LORD ABBETT SECURITIES TRUST
485APOS, 1998-01-02
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                                                     1933 Act File No. 33-58846
                                                     1940 Act File No. 811-7538



                        SECURITIES & EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    FORM N-1A


           REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933    [X]
                       POST-EFFECTIVE AMENDMENT NO. 18                [X]

           REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT    [X]
                                     OF 1940
                              AMENDMENT NO. 18                        [X]



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


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

                  REGISTRANT'S TELEPHONE NUMBER (212) 848-1800


                         Thomas F. Konop, 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 on filing pursuant to paragraph (b) of Rule 485


____      on (date) pursuant to paragraph (b) of Rule 485


____      60 days after filing pursuant to paragraph (a) (1) of Rule 485


____      on October 14, 1997 pursuant to paragraph (a) (1) of Rule 485


_X__      75 days after filing pursuant to paragraph (a) (2) of Rule 485


____      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

<PAGE>

                          LORD ABBETT SECURITIES TRUST
                                      N-1A
                              Cross Reference Sheet
                         Post-Effective Amendment No.18

                                Explanatory Note

This  Post-Effective  Amendment  No. 18 (the  "Amendment")  to the  Registrant's
Registration  Statement relates only to the World  Bond-Debenture  Series of the
Lord Abbett Securities Trust.

          The other  series and classes of shares of the  Registrant  are listed
below and are offered by the Prospectus and Statement of Additional  Information
in  Parts  A and  B,  respectively,  of  the  Post-Effective  Amendment  to  the
Registrant's  Registration  Statement 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 Prospectus and Statement 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 prior Post-Effective Amendments.

                                             Post-Effective
                                             AMENDMENT NO.

Growth & Income Series- Class A, B and C         15
International Series - Class A, B and C          15
International Series - Class Y                   16
Alpha Series - Class A, B and C                  17


Form N-1A                              Location In Prospectus or
ITEM NO.                               STATEMENT OF ADDITIONAL INFORMATION

1                                      Cover Page
2                                      Fee Table
3                                      Finacial Highlights
4 (a) (i)                              Cover Page
4 (a) (ii)I                            Investment Objectives
4 (b) (c)                              How We Invest
5 (a) (b) (c)                          Our Management; Last Page
5 (d)                                  N/A
5 (e)                                  Our Management
5 (f)                                  Our Management
5 (g)                                  Purchases
6 (a)                                  Cover Page
6 (b)  (c) (d)                         N/A
6 (e)                                  Cover Page; Purchases
6 (f)  (g)                             Dividends, Capital Gains
                                       Distributions and Taxes
6 (h)                                  Purchases
7 (a)                                  Back Cover Page
7 (b) (c) (d)                          Purchases
8 (a)  (b) (c) (d)                     Redemptions
                                       Purchases, Redemptions and Shareholder 
                                       Services
<PAGE>

Form N-1A                              Location in Prospectus or
ITEM NO.                               STATEMENT OF ADDITIONAL INFORMATION



9                                      N/A
10                                     Cover Page
11                                     Cover Page -- Table of Contents
12                                     N/A
13 (a)  (b) (c) (d)                    Investment Objectives and Policies
14                                     Trustees and Officers
15 (a)  (b) (c)                        Trustees and Officers
16 (a) (i)                             Investment Advisory and Other
                                       Services
16 (a) (ii)                            Trustees and Officers
16 (a) (iii)                           Investment Advisory and Other
                                       Services
16 (b)                                 Investment Advisory and Other Services
16 (c)  (d) (e) (g)                    N/A
16 (f)                                 Purchases, Redemptions and Shareholder 
                                       Services
16 (h)                                 Investment Advisory and Other Services
16 (i)                                 N/A
17 (a)                                 Portfolio Transactions
17 (b)                                 N/A
17 (c)                                 Portfolio Transactions
17 (d) (e)                             N/A
18 (a)                                 Cover Page
18 (b)                                 N/A
19 (a) (b)                             Purchases; Redemptions and Shareholder 
                                       Services; Notes to Financial Statements
19 (c)                                 N/A
20                                     Taxes
21 (a)                                 Purchases, Redemptions and Shareholder 
                                        Services
21 (b) (c)                             N/A
22                                     N/A
22 (b)                                 Past Performance
23                                     Financial Statements; Supplementary



<PAGE>

LORD ABBETT SECURITIES TRUST
The General Motors Building
767 Fifth Avenue
New York, NY 10153-0203
800-426-1130

World Bond-Debenture Series ("we" or the "Series"), is a separate series of Lord
Abbett  Securities  Trust (the  "Fund").  The Fund  currently  consists  of four
series. Only shares of the World Bond-Debenture Series are being offered by this
Prospectus.  The Series  offers  three  classes of shares:  Class A, Class B and
Class C.  These  classes  provide  investors  different  investment  options  in
purchasing  shares of the  Fund.  See  "Purchases"  for a  description  of these
choices.
We seek high current  income and the  opportunity  for capital  appreciation  to
produce a high  total  return.  See  "Investment  Objective."  In  seeking  this
investment  objective,  the Series invests in lower-rated  debt securities which
entail  greater risks than  investments in  higher-rated  debt  securities.  The
former are referred to colloquially as "junk bonds." Before investing, investors
should  carefully  consider these risks set forth under "How We Invest" and also
that  at  least  20% of our  assets  must  be  invested  in any  combination  of
investment  grade debt  securities,  U.S.  Government or other  sovereign  state
securities and cash equivalents.  There can be no assurance that we will achieve
our objective.
By investing in  globally-diversified  debt  securities,  the Series  offers the
opportunity  for investors to take advantage of high current income with capital
appreciation  that may be present,  from time to time, in  particular  countries
throughout the world.
This Prospectus  sets forth  concisely the  information  about the Series that a
prospective investor should know before investing.  Additional information about
the  Series  and the Fund has  been  filed  with  the  Securities  and  Exchange
Commission. The Statement of Additional Information is incorporated by reference
into this Prospectus and may be obtained, without charge, by writing to the Fund
or by calling  800-874-3733.  Ask for "Part B of the Prospectus -- The Statement
of Additional  Information." The date of this Prospectus and of the Statement of
Additional Information is March __, 1998.

PROSPECTUS
Investors should read and retain this Prospectus.  Shareholder  inquiries should
be made in  writing to the Fund or by  calling  800-821-5129.  You can also make
inquiries through your broker-dealer.
Shares of the  Series are not  deposits  or  obligations  of, or  guaranteed  or
endorsed by, any bank,  and the shares are not federally  insured by the Federal
Deposit Insurance  Corporation,  the Federal Reserve Board, or any other agency.
An  investment  in the Series  involves  risks,  including  the possible loss of
principal.

CONTENTS

        1       Investment Objective    2

        2       Fee Table       2

        3       How We Invest   3

        4       Purchases       7

        5       Shareholder Services    15

        6       Our Management  16

        7       Dividends, Capital Gains
                Distributions and Taxes 16

        8       Redemptions     17

        9       Performance     18

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

1 INVESTMENT OBJECTIVE

Our  investment  objective  is high  current  income and the  opportunity  for
capital  appreciation  to produce a high total  return.  We seek to achieve this
objective through a  professionally-managed  portfolio  consisting  primarily of
convertible and debt securities,  many of which are  lower-rated,  as well as by
investing at least 20% of our assets in any  combination  of  investment  grade,
U.S. Government or other sovereign state debt securities and cash equivalents. 

2 FEE TABLE

A summary of the Series'  expenses is set forth in the table below.  The example
should not be considered a  representation  of past or future  expenses.  Actual
expenses may be greater or less than those shown.
<TABLE>
<CAPTION>


                                             Class A        Class B                       Class C
                                             Shares         Shares                        Shares
<S>                                          <C>            <C>                           <C>
SHAREHOLDER TRANSACTION EXPENSES(1) 
(AS A PERCENTAGE OF OFFERING PRICE) 
Maximum Sales Load(2) on Purchases
(See "Purchases")                            4.75%          None                          None

Deferred Sales Load(2) (See "Purchases")     None           5% if shares are redeemed     1% if shares
                                                            before 1st anniversary        are redeemed
                                                            of purchase, declining        before 1st anniversary
                                                            to 1% before 6th              of purchase
                                                            anniversary and
                                                            eliminated on and
                                                            after 6th anniversary(3)

ANNUAL FUND OPERATING EXPENSES(4)
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees (See "Our Management")       0.50%          0.50%                         0.50%
12b-1 Fees (See "Purchases")(1)(2)           0.25%          1.00%                         1.00%
Other Expenses (See "Our Management")        0.30%          0.30%                         0.30%
Total Operating Expenses                     1.05%          1.80%                         1.80%



EXAMPLE:Assume  an  annual  return  of 5% and there is no change in the level of
expenses  described above.  For a $1,000  investment,  with  reinvestment of all
dividends  and  distributions,  you  would  pay the  following  total  expenses,
assuming  redemption on the last day of each period indicated.  

                              1 year    3 years   5 years     10 years 
<S>                           <C>       <C>       <C>         <C>   
Class A shares                $58       $79       $103          $170 
Class B  shares(3)            $68       $87       $117          $192  
Class C shares                $28       $57        $97          $212  

EXAMPLE:  You would pay the following expenses on the same investment,  assuming
no redemption:

                              1 year    3 years   5 years   10 years  
<S>                           <C>       <C>       <C>       <C>

Class A shares                $58       $79       $103        $170 
Class B  shares(3)            $18       $57        $97        $192
Class C shares                $18       $57        $97        $212
<FN>

(1)  Although the Fund does not, with respect to the Class B and Class C shares,
     charge a front-end sales charge,  investors  should be aware that long-term
     shareholders  may pay, under the Rule 12b-1 plans applicable to the Class B
     and Class C shares of the Fund (both of which pay annual 0.25%  service and
     0.75% distribution  fees), more than the economic equivalent of the maximum
     front-end  sales  charge as  permitted  by  certain  rules of the  National
     Association of Securities Dealers,  Inc. Likewise,  with respect to Class A
     shares,  investors  should be aware that,  over the long term, such maximum
     may be  exceeded  due to the Rule 12b-1 plan  applicable  to Class A shares
     which  permits the Fund to pay up to 0.50% in total annual  fees,  half for
     service and the other half for distribution.

(2)  Sales  "load" is referred to as sales  "charge,"  "deferred  sales load" is
     referred to as  "contingent  deferred  sales charge" (or "CDSC") and "12b-1
     fees"  which  consist  of a  "service  fee"  and a  "distribution  fee" are
     referred to by either or both of these terms where appropriate with respect
     to Class A, Class B and Class C shares throughout this Prospectus.

(3)  Class B shares will  automatically  convert to Class A shares on the eighth
     anniversary of the purchase of Class B shares.

(4)  The annual  operating  expenses shown in the summary are based on estimated
     expenses  for the current  fiscal year.  

The  foregoing  is provided  to give  investors  a better  understanding  of the
expenses that are incurred by an investment in the Fund.

</FN>
</TABLE>

<PAGE>

3 HOW WE INVEST

We believe that a high total return  (current  income and capital  appreciation)
may be derived from an actively-managed, diversified debt-security portfolio. We
seek unusual values,  particularly in lower-rated debt securities, some of which
are convertible into common stocks or have warrants to purchase common stocks.

Higher yield on debt  securities  can occur during periods of inflation when the
demand for  borrowed  funds is high.  Also,  buying  lower-rated  bonds when the
credit risk is above  average but, we think,  to offer good value,  can generate
higher  yields.  Such debt  securities  normally  will  consist of secured  debt
obligations of the issuer (i.e.,  bonds),  general unsecured debt obligations of
the issuer (i.e., debentures) and debt securities which are subordinate in right
of payment to other debt of the issuer.

Capital appreciation potential is an important consideration in the selection of
portfolio  securities.  Capital  appreciation is sought by (1) investing in debt
securities  when  the  trend  of  interest  rates is  expected  to be down;  (2)
investing in  convertible  debt  securities  or debt  securities  with  warrants
attached  entitling the holder to purchase  common  stock;  and (3) investing in
debt securities of issuers in financial  difficulties when, in our opinion,  the
problems giving rise to such difficulties can be successfully  resolved,  with a
consequent  improvement in the credit standing of the issuers.  Such investments
involve corresponding risks that interest and principal payments may not be made
if such difficulties are not resolved.  In no event will we invest more than 10%
of our gross assets at the time of  investment in debt  securities  which are in
default as to interest or principal.

Under normal circumstances,  we invest at least 65% of our total assets in bonds
and/or  debentures.  Also, under normal  circumstances  our total assets will be
invested in securities,  primarily traded in at least three different countries,
including the United States (the "guideline").  Except for this guideline, there
are neither  limitations  on how much of the  Series'  assets can be invested in
securities  primarily traded in any one country, nor is there a requirement that
the securities of each issuer held by the Series be primarily traded in the same
three  countries.  However,  this  guideline  may not be followed for  temporary
defensive periods when Fund management  (hereinafter meaning the officers of the
Fund subject to the direction of the Fund's Board of Trustees with the advice of
Lord,  Abbett & Co.,  hereinafter  "Lord Abbett") believes that it should invest
entirely in domestic securities or in securities  primarily traded in fewer than
three such countries or in equity or short-term debt securities.

If the Board of Trustees  determines that the change will benefit  shareholders,
the  following  investment  policies are subject to change by the Board  without
shareholder  approval:  (a) we must  keep at least 20% of the value of our total
assets in (1) debt securities  which,  at the time of purchase,  are "investment
grade," i.e., rated within one of the four highest grades  determined  either by
Moody's Investors Service, Inc. or Standard & Poor's Ratings Services,  (2) debt
securities  issued or  guaranteed by the U.S.  Government  or another  sovereign
state  or its  agencies  or  instrumentalities,  (3)  cash or  cash  equivalents
(short-term obligations of banks,  corporations,  the U.S. Government or another
sovereign state), or (4) a combination of any of the foregoing; (b) while we may
invest our gross assets, at market value, in debt securities primarily traded in
foreign  countries -- such foreign debt  securities  normally will be limited to
issues where there does not appear to be  substantial  risk of  nationalization,
exchange controls, confiscation or other government restrictions; (c) subject to
the percentage limitations for purchases of other than debt securities described
below, we may purchase common and preferred stocks;  (d) we may hold or sell any
property or  securities  which we may obtain  through the exercise of conversion
rights or warrants  or as a result of any  reorganization,  recapitalization  or
liquidation  proceedings  for any issuer of securities  owned by us. In no event
will we voluntarily  purchase any securities other than debt securities,  if, at
the  time of such  purchase  or  acquisition,  the  value  of the  property  and
securities,  other than debt securities, in our portfolio is greater than 35% of
the value of our gross assets.  A purchase or acquisition will not be considered
"voluntary"  if made in order to avoid  loss in value of a  conversion  or other
premium;  and (e) we neither purchase securities for short-term trading, nor for
the purpose of exercising control of management.
<PAGE>

We may invest up to 15% of our net assets in  illiquid  securities.  Bonds which
are subject to legal or contractual  restrictions on resale, but which have been
determined  by the Board of Trustees  to be liquid,  will not be subject to this
limit.  Investment by the Series in such securities,  initially determined to be
liquid,  could have the effect of diminishing the level of the Series' liquidity
during periods of decreased market interest in such securities.

The Series may purchase U.S. Government or other sovereign state securities on a
when-issued  basis and,  while  awaiting  delivery  and  before  paying for them
("settlement"),  normally  may invest in  short-term  U.S.  Government  or other
sovereign state securities.  The Series does not start earning interest on these
when-issued  securities  until  settlement  and  often  they are  sold  prior to
settlement.  While this investment  strategy may contribute  significantly  to a
portfolio  turnover  rate  substantially  in excess of 100%, it has little or no
transaction costs or adverse tax consequences for the Series.  Transaction costs
normally do not include  brokerage  because the Series'  fixed-income  portfolio
transactions usually are on a principal basis and, at the time of purchase,  the
Series normally anticipates that any markups charged will be more than offset by
the anticipated economic benefits of the transaction.  During the period between
purchase and  settlement,  the value of the securities will fluctuate and assets
consisting  of cash and/or  marketable  securities  marked to market daily in an
amount  sufficient  to make  payment at  settlement  will be  segregated  at our
custodian in order to pay for the commitment. There is a risk that market yields
available at settlement may be higher than yields obtained on the purchase date,
which could result in depreciation of value.

The other debt  securities in which the Series may invest  include,  but are not
limited to, domestic and foreign,  fixed and  floating-rate  notes,  convertible
securities, certificates, warrants, commercial paper, and principal and interest
pass-throughs issued by governments,  authorities,  partnerships,  corporations,
trust companies,  banks and bank holding  companies,  and banker's  acceptances,
certificates of deposit,  time deposits and deposit notes issued by domestic and
foreign banks.

OTHER INVESTMENT POLICIES AND TECHNIQUES

COUNTRY  DIVERSIFICATION.  Subject to the guideline described above with respect
to investing in at least three different countries, including the United States,
the Series may invest its assets in securities which are primarily traded in the
countries throughout the world.

FOREIGN  CURRENCY  HEDGING  TECHNIQUES.  The Series may utilize  various foreign
currency hedging techniques  described below when Fund management  believes that
the currency of a particular  foreign  country may suffer a decline  against the
U.S. dollar.

A forward foreign currency contract involves an obligation to purchase or sell a
specific  amount of a currency at a set price on a future  date.  The Series may
enter into forward foreign  currency  contracts (but not in excess of the amount
the Series has invested in non-U.S.  dollar-denominated  securities  at the time
any such contract is entered into) in primarily two  circumstances.  First, when
the  Series  enters  into a  contract  for the  purchase  or sale of a  security
denominated in a foreign  currency,  the Series may desire to "lock in" the U.S.
dollar price of a security. By entering into a forward contract for the purchase
or sale of the amount of foreign  currency  involved in the underlying  security
transaction,  the  Series  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 of purchase or
sale and the date of settlement.

Second,  the  Series  may enter  into a forward  contract  to sell the amount of
foreign currency approximating the value of some or all of the Series' portfolio
securities  denominated  in such foreign  currency or, in the  alternative,  the
Series may use a cross-currency-hedging  technique whereby it enters into such a
forward contract to sell another currency (obtained in exchange for the currency
in which the portfolio  securities are  denominated if such securities are sold)
which it expects to decline in a similar manner. Precise matching of the forward
contract and the value of the securities involved will generally not 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 the contract
matures.  The Series  intends to enter into such  forward  contracts  under this
second circumstance periodically. The Series also may enter into forward foreign
currency contracts which are non-deliverable .
<PAGE>

The Series also may transact in currency put and call options on U.S.  exchanges
or U.S.  over-the-counter  markets ("OTC") to protect the dollar against foreign
currency exposure. A put option gives the Series, 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.  The premiums paid for
such  currency  put and call options will not exceed 5% of the net assets of the
Series.

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 and banks  trade  options  which are more  flexible  than  exchange-listed
options  with  respect to strike  price and  maturity  date.  These OTC  options
generally are  available on a wider range of  currencies.  OTC  foreign-currency
options  generally  are more liquid  than listed  options and involve the credit
risk associated with the individual  issuer.  OTC options together with illiquid
securities may comprise no more than 15% of the Series' net assets.

A currency  call option,  upon payment of a premium,  gives the purchaser of the
option the right to buy and the seller  (writer) of the  obligation to sell, the
underlying  currency at the exercise  price until the  expiration of the option.
The Series' purchase of a call option on a currency might be intended to protect
the Series against an increase in the price of the  underlying  currency that it
intends to purchase  in the future by fixing the price at which it may  purchase
such currency.  The Series may sell (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 (as
well as the  cross-hedging  described  above) may not exceed 90% of the value of
the  securities  denominated  in such  currency (a) invested in by the Series to
cover such call writing or (b) to be crossed.

Limitations  imposed  by the  Internal  Revenue  Code  on  regulated  investment
companies may restrict the Series' ability to engage in transactions in options,
forward contracts and cross hedges.

The Series will segregate cash or permitted liquid  securities  belonging to the
Series in an amount not less than that  required  by SEC  Release  10666 and SEC
staff  interpretations  thereof with respect to the Series' assets  committed to
(a) currency put and call options,  (b) forward foreign  currency  contracts and
(c) cross  hedges  entered  into by the Series.  If the value of the  securities
segregated declines,  additional cash or permitted 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 Series'  commitments  with respect to such  options,
forward foreign currency contracts and cross hedges.

BORROWING.  The  Series  may borrow  from  banks (as  defined in the  Investment
Company  Act of 1940,  as  amended,  the  "Act") in amounts up to 33 1/3% of its
total assets  (including  the amount  borrowed).  The Series may borrow up to an
additional  5% of its total assets for temporary  purposes,  and may obtain such
short-term  credit as may be necessary  for the clearance of purchases and sales
of portfolio securities.

DIVERSIFICATION.  The Series  intends to meet the  diversification  rules  under
Subchapter M of the Internal Revenue Code. Generally,  this requires, at the end
of each quarter of the taxable  year,  that (a) not more than 25% of the Series'
total  assets be invested  in any one issuer and (b) with  respect to 50% of the
Series' total assets, no more than 5% of the Series' total assets be invested in
any one issuer, except U.S. Government  securities.  Since under these rules the
Series,  may invest its assets in the securities of a limited number of issuers,
the value of the Series'  investments may be more affected by any single adverse
economic, political or regulatory occurrence than in the case of a "diversified"
investment company under the Act .

RISK AND VOLATILITY REDUCTION. The Series intends to utilize, from time to time,
one or more of the investment  techniques  identified below. While some of these
techniques involve risk when utilized independently,  Fund management intends to
use them to reduce risk and volatility in the Series'  portfolio,  although this
result cannot be assured.
<PAGE>

COVERED CALL OPTIONS.  The Series may sell call options on securities it owns. A
call option on securities  gives the purchaser of the option,  upon payment of a
premium  to the  seller of the  option,  the  right to call  upon the  seller to
deliver a specified security on or before a fixed date at a predetermined price.

RIGHTS AND  WARRANTS.  The Series may invest 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, of a
different  class,  or of a  different  issuer,  as the  case  may  be.  Warrants
represent  the privelege 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 if they are
not exercised prior to their expiration date.

REPURCHASE  AGREEMENTS.  The Series may enter into  repurchase  agreements  with
respect to a security.  A  repurchase  agreement is a  transaction  by which the
Series acquires a security and simultaneously commits to resell that security to
the  seller  (a  bank  or  securities  dealer)  at an  agreed-upon  price  on an
agreed-upon   date.   Such   repurchase   agreement   must,  at  all  times,  be
collateralized by cash or U.S. Government securities having a value equal to, or
in excess of, the value of the repurchase agreement.

OTHER POLICIES.  The Series may engage in any one of the acitivities pursuant to
the policies identified below.

CLOSED-END INVESTMENT  COMPANIES.  The Series may invest in shares of closed-end
investment  companies if bought in the primary or secondary market with a fee or
commission no greater than the  customary  broker's  commission.  Shares of such
investment  companies  sometimes  trade at a discount  or premium in relation to
their net asset value and there may be duplication of fees, for example,  to the
extent  that the Series and the  closed-end  investment  company  both  charge a
management  fee.  No more than 5% of the  Series'  net assets may be invested in
shares of closed-end investment companies.

LENDING OF PORTFOLIO  SECURITIES.  We may engage in the lending of our portfolio
securities.  These  loans may not exceed 30% of the value of the  Series'  total
assets.  In such an arrangement,  the Series loans securities from its portfolio
to registered broker-dealers.  Such loans are continuously  collateralized by an
amount at least equal to 100% of the market value of the securities loaned. Cash
collateral  is  invested  in  obligations  issued  or  guaranteed  by  the  U.S.
Government or its agencies,  commercial  paper or bond  obligations  rated AA or
A-1/P-1  by  Standard & Poor's  Rating  Services  ("S&P")  or Moody's  Investors
Services, Inc. ("Moody's"),  respectively, or repurchase agreements with respect
to the foregoing.  As with other extensions of credit,  there are risks of delay
in recovery  and market loss should the  borrowers of the  portfolio  securities
fail financially.

RISK  FACTORS.  HIGH YIELD DEBT  SECRITIES----We  may  invest  substantially  in
lower-rated  bonds  because  they tend to have higher  yields.  In general,  the
market for lower-rated  bonds is more limited than that for  higher-rated  bonds
and,  therefore,  may be less liquid.  Market  prices of  lower-rated  bonds may
fluctuate  more  than  those of  higher-rated  bonds,  particularly  in times of
economic  change and stress.  In  addition,  because the market for  lower-rated
corporate debt securities has in past years experienced wide fluctuations in the
values of  certain  of these  securities,  past  experience  may not  provide an
accurate indication of the future performance of that market or of the frequency
of default,  especially during periods of recession.  Objective pricing data for
lower-rated bonds may be more limited than for higher-rated  bonds and valuation
of such  securities  may be more  difficult  and require  greater  reliance upon
judgment.

While the market for lower-rated bonds may be relatively insensitive to interest
rate  changes,  the market  prices of these bonds  structured  as zero coupon or
pay-in-kind  securities  may be affected to a greater extent by such changes and
thus may be more volatile than prices of lower-rated  securities paying interest
periodically in cash.  Lower-rated bonds that are callable prior to maturity may
be more  susceptible  to refunding  during  periods of falling  interest  rates,
requiring replacement with lower-yielding securities.

Since the risk of default  generally  is higher  among  lower-rated  bonds,  the
research  and  analysis  performed  by Lord,  Abbett & Co.  ("Lord  Abbett") are
<PAGE>

especially important in the selection of such bonds. If bonds are rated BB/Ba or
lower,  they are  described as  "high-yield  bonds"  because of their  generally
higher yields and are referred to  colloquially as "junk bonds" because of their
greater risks. In selecting  lower-rated bonds for investment,  Lord Abbett does
not rely upon ratings, which evaluate only the safety of principal and interest,
not market value risk, and which,  furthermore,  may not  accurately  reflect an
issuer's current financial condition. We do not have any minimum rating criteria
for our  investments in bonds.  Some issuers may default as to principal  and/or
interest  payments  subsequent  to our  purchase  of their  securities.  Through
portfolio  diversification,  good  credit  analysis  and  attention  to  current
developments  and trends in interest rates and economic  conditions,  investment
risk can be reduced, although there is no assurance that losses will not occur.

Laws enacted from time to time could limit the tax or other  advantages  of, and
the  issuance  of,  lower-rated  securities  and could  adversely  affect  their
secondary  market and the  financial  condition of their  issuers.  On the other
hand, such  legislation  (curtailing the supply of new issues) could improve the
liquidity, market values and demand for outstanding issues.

FOREIGN  SECURITIES--Securities markets of foreign countries in which the Series
may invest  generally  are not subject to the same degree of  regulation  as the
U.S.  markets  and may be more  volatile  and less  liquid  than the major  U.S.
markets.  Lack of liquidity  may affect the Series'  ability to purchase or sell
large  blocks of  securities  and thus obtain the best price.  There may be less
publicly-available   information  on   publicly-traded   companies,   banks  and
governments in foreign countries than generally is the case for such entities in
the United States. The lack of uniform accounting  standards and practices among
countries impairs the validity of direct comparisons of valuation measures (such
as  price/earnings   ratios)  for  securities  in  different  countries.   Other
considerations include political and social instability,  expropriation,  higher
transaction  costs,  withholding  taxes that  cannot be passed  through as a tax
credit  or  deduction  to  shareholders,  currency  fluctuations  and  different
securities  settlement  practices.  Settlement  periods for foreign  securities,
which are sometimes longer than those for securities of U.S. issuers, may affect
portfolio liquidity.  In addition,  foreign securities held by the Series may be
traded on days that the Series does not value its portfolio securities,  such as
Saturdays and customary  business  holidays  and,  accordingly,  the Series' net
asset values may be significantly affected on days when shareholders do not have
access to the Fund.

PORTFOLIO TURNOVER. The portfolio turnover rate for the Series is expected to be
within a range from 100% to 150%. See the  discussion of when-issued  securities
under "How We Invest" as to why this will have little or no transaction  cost or
adverse tax consequences for the Series.

CHANGE OF  INVESTMENT  OBJECTIVE  AND  POLICIES.  The Series will not change its
investment objective without shareholder approval. If the Series determines that
its objective can best be achieved by a change in investment policy or strategy,
it may make such change  without  shareholder  approval by  disclosing it in its
prospectus.

4 PURCHASES

ALTERNATIVE SALES ARRANGEMENTS

CLASSES OF SHARES.  The  Series  offers  investors  three  different  classes of
shares.  The  different  classes  of shares  represent  investments  in the same
portfolio of  securities  but are subject to different  expenses and will likely
have different  share prices.  Investors  should read this section  carefully to
determine which class represents the best investment option for their particular
situation.

CLASS A SHARES.  If you buy Class A shares,  you pay an initial  sales charge on
investments  of less than $1 million (or on investments  for  employer-sponsored
retirement  plans under the Internal  Revenue Code  (hereinafter  referred to as
"Retirement Plans") with less than 100 eligible employees or on investments that
do not qualify to be under a "special  retirement  wrap  program"  defined under
"Class A Share Net Asset Value Purchases" below). If you purchase Class A shares
as part of an investment of at least $1 million (or for Retirement Plans with at
<PAGE>

least 100 eligible  employees or under a "special  retirement  wrap program") in
shares of one or more Lord  Abbett-sponsored  funds, you will not pay an initial
sales  charge,  but if you redeem any of those shares within 24 months after the
month in which you buy them,  you may pay to the  Series a  contingent  deferred
sales charge ("CDSC") of 1% except for redemptions  under a "special  retirement
wrap program." Class A shares are subject to service and distribution  fees that
are currently estimated to total annually approximately 0.25 of 1% of the annual
net asset value of the Class A shares.  The initial sales charge rates, the CDSC
and the Rule 12b-1 plan  applicable  to the Class A shares are  described  under
"General" below.

CLASS B SHARES.  If you buy Class B shares,  you pay no sales charge at the time
of  purchase,  but if you redeem your  shares  before the sixth  anniversary  of
buying them, you will normally pay a CDSC to Lord Abbett  Distributor LLC ("Lord
Abbett  Distributor").  That CDSC varies  depending  on how long you own shares.
Class B shares are subject to service and distribution fees at an annual rate of
1% of the  annual net asset  value of the Class B shares.  The CDSC and the Rule
12b-1 plan applicable to the Class B shares are described under "General" below.

CLASS C SHARES.  If you buy Class C shares,  you pay no sales charge at the time
of  purchase,  but if you redeem your  shares  before the first  anniversary  of
buying them,  you will  normally pay the Series a CDSC of 1%. Class C shares are
subject to service and  distribution  fees at an annual rate of 1% of the annual
net  asset  value of the  Class C  shares.  The CDSC  and the  Rule  12b-1  plan
applicable to the C shares are described under "General" below.

WHICH CLASS OF SHARES  SHOULD YOU CHOOSE?  Once you decide that the Series is an
appropriate  investment  for you,  the  decision  as to which class of shares is
better  suited to your needs  depends  on a number of  factors  which you should
discuss with your financial adviser. The Series' class-specific expenses and the
effect of the different  types of sales charges on your  investment  will affect
your investment  results over time. The most important  factors are how much you
plan to invest and how long you plan to hold your investment.  If your goals and
objectives  change over time and you plan to  purchase  additional  shares,  you
should  re-evaluate those factors to see if you should consider another class of
shares.

In the following discussion, to help provide you and your financial adviser with
a framework in which to choose a class,  we have made some  assumptions  using a
hypothetical investment in the Series. We used the sales charge rates that apply
to Class A, Class B and Class C shares,  and considered the effect of the higher
distribution  fees on Class B and  Class C  expenses  (which  will  affect  your
investment  return). Of course, the actual performance of your investment cannot
be predicted and will vary, based on the Series' actual investment returns,  the
operating  expenses  borne by each class of shares,  and the class of shares you
purchase.  The factors briefly discussed below are not intended to be investment
advice,  guidelines  or  recommendations,   because  each  investor's  financial
considerations are different. The discussion below of the factors to consider in
purchasing a particular  class of shares assumes that you will purchase only one
class of shares and not a combination of shares of different classes.

HOW LONG DO YOU EXPECT TO HOLD YOUR  INVESTMENT?  While future  financial  needs
cannot be  predicted  with  certainty,  knowing how long you expect to hold your
investment  will assist you in selecting the  appropriate  class of shares.  For
example,  over time, the reduced sales charges available for larger purchases of
Class A shares may offset the effect of paying an initial  sales  charge on your
investment,  compared to the effect over time of higher class-specific  expenses
on Class B or Class C shares for which no initial sales charge is paid.  Because
of the effect of  class-based  expenses,  your choice  should also depend on how
much you plan to invest.

INVESTING FOR THE SHORT TERM. If you have a short-term  investment horizon (that
is,  you plan to hold your  shares  for not more  than six  years),  you  should
probably  consider  purchasing  Class A or Class C shares  rather  than  Class B
shares.  This is because of the effect of the Class B CDSC if you redeem  before
the sixth  anniversary  of your  purchase,  as well as the effect of the Class B

<PAGE>

distribution  fee on the  investment  return for that  class in the short  term.
Class C shares might be the  appropriate  choice  (especially for investments of
less than $100,000), because there is no initial sales charge on Class C shares,
and the CDSC does not apply to amounts  you redeem  after  holding  them for one
year.

However,  if you plan to invest more than $100,000 for the short term,  then the
more you invest and the more your investment horizon increases toward six years,
the more  attractive  the Class A share  option may become.  This is because the
annual  distribution  fee on Class C shares  will have a greater  impact on your
account over the longer term than the reduced  front-end sales charge  available
for  larger  purchases  of Class A shares.  For  example,  Class A might be more
appropriate  than Class C for  investments of more than $100,000  expected to be
held for 5 or 6 years (or more).  For investments  over $250,000  expected to be
held 4 to 6 years (or more),  Class A shares may become  more  appropriate  than
Class C shares. If you are investing $500,000 or more, Class A shares may become
more desirable as your investment horizon approaches 3 years or more.

For most investors who invest $1 million or more, or for  Retirement  Plans with
at least  100  eligible  employees  or for  investments  pursuant  to a  special
retirement  wrap  program,  in most  cases  Class  A  shares  will  be the  most
advantageous choice, no matter how long you intend to hold your shares. For that
reason,  it may not be  suitable  for you to place a purchase  order for Class B
shares of $500,000 or more or a purchase  order for Class C shares of $1,000,000
or more. In addition, it may not be suitable for you to place an order for Class
B or C shares for a Retirement Plan with at least 100 eligible  employees or for
a special  retirement wrap program.  You should discuss this with your financial
advisor.

INVESTING  FOR THE LONGER TERM.  If you are  investing  for the longer term (for
example,  to provide  for future  college  expenses  for your  child) and do not
expect to need access to your money for seven years or more,  Class B shares may
be an appropriate investment option if you plan to invest less than $100,000. If
you plan to invest more than  $100,000  over the long term,  Class A shares will
likely be more  advantageous than Class B shares or Class C shares, as discussed
above,  because of the effect of the expected  lower expenses for Class A shares
and the reduced initial sales charges available for larger  investments in Class
A shares under the Series' rights of accumulation.

Of course,  these examples are based on  approximations of the effect of current
sales charges and expenses on a  hypothetical  investment  over time, and should
not be relied on as rigid guidelines.

ARE THERE  DIFFERENCES  IN ACCOUNT  FEATURES  THAT MATTER TO YOU?  Some  account
features  are  available  in whole or in part to  Class A,  Class B and  Class C
shareholders.  Other features (such as Systematic Withdrawal Plans) might not be
advisable in non-Retirement  Plan accounts for Class B shareholders  (because of
the effect of the CDSC on the entire  amount of a  withdrawal  if it exceeds 12%
annually) and in any account for Class C  shareholders  during the first year of
share  ownership  (due  to the  CDSC  on  withdrawals  during  that  year).  See
"Systematic  Withdrawal Plan" under "Shareholder  Services" for more information
about the 12%  annual  waiver of the CDSC with  respect  to Class B shares.  You
should  carefully  review  how you plan to use your  investment  account  before
deciding  which class of shares you buy. For example,  the dividends  payable to
Class B and Class C shareholders will be reduced by the expenses borne solely by
each of these classes,  such as the higher distribution fee to which Class B and
Class C shares are subject, as described below.

HOW DOES IT AFFECT PAYMENTS TO MY BROKER?  A salesperson,  such as a broker,  or
any other  person who is entitled  to receive  compensation  for selling  Series
shares may receive different compensation for selling one class than for selling
another class. As discussed in more detail below, such compensation is primarily
paid at the time of sale in the case of  Class A and B shares  and is paid  over
time, so long as shares remain outstanding, in the case of Class C shares. It is
important that investors understand that the primary purpose of the CDSC for the

<PAGE>

Class B shares  and the  distribution  fee for Class B and Class C shares is the
same as the purpose of the front-end sales charge on sales of Class A shares: to
compensate  brokers and other persons selling such shares. The CDSC, if payable,
supplements  the Class B  distribution  fee and reduces the Class C distribution
fee expenses for the Fund and Class C shareholders.

GENERAL

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 it
to World Bond-Debenture Series of Lord Abbett Securities Trust (P.O. Box 419100,
Kansas City,  Missouri 64141). The minimum initial investment is $1,000,  except
for  Invest-A-Matic  and Div-Move ($250 initial and $50 subsequent  minimum) and
Individual Retirement Accounts ($250 minimum).  For Retirement Plans there is no
minimum initial investment required. See "Shareholder Services." For information
regarding  the proper form of a purchase or redemption  order,  call the Fund at
800-821-5129.  This offering may be suspended, changed or withdrawn. Lord Abbett
Distributor reserves the right to reject any order.

The net asset value of our shares is  calculated  every  business  day as of the
close of the New York Stock  Exchange  ("NYSE")  by  dividing  net assets by the
number of shares  outstanding.  Securities  are valued at their  market value as
more fully described in the Statement of Additional Information.

BUYING  SHARES  THROUGH  YOUR DEALER.  Orders for shares  received by the Series
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 the  applicable  public  offering  price  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 applicable  public  offering price 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.

Lord Abbett Distributor may, for specified periods,  allow dealers to retain the
full sales charge for sales of shares during such periods,  or pay an additional
concession to a dealer who,  during a specified  period,  sells a minimum dollar
amount of our shares and/or shares of other Lord Abbett-sponsored funds. In some
instances,  such additional  concessions will be offered only to certain dealers
expected to sell  significant  amounts of shares.  Lord Abbett  Distributor may,
from time to time, implement promotions under which Lord Abbett Distributor will
pay a fee to dealers with respect to certain purchases not involving  imposition
of  a  sales  charge.   Additional   payments  may  be  paid  from  Lord  Abbett
Distributor's  own  resources  and  will  be made in the  form  of cash  or,  if
permitted,  non-cash  payments.  The non-cash  payments  will  include  business
seminars at resorts or other locations,  including meals and  entertainment,  or
the receipt of  merchandise.  The cash payments will include  payment of various
business  expenses  of the dealer.  In  selecting  dealers to execute  portfolio
transactions  for the Series'  portfolio,  if two or more dealers are considered
capable of obtaining best  execution,  we may prefer the dealer who has sold our
shares and/or shares of other Lord Abbett-sponsored funds.

BUYING  CLASS A  SHARES.  The  offering  price of Class A shares is based on the
per-share  net asset value next  computed  after your order is  accepted  plus a
sales charge as follows.

                         SALES CHARGE AS A        DEALER'S
                         PERCENTAGE OF:           CONCESSION
                                                     AS A            TO COMPUTE
                                        NET       PERCENTAGE          OFFERING
                        OFFERING        AMOUNT    OF OFFERING      PRICE, DIVIDE
SIZE OF INVESTMENT      PRICE           INVESTED     PRICE             NAV BY

Less than $50,000       4.75%           4.99%       4.00%             .9525
$50,000 to $99,999      4.75%           4.99%       4.25%             .9525
$100,000 to $249,999    3.75%           3.90%       3.25%             .9625
$250,000 to $499,999    2.75%           2.83%       2.50%             .9725
$500,000 to $999,999    2.00%           2.04%       1.75%             .9800
$1,000,000 or more      No Sales Charge             1.00%+           1.0000

+Authorized  institutions  receive concessions on purchases made by a retirement
plan,  pursuant to a special  retirement  wrap  program or by another  qualified
purchaser  within a 12-month  period  (beginning  with the first net asset value
purchase) as follows:  1.00% on  purchases  of $5 million,  0.55% of the next $5
million,  0.50% of the next $40 million and 0.25% on purchases over $50 million.
See "Class A Rule 12b-1 Plan" below.

<PAGE>

CLASS A SHARE VOLUME  DISCOUNTS.  This section describes several ways to qualify
for a lower  sales  charge  when  purchasing  Class A shares if you inform  Lord
Abbett  Distributor  or the Fund that you are  eligible at the time of purchase.
(1) Any purchaser (as described below) may aggregate a Class A share purchase in
the Series with any share purchases of any other eligible Lord  Abbett-sponsored
fund, together with the current value at maximum offering price of any shares in
the  Series  and  in  any  eligible  Lord  Abbett-sponsored  funds  held  by the
purchaser.  (Holdings  in the  following  funds are not  eligible  for the above
rights of  accumulation:  Lord Abbett Equity Fund  ("LAEF"),  Lord Abbett Series
Fund  ("LASF"),  any  series of Lord  Abbett  Research  Fund not  offered to the
general public ("LARF") and Lord Abbett U.S. Government  Securities Money Market
Fund  ("GSMMF"),  except for  holdings  in GSMMF which are  attributable  to any
shares exchanged from a Lord Abbett-sponsored  fund.) (2) A purchaser may sign a
non-binding  13-month  statement of intention to invest  $100,000 or more in any
shares of the  Series or in any of the above  eligible  funds.  If the  intended
purchases  are  completed  during the period,  the total amount of your intended
purchases  of any shares will  determine  the reduced  sales charge rate for the
Class A shares purchased during the period. If not completed, each Class A share
purchase  will be at the sales  charge for the  aggregate  of the  actual  share
purchases. Shares issued upon reinvestment of dividends or distributions are not
included in the statement of  intention.  The term  "purchaser"  includes (i) an
individual,  (ii) an individual and his or her spouse and children under the age
of 21 and (iii) a trustee  or other  fiduciary  purchasing  shares  for a single
trust estate or single fiduciary account  (including a pension,  profit-sharing,
or other  employee  benefit  trust  qualified  under Section 401 of the Internal
Revenue  Code -- more  than one  qualified  employee  benefit  trust of a single
employer,  including its consolidated  subsidiaries,  may be considered a single
trust, as may qualified plans of multiple employers  registered in the name of a
single bank  trustee as one  account),  although  more than one  beneficiary  is
involved.

CLASS A SHARE NET ASSET VALUE PURCHASES.  Our Class A shares may be purchased at
net asset value by our  directors,  employees of Lord  Abbett,  employees of our
shareholder  servicing  agent and  employees of any  securities  dealer having a
sales  agreement with Lord Abbett  Distributor who consents to such purchases or
by the trustee or custodian under any pension or profit-sharing  plan or Payroll
Deduction IRA  established for the benefit of such persons or for the benefit of
any national  securities trade  organization to which Lord Abbett or Lord Abbett
Distributor  belongs or any company with an  account(s) in excess of $10 million
managed by Lord Abbett on a private-advisory-account basis. For purposes of this
paragraph,  the  terms  "directors"  and  "employees"  include a  director's  or
employee's  spouse  (including  the surviving  spouse of a deceased  director or
employee).  The terms  "directors"  and  "employees of Lord Abbett" also include
other family  members and retired  directors and  employees.  Our Class A shares
also may be  purchased  at net asset  value (a) at $1 million or more;  (b) with
dividends  and  distributions  on Class A shares of other Lord  Abbett-sponsored
funds,  except for dividends and distributions on shares of LARF, LAEF and LASF;
(c) under the loan feature of the Lord  Abbett-sponsored  prototype  403(b) plan
for  Class A  share  purchases  representing  the  repayment  of  principal  and
interest;  (d) by certain authorized  brokers,  dealers,  registered  investment
advisers or other financial institutions who have entered into an agreement with
Lord Abbett  Distributor in accordance with certain  standards  approved by Lord
Abbett Distributor,  providing specifically for the use of our Class A shares in
particular  investment  products  made  available  for a fee to  clients of such
brokers,   dealers,   registered   investment   advisers  and  other   financial
institutions ("mutual fund wrap fee programs");  (e) by employees,  partners and
owners of  unaffiliated  consultants  and advisers to Lord  Abbett,  Lord Abbett
Distributor or Lord Abbett-sponsored  funds who consent to such purchase if such
persons provide services to Lord Abbett,  Lord Abbett  Distributor or such funds
on a continuing  basis and are familiar with such fund;  (f) through  Retirement
Plans with at least 100 eligible  employees;  (g) through a "special  retirement
wrap  program"  sponsored  by an  authorized  institution  having  one  or  more

<PAGE>

characteristics  distinguishing  it, in the opinion of Lord  Abbett  Distributor
from a mutual fund wrap fee program. Such characteristics  include,  among other
things, the fact that an authorized  institution does not charge its clients any
fee of a consulting or advisory  nature that is  economically  equivalent to the
distribution  fee  under a Class A 12b-1  Plan  and the fact  that  the  program
relates to participant-directed Retirement Plans.

CLASS A RULE 12B-1 PLAN. We have adopted a Class A share Rule 12b-1 Plan (the "A
Plan") which authorizes the payment of fees to authorized  institutions  (except
as to certain  accounts for which  tracking  data is not  available) in order to
provide additional incentives for them (a) to provide continuing information and
investment  services to their Class A  shareholder  accounts  and  otherwise  to
encourage  those accounts to remain invested in the Series and (b) to sell Class
A shares of the  Series.  Under the A Plan,  in order to save on the  expense of
shareholders'  meetings and to provide flexibility to the Board of Trustees, the
Board,  including  a majority of the outside  trustees  who are not  "interested
persons" of the Fund as defined in the Act, is authorized to approve  annual fee
payments  from our Class A assets of up to 0.50 of 1% of the average net of such
assets  consisting of  distribution  and service fees,  each at a maximum annual
rate not exceeding 0.25 of 1% (the "Fee Ceiling").

Under the A Plan,  the Board has approved  payments by the Series to Lord Abbett
Distributor  which uses or passes on to  authorized  institutions  (1) an annual
service fee (payable  quarterly) of .25% of the average daily net asset value of
the  Class A shares  serviced  by  authorized  institutions  and (2) a  one-time
distribution fee of up to 1% (reduced according to the following schedule: 1% of
the first $5 million,  .55% of the next $5 million, .50% of the next $40 million
and .25% over $50  million),  payable  at the time of sale on all Class A shares
sold during any  12-month  period  starting  from the day of the first net asset
value sale (i) at the $1 million  level by  authorized  institutions,  including
sales qualifying at such level under the rights of accumulation and statement of
intention  privileges;  (ii) through Retirement Plans with at least 100 eligible
employees or (iii)  constituting new sales pursuant to a special retirement wrap
program  and  excluding  exchanges  into the Series  under  such a  program.  In
addition,  the  Board  has  approved  for those  authorized  institutions  which
qualify,  a supplemental  annual  distribution fee equal to 0.10% of the average
daily net asset value of the Class A shares serviced by authorized  institutions
which have a satisfactory program for the promotion and retention of such shares
satsifying  Lord  Abbett  Distributor.   Class  A  shares  held  pursuant  to  a
satisfacotry program would, for example, (i) constitute a significant percentage
of the Fund's net asests,  (ii) be held for a substantial  length of time and/or
(iii)  have a lower than  average  redemption  rate.  Institutions  and  persons
permitted by law to receive such fees are "authorized institutions."

Under the A Plan, Lord Abbett  Distributor is permitted to use payments received
to provide continuing  services to Class A shareholder  accounts not serviced by
authorized  institutions and, with Board approval, to finance any activity which
is primarily intended to result in the sale of Class A shares. Any such payments
are subject to the Fee Ceiling.  Any  payments  under that Plan not used by Lord
Abbett Distributor in this manner are passed on to authorized institutions.

Holders of Class A shares on which the 1% sales  distribution  fee has been paid
may be  required  to pay to the Series on behalf of its Class A shares a CDSC of
1% of the original  cost or the then net asset value,  whichever is less, of all
Class A shares so purchased which are redeemed out of the Lord  Abbett-sponsored
family of funds on or before the end of the twenty-fourth  month after the month
in which the purchase  occurred.  (Exceptions  are made for: (i)  redemptions by
Retirement  Plans  due to any  benefit  payment  such  as Plan  loans,  hardship
withdrawals,  death,  retirement or separation from service with respect to plan
participants  or  the  distribution  of  any  excess   contributions   and  (ii)
participant  directed  redemptions  which  continue  as program  investments  in
another fund participating in a special retirement wrap program.) If the Class A
shares have been  exchanged  into  another  Lord  Abbett-sponsored  fund and are
thereafter  redeemed out of the Lord Abbett family of funds on or before the end
of such twenty-fourth  month, the charge will be collected for the Series' Class
A shares by the other fund. The Series will collect such a charge for other Lord
Abbett-sponsored funds in a similar situation.
<PAGE>

BUYING  CLASS B SHARES.  Class B shares  are sold at net  asset  value per share
without an initial  sales  charge.  However,  if Class B shares are redeemed for
cash before the sixth anniversary of their purchase, a CDSC may be deducted from
the redemption proceeds. That sales charge will not apply to shares purchased by
the reinvestment of dividends or capital gains distributions. The charge will be
assessed  on the  lesser  of the net  asset  value of the  shares at the time of
redemption  or the  original  purchase  price.  The Class B CDSC is paid to Lord
Abbett Distributor to compensate it for its services rendered in connection with
the distribution of Class B shares, including the payment and financing of sales
commissions. See "Class B Rule 12b-1 Plan" below.

To determine whether the CDSC applies to a redemption, the Series redeems shares
in the following  order:  (1) shares  acquired by  reinvestment of dividends and
capital  gains  distributions,  (2) shares held until the sixth  anniversary  of
their  purchase  or later,  and (3)  shares  held the  longest  before the sixth
anniversary of their purchase.

The amount of the CDSC will depend on the number of years since you invested and
the dollar amount being redeemed, according to the following schedule.

Anniversary
of the Day on            Contingent Deferred
Which the Purchase       Sales Charge on
Order Was Accepted       Redemptions
                         (As % of Amount
On        Before         Subject to Charge)
          1st            5.0%
1st       2nd            4.0%
2nd       3rd            3.0%
3rd       4th            3.0%
4th       5th            2.0%
5th       6th            1.0%
on or after the          None
6th anniversary


In the table,  an  "anniversary"  is the 365th day subsequent to a purchase or a
prior  anniversary.  All  purchases  are  considered  to have  been  made on the
business  day the  purchase was made.  See "Buying  Shares  Through Your Dealer"
above.

If  Class  B  shares  are  exchanged   into  the  same  class  of  another  Lord
Abbett-sponsored  fund and the new shares  are  subsequently  redeemed  for cash
before the sixth anniversary of the original purchase,  the CDSC will be payable
on the new shares on the basis of the time elapsed  from the original  purchase.
The Series will collect such a charge for other Lord Abbett-sponsored funds in a
similar situation.

WAIVER OF CLASS B SALES CHARGES.  The Class B CDSC will not be applied to shares
purchased in certain types of transactions  nor will it apply to shares redeemed
in certain circumstances as described below.

The Class B CDSC will be waived for redemptions of shares (i) in connection with
the  Systematic  Withdrawal  Plan and  Div-Move  services,  as described in more
detail under  "Shareholder  Services" below; (ii) by Retirement Plans due to any
benefit payment such as Plan loans, hardship withdrawals,  death,  retirement or
separation from service with respect to plan participants or the distribution of
any excess contributions; (iii) in connection with mandatory distributions under
403(b) plans and individual retirement accounts; and (iv) in connection with the
death of the shareholder.

CLASS B RULE 12B-1 PLAN.  The Series has adopted a Class B share Rule 12b-1 Plan
(the "B Plan") under which the Series  periodically pays Lord Abbett Distributor
(i) an annual  service fee of 0.25 of 1% of the average daily net asset value of
the  Class B shares  and (ii) an  annual  distribution  fee of 0.75 of 1% of the
average  daily net asset  value of the Class B shares that are  outstanding  for
less than 8 years.

Lord  Abbett   Distributor  uses  the  service  fee  to  compensate   authorized
institutions  (except  as to certain  accounts  for which  tracking  data is not
available)  for  providing  personal  services  for  accounts  that hold Class B
shares. Those services are similar to those provided under the A Plan, described
above.

Lord Abbett  Distributor  pays an up-front  payment to  authorized  institutions
totalling 4%,  consisting of 0.25% for service and 3.75% for a sales  commission
as described below.

<PAGE>

Lord Abbett Distributor pays the 0.25% service fee to authorized institutions in
advance for the first year after Class B shares have been sold by the authorized
institutions.  After  the  shares  have  been  held  for  a  year,  Lord  Abbett
Distributor pays the service fee on a quarterly basis.  Lord Abbett  Distributor
is entitled to retain such service fee payable  under the B Plan with respect to
accounts  for which there is no  authorized  institution  of record or for which
such authorized  institution  did not qualify.  Although not obligated to do so,
Lord Abbett  Distributor may waive receipt from the Series of part or all of the
service fee payments.

The  0.75%  annual  distribution  fee is  paid  to Lord  Abbett  Distributor  to
compensate it for its services  rendered in connection with the  distribution of
Class B shares,  including  the  payment  and  financing  of sales  commissions.
Although Class B shares are sold without a front-end  sales charge,  Lord Abbett
Distributor pays authorized institutions responsible for sales of Class B shares
a sales  commission of 3.75% of the purchase price.  This payment is made at the
time of sale from Lord Abbett Distributor's own resources.  Lord Abbett has made
arrangements to finance these commission  payments,  which arrangements  include
non-recourse  assignments by Lord Abbett  Distributor to the financing  party of
such distribution and CDSC payments concerning Class B shares.

The  distribution  fee and CDSC payments  described above allow investors to buy
Class B shares  without a front-end  sales  charge  while  allowing  Lord Abbett
Distributor to compensate authorized  institutions that sell Class B shares. The
CDSC is intended to supplement Lord Abbett  Distributor's  reimbursement for the
commission  payments it has made with  respect to Class B shares and its related
distribution  and financing  costs. The distribution fee payments are at a fixed
rate and the CDSC payments are of a nature that,  during any year, both forms of
payment may not be  sufficient  to  reimburse  Lord Abbett  Distributor  for its
actual  expenses.  The Series is not liable for any  expenses  incurred  by Lord
Abbett Distributor in excess of (i) the amount of such distribution fee payments
to be received by Lord Abbett  Distributor  and (ii)  unreimbursed  distribution
expenses of Lord Abbett  Distributor  incurred in a prior plan year,  subject to
the right of the Board of Directors  or  shareholders  to terminate  the B Plan.
Over the long term, the expenses incurred by Lord Abbett  Distributor are likely
to be greater than such distribution fee and CDSC payments.  Nevertheless, there
exists a possibility  that for a short-term  period Lord Abbett  Distributor may
not have  sufficient  expenses  to  warrant  reimbursement  by  receipt  of such
distribution fee payments.  Although Lord Abbett  Distributor does not intend to
make a profit under the B Plan,  the B Plan is  considered a  compensation  plan
(i.e.,  distribution fees are paid regardless of expenses  incurred) in order to
avoid the  possibility  of Lord  Abbett  Distributor  not being  able to receive
distribution fees because of a temporary timing difference between its incurring
expenses and receipt of such distribution fees.

AUTOMATIC  CONVERSION  OF CLASS B  SHARES.  On the  eighth  anniversary  of your
purchase of Class B shares,  those shares will automatically  convert to Class A
shares.  This  conversion  relieves  Class B  shareholders  of the higher annual
distribution  fee that  applies  to Class B shares  under the Class B Rule 12b-1
Plan.  The  conversion  is based on the  relative  net  asset  values of the two
classes,  and no sales  charge or other  charge is imposed.  When Class B shares
convert,  any other Class B shares that were  acquired  by the  reinvestment  of
dividends  and  distributions  will also convert to Class A shares on a pro rata
basis.  The conversion  feature is subject to the continued  availability  of an
opinion of counsel or a tax ruling  described  in  "Purchases,  Redemptions  and
Shareholder Services" in the Statement of Additional Information.

BUYING  CLASS C SHARES.  Class C shares  are sold at net  asset  value per share
without an initial  sales  charge.  However,  if Class C shares are redeemed for
cash  before  the  first  anniversary  of their  purchase,  a CDSC of 1% will be
deducted from the redemption proceeds.  That reimbursement charge will not apply
to  shares   purchased  by  the  reinvestment  of  dividends  or  capital  gains
distributions.  The charge will be assessed on the lesser of the net asset value
of the shares at the time of  redemption  or the original  purchase  price.  The
Class C CDSC is paid to the Series to reimburse it, in whole or in part, for the
service and distribution fee payments made by the Series at the time such shares
were sold, as described below.
<PAGE>

To determine whether the CDSC applies to a redemption, the Series redeems shares
in the following  order:  (1) shares  acquired by  reinvestment of dividends and
capital gains distributions, (2) shares held for one year or more and (3) shares
held the longest  before the first  anniversary  of their  purchase.  If Class C
shares are exchanged into the same class of another Lord  Abbett-sponsored  fund
and  subsequently  redeemed  before  the  first  anniversary  of their  original
purchase,  the  charge  will be  collected  by the other  fund on behalf of this
Series'  Class C shares.  The Series will  collect  such a charge for other Lord
Abbett-sponsored funds in a similar situation.

CLASS C RULE 12B-1 PLAN.  The Series has adopted a Class C share Rule 12b-1 Plan
(the "C Plan") under which  (except as to certain  accounts  for which  tracking
data is not  available)  the Series pays  authorized  institutions  through Lord
Abbett  Distributor (1) a service fee and a distribution fee, at the time shares
are sold,  not to  exceed  0.25 and 0.75 of 1%,  respectively,  of the net asset
value of such shares and (2) at each quarter-end  after the first anniversary of
the sale of shares,  fees for services and  distribution  at annual rates not to
exceed 0.25 and 0.75 of 1%  respectively,  of the average annual net asset value
of such shares  outstanding  (payments  with  respect to shares not  outstanding
during the full quarter to be prorated). These service and distribution fees are
for purposes  similar to those mentioned above with respect to the A Plan. Sales
in clause (1) exclude shares issued for reinvested  dividends and  distributions
and  shares  outstanding  in clause (2)  include  shares  issued for  reinvested
dividends and distributions after the first anniversary of their issuance.

5 SHAREHOLDER SERVICES

We offer the following shareholder services:

TELEPHONE  EXCHANGE  PRIVILEGE:  Shares of any class may be exchanged  without a
service   charge:   (a)  for  shares  of  the  same  class  of  any  other  Lord
Abbett-sponsored  fund except for (i) LAEF,  LASF and Mid-Cap Series of LARF and
(ii) certain tax-free, single-state series where the exchanging shareholder is a
resident  of a state in which such  series is not  offered  for sale and (b) for
shares of any authorized  institution's  affiliated money market fund satisfying
Lord  Abbett  Distributor  as to  certain  omnibus  account  and other  criteria
(together, "Eligible Funds").

You or YOUR REPRESENTATIVE WITH PROPER IDENTIFICATION can instruct the Series to
exchange  uncertificated  shares  of a class  (held by the  transfer  agent)  by
telephone.  Shareholders  have this privilege  unless they refuse it in writing.
The  Series  will not be  liable  for  following  instructions  communicated  by
telephone that it reasonably  believes to be genuine and will employ  reasonable
procedures  to  confirm  that  instructions  received  are  genuine,   including
requesting  proper   identification  and  recording  all  telephone   exchanges.
Instructions must be received by the Series in Kansas City (800-821-5129)  prior
to the close of the NYSE to obtain  each  fund's net asset value per class share
on that day.  Expedited  exchanges by telephone may be difficult to implement in
times of drastic economic or market change. The exchange privilege should not be
used to take advantage of short-term  swings in the market.  The Series reserves
the right to  terminate  or limit the  privilege  of any  shareholder  who makes
frequent  exchanges.  The Series can revoke the privilege  for all  shareholders
upon  60  days'  prior  written   notice.   A  prospectus  for  the  other  Lord
Abbett-sponsored  fund  selected  by you should be  obtained  and read before an
exchange.  Exercise  of the  exchange  privilege  will be  treated as a sale for
federal income tax purposes and, depending on the circumstances,  a capital gain
or loss may be recognized.

SYSTEMATIC WITHDRAWAL PLAN ("SWP"):  Except for Retirement Plans for which there
is no such minimum,  if the maximum offering price value of your  uncertificated
shares is at least $10,000, you may have periodic cash withdrawals automatically
paid to you in either fixed or variable amounts. With respect to Class B shares,
the CDSC will be waived on  redemptions of up to 12% per year of the current net
asset  value of your  account at the time your SWP is  established.  For Class B
shares (over 12% per year) and C shares,  redemption  proceeds due to a SWP will
be derived from the following  sources in the order listed:  (1) shares acquired
by reinvestment of dividends and capital gains, (2) shares held for six years or
more  (Class B) or one year or more  (Class C); and (3) shares  held the longest
before the sixth  anniversary  of their  purchase  (Class B) or before the first
anniversary of their purchase (Class C). For Class B share  redemptions over 12%

<PAGE>

per year,  the CDSC  will  apply to the  entire  redemption.  Therefore,  please
contact the Series for  assistance  in  minimizing  the CDSC in this  situation.
Shareholders  should be careful in establishing a SWP,  especially to the extent
that such a withdrawal  exceeds the annual  total  return for a class,  in which
case, the shareholder's  original  principal will be invaded and, over time, may
be depleted.

DIV-MOVE:  You can invest the  dividends  paid on your account ($250 initial and
$50  subsequent  minimum) into an existing  account within the same class in any
Eligible Fund. The account must be either your account,  a joint account for you
and your  spouse,  a single  account for your spouse or a custodial  account for
your minor child under the age of 21. Such  dividends are not subject to a CDSC.
You should read the prospectus of any other fund before investing.

INVEST-A-MATIC:  You can make fixed,  periodic investments ($250 initial and $50
subsequent  minimum)  into  the  Series  and/or  any  Eligible  Fund by means of
automatic money transfers from your bank checking  account.  You should read the
prospectus of the other fund before investing.

RETIREMENT  PLANS:  Lord  Abbett  makes  available   retirement  plan  documents
including 401(k) plans and custodial agreements for IRAs (Individual  Retirement
Accounts including SIMPLE IRAs and Simplified Employee  Pensions),  403(b) plans
and pension and profit-sharing plans.

HOUSEHOLDING:  A single copy of an annual or semi-annual  report will be sent to
an address to which more than one registered  shareholder of the Series with the
same last name has indicated mail is to be delivered,  unless additional reports
are specifically requested in writing or by telephone.

All correspondence should be directed to the World Bond-Debenture Series of Lord
Abbett  Securities  Trust  (P.O.  Box  419100,   Kansas  City,  Missouri  64141;
800-821-5129).

6 OUR MANAGEMENT

Our business is managed by our officers on a day-to-day  basis under the overall
direction  of our Board of Trustees  with the advice of Lord  Abbett.  We employ
Lord Abbett as  investment  manager  pursuant to a  Management  Agreement.  Lord
Abbett has been an investment  manager for over 67 years and  currently  manages
approximately  $25  billion  in a family  of mutual  funds  and  other  advisory
accounts.  Under  the  Management  Agreement,   Lord  Abbett  provides  us  with
investment  management  services and  executive  and other  personnel,  pays the
remuneration of our officers and trustees affiliated with Lord Abbett,  provides
us with office  space and pays for ordinary  and  necessary  office and clerical
expenses  relating to research,  statistical work and supervision of the Series'
portfolio  and certain other costs.  Lord Abbett  provides  similar  services to
twelve other Lord  Abbett-sponsored  funds having various investment  objectives
and also advises other investment clients.

We pay Lord  Abbett a monthly  fee,  based on average  daily net assets for each
month. For the first fiscal year of the Series, the fee paid to Lord Abbett as a
percentage  of average  daily net assets is expected to be at the annual rate of
 .50%. In addition, we pay all expenses not expressly assumed by Lord Abbett.

THE FUND.-.  The Fund was organized as a Delaware business trust on February 26,
1993. The Series is a non-diversified  open-end  management  investment company.
Its Class A, B and C shares have equal  rights as to voting,  dividends,  assets
and  liquidation  except for differences  resulting from certain  class-specific
expenses.

7 DIVIDENDS, CAPITAL GAINS DISTRIBUTIONS AND TAXES

Our net  investment  income is paid to  shareholders  quarterly  as a  dividend.
Dividends may be taken in cash or  reinvested in additional  shares at net asset
value without a sales charge.

If you  elect a cash  payment  (i) a  check  will  be  mailed  to you as soon as
possible after the quarterly reinvestment date or (ii) if you arrange for direct
deposit, your payment will be wired directly to your bank account within one day
after the date on which the dividend is paid.
<PAGE>

A long-term  capital gains  distribution is made when we have net profits during
the year from sales of  securities  which we have held more than one year. If we
realize net short-term capital gains, they also will be distributed. Any capital
gains  distribution  are expected to be paid in  November.  You may take them in
cash or reinvest  them in  additional  shares at net asset value without a sales
charge.

Dividends  and  distributions  declared in October,  November or December of any
year to  shareholders of record as of a date in such a month will be treated for
federal income tax purposes as having been received by shareholders in that year
if they are paid before February 1 of the following year.

We intend to continue to meet the  requirements  of Subchapter M of the Internal
Revenue Code. We will try to distribute to  shareholders  all our net investment
income and net  realized  capital  gains,  so as to avoid the  necessity  of the
Series paying federal income tax.  Shareholders,  however, must report dividends
and capital gains  distributions as taxable income.  Dividends  derived from the
Series'  ordinary  income  and net  short-term  capital  gains  are  taxable  to
Shareholders  at ordinary  income  rates.  Distributions  by the Fund of any net
long-term  capital gains will be taxable to a shareholder  as long-term  capital
gains regardless of how long the shareholder has held the shares. Under recently
enacted legislation,  the maximum tax rate on long-term capital gains for a U.S.
individual, estate or trust is reduced to 20% for distributions derived from the
sale of assets  held more than 18  months.  (If the  taxpayer  is in the 15% tax
bracket,  the rate is 10%.) For  distributions  derived  from the sale of assets
held between 12 and 18 months,  the tax rate remains at 28% (15% if the taxpayer
is in the 15% tax bracket).

Shareholders may be subject to a $50 penalty under the Internal Revenue Code and
we may be required to withhold and remit to the U.S. Treasury a portion (31%) of
any redemption  proceeds  (including the value of shares  exchanged into another
Lord Abbett-sponsored fund), and of any dividend or distribution on any account,
where  the  payee   (shareholder)   failed   to   provide  a  correct   taxpayer
identification number or to make certain required certifications.

We will  inform  shareholders  of the federal  tax status of each  dividend  and
distribution  after the end of each calendar year.  Shareholders  should consult
their tax advisers concerning applicable state and local taxes as well as on the
tax  consequences  of gains or losses  from the  redemption  or  exchange of our
shares

8 REDEMPTIONS

To obtain the proceeds of an  expedited  redemption  of $50,000 or less,  you or
YOUR  REPRESENTATIVE  WITH PROPER  IDENTIFICATION  can telephone the Series. The
Series will not be liable for following  instructions  communicated by telephone
that it reasonably believes to be genuine and will employ reasonable  procedures
to confirm that instructions  received are genuine,  including requesting proper
identification,  recording  all telephone  redemptions  and mailing the proceeds
only  to  the  named  shareholder  at  the  address  appearing  on  the  account
registration.

If you do not qualify for the expedited  procedures  described  above, to redeem
shares directly, send your request to World Bond-Debenture Series of Lord Abbett
Securities   Trust  (P.O.  Box  419100,   Kansas  City,   Missouri  64141)  with
signature(s)  and any legal capacity of the signer(s)  guaranteed by an eligible
guarantor,  accompanied by any  certificates for shares to be redeemed and other
required  documentation.  We will make  payment  of the net  asset  value of the
shares on the date the  redemption  order was received in proper  form.  Payment
will be made  within  three  days.  The Series may  suspend  the right to redeem
shares for not more than seven days (or longer under  unusual  circumstances  as
permitted by Federal  law).  If you have  purchased  Series  shares by check and
subsequently submit a redemption request,  redemption proceeds will be paid upon
clearance of your purchase check,  which may take up to 15 days. To avoid delays
you may arrange for the bank upon which a check was drawn to  communicate to the
Series that the check has cleared.  Shares also may be redeemed by the Series at
net asset value through your securities  dealer who, as an unaffiliated  dealer,

<PAGE>

may charge you a fee. If your dealer  receives  your order prior to the close of
the NYSE and communicates it to Lord Abbett, as our agent, prior to the close of
Lord Abbett's business day, you will receive the net asset value as of the close
of the NYSE on that day.  If the dealer  does not  communicate  such an order to
Lord Abbett until the next business day, you will receive the net asset value as
of the close of the NYSE on that next business day.

Shareholders  who have redeemed  their shares have a one-time right to reinvest,
in another  account having the identical class and  registration,  in any of the
Eligible Funds at the then applicable net asset value (i) without the payment of
a front-end sales charge or (ii) with reimbursement for the payment of any CDSC.
Such  reinvestment  must be made within 60 days of the redemption and is limited
to no more than the amount of the redemption proceeds.

Under certain  circumstances  and subject to prior written notice,  our Board of
Trustees may  authorize  redemption of all of the shares in any account in which
there are fewer than 25 shares.

TAX-QUALIFIED   PLANS:  For  redemptions  of  $50,000  or  less,  follow  normal
redemption  procedures.  Redemptions  over  $50,000  must be in writing from the
employer,  broker or plan  administrator  stating the reason for the redemption.
The reason  for the  redemption  must be  received  by the  Series  prior to, or
concurrent with, the redemption request.

9 PERFORMANCE

YIELD AND TOTAL  RETURN.  Yield and total return data may, from time to time, be
included in advertisements about the Series. Each class of shares calculates its
"yield"  by  dividing  the  annualized  net  investment  income per share on the
portfolio  during a 30-day period by the maximum  offering price on the last day
of the  period.  The yield of each class will  differ  because of the  different
expenses  (including actual 12b-1 fees) of each class of shares.  The yield data
represents  a  hypothetical  investment  return on the  portfolio,  and does not
measure an investment  return based on dividends  actually paid to shareholders.
To show that return, a dividend distribution rate may be calculated.  A dividend
distribution  rate is  calculated  by dividing the  dividends of a class derived
from net investment  income during a stated period by the maximum offering price
on the last day of the  period.  The yield and  dividend  distribution  rate for
Class A shares  reflect the deduction of the maximum  initial sales charge,  but
may also be shown based on the  Series'  net asset  value per share.  Yields for
Class B and Class C shares do not reflect the deduction of the CDSC.

"Total return" for the one-, five- and ten-year  periods  represents the average
annual compounded rate of return on an investment of $1,000 in the Series at the
maximum public offering  price.  When total return is quoted for Class A shares,
it includes the payment of the maximum  initial sales charge.  When total return
is  shown  for  Class B and  Class C  shares,  it  reflects  the  effect  of the
applicable  CDSC.  Total return also may be presented for other periods or based
on investments at reduced sales charge levels or net asset value.  Any quotation
of total return not reflecting the maximum sales charge  (front-end,  level,  or
back-end)  would be reduced if such sales charge were used.  Quotations of yield
or total return for any period when an expense  limitation  is in effect will be
greater than if the limitation had not been in effect. See "Past Performance" in
the Statement of Additional Information for a more detailed description.

The Series' dividend  distribution  rate may differ from its SEC yield primarily
because  the  Series  may  purchase  short-  and  intermediate-term  high-coupon
securities  at a  premium  and,  consistent  with  applicable  tax  regulations,
distribute  to  shareholders  all of the  interest  income  on these  securities
without  amortizing  the premiums.  This practice also is used by the Series for
financial  statement  purposes  and is in  accordance  with  generally  accepted
accounting  principles.  In other words, the Series may pay more than face value
for a  security  that  pays a  greater-than-market  rate of  interest  and  then
distribute all such interest as dividends. The principal payable on the security
at maturity will equal face value,  and so the market value of the security will
gradually  decrease  to face  value,  assuming  no change in the market  rate of
interest or in the credit quality of the issuer.  Shareholders  should recognize
that such  dividends  therefore will tend to decrease the net asset value of the

<PAGE>

Series.  Dividends paid from this interest income are taxable to shareholders at
ordinary income rates.

The Series may make  distributions in excess of net investment  income from time
to time to provide more stable dividends.  Such distributions could cause slight
decreases in net asset value over time, but historically  have not resulted in a
return of capital for tax purposes.

See "Performance" in the Statement of Additional Information for a more detailed
discussion concerning the computation of the Series' total return and yield.

THIS  PROSPECTUS  DOES NOT CONSTITUTE AN OFFERING IN ANY  JURISDICTION  IN WHICH
SUCH OFFER IS NOT  AUTHORIZED  OR IN WHICH THE PERSON  MAKING  SUCH OFFER IS NOT
QUALIFIED TO DO SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER.

NO PERSON IS AUTHORIZED TO GIVE ANY  INFORMATION OR TO MAKE ANY  REPRESENTATIONS
NOT CONTAINED IN THIS PROSPECTUS OR IN SUPPLEMENTAL SALES MATERIAL AUTHORIZED BY
THE  FUND  AND  NO  PERSON  IS  ENTITLED  TO  RELY  UPON  ANY   INFORMATION   OR
REPRESENTATION NOT CONTAINED HEREIN OR THEREIN.


INVESTMENT MANAGER AND UNDERWRITER
Lord, Abbett & Co. and Lord Abbett Distributor LLC
The General Motors Building
767 Fifth Avenue
New York, New York 10153-0203
212-848-1800

CUSTODIAN
The Bank of New York
48 Wall Street
New York, New York 10286

TRANSFER AGENT AND DIVIDEND
DISBURSING AGENT
United Missouri Bank of Kansas City, N.A.
Tenth and Grand
Kansas City, Missouri 64141

SHAREHOLDER SERVICING AGENT
DST Systems, Inc.
P.O. Box 419100
Kansas City, Missouri 64141
800-821-5129

AUDITORS
Deloitte & Touche LLP

COUNSEL
Debevoise & Plimpton

Printed in the U.S.A.

LABD-1-597

(5/97)

LORD ABBETT
SECURITIES TRUST
THE GENERAL MOTORS BUILDING
767 FIFTH AVENUE
NEW YORK, NY 10153-0203

LORD ABBETT
PROSPECTUS '98
MARCH ___, 1998
                    Application Inside

LORD ABBETT
SECURITIES
TRUST
WORLD BOND-DEBENTURE 
SERIES


LORD, ABBETT & CO.
INVESTMENT MANAGEMENT
A TRADITION OF PERFORMANCE THROUGH DISCIPLINED INVESTING
<PAGE>
LORD ABBETT                                                    March     , 1998
Statement of Additional Information


                          Lord Abbett Securities Trust
                           World-Bond Debenture Series

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 March , 1998.

Lord Abbett Securities Trust (sometimes referred to as the "Fund") was organized
as a Delaware business trust on February 26, 1993. The Fund has four series, but
only World  Bond-Debenture  Series  ("we" or the  "Series") is described in this
Statement of Additional Information.  The Series has three classes of shares (A,
B and C). All Fund  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.  Although no present plans exist to do
so,  further series may be added in the future.  The  Investment  Company Act of
1940, as amended (the "Act"),  requires that where more than one series  exists,
each  series  must be  preferred  over all  other  series in  respect  of assets
specifically allocated to such series.

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 Fund
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 or series affected
by such  matter.  Rule 18f-2  further  provides  that a class or series shall be
deemed to be affected by a matter  unless the  interests of each class or series
in the  matter are  substantially  identical  or the matter  does not affect any
interest of such class or series.  However,  the Rule  exempts the  selection of
independent  public  accountants,  the  approval of a contract  with a principal
underwriter and the election of directors from its separate voting requirements.

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

        TABLE OF CONTENTS                           Page

        1.       Investment Policies                                 2
        2.       Trustees and Officers                               4
        3.       Investment Advisory and Other Services              7
        4.       Portfolio Transactions                              7
        5.       Purchases, Redemptions and
                 Shareholder Services                                9
        6.       Past Performance                                   15
        7.       Taxes                                              16
        8.       Information About the Fund                         17
        9.       Financial Statements                               17
       10.       Appendix                                           18


<PAGE>


                                       1.
                               Investment Policies

FUNDAMENTAL INVESTMENT RESTRICTIONS
We are subject to the following investment  restrictions which cannot be changed
without  approval of a majority of our outstanding  shares.  The Series may not:
(1) borrow  money,  except that (i) the Series may borrow from banks (as defined
in the Investment  Company Act of 1940, as amended (the "Act")) in amounts up to
33 1/3% of its total assets (including the amount borrowed), (ii) the Series may
borrow up to an additional 5% of its total assets for temporary purposes,  (iii)
the  Series  may  obtain  such  short-term  credit as may be  necessary  for the
clearance of purchases and sales of portfolio securities and (iv) the Series 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 Series'  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 the Series 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 the Series 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 the Series 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 the Series, buy securities of one issuer representing more than (i) 5%
of the Series' gross assets,  except securities issued or guaranteed by the U.S.
Government,  its  agencies  or  instrumentalities  or  (ii)  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 changes 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  the  investment
restrictions above which cannot be changed without shareholder approval, we also
are subject to the following  non-fundamental  investment  policies which may be
changed by the Board of Trustees without  shareholder  approval.  The Series may
not: (1) borrow in excess of 33 1/3% of its total  assets,  , 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, deemed to be liquid by the
Board of Directors;  (4) invest in the securities of other investment  companies
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  operations,  if more than 5% of the Series'  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 officers or trustees of the Fund or by one
or more partners or members of the Series'  underwriter or investment adviser if
these owners in the aggregate own beneficially more than 5% of the securities of
such  issuer;  (7)  invest  in real  estate  limited  partnership  interests  or
interests  in  oil,  gas or  other  mineral  leases,  or  exploration  or  other
development programs,  except that the Series may invest in securities issued by
companies  that  engage  in oil,  gas or  other  mineral  exploration  or  other
development  activities;  (8) write,  purchase or sell puts,  calls,  straddles,
spreads or combinations  thereof,  except to the extent permitted in the Series'
prospectus and statement of additional information,  as they may be amended from
time to time; (9) buy from or sell to any of its officers, trustees,  employees,
or  its  investment  adviser  or any of its  officers,  directors,  partners  or
employees,  any securities other than shares of the Series;  or (10) invest more
than 10% of the market  value of its gross assets at the time of  investment  in
debt securities which are in default as to interest or principal.
<PAGE>

PORTFOLIO TURNOVER RATE. For the first year of operation, our portfolio turnover
is expected to be between 100% and 150%.

INVESTMENT TECHNIQUES

The Series intends to utilize,  from time to time, one or more of the investment
techniques described below, including covered call options,  rights and warrants
and  repurchase  agreements.  While some of these  techniques  involve risk when
utilized  independently,  the  Series  intends  to use them to  reduce  risk and
volatility in its portfolios.

COVERED CALL OPTIONS. The Series may write covered call options on securities it
owns ("call  options").  A call option on securities  gives the purchaser of the
option, upon payment of a premium to the writer of the option, the right to call
upon the writer to deliver a  specified  security on or before a fixed date at a
predetermined price.

The  writing  of call  options  will,  therefore,  involve a  potential  loss of
opportunity  to sell  securities at higher  prices.  In exchange for the premium
received.  The writer of a fully  collateralized  call option  gives up the gain
possibility  of the underlying  security  beyond the call price and continues to
have the downside  risk of such  securities.  In  addition,  in exchange for the
premium  received,  the writer of the call gives up the gain  possibility of the
stock  appreciating  above the call price. While an option that has been written
is in force,  the maximum profit that may be derived from the optioned  security
is the  sum of  the  premium  less  brokerage  commissions  and  fees  plus  the
difference  between  the strike  price of the call and the  market  price of the
underlying security.

REPURCHASE  AGREEMENTS.  The Series may enter into  repurchase  agreements  with
respect to a security.  A  repurchase  agreement is a  transaction  by which the
Series acquires a security and simultaneously commits to resell that security to
the  seller  (a  bank  or  securities  dealer)  at an  agreed-upon  price  on an
agreed-upon  date.  The  resale  price  reflects  the  purchase  price  plus  an
agreed-upon  market rate of interest  which is  unrelated  to the coupon rate or
date of maturity of the purchased  security.  In this type of  transaction,  the
securities  purchased by the Series have a total value in excess of the value of
the repurchase  agreement.  The Series requires at all times that the repurchase
agreement be collateralized by cash or U.S. Government securities having a value
equal  to,  or in  excess  of,  the  value  of the  repurchase  agreement.  Such
agreements  permit the Series to keep all of its assets at work while  retaining
flexibility in pursuit of investments of a longer-term nature.

The use of repurchase  agreements  involves certain risks.  For example,  if the
seller of the agreement  defaults on its obligation to repurchase the underlying
securities at a time when the value of these securities has declined, the Series
may incur a loss upon their disposition.  If the seller of the agreement becomes
insolvent and subject to liquidation or reorganization under the Bankruptcy Code
or other laws, a bankruptcy  court may determine that the underlying  securities
are collateral not within the control of the Series and are therefore subject to
sale by the trustee in  bankruptcy.  Even though the  repurchase  agreements may
have maturities of seven days or less,  they may lack  liquidity,  especially if
the issuer  encounters  financial  difficulties.  While the Series  acknowledges
these  risks,  it is  expected  that they can be  controlled  through  stringent
selection  criteria and careful  monitoring  procedures.  The Series  intends to
limit  repurchase   agreements  to  transactions   with  dealers  and  financial
institutions  believed by the Series to present minimal credit risks. The Series
will monitor  creditworthiness of the repurchase agreement sellers on an ongoing
basis.

LENDING PORTFOLIO SECURITIES

The Series may lend its portfolio securities to registered broker-dealers. These
loans,  if and when made,  may not exceed 30% of theSeries'  total  assets.  The
Series'  lending of  securities  will be  collateralized  by cash or  marketable

<PAGE>

securities  issued or guaranteed by the U.S.  Government or its agencies  ("U.S.
Government  securities")  or other  permissible  means.  The cash or instruments
collateralizing  the Series'  lending of  securities  will be  maintained at all
times in an amount at least  equal to the  current  market  value of the  loaned
securities.  From time to time,  the  Series  may  allow a part of the  interest
received with respect to the investment of collateral to be paid to the borrower
and/or a third party that is not  affiliated  with the Series and is acting as a
"placing broker." No fee will be paid to affiliated persons of the Series.

By  lending  portfolio  securities,  the  Series  can  increase  its  income  by
continuing  to receive  interest on the loaned  securities  as well as by either
investing  the  cash  collateral  in  permissible  investments,   such  as  U.S.
Government  securities,  or  obtaining  yield in the form of interest  paid by a
borrower when such U.S. Government securities are used as collateral. The Series
will comply with the following conditions whenever it lends securities:  (i) the
Series  must  receive  at least  100%  collateral  from the  borrower;  (ii) the
borrower  must  increase  the  collateral  whenever  the  market  value  of  the
securities loaned rises above the level of the collateral; (iii) the Series must
be able to  terminate  the  loan at any  time;  (iv)  the  Series  must  receive
reasonable  compensation  with  respect to the loan,  as well as any  dividends,
interest or other distributions on the loaned securities; (v) the Series may pay
only  reasonable fees in connection with the loan; and (vi) voting rights on the
loaned  securities  may pass to the  borrower,  except that if a material  event
adversely  affecting the investment in the loaned securities  occurs, the Fund's
Board of  Trustees  must  terminate  the loan and  regain  the right to vote the
securities.

WHEN-ISSUED TRANSACTIONS

As stated in the Prospectus,  the Series may purchase portfolio  securities on a
when-issued basis.  When-issued  transactions involve a commitment by the Series
to purchase securities,  with payment and delivery  ("settlement") to take place
in the future, in order to secure what is considered to be an advantageous price
or yield at the time of entering  into the  transaction.  When the Series enters
into a when-issued  purchase, it becomes obligated to purchase securities and it
assumes all the rights and risks attendant to ownership of a security,  although
settlement  occurs at a later date. The value of  fixed-income  securities to be
delivered in the future will  fluctuate as interest  rates vary. At the time the
Series makes the  commitment to purchase a security on a when-issued  basis,  it
will record the  transaction  and reflect the liability for the purchase and the
value of the security in determining its net asset value.  The Series  generally
has the ability to close out a purchase  obligation on or before the  settlement
date,  rather than take delivery of the security.  Under no  circumstances  will
settlement for such  securities take place more than 120 days after the purchase
date.



                                       2.
                              Trustees and Officers

The following  trustees are partners of Lord, Abbett & Co. ("Lord Abbett"),  The
General Motors Building,  767 Fifth Avenue, New York, New York 10153-0203.  They
have been  associated with Lord Abbett for over five years and are also officers
and/or  directors or trustees of the twelve other Lord  Abbett-sponsored  funds.
They  are  "interested  persons"  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.


Robert S. Dow, age 53, Chairman and President
E. Wayne Nordberg, age 59, Vice President

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

E. Thayer Bigelow
Courtroom Television Network
600 Third Avenue
New York, New York
<PAGE>

Chief Executive Officer of Courtroom Television Network.  Formerly President and
Chief Executive  Officer of Time Warner Cable  Programming,  Inc. Prior to that,
President and Chief Operating Officer of Home Box Office, Inc. 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 67.

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

Retired. Former Chairman of Independent Election Corporation of America, a proxy
tabulating firm. Age 72.

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,
formerly  Chairman  and  Chief  Executive  Officer  of  Lincoln  Snacks,   Inc.,
manufacturer of branded snack foods (1992-1994). Currently serves as Director of
Den West Restaurant Co., J.B. Williams, and Fountainhead Water Company. Age 64.

Hansel B. Millican, Jr.
Rochester Button Company
1100 Noblin Avenue
South Boston, Virginia

President and Chief Executive Officer of Rochester Button Company.  Age 69.

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

Chairman of Spencer Stuart U.S., an executive search consulting firm. Age 60.

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


<PAGE>


<TABLE>
<CAPTION>



                   FOR THE FISCAL YEAR ENDED OCTOBER 31, 1997
<S>                            <C>                 <C>                      <C>

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

                                                                            For Year Ended
                                                  Equity-Based              December 31, 1997
                                                  Benefits Accrued          Total Compensation
                              Aggregate           By The Fund AndAccrued    By The Fund And
                              Compensation        Twelve Other Lord         Twelve Other Lord
                              Accrued By          Abbett-Sponsored          Abbett-Sponsored
NAME OF DIRECTOR              THE FUND1           FUNDS2                    FUNDS3

E. Thayer Bigelow             $450                $16,641                  $56,000
Stewart S. Dixon              $442                $32,015                  $55,000
John C. Jansing               $442                $46,430                  $55,000
C. Alan MacDonald             $460                $29,994                  $57,400
Hansel B. Millican, Jr.       $446                $38,069                  $55,000
Thomas J. Neff                $449                $18,804                  $56,000

<FN>

1. Outside  trustees'  fees,  including  attendance fees for board and committee
   meetings,  are allocated among all Lord  Abbett-sponsored  funds based on the
   net  assets of each fund.  A portion  of the fees  payable by the Fund to its
   outside  trustees  is being  deferred  under a plan that  deems the  deferred
   amounts to be  invested in shares of the Fund for later  distribution  to the
   trustees. The amounts of the aggregate compensation payable by the Fund as of
   October  31,  1997,  deemed  invested  in Fund  shares,  including  dividends
   reinvested  and  changes  in  net  asset  value  applicable  to  such  deemed
   investments, were: Mr. Bigelow, 939; Mr. Dixon, 21,555; Mr. Jansing, 165,003;
   Mr.  MacDonald,  9,515; Mr.  Millican,  21,626 and Mr. Neff,  22,587.  If the
   amounts deemed  invested in Fund shares were added to each  trustee's  actual
   holdings of Fund shares as of October 31, 1997, each would own the following:
   Mr. Bigelow,  shares; Mr. Dixon, shares; Mr. Jansing,  shares; Mr. MacDonald,
   shares; Mr.    Millican,       shares; Mr. Neff,       shares.

2. Each Lord  Abbett-sponsored fund has a retirement plan providing that outside
   directors(trustees)  may receive annual retirement benefits for life equal to
   100% of their final annual retainers following  retirement at or after age 72
   with at least 10 years of  service.  Each  plan also  provides  for a reduced
   benefit upon early retirement under certain  circumstances,  a pre-retirement
   death benefit and actuarially  reduced  joint-and-survivor  spousal benefits.
   Such retirement  plans,  and the deferred  compensation  plans referred to in
   footnote one, were amended during 1996 to, among other things, enable outside
   directors(trustees)  to elect to convert their prospective benefits under the
   retirement  plans to  equity-based  benefits under the deferred  compensation
   plans (renamed the equity-based  plans and hereinafter  referred to as such).
   Five of the six  outside  directors(trustees)  made  such  an  election.  Mr.
   Jansing  did not.  The amounts  accrued in column 3 were  accrued by the Lord
   Abbett-sponsored  funds for the twelve  months  ended  October  31, 1997 with
   respect to the  equity-based  plans.  Under the 1996  amendments,  the annual
   retainer was  increased to $50,000 and the annual  retirement  benefits  were
   increased from 80% to 100% of a trustee's final annual retainer. Thus, if Mr.
   Jansing were to retire at or after age 72 and the annual retainer  payable by
   the funds were the same as it is today,  he would receive  annual  retirement
   benefits of $50,000.

3. This  column  shows  aggregate  compensation,  including  trustees  fees  and
   attendance fees for board and committee meetings, of a nature referred
    to in footnote one,  accrued by the Lord  Abbett-sponsored  funds during the
year ended December 31, 1997.
</FN>
</TABLE>
<PAGE>

Except where indicated,  the following  executive officers of the Fund have been
associated  with Lord  Abbett for over five  years.  Of the  following,  Messrs.
Allen, Brown, Carper, Ms. Foster, Messrs. Hilstad,  Morris, Noelke, Nordberg and
Walsh are partners of Lord Abbett; the others are employees; Zane Brown, age 46,
Executive Vice President; Paul A. Hilstad, age 55 (with Lord Abbett since 1995 -
formerly  Senior  Vice  President  and  General  Counsel  of  American   Capital
Management & Research,  Inc.),  Vice President and Secretary;  Stephen I. Allen,
age 44; Daniel E. Carper,  age 46; Daria Foster, age 43; Lawrence H. Kaplan, age
41 (with Lord Abbett since 1997 - formerly  Vice  President and Chief Counsel of
Salomon  Brothers Asset Management Inc - 1995 to 1997, prior thereto Senior Vice
President and Associate General Counsel of Kidder,  Peabody & Co. Incorporated);
Thomas F. Konop,  age 55; Robert Noelke,  age 41; E. Wayne Nordberg,  age 59; A.
Edward Oberhaus,  age 38, Keith F. O'Connor, age 42, John J. Walsh, age 62, Vice
Presidents; and Donna M. McManus, age 37, Treasurer.

The Fund  does not hold  annual  meetings  of  shareholders  unless  one or more
matters are  required to be acted on by  shareholders  under the Act.  Under the
Fund's Declaration of Trust,  shareholder  meetings may be called at any time by
certain  officers  of the  Fund or by a  majority  of the  trustees  (i) for the
purpose of taking action upon any matter  requiring the vote or authority of the
Fund'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 Series outstanding and entitled to vote at the meeting.

As of December 26, 1997, Lord,  Abbett & Co. owns all of our shares.  Therefore,
those trustees and officers who are also partners of Lord, Abbett & Co. own as a
group, 100% of our outstanding shares.



                                       3.
                     Investment Advisory and Other Services


As described under "Our Management" in the Prospectus, Lord Abbett is the Fund's
investment  manager.  Ten of the twelve general partners of Lord Abbett,  all of
whom are officers and/or directors of the Fund, are:  Stephen I. Allen,  Zane E.
Brown, Daniel E. Carper, Robert S. Dow, Daria L. Foster, Paul A. Hilstad, Robert
G. Morris,  Robert J.  Noelke,  E. Wayne  Nordberg and John J. Walsh.  The other
general  partners of Lord Abbett who are neither  officers nor  directors of the
Fund are W. Thomas Hudson and Michael McLaughlin. The address of each partner is
The General Motors Building, 767 Fifth Avenue, New York, New York 10153-0203.

The services performed by Lord Abbett are described in the Prospectus under "Our
Management". Under the Management Agreement, we are obligated to pay Lord Abbett
a monthly fee,  based on average daily net assets for each month,  at the annual
rate of .50 of 1% of the Series' average daily net assets. This fee is allocated
among  Classes  A, B and C based on the  classes'  proportionate  shares of such
average daily net assets.

We pay all expenses not  expressly  assumed by Lord Abbett,  including,  without
limitation,  12b-1 expenses,  outside  trustees' 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 Bank of New York ("BNY"),  48 Wall Street, New York, New York, is the Fund's
custodian.  In  accordance  with the  requirements  of Rule  17f-5,  the  Fund's
trustees have approved  arrangements  permitting the Series'  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 10281 are
the  independent  accountants of the Fund and must be approved at least annually
by our Board of  Trustees  to  continue  in such  capacity.  Independent  public
accountants  perform audit  services for the Fund  including the  examination of
financial statements included in our annual report to shareholders.


                                       4.
                             Portfolio Transactions


With respect to the Series,  purchases and sales of portfolio securities usually
will be principal  transactions  and normally such  securities will be purchased
directly  from  the  issuer  or from an  underwriter  or  market  maker  for the
securities.  Therefore, the Series usually will pay no brokerage commissions for
such purchases. Purchases from underwriters of portfolio securities will include
a commission or concession  paid by the issuer to the  underwriter and purchases
from dealers serving as market makers will include a dealer's markup.  Principal
transactions,  including riskless principal  transactions,  are not afforded the
protection of the safe harbor in Section 28 (e) of the  Securities  Exchange Act
of 1934.

<PAGE>

Our policy is to obtain best execution on all our portfolio transactions,  which
means that we seek 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, the Series may pay, as described below, a higher commission than
some  brokers  might  charge on the same  transaction.  This policy  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 the 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.

In  transactions  on stock  exchanges  in the  United  States,  commissions  are
negotiated,  whereas on many foreign stock  exchanges  commissions are fixed. In
the case of  securities  traded in the  foreign  and  domestic  over-the-counter
markets, there is generally no stated commission, but the price usually includes
an undisclosed commission or markup. Purchases from underwriters of newly-issued
securities  for  inclusion  in the  Series'  portfolio  usually  will  include a
concession  paid to the  underwriter  by the issuer and  purchases  from dealers
serving as market  makers  will  include  the spread  between  the bid and asked
prices.  When  commissions  are  negotiated,  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 our 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
Series;  conversely,  such services  furnished in connection  with  brokerage on
other  accounts  managed  by Lord  Abbett may be used in  connection  with their
management of the Series;  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 Fund to purchase or sell the Series' portfolio securities.

<PAGE>

If two or more  broker-dealers are considered capable of offering the equivalent
likelihood of best execution,  the  broker-dealer who has sold our 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 we do, 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 us in the
buying and selling of the same  securities as described  above. If these clients
wish to buy or sell the same security as we do, 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 we do.

We will not seek  "reciprocal"  dealer  business  (for the  purpose of  applying
commissions  in whole or in part for our 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"   and
"Redemptions", respectively.

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 Day,  Presidents' Day,
Good  Friday,  Memorial  Day,  Independence  Day,  Labor Day,  Thanksgiving  and
Christmas.

The Series  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 Fund's  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.  Securities
for which market  quotations  are not  available are valued at fair market value
under procedures approved by the Board of Trustees.

The maximum  offering  price of Class A shares on December 26, 1997 was computed
as follows:

                                                                 CLASS A
Net asset value per share (net assets divided
by shares outstanding)............................................$10.03

Maximum offering price per share (net asset
value divided by .9525)...........................................$10.53

<PAGE>

All assets and  liabilities  expressed in foreign  currencies  will be converted
into United  States  dollars at the mean between the buying and selling rates of
such currencies  against United States dollars last quoted by any major bank. If
such  quotations are not  available,  the rate of exchange will be determined in
accordance  with policies  established by the Board of Trustees of the Fund. The
Board of  Trustees  will  monitor,  on an ongoing  basis,  the Fund's  method of
valuation.

Trading in  securities  on European  and Far Eastern  securities  exchanges  and
over-the-counter markets is normally completed well before the close of business
on  each  business  day  in New  York.  In  addition,  European  or Far  Eastern
securities  trading  generally or in a particular  country or countries  may not
take place on all business days in New York. Furthermore, trading takes place in
various  foreign  markets on days which are not business days in New York and on
which the Series' net asset values are not calculated. Such calculation does not
take  place  contemporaneously  with  the  determination  of the  prices  of the
majority of the portfolio securities used in such calculation.  Events affecting
the values of portfolio  securities that occur between the time their prices are
determined  and the  close of the  NYSE  will not be  reflected  in the  Series'
calculation  of net asset values unless the Fund's  trustees  determine that the
particular  event  would  materially  affect net asset  value,  in which case an
adjustment will be made.

The net asset value per share for the Class B and C shares is  determined in the
same  manner  as  for  the  Class  A  shares  (net  assets   divided  by  shares
outstanding). Our Class B and C shares are offered at net asset value.

The 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 the Series,  and to
make  reasonable  efforts  to sell  Series  shares  so long as,  in Lord  Abbett
Distributor's judgment, a substantial distribution can be obtained by reasonable
efforts.


CONVERSION  OF CLASS B SHARES.  The  conversion  of Class B shares on the eighth
anniversary  of their purchase is subject to the  continuing  availability  of a
private  letter  ruling  from the  Internal  Revenue  Service,  or an opinion of
counsel or tax adviser, to the effect that the conversion of Class B shares does
not  constitute a taxable event for the holder under Federal  income tax law. If
such  a  revenue  ruling  or  opinion  is no  longer  available,  the  automatic
conversion  feature may be suspended,  in which event no further  conversions of
Class B shares would occur while such  suspension  remained in effect.  Although
Class B shares  could  then be  exchanged  for  Class A shares  on the  basis of
relative net asset value of the two classes,  without the  imposition of a sales
charge or fee, such exchange could constitute a taxable event for the holder.

CLASS A, B AND C RULE 12B-1 PLANS.  As described in the  Prospectus,  the Series
has adopted a Distribution Plan and Agreement  pursuant to Rule 12b-1 of the Act
for each of the three  Series  Classes:  the "A  Plan",  the "B Plan" and the "C
Plan", respectively. In adopting each Plan and in approving its continuance, the
Board of Trustees has concluded that there is a reasonable  likelihood that each
Plan will  benefit  its  respective  Class  and such  Class'  shareholders.  The
expected  benefits include greater sales and lower  redemptions of Class shares,
which should allow each Class to maintain a consistent  cash flow,  and a higher
quality  of  service  to  shareholders  by  authorized  institutions  than would
otherwise be the case. Lord Abbett used all amounts received under each Plan for
payments to dealers for (i) providing continuous services to shareholders,  such
as  answering   shareholder   inquiries,   maintaining  records,  and  assisting
shareholders  in  making  redemptions,   transfers,   additional  purchases  and
exchanges and (ii) their assistance in distributing shares of the Fund.

Each Plan requires the trustees to review, on a quarterly basis, written reports
of all amounts  expended  pursuant to the Plan and the  purposes  for which such
expenditures  were  made.  Each  Plan  shall  continue  in  effect  only  if its
continuance is specifically  approved at least annually by vote of the trustees,
including a majority of the trustees who are not interested  persons of the Fund
and who have no direct or indirect  financial  interest in the  operation of the
Plan or in any  agreements  related to the Plan  ("outside  trustees"),  cast in
person at a meeting called for the purpose of voting on the Plan. No Plan may be
amended to  increase  materially  above the limits set forth  therein the amount
spent for distribution expenses thereunder without approval by a majority of the
outstanding  voting  securities  of the  applicable  class and the approval of a
majority of the  trustees,  including a majority of the outside  trustees.  Each
Plan may be terminated at any time by vote of a majority of the outside trustees
or by vote of a majority of its Class's outstanding voting securities.
<PAGE>

CONTINGENT  DEFERRED SALES CHARGES. A Contingent  Deferred Sales Charge ("CDSC")
(i) applies  regardless of class, (ii) will not apply to shares purchased by the
reinvestment of dividends or capital gains distributions; (iii) will be assessed
on the lesser of the net asset value of the shares at the time of  redemption or
the original  purchase  price and (iv) will not be imposed on the amount of your
account  value  represented  by the increase in net asset value over the initial
purchase price  (including  increases due to the  reinvestment  of dividends and
capital gains distributions) and upon early redemption of shares.

CLASS A SHARES.  As stated in the Prospectus,  subject to certain  exceptions ,a
CDSC of 1% is imposed with respect to those Class A shares (or Class A shares of
another Lord  Abbett-sponsored  fund or series acquired through exchange of such
shares) on which the Fund has paid the one-time  distribution  fee of 1% if such
shares are  redeemed out of the Lord  Abbett-sponsored  family of funds within a
period  of 24  months  from  the end of the  month in which  the  original  sale
occurred.

CLASS B SHARES. As stated in the Prospectus,  subject to certain exceptions,  if
Class B shares  (or  Class B shares of  another  Lord  Abbett-sponsored  fund or
series  acquired  through  exchange of such shares) are redeemed out of the Lord
Abbett-sponsored  family of funds for cash before the sixth anniversary of their
purchase, a CDSC will be deducted from the redemption proceeds. The Class B CDSC
is paid to Lord Abbett  Distributor  to reimburse its  expenses,  in whole or in
part, for providing  distribution-related service to the Fund in connection with
the sale of Class B shares.

To determine  whether the CDSC applies to a redemption,  the Fund redeems shares
in the following  order:  (1) shares  acquired by  reinvestment of dividends and
capital gains  distributions,  (2) shares held on or after the sixth anniversary
of  their  purchase,   and  (3)  shares  held  the  longest  before  such  sixth
anniversary.

The amount of the contingent  deferred sales charge will depend on the number of
years since you invested and the dollar amount being redeemed,  according to the
following schedule:

Anniversary of the Day on                    Contingent Deferred Sales Charge
Which the Purchase Order Was Accepted        on Redemptions 
                                             (As % of Amount Subject to Charge)
Before the 1st.........................................5.0%
On the 1st, before the 2nd.............................4.0%
On the 2nd, before the 3rd.............................3.0%
On the 3rd, before the 4th.............................3.0%
On the 4th, before the 5th.............................2.0%
On the 5th, before the 6th ............................1.0%
On or after the 6th anniversary........................None

In the table, an  "anniversary" is the 365th day subsequent to the acceptance of
a purchase  order or a prior  anniversary.  All purchases are considered to have
been made on the business day on which the purchase order was accepted.

CLASS C SHARES.  As stated in the Prospectus,  subject to certain  exceptions if
Class C shares  are  redeemed  for cash  before the first  anniversary  of their
purchase,  the  redeeming  shareholder  will be  required  to pay to the Fund on
behalf of Class C shares a CDSC of 1% of the lower of cost or the then net asset
value of Class C shares  redeemed.  If such shares are  exchanged  into the same
class of another Lord Abbett-sponsored fund and subsequently redeemed before the
first  anniversary of their original  purchase,  the charge will be collected by
the other fund on behalf of this Fund's Class C shares.

GENERAL.  The  percentage (1% in the case of Class A and C shares and 5% through
1% in the case of Class B shares) used to calculate  CDSCs  described  above for
the Class A, Class B and Class C shares is sometimes  hereinafter referred to as
the "Applicable Percentage". 
<PAGE>

With respect to Class A and Class B shares, no CDSC is payable on redemptions by
participants or beneficiaries from employer-sponsored retirement plans under the
Internal  Revenue  Code  for  benefit  payments  due  to  plan  loans,  hardship
withdrawals,  death,  retirement or  separation  from service and for returns of
excess contributions to retirement plan sponsors. With respect to Class A shares
purchased pursuant to a special  retirement wrap program,  no CDSC is payable on
redemptions  which continue as investments in another fund  participating in the
program.  With respect to Class B shares, no CDSC is payable for redemptions (i)
in connection with Systematic Withdrawal Plan and Div-Move services as described
below under those headings, (ii) in connection with mandatory distribution under
403(b) plans and IRAs and (iii) in connection with death of the shareholder.  In
the case of Class A and Class C shares,  the CDSC is received by the Fund and is
intended  to  reimburse  all or a portion of the amount  paid by the Fund if the
shares are  redeemed  before  the Fund has had an  opportunity  to  realize  the
anticipated  benefits of having a long-term  shareholder account in the Fund. In
the case of Class B shares,  the CDSC is received by Lord Abbett Distributor and
is intended to reimburse its expenses of providing  distribution-related service
to the Fund (including recoupment of the commission payments made) in connection
with the  sale of  Class B shares  before  Lord  Abbett  Distributor  has had an
opportunity to realize its anticipated  reimbursement by having such a long-term
shareholder account subject to the B Plan distribution fee.

The other funds and series which participate in the Telephone Exchange Privilege
(except (a) Lord Abbett U.S.  Government  Securities  Money  Market  Fund,  Inc.
("GSMMF"),  (b)  certain  series of Lord  Abbett  Tax-Free  Income Fund and Lord
Abbett  Tax-Free  Income Trust for which a Rule 12b-1 Plan is not yet in effect,
and (c) any authorized  institution's  affiliated  money market fund  satisfying
Lord  Abbett  Distributor  as to certain  omnibus  account  and other  criteria,
hereinafter  referred  to  as  an  "authorized  money  market  fund"  or  "AMMF"
(collectively,  the "Non-12b-1 Funds")) have instituted a CDSC for each class on
the same terms and conditions.  No CDSC will be charged on an exchange of shares
of the same class between Lord Abbett funds or between such funds and AMMF. Upon
redemption of shares out of the Lord Abbett family of funds or out of AMMF,  the
CDSC  will be  charged  on  behalf  of and  paid:  (i) to the fund in which  the
original purchase  (subject to a CDSC) occurred,  in the case of the Class A and
Class C shares and (ii) to Lord Abbett  Distributor if the original purchase was
subject to a CDSC, in the case of the Class B shares.  Thus, if shares of a Lord
Abbett fund are  exchanged for shares of the same class of another such fund and
the shares of the same class  tendered  ("Exchanged  Shares")  are  subject to a
CDSC,  the CDSC will carry over to the shares of the same class being  acquired,
including GSMMF and AMMF ("Acquired  Shares").  Any CDSC that is carried over to
Acquired  Shares is calculated as if the holder of the Acquired  Shares had held
those shares from the date on which he or she became the holder of the Exchanged
Shares.  Although the Non-12b-1  Funds will not pay a distribution  fee on their
own shares, and will, therefore,  not impose their own CDSC, the Non-12b-1 Funds
will collect the CDSC (a) on behalf of other Lord Abbett  funds,  in the case of
the Class A and Class C shares and (b) on behalf of Lord Abbett Distributor,  in
the case of the Class B shares. Acquired Shares held in GSMMF and AMMF which are
subject to a CDSC will be  credited  with the time such shares are held in GSMMF
but will not be credited with the time such shares are held in AMMF.  Therefore,
if your Acquired Shares held in AMMF qualified for no CDSC or a lower Applicable
Percentage at the time of exchange into AMMF,  that  Applicable  Percentage will
apply to  redemptions  for cash from AMMF,  regardless of the time you have held
Acquired Shares in AMMF.

In no event will the amount of the CDSC exceed the Applicable  Percentage of the
lesser of (i) the net asset value of the shares  redeemed  or (ii) the  original
cost of such  shares (or of the  Exchanged  Shares for which  such  shares  were
acquired). No CDSC will be imposed when the investor redeems (i) amounts derived
from  increases in the value of the account above the total cost of shares being
redeemed due to increases in net asset value,  (ii) shares with respect to which
no Lord Abbett  fund paid a 12b-1 fee and,  in the case of Class B shares,  Lord
Abbett  Distributor  paid no sales  charge  or  service  fee  (including  shares
acquired   through   reinvestment   of  dividend   income  and   capital   gains
distributions) or (iii) shares which,  together with Exchanged Shares, have been
held  continuously for 24 months from the end of the month in which the original
sale  occurred  (in the case of Class A  shares);  for six years or more (in the
case  of  Class B  shares)  and for one  year or more  (in the  case of  Class C
shares). In determining whether a CDSC is payable, (a) shares not subject to the
CDSC will be redeemed  before  shares  subject to the CDSC and (b) of the shares
subject to a CDSC, those held the longest will be the first to be redeemed.

EXCHANGES.  The Prospectus briefly describes the Telephone  Exchange  Privilege.
You may  exchange  some or all of your shares of any class for those in the same

<PAGE>

class of: (i) Lord Abbett-sponsored funds currently offered to the public with a
sales charge  (front-end,  back-end or level ), (ii) GSMMF or (iii) AMMF, to the
extent  offers  and  sales  may be made in  your  state.  You  should  read  the
prospectus of the other fund before exchanging. In establishing a new account by
exchange, shares of the Fund being exchanged must have a value equal to at least
the  minimum  initial  investment  required  for the other  fund into  which the
exchange is made.

Shareholders in other Lord  Abbett-sponsored  funds and AMMF have the same right
to  exchange  their  shares for the  corresponding  class of the Fund's  shares.
Exchanges  are based on relative  net asset values on the day  instructions  are
received by the Fund in Kansas City if the  instructions  are received  prior to
the close of the NYSE in proper form. No sales charges are imposed except in the
case of  exchanges  out of  GSMMF or AMMF  (unless  a sales  charge  (front-end,
back-end or level) was paid on the initial investment in a Lord Abbett-sponsored
fund).  Exercise of the exchange privilege will be treated as a sale for federal
income tax purposes, and, depending on the circumstances,  a gain or loss may be
recognized. In the case of an exchange of shares that have been held for 90 days
or less where no sales charge is payable on the  exchange,  the  original  sales
charge incurred with respect to the exchanged  shares will be taken into account
in  determining  gain or loss on the  exchange  only to the extent  such  charge
exceeds the sales charge that would have been payable on the acquired shares had
they been acquired for cash rather than by exchange. The portion of the original
sales charge not so taken into  account will  increase the basis of the acquired
shares.

Shareholders have the exchange  privilege unless they refuse it in writing.  You
should  not view the  exchange  privilege  as a means for  taking  advantage  of
short-term swings in the market,  and we reserve the right to terminate or limit
the privilege of any shareholder who makes frequent exchanges.  We can revoke or
modify the privilege for all shareholders upon 60 days' prior notice.  "Eligible
Funds" are AMMF and other Lord Abbett-sponsored funds which are eligible for the
exchange  privilege,  except Lord Abbett Series Fund  ("LASF")  which offers its
shares only in connection with certain variable annuity  contracts,  Lord Abbett
Equity  Fund  ("LAEF")  which is not issuing  shares,  and series of Lord Abbett
Research Fund not offered to the general public ("LARF").

STATEMENT  OF  INTENTION.  Under  the terms of the  Statement  of  Intention  as
described  in the  Prospectus  you may invest  $100,000  or more over a 13-month
period in shares of a Lord  Abbett-sponsored  fund  (other  than shares of LAEF,
LASF, LARF,  GSMMF and AMMF,  unless holdings in GSMMF and AMMF are attributable
to shares exchanged from a Lord  Abbett-sponsored fund offered with a front-end,
back-end or level sales charge).  Shares  currently owned by you are credited as
purchases (at their current offering prices on the date the Statement is signed)
toward  achieving  the stated  investment  and reduced  initial sales charge for
Class A shares.  Class A shares valued at 5% of the amount of intended purchases
are escrowed and may be redeemed to cover the additional sales charge payable if
the  Statement  of  Intention is not  completed.  The  Statement of Intention is
neither a binding  obligation  on you to buy, nor on the Fund to sell,  the full
amount indicated.

RIGHTS OF ACCUMULATION.  As stated in the Prospectus,  purchasers (as defined in
the Prospectus) may accumulate their investment in Lord  Abbett-sponsored  funds
(other than LAEF, LARF,  LASF,  GSMMF, and AMMF unless holdings in GSMMF or AMMF
are attributable to shares exchanged from a Lord  Abbett-sponsored  fund offered
with a front-end,  back-end or level sales charge) so that a current investment,
plus the  purchaser's  holdings  valued at the current  maximum  offering price,
reach a level eligible for a discounted sales charge for Class A shares.

NET ASSET VALUE PURCHASES OF CLASS A SHARES.  As stated in the  Prospectus,  our
Class A shares may be purchased at net asset value by our  directors,  employees
of Lord Abbett,  employees of our  shareholder  servicing agent and employees of
any securities  dealer having a sales agreement with Lord Abbett who consents to
such   purchases  or  by  the  director  or  custodian   under  any  pension  or
profit-sharing plan or Payroll Deduction IRA established for the benefit of such
persons  or for the  benefit  of  employees  of any  national  securities  trade
organization  to which Lord Abbett  belongs or any company with an account(s) in
excess of $10  million  managed  by Lord  Abbett  on a  private-advisory-account
basis.  For purposes of this  paragraph,  the terms  "directors" and "employees"
include a director's or employee's  spouse  (including the surviving spouse of a
deceased director or employee). The terms "our directors" and "employees of Lord
Abbett" also include  retired  directors and employees and other family  members
thereof.
<PAGE>


Our Class A shares also may be purchased at net asset value (a) at $1 million or
more,  (b) with  dividends and  distributions  from Class A shares of other Lord
Abbett-sponsored  funds,  except  for LARF,  LAEF and  LASF,  (c) under the loan
feature of the Lord  Abbett-sponsored  prototype 403(b) plan for share purchases
representing the repayment of principal and interest,  (d) by certain authorized
brokers, dealers, registered investment advisers or other financial institutions
who have entered into an agreement  with Lord Abbett  Distributor  in accordance
with  certain  standards   approved  by  Lord  Abbett   Distributor,   providing
specifically  for the use of our shares in particular  investment  products made
available for a fee to clients of such brokers,  dealers,  registered investment
advisers and other financial institutions, ("mutual fund wrap fee program"), (e)
by employees,  partners and owners of  unaffiliated  consultants and advisors to
Lord Abbett, Lord Abbett Distributor or Lord Abbett-sponsored  funds who consent
to such  purchase if such persons  provide  service to Lord Abbett,  Lord Abbett
Distributor  or such  funds on a  continuing  basis and are  familiar  with such
funds,  (f)  through  Retirement  Plans  with at least 100  eligible  employees,
through a special retirement wrap program sponsored by an authorized institution
having one or more  characteristics  distinguishing  it, in the  opinion of Lord
Abbett  Distributor,  from a mutual  fund  wrap  program.  Such  characteristics
include,  among other things,  the fact that an authorized  institution does not
charge  its  clients  any  fee  of a  consulting  or  advisory  nature  that  is
economically equivalent to the distribution fee under Class A 12b-1 Plan and the
fact that the program relates to participant-directed Retirement Plan.

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 the 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 60  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 months'  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.

DIV-MOVE. Under the Div-Move service described in the Prospectus, you can invest
the dividends paid on your account of any class into an existing  account of the
same class in any other  Eligible Fund. The account must be either your account,
a joint account for you and your spouse, a single account for your spouse,  or a
custodial  account for your minor child under the age of 21. You should read the
prospectus of the other fund before investing.

INVEST-A-MATIC.  The  Invest-A-Matic  method of investing in the Fund and/or any
other  Eligible Fund is described in the  Prospectus.  To avail yourself of this
method you must complete the application form,  selecting the time and amount of
your bank checking account  withdrawals and the funds for investment,  include a
voided, unsigned check and complete the bank authorization.

SYSTEMATIC  WITHDRAWAL  PLANS.  The Systematic  Withdrawal  Plan ("SWP") also is
described  in the  Prospectus.  You may  establish  a SWP if you own or purchase
uncertificated shares having a current offering price value of at least $10,000.
Lord Abbett  prototype  retirement  plans have no such minimum.  With respect to
Class B shares the CDSC will be waived on  redemptions  of up to 12% per year of
the current net asset value of your account at the time the SWP is  established.
For  Class B share  redemptions  over 12% per year,  the CDSC will  apply to the
entire  redemption.  Therefore,  please  contact  the  Fund  for  assistance  in
minimizing the CDSC in this situation.  With respect to Class C shares, the CDSC
will be waived on and after the first  anniversary  of their  purchase.  The SWP
involves  the  planned  redemption  of shares on a periodic  basis by  receiving
either  fixed or  variable  amounts at  periodic  intervals.  Since the value of
shares  redeemed  may be more or  less  than  their  cost,  gain or loss  may be
recognized for income tax purposes on each periodic payment.  Normally,  you may

<PAGE>

not make  regular  investments  at the same  time you are  receiving  systematic
withdrawal  payments because it is not in your interest to pay a sales charge on
new  investments  when in  effect  a  portion  of that  new  investment  is soon
withdrawn.  The minimum investment accepted while a withdrawal plan is in effect
is  $1,000.  The SWP may be  terminated  by you or by us at any time by  written
notice.

RETIREMENT  PLANS.  The Prospectus  indicates the types of retirement  plans for
which Lord Abbett provides forms and  explanations.  Lord Abbett makes available
the retirement  plan forms including  401(k) plans and custodial  agreements for
IRAs  (Individual  Retirement  Accounts,  including  SIMPLE IRAs and  Simplified
Employee Pensions), 403(b) plans and qualified pension and profit-sharing plans.
The forms name  Investors  Fiduciary  Trust  Company as  custodian  and  contain
specific information about the plans excluding 401(k) plans. Explanations of the
eligibility requirements, annual custodial fees and allowable tax advantages and
penalties are set forth in the relevant plan documents. Adoption of any of these
plans should be on the advice of your legal counsel or qualified tax adviser.

                                       6.
                                Past Performance

The Series computes the average annual  compounded rate of total return for each
class 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 the  maximum  sales  charge  (as  described  in the  next
paragraph) from the 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  covered by the average  annual
total return computation.

In  calculating  total  returns for Class A shares,  the current  maximum  sales
charge of 4.75% (as a  percentage  of the offering  price) is deducted  from the
initial  investment (unless the return is shown at net asset value). For Class B
shares,  the payment of the applicable CDSC (5.0% prior to the first anniversary
of purchase, 4.0% prior to the second anniversary of purchase, 3.0% prior to the
third and fourth anniversaries of purchase,  2.0% prior to the fifth anniversary
of purchase,  1.0% prior to the sixth anniversary of purchase and no CDSC on and
after the sixth  anniversary of purchase) is applied to the Series's  investment
result for that class for the time  period  shown  (unless  the total  return is
shown at net asset value).  For Class C shares,  the 1.0% CDSC is applied to the
Series'  investment result for that class for the time period shown prior to the
first  anniversary  of purchase  (unless the total  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.

Using the  computation  method  described  above,  the  Series'  average  annual
compounded  rates  of  total  return  for the  period  from  December  18,  1997
(commencement  of  operations)  to March , 1998 was %, % and %, for the  Series'
Class A, B and C shares, respectively.

Yield  quotation for each Class is based on a 30-day period ended on a specified
date, computed by dividing our net investment income per share earned during the
period by the maximum  offering price per share of such Class on the last day of
the period.  This is  determined  by finding the  following  quotient:  take the
Class'  dividends  and  interest  earned  during the period  minus its  expenses
accrued for the period and divide by the product of (i) the average daily number
of shares of such Class  outstanding  during the period  that were  entitled  to
receive dividends and (ii) the maximum offering price 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.  Yield for the Class A
shares reflects the deduction of the maximum initial sales charge,  but may also
be shown based on the Fund's net asset value per share. Yields for Class B and C
shares do not reflect the  deduction  of the CDSC.  For the 30-day  period ended
March , 1998,  the yield for the Class A, B and C shares of the Series were %, %
and %, respectively.
<PAGE>

These figures represent past  performance,  and an investor should be aware that
the investment return and principal value of a Fund 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 the Fund or  repurchased  or otherwise sold
may be  more  or less  than  your  tax  basis  in the  shares  at the  time  the
redemption,  repurchase  or sale is made.  Any gain or loss  will  generally  be
taxable  for  federal  income  tax  purposes.  Any loss  realized  on the  sale,
redemption  or  repurchase  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 stock or securities 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  stock or  securities  that are
substantially identical.

The Series will be subject to a 4% non-deductible  excise tax on certain amounts
not distributed  (and not treated as having been  distributed) on a timely basis
in accordance with a calendar-year distribution requirement.  The Series intends
to  distribute  to  shareholders  each  year an  amount  adequate  to avoid  the
imposition of such excise tax. Dividends paid by the Series will qualify for the
dividends-received  deduction  for  corporations  to the extent they are derived
from dividends paid by domestic corporations.

As described in the Prospectus,  the Series may be subject to withholding  taxes
and other  taxes  imposed by foreign  countries.  If, at the close of any fiscal
year,  more than 50% of the assets of the Series of the Fund consist of stock or
securities of foreign corporations, the Series may elect to treat foreign income
taxes paid by the Series as having been paid directly by its shareholders.  If a
Series qualifies for and makes such an election,  the shareholders of the Series
will be required to (i) include in ordinary gross income (in addition to taxable
dividends  actually  received) their pro rata share of foreign income taxes paid
by the Series and (ii) treat such pro rata share as foreign income taxes paid by
them.  Such  shareholders  may then use such pro rata portion of foreign  income
taxes  as  foreign  tax  credits,   subject  to  applicable   limitations,   or,
alternatively,  deduct them in computing their taxable income.  Shareholders who
do not itemize  deductions  for federal income tax purposes will not be entitled
to deduct their pro rata portion of foreign  taxes paid by the Series,  although
such shareholders will be required to include their share of such taxes in gross
income.  Shareholders  who claim a foreign tax credit for foreign  taxes paid by
the Series may be required  to treat a portion of  dividends  received  from the
Series as separate  category income for purposes of computing the limitations on
the foreign tax credit. Tax-exempt shareholders will ordinarily not benefit from
this  election.  Each year that the Series  qualifies for and makes the election
described  above,  its  shareholders  will be notified of the amount of (i) each
shareholder's pro rata share of foreign income taxes paid by the Series and (ii)
the portion of dividends which represents income from each foreign country.

Forward foreign  currency  contracts,  foreign currency put and call options and
other  investment  techniques  and  practices  which the Series may utilize,  as
described  above  under   "Investment   Objectives  and  Policies,"  may  create
"straddles"  for United  States  federal  income tax purposes and may affect the
character and timing of the  recognition  of gains and losses by a Series.  Such
hedging transactions may increase the amount of short-term capital gain realized
by  such  Series,  which  is  taxed  as  ordinary  income  when  distributed  to
shareholders.  Limitations  imposed by the  Internal  Revenue  Code on regulated
investment  companies may restrict the Series' ability to engage in transactions
in options and forward contracts.

Gains and losses realized by the Series 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 gains or losses are  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
gains and will be reduced by the net amount,  if any, of such  foreign  exchange
losses.
<PAGE>

If the Series purchases shares in certain foreign  investment  entities,  called
"passive  foreign  investment  companies,"  the  Series 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 Series to its shareholders.  Additional charges in the nature of
interest may be imposed on either the Series or its shareholders with respect to
deferred taxes arising from such  distributions  or gains. If the Series were to
invest in a passive foreign  investment company with respect to which the Series
elected to make a "qualified  electing fund" election,  in lieu of the foregoing
requirements,  the Series  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 the Series.

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
the series, 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 to non-United  States
persons who own Fund shares.

                                       8.
                           Information About the Fund

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,  from  profiting on trades of the
same  security  within  60 days and from  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 the Advisory Group.

                                       9.
                              Financial Statements

The  financial  statements  for the fiscal  year ended  October 31, 1997 and the
report of  Deloitte & Touche LLP,  independent  accountants,  on such  financial
statements  contained in the 1997 Annual Report to  Shareholders  of 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.

<PAGE>

                                       10.
                                    Appendix

                             Corporate Bond Ratings

Moody's Investors Service, Inc.'s Corporate Bond Ratings

Aaa - Bonds  which are rated Aaa are judged to be of the best  quality and carry
the smallest  degree of investment  risk.  Interest  payments are protected by a
large or by an exceptionally  stable margin, and principal is secure.  While the
various  protective  elements  are  likely to  change,  such  changes  as can be
visualized are most unlikely to impair the fundamentally strong position of such
issues.

Aa - Bonds which are rated Aa are judged to be of high-quality by all standards.
Together  with  the Aaa  group,  they  comprise  what  are  generally  known  as
high-grade  bonds.  They are rated lower than the best bonds because  margins of
protection may not be as large as in Aaa  securities,  fluctuation of protective
elements  may be of greater  amplitude  or there may be other  elements  present
which make the long-term risks appear somewhat larger than in Aaa securities.

A - Bonds which are rated A possess many favorable investment attributes and are
to be considered as upper medium-grade  obligations.  Factors giving security to
principal and interest are considered adequate but elements may be present which
suggest a susceptibility to impairment sometime in the future.

Baa - Bonds  which are rated Baa are  considered  as  medium-grade  obligations,
i.e., they are neither highly  protected nor poorly secured.  Interest  payments
and principal  security appear  adequate for the present but certain  protective
elements may be lacking or may be  characteristically  unreliable over any great
length of time. Such bonds lack outstanding  investment  characteristics and, in
fact, have speculative characteristics as well.

Ba - Bonds  which are rated Ba are judged to have  speculative  elements;  their
future cannot be considered  as well assured.  Often the  protection of interest
and  principal  payments may be very  moderate and thereby not well  safeguarded
during  both  good  and bad  times  over the  future.  Uncertainty  of  position
characterizes bonds in this class.

B - Bonds  which are  rated B  generally  lack  characteristics  of a  desirable
investment.  Assurance of interest and principal  payments or of maintenance and
other terms of the contract over any long period of time may be small.

Caa - Bonds  that are  rated Caa are of poor  standing.  Such  issues  may be in
default or there may be present  elements of danger with respect to principal or
interest.

Ca - Bonds that are rated Ca represent  obligations  which are  speculative in a
high degree. Such issues are often in default or have other marked shortcomings.

C - Bonds  that are rated C are the  lowest-rated  class of bonds and  issues so
rated can be regarded as having  extremely  poor prospects of ever attaining any
real investment standing.


Standard & Poor's Corporation's Corporate Bond Ratings

AAA - This is the  highest  rating  assigned  by  Standard  &  Poor's  to a debt
obligation  and  indicates an extremely  strong  capacity to pay  principal  and
interest.

AA - Bonds rated AA also qualify as high-quality debt  obligations.  Capacity to
pay principal and interest is very strong and in the majority of instances  they
differ from AAA issues only in small degree.

A - Bonds rated A have a strong capacity to pay principal and interest, although
they are  somewhat  more  susceptible  to the  adverse  effects  of  changes  in
circumstances and economic conditions.

BBB - Bonds  rated  BBB are  regarded  as  having an  adequate  capacity  to pay
principal  and  interest.  Whereas they  normally  exhibit  adequate  protection
parameters,  adverse  economic  conditions  or changing  circumstances  are more
likely to lead to a weakened capacity to pay principal and interest for bonds in
this category than for bonds in the A category.

BB-B-CCC-CC-C  -  Debt  rated  BB,  B,  CCC,  CC  and C is  regarded  as  having
predominately  speculative  characteristics  with  respect  to  capacity  to pay
interest and repay principal. 'BB' indicates the least degree of speculation and
'CCC' the highest.  While such debt will likely have some quality and protective
characteristics,  these are  outweighed  by large  uncertainties  or major  risk
exposures to adverse conditions.

D - Debt rated 'D' is in payment  default.  The 'D' rating category is used when
interest payments or principal payments are not made on the date due even if the
applicable grace period has not expired,  unless S&P believes such payments will
be made  during  such grace  period.  The 'D' rating  also will be used upon the
filing of a bankruptcy petition if debt service payments are jeopardized.



<PAGE>


PART C            OTHER INFORMATION

Item 24.          FINANCIAL STATEMENTS AND EXHIBITS

                  (a)    Financial Statements
                         Part A - Financial  Highlights for the period  December
                         31, 1994  (commencement  of operations  Growth & Income
                         Series) to October 31, 1995; fiscal years ended October
                         31, 1996 and 1997.

                         Part B -  Statement  of Net  Assets  (Growth  &  Income
                         Series) at October 31, 1996.  Statement  of  Operations
                         (Growth & Income  Series)  for the fiscal  years  ended
                         October 31, 1996 and 1997.

                  (b)    Exhibits -

                         99.B1          Amendment to Declaration of Trust*
                         99.B5          Addendum to Management Agreement*
                         99.B11         Consent of Deloitte & Touche**
                         99.B18         Amended and Restated Plan entered into 
                                        by Registrant pursuant to Rule 18f-3***
                         Ex. 27         Financial Data Schedule*

                          *             Filed herewith.
                         **             To be filed.
                        ***             Incorporated by Reference to 
                                        Post-Effective Amendment No. 12 to the
                                        Registration Statement on Form N-1A of 
                                        Lord Abbett Investment Trust, filed on 
                                        11/7/97 (File No. 33-68090).

                    Exhibit  items not listed  above have  either  already  been
                    filed or are not applicable.

Item 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

                  None.


Item 26. NUMBER OF RECORD HOLDERS OF SECURITIES
                  (as of December 5, 1997)

                  Growth   & Income Series 
                              Class A - 3,285 
                              Class B -   118 
                              Class C - 4,444

                  International Series

                         Class A - 3,345 
                         Class B -   566 
                         Class C -   744


Item 27.          INDEMNIFICATION

                  The Registrant is a Delaware  Business Trust established under
                  Chapter 38 of Title 12 of the Delaware Code. The  Registrant's
                  Declaration and Instrument of Trust at Section 4.3 relating to
                  indemnification  of  Trustees,   officers,   etc.  states  the
                  following.
<PAGE>

                  The Trust  shall  indemnify  each of its  Trustees,  officers,
                  employees and agents  (including  any individual who serves at
                  its request as director, officer, partner, trustee or the like
                  of  another  organization  in which it has any  interest  as a
                  shareholder,  creditor or otherwise)  against all  liabilities
                  and  expenses,  including  but not limited to amounts  paid in
                  satisfaction  of  judgments,  in  compromise  or as fines  and
                  penalties,  and counsel fees reasonably incurred by him or her
                  in connection  with the defense or  disposition of any action,
                  suit or other  proceeding,  whether civil or criminal,  before
                  any court or administrative or legislative body in which he or
                  she may be or may have been  involved as a party or  otherwise
                  or with  which he or she may be or may have  been  threatened,
                  while acting as Trustee or as an officer, employee or agent of
                  the Trust or the Trustees,  as the case may be, or thereafter,
                  by reason of his or her being or having  been such a  Trustee,
                  officer,  employee or agent, EXCEPT with respect to any matter
                  as to which he or she shall have been  adjudicated not to have
                  acted in good faith in the  reasonable  belief that his or her
                  action  was in the best  interests  of the Trust or any Series
                  thereof.  Notwithstanding  anything herein to the contrary, if
                  any matter which is the subject of  indemnification  hereunder
                  relates only to one Series (or to more than one but not all of
                  the Series of the  Trust),  then the  indemnity  shall be paid
                  only out of the assets of the affected  Series.  No individual
                  shall be  indemnified  hereunder  against any liability to the
                  Trust or any Series thereof or the  Shareholders  by reason of
                  willful  misfeasance,  bad faith, gross negligence or reckless
                  disregard of the duties  involved in the conduct of his or her
                  office. In addition,  no such indemnity shall be provided with
                  respect  to  any  matter   disposed  of  by  settlement  or  a
                  compromise  payment  by such  Trustee,  officer,  employee  or
                  agent,  pursuant to a consent decree or otherwise,  either for
                  said payment or for any other expenses unless there has been a
                  determination that such compromise is in the best interests of
                  the Trust or, if  appropriate,  of any affected Series thereof
                  and that such  Person  appears  to have acted in good faith in
                  the  reasonable  belief that his or her action was in the best
                  interests  of the Trust or, if  appropriate,  of any  affected
                  Series thereof, and did not engage in willful misfeasance, bad
                  faith,  gross  negligence or reckless  disregard of the duties
                  involved   in  the   conduct  of  his  or  her   office.   All
                  determinations  that the applicable  standards of conduct have
                  been met for indemnification  hereunder shall be made by (A) a
                  majority vote of a quorum consisting of disinterested Trustees
                  who  are  not   parties   to  the   proceeding   relating   to
                  indemnification, or (B) if such a quorum is not obtainable or,
                  even if  obtainable,  if a  majority  vote of such  quorum  so
                  directs, by independent legal counsel in a written opinion, or
                  (C) a vote of Shareholders  (excluding  Shares owned of record
                  or beneficially  by such  individual).  In addition,  unless a
                  matter is  disposed of with a court  determination  (I) on the
                  merits that such Trustee,  officer,  employee or agent was not
                  liable or (ii)  that such  Person  was not  guilty of  willful
                  misfeasance, bad faith, gross negligence or reckless disregard
                  of the duties involved in the conduct of his or her office, no
                  indemnification  shall be provided  hereunder unless there has
                  been a determination by independent legal counsel in a written
                  opinion   that  such   Person   did  not   engage  in  willful
                  misfeasance, bad faith, gross negligence or reckless disregard
                  of the duties involved in the conduct of his or her office.

                  The Trustees  may make  advance  payments out of the assets of
                  the  Trust  or,  if  appropriate,  of the  affected  Series in
                  connection  with the  expense of  defending  any  action  with
                  respect to which  indemnification  might be sought  under this
                  Section 4.3. The  indemnified  Trustee,  officer,  employee or
                  agent shall give a written  undertaking to reimburse the Trust
                  or the Series in the event it is subsequently  determined that
                  he or she is not entitled to such  indemnification and (A) the
                  indemnified Trustee,  officer, employee or agent shall provide
                  security  for his or her  undertaking,  (b) the Trust shall be
                  insured  against losses arising by reason of lawful  advances,
                  or (C) a majority of a quorum of disinterested  Trustees or an
                  independent   legal   counsel  in  a  written   opinion  shall
                  determine,  based on a review of readily  available  facts (as
                  opposed to a full trial-type inquiry), that there is reason to
                  believe that the indemnitee  ultimately will be found entitled
                  to  indemnification.  The  rights  accruing  to  any  Trustee,
                  officer,  employee or agent under these  provisions  shall not
                  exclude  any  other  right to which he or she may be  lawfully
                  entitled  and shall  inure to the benefit of his or her heirs,
                  executors, administrators or other legal representatives.


<PAGE>

                  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 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.

Item 28.          BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

                  Lord, Abbett & Co. acts as investment manager and/or principal
                  underwriter for twelve other Lord Abbett  open-end  investment
                  companies (of which it is principal underwriter for thirteen),
                  and as  investment  adviser  to  approximately  5,878  private
                  accounts  as of  September  30,  1997.  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
                  except as follows:


                           John J. Walsh
                           Trustee
                           Brooklyn Hospital
                           Parkside Avenue
                           Brooklyn, N.Y.

Item 29.          PRINCIPAL UNDERWRITER

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

                  INVESTMENT ADVISER

                American Skandia Trust (Lord Abbett Growth and Income Portfolio)
<PAGE>

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

                     Name and Principal               Positions and Offices
                     BUSINESS ADDRESS (1)             WITH REGISTRANT

                     Robert S. Dow                    Chairman and President
                     Paul A. Hilstad                  Vice President & Secretary
                     Stephen I. Allen                 Vice President
                     Zane E. Brown                    Vice President
                     Daniel E. Carper                 Vice President
                     Daria L. Foster                  Vice President
                     Robert G. Morris                 Vice President
                     Robert J.Noelke                  Vice President
                     E. Wayne Nordberg                Vice President
                     John J. Walsh                    Vice President

                    The other  general  partners  of Lord  Abbett & Co.  who are
                    neither  officers  nor  directors of the  Registrant  are W.
                    Thomas Hudson and Michael McLaughlin.

               (1)  Each of the above has a  principal  business  address at 767
                    Fifth Avenue, New York, NY 10153

     (c)  Not applicable

Item 30.          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  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 31.          MANAGEMENT SERVICES

                  None.

Item 32.          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 to file a post-effective  amendment,
                  using financial statements which need not be certified, within
                  four to six months  from the  effective  date of  Registrant's
                  1933 Act Registration Statement.

                  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).






<PAGE>


                                   SIGNATURES


Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company Act of 1940 the Registrant has duly caused this  Registration  Statement
and/or any  amendment  thereto  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
31st day of December 1997.

                                                  LORD ABBETT SECURITIES TRUST



                                                  BY s/Robert S. Dow
                                                     ---------------------------
                                                     Robert S. Dow
                                                     Chairman of the Board

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 dates indicated.

                               Chairman, President
s/Robert S. Dow                and Trustee                     December 31, 1997
- - - ---------------------------   --------------------------    --------------------
Robert S. Dow                         (Title)                             (Date)


                               Vice President and
s/Keith F. O'Connor            Chief Financial Officer        December 31, 1997
- - - ---------------------------   --------------------------    --------------------
Keith F. O'Connor                     (Title)                             (Date)


s/E. Wayne Nordberg            Trustee                         December 31, 1997
- - - ---------------------------   --------------------------    --------------------
E. Wayne Nordberg                     (Title)                             (Date)


s/Stewart S. Dixon             Trustee                         December 31, 1997
- - - ---------------------------   --------------------------    --------------------
Stewart S. Dixon                      (Title)                             (Date)


s/John C. Jansing              Trustee                         December 31, 1997
- - - ---------------------------   --------------------------    --------------------
John C. Jansing                       (Title)                             (Date)


s/C. Alan MacDonald            Trustee                        December 31, 1997
- - - ---------------------------   --------------------------    --------------------
C. Alan MacDonald                     (Title)                             (Date)


s/Hansel B. Millican           Trustee                       December 31, 1997
- - - ---------------------------   --------------------------    --------------------
Hansel B. Millican, Jr.               (Title)                             (Date)


s/Thomas J. Neff               Trustee                         December 31, 1997
- - - ---------------------------   --------------------------    --------------------
Thomas J. Neff                        (Title)                             (Date)


s/Thayer Bigelow               Trustee                        December 31, 1997
- - - ---------------------------   --------------------------    --------------------
E. Thayer Bigelow                     (Title)                             (Date)




                                               EXHIBIT 99.B1

                          LORD ABBETT SECURITIES TRUST

                                  AMENDMENT TO
                              DECLARATION OF TRUST

           The  undersigned,  being at least a majority of the  Trustees of Lord
Abbett  Securities  Trust, a Delaware  business  trust (the "Trust"),  organized
pursuant to a Declaration of Trust dated February 26, 1993 (the  "Declaration"),
do hereby establish,  pursuant to Section 5.3 of the Declaration, two new series
of the Trust to be designated as (i) World Bond Debenture Series; and (ii) Alpha
Series.  The initial classes of shares for the World Bond Debenture Series shall
be  designated  the Class A,  Class B, Class C and Class Y shares.  The  initial
classes of shares for the Alpha Series shall be designated  the Class A, Class B
and Class C shares.  Any variations  between such classes as to purchase  price,
determination  of net asset value,  the price,  terms and manner of  redemption,
special and relative rights as to dividends and on  liquidation,  and conditions
under which such classes  shall have  separate  voting  rights,  shall be as set
forth in the Declaration or as elsewhere  determined by the Board of Trustees of
the Trust.

           This instrument shall constitute an amendment to the Declaration.

           IN WITNESS  WHEREOF,  the  undersigned  have executed this instrument
this 12th day of November, 1997.


/S/ Robert S. Dow                                   /S/ John C. Jansing
- - - ---------------------------------                    -------------------------
    Robert S. Dow                                       John C. Jansing
                                                        
/S/ C. Alan MacDonald                              /S/ Hansel B. Millican, Jr.
- - - ---------------------------------                  ---------------------------
    C. Alan MacDonald                                  Hansel B. Millican, Jr.
                                                       
/S/ E. Thayer Bigelow                              /S/ Thomas J. Neff
- - - --------------------------------                   ---------------------------
    E. Thayer Bigelow                                  Thomas J. Neff
                                                       
/S/ Stewart S. Dixon                               /S/ E. Wayne Nordberg
- - - --------------------------------                   ---------------------------
    Stewart S. Dixon                                   E. Wayne Nordberg







                           World Bond-Debenture Series

                             Addendum to Management
                          Agreement between Lord Abbett
                     Securities Trust and Lord, Abbett & Co.
                      DATED MAY 19, 1993 (THE "AGREEMENT")


         Lord,  Abbett & Co. and Lord Abbett  Securities  Trust (the "Trust") on
behalf of WORLD  BOND-DEBENTURE  SERIES  ("Series") do hereby agree that (a) the
annual  management  fee rate for the Series with  respect to  paragraph 2 of the
Agreement  shall be .50% of 1% of the average daily net assets of the Series and
(b) the expense  ratio for the  determination  of the repayment by the Series of
expenses  voluntarily  paid or reimbursed by the Investment  Manager pursuant to
paragraph 5 of the Agreement shall be 1.30%.

         For  purposes  of  Section  15 (a) of the Act,  this  Addendum  and the
Agreement  together shall  constitute the  investment  advisory  contract of the
Series.





                                        LORD, ABBETT & CO.


                                        BY: ________________________
                                            Managing Partner


                          LORD ABBETT SECURITIES TRUST
                   (on behalf of World Bond-Debenture Series)


                                        BY:  _______________________
                                             Vice President


Dated:            , 1997




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<AVG-DEBT-OUTSTANDING>                               0
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<EXPENSES-NET>                                    1280
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000898031
<NAME> LORD ABBETT SECURITIES TRUST
<SERIES>
   <NUMBER> 023
   <NAME> INTERNATIONAL SERIES - CLASS C
       
<S>                             <C>
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</TABLE>


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