USX CORP
S-3/A, 1994-01-05
STEEL WORKS, BLAST FURNACES & ROLLING MILLS (COKE OVENS)
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<PAGE>
 
     
  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 5, 1993     
                                                    
                                                 REGISTRATION NO. 033-51621     
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
 
                                ----------------
                             
                                AMENDMENT NO. 1
                                      TO
                                   FORM S-3
                              
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
 
                                ----------------
 
 
                                USX CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
           DELAWARE                                25-0996816
       (STATE OR OTHER                          (I.R.S. EMPLOYER
       JURISDICTION OF                        IDENTIFICATION NO.)
       INCORPORATION OR
        ORGANIZATION)
 
         600 GRANT STREET PITTSBURGH, PENNSYLVANIA 15230 (412) 433-1121
 
 
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
 
                                DAN D. SANDMAN
                         GENERAL COUNSEL AND SECRETARY
                               600 GRANT STREET
                        PITTSBURGH, PENNSYLVANIA 15230
                                (412) 433-1121
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                  INCLUDING AREA CODE, OF AGENT FOR SERVICE)
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                                USX CORPORATION
 
                                DEBT SECURITIES
                                PREFERRED STOCK
                        USX-MARATHON GROUP COMMON STOCK
                       USX-U.S. STEEL GROUP COMMON STOCK
                          USX-DELHI GROUP COMMON STOCK
 
                                ----------------
 
  USX Corporation ("USX") proposes to issue and offer from time to time (1)
unsecured debt securities of USX (the "Debt Securities"); (2) USX Corporation
Preferred Stock ("Preferred Stock"); (3) USX-Marathon Group Common Stock of USX
Corporation ("Marathon Stock"); (4) USX-U.S. Steel Group Common Stock of USX
Corporation ("Steel Stock"); (5) USX-Delhi Group Common Stock of USX
Corporation ("Delhi Stock") or any combination of the foregoing at an aggregate
public offering price of $850,000,000 (or the equivalent thereof in foreign
denominated currency (or units based on or related thereto) in the case of Debt
Securities), at prices and on terms to be determined at or prior to the time or
times of sale.
 
  Specific terms of the securities in respect to which this Prospectus is being
delivered ("Offered Securities") shall be set forth in an accompanying
Prospectus Supplement, together with the terms of the offering of the Offered
Securities, the initial price thereof and net proceeds from the sale thereof.
All such Prospectus Supplement(s) shall also set forth with regard to the
particular Offered Securities, without limitation, the following: (1) in the
case of Debt Securities, the designation of each separate series and the
aggregate principal amount, maturity, interest rate, if any, whether fixed or
variable (or the manner of calculation thereof), redemption and sinking fund
provisions or other repayment obligations, currency in which denominated,
amounts determined by reference to an index, purchase price and any listing on
a securities exchange, (2) in the case of Marathon Stock, Steel Stock or Delhi
Stock, the number of shares offered, the number of shares to be outstanding
after the offering, the price range and dividend history of the relevant stock
and any listing on a securities exchange, and (3) in the case of Preferred
Stock, the designation, number of shares offered, liquidation preference per
share, dividend rate, dates on which dividends are to be payable and dates from
which dividends accrue, any redemption or sinking fund provisions, any
conversion features, and any listing on a securities exchange.
 
  USX may sell the Offered Securities to or through underwriters or directly to
other purchasers or through agents or through and to brokers or dealers acting
as underwriters who will be named in the accompanying Prospectus Supplement(s)
along with terms of the public offering, including the offering price, the
principal amounts, if any, to be purchased by underwriters, the commission or
discount to the underwriters and the amount of other expenses attributable to
the issuance and distribution of the Debt Securities.
 
                                ----------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
    SECURITIES AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES  COMMISSION
     PASSED  UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS  PROSPECTUS.  ANY
      REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                                ----------------
                 
              THE DATE OF THIS PROSPECTUS IS JANUARY 6, 1994.     
<PAGE>
 
                             AVAILABLE INFORMATION
 
  USX Corporation ("USX") is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, files reports, proxy statements and other information
with the Securities and Exchange Commission (the "Commission"). Such reports,
proxy statements and other information filed by USX can be inspected and copied
at prescribed rates at the Public Reference Room of the Commission at Judiciary
Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the public
reference facilities maintained by the Commission at 75 Park Place, New York,
New York 10007, and Northwestern Atrium Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661. Documents filed by USX can also be inspected at
the offices of the New York Stock Exchange, Inc. (the "NYSE"), The Chicago
Stock Exchange and the Pacific Stock Exchange.
 
  USX has filed a Registration Statement on Form S-3 (the "Registration
Statement") with the Commission pursuant to the Securities Act of 1933, as
amended (the "Securities Act"), with respect to the Offered Securities. This
Prospectus does not contain all the information set forth in the Registration
Statement and the exhibits thereto, to which reference is hereby made.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents heretofore filed by USX with the Commission (file no.
1-5153) are incorporated herein by reference:
 
    (a) Annual Report on Form 10-K for the year ended December 31, 1992.
 
    (b) Quarterly Reports on Form 10-Q for the periods ended March 31, 1993,
    June 30, 1993 and September 30, 1993.
 
    (c) Current Reports on Form 8-K dated January 26, and February 11,
    February 24, May 27, June 11, June 29, and July 27, 1993.
 
    (d) The description of the Marathon Stock included in USX's Form 8
    Amendment to a Registration Statement on Form 8-A filed on April 11,
    1991.
 
    (e) The description of Steel Stock included in USX's Form 8-A
    Registration Statement filed on April 11, 1991.
 
    (f) The description of the Delhi Stock included in USX's Form 8-A
    Registration Statement filed on August 11, 1992.
 
  All reports and other documents filed by USX pursuant to Section 13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this
Prospectus and prior to the termination of the offering of the Debt Securities
shall be deemed to be incorporated by reference herein. Any statement contained
in a document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document which also is incorporated or deemed to be incorporated by reference
herein modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
  USX undertakes to provide without charge to each person to whom a Prospectus
is delivered, on the written or oral request of such person, a copy of any or
all of the information incorporated by reference in this Prospectus, other than
exhibits to such information (unless such exhibits are specifically
incorporated by reference into the information that this Prospectus
incorporates). Requests for such copies should be directed to the Office of the
Corporate Secretary, USX Corporation, 600 Grant Street, Pittsburgh,
Pennsylvania 15219-4776 (telephone: 412-433-2885).
 
                                       2
<PAGE>
 
                                USX CORPORATION
 
  USX is a diversified company which is principally engaged in the energy
business through its Marathon Group, in the steel business through its U.S.
Steel Group and in the gas gathering and processing business through its Delhi
Group.
 
  USX has three classes of common stock, USX--Marathon Group Common Stock
("Marathon Stock"), USX--U.S. Steel Group Common Stock ("Steel Stock") and
USX--Delhi Group Common Stock ("Delhi Stock"). The Marathon Stock, the Steel
Stock and the Delhi Stock are together referred to as "Common Stock." Each
class of common stock is intended to provide the stockholders of such class
with a separate security reflecting the performance of the related group.
Holders of Marathon Stock, Steel Stock and Delhi Stock are holders of common
stock of USX and continue to be subject to all of the risks associated with an
investment in USX and all of its businesses and liabilities.
 
  The Marathon Group includes the operations of Marathon Oil Company, a wholly
owned subsidiary of USX, which is engaged in worldwide exploration, production
and transportation of crude oil and natural gas, and domestic refining,
marketing and transportation of crude oil and petroleum products. Marathon
Group sales (excluding sales from the businesses included in the Delhi Group)
as a percentage of total USX consolidated sales were 67% in the first nine
months of 1993 and 69%, 72% and 69% in the years 1992, 1991 and 1990,
respectively.
 
  The U.S. Steel Group includes U.S. Steel, one of the largest integrated steel
producers in the United States, which is primarily engaged in the production
and sale of a wide range of steel mill products, coke and taconite pellets. The
U.S. Steel Group also includes the management of mineral resources, domestic
coal mining and engineering and consulting services and technology licensing.
Other businesses that are part of the U.S. Steel Group include real estate
development and management, fencing products, leasing and financing activities
and a majority interest in a titanium metal products company. U.S. Steel Group
sales as a percentage of total USX consolidated sales were 30% in the first
nine months of 1993 and 28%, 26% and 29% in the years 1992, 1991 and 1990,
respectively.
 
  The Delhi Group consists of Delhi Gas Pipeline Corporation and certain
related companies which are engaged in the purchasing, gathering, processing,
transporting and marketing of natural gas. Prior to October 2, 1992, the
businesses which are now included in the Delhi Group were included in the
Marathon Group and data regarding the Delhi Group for periods prior to that
date reflect the combined historical financial data of the businesses
comprising the Delhi Group. Delhi Group sales as a percentage of total USX
consolidated sales were 3% in the first nine months of 1993, 3% in the year
1992 and 2% in each of the years 1991 and 1990.
 
  USX was incorporated in 1901 and is a Delaware corporation. Its executive
offices are located at 600 Grant St., Pittsburgh, PA 15219-4776 (tel: (412)
433-1121). The term "USX" and the "Corporation" when used herein refer to USX
Corporation or USX Corporation and its subsidiaries, as required by the
context.
 
                      RATIO OF EARNINGS TO FIXED CHARGES
                       AND RATIO OF EARNINGS TO COMBINED
                  FIXED CHARGES AND PREFERRED STOCK DIVIDENDS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                     NINE MONTHS ENDED
                                       SEPTEMBER 30     YEAR ENDED DECEMBER 31
                                     ----------------- ------------------------
                                           1993        1992 1991 1990 1989 1988
                                           ----        ---- ---- ---- ---- ----
<S>                                  <C>               <C>  <C>  <C>  <C>  <C>
Ratio of earnings to fixed charges..        (a)        (a)  (a)  2.80 2.57 2.04
                                            ===        ===  ===  ==== ==== ====
Ratio of earnings to combined fixed
 charges and preferred stock divi-
 dends..............................        (b)        (b)  (b)  2.69 2.33 1.83
                                            ===        ===  ===  ==== ==== ====
</TABLE>
- --------
(a) Earnings did not cover fixed charges by $340 million for the first nine
    months of 1993, by $197 million for 1992 and by $681 million for 1991.
 
(b) Earnings did not cover combined fixed charges and preferred stock dividends
    by $372 million for the first nine months of 1993, by $211 million for 1992
    and by $696 million for 1991.
 
                                       3
<PAGE>
 
                                USE OF PROCEEDS
 
  USX intends to use the net proceeds from the sale of the Offered Securities
for general corporate purposes, the refunding of outstanding long-term
indebtedness and other financial obligations, interest rate management and
leveling of its debt maturity schedule.
 
                             SPECIAL CONSIDERATIONS
 
CONSIDERATIONS RELATING TO COMMON STOCK
 
 Stockholders of One Company; Financial Impacts from One Group Could Affect
 the other Groups
 
  Although the financial statements of the Marathon Group, the U.S. Steel Group
and the Delhi Group separately report the assets, liabilities (including
contingent liabilities) and stockholders' equity of USX attributed to each such
Group, such attribution of assets, liabilities (including contingent
liabilities) and stockholders' equity among the Marathon Group, the U.S. Steel
Group and the Delhi Group for the purpose of preparing their respective
financial statements does not affect legal title to such assets or
responsibility for such liabilities. Holders of Marathon Stock, Steel Stock and
Delhi Stock are holders of common stock of USX, and continue to be subject to
all of the risks associated with an investment in USX and all of its businesses
and liabilities. Financial impacts arising from one Group that affect the
overall cost of USX's capital could affect the results of operations and
financial condition of the other Groups. In addition, net losses of any Group,
as well as dividends and distributions on any class of USX common stock or
series of Preferred Stock and repurchases of any class of USX common stock or
series of Preferred Stock, will reduce the funds of USX legally available for
payment of dividends on the Common Stock of all the Groups. Accordingly, the
USX consolidated financial information should be read in connection with the
Group financial information. USX prepares and provides consolidated financial
statements, as well as financial statements of each Group, to the holders of
the respective classes of Common Stock. See "Management and Accounting
Policies."
 
 No Rights or Additional Duties With Respect to the Groups; Potential
 Conflicts
 
  Holders of Marathon Stock, Steel Stock and Delhi Stock have only the rights
of stockholders of USX, and, except as described under "Description of Capital
Stock--Marathon Stock--Exchange and Redemption" and "--Voting," under
"Description of Capital Stock--Steel Stock--Exchange and Redemption" and "--
Voting" and under "Description of Capital Stock--Delhi Stock--Exchange and
Redemption" and "--Voting," holders of Common Stock are not provided any rights
specifically related to any Group. In addition, principles of Delaware law
established in cases involving differing treatment of classes of capital stock
or groups of holders of the same class of capital stock provide that a board of
directors owes an equal duty to all stockholders regardless of class or series
and does not have separate or additional duties to any group of stockholders.
 
  The existence of separate classes of Common Stock may give rise to occasions
when the interests of holders of Marathon Stock, Steel Stock and Delhi Stock
may diverge or appear to diverge. Examples include the optional exchange of the
Delhi Stock for Marathon Stock or Steel Stock at the 10% premium or 15%
premium, as the case may be, the determination of the record date of any such
exchange or for the redemption of any Steel Stock or Delhi Stock, the
establishing of the date for public announcement of the liquidation of USX; and
the commitment of capital among the Marathon Group, the U.S. Steel Group and
the Delhi Group. Although USX is not aware of any precedent involving the
fiduciary duties of directors of corporations having classes of common stock or
separate classes or series of capital stock the rights of which are defined by
reference to specified operations of the corporation, under the principles of
Delaware law referred to above and the "business judgment rule," absent abuse
of discretion, a good faith determination made by a disinterested and
adequately informed Board with respect to any matter having disparate impacts
upon holders of Marathon Stock, Steel Stock or Delhi Stock would be a defense
to any challenge to such determination made by or on behalf of the holders of
any class of Common Stock.
 
                                       4
<PAGE>
 
  Because the Board owes an equal duty to all stockholders regardless of class,
the Board is the appropriate body to deal with these matters. In order to
assist the Board in this regard, USX has formulated policies to serve as
guidelines for the resolution of matters involving a conflict or a potential
conflict, including policies dealing with the payment of dividends, limiting
capital investment in the Steel Group over the long term to its internally
generated cash flow, the use of capital generated by the Delhi Group for the
expansion of its business, and allocation of corporate expenses and other
matters. See "Management and Accounting Policies." The Board has been advised
concerning the applicable law relating to the discharge of its fiduciary duties
to the common stockholders in the context of the separate classes of Common
Stock and has delegated to the Audit Committee of the Board the responsibility
to review matters which relate to this subject and report to the Board.
 
 Limited Separate Voting Rights
 
  Holders of shares of Marathon Stock, Steel Stock and Delhi Stock vote
together as a single class on all matters as to which all USX common
stockholders are entitled to vote. Holders of Marathon Stock, Steel Stock or
Delhi Stock will have no rights to vote on matters as a separate Group except
as described under "Description of Capital Stock--Marathon Stock--Voting,"
under "Description of Capital Stock--Steel Stock--Voting" and under
"Description of Capital Stock--Delhi Stock--Voting" and in certain limited
circumstances as currently provided under Delaware law. Separate meetings for
the holders of each class of Common Stock will not be held. Accordingly,
subject to such exceptions, holders of shares of Marathon Stock, Steel Stock or
Delhi Stock, cannot bring a proposal to a vote of the holders of Marathon
Stock, Steel Stock or Delhi Stock only, but are required to bring any proposal
to a vote of all holders of capital stock of USX entitled to vote generally
voting together as a single class.
 
  The interests of the holders of the Marathon Stock, Steel Stock and Delhi
Stock may diverge or appear to diverge with respect to certain matters as to
which such holders are entitled to vote. If, when a stockholder vote is taken
on any matter as to which a separate vote by any class would not be required
under the Certificate of Incorporation or Delaware law, the holders of one or
more classes of Common Stock would have more than the number of votes required
to approve any such matter, the holders of that class or classes would be in a
position to control the outcome of the vote on such matter. The Certificate of
Incorporation provides that neither the increase nor the decrease of the
authorized number of shares of any class of Common Stock requires a separate
vote of any such class. Thus, it is possible that the holders of a majority of
any class or two classes of Common Stock could constitute a majority of the
voting power of all classes of Common Stock and approve the increase or
decrease of the authorized amount of another class or classes of Common Stock
without the approval of the holders of such other class or classes of Common
Stock.
 
  On all matters where the holders of Common Stock vote together as a single
class, a share of Marathon Stock will have one vote and each share of Steel
Stock and Delhi Stock will have a fluctuating vote per share based on relative
time-weighted average ratios of their Market Values. Assuming that the time
weighted averages of the Market Values of Marathon Stock, Steel Stock and Delhi
Stock were $17, $39 and $16, respectively, the per share voting rights of
Marathon Stock, Steel Stock and Delhi Stock would be one vote, 2.29 votes and
.94 vote per share, respectively. If the Marathon Stock, the Steel Stock and
the Delhi Stock had such per share voting rights as of December 9, 1993, the
holders of Marathon Stock, Steel Stock and Delhi Stock would have approximately
62%, 35% and 3% respectively, of the total voting power of USX.
 
 Management and Accounting Policies Subject to Change
 
  Since 1991 USX has applied certain management and accounting policies adopted
by the Board and described herein, which policies may be modified or rescinded
in the sole discretion of the Board without approval of stockholders, although
the Board has no present intention to do so. See "Management and Accounting
Policies." The Board may also adopt additional policies depending upon the
circumstances. Any determination of the Board to modify or rescind such
policies, or to adopt additional policies, including any such decision that
would have disparate impacts upon holders of Marathon Stock, or Steel Stock or
Delhi Stock, would be made by the Board in good faith and in the honest belief
that such decision is in the best interests of all stockholders of USX. In
addition, generally accepted accounting principles require that any change in
accounting policy be preferable (in accordance with such principles) to the
policy previously established.
 
                                       5
<PAGE>
 
 Limitations on Potential Unsolicited Acquisitions
 
  If the Marathon Group, the Steel Group and the Delhi Group were separate
companies, any person interested in acquiring one of them without negotiation
with management could seek to obtain control of it by means of a tender offer
or proxy contest. Because each Group is not a separate company, any person
interested in acquiring only one Group without negotiation with USX management
would be required to seek control of the voting power representing all of the
outstanding capital stock of USX entitled to vote on such acquisition. See
"Limited Separate Voting Rights" above.
 
  Because of fluctuations in the relative Market Values of shares of the three
classes of Common Stock, the voting power of a particular stockholder may be
increased or decreased from that held at the time the stockholder acquired the
stock or from that held at the time of the previous vote. The fluctuating
voting powers of the three classes of Common Stock may influence a purchaser
interested in acquiring and maintaining control of USX to acquire equivalent
holdings in all classes of Common Stock.
 
 Dividends and Earnings Per Share
 
  The Board intends to declare and pay dividends on the Marathon Stock, Steel
Stock and Delhi Stock based on the financial condition and results of
operations of the respective Group, although it has no obligation under
Delaware law to do so. Subject to any prior rights of the holders of Preferred
Stock: (a) Marathon Stock will be payable out of legally available funds of USX
(as defined under Delaware law); (b) dividends on Steel Stock will be payable
out of the lesser of (i) the Available Steel Dividend Amount and (ii) legally
available funds; and (c) dividends on Delhi Stock will be payable when, as and
if declared by the Board out of the lesser of (i) the Available Delhi Dividend
Amount and (ii) legally available funds. In making its dividend decisions, the
Board will rely on the financial statements of each Group. In determining its
dividend policy, the Board will consider, among other things, the long-term
earnings and cash flow capabilities of each Group, as well as the dividend
policies of similar publicly traded companies.
 
  The method of calculating earnings per share for the Marathon Stock, the
Steel Stock and the Delhi Stock reflects the Board's intent that the separately
reported earnings and surplus of the Marathon Group, the Steel Group and the
Delhi Group as determined consistent with the Certificate of Incorporation, are
available for payment of dividends to the respective classes of stock, although
legally available funds and liquidation preferences of these classes of stock
do not necessarily correspond with these amounts. Dividends on all classes of
Preferred Stock and USX common stock are limited to legally available funds of
USX, which are determined on the basis of the entire Corporation. Distribution
on the Marathon Stock, the Steel Stock and the Delhi Stock would be precluded
by a failure to pay dividends on any series of Preferred Stock. Net losses of
any group as well as dividends and distributions on any class of common stock
or series of Preferred Stock and repurchases of any class of common stock or
series of Preferred Stock, will reduce the funds of USX legally available for
payment of dividends on all classes of common stock.
 
  Under Delaware law, a corporation may declare and pay dividends on its
capital stock either (1) out of its surplus or (2) in case there is no surplus,
out of its net profits for the year in which the dividend is declared and/or
the proceeding fiscal year. "Surplus" is the amount by which the total assets
of the corporation exceed total liabilities and capital. Capital for USX is the
sum of (a) the aggregate par value of the outstanding shares of Common Stock
(equal to $1 per share), (b) the aggregate stated capital of the outstanding
shares of Adjustable Rate Preferred Stock ($50 per share) and (c) the aggregate
stated capital of the outstanding shares of 6.50% Convertible Preferred Stock
($1 per share). If the capital of a corporation is diminished by depreciation
in the value of its properties, or by losses, or otherwise, to an amount less
than the aggregate amount of capital represented by the outstanding stock of
all classes having a preference upon the distribution of assets, dividends may
not be paid out of net profits (that is pursuant to clause (2) above) until the
deficiency in capital shall have been repaired. For purposes of determining
surplus, the assets and liabilities of a corporation are to be valued on the
basis of market value.
 
                                       6
<PAGE>
 
 Potential Effects of Exchange and Redemption of Common Stock
 
  Under various conditions, the Steel Stock may be exchanged, at USX's option,
for shares of Marathon Stock, or if there are no shares of Marathon Stock
outstanding, Delhi Stock at a 10% premium. Any exchange of Steel Stock for
Marathon Stock or Delhi Stock would preclude holders of Steel Stock from
retaining their investment in a security reflecting USX's steel and other
businesses that constitute the U.S. Steel Group. Any exchange of Delhi Stock
for Steel Stock would dilute the interests of holders of Steel Stock. See
"Description of Capital Stock--Steel Stock--Exchange and Redemption."
 
  Under various conditions, the Delhi Stock may be exchanged, at USX's option,
for shares of Marathon Stock, or if there are no shares of Marathon Stock
outstanding, Steel Stock at a 10% premium. In addition, the Board may at any
time exchange each outstanding share of Delhi Stock for a number of shares of
Marathon Stock or, if there are no shares of Marathon Stock outstanding and
shares of Steel Stock are outstanding, of Steel Stock at a 15% premium. USX
cannot predict the impact on the market price of the Delhi Stock of its ability
to effect any such exchange. In addition, any exchange of Delhi Stock for
Marathon Stock or Steel Stock would preclude holders of Delhi Stock from
retaining their investment in a security reflecting USX's natural gas
purchasing, gathering, processing, transporting and marketing operations, and
any exchange of Steel Stock for Delhi Stock would dilute the interests of
holders of Delhi Stock. See "Description of Capital Stock--Delhi Stock--
Exchange and Redemption."
 
                       MANAGEMENT AND ACCOUNTING POLICIES
 
MANAGEMENT POLICIES
 
  The Board has adopted certain policies with respect to the Marathon Group,
the U.S. Steel Group and the Delhi Group including, without limitation, the
intention to: (i) limit capital expenditures of the U.S. Steel Group over the
long term to an amount equal to the internally generated cash flow of the U.S.
Steel Group, including funds generated by sales of assets of the U.S. Steel
Group, (ii) sell assets and provide services among the groups only on an arm's-
length basis and (iii) treat funds generated by sale of Marathon Stock, Steel
Stock and Delhi Stock (except for the sale of shares deemed to represent the
Retained Interest) and securities convertible into such stock as assets of the
respective Group and apply such funds to acquire assets or reduce liabilities
of the Marathon Group, the U.S. Steel Group or the Delhi Group, respectively,
as the case may be.
 
  The above policies may be modified or rescinded in the sole discretion of the
Board without approval of the stockholders, although the Board has no present
intention to do so. The Board may also adopt additional policies depending upon
the circumstances. Any determination of the Board to modify or rescind such
policies, or to adopt additional policies, including any such decision that
would have disparate impacts upon holders of the separate classes of Common
Stock, would be made by the Board in good faith and in the honest belief that
such decision is in the best interest of all stockholders of USX.
 
ACCOUNTING MATTERS AND POLICIES
 
  USX prepares the Marathon Group, the U.S. Steel Group and the Delhi Group
financial statements in accordance with generally accepted accounting
principles, and these financial statements, taken together, comprise all of the
accounts included in the corresponding consolidated financial statements of
USX. The financial statements of the Marathon Group, the U.S. Steel Group and
the Delhi Group principally reflect the financial position and results of
operations of the businesses included therein. Consistent with the Certificate
of Incorporation and related policies, such group financial statements also
include portions of USX's corporate assets and liabilities (including
contingent liabilities). Principal corporate activities attributed to the
groups and reflected in their financial statements include financial
activities, corporate general and administrative costs, common stock
transactions and income taxes.
 
  The above policies may be modified or rescinded in the sole discretion of the
Board without approval of the stockholders, although the Board has no present
intention to do so. The Board may also adopt additional policies
 
                                       7
<PAGE>
 
depending upon the circumstances. Any determination of the Board to modify or
rescind such policies, or to adopt additional policies, including any such
decision that would have disparate impacts upon holders of the separate classes
of Common Stock, would be made by the Board in good faith and in the honest
belief that such decision is in the best interest of all stockholders of USX.
In addition, generally accepted accounting principles require that any change
in an accounting policy be preferable (in accordance with such principles) to
the previous policy.
 
                       DESCRIPTION OF THE DEBT SECURITIES
 
  The Debt Securities will be general unsecured obligations of USX and will
rank pari passu with the other general unsecured obligations of USX. The Debt
Securities will be issued under an Indenture, dated as of March 15, 1993,
between PNC Bank, National Association (the "Trustee") and USX (the
"Indenture"). A copy of the Indenture is filed as an exhibit to the
Registration Statements. The following summaries of certain provisions of the
Indenture do not purport to be complete and are qualified in their entirety by
reference to the provisions of the Indenture, which are incorporated by
reference herein. Certain capitalized terms used herein are defined in the
Indenture. The Section numbers referred to in the following summaries are
references to relevant sections of the Indenture.
 
GENERAL
 
  The Indenture does not limit the principal amount of Debt Securities or other
indebtedness which may be issued thereunder from time to time by USX and USX
may in the future issue additional Debt Securities (in addition to those
offered hereby) under the Indenture. As of September 30, 1993, an aggregate
principal amount of $600,000,000 of Debt Securities had been issued, and were
outstanding under, the Indenture.
 
  The Debt Securities of any Series may be issued in definitive form or, if
provided in the Prospectus Supplement relating thereto, may be represented in
whole or in part by a Global Security or Securities, registered in the name of
a Depositary designated by USX. Each Debt Security represented by a Global
Security is referred to herein as a "Book-Entry Security."
 
  Debt Securities may be issued from time to time pursuant to this Prospectus
in an aggregate principal amount or initial public offering price of up to
$850,000,000 or the equivalent thereof in foreign denominated currency or units
based on or relating to foreign denominated currencies, including European
Currency Units ("ECU"), and will be offered independently or together on terms
determined by market conditions at the time of sale. The Debt Securities may be
issued in one or more series with the same or various maturities and may be
sold at par, a premium or an original issue discount. Debt Securities sold at
an original issue discount may bear no interest or interest at a rate which is
below market rates.
 
  Reference is made to the Prospectus Supplement for the specific terms of the
Debt Securities offered hereby, including the following (to the extent
applicable to a particular series of Debt Securities): (i) designation,
aggregate principal amount, purchase price (expressed as a percentage of the
principal amount thereof), and denomination; (ii) date of maturity; (iii) if
other than currency of the United States, the currency or units based on or
relating to currencies for which Debt Securities may be purchased and in which
principal and any premium or interest will or may be payable; (iv) interest
rate or rates (or the manner of calculation thereof), if any; (v) the times at
which any such interest will be payable; (vi) the place or places where
principal and any premium and interest will be payable; (vii) any redemption or
sinking fund provisions or other repayment obligations and any remarketing
arrangements related thereto; (viii) any index used to determine the amount of
payment of principal of and any premium and interest on the Debt Securities;
(ix) the application, if any, of the defeasance provisions to the Debt
Securities; (x) if other than the principal amount thereof, the portion of the
principal amount of the Debt Securities which shall be payable upon declaration
of acceleration of the maturity thereof; (xi) if other than 100% of the
principal amount thereof plus accrued interest, the Change in Control Purchase
Price or Prices applicable to purchases of Debt Securities upon the occurrence
of a Change in Control; (xii) whether the Debt Securities will be issued in
whole or in part in the form of one or more Global Securities and, in such
case, the Depositary for such Global Securities; and (xiii) any other specific
terms of the Debt Securities, including any terms which may be required by or
advisable under United States laws or regulations.
 
                                       8
<PAGE>
 
  Except with respect to Book-Entry Securities, Debt Securities may be
presented for exchange or registration of transfer, in the manner, at the
places and subject to the restrictions set forth in the Debt Securities and the
Prospectus Supplement. Such services will be provided without charge, other
than any tax or other governmental charge payable in connection therewith, but
subject to the limitations provided in the Indenture. For a description of
payments of principal of and any premium and interest on, and transfer of,
Book-Entry Securities, and exchanges of Global Securities representing Book-
Entry Securities, see "Book-Entry Securities"hereunder.
 
CERTAIN COVENANTS OF USX
 
 Creation of Certain Liens
 
  If USX or any Subsidiary of USX shall mortgage, pledge, encumber or subject
to a lien (hereinafter to "Mortgage" or a "Mortgage," as the context may
require) as security for any indebtedness for money borrowed (i) any blast
furnace facility or raw steel producing facility, or rolling mills which are a
part of a plant which includes such a facility, or (ii) any property capable of
producing oil or gas; and which, in either case, is located in the United
States and is determined to be a principal property by the Board of Directors
of USX in its discretion, USX will secure or will cause such Subsidiary to
secure each Series of the Debt Securities equally and ratably with all
indebtedness or obligations secured by the Mortgage then being given and with
any other indebtedness of USX or such Subsidiary then entitled thereto;
provided, however, that this covenant shall not apply in the case of: (a) any
Mortgage existing on the date of the Indenture (whether or not such Mortgage
includes an after-acquired property provision); (b) any Mortgage, including a
purchase money Mortgage, incurred in connection with the acquisition of any
property (any Mortgage incurred within 180 days after such acquisition or the
completion of construction shall be deemed to be in connection with such
acquisition), the assumption of any Mortgage previously existing on such
acquired property or any Mortgage existing on the property of any corporation
when it becomes a Subsidiary of USX; (c) any Mortgage on such property in favor
of the United States, or any State, or instrumentality of either, to secure
partial, progress or advance payments to USX or any Subsidiary of USX pursuant
to the provisions of any contract or any statute; (d) any Mortgage on such
property in favor of the United States, any State, or instrumentality of
either, to secure borrowings for the purchase or construction of the property
Mortgaged; (e) any Mortgage in connection with a sale or other transfer of oil
or gas in place for a period of time or in an amount such that the purchaser
will realize therefrom a specified amount of money or specified amount of
minerals or any interest in property of the character commonly referred to as
an "oil payment" or "production payment"; (f) any Mortgage on any property
arising in connection with or to secure all or any part of the cost of the
repair, construction, improvement, alteration, exploration, development or
drilling of such property or any portion thereof; (g) any Mortgage on any
pipeline, gathering system, pumping or compressor station, pipeline storage
facility, other pipeline facility, drilling equipment, drilling platform,
drilling barge, any movable railway, marine or automotive equipment, gas plant,
office building, storage tank, or warehouse facility, any of which is located
on any property included under clause (ii) above; (h) any Mortgage on any
equipment or other personal property used in connection with any property
included under clause (ii) above; (i) any Mortgage on any property included
under clause (ii) above arising in connection with the sale of accounts
receivable resulting from the sale of oil or gas at the wellhead; or (j) any
renewal of or substitution for any Mortgage permitted under the preceding
clauses. Notwithstanding the foregoing, USX may and may permit its Subsidiaries
to grant Mortgages or incur liens on property covered by the restriction
described above so long as the net book value of the property so encumbered,
together with all property subject to the restriction on certain sale and
leasebacks described below, does not at the time such Mortgage or lien is
granted exceed five percent (5%) of Consolidated Net Tangible Assets, (as such
term is defined in the Indenture). (Section 4.03)
 
  "Consolidated Net Tangible Assets" means the aggregate value of all assets of
USX and its subsidiaries after deducting therefrom (a) all current liabilities
(excluding all long-term debt due within one year), (b) all investments in
unconsolidated subsidiaries and all investments accounted for on the equity
basis and (c) all goodwill, patent and trademarks, unamortized debt discount
and other similar intangibles (all determined in conformity with generally
accepted accounting principles and calculated on a basis consistent with USX's
most recent audited consolidated financial statements). (Section 1.01)
 
  As of the date of this Prospectus, neither USX nor any subsidiary of USX has
any property referred to in either clause (i) or (ii) above and in the
following subsection "Limitations on Certain Sales and Leasebacks" which has
been determined by the Board of Directors of USX to be a principal property.
 
                                       9
<PAGE>
 
 Limitations on Certain Sale and Leasebacks
 
  USX will not, nor will it permit any Subsidiary to, sell or transfer (i) any
blast furnace facility or raw steel producing facility, or rolling mills which
are a part of a plant which includes such a facility, or (ii) any property
capable of producing oil or gas; and which, in either case, is located in the
United States and is determined to be a principal property by the Board of
Directors of USX in its discretion, with the intention of taking back a lease
thereof, provided, however, this covenant shall not apply if (a) the lease is
to a Subsidiary (or to USX in the case of a Subsidiary); (b) the lease is for a
temporary period by the end of which it is intended that the use of the
property by the lessee will be discontinued; (c) USX or a Subsidiary could, in
accordance with Section 4.03, heretofore described, Mortgage such property
without equally and ratably securing the Debt Securities; (d) the transfer is
incident to or necessary to effect any operating, farm out, farm in,
unitization, acreage exchange, acreage contributions, bottom hole or dry hole
arrangements or pooling agreement or any other agreement of the same general
nature relating to the acquisition, exploration, maintenance, development and
operation of oil and gas properties in the ordinary course of business or as
required by regulatory agencies having jurisdiction over the property; or (e)
USX promptly informs the Trustee of such sale, the net proceeds of such sale
are at least equal to the fair value (as determined by resolution adopted by
the Board of Directors of USX) of such property and USX within 180 days after
such sale applies an amount equal to such net proceeds (subject to reduction by
reason of credits to which USX is entitled, under the conditions specified in
the Indenture) to the retirement or in substance defeasance of funded debt of
USX or a Subsidiary. (Section 4.04)
 
 Merger and Consolidation
 
  USX will not merge or consolidate with any other corporation or sell or
convey all or substantially all of its assets to any person, firm or
corporation, except that USX may merge or consolidate with, or sell or convey
all or substantially all of its assets to, any other corporation, provided that
(i) USX shall be the continuing corporation or the successor corporation (if
other than USX, as the case may be) shall be a corporation organized and
existing under the laws of the United States of America or a State thereof and
such corporation shall expressly assume the due and punctual payment of the
principal of and any premium and interest on all the Debt Securities, according
to their tenor, and the due and punctual performance and observance of all of
the covenants and conditions of the Indenture to be performed by USX and (ii)
USX or such successor corporation, as the case may be, shall not, immediately
after such merger, consolidation, sale or conveyance, be in default in the
performance of any such covenant or condition and no event which with the lapse
of time, the giving of notice or both would constitute an Event of Default
shall have occurred and be continuing. (Section 11.01)
 
  If upon any consolidation or merger of USX with or into any other
corporation, or upon any sale or conveyance of substantially all of the
properties of USX, or upon any acquisition by USX of all or any part of the
property of another corporation, any property owned immediately prior thereto
would thereupon become subject to any mortgage, lien, pledge, charge or
encumbrance, USX, prior to such event, will secure the Debt Securities (equally
and ratably with any other indebtedness of USX secured thereby) by a lien on
all of such property of USX, prior to all liens, charges and encumbrances other
than any theretofore existing thereon. (Section 11.03)
 
PURCHASE OF DEBT SECURITIES UPON A CHANGE IN CONTROL
 
  In the event of any Change in Control (as defined below) of USX, each holder
of Debt Securities will have the right, at that holder's option, subject to the
terms and conditions of the Indenture, to require USX to become obligated to
purchase all of that holder's Debt Securities on the date that is 35 Business
Days after the occurrence of such Change in Control (the "Change in Control
Purchase Date") at a cash price equal to (i) unless otherwise specified in the
terms of such Debt Securities, 100% of the principal amount thereof, together
with accrued interest to such Change in Control Purchase Date (except that
interest installments due prior to such Change in Control Purchase Date will be
payable to the holders of such Debt Securities of record at the close of
business on the relevant record dates according to their terms and the
provisions of the Indenture), or (ii) such other price or prices as may be
specified in the terms of such Debt Securities (the "Change in Control Purchase
Price"). (Section 4.07)
 
  Within 15 Business Days after a Change in Control, USX is obligated to mail
to the Trustee and to all holders of Debt Securities of any Series at their
addresses shown in the Debt Security register (and to beneficial owners as
 
                                       10
<PAGE>
 
required by applicable law) a notice regarding the Change in Control, stating,
among other things: (i) the last date on which the Change in Control purchase
right may be exercised, (ii) the Change in Control Purchase Price, (iii) the
Change in Control Purchase Date, (iv) the name and address of the Paying Agent,
and (iv) the procedures that holders must follow to exercise these rights. USX
will cause a copy of such notice to be published in a daily newspaper of
national circulation. (Section 4.07)
 
  To exercise this right, a holder of Debt Securities of any Series must
deliver a Change in Control Purchase Notice to the Paying Agent for that Series
at its address set forth in USX's notice regarding the Change in Control at any
time prior to the close of business on the Change in Control Purchase Date. The
Change in Control Purchase Notice shall state (i) the certificate numbers of
the Debt Securities to be delivered by the holder thereof for purchase by USX
and (ii) that such Debt Securities are to be purchased by USX pursuant to the
applicable provisions of the Debt Securities and USX's notice regarding the
Change in Control. (Section 4.07)
 
  Upon receipt by USX of the Change in Control Purchase Notice, the holder of
the Debt Security in respect of which such notice was given shall (unless such
notice is withdrawn as specified in the Indenture) thereafter be entitled to
receive solely the Change in Control Purchase Price with respect to such Debt
Security. Any Change in Control Purchase Notice may be withdrawn by the holder
of Debt Securities of any Series by a written notice of withdrawal delivered to
the Paying Agent for that Series at any time prior to the close of business on
the Change in Control Purchase Date. The notice of withdrawal shall state the
certificate numbers of the Debt Securities as to which the withdrawal notice
relates. (Section 4.08)
 
  Payment of the Change in Control Purchase Price for a Debt Security of any
Series for which a Change in Control Purchase Notice has been delivered and not
withdrawn is conditioned upon delivery of such Debt Security (together with
necessary endorsements) to the Paying Agent for that Series at its address set
forth in USX's notice regarding the Change in Control, at any time (whether
prior to, on or after the Change in Control Purchase Date) after the delivery
of such Change in Control Purchase Notice. (Section 4.07) Payment of the Change
in Control Purchase Price for such Debt Security will be made promptly
following the later of the Change in Control Purchase Date or the time of
delivery of such Debt Security. (Section 4.08)
 
  Under the Indenture, a "Change in Control" of USX is deemed to have occurred
at such time as (i) any "person" or "group" of persons (excluding USX, any
Subsidiary, any employee stock ownership plan or any other employee benefit
plan of USX) shall have acquired "beneficial ownership" (within the meaning of
Section 13(d) or 14(d) of the Exchange Act and the applicable rules and
regulations thereunder) of shares of Voting Stock representing at least 35% of
the outstanding Voting Power of USX, (ii) during any period of twenty-five
consecutive months, commencing before or after the date of the Indenture,
individuals who at the beginning of such twenty-five month period were
directors of USX (together with any replacement or additional directors whose
election was recommended by incumbent management of USX or who were elected by
a majority of directors then in office) cease to constitute a majority of the
board of directors of USX, or (iii) any person or group of related persons
shall acquire all or substantially all of the assets of USX; provided, that a
Change in Control shall not be deemed to have occurred pursuant to clause (iii)
above if USX shall have merged or consolidated with or transferred all or
substantially all of its assets to another corporation in compliance with the
provisions of Section 11.01 of the Indenture (relating to when USX may merge or
transfer assets) and the surviving or successor or transferee corporation is no
more leveraged than was USX immediately prior to such event. For purposes of
this definition, the term "leveraged" when used with respect to any corporation
shall mean the percentage represented by the total assets of that corporation
divided by its stockholders' equity, in each case determined and as would be
shown in a consolidated balance sheet of such corporation prepared in
accordance with generally accepted accounting principles in the United States
of America. The term "substantially all" in clause (iii) above has not been
quantified for purposes of defining Change in Control and, depending upon the
factual circumstances, there may be uncertainty as to when a Change in Control
has occurred for purposes of determining the rights of holders of Debt
Securities pursuant to this provsion.
 
  Notwithstanding the foregoing, a Change in Control will not be deemed to have
occurred by virtue of (i) USX, any Subsidiary of USX, any employee stock
ownership plan or any other employee benefit plan of USX or any such
Subsidiary, or any Person holding Voting Stock for or pursuant to the terms of
any such employee benefit
 
                                       11
<PAGE>
 
plan, acquiring beneficial ownership of shares of Voting Stock, whether
representing 35% or more of the outstanding Voting Power of USX or otherwise or
(ii) any Person whose ownership of shares of Voting Stock representing 35% or
more of the outstanding Voting Power of USX results solely from USX's
calculation from time to time of the relative voting rights of Marathon Stock,
Steel Stock and Delhi Stock.
 
  "Voting Stock" means stock of USX of any class or classes (however
designated) having ordinary voting power for the election of the directors of
USX, other than stock having such power only by reason of the happening of a
contingency. "Voting Power" means the total voting power represented by all
outstanding shares of all classes of Voting Stock. (Section 4.07)
 
  In the event a Change in Control occurs, USX intends to comply with any
applicable securities laws or regulations, including any applicable
requirements of Rule 14e-1 under the Exchange Act. The Change in Control
purchase feature of the Debt Securities may in certain circumstances make more
difficult or discourage a takeover of USX. The Change in Control purchase
feature, however, is not the result of management's knowledge of any specific
effort to accumulate shares of Common Stock or to obtain control of USX by
means of a merger, tender offer, solicitation or otherwise, or part of a plan
by management to adopt a series of anti-takeover provisions. The Change in
Control purchase feature is similar to that contained in other debt offerings
of USX as a result of negotiations between USX and the underwriters thereof.
 
  Except as described above, the Change in Control purchase feature does not
afford holders of the Debt Securities protection against possible adverse
effects of a reorganization, restructuring, merger or similar transaction
involving USX.
 
  Although USX's existing indebtedness does not limit USX's ability to purchase
Debt Securities, USX's ability to purchase Debt Securities in the future may be
limited by the terms of any then existing borrowing arrangements and by its
financial resources.
 
EVENTS OF DEFAULT
 
  An Event of Default with respect to Debt Securities of any Series is defined
in the Indenture as being: (i) default in the payment of the principal of or
premium, if any, on any of the Debt Securities of such Series when due and
payable; (ii) default in the payment of interest on the Debt Securities of such
Series when due, continuing for 30 days; (iii) default in the payment of the
Change in Control Purchase Price of any of the Debt Securities of such Series
as and when the same shall become due and payable; (iv) default in the deposit
of any sinking fund payment with respect to any Debt Security of such Series
when due; (v) failure by USX in the performance of any other covenant or
agreement in the Debt Securities of such Series or in the Indenture continued
for a period of 90 days after notice of such failure as provided in the
Indenture; (vi) certain events of bankruptcy, insolvency, or reorganization
with respect to USX; or (vii) any other Event of Default provided with respect
to Debt Securities of that Series. (Section 6.01)
 
  USX is required annually to deliver to the Trustee officers' certificates
stating whether or not the signers have any knowledge of any default in the
performance by USX of certain covenants. (Section 4.06)
 
  In case an Event of Default shall occur and be continuing with respect to any
Series, the Trustee or the holders of not less than 25% in principal amount of
the Debt Securities of such Series then outstanding may declare the Debt
Securities of such Series to be due and payable. (Section 6.01) The Trustee is
required to give holders of the Debt Securities of any Series written notice of
a default with respect to such Series as and to the extent provided by the
Trust Indenture Act. (Section 6.07)
 
  If, however, at any time after the Debt Securities of such Series have been
declared due and payable, and before any judgment or decree for the moneys due
has been obtained or entered, USX shall pay or deposit with the Trustee amounts
sufficient to pay all matured installments of interest upon the Debt Securities
of such Series and the principal of all Debt Securities of such Series which
shall have become due, otherwise than by acceleration, together with interest
on such principal and, to the extent legally enforceable, on such overdue
installments of interest and all other amounts due under the Indenture shall
have been paid, and any and all defaults with respect
 
                                       12
<PAGE>
 
to such Series under the Indenture shall have been remedied, then the holders
of a majority in aggregate principal amount of the Debt Securities of such
Series then outstanding, by written notice to USX and the Trustee, may waive
all defaults with respect to such Series and rescind and annul the declaration
that the Debt Securities of such Series are due and payable. (Section 6.01) In
addition, prior to any such declaration that the Debt Securities of such Series
are due and payable, the holders of a majority in aggregate principal amount of
the Debt Securities of such Series may waive any past default and its
consequences with respect to such Series, except a default in the payment of
the principal of or any premium or interest on any Debt Securities of such
Series. (Section 6.06)
 
  The Trustee is under no obligation to exercise any of the rights or powers
under the Indenture at the request, order or direction of any of the holders of
Debt Securities, unless such holders shall have offered to the Trustee
reasonable security or indemnity. (Section 7.02) Subject to such provisions for
the indemnification of the Trustee and certain limitations contained in the
Indenture, the holders of a majority in aggregate principal amount of the Debt
Securities of each Series at the time outstanding shall have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the Trustee, or exercising any trust or power conferred on the
Trustee, with respect to the Debt Securities of such Series. (Section 6.06)
 
MODIFICATION OF THE INDENTURE
 
  The Indenture contains provisions permitting USX and the Trustee to modify
the Indenture or enter into or modify any supplemental indenture without the
consent of the holders of the Debt Securities in regard to matters as shall not
adversely affect the interests of the holders of the Debt Securities,
including, without limitation, the following: (a) to evidence the succession of
another corporation to USX; (b) to add to the covenants of USX further
covenants, restrictions, conditions or provisions for the benefit or protection
of the holders of any or all Series of Debt Securities or to surrender any
right or power conferred upon USX by the Indenture; (c) to cure any ambiguity
or to correct or supplement any provision of the Indenture (or supplements)
which may be defective or inconsistent with any other provision in the
Indenture (or supplements); to convey, transfer, assign, mortgage or pledge any
property to or with the Trustee; or to make such other provisions in regard to
matters or questions arising under the Indenture as shall not adversely affect
the interests of the holders of the Debt Securities then outstanding; (d) to
add to, change or eliminate any of the provisions of the Indenture in respect
of one or more Series of Debt Securities thereunder, under certain conditions
specified therein; (e) to evidence the appointment of a successor trustee and
to add to or change provisions of the Indenture necessary to provide for or
facilitate the administration of the trusts under the Indenture by more than
one trustee; (f) to set forth the form and any terms of any Series of Debt
Securities which USX and the Trustee deem necessary or desirable to include in
a supplemental indenture; and (g) to add to or change any of the provisions of
the Indenture to such extent as shall be necessary or desirable to permit or
facilitate the issuance of Debt Securities in bearer form, registrable or not
registrable as to principal, and with or without interest coupons. USX and the
Trustee may otherwise modify the Indenture or any supplemental indenture with
the consent of the holders of not less than 66 2/3% in aggregate principal
amount of each Series of Debt Securities affected thereby at the time
outstanding, except that no such modifications shall (i) extend the fixed
maturity of any Debt Securities, or reduce the principal amount thereof or
reduce the rate or extend the time of payment of any premium or interest
thereon, or change the currency in which the Debt Securities are payable,
without the consent of the holder of each Debt Security so affected, or (ii)
reduce the aforesaid percentage of Debt Securities of any Series, the consent
of the holders of which is required for any such modifications or supplemental
indenture, without the consent of the holders of all Debt Securities affected
thereby then outstanding. (Article Ten)
 
SATISFACTION AND DISCHARGE; DEFEASANCE AND COVENANT DEFEASANCE
 
  The Indenture shall be satisfied and discharged if (i) USX shall deliver to
the Trustee all Debt Securities then outstanding for cancellation or (ii) all
Debt Securities shall have become due and payable or are to become due and
payable within one year and USX shall deposit an amount sufficient to pay the
principal, premium, if any, and interest to the date of maturity, provided that
in either case USX shall have paid all other sums payable under the Indenture.
(Section 12.01)
 
  The Indenture provides, if such provision is made applicable to the Debt
Securities of a Series, that USX may elect either (A) to defease and be
discharged from any and all obligations with respect to any Debt Security of
 
                                       13
<PAGE>
 
such Series (except for the obligations to register the transfer or exchange of
such Debt Security, to replace temporary or mutilated, destroyed, lost or
stolen Debt Securities, to maintain an office or agency in respect of the Debt
Securities and to hold moneys for payment in trust) ("defeasance") or (B) to be
released from its obligations with respect to such Debt Security under Sections
4.03, 4.04, 4.07, 4.09, 11.01 and 11.03 of the Indenture (being the
restrictions described above under "Certain Covenants of USX" and USX's
obligations described under "Purchase of Debt Securities upon a Change in
Control") and (ii) that Sections 6.01(d), 6.01(e) (as to Sections 4.03, 4.04,
4.07, 4.09, 11.01 and 11.03) and 6.01(h), as described in clauses (iv), (v) and
(vii) under "Events of Default" above, shall not be deemed to be Events of
Default under the Indenture with respect to such Series ("covenant
defeasance"), upon the deposit with the Trustee (or other qualifying trustee),
in trust for such purpose, of money and/or Government Obligations (as defined)
which through the payment of principal and interest in accordance with their
terms will provide money, in an amount sufficient to pay the principal of (and
premium, if any) and interest on such Debt Security, on the scheduled due dates
therefor. In the case of defeasance, the holders of such Debt Securities are
entitled to receive payments in respect of such Debt Securities solely from
such Trust. Such a trust may only be established if, among other things, USX
has delivered to the Trustee an Opinion of Counsel (as specified in the
Indenture) to the effect that the holders of the Debt Securities affected
thereby will not recognize income, gain or loss for Federal income tax purposes
as a result of such defeasance or covenant defeasance and will be subject to
Federal income tax on the same amounts, in the same manner and at the same
times as would have been the case if such defeasance or covenant defeasance had
not occurred. Such Opinion of Counsel, in the case of defeasance under clause
(A) above, must refer to and be based upon a ruling of the Internal Revenue
Service or a change in applicable Federal income tax law occurring after the
date of the Indenture. (Section 12.02)
 
RECORD DATES
 
  The Indenture provides that in certain circumstances USX or the Trustee may
establish a record date for determining the holders of outstanding Debt
Securities of a Series entitled to join in the giving of notice or the taking
of other action under the Indenture by the holders of the Debt Securities of
such Series.
 
BOOK-ENTRY SECURITIES
 
  The following description of Book-Entry Securities will apply to any Series
of Debt Securities issued in whole or in part in the form of a Global Security
or Securities except as otherwise provided in the Prospectus Supplement
relating thereto.
 
  Upon issuance, all Book-Entry Securities of like tenor and having the same
date of original issue will be represented by a single Global Security. Each
Global Security representing Book-Entry Securities will be deposited with, or
on behalf of, the Depositary, which will be a clearing agent registered under
the Exchange Act. The Global Security will be registered in the name of the
Depositary or a nominee of the Depositary.
 
  Ownership of beneficial interest in a Global Security representing Book-Entry
Securities will be limited to institutions that have accounts with the
Depositary or its nominee ("participants") or persons that may hold interests
through participants. In addition, ownership of beneficial interests by
participants in such a Global Security will only be evidenced by, and the
transfer of that ownership interest will only be effected through, records
maintained by the Depositary or its nominee for such Global Security. Ownership
of beneficial interest in such a Global Security by persons that hold through
participants will only be evidenced by, and the transfer of that ownership
interest within such participant will only be effected through, records
maintained by such participant. The laws of some jurisdictions require that
certain purchasers of securities take physical delivery of such securities in
definitive form. Such laws may impair this ability to transfer beneficial
interests in such a Global Security.
 
  Payment of principal of and any premium and interest on Book-Entry Securities
represented by any Global Security registered in the name of or held by the
Depositary or its nominee will be made to the Depositary or its nominee, as the
case may be, as the registered owners and holder of the Global Security
representing such Book-Entry Securities. None of USX, the Trustee or any agent
of USX or the Trustee will have any responsibility or liability for any aspect
of the Depositary's records or any participant's records relating to or
payments made on account of beneficial ownership interests in a Global Security
representing such Book-Entry Securities or for maintaining, supervising or
reviewing any of the Depositary's records or any participant's records relating
to such
 
                                       14
<PAGE>
 
beneficial ownership interests. Payments by participants to owners of
beneficial interests in a Global Security held through such participants will
be governed by the Depositary's procedures, as is now the case with securities
held for the accounts of customers registered in "street name," and will be the
sole responsibility of such participants.
 
  No Global Security may be transferred except as a whole by the Depositary for
such Global Security to a nominee of the Depositary or by a nominee of the
Depositary to the Depositary or another nominee of the Depositary.
 
  A Global Security representing Book-Entry Securities of any Series is
exchangeable for definitive Debt Securities of such Series in registered form,
of like tenor and of an equal aggregate principal amount, only if (a) the
Depositary notifies USX that it is unwilling or unable to continue as
Depositary for such Global Security or the Depositary ceases to be a clearing
agency registered under the Exchange Act, (b) USX in its sole discretion
determines that such Global Security shall be exchangeable for definitive Debt
Securities in registered form, or (c) there shall have occurred and be
continuing an Event of Default with respect to the Debt Securities of that
Series. Any Global Security that is exchangeable pursuant to the preceding
sentence shall be exchangeable in whole for definitive Debt Securities in
registered form, of like tenor and of an equal aggregate principal amount, and
in the authorized denominations for that Series. Such definitive Debt
Securities shall be registered in the name or names of such person or persons
as the Depositary shall instruct the Trustee. It is expected that such
instructions may be based upon directions received by the Depositary from its
participants with respect to ownership of beneficial interests in such Global
Security.
 
  Except as provided above, owners of beneficial interests in such Global
Security will not be entitled to receive physical delivery of Debt Securities
in definitive form and will not be considered the holders thereof for any
purpose under the Indenture, and no Global Security representing Book-Entry
Securities shall be exchangeable, except for another Global Security of like
denomination and tenor to be registered in the name of the Depositary or its
nominee. Accordingly, each person owning a beneficial interest in such Global
Security must rely on the procedures of the Depositary and, if such person is
not a participant, on the procedures of the participant through which such
person owns its interest, to exercise any rights of a holder under the
Indenture. USX understands that under existing industry practices, in the event
that USX requests any action of holders or an owner of a beneficial interest in
such Global Security desires to give or take any action that a holder is
entitled to give or take under the Indenture, the Depositary would authorize
the participants holding the relevant beneficial interests to give or take such
action, and such participants would authorize beneficial owners owning through
such participant to give or take such action or would otherwise act upon the
instructions of beneficial owners owning through them.
 
CONCERNING THE TRUSTEE
 
  PNC Bank, National Association is also trustee for Marathon Oil Company's 9
1/2% Guaranteed Notes due 1994, its 9 3/4% Guaranteed Notes due 1999, and its
Monthly Interest Guaranteed Notes Due 2002 9 3/4% to March 1, 1994 and 7%
Thereafter all of which are guaranteed by USX, for eighteen series of
obligations issued by various governmental authorities relating to
environmental projects at various USX facilities, for an aggregate principal
amount of $1,500,000,000 of debt securities issued by USX under an Indenture
between USX and the Trustee dated July 1, 1991 and for $600,000,000 of Debt
Securities which have heretofore been issued by USX under the Indenture. USX
and its subsidiaries maintain ordinary banking relationships, including loans
and deposit accounts, with PNC Bank, National Association and anticipate that
they will continue to do so.
 
                          DESCRIPTION OF CAPITAL STOCK
 
  The following is a description of the terms of the capital stock of USX
included in the Certificate of Incorporation. This description does not purport
to be complete and is qualified in its entirety by reference to the Certificate
of Incorporation, and the Amended and Restated Rights Agreement (the "Restated
Rights Agreement") between USX and Mellon Bank, N.A., as Rights Agent (the
"Rights Agent"), which have been filed as exhibits to the Registration
Statement of which this Prospectus is a part.
 
                                       15
<PAGE>
 
GENERAL
 
  The authorized capital stock of USX consists of (i) 40 million shares of
preferred stock, without par value (the "Preferred Stock"), of which four
million shares are designated as Adjustable Rate Cumulative Preferred Stock
("Adjustable Rate Preferred Stock"), 6,900,000 are designated as 6.50%
Cumulative Convertible Preferred Stock ("6.50% Convertible Preferred Stock")
and eight million shares are designated as Series A Junior Preferred Stock,
(ii) 550 million shares of a class of common stock designated as USX-Marathon
Group Common Stock, par value $1.00 per share, (iii) 200 million shares of a
class of common stock designated as USX-U.S. Steel Group Common Stock, par
value $1.00 per share and (iv) 50 million shares of a class of common stock
designated as USX-Delhi Group Common Stock, par value $1.00 per share. As of
December 9, 1993, there were 2,099,970 shares of Adjustable Rate Preferred
Stock, 6,900,000 shares of 6.50% Convertible Preferred Stock, 286,581,539
shares of Marathon Stock, 70,289,545 shares of Steel Stock and 9,187,058 shares
of Delhi Stock issued and outstanding. No shares of Series A Junior Preferred
Stock are outstanding. The Marathon Stock, the Steel Stock and the Delhi Stock
are together referred to as "Common Stock."
 
  As used herein:
 
    "Delhi Group" shall mean, (i) all of the businesses in which any of Delhi
  Gas Pipeline Corporation ("DGPC"), The Nueces Company, Delhi Gasmark, Inc.
  (previously Texas Gasmark, Inc.), Tonkawa Gas Processing Company, Delhi Gas
  Marketing Corp. (previously TXO Gas Marketing Corp.), Delhi Gas Ventures
  Corp. (previously TXO Gas Ventures Corp.), Red River Gas Pipeline
  Corporation, Ozark Gas Pipeline Corporation, Sweetwater Pipeline
  Corporation, Western Gas Transmission, Inc., and Western Gas Corporation
  (or any of their predecessors or successors) is or has been engaged,
  directly or indirectly, (ii) all assets and liabilities of USX to the
  extent attributed to any of such businesses, whether or not such assets or
  liabilities are or were assets and liabilities of such companies and (iii)
  such businesses, assets and liabilities acquired by USX for the Delhi Group
  as determined by the Board to be included in the Delhi Group; provided
  that, from and after any dividend or distribution with respect to any
  shares of Delhi Stock, or any repurchase of shares of Delhi Stock from
  holders of Delhi Stock generally, the Delhi Group shall no longer include
  an amount of assets or properties of the Delhi Group equal to the aggregate
  amount of such kind of properties or assets so paid in respect of shares of
  Delhi Stock multiplied by a fraction, the numerator of which is equal to
  one less the Delhi Fraction and the denominator of which is equal to the
  Delhi Fraction. If all of the outstanding shares of Steel Stock are
  exchanged for shares of Delhi Stock as set forth under "Steel Stock
  Exchange and Redemption" below, all of the businesses, assets and
  liabilities of the U.S. Steel Group shall be included in the Delhi Group.
 
    "Delhi Fraction" means, on any date, a fraction the numerator of which
  shall be the number of shares of Delhi Stock outstanding on such date and
  the denominator of which shall be initially 14,000,000 shares; provided
  that such fraction shall not be greater than one. The denominator of the
  Delhi Fraction shall be adjusted to reflect subdivisions, combinations and
  other reclassifications of Delhi Stock, stock dividends payable in shares
  of Delhi Stock to holders thereof, the issuance of shares of Delhi Stock
  the proceeds of which are attributed to the Delhi Group and repurchases by
  USX of shares of Delhi Stock.
 
    "Disposition" shall mean the sale, transfer, assignment or other
  disposition (whether by merger, consolidation, sale or contribution of
  assets or stock or otherwise) of properties or assets.
 
    "Marathon Group" means, at any time, (w) all businesses in which any of
  Marathon Oil Company, Texas Oil & Gas Corp., Carnegie Natural Gas Company
  and Apollo Gas Company (or any of their predecessors or successors) is or
  has been engaged, directly or indirectly, other than the businesses of the
  Delhi Group after October 2, 1992 (the date of first issuance of Delhi
  Stock), (x) all assets and liabilities of USX to the extent attributed to
  any of such businesses, whether or not such assets or liabilities are or
  were assets or liabilities of such companies, (y) a proportionate interest
  in the business, assets and liabilities of the Delhi Group equal to one
  less the Delhi Fraction and (z) such businesses, assets and liabilities
  acquired by USX for the Marathon Group after May 6, 1991, as determined by
  the Board to be included in the Marathon Group; provided that after any
  dividend or distribution with respect to any shares of Delhi Stock, or any
  repurchase of shares of Delhi Stock from holders of Delhi Stock generally,
  the Marathon Group shall include an amount of assets or
 
                                       16
<PAGE>
 
  properties of the Delhi Group equal to the aggregate amount of such kind of
  assets or properties so paid in respect of shares of Delhi Stock multiplied
  by a fraction, the numerator of which is equal to one less the Delhi
  Fraction and the denominator of which is equal to the Delhi Fraction.
 
    "Market Value" of any class of Common Stock of USX on any Business Day
  means the average of the high and low reported sales prices regular way of
  a share of such class on such Business Day or, in case no such reported
  sale takes place on such Business Day, the average of the reported closing
  bid and asked prices regular way of a share on such class on such Business
  Day, in either case on the Composite Tape, or if the shares of such class
  are not listed or admitted to trading on the NYSE on such Business Day, on
  specified alternative markets, or, if not listed or admitted to trading on
  such markets, the market value as determined by the Board, subject to
  adjustments necessary to reflect any dividends (other than regular cash
  dividends) or distributions on, or subdivisions or combinations of,
  outstanding shares of such class. "Business Day" means each weekday other
  than any day on which any relevant class of Common Stock is not traded on
  any national securities exchange or the National Association of Securities
  Dealers Automated Quotations National Market System or in the over-the-
  counter market.
 
    "Net Proceeds," as of any date, from any Disposition of any of the
  properties and assets of the U.S. Steel Group or the Delhi Group, as the
  case may be, shall mean an amount, if any, equal to the gross proceeds of
  such Disposition after payment of, or reasonable provision for (i) any
  taxes payable by USX in respect of such Disposition, (ii) any taxes payable
  by USX in respect of any dividend or redemption pursuant to a dividend or
  redemption paid to holders of Steel Stock or Delhi Stock, as the case may
  be, in connection with such Disposition, (iii) any transaction costs,
  including, without limitation, any legal, investment banking and accounting
  fees and expenses and (iv) any liabilities (contingent or otherwise) of, or
  allocated to, the U.S. Steel Group or the Delhi Group, as the case may be,
  including, without limitation any indemnity obligations incurred in
  connection with the Disposition. For purposes of this definition, any
  properties and assets of the U.S. Steel Group or the Delhi Group, as the
  case may be, remaining after such Disposition shall constitute "reasonable
  provision" for such amount of taxes, costs and liabilities (contingent or
  otherwise) as can be supported by such properties and assets. To the extent
  the proceeds of any Disposition include any securities or other property
  other than cash, the Board of Directors shall determine the value of such
  securities or property.
 
    "U.S. Steel Group" means, at any time, all of the businesses in which USX
  is or has been engaged, directly or indirectly, and all assets and
  liabilities of USX, other than any businesses, assets or liabilities of the
  Marathon Group or the Delhi Group if any shares of Marathon Stock or Delhi
  Stock are outstanding.
 
PREFERRED STOCK
 
  The authorized Preferred Stock may be issued without the approval of the
holders of Common Stock in one or more series, from time to time, with each
such series to have such designation, powers, preferences and relative,
participating, optional or other special rights, and qualifications,
limitations or restrictions thereof, as shall be stated in a resolution
providing for the issue of any such series adopted by the Board and as
described in the appropriate Prospectus Supplement (if any). The future
issuance of Preferred Stock may have the effect of delaying, deferring or
preventing a change in control of USX.
 
  Holders of the Adjustable Rate Preferred Stock are entitled to receive
cumulative dividends, to be declared and paid before declaration and payment of
dividends on USX's common stock, at an adjustable rate within a range of 7 1/2%
to 15 3/4% per annum. The Adjustable Rate Preferred Stock can be redeemed by
USX at its sole option at any time or from time to time, in whole or in part,
at a redemption price of $50 per share, plus accrued and unpaid dividends
thereon. See "Amended and Restated Rights Plan" below.
 
  Holders of the 6.50% Convertible Preferred Stock are entitled to receive
cumulative dividends, to be declared and paid before declaration and payment of
dividend on USX's common stock, at the rate of 6.50% per annum. The 6.50%
Convertible Preferred Stock is not redeemable prior to April 1, 1996, except as
described below. On and after such date, the 6.50% Convertible Preferred Stock
is redeemable at the option of USX under certain circumstances, in whole or in
part, for cash, initially at a price of $52.275 per share, and thereafter at
prices
 
                                       17
<PAGE>
 
declining annually on each April 1 to an amount equal to $50.00 per share on
and after April 1, 2003, plus, in each case, an amount equal to accrued and
unpaid dividends to the redemption date. If USX exchanges all of the
outstanding Steel Stock for shares of a wholly owned subsidiary of USX to which
all of the assets and liabilities of the U.S. Steel Group have been
transferred, pays a dividend on or redeems shares of Steel Stock with the Net
Proceeds from the Disposition of all or substantially all of the assets of the
U.S. Steel Group, pays a dividend on, or USX or any of its subsidiaries
consummates a tender or exchange offer for, Steel Stock, and the aggregate
amount of such dividend or the consideration paid in such tender or exchange
offer is an amount equal to all or substantially all of the assets, the 6.50%
Convertible Preferred Stock is required to be redeemed, in whole, for $50.00
per share, plus dividends accrued and unpaid to the redemption date. The 6.50%
Convertible Preferred Stock is required to be redeemed under certain other
limited circumstances. The 6.50% Convertible Preferred Stock will not be
entitled to the benefit of any sinking fund.
 
  Shares of the 6.50% Convertible Preferred Stock are convertible at any time
at the option of the holder, unless previously redeemed, into shares of Steel
Stock, at a conversion price of $46.125 per share of Steel Stock (equivalent to
a conversion rate of 1.084 shares of Steel Stock for each share of 6.50%
Convertible Preferred Stock), subject to adjustment in certain circumstances.
 
  The holders of the Adjustable Rate Preferred Stock and the 6.50% Convertible
Preferred Stock have no vote except certain class votes in limited
circumstances. Upon the dissolution, liquidation or winding-up of USX, the
holders of the Adjustable Rate Preferred Stock and the 6.50% Convertible
Preferred Stock are entitled to receive out of the assets of USX available for
distribution to stockholders, before any payment or distribution shall be made
on USX's Common Stock or any other class of stock ranking junior to such series
upon liquidation, the amount of $50 per share plus all accrued and unpaid
dividends thereon.
 
MARATHON STOCK
 
  DIVIDENDS--DIVIDENDS ON THE MARATHON STOCK ARE INTENDED TO BE PAID BASED ON
THE FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF THE MARATHON GROUP.
 
  Subject to any prior rights of the holders of the Preferred Stock, dividends
may be paid on the Marathon Stock as determined by the Board out of funds of
USX legally available therefor.
 
  The Board may, in its sole discretion, declare and pay dividends exclusively
on the Marathon Stock, exclusively on the Steel Stock, exclusively on the Delhi
Stock or on such classes in equal or unequal amounts, notwithstanding the
respective amount of funds available for dividends on each class, the
respective voting and liquidation rights of each class, the amount or prior
dividends declared on each class or any other factor.
 
  EXCHANGE AND REDEMPTION--MARATHON STOCK MAY BE EXCHANGED FOR SHARES OF A
SUBSIDIARY OF USX TO WHICH USX WOULD HAVE TRANSFERRED ALL OF THE ASSETS AND
LIABILITIES OF THE MARATHON GROUP.
 
  At any time after the transfer of all the assets and liabilities of the
Marathon Group to a wholly-owned subsidiary of USX (the "Marathon Group
Subsidiary"), the Board may, in its sole discretion and by a majority vote of
the directors then in office, provided that there are funds of USX legally
available therefor, exchange all of the outstanding shares of Marathon Stock
for all of the outstanding shares of the common stock of the Marathon Group
Subsidiary (the "Marathon Group Subsidiary Stock"), on a pro rata basis.
 
  General Redemption Provisions: In the event of any exchange or redemption of
a class of Common Stock, USX shall cause to be given to each holder of such
Common Stock a notice stating (A) that shares of such Common Stock shall be
exchanged or redeemed, as the case may be, (B) the date of the exchange or
redemption, (C) in the event of a partial redemption, the number of shares of
Steel Stock or Delhi Stock, as the case may be, to be redeemed, (D) the kind
and amount of shares of capital stock or cash and/or securities or other
property to be received by such holder with respect to each share of such class
of Common Stock held by such holder, including details as to the calculation
thereof, (E) the place or places where certificates for shares of such class of
Common Stock, properly endorsed or assigned for transfer (unless USX waives
such requirement), are to be surrendered for
 
                                       18
<PAGE>
 
delivery of certificates for shares of such capital stock or cash and/or
securities or other property and (F) that, except as provided in the second
following paragraph, dividends on such shares of Common Stock will cease to be
paid as of such exchange date or redemption date. Such notice shall be sent by
first-class mail, postage prepaid, not less than 30 nor more than 60 days prior
to the exchange date or redemption date, as the case may be, and in any case to
each holder of such class of Common Stock to be exchanged or redeemed, at such
holder's address as the same appears on the stock transfer books of USX.
Neither the failure to mail such notice to any particular holder of such class
of Common Stock nor any defect therein shall affect the sufficiency thereof
with respect to any other holder of such class of Common Stock.
 
  If less than all of the outstanding shares of Steel Stock or Delhi Stock, as
the case may be, are to be redeemed, such shares shall be redeemed by USX pro
rata among the holders of such class of Common Stock or by such other method as
may be determined by the Board to be equitable.
 
  No adjustments in respect of dividends shall be made upon the exchange or
redemption of any shares of any class of Common Stock; provided, however, that
if such shares are exchanged or redeemed by USX after the record date for
determining holders of such class of Common Stock entitled to any dividend or
distribution thereon, such dividend or distribution shall be payable to the
holders of such shares at the close of business on such record date
notwithstanding such exchange or redemption.
 
  Before any holder of shares of any class of Common Stock shall be entitled to
receive certificates representing shares of any kind of capital stock or cash
and/or securities or other property to be received by such holder with respect
to any exchange or redemption of such class of Common Stock, such holder shall
surrender at such office as USX shall specify certificates for such shares of
such class of Common Stock, properly endorsed or assigned for transfer (unless
USX shall waive such requirement). As soon as practicable after surrender of
certificates for shares of such class of Common Stock, USX will deliver to the
holder of such shares so surrendered the certificates representing the number
of whole shares of the kind of capital stock or cash and/or securities or other
property to which such holder is entitled, together with any fractional payment
referred to below. If less than all of the shares of such class of Common Stock
represented by any one certificate are to be redeemed, USX will issue and
deliver a new certificate for the shares of such class of Common Stock not
redeemed.
 
  USX shall not be required to issue or deliver fractional shares of any class
of capital stock or any fractional securities to any holder of any class of
Common Stock upon any exchange, redemption, dividend or other distribution. If
more than one share of such class of Common Stock shall be held at the same
time by the same holder, USX may aggregate the number of shares of any class of
capital stock that shall be issuable or the amount of securities that shall be
deliverable to such holder upon any exchange, redemption, dividend or other
distribution (including any fractions of shares or securities). If the number
of shares of any class of capital stock or the amount of securities remaining
to be issued or delivered to any holder of any class of Common Stock is a
fraction, USX shall, if such fraction is not issued or delivered to such
holder, pay a cash adjustment in respect of such fraction in an amount equal to
the fair market value of such fraction on the fifth Business Day prior to the
date such payment is to be made. For purposes of the preceding sentence, "fair
market value" of any fraction shall be (i) in the case of any fraction of a
share of capital stock of USX, the product of such fraction and the Market
Value of one share of such capital stock and (ii) in the case of any other
fractional security, such value as is determined by the Board.
 
  VOTING--SHARES OF MARATHON STOCK SHALL HAVE ONE VOTE PER SHARE. SHARES OF
STEEL STOCK AND DELHI STOCK WILL, WHEN VOTING TOGETHER WITH ALL OTHER CLASSES
OF COMMON STOCK, HAVE A NUMBER OF VOTES PER SHARE BASED UPON THE TIME WEIGHTED
AVERAGE RATIOS OF THE MARKET VALUE OF A SHARE OF STEEL STOCK OR DELHI STOCK, AS
THE CASE MAY BE, TO THE MARKET VALUE OF A SHARE OF MARATHON STOCK.
 
  Except as set forth below and under "Steel Stock--Voting" and "Delhi Stock--
Voting" below, holders of all classes of Common Stock vote together as a single
class on all matters as to which all holders of Common Stock are entitled to
vote. On all matters to be voted on by the holders of all classes of Common
Stock together as a single class, (i) each share of outstanding Marathon Stock
has one vote and (ii) each share of Delhi Stock and Steel Stock has a number of
votes equal to the quotient (calculated to the nearest three decimal places),
as of the fifth Business Day prior to the applicable record date, of (A) the
sum of (1) four times the average ratio of X/Y for the five-Business Day period
ending on such fifth Business Day, (2) three times the average ratio of X/Y for
the next preceding five-Business Day period, (3) two times the average ratio of
X/Y for the next preceding five-Business
 
                                       19
<PAGE>
 
Day period and (4) the average ratio of X/Y for the next preceding five-
Business Day period, divided by (B) ten, where X is the Market Value of the
Delhi Stock or the Steel Stock, as the case may be, and Y is the Market Value
of the Marathon Stock, or if there are no shares of Marathon Stock outstanding
on such record date or on any of the 25 Business Days prior thereto, the sum of
the Market Values of the Steel Stock and of the Delhi Stock. If shares of only
one class of Common Stock are outstanding, each share of that class shall have
one vote.
 
  Assuming that the time weighted averages of the Market Values of Marathon
Stock, Steel Stock and Delhi Stock were $17, $39 and $16, respectively the per
share voting rights of Marathon Stock, Steel Stock and Delhi Stock would be one
vote, 2.29 votes and .94 vote per share, respectively. If the Marathon Stock,
the Steel Stock and the Delhi Stock had such per share voting rights as of
December 9, 1993, the holders of Marathon Stock, Steel Stock and Delhi Stock
would have approximately 62%, 35% and 3% respectively, of the total voting
power of USX.
 
  In addition, the approval of the holders of at least 66 2/3% of the
outstanding Marathon Stock, voting as a separate class, shall be necessary for:
 
    (i) the declaration or payment of any dividend, or the making of any
  other payment or distribution on or with respect to, any shares of any
  other class of Common Stock, if such dividend, payment or distribution is
  to be made with (A) proceeds from the sale, transfer, assignment or other
  disposition (whether by merger, consolidation, sale or contribution of
  assets or stock or otherwise) (a "Disposition") of any of the properties
  and assets of the Marathon Group or (B) any portion of an equity interest
  in a person, entity or group that owns any of the properties and assets of
  the Marathon Group; or
 
    (ii) the use, or reservation for use, of any proceeds from the
  Disposition of any of the properties and assets of the Marathon Group, or
  any of the properties and assets acquired with such proceeds, in any
  business of the Corporation other than the Marathon Group.
 
Notwithstanding the foregoing, however, such vote shall not be required if such
proceeds are loaned at a rate or rates representative of actual borrowings and
short-term investments by USX.
 
  The vote or consent of the holders of a majority of all of the outstanding
shares of any class of Common Stock, voting as a separate class, is currently
required under Delaware law for any amendment to the Certificate of
Incorporation that would increase or decrease the par value of the shares of
such class or alter or change the powers or special rights of the shares of
such class so as to affect them adversely. The Certificate of Incorporation
provides that neither the increase nor decrease of the authorized number of
shares of any class of Common Stock shall require a separate vote of any class.
Thus, it is possible that the holders of a majority of one or more classes of
Common Stock could constitute a majority of the voting power of all classes and
approve the increase or decrease of the authorized amount of any other class of
Common Stock without the approval of the holders of such other class of Common
Stock.
 
  The Certificate of Incorporation also provides that unless the vote or
consent of a greater number of shares shall then be required by law, the
approval of the holders of a majority of the outstanding shares of any class of
Common Stock, voting as a separate class, shall be necessary for authorizing,
effecting or validating the merger or consolidation of USX into or with any
other corporation if such merger or consolidation would adversely affect the
powers or special rights of such class of Common Stock, either directly or
indirectly.
 
  LIQUIDATION--IN THE EVENT OF THE LIQUIDATION OF USX, HOLDERS OF EACH CLASS OF
COMMON STOCK WILL BE ENTITLED TO RECEIVE A PORTION OF THE FUNDS DISTRIBUTABLE
TO HOLDERS OF ALL CLASSES OF COMMON STOCK BASED UPON THE TIME-WEIGHTED AVERAGE
AGGREGATE MARKET CAPITALIZATION OF EACH SUCH CLASS OF COMMON STOCK TO THE
AGGREGATE MARKET CAPITALIZATION OF ALL CLASSES OF COMMON STOCK.
 
  The Certificate of Incorporation provides that, in the event of a
dissolution, liquidation or winding-up of USX, whether voluntary or
involuntary, after payment of creditors and after the holders of Preferred
Stock receive the full preferential amounts to which they are entitled, the
holders of outstanding shares of each class of Common Stock will share the
funds remaining for distribution to the holders of Common Stock. The holders of
the outstanding Common Stock will each be entitled to receive a fraction of
such funds equal to the quotient of (i) the
 
                                       20
<PAGE>
 
sum of (A) four times the average ratio of X/Y for the five-Business Day period
ending on the Business Day prior to the date of the public announcement of (1)
a voluntary dissolution, liquidation or winding-up by USX or (2) the
institution of any proceeding for the involuntary dissolution, liquidation or
winding-up of USX, (B) three times the average ratio of X/Y for the next
preceding five-Business Day period, (C) two times the average ratio of X/Y for
the next preceding five-Business Day period and (D) the average ratio of X/Y
for the next preceding five-Business Day period, divided by (ii) ten, where X
is the market capitalization of such class of Common Stock and Y is the
aggregate market capitalization of all classes of Common Stock. For purposes of
the preceding sentence, "Market Capitalization" of any class of Common Stock on
any day shall mean the product of (i) the Market Value of such class of Common
Stock on such day and (ii) the number of shares of such class of Common Stock
outstanding on such day.
 
STEEL STOCK
 
  DIVIDENDS--DIVIDENDS ON THE STEEL STOCK ARE INTENDED TO BE PAID BASED UPON
THE FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF THE U.S. STEEL GROUP.
   
  Subject to any prior rights of the holders of the Preferred Stock, dividends
on the Steel Stock may be declared and paid only out of the lesser of (i) funds
of USX legally available therefor and (ii) the Available Steel Dividend Amount.
    
  The "Available Steel Dividend Amount," on any date, means either:
 
    (a) the greater of:
 
      (i) an amount equal to (x) $2.244 billion, increased or decreased, as
    appropriate, to reflect: (A) Steel Net Income from the close of business
    on December 31, 1990, (B) any dividends or other distributions declared
    or paid with respect to, or repurchases or issuances of, any shares of
    common stock of USX after December 31, 1990 and prior to the close of
    business on May 6, 1991 attributed to the U.S. Steel Group, (C) any
    dividends or other distributions declared or paid with respect to, or
    repurchases or issuances of, any shares of Steel Stock or any shares of
    Preferred Stock attributed to the U.S. Steel Group and (D) any other
    adjustments to stockholders' equity of the U.S. Steel Group made in
    accordance with generally accepted accounting principles, less (y) the
    sum of the aggregate par value of all outstanding Steel Stock and the
    aggregate stated capital of all outstanding Preferred Stock attributed
    to the U.S. Steel Group; and
 
      (ii) the excess of the fair market value of the net assets of the U.S.
    Steel Group over the sum of the aggregate par value of all outstanding
    Steel Stock and the aggregate stated capital of all outstanding
    Preferred Stock attributed to the U.S. Steel Group,
 
    in the case of each of clauses (i) and (ii) increased by an amount equal
    to any effects of the recognition of the transition obligation upon the
    adoption of SFAS No. 106 (including any amendments thereto) and any
    cumulative effects of the adoption of SFAS No. 109 (including any
    amendments thereto) in the year of adoption; or
 
    (b) in case there shall be no such amount, an amount equal to Steel Net
  Income (if positive) for the fiscal year in which the dividend is declared
  and/or the preceding fiscal year.
 
  The amount of $2.244 billion in clause (a)(i) above represents the amount of
total stockholders' equity of USX as of December 31, 1990 assigned to the U.S.
Steel Group by the Board after giving consideration to the historical debt and
equity structure of USX.
 
  The Available Steel Dividend Amount as of September 30, 1993 was at least
$1.837 billion, as calculated under the preceding clause (a)(i).
 
  Although net income and stockholders' equity of the U.S. Steel Group was
reduced when USX adopted the accounting changes required by SFAS No. 106 and
SFAS No. 109, such changes did not affect cash flows of the U.S. Steel Group.
As a result, in order to preclude dividends on the Steel Stock from being
limited by such noncash accounting changes, the amounts in each of clause
(a)(i) and clause (a)(ii) of the definition of "Available Steel Dividend
Amount" were adjusted to eliminate the effects of such changes, as set forth
above.
 
                                       21
<PAGE>
 
  Clause (b) in the definition of "Available Steel Dividend Amount" will permit
the payment of dividends on the Steel Stock in any fiscal year to the extent
there is positive Steel Net Income in such fiscal year or in the preceding
fiscal year or to the extent of the sum of positive Steel Net Income, if any,
in both such years. Any loss in either such year would not reduce positive
Steel Net Income, if any, in the other year for purposes of determining the
applicable limitation on dividends. Such provision is comparable to Section 170
of the Delaware General Corporation Law, which allows the payment of dividends
on common stock of any Delaware corporation in any fiscal year to the extent of
consolidated net income of the corporation for such fiscal year and/or the
preceding fiscal year.
 
  As used herein, "Steel Net Income" means the net income or loss of the U.S.
Steel Group determined in accordance with generally accepted accounting
principles, including income and expenses of USX attributed to the U.S. Steel
Group, on a substantially consistent basis, including, without limitation,
corporate administrative costs, net interest and other financial costs and
income taxes. For information concerning the policies governing the attribution
of corporate activities to the U.S. Steel Group which are being followed by USX
in determining Steel Net Income, see "Management and Accounting Policies."
 
  The Board may, in its sole discretion, declare and pay dividends exclusively
on the Marathon Stock, exclusively on the Steel Stock, exclusively on the Delhi
Stock or on such classes in equal or unequal amounts, notwithstanding the
respective amount of funds available for dividends on each class, the
respective voting and liquidation rights of each class, the amount or prior
dividends declared on each class or any other factor.
 
  EXCHANGE AND REDEMPTION--IN THE EVENT OF A DISPOSITION OF ALL OR
SUBSTANTIALLY ALL OF THE ASSETS OF THE U.S. STEEL GROUP, USX IS REQUIRED TO (1)
PAY A DIVIDEND, (2) REDEEM STEEL STOCK OR (3) EXCHANGE STEEL STOCK FOR MARATHON
STOCK OR, IF THERE ARE NO SHARES OF MARATHON STOCK OUTSTANDING, DELHI STOCK,
SUBJECT TO CERTAIN LIMITATIONS.
 
  If USX transfers all the assets and liabilities of the U.S. Steel Group to a
wholly owned subsidiary of USX (the "U.S. Steel Group Subsidiary"), Steel Stock
may be exchanged, at the sole discretion of the Board, by a majority vote of
the directors then in office, provided that there are funds of USX legally
available therefor, for all of the outstanding stock of the U.S. Steel Group
Subsidiary, on a pro rata basis on the same terms and conditions as on the
Marathon Stock.
 
  In addition, upon the Disposition, in one transaction or a series of related
transactions, of all or substantially all of the properties and assets of the
U.S. Steel Group (other than in connection with the Disposition by USX of all
of its properties and assets in one transaction) to any person, entity or group
(other than to the holders of all outstanding shares of Steel Stock on a pro
rata basis or to a person, entity or group in which USX, directly or
indirectly, owns a majority equity interest), USX shall, within 60 days
following the consummation of such Disposition, either (i) subject to the
limitations on dividends on Steel Stock set forth above, declare and pay a
dividend in cash and/or in securities or other property received as proceeds of
such Disposition to the holders of the Steel Stock in an amount equal to the
Net Proceeds of such Disposition, (ii) to the extent that there are funds of
USX legally available therefor, redeem the number of whole shares of Steel
Stock having an aggregate average Market Value during the ten-Business Day
period following consummation of such Disposition, closest to the value of the
Net Proceeds of such Disposition, for cash and/or securities or other property
received as proceeds of such Disposition in an amount equal to the Net Proceeds
or (iii) exchange each outstanding share of Steel Stock for a number of shares
of Marathon Stock or, if there are no shares of Marathon Stock outstanding and
shares of Delhi Stock are outstanding, of Delhi Stock, equal to 110% of the
average daily ratio (calculated to the nearest five decimal places) of the
Market Value of one share of Steel Stock to the Market Value of one share of
Marathon Stock or one share of Delhi Stock, as the case may be, during such
period.
 
  If, immediately after any event, USX, directly or indirectly, owns less than
a majority equity interest in any person, entity or group in which USX,
directly or indirectly, owned a majority equity interest immediately prior to
the occurrence of such event, a Disposition of all of the properties and assets
of the U.S. Steel Group owned by such person, entity or group shall be deemed
to have occurred. In the case of a Disposition of properties or assets in a
series of related transactions, such Disposition shall not be deemed to have
been consummated until the consummation of the last of such transactions.
 
                                       22
<PAGE>
 
  "Substantially all of the properties and assets of the U.S. Steel Group," as
of any date, means a portion of such properties and assets that represents at
least 80% of either of the then-current market value of, or the aggregate
revenues for the immediately preceding twelve fiscal quarterly periods of USX
derived from, the properties and assets of the U.S. Steel Group as of such date
(excluding the assets and properties of any person, entity or group in which
USX, directly or indirectly, owns less than a majority equity interest).
 
  After any such special dividend or redemption pursuant to clause (i) or (ii)
in the third preceding paragraph, the Board may, by a majority vote of the
directors then in office, exchange each outstanding share of Steel Stock for a
number of shares of Marathon Stock or, if there are no shares of Marathon Stock
outstanding and shares of Delhi Stock are outstanding, of Delhi Stock, equal to
110% of the Market Value Ratio as of the fifth Business Day prior to the date
notice of such exchange is mailed to the holders of Steel Stock. For purposes
of the preceding sentence, "Market Value Ratio", as of any date, means the
highest of the following (calculated to the nearest five decimal places): (A)
the average ratio of S/X for the five-Business Day period ending on such date.
(B) the quotient of (1) the sum of (w) four times the average ratio of S/X for
the five-Business Day period ending on such date, (x) three times the average
ratio of S/X for the next preceding five-Business Day period, (y) two times the
average ratio of S/X for the next preceding five-Business Day period and (z)
the average ratio of S/X for the next preceding five-Business Day period,
divided by (2) ten and (C) if the special dividend pursuant to clause (i) of
the third preceding paragraph was declared and paid or the redemption pursuant
to clause (ii) thereof was made prior to the commencement of the most recently
completed fiscal quarter of USX, the average ratio of S/X for such fiscal
quarter, where S is the Market Value of one share of the Steel Stock and X is
the Market Value of one share of the Marathon Stock or one share of Delhi
Stock, as the case may be. In determining whether to effect such an exchange,
the Board, in addition to other matters, would likely consider whether the
remaining properties and assets of the U.S. Steel Group constitute a viable
business. Other considerations could include the number of shares of Steel
Stock remaining outstanding following any such redemption, the per share market
price of the Steel Stock following the payment of such a dividend or such a
redemption and the cost of maintaining stockholder accounts.
 
  An exchange or redemption of Steel Stock for Marathon Stock or Delhi Stock,
as the case may be, would be made on the same general terms and conditions as
described above under "Marathon Stock--Exchange and Redemption--General
Provisions."
 
  VOTING--SHARES OF STEEL STOCK WILL, WHEN VOTING TOGETHER WITH ALL OTHER
CLASSES OF COMMON STOCK, HAVE A NUMBER OF VOTES PER SHARE BASED UPON TIME-
WEIGHTED AVERAGE RATIOS OF THE MARKET VALUE OF A SHARE OF STEEL STOCK TO THE
MARKET VALUE OF A SHARE OF MARATHON STOCK.
 
  The holders of shares of the Steel Stock have the voting rights described
above under the caption "Marathon Stock--Voting."
 
  In addition, as is the case with the use of the proceeds from the Disposition
of any properties or assets of the Marathon Group or the Delhi Group, unless
the vote or consent of a greater number of shares shall then be required by
law, the approval of the holders of at least 66 2/3% of the outstanding Steel
Stock, voting as a separate class, shall be necessary for:
 
    (i) the declaration or payment of any dividend on, or the making of any
  other payment or distribution on or with respect to, any shares of any
  other class of common stock, if such dividend, payment or distribution is
  to be made with (A) proceeds from the Disposition of any of the properties
  and assets of the U.S. Steel Group or (B) any portion of an equity interest
  in a person, entity or group that owns any of the properties and assets of
  the U.S. Steel Group; or
 
    (ii) the use, or reservation for use, of any proceeds from the
  Disposition of any of the properties and assets of the U.S. Steel Group, or
  any of the properties and assets acquired with such proceeds, in any
  business of USX other than a business of the U.S. Steel Group.
  Notwithstanding the foregoing, however, such vote shall not be required if
  such proceeds are loaned at a rate or rates representative of actual
  borrowings and short-term investments by USX.
 
 
                                       23
<PAGE>
 
  LIQUIDATION--IN THE EVENT OF THE LIQUIDATION OF USX, HOLDERS OF STEEL STOCK
WILL BE ENTITLED TO RECEIVE A PORTION OF THE FUNDS DISTRIBUTABLE TO HOLDERS OF
COMMON STOCK BASED ON THE RELATIVE TIME-WEIGHTED AVERAGE AGGREGATE MARKET
CAPITALIZATION OF THE STEEL STOCK TO THE AGGREGATE MARKET CAPITALIZATION OF ALL
CLASSES OF COMMON STOCK.
 
  In the event of a dissolution, liquidation or winding-up of USX, the holders
of shares of Steel Stock are entitled to receive funds in the amounts described
above under "Marathon Stock--Liquidation."
 
DELHI STOCK
 
  DIVIDENDS--DIVIDENDS ON THE DELHI STOCK ARE INTENDED TO BE PAID BASED UPON
THE FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF THE DELHI GROUP.
   
  Subject to any prior rights of the holders of the Preferred Stock, dividends
on the Delhi Stock may be declared and paid only out of the lesser of (i) funds
of USX legally available therefor and (ii) the Available Delhi Dividend Amount.
    
  The "Available Delhi Dividend Amount," on any date, means the product of the
Delhi Fraction and either:
 
    (a) the greater of:
 
      (i) an amount equal to (X) $172.9 million, increased or decreased, as
    appropriate, to reflect, from June 30, 1992, (A) Delhi Net Income, (B)
    any dividends or other distributions declared or paid with respect to,
    or repurchases or issuances of, any shares of Marathon Stock prior to
    the close of business on October 2, 1992 attributed to the Delhi Group,
    (C) any dividends or other distributions declared or paid with respect
    to, or repurchases or issuances of, any shares of Delhi Stock or any
    shares of Preferred Stock attributed to the Delhi Group, (D) assets or
    properties of the Delhi Group that are no longer included as part of the
    Delhi Group as a result of any such dividend, distribution or repurchase
    pursuant to the proviso to the definition of "Delhi Group" set forth
    above and (E) any other adjustments to stockholders' equity of the Delhi
    Group made in accordance with generally accepted accounting principles
    less (Y) the sum of the aggregate stated capital of all outstanding
    Preferred Stock attributed to the Delhi Group and the quotient of the
    aggregate par value of all outstanding Delhi Stock divided by the Delhi
    Fraction; and
 
      (ii) the excess of the fair market value of the net assets of the
    Delhi Group over the sum of the aggregate stated capital of all
    outstanding Preferred Stock attributed to the Delhi Group, and the
    quotient of the aggregate par value of all outstanding Delhi Stock
    divided by the Delhi Fraction; or
 
    (b) in case there shall be no such amount, an amount equal to Delhi Net
  Income (if positive) for the fiscal year in which the dividend is declared
  and/or the preceding fiscal year.
 
  The amount of $172.9 million in clause (a) (i) above represents the amount of
the stockholders' equity of USX as of June 30, 1992 attributable to the Delhi
Group based upon a capital structure that reflects attribution to the Delhi
Group of a total amount of $128.0 million of debt, as determined by the Board
pursuant to the Certificate of Incorporation.
 
  The Available Delhi Dividend Amount as of September 30, 1993 was at least
$121.6 million, as calculated under the preceding clause (a) (i).
 
  "Delhi Net Income" means the net income or loss of the Delhi Group determined
in accordance with generally accepted accounting principles, including income
and expenses of USX attributed to the Delhi Group on a substantially consistent
basis, including, without limitation, corporate administrative costs, net
interest and other financial costs and income taxes. For information concerning
the policies governing the attribution of corporate activities to the Delhi
Group which will be followed by USX in determining Delhi Net Income, see
"Management and Accounting Policies."
 
  Clause (b) in the definition of "Available Delhi Dividend Amount" will permit
the payment of dividends on the Delhi Stock in any fiscal year to the extent
there is positive Delhi Net Income in such fiscal year or in the preceding
fiscal year or to the extent of the sum of positive Delhi Net Income, if any,
in both such years. Any loss in either such year would not reduce positive
Delhi Net Income, if any, in the other year for purposes of
 
                                       24
<PAGE>
 
determining the applicable limitation on dividends. Such provision is
comparable to Section 170 of the Delaware General Corporation Law, which is
applicable to the Delhi Stock, and which allows the payment of dividends on
common stock of any Delaware corporation in any fiscal year to the extent of
consolidated net income of the corporation for such fiscal year and/or the
preceding fiscal year.
 
  The Board may, in its sole discretion, declare and pay dividends exclusively
on the Marathon Stock, exclusively on the Steel Stock, exclusively on the Delhi
Stock or on such classes in equal or unequal amounts, notwithstanding the
respective amount of funds available for dividends on each class, the
respective voting and liquidation rights of each class, the amount or prior
dividends declared on each class or any other factor.
 
  EXCHANGE AND REDEMPTION--IN THE EVENT OF A DISPOSITION OF ALL OR
SUBSTANTIALLY ALL OF THE ASSETS OF THE DELHI GROUP, USX IS REQUIRED TO (1) PAY
A DIVIDEND, (2) REDEEM DELHI STOCK OR (3) EXCHANGE DELHI STOCK FOR MARATHON
STOCK OR, IF THERE ARE NO SHARES OF MARATHON STOCK OUTSTANDING, STEEL STOCK,
SUBJECT TO CERTAIN LIMITATIONS. ALSO, THE BOARD MAY REQUIRE THAT THE DELHI
STOCK BE EXCHANGED FOR MARATHON STOCK, OR IF THERE ARE NO SHARES OF MARATHON
STOCK OUTSTANDING, STEEL STOCK, IN CERTAIN CIRCUMSTANCES.
 
  If USX transfers all of the assets and liabilities of the Delhi Group to a
wholly owned subsidiary of USX (the "Delhi Group Subsidiary"), the Delhi Stock
may be exchanged, at the sole discretion of the Board, by a majority vote of
the directors then in office, provided that there are funds of USX legally
available therefor, for a number of shares of common stock of the Delhi Group
Subsidiary equal to the product of the Delhi Fraction and the number of all
outstanding shares of the Delhi Group Subsidiary, on a pro rata basis. USX
would retain the balance of the outstanding shares of common stock of the Delhi
Group Subsidiary if the Delhi Fraction were less than one, which balance would
be attributed to the Marathon Group.
 
  In addition, upon the Disposition, in one transaction or a series of related
transactions, of all or substantially all of the properties and assets of the
Delhi Group (other than in connection with the Disposition by USX of all of its
properties or assets in one transaction) to any person, entity or group (other
than to the holders of all outstanding shares of Delhi Stock on a pro rata
basis or to any person, entity or group in which USX, directly or indirectly,
owns a majority equity interest), USX shall, within 60 days following the
consummation of such Disposition, either (i) subject to the limitations on
dividends on Delhi Stock set forth under "Dividends" above, declare and pay a
dividend in cash and/or in securities or other property received as proceeds of
such Disposition to the holders of Delhi Stock in an amount equal to the
product of the Delhi Fraction and the Net Proceeds of such Disposition, (ii) to
the extent that there are funds of USX legally available therefor, redeem the
number of whole shares of Delhi Stock that has an aggregate average Market
Value, during a specified period, closest to the value of the product of the
Delhi Fraction and the Net Proceeds of such Disposition, for cash and/or
securities or other property received as proceeds of such Disposition in an
amount equal to such product or (iii) exchange each outstanding share of Delhi
Stock for a number of shares of Marathon Stock, or if there are no shares of
Marathon Stock outstanding and shares of Steel Stock are outstanding, of Steel
Stock, equal to 110% of the average daily ratio (calculated to the nearest five
decimal places) of the Market Value of one share of Marathon Stock or one share
of Steel Stock, as the case may be, during such period.
 
  If, immediately after any event, USX, directly or indirectly, owns less than
a majority equity interest in any person, entity or group in which USX,
directly or indirectly, owned a majority equity interest immediately prior to
the occurrence of such event, a Disposition of all of the properties and assets
of the Delhi Group owned by such person shall be deemed to have occurred. In
the case of a Disposition of properties or assets in a series of related
transactions, such Disposition shall not be deemed to have been consummated
until the consummation of the last of such transactions.
 
  "Substantially all of the properties and assets of the Delhi Group," as of
any date, means a portion of such properties and assets that represents at
least 80% of either of the then-current market value of, or the aggregate
revenues for the immediately preceding twelve fiscal quarterly periods of USX
derived from, the properties and assets of the Delhi Group as of such date
(excluding the assets and properties of any person, entity or group in which
USX, directly or indirectly, owns less than a majority equity interest).
 
                                       25
<PAGE>
 
  After any such special dividend or redemption pursuant to clause (i) or (ii)
in the third preceding paragraph, the Board may, by a majority vote of the
directors then in office, exchange each outstanding share of Delhi Stock for a
number of shares of Marathon Stock or, if there are no shares of Marathon Stock
outstanding and shares of Steel Stock are outstanding, of Steel Stock, equal to
110% of the Market Value Ratio as of the fifth Business Day prior to the date
notice of such exchange is mailed to the holders of Delhi Stock. In determining
whether to effect such an exchange, the Board, in addition to other matters,
would likely consider whether the remaining properties and assets of the Delhi
Group constitute a viable business. Other considerations could include the
number of shares of Delhi Stock remaining outstanding following any such
redemption, the per share market price of the Delhi Stock following the payment
of such a dividend or such a redemption and the cost of maintaining stockholder
accounts.
 
  In addition, the Board may, by a majority vote of the directors then in
office, at any time exchange each outstanding share of Delhi Stock for a number
of shares of Marathon Stock or, if there are no shares of Marathon Stock
outstanding and shares of Steel Stock are outstanding, of Steel Stock, equal to
115% of the Market Value Ratio as of the fifth Business Day prior to the date
such notice is mailed to the holders of Delhi Stock.
 
  For purposes of the two preceding paragraphs, "Market Value Ratio," as of any
date, means the highest of the following (calculated to the nearest five
decimal places): (A) the average ratio of D/X for the five-Business Day period
ending on such date, (B) the quotient of (1) the sum of (w) four times the
average ratio of D/X for the five-Business Day period ending on such date, (x)
three times the average ratio of D/X for the next preceding five-Business Day
period, (y) two times the average ratio of D/X for the next preceding five-
Business Day period and (z) the average ratio of D/X for the next preceding
five-Business Day period, divided by (2) ten and (C) if the special dividend
pursuant to clause (i) of the seventh preceding paragraph was declared and paid
or the redemption pursuant to clause (ii) thereof was made prior to the
commencement of the most recently completed fiscal quarter of USX, the average
ratio of D/X for such fiscal quarter, where D is the Market Value of one share
of the Delhi Stock and X is the Market Value of one share of the Marathon Stock
or Steel Stock, as the case may be.
 
  An exchange or redemption of Delhi Stock for Marathon Stock or Steel Stock,
as the case may be, would be made on the same general terms and conditions as
described above under "Marathon Stock--Exchange and Redemption--General
Provisions."
 
  VOTING--SHARES OF DELHI STOCK WILL, WHEN VOTING TOGETHER WITH ALL OTHER
CLASSES OF COMMON STOCK, HAVE A NUMBER OF VOTES PER SHARE BASED UPON TIME-
WEIGHTED AVERAGE RATIOS OF THE MARKET VALUE OF A SHARE OF DELHI STOCK TO THE
MARKET VALUE OF A SHARE OF MARATHON STOCK.
 
  The holders of shares of the Delhi Stock have the voting rights described
above under the caption "Marathon Stock--Voting."
 
  In addition, as is the case with the use of the proceeds from the Disposition
of any properties or assets of the Marathon Group or the U.S. Steel Group, the
approval of the holders of at least 66 2/3% of the outstanding Delhi Stock,
voting as a separate class, shall be necessary for:
 
    (i) the declaration or payment of any dividend on, or the making of any
  other payment or distribution on or with respect to, any shares of any
  other class of Common Stock, if such dividend, payment or distribution is
  to be made with (A) proceeds from the Disposition of any of the properties
  and assets of the Delhi Group or (B) any portion of an equity interest in a
  person, entity or group that owns any of the properties and assets of the
  Delhi Group; or
 
    (ii) the use, or reservation for use, of any proceeds from the
  Disposition of any of the properties and assets of the Delhi Group, or any
  of the properties and assets acquired with such proceeds, in any business
  of USX other than a business of the Delhi Group. Notwithstanding the
  foregoing, however, such vote shall not be required if such proceeds are
  loaned at a rate or rates representative of actual borrowings and short-
  term investments by USX.
 
                                       26
<PAGE>
 
  LIQUIDATION--IN THE EVENT OF THE LIQUIDATION OF USX, HOLDERS OF DELHI STOCK
WILL BE ENTITLED TO RECEIVE A PORTION OF THE FUNDS DISTRIBUTABLE TO HOLDERS OF
COMMON STOCK BASED ON THE RELATIVE TIME-WEIGHTED AVERAGE AGGREGATE MARKET
CAPITALIZATION OF THE DELHI STOCK TO THE AGGREGATE MARKET CAPITALIZATION OF ALL
CLASSES OF COMMON STOCK.
 
  In the event of a dissolution, liquidation or winding-up of USX, the holders
of shares of Delhi Stock are entitled to receive funds in the amounts described
above under "Marathon Stock--Liquidation."
 
 Retained Interest of the Marathon Group
 
  Prior to October 2, 1992, all of the businesses that constituted the Delhi
Group were part of the Marathon Group and their results of operations and
financial condition were reflected in their entirety in the financial
statements of the Marathon Group. As of that date, these businesses ceased to
be included in the Marathon Group. Their results of operations and financial
condition were reflected in the financial statements of the Delhi Group and
ceased to be reflected in the financial statements of the Marathon Group,
except to the extent of any Retained Interest, as described below, and as
appropriate in accordance with generally accepted accounting principles.
 
  In connection with the establishment of the Delhi Group and the initial
public offering of Delhi Stock, the Board designated 14,000,000 shares of Delhi
Stock as the total number of shares of Delhi Stock which it deemed to represent
100% of the common stockholders' equity value of USX attributable to the Delhi
Group, all of which were attributed to the Marathon Group. This number was
established by taking into account, among other factors, the initial level of
USX debt and equity capitalization to be assigned to the Delhi Group, Delhi's
recent historical unleveraged financial performance relative to its competitors
that are publicly traded and the state of the markets for public offerings and
other stock transactions.
 
  Since the 9,000,000 shares of Delhi Stock sold in the initial public offering
represented less than the entire equity value of USX attributable to the Delhi
Group, the Marathon Group has been deemed to have a Retained Interest in the
business, assets and liabilities of the Delhi Group equal to the balance of
such equity value (deemed to be represented by 5,000,000 shares at the time of
the initial public offering). As of December 9, 1993, an additional 184,058
shares of Delhi Stock deemed to represent part of the Retained Interest had
been issued in connection with certain employee benefit plans. This reduced the
number of shares deemed to represent the Retained Interest to 4,815,942 and
increased the number of shares outstanding to 9,184,058. In addition, 3,000
shares representing an additional equity interest in the Delhi Group were
issued in connection with employee stock grants, increasing the number of
shares outstanding at December 9, 1993 to 9,187,058.
 
  The 35,997,000 authorized shares of Delhi Stock in excess of the total of the
shares outstanding and the shares deemed to represent the Retained Interest are
available for issuance as additional equity for the Delhi Group. Authorized but
unissued shares may be issued without approval of the holders of Delhi Stock
and may be issued in the future at prices which could dilute the equity
interest of existing holders of Delhi Stock at that time. See "Special
Considerations--Considerations Relating to Common Stock--No Rights or
Additional Duties with Respect to the Groups; Potential Conflicts" and
"Description of Capital Stock--Delhi Stock--Dividends."
 
  On September 9, 1993, USX filed a registration statement with the Commission
with respect to the sale of up to 5 million shares of Delhi Stock, including
all shares representing the Retained Interest. That offering was postponed in
December 1993 due to market conditions.
 
DETERMINATIONS BY BOARD
 
  Any determinations made by the Board under the foregoing provisions will be
final and binding on all stockholders of USX.
 
OTHER RIGHTS
 
  The holders of Common Stock do not have any preemptive rights or any rights
to convert their shares into any other securities of USX.
 
                                       27
<PAGE>
 
STOCK TRANSFER AGENT AND REGISTRAR
 
  USX maintains its own stock transfer department at the following address: USX
Corporation, Shareholders Services Department, 600 Grant Street, Room 611,
Pittsburgh, PA 15219-4776. Certificates representing shares can also be
presented for registration of transfer at Chemical Bank, 55 Water Street, New
York, New York.
 
  Mellon Bank, N.A., One Mellon Bank Center, Pittsburgh, PA 15258 is the
Registrar for all the Common Stock.
 
AMENDED AND RESTATED RIGHTS PLAN
 
  The following is a brief description of the terms of the Stockholders Rights
Plan set forth in the Restated Rights Agreement between USX and the Rights
Agent.
 
  Under the Restated Rights Agreement, the right (each a "Right") to purchase
from USX a unit consisting of one one-hundredth of a share (a "Unit") of Series
A Junior Preferred Stock, no par value (the "Junior Preferred Stock"), at a
purchase price of $120 in cash per Unit, subject to adjustment, is attached to
each share of Marathon Stock, Steel Stock and Delhi Stock (sometimes
hereinafter referred to together as the "Voting Stock"). A Right attached to a
share of Marathon Stock is hereinafter referred to as a "Marathon Right," a
Right attached to a share of Steel Stock is hereinafter referred to as a "Steel
Right" and a Right attached to a share of Delhi Stock is hereinafter referred
to as a "Delhi Right."
 
  The Rights will separate from the Voting Stock and a Rights distribution date
will occur upon the earlier of (i) 15 days following a public announcement that
a person or group of affiliated or associated persons (an "Acquiring Person")
has acquired (except pursuant to a Qualifying Offer (defined in the Restated
Rights Agreement as an all-cash tender offer for all outstanding shares of
Voting Stock meeting certain prescribed requirements)), or obtained the right
to acquire, beneficial ownership of Voting Stock representing 15% or more of
the total voting power of all outstanding shares of Voting Stock (the "Stock
Acquisition Date"), or (ii) 15 days (or upon such later date as may be
determined by the Board) following the commencement of a tender offer or
exchange offer (other than a Qualifying Offer) that would result in a person or
a group beneficially owning Voting Stock representing 15% or more of the total
voting power of all outstanding shares of Voting Stock. For purposes of the
Restated Rights Agreement, total voting power of Voting Stock shall be
determined based upon the most recent calculation announced by USX. See
"Marathon Stock--Voting," "Steel Stock--Voting" and "Delhi Stock--Voting"
above. If a person inadvertently becomes the beneficial owner of Voting Stock
representing 15% or more of the total voting power of the Voting Stock due to
the recalculation by USX of the relative voting power of Marathon Stock, Steel
Stock and Delhi Stock, such person will not be an Acquiring Person unless and
until such person acquires any additional shares of Voting Stock.
 
  In the event that a person or group becomes the beneficial owner of Voting
Stock representing 15% or more of the total voting power of all outstanding
shares of Voting Stock (except pursuant to a Qualifying Offer), the Rights
"flip-in" and entitle each holder of a Right (other than the Acquiring Person
and certain related parties) to receive, upon exercise, Marathon Stock, Steel
Stock or Delhi Stock, as the case may be (or in certain circumstances, cash,
property, or other securities of USX), having a value equal to two times the
exercise price of the Marathon Right, Steel Right or Delhi Right, respectively.
However, Rights are not exercisable until such time as the Rights are no longer
redeemable by USX as set forth below.
 
  In the event that, any time following the Stock Acquisition Date, (i) USX is
acquired in a merger or other business combination transaction in which USX is
not the surviving corporation (other than a merger that follows a Qualifying
Offer) or its Voting Stock is changed or exchanged, or (ii) 50% or more of
USX's assets, earning power or cash flow is sold or transferred, the Rights
"flip-over" and entitle each holder of a Right (other than an Acquiring Person
and certain related parties) to receive, upon exercise, common stock of the
acquiring company having a value equal to two times the exercise price of the
Right.
 
  At any time until 15 days following the Stock Acquisition Date (subject to
extension), USX may redeem the Rights in whole, but not in part, at a price of
$.01 per whole Right payable in stock or cash or any other form of
consideration deemed appropriate by the Board (the "Redemption Price").
Immediately upon the action of the Board ordering redemption of the Rights, the
Rights will terminate and the only right of the holders of the Rights will be
to receive the Redemption Price.
 
                                       28
<PAGE>
 
  The Board may, at its option, at any time after any person becomes an
Acquiring Person, exchange all or part of the outstanding and exercisable
Marathon Rights, Steel Rights and Delhi Rights (other than Rights held by the
Acquiring Person and certain related parties) for shares of Marathon Stock,
Steel Stock and Delhi Stock, respectively, at an exchange ratio of one share of
Marathon Stock for each Marathon Right, one share of Steel Stock for each Steel
Right and one share of Delhi Stock for each Delhi Right (subject to certain
anti-dilution adjustments). However, the Board may not effect such an exchange
at any time any person or group owns Voting Stock representing 50% or more of
the total voting power of the Voting Stock then outstanding.
 
  As long as the Rights are attached to shares of Voting Stock, USX will issue
Marathon Rights on each share of Marathon Stock, Steel Rights on each share of
Steel Stock and Delhi Rights on each share of Delhi Stock issued prior to the
Rights distribution date so that all such shares will have attached Rights.
 
  A copy of the Restated Rights Agreement is available free of charge from the
Rights Agent.
 
                              PLAN OF DISTRIBUTION
 
  USX may sell the Offered Securities to or through underwriters or directly to
purchasers, agents or dealers or through brokers.
 
  Offers to purchase Offered Securities may be solicited directly by USX or
brokers or dealers designated by USX from time to time. Any such broker or
dealer may be deemed to be an underwriter as that term is defined in the
Securities Act, and will be named in the Prospectus Supplement, together with
the compensation payable thereto by USX in connection with the sale of the
Offered Securities.
 
  Underwriters, agents, brokers and dealers may be entitled under agreements
which may be entered into with USX to indemnification by USX against certain
civil liabilities, including liabilities under the Securities Act. Such
underwriters, agents, brokers and dealers may engage in transactions with, or
perform services for, USX in the ordinary course of business.
 
  The place and time of delivery for the Offered Securities in respect of which
this Prospectus is delivered will be set forth in the accompanying Prospectus
Supplement.
 
                             VALIDITY OF SECURITIES
 
  The validity of the issuance of the Offered Securities will be passed upon
for USX by D. D. Sandman, Esq., General Counsel and Secretary of USX or by J.A.
Hammerschmidt, Esq., Assistant General Counsel of USX. Messrs. Sandman and
Hammerschmidt in their respective capacities as General Counsel and Secretary,
and Assistant General Counsel are paid salaries by USX and participate in
various employee benefit plans offered to officers of USX generally.
 
                                    EXPERTS
 
  The consolidated financial statements of USX, the financial statements of the
Marathon Group, the financial statements of the U.S. Steel Group and the
financial statements of the Delhi Group as of December 31, 1992 and 1991 and
for each of the three years in the period ended December 31, 1992, incorporated
in this Prospectus by reference to USX's Annual Report on Form 10-K for the
year ended December 31,1992, have been so incorporated in reliance on the
reports (the report pertaining to the U.S. Steel Group financial statements
contains an explanatory paragraph referring to the U.S. Steel Group's
involvement in certain contingencies as described in Note 24 to the U.S. Steel
Group financial statements) of Price Waterhouse, independent accountants, given
on the authority of said firm as experts in auditing and accounting.
 
                                       29
<PAGE>
 
                                                                      APPENDIX I
                          SUMMARY OF USX COMMON STOCK
 
  The following summary is qualified in its entirety by the detailed
information appearing elsewhere in, or incorporated by reference in, this
Prospectus. Capitalized terms used in this summary have the respective meanings
ascribed to them elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                 USX COMMON STOCK
                 -------------------------------------------------------------------------------------
                      USX-MARATHON GROUP      USX-U.S. STEEL GROUP         USX-DELHI GROUP
                         COMMON STOCK             COMMON STOCK              COMMON STOCK
                      ------------------      --------------------         ---------------
<S>              <C>                          <C>                          <C>
BUSINESS:        Energy business.             Steel and other businesses.  Gas gathering and
                                                                           processing business.
NUMBER OF        286,581,539                  70,289,545                   9,187,058
 SHARES
 OUTSTANDING AS
 OF
 DECEMBER 9,
 1993:
VOTING RIGHTS:   Except as otherwise          Except as otherwise          Except as otherwise
                 described herein, the        described herein, the Steel  described herein, the Delhi
                 Marathon Stock will vote as  Stock will vote as a single  Stock will vote as a single
                 a single class with the      class with the Marathon      class with the Marathon
                 Steel Stock and the Delhi    Stock and the Delhi Stock.   Stock and the Steel Stock.
                 Stock. The Marathon Stock    Each share of Steel Stock    Each share of Delhi Stock
                 will have one vote per       will have a variable number  will have a variable number
                 share.                       of votes based upon the      of votes based upon the
                                              relative Market Values of    relative Market Values of
                                              one share of Steel Stock     one share of Delhi Stock
                                              and one share of Marathon    and one share of Marathon
                                              Stock, and may have more     Stock, and may have more
                                              than, less than or exactly   than, less than or exactly
                                              one vote per share.          one vote per share.
DIVIDENDS:       Dividends on the Marathon    Dividends on the Steel       Dividends on the Delhi
                 Stock will be paid at the    Stock will be paid at the    Stock will be paid at the
                 discretion of the Board      discretion of the Board      discretion of the Board
                 based primarily upon the     based primarily upon the     based primarily upon the
                 long-term earnings and cash  long-term earnings and cash  long-term earnings and cash
                 flow capabilities of the     flow capabilities of the     flow capabilities of the
                 Marathon Group, as well as   U.S. Steel Group, as well    Delhi Group, as well as on
                 on the dividend policies of  as on the dividend policies  the dividend policies of
                 publicly traded energy       of publicly traded steel     similar publicly traded
                 companies. Dividends will    companies. Dividends will    companies. Dividends will
                 be payable out of all funds  be payable out of the        be payable out of the
                 of USX legally available     lesser of                    lesser of (i) all funds of
                 therefor.                    (i) all funds of USX         USX legally available
                                              legally available therefor   therefor and (ii) the
                                              and (ii) the Available       Available Delhi Dividend
                                              Steel Dividend Amount.       Amount.
EXCHANGE AND     USX may exchange the         USX may exchange the Steel   USX may exchange the Delhi
 REDEMPTION:     Marathon Stock for shares    Stock for shares of a        Stock for shares of a
                 of a wholly owned            wholly owned subsidiary      wholly owned subsidiary
                 subsidiary that holds all    that holds all the assets    that holds all the assets
                 the assets and liabilities   and liabilities of the U.S.  and liabilities of the
                 of the Marathon Group.       Steel Group.                 Delhi Group.
                                              If USX sells all or          If USX sells all or
                                              substantially all of the     substantially all of the
                                              properties and assets of     properties and assets of
                                              the U.S. Steel Group, USX    the Delhi Group, USX must
                                              must either:                 either; (i) pay a special
                                              (i) pay a special dividend   dividend to holders of
                                              to holders of Steel Stock    Delhi Stock equal to the
                                              equal to the Net Proceeds;   Net Proceeds; or (ii)
                                              or (ii) redeem shares of     redeem shares of Delhi
                                              Steel Stock having an        Stock having an aggregate
                                              aggregate Market Value       Market Value closest to the
                                              closest to the value of the  value of the Net Proceeds
                                              Net Proceeds for an amount   for an amount equal to the
                                              equal to the Net Proceeds;   Net Proceeds; or (iii)
                                              or                           exchange each share of
                                              (iii) exchange each share    Delhi Stock for a number of
                                              of Steel Stock for a number  shares of Marathon Stock
                                              of shares of Marathon Stock  or, if no Marathon Stock is
                                              equal to 110% of the ratio   outstanding, of Steel
                                              of the Market Values of one  Stock, equal to 110% of the
                                              share of Steel Stock to one  ratio of the Market Values
                                              share of Marathon Stock.     of one share of Delhi Stock
                                                                           to one share of Marathon
                                                                           Stock or one share of Steel
                                                                           Stock, as the case may be.
                                                                           The Board may, at any time,
                                                                           exchange each outstanding
                                                                           share of Delhi Stock for a
                                                                           number of shares of
                                                                           Marathon Stock or, if there
                                                                           are no shares of Marathon
                                                                           Stock outstanding, Steel
                                                                           Stock equal to 115% of the
                                                                           Market Value of one share
                                                                           of Delhi Stock to one share
                                                                           of Marathon Stock or one
                                                                           share of Steel Stock, as
                                                                           the case may be.
LIQUIDATION:     In the event of the          In the event of the          In the event of the
                 liquidation of USX, holders  liquidation of USX, holders  liquidation of USX, holders
                 of Marathon Stock will       of Steel Stock will share    of Delhi Stock will share
                 share the funds, if any,     the funds, if any,           funds, if any, remaining
                 remaining for distribution   remaining for distribution   for distribution to common
                 to common stockholders with  to common stockholders with  stockholders with holders
                 holders of Steel Stock and   holders of Marathon Stock    of Marathon Stock and Steel
                 Delhi Stock based upon the   and Delhi Stock based upon   Stock based upon the
                 relative market              the relative market          relative market
                 capitalizations of each.     capitalizations of each.     capitalizations of each.
LISTING:         NYSE under the symbol        NYSE under the symbol "X".   NYSE under the symbol
                 "MRO".                                                    "DGP".
</TABLE>
 
                                      A-1
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO PERSON IS AUTHORIZED TO GIVE INFORMATION OR TO MAKE ANY REPRESENTATIONS
OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH IN-
FORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES TO WHICH IT RELATES OR
AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY SECURITIES IN ANY
CIRCUMSTANCES IN WHICH SUCH AN OFFER OR SOLICITATION IS UNLAWFUL. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIR-
CUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AF-
FAIRS OF USX SINCE THE DATE OF THIS PROSPECTUS OR THAT THE INFORMATION CON-
TAINED OR INCORPORATED BY REFERENCE HEREIN IS CORRECT AS OF ANY TIME SINCE THE
DATE OF SUCH INFORMATION.
                                 ------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                          PAGE
                          ----
<S>                       <C>
Available Information...    2
Incorporation of Certain
 Documents
 by Reference...........    2
USX Corporation.........    3
Ratio of Earnings to
 Fixed Charges and Earn-
 ings to Combined Fixed
 Charges
 and Preferred Stock
 Dividends..............    3
Use of Proceeds.........    4
Special Considerations..    4
Management and
 Accounting Policies....    7
Description of the Debt
 Securities.............    8
Description of Capital
 Stock..................   15
Plan of Distribution....   29
Validity of Securities..   29
Experts.................   29
Appendix I--Summary of
 USX Common Stock.......  A-1
</TABLE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
     
                          [LOGO OF USX CORPORATION]

                                DEBT SECURITIES
 
                                PREFERRED STOCK
 
                        USX-MARATHON GROUP COMMON STOCK
 
                       USX-U.S. STEEL GROUP COMMON STOCK
 
                         USX-DELHI GROUP COMMON STOCK
                             ---------------------
 
                                  PROSPECTUS
                             ---------------------
 
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>
      <S>                                                              <C>
      Securities and Exchange Commission filing fee................... $293,104
      Costs of printing and engraving.................................   36,500
      Accounting fees and expenses....................................   15,000
      Miscellaneous expenses..........................................    5,396
                                                                       --------
          Total....................................................... $350,000
                                                                       ========
</TABLE>
- --------
*To be filed by Amendment
All of the foregoing expenses are estimated except for the Securities and
Exchange Commission filing fee.
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  Article V of USX's By Laws provides that USX shall indemnify to the fullest
extent permitted by law any person who is made or is threatened to be made a
party or is involved in any action, suit, or proceeding whether civil,
criminal, administrative or investigative by reason of the fact that he is or
was a director, officer, employee or agent of USX or was serving at the request
of USX as an officer, director, employee or agent of another corporation,
partnership, joint venture, enterprise, or nonprofit entity.
 
  USX is empowered by Section 145 of the Delaware General Corporation Law,
subject to the procedures and limitations stated therein, to indemnify any
person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative (other than an action by or in the
right of USX) by reason of the fact that such person is or was an officer,
employee, agent or director of USX, or is or was serving at the request of USX
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by such person in connection with such action, suit or proceeding if
he acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of USX, and, with respect to any criminal action
or proceeding, had no reasonable cause to believe his conduct was unlawful. USX
may indemnify any such person against expenses (including attorneys' fees) in
an action by or in the right of USX under the same conditions, except that no
indemnification is permitted without judicial approval if such person is
adjudged to be liable to USX. To the extent such person is successful on the
merits or otherwise in the defense of any action referred to above, USX must
indemnify him against the expenses which he actually and reasonably incurred in
connection therewith.
 
  Policies of insurance are maintained by USX under which directors and
officers of USX are insured, within the limits and subject to the limitations
of the policies, against certain expenses in connection with the defense of
actions, suits or proceedings, and certain liabilities which might be imposed
as a result of such actions, suits or proceedings, to which they are parties by
reason of being or having been such directors or officers.
 
  USX's Certificate of Incorporation provides that no director shall be
personally liable to USX or its stockholders for monetary damages for any
breach of fiduciary duty by such director as a director, except (i) for breach
of the director's duty of loyalty to USX or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) pursuant to Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit.
 
ITEM 16. LIST OF EXHIBITS.
 
  See Index to Exhibits.
 
                                      II-1
<PAGE>
 
ITEM 17. UNDERTAKINGS.
 
  (a) The undersigned registrant hereby undertakes:
 
    (1) To file, during any period in which offers or sales are being made, a
  post-effective amendment to this registration statement:
 
      (i) To include any prospectus required by section 10(a)(3) of the
    Securities Act of 1933;
 
      (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the registration statement (or the most recent
    post-effective amendment thereof) which, individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the registration statement;
 
      (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the registration statement or
    any material change to such information in the registration statement;
 
      Provided however; that paragraphs (a)(1)(i) and (a)(1)(ii) do not
    apply if the information required to be included in a post-effective
    amendment by those paragraphs is contained in periodic reports filed by
    the registrant pursuant to section 13 or section 15(d) of the Securities
    Exchange Act of 1934 that are incorporated by reference herein.
 
    (2) That, for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
    (3) To remove from registration by means of post-effective amendment any
  of the securities being registered which remain unsold at the termination
  of the offering.
 
  (b) USX hereby undertakes that, for purposes of determining any liability
under the Securities Act of 1933, each filing of USX's annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that
is incorporated by reference in this registration statement shall be deemed to
be a new registration statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
  (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
USX pursuant to the foregoing provisions or otherwise, USX has been advised
that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act of
1933 and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by USX of
expenses incurred or paid by a director, officer or controlling person of USX
in the successful defense of any action, suit or proceeding) is asserted by
such director, officer or controlling person in connection with the securities
being registered, USX will, unless in the opinion of its counsel the matter has
been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the
final adjudication of such issue.
 
                                      II-2
<PAGE>
 
                                   SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL OF THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS AMENDMENT
TO THE REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,
THEREUNTO DULY AUTHORIZED, IN THE CITY OF PITTSBURGH, COMMONWEALTH OF
PENNSYLVANIA, ON JANUARY 5, 1994.
 
                                        USX Corporation
                                        (Registrant)
 
                                                   /s/ Lewis B. Jones
                                        By .....................................
                                            Lewis B. Jones, Vice President &
                                                      Comptroller
 
Pittsburgh, Pennsylvania
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT, THIS AMENDMENT
TO THE REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED ON JANUARY 5, 1994.
 
             SIGNATURE                                 TITLE
 
 
                                        Chairman of the Board of Directors,
                                            Chief Executive Officer and
                                           Director (Principal Executive
                                                      Officer)
 
            *C. A. Corry
....................................
            C. A. CORRY
 
                                             Executive Vice President--
                                            Accounting & Finance & Chief
                                           Financial Officer and Director
                                           (Principal Financial Officer)
 
          *R. M. Hernandez
....................................
          R. M. HERNANDEZ
 
 
                                            Vice President & Comptroller
         /s/ Lewis B. Jones                (Principal Accounting Officer)
....................................
           LEWIS B. JONES
 
 
 
                                                      Director
....................................
         NEIL A. ARMSTRONG
 
 
 
         *Victor G. Beghini                           Director
....................................
         VICTOR G. BEGHINI
 
 
 
     *Jeanette Grasselli Brown                        Director
....................................
      JEANETTE GRASSELLI BROWN
 
 
 
           *John H. Filer                             Director
....................................
           JOHN H. FILER
 
 
 
         *James A. D. Geier                           Director
....................................
         JAMES A. D. GEIER
 
                                      II-3
<PAGE>
 
             SIGNATURE                                TITLE
 
 
 
 
          *Charles R. Lee                           Director
...................................
          CHARLES R. LEE
 
 
           *Paul E. Lego                            Director
...................................
           PAUL E. LEGO
 
 
 
       *John M McGillicuddy                         Director
...................................
       JOHN F. MCGILLICUDDY
 
 
 
         *John M. Richman                           Director
...................................
          JOHN M. RICHMAN
 
 
 
        *David M. Roderick                          Director
...................................
         DAVID M. RODERICK
 
 
 
         *Thomas J. Usher                           Director
...................................
          THOMAS J. USHER
 
 
 
         *David R. Whitwam                          Director
...................................
         DAVID R. WHITWAM
 
 
 
        *Douglas C. Yearley                         Director
...................................
        DOUGLAS C. YEARLEY
 
        /s/ Lewis B. Jones
*By ...............................
 LEWIS B. JONES, ATTORNEY-IN-FACT
 
                                      II-4
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                     SEQUENTIAL
 EXHIBIT                                                                PAGE
 NUMBER                                                                NUMBER
 -------                                                             ----------
 <C>     <S>                                                         <C>
   1.    Form of Underwriting Agreement. (Incorporated by
         Reference to Exhibit 1 to Registration Statement No. 33-
         60142.)                                                          *
   4.1   Restated Certificate of Incorporation of USX dated
         November 1, 1993. (Incorporated by reference to USX Form
         10-Q for the period ended September 30, 1993.)                   *
   4.2   By-laws of USX dated May 6, 1991. (Incorporated by
         reference to USX Form 10-Q for period ended March 31,
         1991.)                                                           *
   4.3   Indenture for Debt Securities with Form of Debt
         Securities. (Incorporated by Reference to Exhibit 4.1 to
         Registration Statement No. 33-60142.)                            *
   4.4   Amended and Restated Rights Agreement. (Incorporated by
         Reference to USX's Form 8 Amendment to Form 8-A Filed on
         May 6, 1991. File No. 1-5153.)                                   *
   5.    Opinion and consent of D. D. Sandman, Esq.
  12.    Computation of Ratio of Earnings to Fixed Charges and
         Earnings to Combined Fixed Charges and Preferred Stock
         Dividends.                                                       *
  23.1   Consent of Price Waterhouse.                                     *
  23.3   Consent of D. D. Sandman, Esq. (Included in Exhibit 5.)
  24.    Powers of Attorney.                                              *
  25.    Statement of eligibility of Trustee. (Incorporated by
         Reference to Exhibit 25 to Registration Statement No. 33-
         60142.)                                                          *
</TABLE>
 
 
 
 
- --------
 * Previously Filed


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