ORYX ENERGY CO
424B2, 1996-07-12
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
PROSPECTUS SUPPLEMENT
(To Prospectus dated October 17, 1995)
 
                                                                       [LOGO]
                                  $150,000,000
 
                              ORYX ENERGY COMPANY
                         8 3/8% NOTES DUE JULY 15, 2004
                    Interest payable January 15 and July 15
 
                            ------------------------
 
    The Notes may not be redeemed by the Company at any time prior to maturity.
 
    The Notes will be represented by global securities registered in the name of
the nominee of The Depository Trust Company (Depositary). Interests in the Notes
will  only be evidenced by, and transfers will only be effected through, records
maintained by the Depositary  and its participants. Except  as described in  the
accompanying Prospectus, securities in definitive form will not be issued.
 
                            ------------------------
 
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    SUPPLEMENT   OR    THE   PROSPECTUS.    ANY   REPRE-
                  SENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                UNDERWRITING
                                                 PRICE TO       DISCOUNTS AND     PROCEEDS TO
                                                 PUBLIC(1)       COMMISSIONS     COMPANY(1)(2)
<S>                                           <C>              <C>              <C>
Per Note....................................      99.74%            0.75%           98.99%
Total.......................................   $149,610,000      $1,125,000      $148,485,000
</TABLE>
 
(1) Plus accrued interest, if any, from July 17, 1996.
 
(2) Before deduction of expenses payable by the Company estimated at $200,000.
 
                            ------------------------
 
    The Notes are  being offered  by the  Underwriters, subject  to prior  sale,
when,  as and if issued to and accepted  by them, subject to approval of certain
legal matters  by counsel  for the  Underwriters. The  Underwriters reserve  the
right  to reject orders in whole or in  part. It is expected that the Notes will
be delivered in book-entry form on or about July 17, 1996 through the facilities
of The Depository Trust Company.
 
Chase Securities Inc.                                             UBS Securities
 
BA Securities, Inc.
             BZW Securities Inc.
                             NatWest Capital Markets Limited
                                                   Nesbitt Burns Securities Inc.
 
            THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JULY 11, 1996.
<PAGE>
    IN  CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE  OR MAINTAIN  THE MARKET PRICE  OF THE  NOTES AT  A
LEVEL  ABOVE  THAT  WHICH  MIGHT  OTHERWISE PREVAIL  IN  THE  OPEN  MARKET. SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                  THE COMPANY
 
    Oryx Energy Company (together with its consolidated subsidiaries, unless the
context otherwise requires, Company) engages in the oil and gas exploration  and
production  business. The  Company has a  strong base of  U.S. and international
reserves and production in the Gulf  of Mexico, the southwestern U.S., the  U.K.
North  Sea,  Ecuador  and Kazakstan.  It  also has  exploration  and development
projects in  the  above mentioned  areas  as  well as  exploration  projects  in
Australia and Algeria. The Company continues to pursue selective acquisitions of
producing  properties in areas in which it is currently operating with a view to
increasing current  production  volumes  and  cash  flow  from  operations.  The
Company's  business  in  the  United  States  is  conducted  through  Sun Energy
Partners, L.P.  (Partnership), of  which  the Company  is the  Managing  General
Partner and owns a 98 percent interest.
 
    The  Company was incorporated  in Delaware in  1971. The Company's principal
executive office is located at 13155 Noel Road, Dallas, Texas 75240-5067 and its
telephone number is (214) 715-4000.
 
                                USE OF PROCEEDS
 
    The Company intends  to use  the net  proceeds from  the sale  of the  Notes
offered  hereby,  estimated to  be approximately  $148.3 million  after offering
expenses, to refinance  debt outstanding  under the  Company's Revolving  Credit
Agreement, uncommitted lines of credit and commercial paper. These vehicles have
been  utilized  to refinance  $100  million of  the  Company's 9.30%  Notes that
matured in May 1996  and $35 million  of the Company's  6.05% Medium Term  Notes
that  matured in  February 1996.  The Company has  an additional  $12 million of
8.92% Medium  Term  Notes  that will  mature  in  the fourth  quarter  of  1996.
Borrowings to be refinanced with the net proceeds have a final maturity of up to
two  years, and  as of  June 30, 1996  had a  weighted average  interest rate of
6.21%. Pending application, the net proceeds will be used for working capital or
other general corporate purposes.
 
                              RECENT DEVELOPMENTS
 
    Oil and gas  revenues for  the 1996 second  quarter are  expected to  remain
relatively  flat in comparison to the  1996 first quarter. Production volumes of
crude oil and natural  gas for the 1996  second quarter remain at  approximately
the same level as the 1996 first quarter. There has been a favorable increase in
crude  oil prices in the 1996 second quarter  over the first quarter of 1996 but
this increase is partially  offset by small declines  in the natural gas  price.
Expenses,  however, are also expected to increase  in the 1996 second quarter as
compared to the 1996 first quarter  primarily due to increased production  taxes
and exploration costs.
 
                              DESCRIPTION OF NOTES
 
    The  following  description of  the particular  terms  of the  Notes offered
hereby supplements,  and  to the  extent  inconsistent therewith  replaces,  the
description of the general terms and provisions of the Debt Securities set forth
in  the accompanying Prospectus  under "Description of  the Debt Securities," to
which reference is hereby made. The following description does not purport to be
complete and is subject to,  and is qualified in  its entirety by reference  to,
the  description set forth  in the Prospectus  and the provisions  of the Senior
Indenture referred to  therein. The Notes  will be  issued as a  series of  Debt
Securities  under the Senior  Indenture and, unless  otherwise specified in this
Prospectus Supplement,  the terms  and conditions  relating to  the Senior  Debt
Securities  set forth in "Description of the  Debt Securities" will apply to the
Notes. Capitalized terms not  otherwise defined herein  shall have the  meanings
given to them in the Prospectus.
 
                                      S-2
<PAGE>
GENERAL
 
    The Notes offered hereby will be limited to $150,000,000 aggregate principal
amount  and will be issued under the  Senior Indenture. The Notes will mature on
July 15, 2004. The Notes will bear interest  from July 17, 1996 at the rate  per
annum   shown  on  the  front  cover   of  this  Prospectus  Supplement  payable
semiannually on January  15 and  July 15 of  each year,  commencing January  15,
1997,  to the  person in  whose name the  Notes are  registered at  the close of
business on the January  1 or July 1,  as the case may  be, next preceding  such
interest payment date. The Notes are not entitled to any sinking fund.
 
REDEMPTION
 
    The Notes may not be redeemed by the Company at any time prior to maturity.
 
BOOK-ENTRY SYSTEM
 
    The  Notes will be issued in the  form of fully registered global notes. The
global notes  will  be deposited  with,  or on  behalf  of, the  Depositary  and
registered  in the name  of the Depositary's  nominee. Reference is  made to the
description of the Depositary's procedures with  respect to global notes in  the
accompanying  Prospectus under  "Description of  the Debt  Securities -- General
Provisions Applicable to Both Indentures -- Book-Entry System."
 
                                  UNDERWRITING
 
    Under the terms and subject to  the conditions contained in an  Underwriting
Agreement  dated July 11, 1996  (the "Underwriting Agreement"), the Underwriters
named below  (the  "Underwriters") have  severally  but not  jointly  agreed  to
purchase  from the  Company the  following respective  principal amounts  of the
Notes:
 
<TABLE>
<CAPTION>
                                                                        PRINCIPAL
UNDERWRITER                                                          AMOUNT OF NOTES
- -------------------------------------------------------------------  ---------------
<S>                                                                  <C>
Chase Securities Inc...............................................   $  66,000,000
UBS Securities LLC.................................................      66,000,000
BA Securities, Inc.................................................       4,500,000
BZW Securities Inc.................................................       4,500,000
NatWest Capital Markets Limited....................................       4,500,000
Nesbitt Burns Securities Inc.......................................       4,500,000
                                                                     ---------------
    Total..........................................................   $ 150,000,000
                                                                     ---------------
                                                                     ---------------
</TABLE>
 
    The Underwriting Agreement provides that the obligations of the Underwriters
to purchase the Notes are subject  to certain conditions precedent and that  the
Underwriters  will be obligated to purchase all  the Notes if any are purchased.
The Underwriting  Agreement provides  that, in  the  event of  a default  by  an
Underwriter, in certain circumstances the purchase commitments of non-defaulting
Underwriters may be increased or the Underwriting Agreement may be terminated.
 
    The  Company has been advised by the Underwriters that they propose to offer
the Notes to the public initially at the public offering price set forth on  the
cover  page of this Prospectus  Supplement and to certain  dealers at such price
less  a  concession  of  0.45%  of  the  principal  amount  per  Note,  and  the
Underwriters  and such dealers  may allow a  discount of 0.25%  of the principal
amount per Note  on sales  to certain other  dealers. After  the initial  public
offering,  the offering  price, concession  and discount  may be  changed by the
Underwriters.
 
    The Notes are a new issue of securities with no established trading  market.
The  Underwriters have advised the Company that  they presently intend to act as
market makers for the Notes. However,  the Underwriters are not obligated to  do
so  and  may  discontinue any  market  making  at any  time  without  notice. No
assurance can be given as to the liquidity of the trading market for the Notes.
 
    The Company  has  agreed  to  indemnify  the  Underwriters  against  certain
liabilities, including civil liabilities under the Securities Act, or contribute
to payments which the Underwriters may be required to make in respect thereof.
 
                                      S-3
<PAGE>
    NatWest  Capital Markets Limited ("NatWest"), a United Kingdom broker-dealer
and a member of  the Securities Futures Authority  Limited, has agreed that,  as
part  of the  distribution of  the Notes offered  hereby and  subject to certain
exceptions, it will not offer  or sell any Notes  within the United States,  its
territories  or possessions or to persons  who are citizens thereof or residents
therein. The Underwriting Agreement does not limit the sale of the Notes offered
hereby outside of the United States.
 
    NatWest has also represented and agreed that (i) it has not offered or  sold
and will not offer or sell any Notes to persons in the United Kingdom, except to
persons  whose  ordinary  activities  involve  acquiring,  holding,  managing or
disposing of  investments (as  principal or  agent) for  the purposes  of  their
businesses  or otherwise in  circumstances which have not  resulted and will not
result in an offer to the public in the United Kingdom within the meaning of the
Public Offers of Securities Regulations 1995, (ii) it has complied with and will
comply with all applicable  provisions of the Financial  Services Act 1986  with
respect  to anything done by  it in relation to the  Notes in, from or otherwise
involving the United Kingdom, and (iii) it has only issued or passed on and will
only issue or  pass on  in the  United Kingdom any  document received  by it  in
connection with the issue of the Notes to a person who is of a kind described in
Article  11(3) of  the Financial  Services Act  1986 (Investment Advertisements)
(Exemption) Order  1995 or  is a  person  to whom  such document  may  otherwise
lawfully be issued or passed on.
 
    Each  of the Underwriters and/or certain of their affiliates (other than UBS
Securities LLC)  has  engaged  in transactions  with  and  performed  investment
banking  and/or commercial banking  services for the Company  and certain of its
subsidiaries from time to time in the ordinary course of business, and each  may
do  so in the future.  Affiliates of each of  Chase Securities Inc., NatWest and
Nesbitt Burns Securities Inc. are  lenders under the Company's Revolving  Credit
Agreement, and affiliates of each of BA Securities, Inc. and BZW Securities Inc.
are co-agents and lenders under the Revolving Credit Agreement.
 
                                 LEGAL MATTERS
 
    The validity of the Notes will be passed upon for the Company by Akin, Gump,
Strauss,  Hauer & Feld, L.L.P., New York,  New York, and for the Underwriters by
Milbank, Tweed, Hadley & McCloy, New York, New York.
 
                                      S-4
<PAGE>
PROSPECTUS
                                  $500,000,000
                              ORYX ENERGY COMPANY
                                DEBT SECURITIES
                                PREFERRED STOCK
                                  COMMON STOCK
                               ------------------
 
    Oryx  Energy Company (Company)  may offer from  time to time  in one or more
series its unsecured debt securities (Debt Securities). The Debt Securities  may
be  senior  debt  securities  (Senior  Debt  Securities)  or  subordinated  debt
securities (Subordinated Debt Securities). The Subordinated Debt Securities  may
be  convertible into  shares of  Common Stock, $1.00  par value,  of the Company
(Common Stock). The Company may  also from time to  time offer shares of  Common
Stock or Preferred Stock, $1.00 par value, of the Company (Preferred Stock). The
aggregate  offering  price of  the  Debt Securities,  the  Common Stock  and the
Preferred Stock offered  hereby (Securities) will  not exceed $500,000,000.  The
Company  will offer  the Securities  to the  public from  time to  time on terms
determined by market conditions.
 
    The Senior  Debt  Securities will  be  senior obligations  of  the  Company,
unsecured  and unsubordinated to any other existing indebtedness of the Company.
Because the Company  is a holding  company, the Senior  Debt Securities will  be
effectively  subordinated to the indebtedness  (including trade payables) of the
Company's subsidiaries outstanding from time to time.
 
    The Subordinated Debt Securities will be subordinated in right of payment to
all present and future Senior Debt of the Company as defined herein.
 
    An accompanying Prospectus Supplement relating  to Debt Securities will  set
forth  the specific  terms of  the offering  and sale  of such  Debt Securities,
including the specific designation, aggregate principal amount, purchase  price,
maturity,  interest rate (or manner of  calculation thereof), time of payment of
interest, terms  for conversion  (if  any), listing  (if  any) on  a  securities
exchange,  any terms for mandatory or optional redemption and any other specific
terms of the series of  Debt Securities in respect  of which this Prospectus  is
being delivered (Offered Debt Securities).
 
    The  Offered Debt Securities  may be issuable  in registered definitive form
(Certificated Notes)  or may  be represented  by one  or more  permanent  global
securities (Global Notes), as specified in the applicable Prospectus Supplement.
Except in limited circumstances, owners of beneficial interests in a Global Note
will not be entitled to receive physical delivery of Certificated Notes and will
not  be considered the  holders thereof. See "Description  of Debt Securities --
Book-Entry System."
 
    The Prospectus Supplement relating  to Preferred Stock  will also set  forth
the  specific designation, number of shares, rights, preferences, privileges and
restrictions, including dividend rate (or  manner of calculation thereof),  time
of  payment  of dividends,  liquidation value,  terms  for conversion  (if any),
voting rights,  listing  (if  any)  on a  securities  exchange,  any  terms  for
mandatory  or optional redemption and any other  specific terms of the series of
Preferred Stock in respect of which this Prospectus is being delivered  (Offered
Preferred  Stock, and together with Offered Debt Securities and any Common Stock
offered by such Prospectus Supplement, Offered Securities).
 
    The Securities will be sold either through underwriters, dealers or  agents,
or  directly by the Company. The applicable Prospectus Supplement will set forth
the names of  any underwriters or  agents involved  in the sale  of the  Offered
Securities,  the proposed amounts,  if any, to be  purchased by underwriters and
the compensation, if any, of such underwriters or agents.
 
    The Common Stock is listed on the New York Stock Exchange.
                           --------------------------
 
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.
                            ------------------------
 
    This  Prospectus may  not be used  to consummate sales  of Securities unless
accompanied by a Prospectus Supplement.
 
                           --------------------------
 
                The date of this Prospectus is October 17, 1995
<PAGE>
    NO  PERSON  HAS BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION OR  TO  MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN  OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED.  THIS  PROSPECTUS  DOES  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN  OFFER TO BUY  ANY SECURITIES IN  ANY CIRCUMSTANCES IN  WHICH
SUCH  OFFER OR SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY SALE HEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE ANY  IMPLICATION
THAT  THERE HAS  BEEN NO  CHANGE IN THE  AFFAIRS OF  THE COMPANY  SINCE THE DATE
HEREOF OR THAT INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT
TO ITS DATE.
 
                            ------------------------
 
                             AVAILABLE INFORMATION
 
    The Company (Commission File  No. 1-10053) is  subject to the  informational
requirements  of the Securities Exchange Act of 1934, as amended (Exchange Act),
and in accordance therewith files reports, proxy and information statements  and
other information with the Securities and Exchange Commission (Commission). Such
reports, proxy and information statements and other information can be inspected
and  copied at the  public reference facilities maintained  by the Commission at
450 Fifth Street, N.W., Washington, D.C. 20549 and at the Commission's  regional
offices  at  Suite  1400,  Northwest Atrium  Center,  500  West  Madison Street,
Chicago, Illinois 60661 and Seven World Trade Center, 13th Floor, New York,  New
York  10048.  Copies of  such  material can  also  be obtained  from  the Public
Reference Section  of the  Commission in  Washington, D.C.  20549 at  prescribed
rates.  In addition, such material and  other information concerning the Company
can be inspected at the offices of the New York Stock Exchange, 20 Broad Street,
New York, New York.
 
    The Company has filed with the  Commission a registration statement on  Form
S-3  (herein, together  with all  amendments, supplements  and exhibits thereto,
referred to as the Registration Statement) under the Securities Act of 1933,  as
amended  (Securities Act), with  respect to the  Securities offered hereby. This
Prospectus, which forms a part of  the Registration Statement, does not  contain
all  the information set  forth in the Registration  Statement, certain parts of
which  are  omitted  in  accordance  with  the  rules  and  regulations  of  the
Commission.   For  further  information,   reference  is  hereby   made  to  the
Registration Statement.
 
                            ------------------------
 
                    INCORPORATION OF DOCUMENTS BY REFERENCE
 
    The  Company  hereby  incorporates  by  reference  in  this  Prospectus  the
following documents filed with the Commission (File No. 1-10053): (i) the Annual
Report  on Form 10-K of the Company for the fiscal year ended December 31, 1994;
(ii) the Quarterly  Report on Form  10-Q of  the Company for  the quarter  ended
March  31, 1995; (iii) the Quarterly Report on  Form 10-Q of the Company for the
quarter ended June 30, 1995; and (iv)  the Company's Current Report on Form  8-K
dated October 17, 1995.
 
    All  documents filed by the Company 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  Securities  shall be  deemed  to  be
incorporated  by reference in this  Prospectus and to be  a part hereof from the
date of filing of such documents.
 
    Any statement contained herein or 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  subsequently  filed document  which  also  is or  is  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.
 
    Copies of  the above  documents (excluding  exhibits) may  be obtained  upon
request  without  charge  from  the  Company,  13155  Noel  Road,  Dallas, Texas
75240-5067; Attn: Mr. Robert L. Thompson, Comptroller, telephone (214) 715-4000.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    Oryx Energy Company (together with its consolidated subsidiaries, unless the
context  otherwise requires, Company) engages exclusively in the exploration for
and the development and production of oil and gas. The Company has a strong base
of U.S.  and international  reserves and  production primarily  in the  Gulf  of
Mexico,  the southwestern  U.S., the  U.K. North  Sea and  Ecuador. It  also has
exploration and development projects in the Gulf of Mexico, the U.K. North  Sea,
Kazakhstan,  Australia and Algeria. The Company's  business in the United States
is conducted  through Sun  Energy  Partners, L.P.  (Partnership), of  which  the
Company is the Managing General Partner. At December 31, 1994, the Company had a
98 percent ownership interest in the Partnership.
 
    The  Company was incorporated  in Delaware in  1971. The Company's principal
executive office is located at 13155 Noel Road, Dallas, Texas 75240-5067 and the
telephone number is (214) 715-4000.
 
                                USE OF PROCEEDS
 
    Unless otherwise  specified in  the  applicable Prospectus  Supplement,  the
Company  intends to  use the net  proceeds from  the sale of  the Securities for
general  corporate  purposes,  including  repayment  of  existing  indebtedness,
capital  expenditures and working capital  requirements. Any specific allocation
of the  net proceeds  of an  offering of  Securities will  be described  in  the
related  Prospectus Supplement.  The precise amount  and timing of  sales of the
Securities will be dependent  on the Company's  capital requirements and  market
conditions and the availability and cost of other funds to the Company.
 
         CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS
           TO FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS
 
    The  following table sets forth the consolidated ratios of earnings to fixed
charges and earnings to fixed charges and preferred stock dividend  requirements
for the Company for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                                                  YEAR ENDED DECEMBER 31
                                                                        SIX MONTHS ENDED    ----------------------------------
                                                                          JUNE 30, 1995     1994*   1993*   1992* 1991*  1990
                                                                        -----------------   -----   -----   ----  ----  ------
<S>                                                                     <C>                 <C>     <C>     <C>   <C>   <C>
Ratio of earnings to fixed charges....................................        1.52           --      --     --    --     2.26
Ratio of earnings to fixed charges and preferred stock dividend
 requirements.........................................................        1.52           --      --     --    --     2.21
<FN>
- ------------------------
*  Earnings  were  inadequate  to  cover fixed  charges,  or  fixed  charges and
  preferred stock dividend requirements, by  $97 million for 1994, $147  million
  for 1993, $44 million for 1992 and $75 million for 1991.
</TABLE>
 
                       DESCRIPTION OF THE DEBT SECURITIES
 
    The  following  sets  forth  certain general  terms  and  provisions  of the
indentures under which  the Debt  Securities are  to be  issued. The  particular
terms  of  the Offered  Debt  Securities will  be  set forth  in  the Prospectus
Supplement relating to such Offered Debt Securities.
 
    The Senior Debt  Securities may be  issued in  one or more  series under  an
indenture  dated as of  September 15, 1988,  as amended and  supplemented by the
First Supplemental  Indenture  dated as  of  April 1,  1991  (Senior  Indenture)
between  the Company and The Bank of  New York, as trustee (Senior Trustee). The
Subordinated Debt  Securities may  be issued  in  one or  more series  under  an
indenture  (Subordinated  Indenture) between  the Company  and Bank  of Montreal
Trust Company, as trustee (Subordinated Trustee).
 
    The  Senior  Indenture   and  the  Subordinated   Indenture  are   sometimes
hereinafter  collectively referred to as the  Indentures. The Senior Trustee and
the Subordinated Trustee are sometimes  hereinafter collectively referred to  as
the Trustees.
 
    Copies  of the  Indentures have been  filed as exhibits  to the Registration
Statement. The following summary of the material provisions of the Indentures is
subject to, and is qualified in its entirety by reference to, all provisions  of
the  Indentures and  the Debt Securities,  including the  definitions therein of
certain terms.
 
                                       3
<PAGE>
GENERAL PROVISIONS APPLICABLE TO BOTH INDENTURES
 
    The  Indentures  do  not  limit  the  aggregate  principal  amount  of  Debt
Securities  that may be issued  by the Company and  provide that Debt Securities
may be issued  from time to  time in  series. Unless otherwise  specified in  an
applicable  Prospectus Supplement with  respect to a  series of Debt Securities,
the Debt Securities will be issued in registered form in denominations of $1,000
and any  multiple thereof.  The Debt  Securities of  any series  will be  issued
initially  as either  certificated notes  or global  notes, as  specified in the
applicable Prospectus Supplement. Except as set forth under "Description of  the
Debt  Securities --  Book-Entry System,"  global notes  will not  be issuable as
certificated notes. Principal is to be payable, and the Debt Securities will  be
transferable and exchangeable, at the office or agency of the Company maintained
for  such purposes in New York City, which initially will be the Corporate Trust
Office  of  the  applicable  Trustee;   PROVIDED  that  global  notes  will   be
exchangeable  only in the manner  and to the extent  set forth under "Book-Entry
System." The Debt  Securities may  be transferred, combined  or divided  without
payment of any charge other than taxes or other governmental charges. Payment of
interest  may, at  the option of  the Company, be  made by check  mailed to such
registered holders.
 
    Because the Company conducts substantially all of its operations through its
subsidiaries (including the Partnership), the Company's rights and the rights of
its creditors, including the holders of  the Debt Securities, to participate  in
the distribution of the assets of the subsidiaries of the Company, including the
Partnership,  upon any liquidation or reorganization  of any such subsidiary, or
otherwise,  will  be  subject  to  the   prior  claims  of  creditors  of   such
subsidiaries,  except to the  extent that the  Company may itself  be a creditor
with recognized claims against any subsidiary. The ability of the Company to pay
principal and interest on the Debt  Securities is, to a large extent,  dependent
upon the payment to it of distributions, dividends, interest or other amounts by
its subsidiaries (including the Partnership).
 
    The  Prospectus Supplement will describe the  following terms of the Offered
Debt Securities: (1) the title of the Offered Debt Securities; (2) any limit  on
the  aggregate principal amount of the Offered  Debt Securities; (3) the date or
dates on which the Offered  Debt Securities may be issued  and are, or will  be,
payable;  (4) the rate  or rates per annum  (which may be  fixed or variable) at
which the Offered Debt Securities will bear interest or the method by which such
rate or rates shall be determined and the date or dates from which such interest
will accrue; (5) the date  or dates on which such  interest on the Offered  Debt
Securities will be payable and the record dates for the determination of holders
to  whom interest is payable on any such interest payment dates; (6) each office
or agency where, subject to the terms of the applicable Indenture, the principal
of, and premium, if any, and any interest on the Offered Debt Securities will be
payable and each office or agency where, subject to the terms of the  applicable
Indenture,  the Offered  Debt Securities  may be  presented for  registration of
transfer or  exchange; (7)  the period  or periods  within which,  the price  or
prices  at which, and the  terms and conditions, if  any, upon which the Offered
Debt Securities  may  be  redeemed  at  the  option  of  the  Company;  (8)  the
obligation,  if any, of the Company to  redeem, to repay or purchase the Offered
Debt Securities pursuant to any sinking  fund or analogous provisions or at  the
option  of a holder thereof and the period or periods within which, the price or
prices at  which  and the  terms  and conditions  upon  which the  Offered  Debt
Securities   will  be  redeemed,  repaid  or  purchased  pursuant  to  any  such
obligation; (9) in the  case of Subordinated Debt  Securities, whether and  upon
what  terms such  Debt Securities  will be  convertible into  Common Stock; (10)
whether the  Offered  Debt Securities  are  to  be issued  with  original  issue
discount  within the meaning of Section 1273(a)  of the Internal Revenue Code of
1986, as amended (Code), and the  regulations thereunder; (11) any addition  to,
or  modification or deletion of, any Events of Default or covenants provided for
with respect  to the  Offered Debt  Securities; (12)  whether the  Offered  Debt
Securities  are to  be issued  as certificated notes  or global  notes; (13) the
currency or currencies (including composite currencies) in which payments on the
Offered Debt Securities are to be made if other than U.S. dollars; and (14)  any
other detailed terms and provisions of the Offered Debt Securities which are not
inconsistent  with the applicable Indenture. Any such Prospectus Supplement will
also describe any special provisions for the payment of additional amounts  with
respect to the Offered Debt Securities.
 
    Debt  Securities may be  issued as Original Issue  Discount Securities to be
sold at  a  discount  below  their principal  amount.  Original  Issue  Discount
Securities   means   any   Debt   Securities   issued   with   "original   issue
 
                                       4
<PAGE>
discount" within the meaning of Section 1273(a) of the Code and the  regulations
thereunder.  United  States income  tax and  other considerations  applicable to
Original  Issue  Discount  Securities  will  be  described  in  the   Prospectus
Supplement  relating thereto. Original Issue Discount Securities may provide for
the declaration  of acceleration  of the  maturity of  an amount  less than  the
principal  amount thereof  upon the  occurrence of an  Event of  Default and the
continuation thereof.
 
BOOK-ENTRY SYSTEM
 
    If so specified in the applicable Prospectus Supplement, a series of Offered
Debt Securities  may  be  issued as  global  notes.  Each global  note  will  be
deposited with, or on behalf of, a depositary, which, unless otherwise specified
in  the applicable Prospectus Supplement, will  be The Depository Trust Company,
New York, New York (Depositary), and registered in the name of a nominee of  the
Depositary.  Certificated notes will  not be exchangeable  for global notes and,
except under  the  circumstances  described  below, global  notes  will  not  be
exchangeable  for  certificated  notes and  will  not otherwise  be  issuable as
certificated notes.
 
    The Depositary  has advised  the Company  as follows:  The Depositary  is  a
limited-purpose  trust  company  organized under  the  New York  Banking  Law, a
"banking organization" within the meaning of the New York Banking Law, a  member
of  the Federal Reserve  System, a "clearing corporation"  within the meaning of
the New  York  Uniform  Commercial  Code, and  a  "clearing  agency"  registered
pursuant  to the  provisions of  Section 17A of  the Securities  Exchange Act of
1934. The  Depositary  holds  securities that  its  participants  (Participants)
deposit  with  the Depositary.  The Depositary  also facilitates  the settlement
among Participants of securities transactions, such as transfers and pledges, in
deposited securities  through  electronic  computerized  book-entry  changes  in
Participants'  accounts, thereby eliminating  the need for  physical movement of
securities certificates.  Direct  participants include  securities  brokers  and
dealers,  banks,  trust  companies,  clearing  corporations  and  certain  other
organizations. The Depositary is  owned by a number  of its direct  participants
and  by the New York Stock Exchange,  Inc., the American Stock Exchange Inc. and
the National Association of  Securities Dealers, Inc.  Access to the  Depositary
Trust  Company system is also available to others such as securities brokers and
dealers, banks and trust  companies that clear through  or maintain a  custodial
relationship with a direct participant, either directly or indirectly. The Rules
applicable  to  the  Depositary  and  its  Participants  are  on  file  with the
Commission.
 
    Unless otherwise  specified in  the applicable  Prospectus Supplement,  Debt
Securities  which are to be represented by a global note to be deposited with or
on behalf of the Depositary will be  represented by a global note registered  in
the  name of such depositary or its nominee.  Upon the issuance of a global note
in registered form, the Depositary  will credit, on its book-entry  registration
and  transfer system,  the respective principal  amounts of  the Debt Securities
represented by  such global  note  to the  accounts  of institutions  that  have
accounts  with such depositary or its nominee (participants). The accounts to be
credited shall  be  designated  by  the underwriters  or  agents  of  such  Debt
Securities  or by  the Company,  if such  Debt Securities  are offered  and sold
directly by the Company. Ownership of beneficial interests in such global  notes
will  be  limited to  participants or  persons that  may hold  interests through
participants. Ownership of beneficial interests  by participants in such  global
notes  will be  shown on, and  the transfer  of that ownership  interest will be
effected only through, records maintained by  the Depositary or its nominee  for
such  global notes. Ownership of beneficial interests in global notes by persons
that hold  through participants  will be  shown  on, and  the transfer  of  that
ownership  interest  within  such  participant will  be  effected  only 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 limits and such laws may impair the ability to transfer
beneficial interests in a global note.
 
    So long as  the Depositary  for a  global note  in registered  form, or  its
nominee,  is the registered owner  of such global note,  such depositary or such
nominee, as the case may be, will be considered the sole owner or holder of  the
Debt  Securities  represented by  such global  note for  all purposes  under the
Indenture. Except as  set forth below,  owners of beneficial  interests in  such
global  note  will  not  be  entitled to  have  Debt  Securities  of  the series
represented by such global note registered  in their names, will not receive  or
be  entitled to receive physical  delivery of Debt Securities  of such series in
definitive form and will  not be considered the  owner or holders thereof  under
the applicable Indenture.
 
                                       5
<PAGE>
    Payment  of  principal  of,  premium,  if  any,  and  any  interest  on Debt
Securities 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 owner  or  the holder  of  the  global note  representing  such  Debt
Securities.  None of the Company, the Trustee, any paying agent or the registrar
for such  Debt Securities  will have  any responsibility  or liability  for  any
aspect  of the  records relating  to or payments  made on  account of beneficial
ownership  interests  in  a  global  note  for  such  Debt  Securities  or   for
maintaining,  supervising or reviewing  any records relating  to such beneficial
ownership interests.
 
    The Company has  been advised by  the Depositary that,  upon receipt of  any
payment  of principal,  premium or interest  in respect of  any permanent global
note,  the  Depositary  will  credit  immediately  participants'  accounts  with
payments  in amounts proportionate  to their respective  beneficial interests in
the principal  amount of  such  global note  as shown  on  the records  of  such
depositary.  The Company also expects that payments by participants to owners of
beneficial interests in such global note held through such participants will  be
governed  by standing instructions  and customary practices, as  is now the case
with securities held for the accounts of customers in bearer form or  registered
in "street name," and will be the responsibility of such participants.
 
    A  global note may not be transferred except as a whole by the Depositary to
a nominee  of  such depositary  or  by a  nominee  of such  depositary  to  such
depositary  or another nominee of  such depositary or by  such depositary or any
such nominee to a successor of such  depositary or a nominee of such  successor.
If  the Depositary is at any time  unwilling or unable to continue as depositary
and a successor depositary is not  appointed by the Company within ninety  days,
the  Company  will issue  certificated notes  in  definitive registered  form in
exchange for the  global note  or Notes  representing such  Debt Securities.  In
addition,  the Company may at any time  and in its sole discretion determine not
to have any Debt Securities in registered form represented by one or more global
notes and, in such  event, will issue certificated  notes in definitive form  in
exchange  for the global note or Notes representing such Debt Securities. In any
such instance,  an owner  of a  beneficial interest  in a  global note  will  be
entitled  to physical delivery  in definitive form of  certificated notes of the
series represented  by  such global  note  equal  in principal  amount  to  such
beneficial interest and to have such certificated notes registered in its name.
 
CONSOLIDATION, MERGER OR SALE
 
    Nothing  contained in the Indentures prevents any consolidation or merger of
the Company with or into any  other corporation or corporations (whether or  not
affiliated  with the Company) or any sale  or conveyance of all or substantially
all the property of the Company to any other corporation, provided that upon any
such consolidation, merger, sale or conveyance of or by the Company, other  than
a  consolidation or merger  in which the Company  is the continuing corporation,
the due and  punctual payment  of the  principal of,  and premium,  if any,  and
interest  on, all of the Debt Securities,  according to their tenor, and the due
and punctual performance and observance of  all the covenants and conditions  of
the  Indentures and  the Debt  Securities to  be performed  by the  Company, are
expressly assumed by the corporation formed by such consolidation, or into which
the Company  shall have  been merged,  or by  the corporation  which shall  have
acquired such property.
 
MODIFICATION OF THE INDENTURES
 
    The  Indentures contain provisions permitting the Company and the applicable
Trustee, with the  consent of the  holders of not  less than 66  2/3 percent  in
principal  amount of the outstanding Debt Securities of each series affected, to
modify the applicable Indenture or any applicable supplemental indenture or  the
rights  of the holders of  the Debt Securities of  such series; provided that no
such modification shall without the consent  of the holders of each  outstanding
Debt  Security  affected  thereby  (a)  change the  fixed  date  upon  which the
principal of or the interest on any Debt Security is due and payable, or  reduce
the  principal amount  thereof or  the rate  of interest  thereon or  any amount
payable upon the redemption thereof, or reduce the amount of the principal of an
Original Issue Discount  Security that would  be payable upon  a declaration  of
acceleration  of the maturity thereof,  or change the place  or places where, or
the currency in which, any Debt Security or any interest thereon is payable,  or
impair  the right  to institute suit  for the  enforcement of any  payment on or
after the date  on which  such is  due (or,  in the  case of  redemption, on  or
 
                                       6
<PAGE>
after  the  date fixed  for redemption)  or,  in the  case of  Subordinated Debt
Securities, impair the right to convert  such Debt Securities into Common  Stock
or,  in the case of  Subordinated Debt Securities, modify  the provisions of the
Subordinated Indenture with respect to the subordination of such Debt Securities
in a manner adverse to holders thereof or (b) reduce the aforesaid percentage of
Debt Securities,  the  consent of  the  holders of  which  is required  for  any
modification of the applicable Indenture or for waiver by the holders of certain
of their rights.
 
    The  Indentures  also  contain  provisions permitting  the  Company  and the
applicable Trustee to  amend the applicable  Indenture in certain  circumstances
without the consent of the holders of any Debt Securities to evidence the merger
of  the Company, or  the replacement of  the applicable Trustee  and for certain
other purposes.
 
EVENTS OF DEFAULT
 
    An Event of Default with respect to Debt Securities of any series is defined
in the Indentures as being:  default for 30 days in  payment of any interest  of
the  Debt Securities of such series;  default in payment of principal, including
the payment of principal when due  pursuant to any redemption provision, of  the
Debt  Securities of  such series;  default for 90  days after  written notice in
performance of any other covenant in the Indenture applicable to the  Securities
of  such series; provided, however, that such a  default will not be an Event of
Default if it cannot with due diligence  be cured within such 90-day period  due
to  causes  beyond the  control  of the  Company;  default under  any instrument
evidencing indebtedness  for  borrowed  money,  if  indebtedness  in  excess  of
$10,000,000 is thereby accelerated and such acceleration is not rescinded within
30  days after written notice is given  to the Company by the applicable Trustee
or to the Company  and the applicable  Trustee by the holders  of 25 percent  or
more  in  aggregate principal  amount  of the  Debt  Securities of  that series;
certain  events  of  bankruptcy,  insolvency,  reorganization,  receivership  or
liquidation  involving  the  Company,  the  Partnership,  Sun  Operating Limited
Partnership or Oryx U.K. Energy Company; or any other Event of Default  provided
with  respect to Debt Securities of that series. The Company will be required to
file with the  applicable Trustee annually  an officers' certificate  as to  the
absence  of default in  performance of certain covenants  in the Indentures. The
Indentures provide  that  the applicable  Trustee  may withhold  notice  to  the
holders  of the Debt Securities  of any default (except  in payment of principal
of, or interest on,  the Debt Securities)  if such Trustee  considers it in  the
interest  of the holders of the Debt Securities to do so. The Indentures provide
that, if an Event of Default with  respect to the Debt Securities of any  series
specified  therein shall have happened and  be continuing, either the applicable
Trustee or the holders of  25 percent or more  in aggregate principal amount  of
the  Debt Securities of that series may  declare the principal amount (or if the
Debt Securities  are Original  Issue Discount  Securities, such  portion of  the
principal as may be specified in the terms of that series of Debt Securities) of
all  the Debt Securities and the interest  accrued thereon to be due and payable
immediately, but if the Company shall  cure all defaults (except the  nonpayment
of  principal of and accrued  interest on Debt Securities  which shall be become
due by acceleration) and certain other conditions are met, such declaration  may
be  annulled and  past defaults may  be waived by  the holders of  a majority in
aggregate principal amount of the Debt Securities of that series.
 
    Subject to the provisions  of the Indentures relating  to the duties of  the
Trustees, the Trustees will be under no obligation to exercise any of its rights
or powers under the Indentures at the request or direction on any of the holders
of the Debt Securities, unless such holders shall have offered to the applicable
Trustee reasonable indemnity. Subject to such provision for indemnification, the
holders of a majority in principal amount of the Debt Securities of a particular
series  will have the right  to direct the time,  method and place of conducting
any proceeding for any remedy available to the applicable Trustee, or exercising
any trust or power conferred on the applicable Trustee with respect to the  Debt
Securities  of that series, provided that  the applicable Trustee shall have the
right to decline to  follow any such direction  if such Trustee shall  determine
that  the action  so directed conflicts  with any  law or the  provisions of the
applicable Indenture or if such Trustee  shall determine that such action  would
involve  such Trustee in  personal liability or would  be prejudicial to holders
not taking part in such direction.
 
                                       7
<PAGE>
GOVERNING LAW
 
    The Indentures and the Debt Securities will be governed by and construed  in
accordance with the laws of the State of New York.
 
CONCERNING THE TRUSTEES
 
    The  Bank of New York  is Senior Trustee under  the Senior Indenture and has
been appointed by the Company as Registrar  and Paying Agent with regard to  the
Senior Debt Securities.
 
    Bank   of  Montreal  Trust   Company  is  Subordinated   Trustee  under  the
Subordinated Indenture and has  been appointed by the  Company as Registrar  and
Paying  Agent with regard to the  Subordinated Debt Securities. Bank of Montreal
Trust Company and its affiliates have other customary banking relations with the
Company.
 
SENIOR INDENTURE PROVISIONS
 
GENERAL
 
    The Senior  Debt  Securities will  be  senior obligations  of  the  Company,
unsecured  and unsubordinated to any other  indebtedness of the Company. Because
the Company is a holding company, the Senior Debt Securities will be effectively
subordinated to the  indebtedness (including  trade payables)  of the  Company's
subsidiaries  outstanding from time to time. As  of June 30, 1995, the Company's
subsidiaries had aggregate  indebtedness of  $190 million  outstanding to  third
parties,  including  approximately $89  million  of trade  payables.  The Senior
Indenture contains  no  restrictions  on  the ability  of  the  Company  or  its
subsidiaries to incur additional indebtedness and except as set forth below, the
Senior  Indenture contains no restrictions on the ability of the Company and its
subsidiaries to incur secured indebtedness.
 
LIMITATIONS ON LIENS
 
    Nothing in the Senior  Indenture or the Senior  Debt Securities will in  any
way  limit the amount of indebtedness  or securities (other than the Securities)
which may be incurred or issued by  the Company or any of its subsidiaries.  The
Senior Indenture provides that neither the Company nor any Restricted Subsidiary
(as  defined below) will issue, assume or guarantee any notes, bonds, debentures
or other similar evidences of indebtedness for money borrowed (Debt) secured  by
a  mortgage, lien,  pledge or other  encumbrance (Mortgage)  upon any Restricted
Property (as defined below) without  effectively providing that the  outstanding
Senior  Debt Securities (together with, if  the Company so determines, any other
indebtedness or obligation then existing or thereafter created, ranking  equally
with  the Senior Debt Securities) shall be  secured equally and ratably with (or
prior to) such Debt so long as  such Debt shall be so secured. This  restriction
will  not, however, apply to (a) Mortgages on  property to secure all or part of
the cost of exploration, drilling or development  thereof or all or part of  the
cost  of altering or repairing equipment used in connection therewith or (in the
case  of  property  which  is,  in  the  opinion  of  the  Board  of  Directors,
substantially unimproved for the use intended by the Company) all or part of the
cost of improvement thereof, or to secure Debt incurred to provide funds for any
such purpose; (b) Mortgages which secure only indebtedness owing by a Subsidiary
(as  defined below) to  the Company, or to  one or more  Subsidiaries, or to the
Company and  one or  more Subsidiaries;  (c) Mortgages  on the  property of  any
corporation  or other  entity existing  at the  time such  corporation or entity
becomes a Subsidiary;  (d) Mortgages  on any property  to secure  Debt or  other
indebtedness  incurred  in  connection with  the  construction,  installation or
financing of  pollution  control  or  abatement facilities  or  other  forms  of
industrial  revenue bond  financing or Debt  issued or guaranteed  by the United
States, any State or any department, agency or instrumentality of either; or (e)
any extension,  renewal  or replacement  of  any  Mortgage referred  to  in  the
foregoing  clauses (a) through  (d) or of  any Mortgage existing  on the date of
original  issuance  of  the  applicable   series  of  Senior  Debt   Securities.
Notwithstanding  the  foregoing,  the Company  and  any one  or  more Restricted
Subsidiaries may issue,  assume or guarantee  Debt secured by  a Mortgage  which
would  otherwise  be  subject  to the  foregoing  restrictions  in  an aggregate
principal amount which, together with the aggregate outstanding principal amount
of all other Debt of the Company and its Restricted Subsidiaries so secured, and
the aggregate  value  of  the  sale  and  lease-back  transactions  which  would
otherwise be subject to the restrictions described under "Limitation on Sale and
Lease-Back,"  does not at the  time such Debt is  incurred exceed ten percent of
the Shareholders' Equity  in the  Company and its  consolidated subsidiaries  as
shown in the latest audited
 
                                       8
<PAGE>
consolidated  balance sheet of the Company. The following types of transactions,
among others, shall not be deemed to  create Debt secured by Mortgages: (1)  the
sale or other transfer of crude oil, natural gas or other petroleum hydrocarbons
in  place for a period of time until,  or in an amount such that, the transferee
will realize therefrom a specified amount (however determined) of money or  such
crude  oil, natural  gas or  other petroleum hydrocarbons  or the  sale or other
transfer of any other interest in property of the character commonly referred to
as a production payment or as an overriding royalty; and (2) Mortgages  required
by  any contract or  statute in order to  permit the Company  or a Subsidiary to
perform any contract or  subcontract made by  it with or at  the request of  the
United States, any State or any department, agency or instrumentality of either,
or  to secure partial, progress, advance or other payments to the Company or any
Subsidiary by such governmental unit pursuant to the provisions of any  contract
or statute.
 
    The  Senior  Indenture  contains  no limitations  on  Mortgages  on property
acquired or constructed after  the date of original  issuance of the  applicable
series  of  Senior Debt  Securities or  property owned  which is  not Restricted
Property. The term Restricted Property is defined to mean any interest owned  on
the date of original issuance of the applicable series of Senior Debt Securities
by  the Company or a Subsidiary in  property situated in the United States (both
onshore and  offshore) classified  by such  owner as  productive of  crude  oil,
natural  gas or other petroleum hydrocarbons in paying quantities as of the date
of issuance of the applicable series of Senior Debt Securities and any shares of
capital stock or indebtedness  of a Restricted  Subsidiary. The term  Restricted
Subsidiary  is defined to mean any Subsidiary  (as defined below) of the Company
which owns  Restricted Property.  The term  Subsidiary is  defined to  mean  any
corporation,  partnership, association, company, business  trust or other entity
in which the Company directly or indirectly  (i) owns or controls a majority  of
the  outstanding voting securities  having by the  terms thereof ordinary voting
power to elect a majority of the board of directors (or other body fulfilling  a
substantially  similar function) of such entity  (irrespective of whether or not
at the time any other class or  classes of such voting securities shall have  or
might  have voting power by reason of  the happening of any contingency) or (ii)
in the case of an entity which does not have a board of directors (or other body
fulfilling a substantially similar  function) has the  authority to control  the
policies  of such entity  (including any partnership  of which the  Company or a
Subsidiary is a managing general partner).
 
LIMITATION ON SALE AND LEASE-BACK
 
    The Senior Indenture provides  that neither the  Company nor any  Restricted
Subsidiary  will  enter into  any arrangement  with any  person (other  than the
Company or a Restricted Subsidiary) providing for the leasing to the Company  or
a  Restricted Subsidiary for a period of more than three years of any Restricted
Property which has been, or is to be, sold or transferred by the Company or such
Restricted Subsidiary to such person or to any person (other than the Company or
a Restricted Subsidiary) to which funds have been or are to be advanced by  such
person  on the security of the leased  property unless either (a) the Company or
such Restricted  Subsidiary  would  be  entitled,  pursuant  to  the  provisions
described  under  "Limitations on  Liens" above,  to incur  Debt in  a principal
amount equal to or exceeding the value of such sale and lease-back  transaction,
secured  by a Mortgage on the property to be leased, without equally and ratably
securing the outstanding Senior Debt Securities,  or (b) the Company, during  or
immediately after the expiration of four months after the effective date of such
transaction, applies to the voluntary retirement of its indebtedness maturing by
its  terms more than one year after  the original creation thereof (Funded Debt)
an amount equal to the  greater of the net proceeds  of the sale or transfer  of
the  property leased in such transaction or the fair value in the opinion of the
Board of  Directors  of  such  property  at  the  time  of  entering  into  such
transaction  (in either case  adjusted proportionately to  reflect the remaining
term of the lease), less an amount equal to the sum of (i) the principal  amount
of Senior Debt Securities delivered, within four months after the effective date
of such arrangement, to the Trustee for retirement and cancellation and (ii) the
principal  amount of other Funded Debt voluntarily retired by the Company within
such four month period excluding retirements of Senior Debt Securities and other
Funded Debt as a result of conversions or pursuant to mandatory sinking fund  or
mandatory prepayment provisions or by payment at maturity.
 
    The  Senior Indenture contains no limitations  on the sale and lease-back of
property acquired or  constructed after  the date  of original  issuance of  the
applicable  series of Senior Debt  Securities or of any  property owned which is
not Restricted Property.
 
                                       9
<PAGE>
    Unless otherwise  specified  in  the Prospectus  Supplement  relating  to  a
particular  series of Offered  Debt Securities, the  covenants applicable to the
Senior Debt Securities would  not necessarily afford  holders protection in  the
event  of a  highly leveraged  transaction, a sale  of assets,  an incurrance of
additional unsecured debt or other  similar transactions involving the  Company,
whether  or not involving a downgrade in the ratings accorded to the Senior Debt
Securities by any nationally recognized statistical rating organization.
 
CONSOLIDATION, MERGER OR SALE
 
    In addition  to the  provisions described  above under  "General  Provisions
Applicable  to Both  Indentures --  Consolidation, Merger  or Sale,"  the Senior
Indenture also provides that if, upon any consolidation or merger of the Company
with or into  any other corporation  or upon any  sale or conveyance  of all  or
substantially  all of its property to any other corporation, any of the property
of the  Company or  of any  Subsidiary  would thereupon  become subject  to  any
mortgage,  lien  or pledge,  the  Company will  before or  at  the time  of such
consolidation, merger, sale  or conveyance  secure the  Senior Debt  Securities,
equally  and ratably with any other obligations of the Company or any Subsidiary
then entitled thereto, by a direct lien on all such property prior to all  liens
other than any liens already existing thereon.
 
DEFEASANCE
 
    Unless  otherwise specified in the Prospectus Supplement with respect to the
Offered Debt Securities of any series, the  Company, at its option, (a) will  be
Discharged  (as defined in the Senior Indenture) from any and all obligations in
respect of any series of Senior Debt Securities (except in each case for certain
obligations to  register the  transfer or  exchange of  Senior Debt  Securities,
replace  stolen,  lost  or  mutilated Senior  Debt  Securities,  maintain paying
agencies and hold  moneys for  payment in  trust) or  (b) need  not comply  with
certain   covenants  of  the  Indenture   described  under  "General  Provisions
Applicable to Both Indentures " and "Senior Indenture Provisions" nor be subject
to the operation of the  cross acceleration provisions described under  "General
Provisions  Applicable  to  Both Indentures  --  Events  of Default"  or  to the
provisions relating to redemption of the Senior Debt Securities of such  series,
in  each case, if the  Company irrevocably deposits with  the Senior Trustee, in
trust, money or U.S. Government Obligations (as defined in the Senior Indenture)
which  through  the  payment  of  interest  thereon  and  principal  thereof  in
accordance  with their terms will  provide money in an  amount sufficient to pay
all the principal of  and interest on  the Senior Debt  Securities on the  dates
such payments are due in accordance with the terms of such series of Senior Debt
Securities.  To exercise any such option, the  Company is required to deliver to
the Senior Trustee an opinion  of counsel or revenue  ruling to the effect  that
the  holders will  not recognize  income, gain  or loss  for Federal  income tax
purposes as a result of the deposit  and related defeasance and will be  subject
to Federal income tax on the same amounts and in the same manner and at the same
times  as would have been the case if  such defeasance had not occurred, and, in
the case of  a Discharge pursuant  to clause (a),  if the issue  of Senior  Debt
Securities  is then listed on the New York Stock Exchange, an opinion of counsel
that the  deposit and  related defeasance  would not  subject such  Senior  Debt
Securities to delisting.
 
SUBORDINATED INDENTURE PROVISIONS
 
GENERAL
 
    The Subordinated Debt Securities will be unsecured, subordinated obligations
of  the Company. The Subordinated  Indenture will not limit  the amount of other
indebtedness or securities  which may be  issued by  the Company or  any of  its
subsidiaries.
 
CONVERSION RIGHTS
 
    The  Prospectus  Supplement relating  to  the Offered  Debt  Securities will
provide whether any Subordinated Debt Securities will be convertible into shares
of Common  Stock  at  any  time  on  or prior  to  the  maturity  date  of  such
Subordinated  Debt Securities  and if so  the initial conversion  price at which
such Subordinated  Debt Securities  will be  so convertible,  except that  if  a
Subordinated  Debt Security or portion thereof is earlier called for redemption,
the conversion  right  with respect  thereto  will  terminate at  the  close  of
business  on the  date fixed for  redemption and  will be lost  if not exercised
prior to that time. Fractional
 
                                       10
<PAGE>
shares of  Common  Stock will  not  be delivered  upon  conversion, but  a  cash
adjustment  will be paid  in respect of  such fractional interests  based on the
then current market price (as defined  in the Subordinated Indenture) of  Common
Stock on the last business day prior to the date of conversion.
 
    The  conversion price  will be  subject to  adjustment upon  certain events,
including (i) the issuance of Common Stock as a dividend or distribution on  the
Common  Stock;  (ii) subdivisions  or combinations  of  Common Stock;  (iii) the
issuance to all holders of Common  Stock of rights or warrants (expiring  within
60  days after the record date  for determining shareholders entitled to receive
them) entitling them to subscribe for or purchase Common Stock at less than  the
then  current market price (as defined  in the Subordinated Indenture); and (iv)
the distribution to  all holders of  Common Stock or  capital stock (other  than
Common  Stock),  evidences of  indebtedness  of the  Company,  assets (excluding
regular periodic cash dividends at a rate which is substantially consistent with
past practice, including past practice with respect to increases in  dividends),
or  rights or warrants  to subscribe for  or purchase securities  of the Company
(excluding the dividends, distributions, rights and warrants mentioned above).
 
    Subordinated Debt  Securities surrendered  for conversion  between a  record
date  for  payment of  interest and  the next  succeeding interest  payment date
(unless such  Subordinated  Debt  Securities  are subject  to  redemption  on  a
redemption  date in  that period)  must be accompanied  by payment  of an amount
equal to the interest thereon which is to be paid on such interest payment date.
Subject to  the  foregoing,  no  payments  or  adjustments  will  be  made  upon
conversion on account of accrued interest on the Subordinated Debt Securities or
for  any dividends or distributions on any shares of Common Stock delivered upon
conversion. No adjustment of the conversion price will be required to be made in
any case until cumulative adjustments amount  to one percent of such price.  The
Company  reserves the right to make such  reductions in the conversion price, in
addition to those required  in the foregoing provisions,  as the Company in  its
discretion  shall determine to be advisable  in order that certain stock-related
distributions hereafter made  by the Company  to its stockholders  shall not  be
taxable.
 
    Except  as stated above, the  conversion price will not  be adjusted for the
issuance of Common Stock, or any securities convertible into or exchangeable for
Common Stock or carrying the right to purchase any of the foregoing, in exchange
for cash, property or services.
 
    If at  any  time  the  Company  makes a  distribution  of  property  to  its
stockholders  which  would be  taxable to  such stockholders  as a  dividend for
federal income tax purposes (e.g. distributions of evidences of indebtedness  or
assets  of the Company but generally not  stock dividends or rights to subscribe
to  capital  stock)  and,  pursuant  to  the  antidilution  provisions  of   the
Subordinated Indenture, the conversion price of the Subordinated Debt Securities
is  reduced, such reduction may be deemed to be the receipt of taxable income by
holders of the Subordinated Debt Securities.
 
SUBORDINATION
 
    The Subordinated Debt  Securities will  rank PARI PASSU  with the  Company's
outstanding  7 1/2%  Convertible Subordinated Debentures  Due 2014,  but will be
subordinated and subject,  to the  extent and  in the  manner set  forth in  the
Subordinated  Indenture, in right of payment to the prior payment in full of all
Senior Debt  (as  defined  below)  of  the  Company.  No  payment  of  principal
(including  redemption  and  sinking  fund payments)  of,  premium,  if  any, or
interest on, the Subordinated Debt Securities may be made if any Senior Debt  is
not  paid when due, any applicable grace period with respect to such default has
ended and such default has not been cured  or waived, or if the maturity of  any
Senior Debt has been accelerated because of a default. During the continuance of
any other event of default with respect to Senior Debt for which maturity may be
accelerated  immediately and  if the  Subordinated Trustee  has received written
notice on behalf of holders of such Senior Debt, the Company may not for 90 days
from receipt of such notice do anything which would be prohibited (as set out in
the immediately  preceding sentence)  if  any Senior  Debt  has not  been  paid;
however,  if the maturity of  any such Senior Debt  is not accelerated within 90
days following  the due  date of  any  payments prevented  by such  default  and
notice,  the Company may resume payments on the Subordinated Debt Securities. If
payment of the Subordinated Debt Securities  is accelerated because of an  Event
of  Default, prompt  notice must  be given  to holders  of Senior  Debt, and the
Company may not pay the
 
                                       11
<PAGE>
Subordinated Debt Securities until 30 days after the acceleration occurs (Senior
Debt remaining  outstanding)  and  thereafter  may  pay  the  Subordinated  Debt
Securities  only  if  the  Subordinated Indenture  otherwise  permits.  Upon any
distribution of  assets  of  the  Company to  creditors  upon  any  dissolution,
winding-up,  liquidation or reorganization, whether  voluntary or involuntary or
in bankruptcy, insolvency, receivership or other proceedings, all principal  of,
and  premium, if any, and interest due or to become due on, all Senior Debt must
be paid  in full  before the  holders of  the Subordinated  Debt Securities  are
entitled  to receive  or retain any  payment. The  rights of the  holders of the
Subordinated Debt Securities will be subrogated to the rights of the holders  of
Senior Debt to receive payments or distributions applicable to Senior Debt until
all  amounts owing  on the  Subordinated Debt  Securities are  paid in  full. By
reason of  such subordination,  in the  event of  insolvency, creditors  of  the
Company  who are  holders of  Senior Debt  may recover  more, ratably,  than the
holders of the Subordinated  Debt Securities, and creditors  of the Company  who
are  not holders of Senior Debt or  the Subordinated Debt Securities may recover
less, ratably, than holders of Senior  Debt and may recover more, ratably,  than
the holders of the Subordinated Debt Securities.
 
    "Senior  Debt" will be  defined to mean  the principal of,  premium, if any,
interest on, and any other payment due pursuant to any of the following, whether
outstanding at the date of execution of the Subordinated Indenture or thereafter
incurred, created or assumed:
 
        (a) all indebtedness of  the Company for  money borrowed (including  any
    indebtedness  secured by  a mortgage  or other  lien which  is (i)  given to
    secure all  or part  of  the purchase  price  of property  subject  thereto,
    whether  given to the vendor of such property or to another or (ii) existing
    on property at the time of acquisition thereof);
 
        (b) all  indebtedness of  the Company  evidenced by  notes,  debentures,
    bonds or other securities sold by the Company for money;
 
        (c)  all lease obligations  of the Company which  are capitalized on the
    books of  the  Company  in accordance  with  generally  accepted  accounting
    principles;
 
        (d)  all indebtedness of others of the  kinds described in either of the
    preceding clauses (a) or (b) and all lease obligations of others of the kind
    described in the preceding clause (c) assumed by or guaranteed in any manner
    by the Company or in effect  guaranteed by the Company through an  agreement
    to purchase, contingent or otherwise;
 
        (e)  all obligations  of the Company  with respect to  letters of credit
    issued in connection with  indebtedness of others of  the kind described  in
    the preceding clauses (a) or (b) or leased obligations of the kind described
    in the preceding clause (c); and
 
        (f)  all renewals, extensions or refundings of indebtedness of the kinds
    described in any of the preceding clauses (a), (b) and (d), all renewals  or
    extensions  of lease  obligations of  the kinds  described in  either of the
    preceding clauses (c) and (d) and all renewals or extensions of  obligations
    with  respect to letters  of credit of  the kind described  in the preceding
    clause (e);
 
unless, in the case of  any particular indebtedness, lease obligation,  renewal,
extension,  refunding  or obligations  with respect  to  letters of  credit, the
instrument or  lease  creating or  evidencing  the  same or  the  assumption  or
guarantee  of  the  same  expressly  provides  that  such  indebtedness,  lease,
obligation, renewal, extension or refunding is not superior in right of  payment
to or is PARI PASSU with the Subordinated Debt Securities.
 
    At  September 30, 1995,  Senior Debt totalled  $1,120 million (not including
accrued interest).  The Subordinated  Indenture  does not  limit the  amount  of
Senior Debt which the Company may incur.
 
                          DESCRIPTION OF CAPITAL STOCK
 
    The  Company has 280,000,000  authorized shares of  stock, consisting of (i)
250,000,000 shares of Common Stock having a  par value of $1.00 per share,  (ii)
15,000,000 shares of Cumulative Preference Stock (Preference Stock) having a par
value  of $1.00 per share, and (iii) 15,000,000 shares of Preferred Stock having
a par value of $1.00  per share. At September  30, 1995, there were  104,421,176
shares of Common
 
                                       12
<PAGE>
Stock  outstanding. There are two series of Preference Stock designated, none of
which were outstanding at September 30, 1995. Of the Series A Preference  Stock,
120,000  shares were designated  and reserved for issuance  upon exercise of the
Stock Purchase Rights (Rights).  The Preferred Stock was  authorized by vote  of
the  shareholders on May 5, 1992 and  there are currently no shares of Preferred
Stock designated or outstanding. In addition, on September 30, 1995 the  Company
had  reserved for issuance 5,111,438 shares of Common Stock on conversion of the
outstanding 7 1/2 % Convertible  Subordinated Debentures Due 2014 and  2,842,842
shares of Common Stock upon the exercise of outstanding management options.
 
    The  following summary description of the Company's capital stock is subject
to  the  detailed   provisions  of   the  Company's   Restated  Certificate   of
Incorporation (Certificate), a copy of which has been filed as an exhibit to the
Registration Statement.
 
COMMON STOCK
 
    VOTING.  Each share of Common Stock entitles its record owner to one vote on
all  matters submitted to the stockholders  for action. The stockholders are not
entitled to cumulative voting rights in the election of directors.
 
    DIVIDENDS.  Subject  to the  rights of holders  of any  class of  Preference
Stock  or Preferred  Stock, the  holders of Common  Stock are  entitled to share
ratably in dividends in such amount as may be declared by the Company's Board of
Directors (Board) from time to time out of funds legally available therefor. The
payment of  dividends on  the Common  Stock is  restricted under  the  Company's
Revolving  Credit  and Term  Loan  Agreement to  no  more than  $1.20  per share
annually, and is prohibited in the event of a default.
 
    BUSINESS COMBINATIONS WITH INTERESTED STOCKHOLDERS.  The Company is  covered
by  Section 203 of  the Delaware General  Corporation Law which  provides that a
corporation shall not  engage in  any business combination  with an  "interested
stockholder"  for  a  period  of  three  years  following  the  date  that  such
stockholder became an interested stockholder unless  (1) prior to such date  the
board  of directors of the corporation  approved either the business combination
or the  transaction which  resulted in  the stockholder  becoming an  interested
stockholder,   (2)  upon  consummation  of   such  transaction,  the  interested
stockholder owned at  least 85 percent  of the voting  stock of the  corporation
outstanding  at the time, excluding certain  shares owned by directors, officers
and employees of  the corporation,  or (3)  on or  subsequent to  such date  the
business  combination is approved by the board  of directors and authorized at a
meeting of  stockholders by  the affirmative  vote of  the holders  of at  least
two-thirds   of  the  outstanding   voting  stock  other   than  the  interested
stockholder. "Interested stockholder" is defined as any person that is the owner
(by itself or with affiliates) of 15  percent or more of the outstanding  voting
stock of the corporation.
 
    FAIR  PRICE  PROVISION.    Under  the  Certificate,  a  business combination
involving the Company and a related person (defined as a holder of more than ten
percent of the voting stock of the Company) must provide that the price paid all
stockholders in  such a  transaction will  be at  least equal  in value  to  the
highest  price per share previously paid by  the related person in acquiring any
of its shares of voting stock unless such transactions has been approved by: (1)
holders of at least 75 percent of the outstanding shares of voting stock held by
shareholders other than  related persons;  or (2) two-thirds  of the  Continuing
Directors  (defined as the directors of the Company serving immediately prior to
the time the related person acquired  its ten percent interest). As a  practical
matter, if a business combination is not approved by the Continuing Directors, a
vote  of  75  percent  of  the  outstanding  shares  of  voting  stock  held  by
shareholders  other  than  the  related  persons  may  not  be  obtainable.  The
provisions  described in this paragraph may only be changed, amended, altered or
repealed by the affirmative vote of at least 75 percent of the votes entitled to
be cast by the stockholders.
 
    PREVENTION OF  GREENMAIL.    The  Certificate  prohibits  the  Company  from
purchasing  or agreeing to purchase any of  its equity securities, at a price in
excess of fair  market value, from  any holder of  five percent or  more of  any
class of voting stock (excluding any person who held such amounts on November 1,
1988  and who was also a holder of five percent of the outstanding shares of Sun
Company, Inc. common  stock on  July 6, 1988)  who has  beneficially owned  such
securities  for  less  than  two  years.  However,  such  a  transaction  may be
consummated if  approved by  holders of  at least  a majority  of the  Company's
voting stock, excluding
 
                                       13
<PAGE>
such  five percent holder. This stockholder approval requirement, however, would
not apply to any acquisition by the Company of its equity securities (i) as part
of a tender or exchange offer available  on the same terms to all other  holders
of  securities of  the same class  as such securities,  (ii) as part  of an open
market  purchase  program,  and  not  the  result  of  a  privately   negotiated
transaction,  or (iii) as the result of  the redemption of securities which have
terms providing for such redemption. The provisions described in this  paragraph
may  only be changed, amended, altered or repealed by the affirmative vote of at
least 75 percent of the votes entitled to be cast by the stockholders (excluding
any shares held by any holder of five percent or more of the Common Stock).
 
    BOARD OF  DIRECTORS.    The  Certificate provides  that  (i)  the  Board  is
classified into three classes, (ii) the number of directors comprising the Board
is  to be fixed from  time to time by  the Board at not  less than five nor more
than 11, which number is presently fixed  at nine, and (iii) the term of  office
of  each class expires in consecutive years so that only one class is elected in
each year.  The provisions  described in  this paragraph  may only  be  changed,
amended,  altered or repealed by the affirmative  vote of at least 75 percent of
the votes  entitled  to  be cast  by  the  stockholders. Because  the  Board  is
classified,   under  Section  141  of   the  Delaware  General  Corporation  Law
stockholders may remove directors only for cause.
 
    LIQUIDATION RIGHTS.  The holders of Common Stock are entitled to receive pro
rata the  assets of  the  Company legally  available  for distribution  to  such
stockholders upon liquidation or dissolution.
 
    OTHER.  The shares of Common Stock presently outstanding are, and any shares
of Common Stock to be offered under a Supplemental Prospectus to this Prospectus
will  be validly issued, fully  paid and nonassessable. The  Common Stock is not
redeemable and has no preemptive, exchange or conversion rights.
 
    TRANSFER AGENT  AND REGISTRAR.   The  Transfer Agent  and Registrar  of  the
Common Stock is Chemical Bank, New York, New York.
 
PREFERRED STOCK
 
    The  Board is authorized by the Certificate  to issue Preferred Stock in one
or more series and to fix for each such series such qualifications,  privileges,
limitations,  options, conversion rights, and other special rights as are stated
and adopted  by the  Board  and as  are permitted  by  the Certificate  and  the
Delaware General Corporation Law, including the designation and number of shares
issuable,  the dividend rate,  voting rights, conversion  rights, redemption and
sinking fund  provisions,  and  liquidation  values of  each  such  series.  The
particular  terms of any series of Offered  Preferred Stock will be set forth in
the Prospectus Supplement relating to such Offered Preferred Stock.
 
    Subject to  the rights  of holders  of any  class of  Preference Stock,  the
holders  of  Preferred Stock  are  entitled to  receive  dividends, when  and as
declared by the Board  out of funds  legally available for  that purpose. As  to
dividends  and rights upon liquidation, dissolution or winding up, the Preferred
Stock will rank  junior and subordinate  to any series  of Preference Stock  and
prior to the Common Stock.
 
PREFERENCE STOCK
 
    The  Board is authorized by the Certificate to issue Preference Stock in one
or more series and to fix for each such series such qualifications,  privileges,
limitations,  options, conversion rights, and other special rights as are stated
and adopted  by the  Board  and as  are permitted  by  the Certificate  and  the
Delaware General Corporation Law, including the designation and number of shares
issuable,  the dividend rate,  voting rights, conversion  rights, redemption and
sinking fund provisions, and liquidation values of each such series.
 
    Holders of Preference Stock are entitled to receive, when and as declared by
the Board out of  assets legally available for  that purpose, annual  cumulative
dividends payable in quarterly installments. Unless full cumulative dividends on
the  Preference Stock have been paid, no dividend may be declared or paid on, or
other distributions made  upon, Preferred  Stock or  Common Stock,  nor may  any
Preferred Stock or Common Stock be redeemed or purchased by the Company.
 
    Subject to certain conditions, the Company may redeem all or any part of the
Preference Stock then outstanding.
 
                                       14
<PAGE>
    If  the equivalent  of six quarterly  dividends on the  Preference Stock are
unpaid, the number of directors of the Company will be increased by two, and the
holders of the Preference Stock, voting as  a class, will be entitled to  select
the  additional two directors until  all dividends in arrears  have been paid or
declared and set aside for payment.  At such time, the additional two  directors
will  cease to serve as  directors and the number  of directors will decrease by
two.
 
    The affirmative  vote  or consent  of  holders  of at  least  two-thirds  of
outstanding  shares of Preference Stock is necessary for the Company to alter or
change certain preferences  or rights or  to create any  class of stock  ranking
prior to or on a parity with the Preference Stock.
 
    On  September  11, 1990,  the Company  issued 7,259,394  shares of  Series B
Preference Stock to an agent of the Glenmede Trust Company (Glenmede) as trustee
for various charitable trusts,  as partial consideration  for the repurchase  of
all  of  the Common  Stock  held by  Glenmede  for those  charitable  trusts. By
September 30, 1995, all shares of Series B Preference Stock outstanding had been
converted into  Common  Stock  on  a share-for-share  basis  by  the  holder  in
accordance with the terms thereof.
 
RIGHTS
 
    On  September 11,  1990, the Board  declared a dividend  distribution of one
Stock Purchase  Right  on  each  outstanding  share  of  Common  Stock,  payable
September  28, 1990 to holders  of record of the Common  Stock on that date. The
Rights are also issuable upon the issuance of additional shares of Common  Stock
prior  to the time  the Rights are  redeemed or expire.  Accordingly, the Rights
will also be  issued to  holders of  Common Stock  purchased in  an offering  of
Common   Stock  under  a  Prospectus   Supplement.  Initially,  the  Rights  are
represented by the certificates  for the Common Stock  and will trade only  with
the  Common  Stock. The  Rights will  expire September  11, 2000  unless earlier
redeemed by the Company. Unless the Rights are earlier redeemed, if the  Company
is (i) acquired in a merger or other business combination transaction or (ii) 50
percent  or more of the Company's assets or earning power is sold or transferred
or if a person or group (with  certain exceptions relating to affiliates of  the
Company)  acquires beneficial ownership of 20 percent or more of the outstanding
Common Stock (collectively,  Acquisition Events),  each Right  will entitle  its
holder  (other than  such a person  or group)  to purchase, at  the then current
exercise price, a number of shares  of the acquiring Company's common stock,  or
of the Common Stock of the Company, as the case may be, that would have a market
value  of twice the exercise  price. In addition, unless  the Rights are earlier
redeemed, if a person  or group is  determined by the  Board to have  intentions
toward  the Company that are not in  the long-term best interests of the Company
or the  Company's  stockholders  and  that  person  or  group  has  or  acquires
beneficial ownership of a percentage of common stock of the Company in excess of
the  ownership limitation  applicable to such  person or group  (which cannot be
less than 10 percent) as  set by the Board  (Triggering Event), each Right  will
entitle  its holder (other than  such person or group)  to purchase, at the then
current exercise price, a number  of shares of the  Common Stock of the  Company
that would have a market value equal to twice the exercise price multiplied by a
fraction,  the numerator of which is 20  percent and the denominator of which is
the applicable ownership limitation. Alternatively,  upon the occurrence of  the
foregoing,  the Company can, at its discretion, exchange the Rights for one-half
the number of shares for which the Rights would otherwise have been exercisable.
 
    With the approval of the Board  (but in certain circumstances only with  the
consent  of certain directors who were in office on September 10, 1990, or whose
nomination or election as a director was approved by such directors) the Company
can redeem the  Rights at any  time, at a  redemption price of  $.01 per  share,
subject  to  adjustment, before  the  occurrence of  an  Acquisition Event  or a
Triggering Event.
 
    The Rights  may  have  certain anti-takeover  effects.  However,  the  Board
believes  that the Rights  will assist in countering  takeover tactics the Board
deems unfair and enhance its ability to negotiate with any potential acquiror of
the Company.
 
                              PLAN OF DISTRIBUTION
 
    The Company may sell the Securities  being offered hereby in four ways:  (i)
through  agents,  (ii)  through  underwriters, (iii)  through  dealers  and (iv)
directly to certain purchasers.
 
                                       15
<PAGE>
    Offers to purchase Securities may be  solicited by agents designated by  the
Company  from  time  to  time. Any  such  agent,  who  may be  deemed  to  be an
underwriter as that term is defined in the Securities Act, involved in the offer
or sale of the Securities in respect of which this Prospectus is delivered, will
be named, and any commissions payable by the Company to such agent set forth, in
the  Prospectus  Supplement.  Unless  otherwise  indicated  in  the   Prospectus
Supplement, any such agent will be acting on a best efforts basis for the period
of its appointment. Agents may be entitled under agreements which may be entered
into  with the Company  to indemnification by the  Company against certain civil
liabilities, including liabilities under the Securities Act.
 
    If any underwriters are utilized in the sale, the Company will enter into an
underwriting agreement with such  underwriters at the time  of sale to them  and
the names of the underwriters and the terms of the transaction will be set forth
in  the Prospectus Supplement,  which will be  used by the  underwriters to make
resales of the Securities  in respect of which  this Prospectus is delivered  to
the  public. The underwriters  may be entitled,  under the relevant underwriting
agreement, to  indemnification  by  the  Company  against  certain  liabilities,
including  liabilities under  the Securities  Act, and  to reimbursement  by the
Company for certain expenses.
 
    If a dealer is utilized  in the sale of the  Securities in respect of  which
this  Prospectus  is delivered,  the Company  will sell  such Securities  to the
dealer, as principal. The dealer may  then resell such Securities to the  public
at varying prices to be determined by such dealer at the time of resale. Dealers
may  be entitled to indemnification by  the Company against certain liabilities,
including liabilities  under the  Securities Act,  and to  reimbursement by  the
Company for certain expenses.
 
    If  so indicated  in the Prospectus  Supplement, the  Company will authorize
agents and underwriters or  dealers to solicit offers  by certain purchasers  to
purchase  Offered Securities from  the Company at the  public offering price set
forth in  the  Prospectus  Supplement pursuant  to  delayed  delivery  contracts
providing  for payment  and delivery  on a  specified date  in the  future. Such
contracts will be subject to only  those conditions set forth in the  Prospectus
Supplement  and the Prospectus Supplement will  set forth the commission payable
for solicitation of such offers.
 
    Certain of the underwriters, agents or  dealers and their associates may  be
customers or engage in transactions with and perform services for the Company in
the ordinary course of business.
 
                                 LEGAL MATTERS
 
    The  validity of the Offered Securities will  be passed upon for the Company
by Akin, Gump, Strauss, Hauer  & Feld, L.L.P., New York,  New York, and for  any
underwriters,  dealers or agents  by Milbank, Tweed, Hadley  & McCloy, New York,
New York.
 
                            INDEPENDENT ACCOUNTANTS
 
    The consolidated balance sheets  as of December 31,  1994 and 1993, and  the
consolidated  statements  of income,  cash  flows and  changes  in shareholders'
equity for  each of  the three  years in  the period  ended December  31,  1994,
incorporated  by  reference in  this Prospectus,  have  been included  herein in
reliance on the  report of  Coopers & Lybrand  L.L.P., independent  accountants,
given on the authority of that firm as experts in auditing and accounting.
 
    With  respect to the unaudited interim financial information for the periods
ended June 30 and  March 31, 1995  and 1994, incorporated  by reference in  this
Prospectus,  the independent  accountants have  reported that  they have applied
limited procedures in  accordance with  professional standards for  a review  of
such  information.  However, their  separate reports  included in  the Company's
Quarterly Reports on Form 10-Q for  the six- and three-month periods ended  June
30  and March 31, 1995 and incorporated by reference herein, state that they did
not audit  and  they  do  not  express  an  opinion  on  the  interim  financial
information.  Accordingly,  the  degree of  reliance  on their  reports  on such
information should be restricted  in light of the  limited nature of the  review
procedures   applied.  The  accountants   are  not  subject   to  the  liability
 
                                       16
<PAGE>
provisions of  Section  11  of the  Securities  Act  for their  reports  on  the
unaudited  interim financial information because  such reports are not "reports"
or  "parts"  of  the  Registration  Statement  prepared  or  certified  by   the
accountants within the meaning of Section 7 and 11 of the Securities Act.
 
    Any  financial statements and schedules  hereafter incorporated by reference
in the Registration Statement of which this Prospectus is a part that have  been
audited  and are the subject  of a report by  independent accountants will be so
incorporated by reference in reliance upon  such reports and upon the  authority
of  such firms as  experts in accounting  and auditing to  the extent covered by
consents filed with the Commission.
 
                                       17
<PAGE>
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    NO  DEALER,  SALESPERSON OR  OTHER PERSON  HAS BEEN  AUTHORIZED TO  GIVE ANY
INFORMATION OR  TO MAKE  ANY  REPRESENTATION NOT  CONTAINED IN  THIS  PROSPECTUS
SUPPLEMENT  OR  THE  PROSPECTUS  AND,  IF GIVEN  OR  MADE,  SUCH  INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE  COMPANY
OR  ANY  UNDERWRITER.  THIS  PROSPECTUS SUPPLEMENT  AND  THE  PROSPECTUS  DO NOT
CONSTITUTE AN OFFER  TO SELL OR  A SOLICITATION OF  AN OFFER TO  BUY ANY OF  THE
SECURITIES  OFFERED  HEREBY IN  ANY JURISDICTION  TO  ANY PERSON  TO WHOM  IT IS
UNLAWFUL TO MAKE SUCH OFFER IN  SUCH JURISDICTION. NEITHER THE DELIVERY OF  THIS
PROSPECTUS SUPPLEMENT OR THE PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER
ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION HEREIN IS CORRECT
AS OF ANY TIME SUBSEQUENT TO DATE HEREOF OR THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE SUCH DATE.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                  PAGE
                                                ---------
<S>                                             <C>
                  PROSPECTUS SUPPLEMENT
The Company...................................        S-2
Use of Proceeds...............................        S-2
Recent Developments...........................        S-2
Description of Notes..........................        S-2
Underwriting..................................        S-3
Legal Matters.................................        S-4
 
                       PROSPECTUS
Available Information.........................          2
Incorporation of Documents by Reference.......          2
The Company...................................          3
Use of Proceeds...............................          3
Consolidated Ratio of Earnings to Fixed
 Charges......................................          3
Description of the Debt Securities............          3
Description of Capital Stock..................         12
Plan of Distribution..........................         15
Legal Matters.................................         16
Independent Accountants.......................         16
</TABLE>
 
                                  $150,000,000
 
                                     [LOGO]
                                  ORYX ENERGY
                                    COMPANY
                                  8 3/8% NOTES
                               DUE JULY 15, 2004
                            ------------------------
 
                             PROSPECTUS SUPPLEMENT
 
                            ------------------------
 
                             Chase Securities Inc.
                                 UBS Securities
                              BA Securities, Inc.
                              BZW Securities Inc.
                        NatWest Capital Markets Limited
                         Nesbitt Burns Securities Inc.
 
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