opposite direction to the market would be likely to occur for
only a short period or to a small degree.

Unless the Fund has other liquid assets that are sufficient to satisfy the
exercise of a call, the Fund would be required to liquidate portfolio securities
in order to satisfy the exercise. Because an exercise must be settled within
hours after receiving the notice of exercise, if the Fund fails to anticipate an
exercise, it may have to borrow (in amounts not exceeding 20% of the Fund's
total assets) pending settlement of the sale of securities in its portfolio and
would incur interest charges thereon.

When the Fund has written a call, there is also a risk that the market may
decline between the time the call is written and the time the Fund is able to
sell stocks in its portfolio. As with stock options, the Fund will not learn
that an index option has been exercised until the day following the exercise
date but, unlike a call on stock where the Fund would be able to deliver the
underlying securities in settlement, the Fund may have to sell part of its stock
portfolio in order to make settlement in cash, and the price of such stocks
might decline before they can be sold. This timing risk makes certain strategies
involving more than one option substantially more risky with index options than
with stock options. For example, even if an index call which the Fund has
written is "covered" by an index call held by the Fund with the same strike
price, the Fund will bear the risk that the level of the index may decline
between the close of trading on the date the exercise notice is filed with the
clearing corporation and the close of trading on the date the Fund exercises the
call it holds or the time the Fund sells the call which in either case would
occur no earlier than the day following the day the exercise notice was filed.

Special Risks Of Purchasing Puts And Calls On Indices. If the Fund holds an
index option and exercises it before final determination of the closing index
value for that day, it runs the risk that the level of the underlying index may
change before closing. If such a change causes the exercised option to fall
out-of-the-money, the Fund will be required to pay the difference between the
closing index value and the exercise price of the option (times the applicable
multiple) to the assigned writer. Although the Fund may be able to minimize this
risk by withholding exercise instructions until just before the daily cut off
time or by selling rather than exercising an option when the index level is
close to the exercise price it may not be possible to eliminate this risk
entirely because the cut off times for index options may be earlier than those
fixed for other types of options and may occur before definitive closing index
values are announced.

                                       2.

                              Trustees and Officers

The following trustee is a partner of Lord, Abbett & Co. ("Lord Abbett"), The
General Motors Building, 767 Fifth Avenue, New York, New York 10153-0203. He has
been associated with Lord Abbett for over five years and is also an officer,
director, or trustee of twelve other Lord Abbett-sponsored funds. He is an
"interested person" as defined in the Act, and as such, may be considered to
have an indirect financial interest in the Rule 12b-1 Plan described in the
Prospectus.


                                       9


<PAGE>

<PAGE>

Robert S. Dow, age 54, Chairman and President

The following outside trustees are also directors or trustees of twelve other
Lord Abbett-sponsored funds referred to above.

E. Thayer Bigelow
Time Warner Inc.
1271 Avenue of the Americas
New York, New York

Senior Adviser, Time Warner Inc. Formerly, Acting Chief Executive Officer of
Courtroom Television Network (1997 - 1998). Formerly, President and Chief
Executive Officer of Time Warner Cable Programming, Inc. (1991 - 1997). Prior to
that, President and Chief Operating Officer of Home Box Office, Inc. Age 57.

William H.T. Bush
Bush-O'Donnell & Co., Inc.
101 South Hanley Road, Suite 1025
St. Louis, Missouri

Co-founder and Chairman of the Board of financial advisory firm of
Bush-O'Donnell & Company. Age 60.

Robert B. Calhoun, Jr.
Monitor Clipper Partners
650 Madison Avenue, 9th Floor
New York, New York

Managing Director of Monitor Clipper Partners and President of The Clipper Group
L.P., both private equity investment funds. Age 56.

Stewart S. Dixon
Wildman, Harrold, Allen & Dixon
225 W. Wacker Drive (Suite 2800)
Chicago, Illinois

Partner in the law firm of Wildman, Harrold, Allen & Dixon. Age 68.

John C. Jansing
162 S. Beach Road
Hobe Sound, Florida

Retired. Former Chairman of Independent Election Corporation of America, a proxy
tabulating firm. Age 73.

C. Alan MacDonald
Directorship Inc.
8 Sound Shore Drive
Greenwich, Connecticut

Managing Director of Directorship Inc., a consultancy in board management and
corporate governance. Formerly, General Partner of The Marketing Partnership,
Inc., a full service marketing consulting firm (1994-1997). Prior to that,
Chairman and Chief Executive Officer of Lincoln Snacks, Inc., manufacturer of
branded snack foods (1992-1994). His career spans 36 years at Stouffers and
Nestle with 18 of the years as Chief Executive Officer. Currently serves as


                                       10


<PAGE>

<PAGE>

Director of DenAmerica Corp., J. B. Williams Company, Inc., Fountainhead Water
Company and Exigent Diagnostics. Age 65.

Hansel B. Millican, Jr.
Rochester Button Company
1328 Broadway (Suite 816)
New York, New York

President and Chief Executive Officer of Rochester Button Company. Age 70.

Thomas J. Neff
Spencer Stuart
277 Park Avenue
New York, New York

Chairman of Spencer Stuart, an executive search consulting firm. Currently
serves as a Director of Ace, Ltd. (NYSE). Age 61.

The second column of the following table sets forth the compensation accrued for
outside directors. The third column sets forth information with respect to the
equity-based benefits accrued for outside directors/trustees maintained by the
Lord Abbett-sponsored funds. The fourth column sets forth information with
respect to the retirement plan for outside directors/trustees maintained by each
of the Lord Abbett-sponsored funds. No director/trustee of the funds associated
with Lord Abbett and no officer of the funds received any compensation from the
funds for acting as a director/trustee or officer.

<TABLE>
<CAPTION>
                   For the Fiscal Year Ended November 30, 1998
                   -------------------------------------------

        (1)                     (2)                   (3)                  (4)

                                                Pension or           For Year Ended
                                                Retirement Benefits  December 31, 1998
                                                Accrued by the       Total Compensation
                          Aggregate             Company and          Accrued by the Company and
                          Compensation          Twelve Other Lord    Twelve Other Lord
                          Accrued by            Abbett-sponsored     Abbett-sponsored
Name of Director          the Company(1)        Companies(2)         Companies
- ----------------          --------------        -----------------    --------------------------
<S>                       <C>                   <C>                  <C>     
E. Thayer Bigelow         $                     $17,068              $ 56,000
William H.T. Bush*        $                     none                 none
Robert B. Calhoun, Jr.**  $                     none                 none
Stewart S. Dixon          $                     $32,190              $ 55,000
John C. Jansing           $                     $45,0854             $ 55,000
C. Alan MacDonald         $                     $30,703              $ 57,400
Hansel B. Millican, Jr.   $                     $37,747              $ 55,000
Thomas J. Neff            $                     $19,853              $ 56,000
</TABLE>

* Elected as of  August 13, 1998
** Elected as of June 17, 1998

1.    Outside directors' fees, including attendance fees for board and committee
      meetings, are allocated among all Lord Abbett-sponsored companies based on
      the net assets of each fund. A portion of the fees payable by the Company
      to 


                                       11


<PAGE>

<PAGE>

      its outside directors is being deferred under a plan that deems the
      deferred amounts to be invested in shares of the Company for later
      distribution to the directors/trustees.

      The amounts of the aggregate compensation payable by the Micro-Cap Growth
      Fund as of November 30, 1998 deemed invested in Company shares, including
      dividends reinvested and changes in net asset value applicable to such
      deemed investments, were: Mr. Bigelow, $369.71; Mr. Calhoun, $130.87; Mr.
      Dixon, $0; Mr. Jansing, $356.17; Mr. MacDonald, $0; Mr. Millican, $360.68;
      and Mr. Neff, $364.43. If the amounts deemed invested in Company shares
      were added to each director's actual holdings of Company shares as of
      November 30, 1998, each would own, the following: Mr. Bigelow, 16.874
      shares; Mr. Calhoun, 5.973; Mr. Dixon, 132 shares; Mr. Jansing, 1,421.25
      shares; Mr. MacDonald, $0 shares; Mr. Millican, 16.462 shares; and Mr.
      Neff, 16.633 shares.

      The amounts of the aggregate compensation payable by the Micro-Cap Value
      Fund as of November 30, 1998 deemed invested in Company shares, including
      dividends reinvested and changes in net asset value applicable to such
      deemed investments, were: Mr. Bigelow, $0; Mr. Dixon, $0; Mr. Jansing, $0;
      Mr. MacDonald, $0; Mr. Millican, $0; and Mr. Neff, $0. If the amounts
      deemed invested in Company shares were added to each director's actual
      holdings of Company shares as of November 30, 1998, each would own, the
      following: Mr. Bigelow, 0 shares; Mr. Dixon, 0 shares; Mr. Jansing, 607.72
      shares; Mr. MacDonald, 0 shares; Mr. Millican, 0 shares; and Mr. Neff,
      650.57 shares.

2.    The amounts in Column 3 were accrued by the Lord Abbett-sponsored
      companies for the 12 months ended November 30, 1998 with respect to the
      equity based plans established for independent directors in 1996. This
      plan supercedes a previously approved retirement plan for all future
      directors. Current directors had the option to convert their accrued
      benefits under the retirement plan. All of the outside directors except
      one made such an election.

3.    This column shows aggregate compensation, including directors fees and
      attendance fees for board and committee meetings, of a nature referred to
      in footnote one, accrued by the Lord Abbett-sponsored companies during the
      year ended December 31, 1998.

4.    Mr. Jansing chose to continue to receive benefits under the retirement
      plan which provides that outside directors (trustees) may receive annual
      retirement benefits for life equal to their final annual retainer
      following retirement at or after age 72 with at least ten years of
      service. Thus, if Mr. Jansing were to retire and the annual retainer
      payable by the funds were the same as it is today, he would receive annual
      retirement benefits of $50,000.

Except where indicated, the following executive officers of the Company have
been associated with Lord Abbett for over five years. Of the following, Messrs.
Brown, Carper, Fetch, Hilstad, McGruder, Morris, and Walsh are partners of Lord
Abbett; the others are employees:

Executive Vice Presidents:
Zane Brown, age 47

Robert G. Morris, age 54

Vice Presidents:

Paul A. Hilstad, age 56 (with Lord Abbett since 1995; formerly Senior Vice
President and General Counsel of American Capital Management & Research, Inc.)

Daniel E. Carper, age 47

Robert P. Fetch, age 46

Timothy W. Horan, age 44


                                       12


<PAGE>

<PAGE>

Lawrence H. Kaplan, age 42 (with Lord Abbett since 1997 - formerly Vice
President and Chief Counsel of Salomon Brothers Asset Management Inc from 1995
to 1997, prior thereto Senior Vice President, Director and General Counsel of
Kidder Peabody Asset Management, Inc.)

Jerald Lanzotti, age 31

Stephen I. McGruder, age 55

A. Edward Oberhaus, age 39

Keith F. O'Connor, age 43

Fernando Saldanha, age 45

Christopher J. Towle, age 41

John J. Walsh, age 63

Treasurer:

Donna M. McManus, age 38, (with Lord Abbett since 1996, formerly a Senior
Manager at Deloitte & Touche LLP).

The Company does not hold an annual meeting of shareholders in any year unless
one or more matters are required to be acted on by shareholders under the Act.
Under the Company's Declaration of Trust, shareholder meeting may be called at
any time by certain officers of the Company or by a majority of the Board of
Trustees (I) for the purpose of taking action upon any matter requiring the vote
or authority of the Company's shareholders or upon other matters deemed to be
necessary or desirable or (ii) upon the written request of the holders of at
least one-quarter of the shares of the Fund's outstanding shares entitled to
vote at the meeting..

As of (DATE), 1999, our officers and directors, as a group, owned less than 1%
of each Funds' outstanding shares. As of (DATE), 1999, there were no record
holders of 5% or more of each Funds' outstanding shares.

                                       3.

                     Investment Advisory And Other Services

The services performed by Lord Abbett are described under "Management" in the
Prospectus. Under the Management Agreement, we are obligated to pay Lord Abbett
a monthly fee, based on average daily net assets for each month at an annual
rate of __ of 1% for each of the Micro-Cap Growth Fund and the Micro-Cap Value
Fund. These fees are allocated among the classes of each fund based on the
classes' proportionate share of each fund's average daily net assets.

Each Fund pays all expenses not expressly assumed by Lord Abbett, including,
without limitation, 12b-1 expenses, outside directors' fees and expenses,
association membership dues, legal and auditing fees, taxes, transfer and
dividend disbursing agent fees, shareholder servicing costs, expenses relating
to shareholder meetings, expenses of preparing, printing and mailing stock
certificates and shareholder reports, expenses of registering our shares under
federal and state securities laws, expenses of preparing, printing and mailing
prospectuses to existing shareholders, insurance premiums, brokerage and other
expenses connected with executing portfolio transactions.

The management fee paid to Lord Abbett by the Micro-Cap Growth Fund and the
Micro-Cap Value Fund for the fiscal years ended ________, Lord Abbett received
____ and _______, respectively.


                                       13


<PAGE>

<PAGE>

Although not obligated to do so, Lord Abbett may waive all or a part of its
management fees and or may assume other expenses of each fund.

Lord Abbett Distributor LLC serves as the principal underwriter for the Funds.

The Bank of New York ("BNY"), 48 Wall Street, New York, New York, is the
Company's custodian. In accordance with the requirements of Rule 17f-5, the
Company's directors have approved arrangements permitting the Funds' foreign
assets not held by BNY or its foreign branches to be held by certain qualified
foreign banks and depositories.

Deloitte & Touche LLP, Two World Financial Center, New York, New York, are the
independent auditors of the Company and must be approved at least annually by
our Board of Directors to continue in such capacity. Deloitte & Touche LLP
perform audit services for each Fund, including the examination of financial
statements included in our Annual Report to Shareholders.

United Missouri Bank of Kansas City, N.A., Tenth and Grand, Kansas City,
Missouri, acts as the transfer agent and dividend disbursing agent for the
Funds.

                                       4.

                             Portfolio Transactions

The Company's policy is to obtain best execution on all our portfolio
transactions, which means that it seeks to have purchases and sales of portfolio
securities executed at the most favorable prices, considering all costs of the
transaction including brokerage commissions and dealer markups and markdowns and
taking into account the full range and quality of the brokers' services.
Consistent with obtaining best execution, we generally pay, as described below,
a higher commission than some brokers might charge on the same transaction. Our
policy with respect to best execution governs the selection of brokers or
dealers and the market in which the transaction is executed. To the extent
permitted by law, we may, if considered advantageous, make a purchase from or
sale to another Lord Abbett-sponsored fund without the intervention of any
broker-dealer.

Broker-dealers are selected on the basis of their professional capability and
the value and quality of their brokerage and research services. Normally, the
selection is made by traders who are officers of each Lord Abbett-sponsored fund
and also are employees of Lord Abbett. These traders do the trading as well for
other accounts -- investment companies (of which they are also officers) and
other investment clients -- managed by Lord Abbett. They are responsible for
obtaining best execution.

We pay a commission rate that we believe is appropriate to give maximum
assurance that our brokers will provide us, on a continuing basis, the highest
level of brokerage services available. While we do not always seek the lowest
possible commissions on particular trades, we believe that our commission rates
are in line with the rates that many other institutions pay. Our traders are
authorized to pay brokerage commissions in excess of those that other brokers
might accept on the same transactions in recognition of the value of the
services performed by the executing brokers, viewed in terms of either the
particular transaction or the overall responsibilities of Lord Abbett with
respect to us and the other accounts they manage. Such services include showing
us trading opportunities including blocks, a willingness and ability to take
positions in securities, knowledge of a particular security or market proven
ability to handle a particular type of trade, confidential treatment, promptness
and reliability.

Some of these brokers also provide research services at least some of which are
useful to Lord Abbett in their overall responsibilities with respect to us and
the other accounts they manage. Research includes the furnishing of analyses and
reports concerning issuers, industries, securities, economic factors and trends,
portfolio strategy and the performance of accounts and trading equipment and
computer software packages, acquired from third-party suppliers, that enable
Lord Abbett to access various information bases. Such services may be used by
Lord Abbett in servicing all their accounts, and not all of such services will
necessarily be used by Lord Abbett in connection with their management of the
Fund; conversely, such services furnished in connection with brokerage on other
accounts managed by Lord Abbett 


                                       14


<PAGE>

<PAGE>

may be used in connection with their management of the Fund, and not all of such
services will necessarily be used by Lord Abbett in connection with their
advisory services to such other accounts. We have been advised by Lord Abbett
that research services received from brokers cannot be allocated to any
particular account, are not a substitute for Lord Abbett's services but are
supplemental to their own research effort and, when utilized, are subject to
internal analysis before being incorporated by Lord Abbett into their investment
process. As a practical matter, it would not be possible for Lord Abbett to
generate all of the information presently provided by brokers. While receipt of
research services from brokerage firms has not reduced Lord Abbett's normal
research activities, the expenses of Lord Abbett could be materially increased
if it attempted to generate such additional information through its own staff
and purchased such equipment and software packages directly from the suppliers.

No commitments are made regarding the allocation of brokerage business to or
among brokers, and trades are executed only when they are dictated by investment
decisions of the Lord Abbett-sponsored funds to purchase or sell portfolio
securities.

If two or more broker-dealers are considered capable of offering the equivalent
likelihood of best execution, the broker-dealer who has sold the Lord
Abbett-sponsored funds' shares and/or shares of other Lord Abbett-sponsored
funds may be preferred.

If other clients of Lord Abbett buy or sell the same security at the same time
as a Lord Abbett-sponsored fund does, transactions will, to the extent
practicable, be allocated among all participating accounts in proportion to the
amount of each order and will be executed daily until filled so that each
account shares the average price and commission cost of each day. Other clients
who direct that their brokerage business be placed with specific brokers or who
invest through wrap accounts introduced to Lord Abbett by certain brokers may
not participate with a Lord Abbett-sponsored fund in the buying and selling of
the same securities as described above. If these clients wish to buy or sell the
same security as a Lord Abbett-sponsored fund does, they may have their
transactions executed at times different from our transactions and thus may not
receive the same price or incur the same commission cost as a Lord
Abbett-sponsored fund does.

The Lord Abbett-sponsored funds will not seek "reciprocal" dealer business (for
the purpose of applying commissions in whole or in part for their benefit or
otherwise) from dealers as consideration for the direction to them of portfolio
business.

                                       5.

                             Purchases, Redemptions
                            And Shareholder Services

Information concerning how we value our shares for the purchase and redemption
of our shares is contained in the Prospectus under "Purchases".

As disclosed in the Prospectus, we calculate our net asset value as of the close
of the New York Stock Exchange ("NYSE") on each day that the NYSE is open for
trading by dividing our total net assets by the number of shares outstanding at
the time of calculation. The NYSE is closed on Saturdays and Sundays and the
following holidays -- New Year's Day, Martin Luther King, Jr. Day, Presidents'
Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and
Christmas.

The Company values its portfolio securities at market value as of the close of
the NYSE. Market value will be determined as follows: securities listed or
admitted to trading privileges on the New York or American Stock Exchange or on
the NASDAQ National Market System are valued at the last sales price, or, if
there is no sale on that day, at the mean between the last bid and asked prices,
or, in the case of bonds, in the over-the-counter market if, in the judgment of
the Funds' officers, that market more accurately reflects the market value of
the bonds. Over-the-counter securities not traded on the NASDAQ National Market
System are valued at the mean between the last bid and asked prices. 


                                       15


<PAGE>

<PAGE>

Securities for which market quotations are not available are valued at fair
market value under procedures approved by the Board of Directors.

The net asset value per share for the Class Y shares will be determined by
taking Class Y shares net assets and dividing by shares outstanding. Our Class Y
shares will be offered at net asset value.

The offering price of Class Y shares of the Funds for the period indicated below
were computed as follows:

Net asset value per share (net assets divided
by shares outstanding) . . . . . . . . . . . . . . . . .$

Each Fund has entered into a distribution agreement with Lord Abbett Distributor
LLC, a New York limited liability company ("Lord Abbett Distributor") and
subsidiary of Lord Abbett under which Lord Abbett Distributor is obligated to
use its best efforts to find purchasers for the shares of each Fund, and to make
reasonable efforts to sell Fund shares so long as, in Lord Abbett Distributor's
judgment, a substantial distribution can be obtained by reasonable efforts.

Class Y Share Exchanges. The Prospectus describes the Telephone Exchange
Privilege. You may exchange some or all of your Y shares for Y shares of any
Lord Abbett-sponsored funds currently offering Class Y shares to the public.
Currently those other funds consist of Lord Abbett Affiliated Fund, Lord Abbett
Investment Trust - High Yield Fund, Core Fixed Income Fund, Strategic Core Fixed
Income Fund, Bond-Debenture Fund, Developing Growth Fund, and Mid-Cap Value
Fund, Growth Opportunities Fund, International Fund and Small-Cap Value Fund.

Redemptions. A redemption order is in proper form when it contains all of the
information and documentation required by the order form or supplementally by
Lord Abbett Distributor or the Fund to carry out the order. The signature(s) and
any legal capacity of the signer(s) must be guaranteed by an eligible guarantor.
See the Prospectus for expedited redemption procedures.

The right to redeem and receive payment, as described in each Prospectus, may be
suspended if the NYSE is closed (except for weekends or customary holidays),
trading on the NYSE is restricted or the Securities and Exchange Commission
deems an emergency to exist.

Our Board of Trustees may authorize redemption of all of the shares in any
account in which there are fewer than 25 shares. Before authorizing such
redemption, the Board must determine that it is in our economic best interest or
necessary to reduce disproportionately burdensome expenses in servicing
shareholder accounts. At least 6 month's prior written notice will be given
before any such redemption, during which time shareholders may avoid redemption
by bringing their accounts up to the minimum set by the Board.

                                       6.

                                   Performance

Each Fund computes the annual compounded rate of total return for Class Y shares
during specified periods that would equate the initial amount invested to the
ending redeemable value of such investment by adding one to the computed average
annual total return, raising the sum to a power equal to the number of years
covered by the computation and multiplying the result by one thousand dollars,
which represents a hypothetical initial investment. The calculation assumes
deduction of no sales charge from the initial amount invested and reinvestment
of all income dividends and capital gains distributions on the reinvestment
dates at prices calculated as stated in the Prospectus. The ending redeemable
value is determined by assuming a complete redemption at the end of the
period(s) covered by the annual total return computation.


                                       16


<PAGE>

<PAGE>

In calculating total returns for Class Y shares no sales charge is deducted from
the initial investment and the return is shown at net asset value. Total returns
also assume that all dividends and capital gains distributions during the period
are reinvested at net asset value per share, and that the investment is redeemed
at the end of the period.

Our yield quotation for Class Y shares is based on a 30-day period ended on a
specified date, computed by dividing the net investment income per share earned
during the period by the net asset value per share of such class on the last day
of the period. This is determined by finding the following quotient: take the
dividends and interest earned during the period for the class minus its expenses
accrued for the period and divide by the product of (i) the average daily number
of Class shares outstanding during the period that were entitled to receive
dividends and (ii) the net asset value per share of such class on the last day
of the period. To this quotient add one. This sum is multiplied by itself five
times. Then one is subtracted from the product of this multiplication and the
remainder is multiplied by two. Yields for Class Y shares do not reflect the
deduction of any sales charge.

These figures represent past performance, and an investor should be aware that
the investment return and principal value of a Fund's investment will fluctuate
so that an investor's shares, when redeemed, may be worth more or less than
their original cost. Therefore, there is no assurance that this performance will
be repeated in the future.

                                       7.

                                      Taxes

The value of any shares redeemed by each Fund or repurchased or otherwise sold
may be more or less than your tax basis in the shares at the time of
disposition. Any gain will generally be taxable for United States federal income
tax purposes. Any loss realized on the disposition of fund shares which you have
held for six months or less will be treated for tax purposes as a long-term
capital loss to the extent of any "capital gains distributions" which you
received with respect to such shares. Losses on the sale of shares are not
deductible if, within a period beginning 30 days before the date of the sale and
ending 30 days after the date of the sale, the taxpayer acquires shares that are
substantially identical.

The writing of call options and other investment techniques and practices which
a Fund may utilize may affect the character and timing of the recognition of
gains and losses. Such transactions may increase the amount of short-term
capital gain realized by such Fund, which is taxed as ordinary income when
distributed to shareholders. Limitations imposed by the Internal Revenue Code on
regulated investment companies may restrict a Fund's ability to engage in
transactions in options.

A Fund may be subject to foreign withholding taxes, which would reduce the yield
on its investments. It is generally expected that fund shareholders who are
subject to United States federal income tax will not be entitled to claim a
federal income tax credit or deduction for foreign income taxes paid by such
Fund.

Each Fund will be subject to a 4% non-deductible excise tax on certain amounts
not distributed or treated as having been distributed on a timely basis each
calendar year. Each Fund intends to distribute to shareholders each year an
amount adequate to avoid the imposition of such excise tax.

Dividends paid by a Fund will qualify for the dividends-received deduction for
corporations to the extent they are derived from dividends paid by domestic
corporations.

Gain and loss realized by a Fund on certain transactions, including sales of
foreign debt securities and certain transactions involving foreign currency,
will be treated as ordinary income or loss for federal income tax purposes to
the extent, if any, that such gain or loss is attributable to changes in
exchange rates for foreign currencies. Accordingly, distributions taxable as
ordinary income will include the net amount, if any, of such foreign exchange
gain and will be reduced by the net amount, if any, of such foreign exchange
loss.


                                       17


<PAGE>

<PAGE>

If a Fund purchases shares in certain foreign investment entities called
"passive foreign investment companies," they may be subject to United States
federal income tax on a portion of any "excess distribution" or gain from the
disposition of such shares, even if such income is distributed as a taxable
dividend by the Fund to its shareholders. Additional charges in the nature of
interest may be imposed on either the Fund or its shareholders in respect of
deferred taxes arising from such distributions or gains. If the Funds were to
make a "qualified electing fund" election with respect to its investment in a
passive foreign investment company, in lieu of the foregoing requirements, such
Fund might be required to include in income each year a portion of the ordinary
earnings and net capital gains of the qualified electing fund, even if such
amount were not distributed to such Fund.

The foregoing discussion relates solely to U.S. federal income tax law as
applicable to United States persons (United States citizens or residents and
United States domestic corporations, partnerships, trusts and estates.) Each
shareholder who is not a United States person should consult his tax adviser
regarding the U.S. and foreign tax consequences of the ownership of shares of a
Fund, including a 30% (or lower treaty rate) United States withholding tax on
dividends representing ordinary income and net short-term capital gains, and the
applicability of United States gift and estate taxes.


                                       18


<PAGE>

<PAGE>

                                       8.

                          Information About the Company

The directors, trustees and officers of Lord Abbett-sponsored mutual funds,
together with the partners and employees of Lord Abbett, are permitted to
purchase and sell securities for their personal investment accounts. In engaging
in personal securities transactions, however, such persons are subject to
requirements and restrictions contained in the Fund's Code of Ethics which
complies, in substance, with each of the recommendations of the Investment
Company Institute's Advisory Group on Personal Investing. Among other things,
the Code requires that Lord Abbett partners and employees obtain advance
approval before buying or selling securities, submit confirmations and quarterly
transaction reports, and obtain approval before becoming a director of any
company; and it prohibits such persons from investing in a security 7 days
before or after any Lord Abbett-sponsored fund or Lord Abbett-managed account
considers a trade or trades in such security, prohibiting profiting on trades of
the same security within 60 days and trading on material and non-public
information. The Code imposes certain similar requirements and restrictions on
the independent directors and trustees of each Lord Abbett-sponsored mutual fund
to the extent contemplated by the recommendations of such Advisory Group.

                                       9.

                              Financial Statements

The financial statements for the fiscal year ended October 30, 1998 and the
reports of Deloitte & Touche LLP, independent auditors, on such financial
statements contained in the 1998 Annual Reports to Shareholders of the Lord
Abbett Securities Trust are incorporated herein by reference to such financial
statements and report in reliance upon the authority of Deloitte & Touche LLP as
experts in auditing and accounting.


                                       19


<PAGE>

<PAGE>

PART C OTHER INFORMATION

This Post-Effective Amendment No. 30 (the "Amendment") to the Registrant's
Registration Statement relates only to Lord Abbett Micro-Cap Growth Fund and
Lord Abbett-Micro-Cap Value Fund - class Y.

The other series and classes of shares of the Registrant are listed below and
are offered by the Prospectuses and Statements of Additional Information in
Parts A and B, respectively, of the Post-Effective Amendments to the
Registrant's Registration Statements as identified. The following are separate
series and/or classes of shares of the Registrant. This Amendment does not
relate to, amend or otherwise affect the Prospectuses and Statements of
Additional Information contained in the prior Post-Effective Amendments listed
below, and pursuant to Rule 485(d) under the Securities Act of 1933, does not
affect the effectiveness of such Post-Effective Amendments.

<TABLE>
<CAPTION>
                                                     POST-EFFECTIVE
                                                      AMENDMENT NO.
                                                      -------------
<S>                                                      <C>
Growth & Income Fund - classes A, B, C and P             No. 27
International Fund - classes A, B, C and P               No. 27
World Bond-Debenture Fund - classes A, B, C and P        No. 27
Alpha Fund - classes A, B, C and P                       No. 27
Large-Cap International - class Y                        No. 23
</TABLE>

Item 23 Exhibits

      (a)   Declaration of Trust is incorporated by reference to Post-Effective
            Amendment No.19 to the Registration Statement on Form N-1A filed on
            3/1/98.
      (b)   By-Laws incorporated by reference to Post-Effective Amendment No. 25
            to the Registration Statement on Form N-1A filed on 12/30/98.
      (c)   Instruments Defining Rights of Security Holders incorporated by
            reference.
      (d)   Investment Advisory Contracts incorporated by reference.
      (e)   Underwriting Contracts incorporated by reference.
      (f)   Bonus or Profit Sharing Contracts is incorporated by reference to
            Post Effective Amendment No. 6 to the Registration Statement on Form
            N-1A filed on October 7, 1994.
      (g)   Custodian Agreements incorporated by reference.
      (h)   Other Material Contracts incorporated by reference.
      (i)   Legal Opinion incorporated by reference.
      (j)   Other Opinion. Consent of Independent Auditors incorporated by
            reference.
      (k)   Omitted Financial Statements incorporated by reference.
      (l)   Initial Capital Agreements incorporated by reference.
      (m)   Rule 12b-1 Plan incorporated by reference to Post Effective
            Amendment No. 12 filed on August 29, 1996.
      (n)   Financial Data Schedule.
      (o)   Rule 18f-3 Plan. Incorporated by reference to Post Effective
            Amendment No. 12 filed on August 29, 1996.

Item 24 Persons Controlled by or Under Common Control with the Fund

        None.

Item 25 Indemnification


                                       1


<PAGE>

<PAGE>

        All Trustees, officers, employees and agents of Registrant are to be
        indemnified as set forth in Section 4.3 of Registrant's Declaration of
        Trust.

        Insofar as indemnification for liability arising under the Securities
        Act of 1933 may be permitted to Trustees, officers and controlling
        persons of the Registrant pursuant to the foregoing provisions, or
        otherwise, the Registrant has been advised that in the opinion of the
        Securities and Exchange Commission such indemnification is against
        public policy as expressed in the Act and is, therefore, unenforceable.
        In the event that a claim for indemnification against such liabilities
        (other than the payment by the Registrant of expense incurred or paid by
        a Trustee, officer or controlling person of the Registrant in the
        successful defense of any action, suit or proceeding) is asserted by
        such Trustee, officer or controlling person in connection with the
        securities being registered, the Registrant will, unless in the opinion
        of its counsel the matter has been settled by controlling precedent,
        submit to a court of appropriate jurisdiction the question of whether
        such indemnification by it is against public policy as expressed in the
        Act and will be governed by the final adjudication of such issue.

        In addition, Registrant maintains a Trustees' and officers' errors and
        omissions liability insurance policy protecting Trustees and officers
        against liability for breach of duty, negligent act, error or omission
        committed in their capacity as Trustees or officers. The policy contains
        certain exclusions, among which is exclusion from coverage for active or
        deliberate dishonest or fraudulent acts and exclusion for fines or
        penalties imposed by law or other matters deemed uninsurable.

Item 26 Business and Other Connections of Investment Adviser

        Lord, Abbett & Co. acts as investment adviser for twelve other
        investment companies (of which it is principal underwriter for thirteen)
        and as investment adviser to approximately 8,300 private accounts as of
        September 30, 1998. Other than acting as trustees, directors and/or
        officers of open-end investment companies managed by Lord, Abbett & Co.,
        none of Lord, Abbett & Co.'s partners has, in the past two fiscal years,
        engaged in any other business, profession, vocation or employment of a
        substantial nature for his own account or in the capacity of director,
        officer, employee, partner or Trustee of any entity.

Item 27 Principal Underwriters

(a)     Lord Abbett Mid-Cap Value Fund, Inc.
        Lord Abbett Bond-Debenture Fund, Inc.
        Lord Abbett Developing Growth Fund, Inc.
        Lord Abbett Tax-Free Income Fund, Inc.
        Lord Abbett Global Fund, Inc.
        Lord Abbett Series Fund, Inc.
        Lord Abbett U.S. Government Money Market Fund, Inc.
        Lord Abbett Equity Fund
        Lord Abbett Tax-Free Income Trust
        Lord Abbett Affiliated Fund, Inc.
        Lord Abbett Investment Trust
        Lord Abbett Research Fund, Inc.

        Investment Advisor
        American Skandia Trust (Lord Abbett Growth & Income Portfolio)

(b)     The partners of Lord, Abbett & Co. are:


                                       2


<PAGE>

<PAGE>

<TABLE>
<CAPTION>
        Name and Principal            Positions and Offices
        Business Address (1)          with Registrant
        --------------------          ---------------
        <S>                           <C>
        Robert S. Dow                 Chairman and President
        Paul A. Hilstad               Vice President & Secretary
        Zane E. Brown                 Executive Vice President
        Robert G. Morris              Executive Vice President
        Daniel E. Carper              Vice President
        Robert P. Fetch               Vice President
        Stephem I. McGruder           Vice President
        Christopher J. Towle          Vice President
        John J. Walsh                 Vice President
</TABLE>

        The other general partners of Lord Abbett & Co. who are neither officers
        nor directors of the Registrant are Stephen I. Allen, John E. Erard,
        Daria L. Foster, Robert I. Gerber, Thomas W. Hudson, Jr., Michael
        McLaughlin, Robert J. Noelke, and R. Mark Pennington.

        Each of the above has a principal business address:
        767 Fifth Avenue, New York, NY 10153

(c)     Not applicable

Item 28 Location of Accounts and Records

        Registrant maintains the records, required by Rules 31a - 1(a) and (b),
        and 31a - 2(a) at its main office.

        Lord, Abbett & Co. maintains the records required by Rules 31a - 1(f)
        and 31a - 2(e) at its main office.

        Certain records such as cancelled stock certificates and correspondence
        may be physically maintained at the main office of the Registrant's
        Transfer Agent, Custodian, or Shareholder Servicing Agent within the
        requirements of Rule 31a-3.

Item 29 Management Services

        None

Item 30 Undertakings

        The Registrant undertakes to furnish each person to whom a prospectus is
        delivered with a copy of the Registrant's latest annual report to
        shareholders, upon request and without charge.

        The registrant undertakes, if requested to do so by the holders of at
        least 10% of the registrant's outstanding shares, to call a meeting of
        shareholders for the purpose of voting upon the question of removal of a
        director or directors and to assist in communications with other
        shareholders as required by Section 16(c) of the Investment Company Act
        of 1940, as amended.


                                       3


<PAGE>

<PAGE>

                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Fund has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of New York, and State of New York on the 21st day of
April, 1999.

                                                BY: /s/ Lawrence H. Kaplan
                                                    ----------------------------
                                                    Lawrence H. Kaplan
                                                    Vice President

Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed below by the following persons in the capacities and
on the date indicated.

<TABLE>
<CAPTION>
Signatures                                Title                      Date
<S>                                <C>                             <C>
                                  Chairman, President
/s/ Robert S. Dow                   and Director/Trustee           4/21/99
- -----------------------------     --------------------------    ----------------
Robert S. Dow

/s/ E. Thayer Bigelow             Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
E. Thayer Bigelow

/s/ William H.T. Bush             Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
William H. T. Bush

/s/ Robert B. Calhoun             Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
Robert B. Calhoun

/s/ Stewart S. Dixon              Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
Stewart S. Dixon

/s/ John C. Jansing               Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
John C. Jansing

C. Alan MacDonald                 Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
C. Alan MacDonald

/s/ Hansel B. Millican, Jr..      Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
Hansel B. Millican, Jr.

/s/ Thomas J. Neff                Director/Trustee                 4/21/99
- -----------------------------     --------------------------    ----------------
Thomas J. Neff

</TABLE>

                                       4


<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 041
<NAME>                   ALPHA SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-29-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        123152222
<INVESTMENTS-AT-VALUE>                       105665753
<RECEIVABLES>                                  1416463
<ASSETS-OTHER>                                  171942
<OTHER-ITEMS-ASSETS>                            240072
<TOTAL-ASSETS>                               107494230
<PAYABLE-FOR-SECURITIES>                       1123810
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        91652
<TOTAL-LIABILITIES>                            1215462
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     124158829
<SHARES-COMMON-STOCK>                          3839908
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           40837
<ACCUMULATED-NET-GAINS>                       (164572)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (17486469)
<NET-ASSETS>                                 106278768
<DIVIDEND-INCOME>                                    8
<INTEREST-INCOME>                                 5307
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   46152
<NET-INVESTMENT-INCOME>                        (40837)
<REALIZED-GAINS-CURRENT>                      (164572)
<APPREC-INCREASE-CURRENT>                   (17486469)
<NET-CHANGE-FROM-OPS>                       (17906761)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        4112331
<NUMBER-OF-SHARES-REDEEMED>                     272413
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       106268768
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0   
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            92165
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  93024
<AVERAGE-NET-ASSETS>                          22119606
<PER-SHARE-NAV-BEGIN>                            13.52
<PER-SHARE-NII>                                  (.03)
<PER-SHARE-GAIN-APPREC>                          (.58)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.91
<EXPENSE-RATIO>                                    .21
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 042
<NAME>                   ALPHA SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                  10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-29-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        123152222
<INVESTMENTS-AT-VALUE>                       105665753
<RECEIVABLES>                                  1416463
<ASSETS-OTHER>                                  171942
<OTHER-ITEMS-ASSETS>                            240072
<TOTAL-ASSETS>                               107494230
<PAYABLE-FOR-SECURITIES>                       1123810
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        91652
<TOTAL-LIABILITIES>                            1215462
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     124185529
<SHARES-COMMON-STOCK>                          2816426
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       144986
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (164572)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (17486469)
<NET-ASSETS>                                 106278768
<DIVIDEND-INCOME>                                    1
<INTEREST-INCOME>                                 4119
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  146106
<NET-INVESTMENT-INCOME>                       (141986)
<REALIZED-GAINS-CURRENT>                      (164572)
<APPREC-INCREASE-CURRENT>                   (17486469)
<NET-CHANGE-FROM-OPS>                       (17906761)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        2961179
<NUMBER-OF-SHARES-REDEEMED>                     144753
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       106268768
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0   
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            72907
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<PER-SHARE-NAV-END>                              12.85
<EXPENSE-RATIO>                                    .83
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 043
<NAME>                   ALPHA SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                  10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-29-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        123152222
<INVESTMENTS-AT-VALUE>                       105665753
<RECEIVABLES>                                  1416463
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<PAID-IN-CAPITAL-COMMON>                     124185529
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<INTEREST-INCOME>                                 1932
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 025
<NAME>                   INTERNATIONAL SERIES - CLASS Y
       
<S>                             <C>
<PERIOD-TYPE>                   10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-30-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        140121070
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<RECEIVABLES>                                 20652307
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<PAYABLE-FOR-SECURITIES>                        340848
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<OTHER-ITEMS-LIABILITIES>                       220327
<TOTAL-LIABILITIES>                             561175
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<ACCUMULATED-NET-GAINS>                         273865
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<NET-ASSETS>                                 153032505
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<INTEREST-INCOME>                               126352
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<EXPENSES-NET>                                  168904
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<REALIZED-GAINS-CURRENT>                        772716
<APPREC-INCREASE-CURRENT>                   (11465508)
<NET-CHANGE-FROM-OPS>                          9958214
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 011
<NAME>                   GROWTH & INCOME SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             NOV-01-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        108773129
<INVESTMENTS-AT-VALUE>                       158347885
<RECEIVABLES>                                   593958
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<PAYABLE-FOR-SECURITIES>                             0
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<PAID-IN-CAPITAL-COMMON>                     108951730
<SHARES-COMMON-STOCK>                          7965970
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<NET-ASSETS>                                 165904098
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<INTEREST-INCOME>                               123321
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<NET-CHANGE-FROM-OPS>                         16045678
<EQUALIZATION>                                       0
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<ACCUMULATED-NII-PRIOR>                         887952
<ACCUMULATED-GAINS-PRIOR>                      9550322  
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<GROSS-EXPENSE>                                 831366
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<PER-SHARE-NAV-BEGIN>                             8.79
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 012
<NAME>                   GROWTH & INCOME SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             NOV-01-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        108773129
<INVESTMENTS-AT-VALUE>                       158347885
<RECEIVABLES>                                   593958
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<OTHER-ITEMS-LIABILITIES>                       588996
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<ACCUMULATED-NET-GAINS>                        5845002
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<ACCUM-APPREC-OR-DEPREC>                      49574756
<NET-ASSETS>                                 165904098
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<INTEREST-INCOME>                                 3683
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<APPREC-INCREASE-CURRENT>                      9416949
<NET-CHANGE-FROM-OPS>                         16045678
<EQUALIZATION>                                       0
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<NUMBER-OF-SHARES-SOLD>                         351815
<NUMBER-OF-SHARES-REDEEMED>                      19528
<SHARES-REINVESTED>                               2736
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<ACCUMULATED-NII-PRIOR>                             22
<ACCUMULATED-GAINS-PRIOR>                      9550322
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<PER-SHARE-NAV-BEGIN>                             8.80
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<EXPENSE-RATIO>                                   1.98
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 013
<NAME>                   GROWTH & INCOME SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             NOV-01-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        108773129
<INVESTMENTS-AT-VALUE>                       158347885
<RECEIVABLES>                                   593958
<ASSETS-OTHER>                                 7550878
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<TOTAL-ASSETS>                               166493094
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0 
<OTHER-ITEMS-LIABILITIES>                       588996
<TOTAL-LIABILITIES>                             588996
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     108951730
<SHARES-COMMON-STOCK>                          9837873
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<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        5845002
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<ACCUM-APPREC-OR-DEPREC>                      49574756
<NET-ASSETS>                                 165904098
<DIVIDEND-INCOME>                              1751472
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<EXPENSES-NET>                                 1801280
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<REALIZED-GAINS-CURRENT>                       5911754
<APPREC-INCREASE-CURRENT>                      9416949
<NET-CHANGE-FROM-OPS>                         16045678
<EQUALIZATION>                                       0
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<NET-CHANGE-IN-ASSETS>                        22912423
<ACCUMULATED-NII-PRIOR>                         187999
<ACCUMULATED-GAINS-PRIOR>                      9550322  
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<PER-SHARE-NAV-BEGIN>                             8.80
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<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

<PAGE>




<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 031
<NAME>                   WORLD BOND DEBENTURE SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                  10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-18-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                         10001946
<INVESTMENTS-AT-VALUE>                         9425848
<RECEIVABLES>                                  4648711
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<SENIOR-EQUITY>                                      0
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<ACCUMULATED-NET-GAINS>                       (256978)
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<DIVIDEND-INCOME>                                    0 
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<PAGE>




<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 032
<NAME>                   WORLD BOND DEBENTURE SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                  10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-19-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                         10001946
<INVESTMENTS-AT-VALUE>                         9425848
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<TOTAL-ASSETS>                                14452252
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<PAID-IN-CAPITAL-COMMON>                      10894509
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<ACCUMULATED-NET-GAINS>                       (256978)
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<DIVIDEND-INCOME>                                    0 
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 033
<NAME>                   WORLD BOND DEBENTURE SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                  10-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             DEC-19-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                         10001946
<INVESTMENTS-AT-VALUE>                         9425848
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<PAID-IN-CAPITAL-COMMON>                      10894509
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<ACCUMULATED-NET-GAINS>                       (256978)
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 021
<NAME>                   INTERNATIONAL SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             NOV-01-1997
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                        140121070
<INVESTMENTS-AT-VALUE>                       131340840
<RECEIVABLES>                                 20652307
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<TOTAL-LIABILITIES>                             561175
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<PAID-IN-CAPITAL-COMMON>                     160315774
<SHARES-COMMON-STOCK>                          6508142
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 022
<NAME>                   INTERNATIONAL SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<PAGE>



<TABLE> <S> <C>

<ARTICLE>                6
<CIK>                    0000898031
<NAME>                   LORD ABBETT SECURITIES TRUST
<SERIES>
<NUMBER>                 023
<NAME>                   INTERNATIONAL SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-START>                             NOV-01-1997
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<PER-SHARE-NII>                                  (.02)
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<EXPENSE-RATIO>                                   2.05
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>




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