SALOMON SMITH BARNEY HOLDINGS INC
424B2, 1998-09-15
SECURITY BROKERS, DEALERS & FLOTATION COMPANIES
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<PAGE>   1
 
THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT IS NOT COMPLETE AND MAY BE
CHANGED. A REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED
WITH THE SECURITIES AND EXCHANGE COMMISSION AND DECLARED EFFECTIVE. THIS
PROSPECTUS SUPPLEMENT IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT
SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE
IS NOT PERMITTED.
 
                SUBJECT TO COMPLETION, DATED SEPTEMBER 10, 1998
 
                                                     [SALOMON SMITH BARNEY LOGO]
                                           A Member of TravelersGroup [UMBRELLA]
 
PROSPECTUS  SUPPLEMENT
(To Prospectus Dated December 1, 1997)
                                                 SAFETY FIRST(SM) INVESTMENTS
                                     Safety of Principal, Opportunity for Growth
                                                UNITS
                       SALOMON SMITH BARNEY HOLDINGS INC.
                       WORLD INDEX ALLOCATION SERIES 1998
 
                    PRINCIPAL-PROTECTED EQUITY LINKED NOTES
                                 BASED UPON THE
                             RUSSELL 2000(R) INDEX
                               DUE         , 2005
                        ($10 PRINCIPAL AMOUNT PER UNIT)
                            ------------------------
 
GENERAL:
 
- - Senior unsecured debt securities of Salomon Smith Barney Holdings Inc.
 
- - Issuable and transferable only in minimum denominations of $10 or integral
  multiples thereof.
 
- - No payments prior to maturity.
 
- - Not redeemable prior to maturity.
 
- - Application will be made to list the Notes on the Chicago Board Options
  Exchange under the symbol "RSB".
PAYMENT AT MATURITY:
 
- - Principal Amount ($10 per Unit) + Supplemental Redemption Amount, if any.
 
- - The Supplemental Redemption Amount will be based on the percentage increase,
  if any, in the Russell 2000(R) Index (calculated based on an average value of
  the Index during a period that is expected to be between 24 and 48 months
  prior to maturity), reduced on a daily basis by an annual adjustment factor
  that is expected to be between 1.25% and 1.75% per annum. The Calculation
  Period and the Adjustment Factor will be determined on the Pricing Date and
  disclosed to you in the final Prospectus Supplement. The annual application of
  the Adjustment Factor will result in a total reduction in the adjusted value
  of the Russell 2000(R) Index used to determine the Supplemental Redemption
  Amount at maturity of between 8.42% and 11.63%.
 
- - The Supplemental Redemption Amount may be ZERO, but will not be less than
  zero.
 
  For information as to the Supplemental Redemption Amount and certain United
States federal income tax consequences to holders of the Notes, you should refer
to "Description of Notes -- Determination of the Supplemental Redemption Amount"
and "Certain United States Federal Income Tax Considerations" in this Prospectus
Supplement.
 
  The Russell 2000(R) Index is a trademark of Frank Russell Company ("Russell")
and has been licensed for use by the Company. The Notes are not sponsored,
endorsed, sold or promoted by Russell. Russell does not make any representation
regarding the advisability of investing in the Notes.
                 INVESTING IN THE NOTES INVOLVES CERTAIN RISKS.
        SEE "RISK FACTORS RELATING TO THE NOTES" BEGINNING ON PAGE S-7.
                            ------------------------
 
THESE NOTES HAVE NOT BEEN APPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR
ANY STATE SECURITIES COMMISSION, NOR HAVE ANY OF THESE ORGANIZATIONS DETERMINED
THAT THIS PROSPECTUS SUPPLEMENT, OR ANY PROSPECTUS, IS ACCURATE OR COMPLETE. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                    PRICE TO                  UNDERWRITING                PROCEEDS TO
                                                     PUBLIC                     DISCOUNT                 THE COMPANY(1)
- ---------------------------------------------------------------------------------------------------------------------------------
<C>  <S>                                    <C>                         <C>                         <C>                       <C>
     Per Unit...........................             $10.00                        $                           $
- ---------------------------------------------------------------------------------------------------------------------------------
     Total..............................               $                           $                           $
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Before deducting expenses payable by the Company estimated at $    .
                            ------------------------
 
  The Notes are offered by the Underwriter named herein, subject to prior sale,
when, as and if accepted by it and subject to certain conditions. It is expected
that delivery of the Notes will be made at the offices of Salomon Smith Barney
Inc., 388 Greenwich Street, New York, New York, or through the facilities of The
Depository Trust Company, on or about     , 1998.
 
                              SALOMON SMITH BARNEY
          , 1998
<PAGE>   2
 
                           SUMMARY INFORMATION -- Q&A
 
     This summary includes questions and answers that highlight selected
information from the accompanying Prospectus and this Prospectus Supplement to
help you understand the Principal-Protected Equity Linked Notes (the "Notes")*
based upon the Russell 2000(R) Index, as published by Frank Russell Company
("Russell"). You should carefully read the entire Prospectus and Prospectus
Supplement to fully understand the terms of the Notes, certain information
regarding how the Russell 2000(R) Index (the "Russell 2000 Index" or the
"Index") is calculated and maintained, as well as the principal tax and other
considerations that are important to you in making a decision about whether to
invest in the Notes. You should, in particular, carefully review the section
entitled "Risk Factors Relating To The Notes", which highlights certain risks,
to determine whether an investment in the Notes is appropriate for you. All of
the information set forth below is qualified in its entirety by the more
detailed explanation set forth elsewhere in this Prospectus Supplement and the
accompanying Prospectus.
 
WHAT ARE THE NOTES?
 
     The Notes are a series of unsecured senior debt securities issued by
Salomon Smith Barney Holdings Inc. (the "Company"). The Notes will rank equally
with all other unsecured and unsubordinated debt of the Company. The Notes
mature on      , 2005 and do not provide for earlier redemption by you or the
Company. The Company will make no periodic payments of interest on the Notes.
The Company will make no other payments on the Notes until maturity.
 
     Each "Unit" of Notes represents a principal amount of $10. You may transfer
the Notes only in denominations of $10 and integral multiples thereof. You will
not have the right to receive physical certificates evidencing your ownership
except under limited circumstances. Instead, the Company will issue the Notes in
the form of a global certificate, which will be held by The Depository Trust
Company (the "Depositary") or its nominee. Direct and indirect participants in
the Depositary will record beneficial ownership of the Notes by individual
investors. You should refer to the section "Description of the
Notes -- Book-Entry System" in this Prospectus Supplement.
 
WHAT WILL I RECEIVE AT MATURITY OF THE NOTES?
 
     We have designed the Notes for investors who want to protect their
investment by receiving at least the principal amount of their investment at
maturity and who also want to participate in a possible increase in the Russell
2000 Index during a specified period. At maturity, you will receive a payment on
each Note equal to the sum of two amounts: the principal amount ($10 per Unit)
and the "Supplemental Redemption Amount", which is based on the percentage
increase, if any, in the Russell 2000 Index, calculated based on an average of
the values of the Index during a period that is expected to be between 24 and 48
months prior to maturity and reduced by an Adjustment Factor, as described
below. You will not receive less than the principal amount.
 
  Principal Amount
 
     The principal amount per Unit is $10.
 
  Supplemental Redemption Amount
 
     The Supplemental Redemption Amount per Unit will equal:
 
<TABLE>
<S>    <C>
 
         Adjusted Ending Value - Starting Value
$10 X    --------------------------------------
                   Starting Value
</TABLE>
 
but will not be less than zero.
 
- ---------------
 
* Please refer to the "Index of Terms" attached as Appendix A for a listing of
  defined terms (which are capitalized) and the pages on which they are defined
  in this Prospectus Supplement.
                                       S-2
<PAGE>   3
 
     "Adjusted Ending Value" means the average of the values of the Russell 2000
Index at the close of the market on the      of each month in the      -month
Calculation Period prior to maturity of the Notes, commencing in      , as
reduced by the Adjustment Factor. If the      of any such month is not an Index
Business Day, the Index value for that month will equal the closing value of the
Index on the next Index Business Day, except that if      , is not an Index
Business Day, the Index value for      , 2005 will equal the closing value of
the Index on the immediately preceding Index Business Day. If there is a
disruption in the trading of the component stocks comprising the Russell 2000
Index or certain futures or options relating to the Russell 2000 Index during a
scheduled calculation date in any such month, the Index value for that month for
purposes of calculating the Adjusted Ending Value will equal the closing value
of the Index on the next Index Business Day on which there is not a market
disruption, except that, in the case of such a disruption on      , 2005 the
Index value for      , 2005 will equal the closing value of the Index on the
immediately preceding Index Business Day on which there is not a market
disruption. You should refer to the section "Description of the Notes -- Market
Disruption Events" in this Prospectus Supplement.
 
     "Adjustment Factor" equals      % per annum, and will be applied to reduce
the value of the Index during the term of the Notes. We will determine the
Adjustment Factor on the date the Notes are priced for initial sale to the
public (the "Pricing Date") and disclose it to you in the final Prospectus
Supplement delivered to you in connection with sales of the Notes. The
Adjustment Factor is expected to be between 1.25% and 1.75% per annum. As a
result of its application, the adjusted value of the Index used to calculate the
Supplemental Redemption Amount at the stated maturity of the Notes is expected
to be 8.42% to 11.63% less than the actual average Index value as calculated on
each of the calculation days during the Calculation Period. For a detailed
discussion of how the Adjustment Factor will affect the value of the Index used
to calculate your Supplemental Redemption Amount (i.e., the Adjusted Ending
Value), see "Description of the Notes -- Determination of the Supplemental
Redemption Amount" and "Risk Factors Relating to the Notes -- Comparison to
Other Securities -- Effect of Adjustment Factor" in this Prospectus Supplement.
 
     "Calculation Period" means the period from and including the date that is
expected to be 24 to 48 months prior to the maturity date to but excluding the
maturity date. We will determine the Calculation Period on the Pricing Date and
disclose it to you in the final Prospectus Supplement delivered to you in
connection with sales of the Notes.
 
     "Starting Value" will equal the value of the Index at the market close on
the Pricing Date. We will disclose the Starting Value to you in the final
Prospectus Supplement delivered to you in connection with sales of the Notes.
 
     For more specific information about the Supplemental Redemption Amount,
please see "Description of the Notes -- Determination of the Supplemental
Redemption Amount" in this Prospectus Supplement.
 
     The Company will pay you a Supplemental Redemption Amount only if the
Adjusted Ending Value is greater than the Starting Value. IF THE ADJUSTED ENDING
VALUE IS LESS THAN, OR EQUAL TO, THE STARTING VALUE, THE SUPPLEMENTAL REDEMPTION
AMOUNT WILL BE ZERO. The Company will pay you the principal amount of the Notes
regardless of whether any Supplemental Redemption Amount is payable.
 
  Supplemental Redemption Amount -- Examples
 
     Here are two examples of hypothetical Supplemental Redemption Amount
calculations:
 
     Example 1:  The average of the values of the Russell 2000 Index over the
          months prior to maturity, as adjusted, is less than the Starting
Value:
 
       Hypothetical Starting Value: 344.97
       Hypothetical Adjusted Ending Value (calculated using the Adjustment
       Factor): 258.73
 
<TABLE>
  <C>                                           <C>    <C>              <S>   <C>
                                                       258.73 - 344.97
   Supplemental Redemption Amount (per Unit) =  $10 X  ---------------  = $0
                                                           344.97
                                                    (Supplemental Redemption Amount
                                                       cannot be less than zero)
</TABLE>
 
     Total payment at maturity (per Unit) = $10 + $0 = $10
 
                                       S-3
<PAGE>   4
 
     Example 2:  The average of the values of the Russell 2000 Index over the
          months prior to maturity, as adjusted, is greater than the Starting
Value:
 
       Hypothetical Starting Value: 344.97
       Hypothetical Adjusted Ending Value (calculated using the Adjustment
       Factor): 517.46
 
<TABLE>
  <C>                                                <C>               <S>
                                                     517.46 - 344.97
  Supplemental Redemption Amount (per Unit) = $10 X  ---------------   =$5
                                                          344.97
</TABLE>
 
     Total payment at maturity (per Unit) = $10 + $5 = $15
 
WHAT IS THE EFFECT OF CALCULATING THE ADJUSTED ENDING VALUE ON THE BASIS OF AN
AVERAGE?
 
     As a result of the use of an average over the Calculation Period, rather
than one closing Index value at maturity, to calculate the Adjusted Ending
Value, the market value of the Notes and the Supplemental Redemption Amount will
be less sensitive to fluctuations in the value of the Index as the time
remaining maturity lessens. This could result in a lower or higher payment than
would be the result if one closing Index value at maturity were used to
calculate the Adjusted Ending Value. In particular, if the Index generally
increases over the Calculation Period then the payment on the Notes will be
lower, and could be materially lower, than would be the case if one closing
Index value at maturity were used.
 
WHO PUBLISHES THE INDEX AND WHAT DOES IT MEASURE?
 
     The Russell 2000 Index is published by Russell and is designed to track the
performance of 2,000 common stocks of corporations with small market
capitalizations relative to those of other stocks that are publicly traded in
the U.S. equity markets. Market capitalization is a measure of the value of a
corporation's stock in the public market, and is determined by multiplying the
number of shares of stock outstanding by the current price of a share. As of
August 31, 1998, the market capitalization of the issuers whose stocks comprise
the Russell 2000 Index ranged from approximately $222 million to $1.4 billion,
with the average market capitalization being $592 million. The issuers of stocks
that comprise the Russell 2000 Index are domiciled in the U.S. and its
territories and their stocks are traded on the New York Stock Exchange (the
"NYSE"), on the American Stock Exchange (the "AMEX"), or in the over-the-counter
market.
 
     Please note that an investment in the Notes does not entitle you to any
ownership or other interest in the stocks of the companies included in the
Index.
 
HOW HAS THE RUSSELL 2000 INDEX PERFORMED HISTORICALLY?
 
     We have provided a table showing the closing value of the Russell 2000
Index on the last business day of each year from 1978 to 1997 and the closing
values of the Index on the last business day of each month from January 1992
through August 1998. You can find these tables in the section "The Russell 2000
Index -- Historical Data on the Russell 2000 Index" in this Prospectus
Supplement. You can observe from this table that while the Russell 2000 Index
has increased over the periods shown, it has declined significantly in recent
weeks (approximately 25% from July 1, 1998 through September 10, 1998). We have
provided this historical information to help you evaluate the behavior of the
Russell 2000 Index in various economic environments; however, past performance
is not necessarily indicative of how the Index will perform in the future. You
should refer to the section "Risk Factors Relating to the Notes -- Relationship
of the Notes and the Russell 2000 Index".
 
WHAT ABOUT TAXES?
 
     If you are a U.S. individual or taxable entity, you generally will be
required to pay taxes on ordinary income from the Notes over their term based
upon an estimated yield for the Notes, even though you will not receive any
payments from us until maturity. We have determined this estimated yield, in
accordance with regulations issued by the Treasury Department, solely in order
for you to figure out the amount of taxes that you will owe each year as a
result of owning a Note. This estimate is neither a prediction nor a guarantee
of what the actual Supplemental Redemption Amount will be, or that the actual
Supplemental Redemption
 
                                       S-4
<PAGE>   5
 
Amount will even exceed zero. We have determined that this estimated yield will
equal      % per annum (compounded semiannually).
 
     Based upon this estimated yield, if you pay your taxes on a calendar year
basis and if you buy a Unit of Notes at original issue for $10 and hold the Unit
until maturity, you will be required to pay taxes on the following amounts of
ordinary income from the Unit each year: $     in 1998, $     in 1999, $     in
2000, $     in 2001, $     in 2002, $     in 2003, $     in 2004, and $     in
2005. However, in 2005, the amount of ordinary income that you will be required
to pay taxes on from owning a Unit of Notes may be greater or less than $     ,
depending upon the amount you receive at maturity. Also, if the sum of the
principal amount and the Supplemental Redemption Amount is less than $     , you
may have an ordinary (rather than capital) loss which you could deduct against
other income you may have in 2005. For further information, you should refer to
"Certain United States Federal Income Tax Considerations" in this Prospectus
Supplement. If you purchase the Notes at a time other than original issue or at
price other than $10, the tax consequences to you may be different.
 
WILL THE NOTES BE LISTED ON A STOCK EXCHANGE?
 
     We will apply to list the Notes on the Chicago Board Options Exchange (the
"CBOE") under the symbol "RSB". You should be aware that the listing of the
Notes on the CBOE will not necessarily ensure that a liquid trading market will
be available for the Notes. You should review the section "Risk Factors Relating
to the Notes -- Possible Illiquidity of the Secondary Market" in this Prospectus
Supplement.
 
WHAT IS THE ROLE OF OUR SUBSIDIARY, SALOMON SMITH BARNEY INC.?
 
     Our subsidiary, Salomon Smith Barney Inc. ("Salomon Smith Barney"), is the
underwriter for the offering and sale of the Notes. After the initial offering,
Salomon Smith Barney and/or other affiliates of the Company intend to buy and
sell Notes to create a secondary market for holders of the Notes, and may engage
in other activities described in "Underwriting". However, neither Salomon Smith
Barney nor any of these affiliates will be obligated to engage in any market
activities, or continue them once it has started.
 
     Salomon Smith Barney will also be our agent (the "Calculation Agent") for
purposes of calculating the Starting Value, the Adjusted Ending Value and the
Supplemental Redemption Amount and in determining whether a Market Disruption
Event (as defined below) has occurred. Potential conflicts of interest may exist
between Salomon Smith Barney and you as a holder of the Notes. Please refer to
"Risk Factors Relating to the Notes -- Affiliation of the Company and the
Calculation Agent" in this Prospectus Supplement.
 
CAN YOU TELL ME MORE ABOUT THE COMPANY?
 
     Salomon Smith Barney Holdings Inc. is a holding company that provides
investment banking, securities and commodities trading, brokerage, asset
management and other financial services through its subsidiaries. The Company is
a subsidiary of Travelers Group Inc. ("Travelers Group"), a diversified
financial services holding company. On April 6, 1998, Travelers Group and
Citicorp announced that they entered into a definitive agreement to combine in a
merger of equals. The transaction, which is expected to be completed during the
third quarter of 1998, is subject to various regulatory approvals, including
approval by the Federal Reserve Board.
 
     For additional information about the Company, you should refer to the
section "The Company" in the accompanying Prospectus. You should also read the
other documents the Company has filed with the Securities and Exchange
Commission (the "SEC"), which you can find by referring to the section "Where
You Can Find More Information" in the Prospectus.
 
ARE THERE ANY RISKS ASSOCIATED WITH MY INVESTMENT?
 
     Yes, the Notes are subject to a number of risks. Please refer to the
section "Risk Factors Relating to the Notes" in this Prospectus Supplement.
 
                                       S-5
<PAGE>   6
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents, filed by the Company with the SEC pursuant to
Section 13 of the Securities Exchange Act of 1934, as amended (the "Exchange
Act") (File No. 1-4346), are incorporated herein by reference: (i) the Annual
Report on Form 10-K for the year ended December 31, 1997, (ii) the Quarterly
Reports on Form 10-Q for the quarters ended March 31, 1998 and June 30, 1998 and
(iii) the Current Reports on Form 8-K filed on January 9, 1998, January 26,
1998, February 2, 1998, March 3, 1998, April 17, 1998, April 20, 1998, May 13,
1998, June 8, 1998, June 10, 1998, June 17, 1998, July 17, 1998, July 20, 1998,
July 22, 1998, July 30, 1998 and September 1, 1998. You should refer to "The
Company -- Where You Can Find More Information" and "Incorporation of Certain
Documents by Reference" in the Prospectus. These documents may also be accessed
electronically by means of the SEC's home page on the world wide web on the
internet at "http://www.sec.gov."
 
                                       S-6
<PAGE>   7
 
                       RISK FACTORS RELATING TO THE NOTES
 
     An investment in the Notes entails significant risks not associated with
similar investments in a conventional debt security, including the following:
 
COMPARISON TO OTHER SECURITIES
 
     The Supplemental Redemption Amount May Be Zero.  Unless the Adjusted Ending
Value exceeds the closing value of the Russell 2000 Index on the date of this
Prospectus Supplement (i.e., the Starting Value), the Supplemental Redemption
Amount will be ZERO. This may be true even if the value of the Russell 2000
Index, as reduced by the Adjustment Factor, exceeds the Starting Value at some
time during the life of the Notes but later falls below that threshold. If the
Supplemental Redemption Amount is zero, we will pay you only the principal
amount of your Notes at maturity.
 
     The Adjusted Ending Value Will Be Determined during the      Months Prior
to Maturity. Because the Adjusted Ending Value will be based upon the closing
value of the Russell 2000 Index on the      of each month during the      -month
Calculation Period prior to maturity, as adjusted by the Adjustment Factor, a
significant increase in the Index subsequent to issuance may be substantially or
entirely offset by subsequent decreases in the value of the Index during or
prior to the Calculation Period, and a high Index value at the close of one or
more months during the Calculation Period may be substantially offset by a low
Index value at the close of one or more other months during the Calculation
Period.
 
     In addition, the use of an average over the Calculation Period, rather than
one closing Index value at maturity, to calculate the Adjusted Ending Value
could result in a lower or higher payment at maturity than would otherwise be
the result. In particular, if the Index generally increases over the Calculation
Period, then the payment on the Notes will be lower, and could be materially
lower, than would be the case if one closing Index value at maturity were used.
 
     No Periodic Interest.  No periodic payments of interest will be made on the
Notes or the principal amount thereof. However, the payment of a Supplemental
Redemption Amount at maturity, if that amount exceeds zero, may be deemed to be
interest.
 
     Yield May Be Lower than the Yield on a Standard Debt Security of Comparable
Maturity.  The amount we pay you at maturity may be less than the return you
could earn on other investments. Because the Adjusted Ending Value of the
Russell 2000 Index may be less than, equal to or only slightly greater than the
Starting Value, the effective yield to maturity on the Notes (which is linked to
the amount by which the Adjusted Ending Value exceeds the Starting Value) may be
less than that which would be payable on a conventional fixed-rate, non-callable
debt security of the Company. In addition, any such return may not fully
compensate you for any opportunity cost to you when you take into account
inflation and other factors relating to the time value of money.
 
     Return Does Not Reflect Dividends.  Your return on the Notes will not
reflect the return you would realize if you actually owned the stocks underlying
the Index and received the dividends paid on those stocks because of the
reduction caused by the Adjustment Factor and because Russell calculates the
Index by reference to the prices of the stocks comprising the Index without
taking into consideration the value of dividends paid on those stocks.
 
     Effect of Adjustment Factor.  Because the actual index values of the
Russell 2000 Index during the Calculation Period will be reduced by the
Adjustment Factor in order to determine the Adjusted Ending Value, your return
on the Notes will be less than your return on a similar indexed instrument that
was directly linked to the Russell 2000 Index, but was not subject to such
adjustment.
 
RELATIONSHIP OF THE NOTES AND THE RUSSELL 2000 INDEX
 
     The historical Russell 2000 Index values should not be taken as an
indication of the future performance of the Index during the term of the Notes.
Since July 1, 1998, the Russell 2000 Index has declined significantly
(approximately 25% as of September 10, 1998). A continuation of the decline and
volatility of the
 
                                       S-7
<PAGE>   8
 
Russell 2000 Index could adversely affect the value of the Notes. While the
trading prices of the stocks underlying the Index will determine the value of
the Russell 2000 Index, it is impossible to predict whether the value of the
Index will fall or rise. Trading prices of the stocks underlying the Russell
2000 Index will be influenced by both the complex and interrelated political,
economic, financial and other factors that can affect the capital markets
generally and the equity trading markets on which the underlying stocks are
traded, and by various circumstances that can influence the values of the
underlying stocks in a specific market segment or a particular underlying stock.
 
     The policies of Russell concerning additions, deletions and substitutions
of the stocks underlying the Russell 2000 Index and the manner in which Russell
takes account of certain changes affecting such underlying stock may affect the
value of the Index. The policies of Russell with respect to the calculation of
the Index could also affect the value of the Index. Russell may discontinue or
suspend calculation or dissemination of the Russell 2000 Index or materially
alter the methodology by which it calculates the Index. Any such actions could
affect the value of the Notes. See "The Russell 2000 Index" below.
 
POSSIBLE ILLIQUIDITY OF SECONDARY MARKET
 
     We will apply to list the Notes on the CBOE. However, there can be no
assurance as to whether there will be a secondary market in the Notes or if
there were to be such a secondary market, whether such market would be liquid or
illiquid. If the secondary market for the Notes is limited, there may be few
buyers when you decide to sell your Notes if you do not wish to hold your
investment until maturity. This may affect the price you receive. There is
currently no secondary market for the Notes.
 
FACTORS AFFECTING TRADING VALUE OF THE NOTES
 
     We believe that the value of the Notes in the secondary market will be
affected by the value of the Index and by a number of other factors. Some of
these factors are interrelated in complex ways; as a result, the effect of any
one factor may be offset or magnified by the effect of another factor. The price
at which you will be able to sell the Notes prior to maturity may be at a
discount, which could be substantial, from the principal amount thereof, if, at
such time, the value of the Index is less than, equal to, or not sufficiently
above the Starting Value. The following paragraphs describe what we expect to be
the impact on the market value of the Notes of a change in a specific factor,
assuming all other conditions remain constant.
 
     Index Value.  We expect that the market value of the Notes will likely
depend substantially on the amount, if any, by which the current Index value, as
reduced by the Adjustment Factor, exceeds the Starting Value. If you choose to
sell your Notes when the value of the Index exceeds the Starting Value, you may
receive substantially less than the amount that would be payable at maturity
based on that Index value because of expectations that the Index will continue
to fluctuate until the Adjusted Ending Value is determined. If you choose to
sell your Notes when the value of the Index is below the Starting Value, you can
expect to receive less than the $10 principal amount per Unit of Notes. In
general, rising U.S. dividend rates (i.e., dividends per share) may increase the
value of the Index, while falling U.S. dividend rates may decrease the value of
the Index. Political, economic and other developments that affect the stocks
underlying the Index may also affect the value of the Index and the value of the
Notes. The effect of the current Index value on the market value of the Notes
will likely decrease significantly over time during the      -month Calculation
Period because a portion of the Adjusted Ending Value will be determined on each
of the      Calculation Days during such period.
 
     Interest Rates.  Because the Notes repay, at a minimum, the principal
amount at maturity, we expect that the trading value of the Notes will be
affected by changes in interest rates. In general, if U.S. interest rates
increase, the trading value of the Notes may be adversely affected. If U.S.
interest rates decrease, the trading value of the Notes may be favorably
affected. Interest rates may also affect the U.S. economy and, in turn, the
value of the Index, which (for the reasons discussed above) would affect the
value of the Notes. Rising U.S. interest rates may lower the value of the Index
and, thus, the Notes. Falling U.S. interest rates may increase the value of the
Index and, thus, the Notes.
 
                                       S-8
<PAGE>   9
 
     Volatility of the Index.  Volatility is the term used to describe the size
and frequency of market fluctuations. If the volatility of the Index increases,
the trading value of the Notes may be favorably affected. If the volatility of
the Index decreases, the trading value of the Notes may be adversely affected.
The effect of the volatility of the Index on the market value of the Notes is
likely to decrease over time during the Calculation Period because a portion of
the Adjusted Ending Value will be determined on the      of each month during
such      -month period.
 
     Time Remaining to Maturity.  The Notes may trade at a value above that
which would be expected based on the level of interest rates and the Index. Any
such difference will reflect a "time premium" resulting from expectations
concerning the value of the Index during the      -month Calculation Period
prior to the maturity of the Notes. However, as the time remaining to the
maturity of the Notes decreases, particularly during the      -month Calculation
Period, this time premium may decrease, adversely affecting the trading value of
the Notes.
 
     Dividend Yields.  If dividend yields on the underlying stocks comprising
the Index increase, we expect that the value of the Notes may be adversely
affected, since the Index does not incorporate the value of such payments.
Conversely, if dividend yields on the stocks comprising the Index decrease, the
value of the Notes may be favorably affected.
 
     Company Credit Ratings, Financial Condition and Results.  Actual or
anticipated changes in the Company's credit ratings, financial condition or
results may affect the market value of the Notes.
 
     Economic Conditions and Earnings Performance of Underlying
Companies.  General economic conditions and the earnings results of the
companies whose common stocks comprise the Index and real or anticipated changes
in such conditions or results may affect the value of the Index and the market
value of the Notes.
 
     We want you to understand that the impact of one of the factors specified
above, such as an increase in interest rates, may offset some or all of any
change in the trading value of the Notes attributable to another factor, such as
an increase in the Index value.
 
     In general, assuming all relevant factors are held constant, we expect that
the effect on the trading value of the Notes of a given change in most of the
factors listed above will be less if it occurs later in the term of the Notes
than if it occurs earlier in the term of the Notes.
 
SMALL CAPITALIZATION STOCKS
 
     The underlying stocks that constitute the Index have been issued by
corporations domiciled in the U.S. and its territories and traded on the NYSE,
the AMEX or in the over-the-counter market. If a Successor Index is substituted
for the Index as described below, such Successor Index would also be based upon
stocks issued by corporations domiciled in the U.S. and its territories and
traded on the NYSE, the AMEX or in the over-the-counter market. You should be
aware that investments in securities indexed to the value of small
capitalization companies involve certain risks. In general, the corporations
issuing the stocks comprising the Index have smaller market capitalizations,
less trading liquidity and greater price volatility than the issuers of stocks
that comprise other larger capitalization indexes (such as the Standard & Poor's
500 Index) which are designed to measure the broad movement of the U.S. stock
markets. These factors could result in larger fluctuations in the value of the
Index and the Notes than would be the case for large capitalization indexes
during certain periods of market decline or uncertainty. Such volatility could
adversely affect the value of the Index and the Notes.
 
AFFILIATION OF THE COMPANY AND CALCULATION AGENT
 
     Because the Calculation Agent is an affiliate of the Company, potential
conflicts of interest may exist between the Calculation Agent and the holders of
the Notes, including with respect to certain determinations and judgments that
the Calculation Agent must make in determining the Adjusted Ending Value and the
Supplemental Redemption Amount or whether a Market Disruption Event has
occurred. You should refer to "Description of the Notes -- Market Disruption
Events", "-- Discontinuance of the Russell 2000 Index" and
                                       S-9
<PAGE>   10
 
"-- Alteration of Method of Calculation" below. Salomon Smith Barney, as a
registered broker-dealer, is required to maintain policies and procedures
regarding the handling and use of confidential proprietary information, and such
policies and procedures will be in effect throughout the term of the Notes to
restrict the use of information relating to the calculation of the Index values
that the Calculation Agent may be required to make prior to their dissemination.
Salomon Smith Barney is obligated to carry out its duties and functions as
Calculation Agent in good faith and using its reasonable judgment. Salomon Smith
Barney may also engage in certain activities in connection with hedging the
Company's obligation under the Notes. You should refer to "Use of Proceeds and
Hedging" in the accompanying Prospectus.
 
PURCHASES AND SALES BY AFFILIATES OF THE COMPANY
 
     The Company, Salomon Smith Barney and other affiliates of the Company may
from time to time buy or sell the stocks underlying the Index or derivative
instruments related to the Index for their own accounts in connection with their
normal business practices or in connection with hedging the Company's
obligations under the Notes. These transactions could affect the price of such
stocks or the value of the Index.
 
POTENTIAL FEDERAL INCOME TAX CONSEQUENCES
 
     Because the Notes will be treated as contingent payment debt obligations of
the Company, and because by accepting a Note holders thereof agree to this
treatment of the Notes, U.S. holders of a Note will be required to include
original issue discount for U.S. federal income tax purposes ("Tax OID") in
their gross income on a constant yield basis over the term of such Note. Such
Tax OID will be includible in a U.S. holder's gross income for U.S. federal
income tax purposes (as ordinary income) over the life of the Note, even though
no payments are to be made on the Note except at maturity. The amount of Tax OID
is calculated based (in part) on an assumed amount payable at maturity. This
assumed amount is neither a prediction nor guarantee of the actual amount
payable at maturity. Furthermore, if the amount actually paid at maturity is, in
fact, less than the assumed amount payable at maturity, a U.S. holder will have
recognized taxable income in periods prior to maturity that exceed such holder's
economic income from the holding of the Note during such periods (with an
offsetting ordinary loss at the maturity of the Note). A U.S. holder will also
be required to treat any gain recognized upon a sale of a Note as ordinary
income (rather than capital gain). You should refer to "Certain United States
Federal Income Tax Considerations" in this Prospectus Supplement.
 
OTHER CONSIDERATIONS
 
     If a bankruptcy proceeding is commenced in respect of the Company, the
claim of a holder of Notes may, under Section 502(b)(2) of Title 11 of the
United States Code, be limited to the principal amount of such Notes plus a
Supplemental Redemption Amount, if any, calculated as though the maturity date
of the Notes were the date of the commencement of the proceeding.
                            ------------------------
 
     We suggest that prospective investors who consider purchasing the Notes
reach an investment decision only after carefully considering the suitability of
the Notes in light of their particular circumstances.
 
                                      S-10
<PAGE>   11
 
                            DESCRIPTION OF THE NOTES
 
     The following description of the particular terms of the Notes offered
hereby (referred to in the accompanying Prospectus as the "Offered Securities")
supplements the description of the general terms and provisions of the Debt
Securities set forth in the Prospectus, to which description reference is hereby
made. The following summary of the Notes is qualified in its entirety by
reference to the Senior Debt Indenture referred to in the Prospectus.
 
GENERAL
 
     The Principal-Protected Equity Linked Notes based upon the Russell 2000
Index (the "Notes") are a series of Debt Securities issued under the Senior Debt
Indenture described in the accompanying Prospectus. The aggregate principal
amount of Notes issued will be limited to $     (     Units). The Notes will
mature on      , 2005, will constitute part of the senior debt of the Company
and will rank pari passu with all other unsecured and unsubordinated debt of the
Company. The Notes will be issued only in fully registered form and in
denominations of $10 (one Unit) and integral multiples thereof.
 
     The "Trustee" under the Senior Debt Indenture will be The Bank of New York
under an indenture dated as of October 27, 1993, as amended from time to time. A
copy of the Senior Debt Indenture under which The Bank of New York serves as
Trustee has been filed with the SEC as an exhibit to the Registration Statement
of which the accompanying Prospectus forms a part and is hereby incorporated by
reference as part of the Registration Statement. Section numbers in the Bank of
New York Indenture take the form "1.01", "2.01" and so forth, rather than "101",
"201" and so forth. Section references in the accompanying Prospectus should be
read accordingly.
 
     Reference is made to the accompanying Prospectus for a detailed summary of
additional provisions of the Notes and of the Senior Debt Indenture under which
the Notes will be issued.
 
INTEREST
 
     No interest is payable on the Notes or the principal amount thereof, other
than in connection with a default on payment at maturity or to the extent that
the Supplemental Redemption Amount exceeds zero and is deemed to be an interest
payment.
 
REDEMPTION; DEFEASANCE
 
     The Notes are not subject to redemption by the Company or at the option of
any holder prior to maturity and are not subject to the defeasance provisions
described in the accompanying Prospectus under "Description of Debt Securities
- -- Defeasance".
 
PAYMENT AT MATURITY
 
     At maturity (including as a result of acceleration or otherwise), a holder
of a Note will be entitled to receive the principal amount thereof plus a
Supplemental Redemption Amount, if any, determined as provided below. If the
Adjusted Ending Value does not exceed the Starting Value, the holder of a Note
will be entitled to receive only the principal amount thereof. The principal
amount will equal $10 per Unit of Notes.
 
DETERMINATION OF THE SUPPLEMENTAL REDEMPTION AMOUNT
 
     The Supplemental Redemption Amount for each Unit of Notes ($10 principal
amount) will be determined by the Calculation Agent and will equal:
 
<TABLE>
  <S>     <C>
               Adjusted Ending Value - Starting Value
  $10 X    ------------------------------------------------
                          Starting Value
</TABLE>
 
provided, however, that in no event will the Supplemental Redemption Amount be
less than zero. As indicated in the formula above, the Supplemental Redemption
Amount for the Notes will be calculated using the principal amount of the Notes.
 
                                      S-11
<PAGE>   12
 
     The "Adjusted Ending Value" will be determined by the Calculation Agent and
will equal the average (arithmetic mean) of the closing values of the Index on
each of the      Calculation Days during the Calculation Period, multiplied by
the Adjustment Factor. If the      of any month during the Calculation Period is
not a Calculation Day because it is not an Index Business Day or due to the
occurrence of one or more Market Disruption Events, then the Index value for
that month of the Calculation Period will equal the closing value of the Russell
2000 Index determined on the next Index Business Day on which no Market
Disruption Event exists, except that if      , 2005 is not a Calculation Day for
any reason, then the Index value for      2005 will equal the closing value of
the Russell 2000 Index determined on the immediately preceding Index Business
Day on which no Market Disruption Event exists.
 
     The "Adjustment Factor" will equal      % per annum, and will be applied
pro rata on a daily basis to reduce the value of the Index during the term of
the Notes. We will determine the Adjustment Factor on the Pricing Date and
disclose it to you in the final Prospectus Supplement delivered to you in
connection with sales of the Notes. The Adjustment Factor is expected to be
between 1.25% and 1.75% per annum. As a result of its application, the Adjusted
Ending Value used to calculate the Supplemental Redemption Amount at the stated
maturity of the Notes is expected to be 8.42% to 11.63% less than the actual
average of the Index values on the      Calculation Days during the Calculation
Period. If the Adjusted Ending Value is calculated with respect to a date
earlier than the stated maturity of the Notes, the Adjustment Factor will be
reduced pro rata to reflect the number of days elapsed between the Pricing Date
and such date.
 
     The "Starting Value" will equal the closing value of the Index on the
Pricing Date. We will determine the Starting Value on the Pricing Date and
disclose it to you in the final Prospectus Supplement delivered to you in
connection with sales of the Notes.
 
     The "Calculation Period" means the period from and including the date that
is expected to be between 24 and 48 months prior to the maturity date to but
excluding the maturity date. We will determine the Calculation Period on the
Pricing Date and disclose it to you in the final Prospectus Supplement delivered
to you in connection with sales of the Notes. A "Calculation Day" means the
     of each month during the Calculation Period, provided that such day is an
Index Business Day and no Market Disruption Event has occurred on such day.
 
     For purposes of determining the Adjusted Ending Value, an "Index Business
Day" is a day on which trading is generally conducted (i) on the NYSE, the AMEX,
and the NASDAQ National Market, (ii) on the Chicago Mercantile Exchange (the
"CME"), (iii) on the CBOE and (iv) in the over-the-counter market for equity
securities in the United States, and the Index or any Successor Index, as
defined below, is calculated and published. The Calculation Agent may, in its
discretion, add to (or delete from) the definition of Index Business Day any
other major U.S. exchange which commences to serve (or ceases to serve) as the
primary exchange upon which a stock underlying the Index trades or as an
exchange upon which a futures contract, an option on a futures contract or an
option contract relating to the Index trades. All determinations made by the
Calculation Agent shall be at the sole discretion of the Calculation Agent and
shall be conclusive for all purposes and binding on the Company and beneficial
owners of the Notes, absent manifest error.
 
HYPOTHETICAL RETURNS
 
     The following table illustrates, for a range of hypothetical average values
of the Index during the      - month Calculation Period and based upon a
hypothetical Starting Value of 344.97 and a seven-year maturity for the Notes,
(i) the hypothetical Adjusted Ending Value used to calculate the Supplemental
Redemption Amount; (ii) the percentage change from the hypothetical Starting
Value to the hypothetical Adjusted Ending Value; (iii) the hypothetical total
amount payable per Note; (iv) the hypothetical total rate of return on the
Notes; (v) the hypothetical pretax annualized rate of return on the Notes; and
(vi) the hypothetical pretax annualized rate of return of the stocks underlying
the Index (which includes an assumed aggregate dividend yield of 1.61% per
annum, as more fully described below). The calculations in this table assume an
Adjustment Factor of 1.50% per annum (or 10.0391% over the term of the Notes),
the midpoint of the expected range of 1.25% to 1.75%.
 
                                      S-12
<PAGE>   13
<TABLE>
<CAPTION>
    HYPOTHETICAL                          PERCENTAGE CHANGE       TOTAL AMOUNT                           PRETAX
    AVERAGE INDEX        HYPOTHETICAL     OF ADJUSTED ENDING   PAYABLE AT MATURITY   TOTAL RATE OF   ANNUALIZED RATE
  VALUE DURING THE         ADJUSTED         VALUE OVER THE      PER $10 PRINCIPAL      RETURN ON      OF RETURN OF
CALCULATION PERIOD(1)   ENDING VALUE(2)     STARTING VALUE       AMOUNT OF NOTES       THE NOTES      THE NOTES(3)
- ---------------------   ---------------   ------------------   -------------------   -------------   ---------------
<S>                     <C>               <C>                  <C>                   <C>             <C>
       241.48               217.24              -37.03%              $10.00                0.00%           0.00%
       275.98               248.27              -28.03%              $10.00                0.00%           0.00%
       310.47               279.30              -19.04%              $10.00                0.00%           0.00%
       344.97(5)            310.34              -10.04%              $10.00                0.00%           0.00%
       379.47               341.37               -1.04%              $10.00                0.00%           0.00%
       413.96               372.41                7.95%              $10.80                7.95%           1.10%
       448.46               403.44               16.95%              $11.69               16.95%           2.25%
       482.96               434.47               25.95%              $12.59               25.95%           3.32%
       517.46               465.51               34.94%              $13.49               34.94%           4.32%
       551.95               496.54               43.94%              $14.39               43.94%           5.27%
       586.45               527.57               52.93%              $15.29               52.93%           6.16%
       620.95               558.61               61.93%              $16.19               61.93%           7.00%
       655.44               589.64               70.93%              $17.09               70.93%           7.80%
       689.94               620.68               79.92%              $17.99               79.92%           8.56%
       724.44               651.71               88.92%              $18.89               88.92%           9.29%
       758.93               682.74               97.91%              $19.79               97.91%           9.99%
       793.43               713.78              106.91%              $20.69              106.91%          10.65%
       827.93               744.81              115.91%              $21.59              115.91%          11.29%
       862.43               775.84              124.90%              $22.49              124.90%          11.91%
 

<CAPTION>
 PRETAX ANNUALIZED
 RATE OF RETURN ON
 STOCKS UNDERLYING
  THE INDEX(3)(4)
 -----------------
 <C>                         <C>
       -3.42%
       -1.55%
        0.11%
        1.61%
        2.98%
        4.25%
        5.42%
        6.51%
        7.53%
        8.49%
        9.40%
       10.26%
       11.08%
       11.86%
       12.61%
       13.32%
       14.01%
       14.67%
       15.30%
</TABLE>
 
- ---------------
 
(1) The actual average Index value, for purposes of calculating the Supplemental
    Redemption Amount at stated maturity, will be equal to the average of the
    Index values on each of the Calculation Days during the   -month Calculation
    Period. The Calculation Period is expected to be between 24 and 48 months
    prior to maturity.
 
(2) The actual Adjusted Ending Value, for purposes of calculating the
    Supplemental Redemption Amount at stated maturity, will be equal to the
    actual average Index value reduced by the Adjustment Factor.
 
(3) These annualized rates of return are calculated on a semi-annual
    bond-equivalent basis.
 
(4) This rate of return assumes: (i) an investment of a fixed amount in the
    stocks underlying the Index with the allocation of such amounts reflecting
    the relative weights of such stocks in the Index; (ii) a constant dividend
    yield of 1.61% per annum, paid quarterly from the date of initial delivery
    of Notes, applied to the value of the Index at the end of each such quarter
    assuming such value increases or decreases linearly from the Starting Value
    to the hypothetical Index value during the Calculation Period; (iii) no
    transaction fees or expenses; (iv) a seven-year maturity of the Notes from
    date of issue; and (v) a final Index value equal to the hypothetical average
    Index value during the Calculation Period.
 
(5) The Hypothetical Starting Value. For purposes of this illustration, the
    Starting Value is assumed to be the Index value on September 10, 1998. The
    actual Starting Value will equal the closing value of the Index on the
    Pricing Date, and will be disclosed in the final Prospectus Supplement
    delivered to you in connection with the sale of the Notes.
 
     The above figures are for purposes of illustration only. The actual
Supplemental Redemption Amount received by investors and the total and pretax
rate of return resulting therefrom will depend entirely on the Starting Value,
the actual Adjusted Ending Value and the actual Adjustment Factor determined by
the actual Calculation Agent as provided herein. In particular, the actual
Adjusted Ending Value could be lower or higher than those reflected in the
table. Historical data regarding the Russell 2000 Index is included in this
Prospectus Supplement under "The Russell 2000 Index -- Historical Data on the
Index".
 
                                      S-13
<PAGE>   14
 
MARKET DISRUPTION EVENTS
 
     "Market Disruption Event" means any of the following events, as determined
by the Calculation Agent:
 
          (a) The suspension or material limitation of trading in 20% or more of
     the underlying stocks which then comprise the Russell 2000 Index or any
     Successor Index, in each case, for more than two hours of trading or during
     the one-half hour period preceding the close of trading on the applicable
     organized U.S. exchange or in the applicable U.S. market. For purposes of
     this definition, limitations on trading during significant market
     fluctuations imposed pursuant to NYSE Rule 80B (or any applicable rule or
     regulation enacted or promulgated by the NYSE, any other self regulatory
     organization or the SEC of similar scope or as a replacement for Rule 80B,
     as determined by the Calculation Agent) shall be considered "material".
 
          (b) The suspension or material limitation, in each case, for more than
     two hours of trading or during the one-half hour period preceding the close
     of trading (whether by reason of movements in price otherwise exceeding
     levels permitted by the relevant exchange or otherwise) in (A) futures
     contracts related to the Index or any Successor Index or options on such
     futures contracts which are traded on the CME or any other major U.S.
     exchange or (B) options contracts related to the Index or any Successor
     Index which are traded on the CBOE or any other major U.S. exchange.
 
          (c) The unavailability, through a recognized system of public
     dissemination of transaction information, for more than two hours of
     trading or during the one-half hour period preceding the close of trading,
     of accurate price, volume or related information in respect of 20% or more
     of the underlying stocks which then comprise the Index or any Successor
     Index or in respect of futures contracts related to the Index or any
     Successor Index, options on such futures contracts or options contracts
     related to the Index or any Successor Index, in each case traded on any
     major U.S. exchange.
 
     For purposes of determining whether a Market Disruption Event has occurred:
(1) a limitation on the hours or number of days of trading will not constitute a
Market Disruption Event if it results from an announced change in the regular
business hours of the relevant exchange or market, (2) a decision to discontinue
permanently trading in the relevant futures or options contract will not
constitute a Market Disruption Event, (3) any suspension in trading in a futures
or options contract on the Index or any Successor Index by a major securities
market by reason of (x) a price change violating limits set by such securities
market, (y) an imbalance of orders relating to such contracts or (z) a disparity
in bid and ask quotes relating to such contracts, will constitute a Market
Disruption Event, notwithstanding that such suspension or material limitation is
less than two hours, and (4) a "suspension or material limitation" on an
exchange or in a market will include a suspension or material limitation of
trading by one class of investors provided that such suspension continues for
more than two hours of trading or during the last one-half hour period preceding
the close of trading on the relevant exchange or market (but will not include
limitations imposed on certain types of trading under NYSE Rule 80A or any
applicable rule or regulation enacted or promulgated by the NYSE, any other
self-regulatory organization or the SEC of a similar scope or as a replacement
for Rule 80A, as determined by the Calculation Agent) and will not include any
time when such exchange or market is closed for trading as part of such
exchange's or market's regularly scheduled business hours. Under certain
circumstances, the duties of Salomon Smith Barney as Calculation Agent in
determining the existence of Market Disruption Events could conflict with the
interests of Salomon Smith Barney as an affiliate of the issuer of the Notes.
 
     Based on the information currently available to the Company, on October 27,
1997, the NYSE suspended all trading during the one-half hour period preceding
the close of trading, pursuant to NYSE Rule 80B. On April 3, 1992, no trading
took place on the CME as a flood that severely affected the operations of many
of the CME's member institutions caused the CME to suspend trading (including
trading in futures or options contracts on the Index) for the entire day; if
this suspension of trading had occurred during the term of the Notes, such event
would have constituted a Market Disruption Event. The existence or non-existence
of such circumstances, however, is not necessarily indicative of the likelihood
of such circumstances arising or not arising in the future.
 
                                      S-14
<PAGE>   15
 
DISCONTINUANCE OF THE RUSSELL 2000 INDEX
 
     If Russell discontinues publication of the Russell 2000 Index and Russell
or another entity publishes a successor or substitute index that the Calculation
Agent determines, in its sole discretion, to be comparable to such Index (any
such index being referred to hereinafter as a "Successor Index"), then the
Adjusted Ending Value shall be determined by reference to the value of such
Successor Index using the methodology described above under "-- Determination of
the Supplemental Redemption Amount".
 
     Upon any selection by the Calculation Agent of a Successor Index, the
Company shall cause notice thereof to be furnished to the Company and the
Trustee, who shall provide notice thereof to the holders of the Notes.
 
     If Russell discontinues publication of the Index and a Successor Index is
not selected by the Calculation Agent or is no longer published on any
Calculation Day, the value to be substituted for the Index for any such
Calculation Day used to calculate the Supplemental Redemption Amount at maturity
will be a value computed by the Calculation Agent for such Calculation Day in
accordance with the procedures last used to calculate the Index prior to any
such discontinuance.
 
     If Russell discontinues publication of the Index prior to the period during
which the Supplemental Redemption Amount is to be determined and the Calculation
Agent determines that no Successor Index is available at such time, then on each
Index Business Day until the earlier to occur of (a) the determination of the
Adjusted Ending Value and (b) a determination by the Calculation Agent that a
Successor Index is available, the Calculation Agent shall determine the value
that would be used in computing the Supplemental Redemption Amount as described
in the preceding paragraph as if such day were a Calculation Day. The
Calculation Agent will cause notice of each such value to be published not less
often than once each month in The Wall Street Journal (or another newspaper of
general circulation), and arrange for information with respect to such values to
be made available by telephone. Notwithstanding these alternative arrangements,
discontinuance of the publication of the Index may adversely affect trading in
the Notes.
 
     If a Successor Index is selected or the Calculation Agent calculates a
value as a substitute for the Russell 2000 Index as described above, such
Successor Index or value shall be substituted for the Russell 2000 Index for all
purposes, including for purposes of determining whether an Index Business Day
occurs or a Market Disruption Event exists. Notwithstanding these alternative
arrangements, discontinuance of the publication of the Russell 2000 Index may
adversely affect the value of the Notes.
 
ALTERATION OF METHOD OF CALCULATION
 
     If at any time the method of calculating the Russell 2000 Index or a
Successor Index, or the value thereof, is changed in any material respect, or if
the Index or a Successor Index is in any other way modified so that such Index
does not, in the opinion of the Calculation Agent, fairly represent the value of
the Index or such Successor Index had such changes or modifications not been
made, then, from and after such time, the Calculation Agent shall, at the close
of business in New York, New York, on each date that the closing value with
respect to the Adjusted Ending Value is to be calculated, make such adjustments
as, in the good faith judgment of the Calculation Agent, may be necessary in
order to arrive at a calculation of a value of a stock index comparable to the
Index or such Successor Index as if changes or modifications had not been made,
and calculate such closing value with reference to the Index, as adjusted.
Accordingly, if the method of calculating the Index or such Successor Index is
modified so that the value of such Index or such Successor Index is a fraction
or a multiple of what it would have been if it had not been modified (e.g., due
to a split in such Index), then the Calculation Agent shall adjust such Index in
order to arrive at a value of such Index as if it had not been modified (e.g.,
as if such split had not occurred).
 
EVENTS OF DEFAULT AND ACCELERATION
 
     In case an Event of Default (as defined in the accompanying Prospectus)
with respect to any Notes shall have occurred and be continuing, the amount
declared due and payable upon any acceleration of the Notes will be determined
by the Calculation Agent and will equal, for each Note, the principal amount
plus the Supplemental Redemption Amount, if any, calculated as though the
maturity date of the Notes were the date of early repayment. See
"-- Determination of the Supplemental Redemption Amount" above. If a bankruptcy
proceeding is commenced in respect of the Company, the claim of the beneficial
owner of a Note may be limited, under Section 502(b)(2) of Title 11 of the
United States Code, to the principal amount of the Note
 
                                      S-15
<PAGE>   16
 
plus an additional amount of contingent interest calculated as though the
maturity date of the Notes were the date of the commencement of the proceeding.
 
     In case of default in payment at the maturity date of the Notes (whether at
their stated maturity or upon acceleration), from and after the maturity date
the Notes shall bear interest, payable upon demand of the beneficial owners
thereof, at the rate of      % per annum on the unpaid amount due and payable on
such date in accordance with the terms of the Notes to the date payment of such
amount has been made or duly provided for.
 
BOOK-ENTRY SYSTEM
 
     Upon issuance, all Notes will be represented by one or more
fully-registered global securities (the "Global Notes"). Each such Global Note
will be deposited with, or on behalf of the Depositary, and registered in the
name of the Depositary or a nominee thereof. Unless and until it is exchanged in
whole or in part for Notes in definitive form, no Global Note may be transferred
except as a whole by the Depositary to a nominee of the Depositary or by a
nominee of the Depositary to the Depositary or another nominee of the Depositary
or by the Depositary or any such nominee to a successor of the Depositary or a
nominee of such successor. Accountholders in the Euroclear or Cedel Bank
clearance systems may hold beneficial interests in the Notes through the
accounts each such system maintains as a participant in the Depositary.
 
     The Depositary has advised the Company as follows: the Depositary is a
limited-purpose trust company organized under the New York Banking Law, a
"banking organization" within the meaning of the New York Banking Law, a member
of the Federal Reserve System, a "clearing corporation" within the meaning of
the New York Uniform Commercial Code and a "clearing agency" registered pursuant
to the provisions of Section 17A of the Exchange Act. The Depositary holds
securities that its participants ("Participants") deposit with the Depositary.
The Depositary also facilitates the settlement among Participants of securities
transactions, such as transfers and pledges, in deposited securities through
electronic computerized book-entry changes in Participants' accounts, thereby
eliminating the need for physical movement of securities certificates. Direct
Participants include securities brokers and dealers, banks, trust companies,
clearing corporations and certain other organizations ("Direct Participants").
The Depositary is owned by a number of its Direct Participants and by the NYSE,
the AMEX and the National Association of Securities Dealers, Inc. Access to the
Depositary system is also available to others, such as securities brokers and
dealers, banks and trust companies that clear transactions through or maintain a
custodial relationship with a Direct Participant, either directly or indirectly.
The rules applicable to the Depositary and its Participants are on file with the
Commission.
 
     A further description of the Depositary's procedures with respect to the
Global Notes is set forth in the Prospectus under "Description of Debt
Securities -- Global Notes". The Depositary has confirmed to the Company, the
Underwriter and the Trustee that it intends to follow such procedures.
 
SAME-DAY SETTLEMENT AND PAYMENT
 
     Settlement for the Notes will be made by the Underwriter in same-day funds.
All payments of principal and the Supplemental Redemption Amount, if any, will
be made by the Company in same-day funds so long as the Notes are maintained in
book-entry form.
 
CALCULATION AGENT
 
     The Calculation Agent for the Notes will be Salomon Smith Barney. All
determinations made by the Calculation Agent shall be at the sole discretion of
the Calculation Agent and shall, in the absence of manifest error, be conclusive
for all purposes and binding on the Company and holders of the Notes. Because
the Calculation Agent is an affiliate of the Company, potential conflicts of
interest may exist between the Calculation Agent and the holders of the Notes,
including with respect to certain determinations and judgments that the
Calculation Agent must make in determining the Adjusted Ending Value and the
Supplemental Redemption Amount or whether a Market Disruption Event has
occurred. See "-- Market Disruption Events", "-- Discontinuance of the Russell
2000 Index" and "-- Alteration of Method of Calculation" above. Salomon Smith
Barney is obligated to carry out its duties and functions as Calculation Agent
in good faith and using its reasonable judgment.
 
                                      S-16
<PAGE>   17
 
                             THE RUSSELL 2000 INDEX
 
GENERAL
 
     Unless otherwise stated, all information herein on the Index is derived
from Russell or other publicly available sources. Such information reflects the
policies of Russell as stated in such sources and such policies are subject to
change by Russell. Russell is under no obligation to continue to publish the
Index and may discontinue publication of the Index at any time.
 
     The Index is an index calculated, published and disseminated by Russell,
and measures the composite price performance of stocks of 2,000 companies
domiciled in the U.S. and its territories. All 2,000 stocks are traded on either
the NYSE or the AMEX or in the over-the-counter market and form a part of the
Russell 3000(R) Index. The Russell 3000 Index is composed of the 3,000 largest
U.S. companies as determined by market capitalization and represents
approximately 98% of the investable U.S. equity market. As of August 31, 1998,
the average market capitalization of companies included in the Russell 3000
Index was $3.7 billion.
 
     The Index consists of the smallest 2,000 companies included in the Russell
3000 Index and represents approximately 11% of the total market capitalization
of the Russell 3000 Index. The Index is designed to track the performance of the
small capitalization segment of the U.S. equity market. As of August 31, 1998,
the market capitalization of the stocks in the Russell 2000 Index ranged from
approximately $222 million to $1.4 billion, with the average market
capitalization being $592 million.
 
     Only common stocks belonging to corporations domiciled in the U.S. and its
territories are eligible for inclusion in the Russell 3000 Index and the Index.
Stocks traded on U.S. exchanges but domiciled in other countries are excluded.
Preferred stock, convertible preferred stock, participating preferred stock,
paired shares, warrants and rights are also excluded. Trust receipts, Royalty
Trusts, limited liability companies, OTC Bulletin Board companies, pink sheets,
closed-end mutual funds, and limited partnerships that are traded on U.S.
exchanges, are also ineligible for inclusion. Real Estate Investment Trusts and
Beneficial Trusts are eligible for inclusion, however. Generally, only one class
of securities of a company is allowed in the Russell 3000 Index, although
exceptions to this general rule have been made where Russell has determined that
each class of securities acts independent of the other.
 
     The primary criterion used to determine the initial list of securities
eligible for the Russell 3000 Index is total market capitalization, which is
defined as the price of the shares times the total number of shares outstanding.
Based on closing values on May 31 of each year, Russell reconstitutes the
composition of the Russell 3000 Index using the then existing market
capitalizations of eligible companies. As of June 30 of each year, the Index is
adjusted to reflect the reconstitution of the Russell 3000 Index for that year.
Publication of the Index began on January 1, 1987.
 
     THE INDEX DOES NOT REFLECT THE PAYMENT OF DIVIDENDS ON THE STOCKS
UNDERLYING IT AND THEREFORE THE RETURN BASED ON THE SUPPLEMENTAL REDEMPTION
AMOUNT WILL NOT PRODUCE THE SAME RETURN YOU WOULD RECEIVE IF YOU WERE TO
PURCHASE SUCH UNDERLYING STOCKS AND HOLD THEM FOR A PERIOD EQUAL TO THE MATURITY
OF THE NOTES.
 
COMPUTATION OF THE INDEX
 
     While Russell currently employs the following methodology to calculate the
Index, no assurance can be given that Russell will not modify or change such
methodology in a manner that may affect the Supplemental Redemption Amount, if
any, payable to beneficial owners of Notes upon maturity or otherwise.
 
     As a capitalization-weighted index, the Russell 2000 Index reflects changes
in the capitalization (market value) of the component stocks relative to the
capitalization on a base date. The current Index value is calculated by adding
the market values of the Index's component stocks, which are derived by
multiplying the price of each stock by the number of shares outstanding, to
arrive at the total market capitalization of the 2,000 stocks. The total market
capitalization is then divided by a divisor, which represents the "adjusted"
                                      S-17
<PAGE>   18
 
capitalization of the Index on the base date of December 31, 1986. To calculate
the Index, last sale prices will be used for exchange-traded and NASDAQ National
Market stocks. If a component stock is not open for trading, the most recently
traded price for that security will be used in calculating the Index. In order
to provide continuity for the Index's value, the divisor is adjusted
periodically to reflect such events as changes in the number of common shares
outstanding for component stocks, company additions or deletions, corporate
restructurings and other capitalization changes.
 
     All disclosure contained in this Prospectus Supplement regarding the Index,
or its publisher, is derived from publicly available information. All copyrights
and other intellectual property rights relating to the Index are owned by
Russell. Russell has no relationship with the Company or the Notes; it does not
sponsor, endorse, authorize, sell or promote the Notes, and has no obligation or
liability in connection with the administration, marketing or trading of the
Notes. None of the Company, the Calculation Agent, the Trustee under the Senior
Debt Indenture or the Underwriters accepts any responsibility for the
calculation, maintenance or publication of the Russell 2000 Index or any
Successor Index.
 
     Below is a breakdown of the component stocks of the Index by industry group
as of August 31, 1998:
 
<TABLE>
<CAPTION>
                                                              NUMBER OF    PERCENTAGE
                                                              COMPANIES      MARKET
                                                              ---------    ----------
<S>                                                           <C>          <C>
Technology..................................................      248        11.7%
Health Care.................................................      191         8.7%
Consumer Discretionary and Services.........................      390        17.6%
Consumer Staples............................................       51         3.1%
Integrated Oils.............................................        7         0.4%
Other Energy................................................       74         2.6%
Materials and Processing....................................      206         9.9%
Producer Durables...........................................      146         7.0%
Auto and Transportation.....................................       86         4.2%
Financial Services, including REITS.........................      454        25.9%
Utilities...................................................      105         7.9%
Other.......................................................       17         1.0%
          Total.............................................    1,975(1)      100%
</TABLE>
 
- ---------------
(1) The Index included fewer than 2,000 stocks (1,975) as of August 31, 1998 due
    to company attrition (e.g., mergers, bankruptcies, etc.).
 
Source: Russell.
 
                                      S-18
<PAGE>   19
 
HISTORICAL DATA ON THE INDEX
 
     The following table sets forth the value of the Index at the end of each
month in the period from January 1992 through August 1998. These historical data
on the Index are not necessarily indicative of the future performance of the
Index or what the value of the Notes may be. Any historical upward or downward
trend in the value of the Index during any period set forth below is not any
indication that the Index is more or less likely to increase or decrease at any
time during the term of the Notes.
 
<TABLE>
<CAPTION>
                        1992       1993       1994       1995       1996       1997       1998
                       -------    -------    -------    -------    -------    -------    -------
<S>                    <C>        <C>        <C>        <C>        <C>        <C>        <C>
January..............   205.17     228.10     266.52     246.85     315.38     369.45     430.05
February.............   211.15     222.41     265.53     256.57     324.93     360.05     461.83
March................   203.70     229.21     251.06     260.77     330.77     342.56     480.68
April................   196.26     222.68     252.55     266.17     348.28     343.00     482.89
May..................   198.52     232.19     249.28     270.25     361.85     380.76     456.62
June.................   188.58     233.35     240.29     283.63     346.62     396.37     457.39
July.................   194.74     236.46     244.06     299.72     316.00     414.48     419.75
August...............   188.79     246.19     257.32     305.31     333.88     423.43     337.95
September............   192.92     252.95     256.12     310.38     346.39     453.82
October..............   198.90     259.18     255.02     296.25     340.57     433.26
November.............   213.81     250.41     244.25     308.58     354.11     429.92
December.............   221.01     258.59     250.36     315.97     362.61     437.02
</TABLE>
 
     The following table sets forth the closing values of the Index on the last
business day of each year from 1978 through 1997, as published by Russell. All
historical data presented in the following table relating to periods prior to
January 1, 1987 (the date Russell commenced publication of the Index) are
presented as if the Index had existed during such periods and such closing
levels have been calculated hypothetically on the same basis that the Index is
calculated. All historical data presented in the following table relating to
periods after January 1, 1987 are based on actual data from the Index. The
historical experience of the Index should not be taken as an indication of
future performance and no assurance can be given that the value of the Index
will not decline and thereby reduce or eliminate the Supplemental Redemption
Amount which may be payable to holders of the Notes at the stated maturity date.
 
                      YEAR-END CLOSING VALUE OF THE INDEX
 
<TABLE>
<CAPTION>
         YEAR-END               YEAR-END               YEAR-END               YEAR-END
YEAR   CLOSING VALUE   YEAR   CLOSING VALUE   YEAR   CLOSING VALUE   YEAR   CLOSING VALUE
- ----   -------------   ----   -------------   ----   -------------   ----   -------------
<S>    <C>             <C>    <C>             <C>    <C>             <C>    <C>
1978       40.52       1983      112.27       1988      147.36       1993      258.59
1979       55.91       1984      101.49       1989      168.31       1994      250.36
1980       74.80       1985      129.87       1990      132.20       1995      315.97
1981       73.67       1986      135.00       1991      189.94       1996      362.61
1982       88.90       1987      120.42       1992      221.01       1997      437.02
</TABLE>
 
     The closing value of the Index on September 10, 1998 was 344.97.
 
                                      S-19
<PAGE>   20
 
HISTORICAL YEAR-END CLOSING VALUES
 
     The following graph illustrates the historical performance of the Index
based on the closing value thereof at the end of each year from 1978 through
1997 and as of September 10, 1998. Past movements of the Index are not
necessarily indicative of future Index values.
 
         RUSSELL 2000 INDEX HISTORICAL YEAR-END CLOSING VALUES [GRAPH]
 
<TABLE>
<CAPTION>
                     MEASUREMENT PERIOD
                   (FISCAL YEAR COVERED)                         YEAR-END CLOSING VALUES
<S>                                                           <C>
1978                                                                       40.52
                                                                           55.91
1980                                                                        74.8
                                                                           73.67
1982                                                                        88.9
                                                                          112.27
1984                                                                      101.49
                                                                          129.87
1986                                                                         135
                                                                          120.42
1988                                                                      147.36
                                                                          168.31
1990                                                                       132.2
                                                                          189.94
1992                                                                      221.01
                                                                          258.59
1994                                                                      250.36
                                                                          315.97
1996                                                                      362.61
                                                                          437.02
1998                                                                      344.97
</TABLE>
 
LICENSE AGREEMENT
 
     The Russell 2000 Index is a trademark of Russell and has been licensed for
use by the Company. The Notes are not sponsored, endorsed, sold or promoted by
Russell. Russell makes no representation or warranty, express or implied, to the
owners of the Notes or any member of the public regarding the advisability of
investing in securities generally or in the Notes particularly or the ability of
the Russell 2000 Index to track general stock market performance or a segment of
the same. Russell's publication of the Russell 2000 Index in no way suggests or
implies an opinion by Russell as to the advisability of investment in any or all
of the securities upon which the Russell 2000 Index is based. Russell's only
relationship to the Company is the licensing of certain trademarks and trade
names of Russell and of the Russell 2000 Index which is determined, composed and
calculated by Russell without regard to the Company or the Notes. Russell is not
responsible for and has not reviewed the Notes nor any associated literature or
publications and Russell makes no representation or warranty, express or
implied, as to their accuracy or completeness, or otherwise. Russell reserves
the right, at any time and without notice, to alter, amend, terminate or in any
way change the Russell 2000 Index. Russell has no obligation or liability in
connection with the administration, marketing or trading of the Notes.
 
     RUSSELL DOES NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE
RUSSELL 2000 INDEX OR ANY DATA INCLUDED THEREIN AND RUSSELL SHALL HAVE NO
LIABILITY FOR ANY ERRORS, OMISSIONS, OR INTERRUPTIONS THEREIN. RUSSELL MAKES NO
WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE COMPANY,
INVESTORS, OWNERS OF THE SECURITIES, OR ANY OTHER PERSON OR ENTITY FROM THE USE
OF THE RUSSELL 2000 INDEX OR ANY DATA INCLUDED THEREIN. RUSSELL MAKES NO EXPRESS
OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE RUSSELL 2000
INDEX OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO
EVENT SHALL RUSSELL HAVE ANY LIABILITY FOR ANY SPECIAL, PUNITIVE, INDIRECT, OR
CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS), EVEN IF NOTIFIED OF THE
POSSIBILITY OF SUCH DAMAGES.
 
                                      S-20
<PAGE>   21
 
     All disclosure contained in this Prospectus Supplement regarding the Index,
including its make-up, method of calculation and changes in its components are
derived from publicly available information prepared by Russell. None of the
Company, Salomon Smith Barney or the Trustee under the Senior Debt Indenture
assumes any responsibility for the accuracy or completeness of such information.
 
            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS
 
     The following is a general summary of certain United States federal income
tax considerations that may be relevant to a holder of a Note. This summary is
based on laws, regulations, rulings and decisions now in effect, all of which
are subject to change (possibly with retroactive effect) and to differing
interpretations. Furthermore, there can be no assurance that the Internal
Revenue Service would not take a position contrary to those expressed herein.
This summary deals only with holders that will hold Notes as capital assets, and
does not address all aspects of U.S. federal income taxation that may be
applicable to investors in light of their particular circumstances, or to
investors subject to special treatment under U.S. federal income tax law
(including, but not limited to, financial institutions, tax-exempt entities,
insurance companies or dealers in securities or currencies, persons having a
functional currency other than the U.S. dollar, persons holding the Notes as a
position in a "straddle" or conversion transaction, or as part of a "synthetic
security" or other integrated financial transaction). This summary also does not
address the state, local or foreign tax consequences of an investment in the
Notes. The discussion below is based on the advice of Cleary, Gottlieb, Steen &
Hamilton, counsel to Salomon Smith Barney and special tax counsel to the
Company.
 
     Investors should consult their own tax advisors in determining the tax
consequences to them of holding Notes, including the application to their
particular situation of the U.S. federal income tax considerations discussed
below.
 
     As used herein, the term "U.S. holder" means a person who is a citizen or
resident of the United States, or that is a corporation, partnership or other
entity created or organized in or under the laws of the United States or any
political subdivision thereof, an estate the income of which is subject to
United States federal income taxation regardless of its source or a trust if (i)
a U.S. court is able to exercise primary supervision over the trust's
administration and (ii) one or more U.S. persons have the authority to control
all of the trust's substantial decisions.
 
TAX CHARACTERIZATION OF THE NOTES
 
     Each Note will be treated by the Company for U.S. federal income tax
purposes as a single debt instrument issued by the Company that is subject to
U.S. Treasury regulations governing contingent debt instruments (the "Contingent
Debt Regulations"). Moreover, each holder, by accepting a Note, agrees to this
treatment of such Note and to report all income (or loss) with respect to the
Notes in accordance with the Contingent Debt Regulations. The remainder of this
summary assumes the treatment of the Note as a single debt instrument subject to
the Contingent Debt Regulations and the holder's agreement thereto.
 
U.S. HOLDERS
 
     Taxation of Interest.  A U.S. holder of a Note will recognize income (or
loss) on a Note in accordance with the Contingent Debt Regulations. The
Contingent Debt Regulations require the application of a "noncontingent bond
method" to determine accruals of income, gain, loss and deduction with respect
to a contingent debt obligation. As described in more detail in the second
succeeding paragraph, under the noncontingent bond method, a U.S. holder of a
Note will be required for tax purposes to include in income each year an accrual
of interest at the rate of      percent (the "comparable yield"). Solely for
purposes of determining the comparable yield pursuant to the Contingent Debt
Regulations, a holder of a Note will be assumed to be entitled to receive a
payment of $     on the maturity date (the "Assumed Supplemental Redemption
Amount") in respect of each Unit. The Assumed Supplemental Redemption Amount is
calculated as the amount required to produce the comparable yield of a Note,
taking into account the Note's issue price.
 
     The comparable yield and the Assumed Supplemental Redemption Amount are
used to determine accruals of interest FOR TAX PURPOSES ONLY and are not
assurances or predictions by the Company with respect to the actual yield of, or
payment to be made in respect of, a Note. The comparable yield and the
 
                                      S-21
<PAGE>   22
 
Assumed Supplemental Redemption Amount do not necessarily represent the
Company's expectations regarding such yield or the amount of such payment.
 
     Each Note will be issued at par. However, there will be Tax OID because Tax
OID must be accrued at the comparable yield. Under the Tax OID rules of the
Internal Revenue Code of 1986, as amended (the "Code"), and the Treasury
regulations promulgated thereunder, a U.S. holder of a Note, whether such holder
uses the cash or the accrual method of tax accounting, will be required to
include as ordinary interest income the sum of the "daily portions" of Tax OID
on the Note for all days during the taxable year that the U.S. holder owns the
Note. As a result, a U.S. holder of a Note that employs the cash method of tax
accounting will be required to include amounts in respect of Tax OID accruing on
a Note in taxable income each year, even though cash payment on the Note is only
at maturity.
 
     The daily portions of Tax OID on a Note are determined by allocating to
each day in any accrual period a ratable portion of the Tax OID allocable to
that accrual period. In the case of an initial holder, the amount of Tax OID on
a Note allocable to each accrual period is determined by multiplying the
"adjusted issue price" (as defined below) of a Note at the beginning of the
accrual period by the comparable yield of a Note (appropriately adjusted to
reflect the length of the accrual period). The "adjusted issue price" of a Note
at the beginning of any accrual period will generally be the sum of its issue
price and the amount of Tax OID allocable to all prior accrual periods.
 
     Disposition of the Notes.  When a U.S. holder sells, exchanges or otherwise
disposes of a Note (including the redemption of the Note at maturity) (a
"disposition"), the U.S. holder's gain (or loss) on such disposition will equal
the difference between the amount received by the U.S. holder for the Note and
the U.S. holder's tax basis in the Note. Upon a Note's maturity, if there is a
payment of a Supplemental Redemption Amount and such Supplemental Redemption
Amount exceeds the Assumed Supplemental Redemption Amount, the U.S. holder will
be required to include such excess in income as ordinary interest on the
maturity date. Alternatively, if there is a payment of a Supplemental Redemption
Amount and such Supplemental Redemption Amount is less than the Assumed
Supplemental Redemption Amount, the shortfall will be treated as an offset to
any interest otherwise includible in income by the U.S. holder with respect to
the Note for the taxable year in which the maturity date occurs but only to the
extent of the amount of such includible interest. Any remaining portion of such
shortfall may be recognized and deducted by the U.S. holder as an ordinary loss.
A U.S. holder's tax basis (i.e., adjusted cost) in a Note will be equal to the
U.S. holder's original purchase price for such Note, plus any Tax OID accrued by
the U.S. holder. Any gain realized by a U.S. holder on a disposition will be
treated as ordinary interest income. Any loss realized by a U.S. holder on a
disposition will be treated as ordinary loss, to the extent of the U.S. holder's
Tax OID inclusions with respect to the Note up to the date of disposition. Any
loss realized in excess of such amount generally will be treated as a capital
loss. An individual U.S. holder generally will be allowed a deduction for any
such ordinary loss without regard to the two-percent miscellaneous itemized
deduction rule of Section 67 of the Code. Any capital loss recognized by a U.S.
holder will be a long-term capital loss if such U.S. holder has held such Note
for more than one year, and a short-term capital loss in other cases.
 
     A U.S. holder that purchases a Note in the secondary market for an amount
that differs from the Note's adjusted issue price at the time of purchase will
be required to accrue Tax OID on the Note in accordance with the comparable
yield and Assumed Supplemental Redemption Amount, even if market conditions have
changed since the date of issuance. A U.S. holder must determine whether the
difference between the purchase price for a Note and the adjusted issue price of
the Note is attributable to a change in expectations as to the Supplemental
Redemption Amount, a change in interest rates, or both, and allocate the
difference accordingly. Adjustments allocated to a change in interest rates will
cause, as the case may be, a "positive adjustment" or a "negative adjustment" to
the U.S. holder's Tax OID inclusion. If the adjusted issue price is more than
the purchase price for the Note, a "positive adjustment" will result, and if the
adjusted issue price is less than the purchase price of the Note, a "negative
adjustment" will result. If the difference between a U.S. holder's purchase
price for a Note and the adjusted issue price of the Note is attributable to a
change in expectations as to the Supplemental Redemption Amount (and not to a
change in market interest rates), the U.S. holder will be required to allocate
that difference to the Supplemental Redemption Amount. Adjustments allocated to
the Supplemental Redemption Amount are taken into account at the time the
Supplemental Redemption Amount is paid. If the purchaser's tax basis in a Note
is greater than the adjusted issue price
                                      S-22
<PAGE>   23
 
of the Note, the excess is treated as a "negative adjustment" that reduces the
Supplemental Redemption Amount; if the purchaser's tax basis in a Note is less
than the adjusted issue price of the Note, the difference is treated as a
"positive adjustment" that increases the Supplemental Redemption Amount. Any
negative or positive adjustment of the kind described above made by a U.S.
holder of a Note will decrease or increase, respectively, the U.S. holder's tax
basis in the Note.
 
     Certain U.S. holders may receive Forms 1099-OID reporting Tax OID accruals
on a Note. Those forms may not, however, reflect the effects of any positive or
negative adjustments resulting from the U.S. holder's purchase of the Note in
the secondary market at a price that differs from its adjusted issue price on
the date of purchase. U.S. holders are urged to consult their tax advisors as to
whether, and how, such adjustments should be made to the amounts reported on any
Form 1099-OID.
 
     Information Reporting and Backup Withholding.  A noncorporate U.S. holder
may be subject to information reporting and to backup withholding at a rate of
31 percent with respect to payments of principal, premium and interest
(including Tax OID) made on a Note, or the proceeds of a disposition of a Note
before maturity, unless such U.S. holder provides proof of an applicable
exemption or a correct taxpayer identification number, and otherwise complies
with applicable requirements of the information reporting and backup withholding
rules.
 
NON-U.S. HOLDERS
 
     Taxation of Interest and Disposition of the Notes.  Under current U.S.
federal income tax law: (a) payment of a Supplemental Redemption Amount to a
holder who is not a U.S. holder (a "non-U.S. holder") will not be subject to
withholding of U.S. federal income tax, provided that (i) the holder does not
actually or constructively own 10 percent or more of the combined voting power
of all classes of stock of the Company and is not a controlled foreign
corporation related to the Company through stock ownership and (ii) the
beneficial owner provides a statement signed under penalties of perjury that
includes its name and address and certifies that it is a non-U.S. holder in
compliance with applicable requirements or, with respect to payments made after
December 31, 1999, satisfies certain documentary evidence requirements for
establishing that it is a non-U.S. holder; and (b) a non-U.S. holder will not be
subject to U.S. federal income tax on gain realized on the disposition of a
Note. Notwithstanding the above, a non-U.S. holder that is subject to U.S.
federal income taxation on a net income basis with respect to its income from a
Note generally will be subject to the same rules to which a U.S. holder is
subject with respect to the accrual of interest (including Tax OID) on a Note
and with respect to gain or loss realized or recognized on the disposition of a
Note. Special rules might also apply to a non-U.S. holder that is a qualified
resident of a country with which the U.S. has an income tax treaty.
 
     Information Reporting and Backup Withholding.  U.S. information reporting
requirements and backup withholding tax will not apply to payments on, or
proceeds from the disposition of, a Note if the beneficial owner certifies its
non-U.S. status under penalties of perjury (or, with respect to payments made
after December 31, 1999, satisfies certain documentary evidence requirements for
establishing that it is a non-U.S. holder) or otherwise establishes an
exemption.
 
     The U.S. Treasury Department issued final Treasury regulations governing
information reporting and the certification procedures regarding withholding and
backup withholding on certain amounts paid to non-U.S. persons after December
31, 1999. Such regulations, among other things, may change the certification
procedures relating to the receipt by intermediaries of payments on behalf of a
beneficial owner of a Note. Prospective investors should consult their tax
advisors regarding the effect, if any, of such Treasury regulations on an
investment in the Notes.
 
     With respect to payments made after December 31, 1999, for purposes of
applying the rules set forth in the three preceding paragraphs to an entity that
is treated as fiscally transparent (e.g., a partnership or certain trusts) for
U.S. federal income tax purposes, the beneficial owner means each of the
ultimate beneficial owners of the entity.
 
                                      S-23
<PAGE>   24
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in an underwriting agreement
(the "Underwriting Agreement") between the Company and Salomon Smith Barney, as
sole underwriter (the "Underwriter"), the Company has agreed to sell to the
Underwriter, and the Underwriter has agreed to purchase from the Company, $
principal amount of Notes.
 
     The Notes are offered subject to receipt and acceptance by the Underwriter,
to prior sale and to the Underwriter's right to reject any order in whole or in
part and to withdraw, cancel or modify the offer without notice. It is expected
that delivery of the Notes will be made at the office of Salomon Smith Barney,
388 Greenwich Street, New York, New York, or through the facilities of the
Depositary, on or about      , 1998.
 
     The Company has been advised that the Underwriter proposes to offer the
Notes to the public initially at the public offering price set forth on the
cover page of this Prospectus Supplement and to certain dealers at a price that
represents a concession not in excess of $     per Unit, and that the
Underwriter may allow, and each such dealer may reallow, to other dealers a
concession not exceeding $     per Unit. After the initial public offering, the
public offering price, the underwriting discount and such concessions may be
changed from time to time.
 
     The Company has been advised by the Underwriter that the Underwriter may
make a market in the Notes, subject to applicable laws and regulations. However,
the Underwriter is not obligated to do so and may discontinue any such
market-making at any time without notice. No assurance can be given that an
active public market for the Notes will develop.
 
     The Underwriting Agreement provides that the Company will indemnify the
Underwriter against certain liabilities, including liabilities under the
Securities Act of 1933, as amended, or contribute to payments the Underwriter
may be required to make in respect thereof.
 
     The Notes may be offered to investors outside the United States. The
Underwriter has further agreed that any offers and sales made outside the United
States will be made in compliance with any selling restrictions applicable in
the jurisdictions where such offers and sales are made.
 
     Salomon Smith Barney is an indirect wholly-owned subsidiary of the Company.
Accordingly, the offering is being made pursuant to the provisions of Rule 2720
of the Conduct Rules of the National Association of Securities Dealers, Inc.
regarding the offering by an affiliate of the securities of its parent.
 
     In connection with this offering, the Underwriter and selling group members
and their respective affiliates may engage in transactions that stabilize,
maintain or otherwise affect the market price of the Notes. Such transactions
may include stabilization transactions effected in accordance with Rule 104 of
Regulation M under the Exchange Act, pursuant to which such persons may bid for
or purchase Notes for the purposes of stabilizing their market price. The
Underwriter also may create a short position for its accounts by selling more
Notes in connection with this offering than it is committed to purchase from the
Company, and in such case may purchase Notes in the open market following
completion of this offering to cover all or a portion of such short position.
Any of the transactions described in this paragraph may result in the
maintenance of the price of the Notes at a level above that which might
otherwise prevail in the open market. None of the transactions described in this
paragraph is required, and, if any are undertaken, they may be discontinued at
any time.
 
     The Company or one or more its subsidiaries may from time to time purchase
or acquire a position in the Notes and may, at its option, hold, resell or
retire such Notes. This Prospectus Supplement and the Prospectus may be used by
Salomon Smith Barney and/or any affiliate thereof in connection with offers and
sales of the Notes in market-making transactions at negotiated prices related to
prevailing market prices at the time of sale. Any such affiliate may act as
principal or agent in such transactions.
 
                                      S-24
<PAGE>   25
 
                                 ERISA MATTERS
 
     No employee benefit plan subject to the fiduciary responsibility provisions
of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"), or
any entity with respect to which part or all of its assets constitute assets of
any such Plan, or any government or other plan subject to Federal, state or
local law substantially similar to the fiduciary responsibility provisions of
ERISA ("ERISA Plan") is permitted to purchase, hold or otherwise acquire the
Notes. Any plan that is subject to Section 4975(e)(1) of the Code that is not an
ERISA Plan (for example, individual retirement accounts, individual retirement
annuities or Keogh Plans) may only purchase the Notes if such plan has
determined that the purchase, holding and disposition of such Notes and the
transactions contemplated hereby would not constitute a prohibited transaction
under Section 4975 of the Code for which no exemption is available.
 
                                 LEGAL MATTERS
 
     Certain legal matters relating to the Notes will be passed upon for the
Company by Robert H. Mundheim, Esq., as counsel for the Company. Mr. Mundheim,
General Counsel of the Company, beneficially owns, or has rights to acquire
under Travelers Group employee benefit plans, an aggregate of less than one
percent of the common stock of Travelers Group. Certain legal matters relating
to the Notes will be passed upon for the Underwriter by Cleary, Gottlieb, Steen
& Hamilton.
 
     Cleary, Gottlieb, Steen & Hamilton has also acted as special tax counsel to
the Company in connection with the Notes and has, from time to time, acted as
counsel for the Company and certain of its affiliates and may do so in the
future.
 
                                      S-25
<PAGE>   26
 
                                                                      APPENDIX A
                                 INDEX OF TERMS
 
<TABLE>
<CAPTION>
                                                                   PAGE
                                                                   ----
<S>                                                           <C>
Adjusted Ending Value.......................................  S-3, S-12
adjusted issue price........................................  S-22
Adjustment Factor...........................................  S-3, S-12
AMEX........................................................  S-4
Assumed Supplemental Redemption Amount......................  S-21
Calculation Agent...........................................  S-5
Calculation Day.............................................  S-12
Calculation Period..........................................  S-3, S-12
CBOE........................................................  S-5
CME.........................................................  S-12
Code........................................................  S-22
Company.....................................................  S-2
comparable yield............................................  S-21
Contingent Debt Regulations.................................  S-21
Depositary..................................................  S-2
Direct Participants.........................................  S-16
disposition.................................................  S-22
ERISA.......................................................  S-25
ERISA Plan..................................................  S-25
Exchange Act................................................  S-6
Global Notes................................................  S-16
Index.......................................................  S-2
Index Business Day..........................................  S-12
Market Disruption Event.....................................  S-14
non-U.S. holder.............................................  S-23
Notes.......................................................  S-2, S-11
NYSE........................................................  S-4
Participants................................................  S-16
Pricing Date................................................  S-3
Russell.....................................................  Cover page, S-2
Russell 2000 Index..........................................  S-2
Salomon Smith Barney........................................  S-5
SEC.........................................................  S-5
Starting Value..............................................  S-3, S-12
Successor Index.............................................  S-15
Supplemental Redemption Amount..............................  S-2
Tax OID.....................................................  S-10
Travelers Group.............................................  S-5
Trustee.....................................................  S-11
Underwriter.................................................  S-24
Underwriting Agreement......................................  S-24
Unit........................................................  S-2
U.S. holder.................................................  S-21
</TABLE>
 
                                       A-1
<PAGE>   27
 
- ------------------------------------------------------
- ------------------------------------------------------
 
  YOU SHOULD RELY ONLY ON THE INFORMATION INCORPORATED BY REFERENCE OR PROVIDED
IN THIS PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS. WE HAVE NOT
AUTHORIZED ANYONE TO PROVIDE YOU WITH DIFFERENT INFORMATION. WE ARE NOT MAKING
AN OFFER OF THESE SECURITIES IN ANY STATE WHERE THE OFFER IS NOT PERMITTED. YOU
SHOULD NOT ASSUME THAT THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT IS ACCURATE
AS OF ANY DATE OTHER THAN THE DATE ON THE FRONT OF THE DOCUMENT.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
           PROSPECTUS SUPPLEMENT
Summary Information -- Q&A............   S-2
Incorporation of Certain Documents by
  Reference...........................   S-6
Risk Factors Relating to the Notes....   S-7
Description of the Notes..............  S-11
The Russell 2000 Index................  S-17
Certain United States Federal Income
  Tax Considerations..................  S-21
Underwriting..........................  S-24
ERISA Matters.........................  S-25
Legal Matters.........................  S-25
Index of Terms........................   A-1
 
                 PROSPECTUS
Prospectus Summary....................     2
The Company...........................     6
Ratio of Earnings to Fixed Charges....     6
The Offered Securities................     6
Description of Debt Securities........     7
Description of Index Warrants.........    15
Limitations on Issuance of Bearer
  Securities and Bearer Warrants......    19
European Monetary Union...............    20
Use of Proceeds and Hedging...........    21
Plan of Distribution..................    21
ERISA Matters.........................    23
Experts...............................    24
Legal Matters.........................    24
Available Information.................    25
Incorporation of Certain Documents by
  Reference...........................    25
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
 
                                           UNITS
 
                                 SALOMON SMITH
                              BARNEY HOLDINGS INC.
 
                             WORLD INDEX ALLOCATION
                                  SERIES 1998
 
                    PRINCIPAL-PROTECTED EQUITY LINKED NOTES
                                 BASED UPON THE
                             RUSSELL 2000(R) INDEX
                                DUE       , 2005
                        ($10 PRINCIPAL AMOUNT PER UNIT)
                                  ------------
                             PROSPECTUS  SUPPLEMENT
                                       , 1998
                             (INCLUDING PROSPECTUS
                            DATED DECEMBER 1, 1997)
 
                                  ------------
                              SALOMON SMITH BARNEY
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- ------------------------------------------------------


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