DEVON ENERGY CORP
424B1, 1999-09-22
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
                                               Filed Pursuant to Rule 424(b)(1)
                                                     Registration No. 333-86065


PROSPECTUS

                               9,900,000 Shares

                         Devon Energy Corporation Logo

                                 COMMON STOCK

                               ----------------

Devon Energy Corporation is offering 9,900,000 shares of its common stock.

                               ----------------

Our common stock is listed on the American Stock Exchange under the symbol
"DVN." On September 21, 1999, the reported last sale price of the common stock
on the American Stock Exchange was $40 1/2 per share.

                               ----------------

Investing in our common stock involves risks. See "Risk Factors" beginning on
page 14.

                               ----------------

                             PRICE $40 1/2 A SHARE

                               ----------------

<TABLE>
<CAPTION>
                                                      Underwriting
                                           Price to   Discounts and Proceeds to
                                            Public     Commissions     Devon
                                         ------------ ------------- ------------
<S>                                      <C>          <C>           <C>
Per Share...............................    $40.50        $1.52        $38.98
Total................................... $400,950,000  $15,048,000  $385,902,000
</TABLE>

The Securities and Exchange Commission and state securities regulators have
not approved or disapproved these securities, or determined if this prospectus
is truthful or complete. Any representation to the contrary is a criminal
offense.

Devon Energy Corporation has granted the underwriters the right to purchase up
to an additional 1,485,000 shares of common stock to cover over-allotments.
Morgan Stanley & Co. Incorporated expects to deliver the shares of common
stock to purchasers on September 27, 1999.

                               ----------------

MORGAN STANLEY DEAN WITTER
            J.P. MORGAN & CO.
                       PAINEWEBBER INCORPORATED
                                  BEAR, STEARNS & CO. INC.
                                                            SCHRODER & CO. INC.


September 21, 1999
<PAGE>


                      (This page intentionally left blank)

                                       2
<PAGE>

  You should rely only on the information contained in or incorporated by
reference in this prospectus. We have not authorized anyone to provide you with
different information. We are not making an offer of these securities in any
state where the offer is not permitted. You should not assume that the
information provided by this prospectus is accurate as of any date other than
the date on the front of this prospectus.

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
About This Prospectus....................................................   3
Prospectus Summary.......................................................   4
Risk Factors.............................................................  14
  Risks Relating to the Oil and Gas Industry.............................  14
  Risks Relating to an Investment in Devon...............................  15
  Risks Relating to the Recent Merger with PennzEnergy...................  15
Use of Proceeds..........................................................  18
Capitalization...........................................................  19
Market Price Data........................................................  20
Unaudited Pro Forma Financial Information................................  21
Notes to Unaudited Pro Forma Financial Information.......................  25
Properties of Devon......................................................  30
Directors and Executive Officers of Devon................................  33
Certain United States Federal Tax Considerations to Non-United States
 Holders.................................................................  35
Underwriters.............................................................  38
Legal Matters............................................................  40
Experts..................................................................  40
Where You Can Find More Information......................................  40
Cautionary Statement Concerning Forward-Looking Statements...............  42
Commonly Used Oil and Gas Terms..........................................  43
</TABLE>

                             ABOUT THIS PROSPECTUS

  This prospectus provides you with a general description of our common stock
which we are offering. You should read this prospectus together with the
additional information described under the heading "Where You Can Find More
Information" on page 40.

  In this prospectus, the terms "Devon", "we", "us" and "our" generally mean
Devon Energy Corporation, a Delaware corporation, and its consolidated
subsidiaries. Some references to Devon in this prospectus are made as of a time
or period before the PennzEnergy merger. Those references to Devon mean, unless
the context otherwise requires, our predecessor company before the PennzEnergy
merger. The predecessor company became a wholly-owned subsidiary of Devon in
the PennzEnergy merger.

  Unless otherwise indicated, all dollar amounts in this prospectus are
expressed in U.S. dollars.

                                       3
<PAGE>

                               PROSPECTUS SUMMARY

  This summary highlights selected information from this prospectus. It may not
contain all of the information that is important to you. You should read the
summary together with the more detailed information about Devon and the common
stock being sold in this offering in the rest of this prospectus and the
documents to which we have referred you. See "Where You Can Find More
Information" on page 40.

Devon

  Devon is an independent oil and gas company engaged in the acquisition,
exploration, exploitation and development of prospective and proved oil and gas
properties, and the production and sale of crude oil, condensate, natural gas
and natural gas liquids. On August 17, 1999, we completed our merger with
PennzEnergy Company. We believe that Devon now ranks solidly in the top ten of
all U.S.-based independent oil and gas producers in terms of market
capitalization, total proved reserves and annual production.

  The following references to our oil and gas reserves and properties are on a
pro forma basis as if the merger was completed on December 31, 1998. As of
December 31, 1998, we had proved oil and gas reserves of approximately 660
million barrels of oil equivalent. Approximately 52% of these reserves were
natural gas and 48% were oil and natural gas liquids. Approximately 64% of the
proved reserves, or 422 million equivalent barrels, were located in the United
States. These reserves were concentrated in four primary operating areas: the
Permian Basin, the Rocky Mountain Region, the Gulf Coast/East Texas Region and
the Offshore Gulf of Mexico. Approximately 22% of the combined reserves, or 144
million equivalent barrels, were located in the Western Canadian Sedimentary
Basin. The balance of proved reserves, approximately 94 million equivalent
barrels, was located outside North America, primarily in Azerbaijan. In
addition to the proved oil and gas properties, we had a substantial inventory
of exploration acreage totaling approximately 15 million acres as of the end of
1998.

  We have significant expertise with regard to various oilfield technologies,
including coal bed methane extraction, enhanced oil recovery, deep onshore
natural gas drilling, shallow water offshore drilling and other exploration,
production and processing technologies. We also have significant international
operations and experience in Canada and outside North America. We believe our
property base and expertise give us the ability to acquire, explore for,
develop and exploit oil and natural gas reserves domestically both onshore and
offshore, as well as internationally.

  The "Risk Factors" section of this prospectus, beginning on page 14,
discusses potential risks associated with an investment in Devon. You should
consider these potential risks before you decide to invest in the common stock
offered by this prospectus. The prospectus incorporates by reference detailed
information about the merger contained in the merger proxy statement. To
request a copy of the merger proxy statement, see "Where You Can Find More
Information" on page 40 of this prospectus.

   Our principal executive offices are located at 20 North Broadway, Suite
1500, Oklahoma City, Oklahoma 73102-8260. Our telephone number at that location
is (405) 235-3611.

Strategy

  Our primary objectives are to build reserves, production, cash flow and
earnings per share by acquiring oil and gas properties, exploring for new oil
and gas reserves and seeking optimal production from existing oil and gas
properties. Our management seeks to achieve these objectives by:

                                       4
<PAGE>


  . concentrating our properties in core areas to achieve economies of scale,

  . acquiring and developing high profit margin properties,

  . continually disposing of marginal and non-strategic properties,

  . balancing reserves and production between oil and gas, and

  . keeping debt levels reasonable.

  Through our predecessors, we began operations in 1971 as a privately held
company. During 1988, we expanded our capital base by issuing common stock to
the public for the first time. This transaction began a substantial expansion
program that has continued through the years. We have used a two-pronged
strategy of acquiring producing properties and engaging in drilling activities
to achieve this expansion. Approximately two-thirds of our total capital spent
during this period was for property acquisitions and one-third was for
drilling. Total proved reserves increased from 8.1 million barrels of oil
equivalent at the end of 1987 to 660 million pro forma barrels of oil
equivalent at the end of 1998.

  Our objective is to increase value per share, in addition to increasing total
assets. Reserves have grown from 1.31 barrels of oil equivalent per diluted
share at the end of 1987 to 8.83 pro forma barrels of oil equivalent per
diluted share at the end of 1998. At the same time, our net debt, or long-term
debt less working capital, has remained relatively low. At the end of 1998, our
pro forma net debt was $2.10 per barrel of oil equivalent. This number excludes
$742.4 million of debentures which are exchangeable for shares of Chevron
Corporation common stock owned by Devon.

Our merger with Northstar

  On December 10, 1998, we completed a merger with Canadian-based Northstar
Energy Corporation. The merger was accounted for under the "pooling of
interests" method of accounting and Northstar became our subsidiary.
Northstar's properties are located primarily in the Western Canada Sedimentary
Basin in Alberta. Through the merger, we expanded our reserves by approximately
115 million barrels of oil equivalent, or by 62% at the time, and nearly
tripled our undeveloped leasehold inventory. In addition, we retained the
experienced Northstar management team to continue to direct our Canadian
operations.

  Our merger with Northstar placed us in a unique position to take advantage of
growth opportunities both in the United States and in Canada. With 64% of our
pro forma proved reserves in the United States and 22% in Canada, we have
considerable exposure to growing North American natural gas markets, while
retaining substantial oil reserves, particularly in the Permian Basin of the
United States. In addition, we own a large inventory of acreage and have the
financial flexibility to pursue the opportunities for drilling on this acreage.

  As part of the Northstar merger consideration, we issued, through Northstar,
16.1 million exchangeable shares. These shares are exchangeable at any time, on
a one-for-one basis, for shares of our common stock. The exchangeable shares
are essentially equivalent to our common stock, but, because they were issued
by Northstar, they qualify as a domestic Canadian investment for Canadian
institutional stockholders. The exchangeable shares trade on The Toronto Stock
Exchange under the symbol "NSX." Our common stock trades on the American Stock
Exchange under the symbol "DVN."


                                       5
<PAGE>


The Offering

<TABLE>
<S>                                   <C>
Common stock offered................  9,900,000 shares (1)

Common stock to be outstanding after
 the offering.......................  80,375,008 shares (1)(2)

Over-allotment option...............  1,485,000 shares

Use of proceeds.....................  The proceeds will be used to reduce long-
                                      term debt.
</TABLE>
- --------
(1) Assuming the underwriters do not exercise the over-allotment option granted
    by us to purchase up to 1,485,000 additional shares in this offering.
(2) Based on the number of shares actually outstanding as of September 21,
    1999. This number includes 4,815,224 shares issuable upon the exchange of
    all of our outstanding Northstar exchangeable shares. This number excludes
    (a) 4,901,503 shares issuable upon the conversion of all our outstanding
    trust convertible preferred securities, (b) shares subject to outstanding
    options or reserved for issuance under our employee benefit plans, and (c)
    the exercise of the over-allotment option by the underwriters.

                                       6
<PAGE>

Summary Unaudited Pro Forma Financial and Other Information

  The following unaudited pro forma financial information has been prepared to
assist in your analysis of the financial effects of this offering of additional
Devon common stock and the PennzEnergy merger. This pro forma information is
based on the historical financial statements of Devon and PennzEnergy.

  The information was prepared based on the following:

  .  The assumed net proceeds from this offering of 9.9 million common shares
     are $385.2 million. This is based on an offering price of $40.50 per
     share, less $15.8 million for the underwriting discount and other
     estimated offering costs and expenses.

  .  Devon utilizes the full cost method of accounting for its oil and gas
     activities.

  .  The PennzEnergy merger was accounted for as a purchase of PennzEnergy by
     Devon.

  .  Targeted annual general and administrative expense and lease operating
     expense savings from the merger of $50 to $60 million have not been
     reflected as an adjustment to the historical data. These cost savings
     are expected to result from the consolidation of the corporate
     headquarters of Devon and PennzEnergy and the elimination of duplicate
     staff and expenses.

  .  As of June 30, 1999, the merger did not cause a pro forma reduction of
     the carrying value of oil and gas properties under the full cost
     accounting "ceiling test." The June 30, 1999 ceiling test was calculated
     based on a posted West Texas Intermediate oil price of $16.50 per barrel
     and a Texas Gulf Coast index gas price of $2.14 per Mcf. However, the
     pro forma ceiling "cushion" as of June 30, 1999, in Devon's non-Canadian
     cost centers was less than $20 million. Therefore, future reductions in
     oil and gas prices or changes to the preliminary allocation of the
     purchase price of PennzEnergy's oil and gas properties could cause a
     reduction of the carrying value to be recorded as of September 30, 1999,
     or in subsequent periods.

  No pro forma adjustments have been made with respect to the following unusual
items. These items are reflected in the historical results of Devon or
PennzEnergy, as applicable, and should be considered when making period-to-
period comparisons:

  .  In 1998, PennzEnergy realized pretax gains on the sale and exchange of
     Chevron Corporation common stock of $230.1 million. The summary
     unaudited pro forma operations data does not include the $207.0 million
     after-tax extraordinary loss resulting from the early extinguishment of
     related debentures exchangeable for such common stock.

  .  In 1998, PennzEnergy incurred $24.3 million of nonrecurring general and
     administrative expenses in connection with the spin-off of Pennzoil-
     Quaker State Company on December 30, 1998.

  .  In 1998, Devon incurred $13.1 million of nonrecurring expenses related
     to the merger with Northstar.

  .  In 1998, Devon reduced the carrying value of its oil and gas properties
     by $126.9 million ($88.0 million after-tax) due to the full cost ceiling
     limitation.

  .  In the second quarter of 1999, PennzEnergy recognized a gain of $46.7
     million ($29.8 million after-tax) from the sale of land, timber and
     mineral rights in Pennsylvania and New York.

  The unaudited pro forma information is presented for illustrative purposes
only. If this offering of additional Devon common stock and the PennzEnergy
merger had occurred in the past, Devon's financial position or operating
results might have been different from those presented in the unaudited pro
forma information. You should not rely on the unaudited pro forma information
as an indication of the financial position or operating results that Devon
would have achieved if this offering and the merger had occurred on June 30,
1999, or January 1, 1998. You also should not rely on the unaudited pro forma
information as an indication of the future results that Devon will achieve
after this offering and the merger.

                                       7
<PAGE>

<TABLE>
<CAPTION>
                                                   As of June 30, 1999
                                             ----------------------------------
                                                         Devon Pro Forma With
                                                            the PennzEnergy
                                                                Merger
                                                         ----------------------
                                                          Without
                                               Devon        the       With the
                                             Historical   Offering    Offering
                                             ----------  ----------  ----------
                                             (In Thousands, Except Per Share
                                                          Data)
<S>                                          <C>         <C>         <C>
Balance Sheet Data:
  Investment in common stock of Chevron
   Corporation (see note 4 on page 27).....  $       --  $  674,224  $  674,224
  Total assets.............................   1,305,163   4,733,482   4,733,482
  Debentures exchangeable into shares of
   Chevron Corporation common stock (see
   note 4 on page 27)......................          --     775,519     775,519
  Other long-term debt.....................     448,013   1,390,242   1,005,078
  Convertible preferred securities of
   subsidiary trust........................     149,500     149,500     149,500
  Stockholders' equity.....................     555,240   1,431,539   1,816,703
  Book value per share.....................       11.37       20.36       22.65

<CAPTION>
                                               Year Ended December 31, 1998
                                             ----------------------------------
                                                         Devon Pro Forma With
                                                            the PennzEnergy
                                                                Merger
                                                         ----------------------
                                                          Without
                                               Devon        the       With the
                                             Historical  Offering     Offering
                                             ----------  ----------  ----------
                                             (In Thousands, Except Per Share
                                                          Data)
<S>                                          <C>         <C>         <C>
Operations Data:
 Operating Results
   Oil sales...............................  $  143,624  $  302,918  $  302,918
   Gas sales...............................     209,344     553,938     553,938
   NGL sales...............................      16,692      63,703      63,703
   Other revenue...........................      17,848     295,803     295,803
                                             ----------  ----------  ----------
     Total revenue.........................     387,508   1,216,362   1,216,362
                                             ----------  ----------  ----------
   Lease operating expenses................     113,484     294,739     294,739
   Production taxes........................      13,916      28,148      28,148
   Depreciation, depletion and
    amortization...........................     123,844     510,064     510,064
   General and administrative expenses.....      23,544     139,378     139,378
   Northstar combination expenses..........      13,149      13,149      13,149
   Interest expense........................      22,632     176,659     139,449
   Deferred effect of changes in foreign
    currency exchange rate on subsidiary's
    long-term debt.........................      16,104      16,104      16,104
   Distributions on preferred securities of
    subsidiary trust.......................       9,717       9,717       9,717
   Reduction of carrying value of oil and
    gas properties.........................     126,900     126,900     126,900
                                             ----------  ----------  ----------
     Total costs and expenses..............     463,300   1,314,858   1,277,648
                                             ----------  ----------  ----------
   Loss before income taxes................     (75,792)    (98,496)    (61,286)
   Income tax expense (benefit):
     Current...............................       7,687      10,324      10,324
     Deferred..............................     (23,194)    (28,198)    (14,058)
                                             ----------  ----------  ----------
      Total income tax expense.............     (15,507)    (17,874)     (3,734)
                                             ----------  ----------  ----------
   Net loss................................     (60,285)    (80,622)    (57,552)
   Preferred stock dividends...............          --       5,625       5,625
                                             ----------  ----------  ----------
   Net loss applicable to common
    shareholders...........................  $  (60,285) $  (86,247) $  (63,177)
                                             ==========  ==========  ==========
   Net loss per share--basic and diluted...       (1.25)      (1.24)      (0.79)
   Cash dividends per share................        0.15        0.17        0.17
   Weighted average common shares
    outstanding............................      48,376      69,729      79,629
 Cash Flow Data
   Net cash provided by operating
    activities.............................  $  191,571  $  388,992  $  426,202
   Net cash used in investing activities...    (271,960)   (222,959)   (222,959)
   Net cash provided (used) by financing
    activities.............................      57,618    (143,300)   (145,280)
   Modified EBITDA.........................     223,405     740,948     740,948
   Cash margin.............................     183,369     544,248     581,458
</TABLE>

                                       8
<PAGE>

<TABLE>
<CAPTION>
                                                   Year Ended December 31, 1998
                                                   ----------------------------
                                                               Devon Pro Forma
                                                                  With the
                                                                 PennzEnergy
                                                                   Merger
                                                              -----------------
                                                              Without
                                                     Devon      the    With the
                                                   Historical Offering Offering
                                                   ---------- -------- --------
<S>                                                <C>        <C>      <C>
Production, Price and Other Data
 Production:
   Oil (MBbls)....................................    11,903    26,128   26,128
   Gas (MMcf).....................................   133,065   303,693  303,693
   NGL (MBbls)....................................     1,939     7,128    7,128
   MBoe ..........................................    36,020    83,872   83,872
 Average prices:
   Oil (per Bbl)..................................  $  12.07  $  11.59 $  11.59
   Gas (per Mcf)..................................      1.57      1.82     1.82
   NGL (per Bbl)..................................      8.61      8.94     8.94
   Per Boe........................................     10.26     10.98    10.98
 Costs per Boe:
   Operating costs................................      3.54      3.85     3.85
   Depreciation, depletion and amortization of oil
    and gas properties............................      3.32      6.02     6.02
   General and administrative expenses............      0.65      1.66     1.66
</TABLE>

<TABLE>
<CAPTION>
                                                   As of December 31, 1998
                                               --------------------------------
                                                           Devon Pro Forma With
                                                             the PennzEnergy
                                                                 Merger
                                                          ---------------------
                                                           Without
                                                 Devon       the      With the
                                               Historical  Offering   Offering
                                               ---------- ---------- ----------
<S>                                            <C>        <C>        <C>
Property Data
 Proved reserves:
   Oil (MBbls)................................     83,457    272,688    272,688
   Gas (MMcf).................................  1,198,894  2,050,528  2,050,528
   NGL (MBbls)................................     16,079     45,654     45,654
   Total (MBoe)...............................    299,351    660,096    660,096
   SEC 10% present value (thousands).......... $1,009,039 $2,087,666 $2,087,666
   Standardized measure of discounted future
    net cash flows (thousands)................    931,588  1,816,542  1,816,542
</TABLE>

                                       9
<PAGE>

<TABLE>
<CAPTION>
                                               Six Months Ended June 30, 1999
                                               --------------------------------
                                                             Devon Pro Forma
                                                                With the
                                                           PennzEnergy Merger
                                                           --------------------
                                                            Without
                                                 Devon        the     With the
                                               Historical  Offering   Offering
                                               ----------  ---------  ---------
                                                 (In Thousands, Except Per
                                                        Share Data)
<S>                                            <C>         <C>        <C>
Operations Data:
 Operating Results
   Oil sales.................................. $  64,784   $ 149,898  $ 149,898
   Gas sales..................................   112,938     263,822    263,822
   NGL sales..................................     9,764      28,496     28,496
   Other revenue..............................     4,092      65,654     65,654
                                               ---------   ---------  ---------
     Total revenue............................   191,578     507,870    507,870
                                               ---------   ---------  ---------
   Lease operating expenses...................    54,520     130,996    130,996
   Production taxes...........................     6,415      13,179     13,179
   Depreciation, depletion and amortization...    69,321     247,368    247,368
   General and administrative expenses........    13,175      57,895     57,895
   Interest expense...........................    13,779      74,232     55,627
   Deferred effect of changes in foreign
    currency exchange rate on subsidiary's
    long-term debt............................    (8,746)     (8,746)    (8,746)
   Distributions on preferred securities of
    subsidiary trust..........................     4,859       4,859      4,859
                                               ---------   ---------  ---------
     Total costs and expenses.................   153,323     519,783    501,178
                                               ---------   ---------  ---------
   Earnings (loss) before income taxes........    38,255     (11,913)     6,692
   Income tax expense (benefit):
    Current...................................     4,302       4,268      4,268
    Deferred..................................    11,764      (8,057)      (988)
                                               ---------   ---------  ---------
     Total income tax expense (benefit).......    16,066      (3,789)     3,280
                                               ---------   ---------  ---------
   Net earnings (loss)........................    22,189      (8,124)     3,412
   Preferred stock dividends..................        --       4,868      4,868
                                               ---------   ---------  ---------
   Net earnings (loss) applicable to common
    shareholders.............................. $  22,189   $ (12,992) $  (1,456)
                                               =========   =========  =========
   Net earnings (loss) per share--basic and
    diluted...................................      0.46       (0.19)     (0.02)
   Cash dividends per share...................      0.10        0.10       0.10
   Weighted average common shares
    outstanding...............................    48,575      70,021     79,921
 Cash Flow Data
   Net cash provided by operating activities.. $  85,911   $ 107,508  $ 126,113
   Net cash used in investing activities......  (134,419)   (172,599)  (172,599)
   Net cash provided by financing activities..    43,281      53,188     52,198
   Modified EBITDA............................   117,468     305,800    305,800
   Cash margin................................    94,528     223,441    241,046
</TABLE>

                                       10
<PAGE>

<TABLE>
<CAPTION>
                                                    Six Months Ended June 30,
                                                               1999
                                                   ----------------------------
                                                               Devon Pro Forma
                                                                  With the
                                                                 PennzEnergy
                                                                   Merger
                                                              -----------------
                                                              Without
                                                     Devon      the    With the
                                                   Historical Offering Offering
                                                   ---------- -------- --------
<S>                                                <C>        <C>      <C>
Production, Price and Other Data
 Production:
   Oil (MBbls)....................................    5,071    11,962   11,962
   Gas (MMcf).....................................   71,402   153,452  153,452
   NGL (MBbls)....................................      991     3,271    3,271
   MBoe ..........................................   17,962    40,808   40,808
 Average prices:
   Oil (per Bbl)..................................   $12.78   $ 12.53  $ 12.53
   Gas (per Mcf)..................................     1.58      1.72     1.72
   NGL (per Bbl)..................................     9.85      8.71     8.71
   Per Boe........................................    10.44     10.84    10.84
 Costs per Boe:
   Operating costs................................     3.39      3.53     3.53
   Depreciation, depletion and amortization of oil
    and gas properties............................     3.75      6.00     6.00
   General and administrative expenses............     0.73      1.42     1.42
</TABLE>

                                       11
<PAGE>

Summary Historical Selected Financial and Production Data

  The following selected financial information (not covered by the independent
auditors' reports) for the fiscal years has been derived from Devon's audited
consolidated financial statements. The following information for the interim
periods has been derived from Devon's unaudited financial statements.

<TABLE>
<CAPTION>
                                                                 Six Months
                             Year Ended December 31,           Ended June 30,
                         ---------------------------------  ---------------------
                            1996       1997        1998        1998       1999
                         ---------- ----------  ----------  ---------- ----------
                                 (In Thousands, Except Per Share Data)
<S>                      <C>        <C>         <C>         <C>        <C>
Balance Sheet Data:
  Total assets.......... $1,183,290 $1,248,986  $1,226,356  $1,295,766 $1,305,163
  Long-term debt........     83,000    305,337     405,271     302,315    448,013
  Convertible preferred
   securities of
   subsidiary trust.....    149,500    149,500     149,500     149,500    149,500
  Stockholders' equity..    678,772    596,546     522,963     617,847    555,240
Statement of Operations
 Data:
  Oil sales.............    136,023    207,725     143,624      75,573     64,784
  Gas sales.............    101,443    219,459     209,344     106,555    112,938
  NGL sales.............     19,299     24,920      16,692       9,687      9,764
  Other revenue.........     34,570     47,555      17,848      13,397      4,092
                         ---------- ----------  ----------  ---------- ----------
      Total revenues....    291,335    499,659     387,508     205,212    191,578
                         ---------- ----------  ----------  ---------- ----------
  Lease operating
   expenses.............     58,734    100,897     113,484      57,679     54,520
  Production taxes......     10,880     19,227      13,916       7,266      6,415
  Depreciation,
   depletion and
   amortization.........     70,307    169,108     123,844      61,158     69,321
  General and
   administrative
   expenses.............     15,111     24,381      23,554      11,784     13,175
  Northstar Combination
   expenses.............         --         --      13,149          --         --
  Interest expense......     12,662     18,788      22,632      10,837     13,779
  Deferred effect of
   changes in foreign
   currency exchange
   rate on subsidiary's
   long-term debt.......        199      5,860      16,104       6,921     (8,746)
  Distributions on
   preferred securities
   of subsidiary trust..      4,753      9,717       9,717       4,859      4,859
  Reduction of carrying
   value of oil and gas
   properties...........         --    625,514     126,900          --         --
                         ---------- ----------  ----------  ---------- ----------
  Total costs and
   expenses.............    172,646    973,492     463,300     160,504    153,323
                         ---------- ----------  ----------  ---------- ----------
 Earnings (loss) before
  income taxes..........    118,689   (473,833)    (75,792)     44,708     38,255
 Income tax expense
  (benefit):
   Current..............      7,834     26,857       7,687       5,331      4,302
   Deferred.............     43,252   (200,699)    (23,194)     12,979     11,764
                         ---------- ----------  ----------  ---------- ----------
     Total..............     51,086   (173,842)    (15,507)     18,310     16,066
                         ---------- ----------  ----------  ---------- ----------
   Net earnings (loss).. $   67,603 $ (299,991) $  (60,285) $   26,398 $   22,189
                         ========== ==========  ==========  ========== ==========
   Net earnings (loss)
    per share:
     Basic.............. $     2.06 $    (6.38) $    (1.25) $     0.55 $     0.46
     Diluted............       1.99      (6.38)      (1.25)       0.55       0.46
   Cash dividends per
    common share........       0.15       0.14        0.15        0.07       0.10
   Weighted average
    common shares
    outstanding--basic..     32,812     47,040      48,376      48,338     48,575
</TABLE>

                                       12
<PAGE>


<TABLE>
<CAPTION>
                                                                 Six Months
                             Year Ended December 31,           Ended June 30,
                         ----------------------------------  -------------------
                            1996        1997        1998       1998      1999
                         ----------  ----------  ----------  --------  ---------
                         (In Thousands, Except Per Share and Per Unit Data)
<S>                      <C>         <C>         <C>         <C>       <C>
Cash Flow Data:
  Net cash provided by
   operating
   activities........... $  144,248  $  253,056  $  191,571  $102,832  $  85,911
  Net cash used by
   investing
   activities...........   (243,451)   (147,583)   (271,960)  (74,988)  (134,419)
  Net cash provided
   (used) by financing
   activities...........     96,420     (77,141)     57,618   (47,111)    43,281
  Modified EBITDA.......    206,610     355,154     223,405   128,483    117,468
  Cash margin...........    181,361     299,792     183,369   107,456     94,528
Production, Price and
 Other Data:
  Production:
    Oil (MBbls).........      6,780      11,783      11,903     6,105      5,071
    Gas (MMcf)..........     62,186     121,810     133,065    66,662     71,402
    NGL (MBbls).........      1,255       1,891       1,939     1,043        991
    MBoe................     18,399      33,976      36,020    18,258     17,962
  Average prices:
    Oil (Per Bbl)....... $    20.06  $    17.63  $    12.07  $  12.38  $   12.78
    Gas (Per Mcf).......       1.63        1.80        1.57      1.60       1.58
    NGL (Per Bbl).......      15.38       13.18        8.61      9.29       9.85
    Per Boe.............      13.96       13.31       10.26     10.51      10.44
  Costs per Boe:
    Operating costs.....       3.78        3.54        3.54      3.56       3.39
    Depreciation,
     depletion and
     amortization of oil
     and gas
     properties.........       3.69        4.86        3.32      3.24       3.75
    General and
     administrative
     expenses...........       0.82        0.72        0.65      0.65       0.73

<CAPTION>
                                As of December 31,
                         ----------------------------------
                            1996        1997        1998
                         ----------  ----------  ----------
<S>                      <C>         <C>         <C>
Property Data:
  Proved reserves:
    Oil (MBbls).........     80,155      97,041      83,457
    Gas (MMcf)..........    898,319   1,150,604   1,198,894
    NGL (MBbls).........     14,190      17,178      16,079
    Total (MBoe)........    244,065     305,986     299,351
    SEC 10% present
     value (thousands).. $1,999,748  $1,340,644  $1,009,039
    Standardized measure
     of discounted
     future net cash
     flows (thousands)..  1,454,974   1,100,676     931,588
</TABLE>

                                       13
<PAGE>

                                  RISK FACTORS

  You should carefully consider the following factors, in addition to the other
information contained or incorporated by reference in this prospectus, before
deciding to invest in our common stock.

                   Risks Relating to the Oil and Gas Industry

Our results depend on oil and gas prices, which are volatile and beyond our
control

  Our revenues, results of operations and financial condition depend largely on
the prices we receive for our oil and gas production. Extended periods of low
prices could adversely affect the ultimate return on past investments. Our
ability or willingness to continue or complete our current and planned drilling
programs and acquisitions may also be affected.

Our calculations of proved reserves are only estimates

  Many uncertainties exist when estimating quantities of oil and gas reserves.
The estimates of future net cash flows from our proved reserves and their
present value are based on assumptions about future production levels, prices
and costs that may prove to be inaccurate. Our estimated reserves may be
subject to upward or downward revision based upon our production, results of
future exploration and development, prevailing oil and gas prices, operating
and development costs and other factors.

Our exploration, development and acquisition activities might not result in
significant additional reserves

  The rate of production from oil and gas properties generally declines as
reserves are depleted. Our proved reserves will decline materially as oil and
gas are produced unless we acquire additional properties with proved reserves,
conduct successful exploration and development activities or our reserve
estimates increase. Our future oil and gas production depends on our success in
acquiring or finding additional reserves.

Potential hazards could damage or destroy our oil and gas wells or production
facilities or damage or injure property, persons and the environment

  The exploration for and production of oil and gas can be hazardous, involving
natural disasters, blowouts, cratering, fires and losses of well control. These
hazards can damage or destroy oil and gas wells and production facilities,
injure or kill people and cause damage to property and the environment. We
maintain insurance against many potential losses and liabilities in accordance
with customary industry practices, however our insurance does not protect us
against all operational risks.

Government regulations, including environmental regulations, may adversely
affect our results

  Our exploration and production operations are regulated at the federal, state
and local levels in the United States as well as by governments in other
countries. We make large expenditures to comply with the requirements of these
regulations. Future changes in the regulation of the oil and gas industry could
significantly increase these costs.

  We are subject to various federal, state, local and foreign regulations
relating to the protection of the environment. We may be liable for the cost to
clean-up pollution resulting from our operations and for the cost of pollution
damages. We also may be required to suspend or cease operations in affected
areas. Additional future regulations for the protection of the environment
could adversely affect our operations and results.

                                       14
<PAGE>

                    Risks Relating to an Investment in Devon

Devon has charter and other provisions that may make it difficult to cause a
change of control

  Some provisions of Devon's certificate of incorporation and by-laws and of
the Delaware General Corporation Law, as well as Devon's stockholder rights
plan, may make it difficult for stockholders to cause a change in control of
Devon and replace incumbent management. These provisions include:

  .  a classified board, the members of which serve staggered three-year
     terms and may be removed by stockholders only for cause;

  .  a prohibition on stockholders calling special meetings and acting by
     written consent; and

  .  rights issued under its rights plan, which would "flip in" if a hostile
     bidder acquired 15% of Devon's common stock.

The interest of Devon's largest stockholder may conflict with the interests of
Devon's other stockholders

  Kerr-McGee Corporation currently owns 9,954,000 shares, or 14.1%, of our
outstanding Devon common stock. After completion of this offering, assuming the
underwriters do not exercise the over-allotment option, Kerr-McGee would own
approximately 12.4% of our common stock. On August 2, 1999, Kerr-McGee
completed an offering of exchangeable notes which are due on August 2, 2004.
These notes are exchangeable into the Devon common shares owned by Kerr-McGee
or, at Kerr-McGee's option, the cash equivalent of the value of such Devon
common shares.

  As a substantial stockholder, Kerr-McGee may have the power to influence the
outcome of matters submitted to a vote of the Devon stockholders. Kerr-McGee's
interests may not reflect the interests of other stockholders. Devon and Kerr-
McGee have not implemented any specific procedures to deal with conflicts that
may arise in the future between Kerr-McGee's interests and those of other Devon
stockholders. In the event a conflict arises, we will implement procedures we
deem appropriate to deal with the specific situation.


              Risks Relating to the Recent Merger with PennzEnergy

We may not successfully integrate the operations of Devon and PennzEnergy or
achieve the benefits we are seeking

  The success of the merger will partially depend upon the integration of the
management and operations of Devon and PennzEnergy. Our management team does
not have experience with the combined businesses of Devon and PennzEnergy.
Devon may not be able to integrate the operations of PennzEnergy without losing
key employees, customers or suppliers; loss of revenues; increases in operating
or other costs; or other difficulties. In addition, we may not be able to
realize the operating efficiencies and other benefits sought from the merger.

Significant charges and expenses will be incurred as a result of the merger

  We expect to incur approximately $71.5 million of costs related to the
merger. These costs, which will be included as part of the cost of the oil and
gas properties acquired, will include investment banking expenses, severance,
legal and accounting fees, financial printing expenses and other related
charges. In addition, we expect to incur an estimated $20 to $30 million in
costs to combine the two companies. We may incur additional unanticipated
expenses in connection with the merger.

  We also may incur a noncash after-tax charge to earnings related to a full
cost ceiling limitation. Under the full cost method of accounting followed by
Devon, the net book value of oil and gas properties, less related deferred
income taxes, may not exceed a calculated "ceiling." The ceiling is the
estimated after-tax future net revenues from proved oil and gas properties,
discounted at 10% per year. The ceiling limitation is applied

                                       15
<PAGE>

separately by country. In calculating future net revenues, prices and costs in
effect at the time of the calculation are held constant indefinitely, except
for changes that are fixed and determinable by existing contracts. The net book
value, less deferred tax liabilities, is compared to the ceiling on a quarterly
basis. Any excess of the net book value, less deferred taxes, is written off as
an expense. An expense recorded in one period may not be reversed in a
subsequent period even though higher oil and gas prices may have increased the
ceiling applicable to the subsequent period.

  On a pro forma basis as of June 30, 1999, the merger would not have caused a
charge to earnings due to the ceiling limitation. This pro forma calculation
was based on a posted West Texas Intermediate oil price of $16.50 per barrel
and a Texas Gulf Coast index gas price of $2.14 per Mcf. However, the pro forma
ceiling "cushion" as of June 30, 1999, in our non-Canadian cost centers was
less than $20 million. Therefore, future reductions in oil and gas prices or
changes to the preliminary allocation of the purchase price of PennzEnergy's
oil and gas properties could cause a charge to earnings as of September 30,
1999, or in subsequent periods.

Devon may incur a tax liability for a prior PennzEnergy transaction as a result
of the merger

  If PennzEnergy's distribution to its stockholders of the stock of Pennzoil-
Quaker State Company in December 1998 were to be considered part of a plan or
series of related transactions that includes the merger, Devon would recognize
gain under Section 355(e) of the Internal Revenue Code. We believe the
distribution and the merger should not be considered part of such a plan or
series of related transactions because, among other things, neither Devon nor
PennzEnergy contemplated a business combination with the other and until April
1999 the parties had no discussions regarding a business combination. However,
any transaction within a four-year period beginning two years before the
distribution is presumed to be part of such a plan. We cannot assure you that
we will be able to overcome this presumption. We currently estimate our
potential tax liability upon such a transaction at $16 million in additional
tax for 1998 and the elimination of approximately $183 million in net operating
loss carryovers through 1998.

Devon stockholders are exposed to risks of offshore operations

  As a result of the merger some of our production and reserves are now located
offshore in the Gulf of Mexico. Operations in this area are subject to tropical
weather disturbances. Some of these disturbances can be severe enough to cause
substantial damage to facilities and possibly interrupt production. In
accordance with customary industry practices, Devon will maintain insurance
against some, but not all, of these risks. Losses could occur for uninsurable
or uninsured risks or in amounts in excess of existing insurance coverage. We
cannot assure you that Devon will be able to maintain adequate insurance in the
future at rates it considers reasonable or that any particular types of
coverage will be available. An event that is not fully covered by insurance
could have a material adverse effect on Devon's financial position and results
of operations.

                                       16
<PAGE>

We are subject to uncertainties of foreign operations

  As a result of the merger, we now have international operations in Australia,
Azerbaijan, Brazil, Canada, Egypt, Qatar and Venezuela. Local political,
economic and other uncertainties may adversely affect these operations. These
uncertainties include:

  . the risk of war, general strikes, civil unrest, expropriation, forced
    renegotiation or modification of existing contracts, and import, export
    and transportation regulations and tariffs;

  . taxation policies, including royalty and tax increases and retroactive
    tax claims;

  . exchange controls, currency fluctuations, devaluation or other activities
    that limit or disrupt markets and restrict payments or the movement of
    funds, and other uncertainties arising out of foreign government
    sovereignty over international operations;

  . laws and policies of the United States affecting foreign trade, taxation
    and investment;

  . the possibility of being subject to the exclusive jurisdiction of foreign
    courts in connection with legal disputes and the possible inability to
    subject foreign persons to the jurisdiction of courts in the United
    States; and

  . difficulties in enforcing our rights against a governmental agency
    because of the doctrine of sovereign immunity.

The merger has increased our debt level, which may result in a lower debt
rating and require a substantial portion of operating cash flow to pay interest
and principal

  The merger has resulted in higher levels of debt and interest expense than we
had on a stand-alone basis prior to the merger. Our total indebtedness after
the merger may have a negative impact on our ability to realize the expected
benefits of the merger, including a possible downgrade in our credit rating.
Standard & Poor's has announced that, because of our higher leverage, it may
assign a debt rating that is lower than our current senior debt rating of
"BBB+." The increased debt level will also require us to use a substantial
portion of our operating cash flow to pay interest and principal on our debt
instead of for other corporate purposes.

                                       17
<PAGE>

                                USE OF PROCEEDS

  We estimate that the net proceeds to us after deducting the underwriting
discount and other estimated offering expenses payable by us from the sale of
the 9.9 million shares of common stock in this offering will be approximately
$385.2 million ($443.1 million if the underwriters' over-allotment is exercised
in full), at a public offering price of $40.50 per share. We intend to use the
net proceeds from this offering to retire $350 million of long-term debt that
bears interest at approximately 10% per year, and to retire $35.2 million of
debt outstanding under our U.S. credit facility that bears interest at floating
rates. The additional credit available as a result of the reduction in debt
will be used primarily for capital expenditures and acquisitions as they occur.

  Pending these uses, the net proceeds will be used to reduce outstanding debt
under our revolving credit facilities or invested in short-term investment-
grade instruments, certificates of deposit or direct or guaranteed obligations
of the U.S. government.

                                       18
<PAGE>

                                 CAPITALIZATION

  The following table compares our actual capitalization as of June 30, 1999,
to our capitalization after we sell the 9.9 million shares we are offering. The
table includes our pro forma capitalization after the PennzEnergy merger, both
with and without the offering. In preparing the following table, we have
assumed that we will receive net proceeds of $385.2 million from the sale of
9.9 million Devon common shares at $40.50 per share, less $15.8 million for the
underwriting discount and other estimated offering costs and expenses. We have
assumed that the $385.2 million of net proceeds would be used to retire $350
million of existing notes payable that bear interest at approximately 10% per
year, and to retire $35.2 million of debt outstanding under our U.S. credit
facility that bears interest at floating rates. The additional credit available
as a result of the reduction in debt will be used primarily for capital
expenditures and acquisitions as they occur.

  The capitalization as adjusted for the offering assumes that the
underwriter's over-allotment option is not exercised. You should read the
following table in conjunction with the historical consolidated financial
statements of Devon which are filed with the SEC and incorporated by reference
in this document and the unaudited pro forma financial information included in
this document.
<TABLE>
<CAPTION>
                                                   As of June 30, 1999
                                             ----------------------------------
                                                         Devon Pro Forma With
                                                            the PennzEnergy
                                                                Merger
                                                         ----------------------
                                                          Without
                                               Devon        the       With the
                                             Historical   Offering    Offering
                                             ----------  ----------  ----------
                                                      (In Thousands)
<S>                                          <C>         <C>         <C>
Long-term debt:
  Borrowings under credit facilities with
   banks...................................  $  223,013  $  319,077  $  283,913
  Notes:
    6.76% due July 19, 2005................      75,000      75,000      75,000
    6.79% due March 2, 2009................     150,000     150,000     150,000
  Debentures:
    9.625% due November 15, 1999, principal
     amount of $200 million................          --     200,000          --
    10.625% due June 1, 2001, principal
     amount of $150 million................          --     150,000          --
    10.25% due November 1, 2005, principal
     amount of $250 million................          --     275,825     275,825
    10.125% due November 15, 2009,
     principal amount of $200 million......          --     220,340     220,340
  Debentures exchangeable into shares of
   Chevron Corporation common stock (see
   note 4 on page 27)
    4.90% due August 15, 2008, principal
     amount of $443.8 million..............          --     452,683     452,683
    4.95% due August 15, 2008, principal
     amount of $316.5 million..............          --     322,836     322,836
                                             ----------  ----------  ----------
    Total long-term debt...................     448,013   2,165,761   1,780,597
                                             ----------  ----------  ----------
Devon-obligated mandatorily redeemable
 trust convertible preferred securities....     149,500     149,500     149,500
Stockholders' equity:
  Preferred stock, $1.00 par value.........          --       1,500       1,500
  Common stock, $0.10 par value............       4,882       7,030       8,020
  Additional paid-in capital...............     807,270   1,679,921   2,064,095
  Accumulated deficit......................    (225,582)   (225,582)   (225,582)
  Accumulated other comprehensive loss.....     (31,330)    (31,330)    (31,330)
                                             ----------  ----------  ----------
    Total stockholders' equity.............     555,240   1,431,539   1,816,703
                                             ----------  ----------  ----------
      Total capitalization.................  $1,305,163  $3,746,800  $3,746,800
                                             ==========  ==========  ==========
Shares authorized:
  Preferred stock..........................       3,000       4,500       4,500
  Common stock.............................     400,000     400,000     400,000
Shares outstanding:
  Preferred stock..........................          --       1,500       1,500
  Common stock.............................      48,820      70,296      80,196
Common shares reserved for issuance of
 options under Devon's stock option plans..       1,800       4,800       4,800
Employee stock options outstanding.........       2,974       5,059       5,059
</TABLE>

  The above pro forma capitalization with the PennzEnergy merger includes six
debentures issued by PennzEnergy which were assumed by Devon. Of these six
debentures, four will be outstanding after the proceeds from this offering are
used to retire two debentures totaling $350 million. The aggregate pro forma
amount recorded for the four remaining debentures is $61.4 million higher than
their aggregate principal amount. The excess amount is the amount by which the
debentures' estimated fair value at June 30, 1999 exceeded the principal
amounts. Because the PennzEnergy merger was accounted for using the purchase
method of accounting for business combinations, Devon recorded these debentures
at their fair values at the date the merger was closed. The difference will be
amortized over the debentures' lives as adjustments to interest expense.

                                       19
<PAGE>

                               MARKET PRICE DATA

  Devon common stock is listed on the AMEX under the symbol "DVN." We began
paying regular quarterly cash dividends on our common stock on June 30, 1993,
in the amount of $0.03 per share. Effective December 31, 1996, we increased our
quarterly dividend payment to $0.05 per share. We anticipate that we will
continue to pay regular quarterly dividends in the foreseeable future.
Dividends are also paid on our exchangeable shares at the same rate and on the
same dates as dividends paid on our common stock.

  The following table sets forth the quarterly high and low sales prices for
the Devon common stock as reported by the AMEX for the fiscal periods
indicated.

<TABLE>
<CAPTION>
                                            High      Low           Volume
                                            ----      ----      --------------
                                                                (In Thousands)
      <S>                                   <C>       <C>       <C>
      1996:
        Quarter Ended March 31, 1996....... $25 3/4   $19 7/8        2,825
        Quarter Ended June 30, 1996........  26 1/8    22            2,474
        Quarter Ended September 30, 1996...  27 1/2    22 3/4        4,715
        Quarter Ended December 31, 1996....  35 1/2    25 1/4        6,011
      1997:
        Quarter Ended March 31, 1997....... $38 7/8   $29 1/2        4,458
        Quarter Ended June 30, 1997........  38 1/2    27 3/8        5,619
        Quarter Ended September 30, 1997...  45 1/4    36 1/8        3,851
        Quarter Ended December 31, 1997....  49 1/8    35            4,460
      1998:
        Quarter Ended March 31, 1998....... $41 1/8   $32 7/8        5,542
        Quarter Ended June 30, 1998........  40 1/2    32 5/8        6,144
        Quarter Ended September 30, 1998...  36 5/8    26 1/8       10,170
        Quarter Ended December 31, 1998....  36        27 3/4        9,017
      1999:
        Quarter Ended March 31, 1999....... $31 3/4   $20 1/8       14,271
        Quarter Ended June 30, 1999........  37 7/16   25 15/16     14,221
        Quarter Ended September 30, 1999
         (through September 21, 1999)......  44 15/16  33           27,394
</TABLE>

  On September 21, 1999, the last full trading day prior to the date of this
prospectus, the last reported sales price on the American Stock Exchange of
shares of Devon common stock was $40 1/2.

                                       20
<PAGE>

                   UNAUDITED PRO FORMA FINANCIAL INFORMATION

  The following unaudited pro forma financial information has been prepared to
assist in the analysis of the financial effects of this offering of additional
Devon common stock and the PennzEnergy merger. This pro forma information is
based on the historical financial statements of Devon and PennzEnergy.

  The information was prepared based on the following:

  . The assumed net proceeds from this offering of 9.9 million common shares
    are $385.2 million. This is based on an offering price of $40.50 per
    share, less $15.8 million for the underwriting discount and other
    estimated offering costs and expenses.

  . Devon utilizes the full cost method of accounting for its oil and gas
    activities.

  . The merger was accounted for as a purchase of PennzEnergy by Devon.

  . The unaudited pro forma balance sheet has been prepared as if the public
    offering and the merger occurred on June 30, 1999. The unaudited pro
    forma statements of operations have been prepared as if the public
    offering and the merger occurred on January 1, 1998.

  . Targeted annual general and administrative expense and lease operating
    expense savings from the merger of $50 to $60 million have not been
    reflected as an adjustment to the historical data. These cost savings are
    expected to result from the consolidation of the corporate headquarters
    of Devon and PennzEnergy and the elimination of duplicate staff and
    expenses.

  . As of June 30, 1999, the merger did not cause a pro forma reduction of
    the carrying value of oil and gas properties under the full cost
    accounting "ceiling test." The June 30, 1999, ceiling test was calculated
    based on a posted West Texas Intermediate oil price of $16.50 per barrel
    and a Texas Gulf Coast index gas price of $2.14 per Mcf. However, the pro
    forma ceiling "cushion" as of June 30, 1999, in Devon's non-Canadian cost
    centers was less than $20 million. Therefore, future reductions in oil
    and gas prices or changes to the preliminary allocation of the purchase
    price of PennzEnergy's oil and gas properties could cause a reduction of
    the carrying value to be recorded as of September 30, 1999, or in
    subsequent periods.

  No pro forma adjustments have been made with respect to the following unusual
items. These items are reflected in the historical results of Devon or
PennzEnergy, as applicable, and should be considered when making period-to-
period comparisons:

  . In 1998, PennzEnergy realized pretax gains on the sale and exchange of
    Chevron Corporation common stock of $230.1 million. The unaudited pro
    forma statement of operations does not include the $207.0 million after-
    tax extraordinary loss resulting from the early extinguishment of related
    debentures exchangeable for such common stock.

  . In 1998, PennzEnergy incurred $24.3 million of nonrecurring general and
    administrative expenses in connection with the spin-off of Pennzoil-
    Quaker State Company on December 30, 1998.

  . In 1998, Devon incurred $13.1 million of nonrecurring expenses related to
    the merger with Northstar.

  . In 1998, Devon reduced the carrying value of its oil and gas properties
    by $126.9 million ($88.0 million after-tax) due to the full cost ceiling
    limitation.

  . In the second quarter of 1999, PennzEnergy recognized a gain of $46.7
    million ($29.8 million after-tax) from the sale of land, timber and
    mineral rights in Pennsylvania and New York.

  The unaudited pro forma financial statements and related notes are presented
for illustrative purposes only. If this offering of additional Devon common
stock and the PennzEnergy merger had occurred in the past, Devon's financial
position or operating results might have been different from those presented in
the unaudited pro forma information. The unaudited pro forma information should
not be relied upon as an indication of the financial position or operating
results that Devon would have achieved if this offering and the merger had
occurred as of June 30, 1999 or January 1, 1998. You also should not rely on
the unaudited pro forma information as an indication of the future results that
Devon will achieve after this offering and the merger.

                                       21
<PAGE>

                       Unaudited Pro Forma Balance Sheet

                                 June 30, 1999
                                 (In Thousands)

<TABLE>
<CAPTION>
                                                                 Devon Pro Forma With
                                                                    the PennzEnergy
                                                                        Merger
                                     PennzEnergy                 ----------------------
                                      Historical   Pro Forma      Without     With the
                           Devon     Reclassified Adjustments       the       Offering
                         Historical    (Note 6)    (Note 2)       Offering    (Note 3)
                         ----------  ------------ -----------    ----------  ----------
<S>                      <C>         <C>          <C>            <C>         <C>
Assets:
  Current assets........ $  104,760   $  128,912   $(10,300)(a)  $  233,672  $  233,672
                                                     10,300 (c)
  Oil and gas
   properties, net......  1,162,164    1,616,916    385,545 (a)   3,718,114   3,718,114
                                                    553,489 (c)
  Other properties,
   net..................     23,465           --      5,000 (a)      28,465      28,465
  Investment in common
   stock of Chevron
   Corporation (Note
   4)...................         --      674,224         --         674,224     674,224
  Other assets..........     14,774       34,054     30,179 (a)      79,007      79,007
                         ----------   ----------   --------      ----------  ----------
    Total assets........ $1,305,163   $2,454,106   $974,213      $4,733,482  $4,733,482
                         ==========   ==========   ========      ==========  ==========
Liabilities:
  Current liabilities... $   73,677   $  145,167   $ (5,374)(a)  $  213,470  $  213,470
  Debentures
   exchangeable into
   shares of Chevron
   Corporation common
   stock (Note 4).......         --      740,361     35,158 (a)     775,519     775,519
  Other long-term debt..    448,013      822,652     48,032 (a)   1,390,242   1,005,078
                                                     71,545 (a)
  Other long-term
   liabilities..........     34,584      133,280     (2,590)(a)     165,274     165,274
  Deferred income
   taxes................     44,149      187,257   (187,257)(a)     607,938     607,938
                                                    563,789 (c)
  Company-obligated
   mandatorily
   redeemable
   convertible preferred
   securities of
   subsidiary trust
   holding solely 6.5%
   convertible junior
   subordinated
   debentures of Devon
   Energy Corporation...    149,500           --                    149,500     149,500
Stockholders' equity:
  Preferred stock.......         --        1,500                      1,500       1,500
  Common stock..........      4,882       43,507      2,148 (a)       7,030       8,020
                                                    (43,507)(b)
  Additional paid-in
   capital..............    807,270      354,504    710,151 (a)   1,679,921   2,064,095
                                                     14,000 (a)
                                                    148,500 (a)
                                                   (354,504)(b)
  Accumulated deficit...   (225,582)     (23,743)    23,743 (b)    (225,582)   (225,582)
  Accumulated other
   comprehensive
   earnings (loss)......    (31,330)     275,743   (275,743)(b)     (31,330)    (31,330)
  Treasury stock........         --     (226,122)   226,122 (b)          --          --
                         ----------   ----------   --------      ----------  ----------
    Total stockholders'
     equity.............    555,240      425,389    450,910       1,431,539   1,816,703
                         ----------   ----------   --------      ----------  ----------
    Total liabilities
     and stockholders'
     equity............. $1,305,163   $2,454,106   $974,213      $4,733,482  $4,733,482
                         ==========   ==========   ========      ==========  ==========
</TABLE>



                                       22
<PAGE>

                  Unaudited Pro Forma Statement of Operations

                          Year Ended December 31, 1998

                     (In Thousands, Except Per Share Data)

<TABLE>
<CAPTION>
                                                                Devon Pro Forma With
                                                                   the PennzEnergy
                                                                       Merger
                                    PennzEnergy                 ----------------------
                                     Historical   Pro Forma      Without     With the
                           Devon    Reclassified Adjustments       the       Offering
                         Historical   (Note 6)    (Note 2)       Offering    (Note 3)
                         ---------- ------------ -----------    ----------  ----------
<S>                      <C>        <C>          <C>            <C>         <C>
Revenues:
  Oil sales.............  $143,624    $159,294                  $  302,918  $  302,918
  Gas sales.............   209,344     344,594                     553,938     553,938
  NGL sales.............    16,692      47,011                      63,703      63,703
  Other.................    17,848     286,468      (8,513)(g)     295,803     295,803
                          --------    --------    --------      ----------  ----------
    Total revenues......   387,508     837,367      (8,513)      1,216,362   1,216,362
                          --------    --------    --------      ----------  ----------
Costs and expenses:
  Lease operating
   expenses.............   113,484     181,255                     294,739     294,739
  Production taxes......    13,916      14,232                      28,148      28,148
  Depreciation,
   depletion and
   amortization.........   123,844     208,009     178,211 (d)     510,064     510,064
  General and
   administrative
   expenses.............    23,554     126,124     (10,300)(g)     139,378     139,378
  Northstar combination
   expenses.............    13,149          --                      13,149      13,149
  Interest expense......    22,632     156,272       4,114 (e)     176,659     139,449
                                                    (6,359)(f)
  Exploration expenses..        --     139,970    (139,970)(g)          --          --
  Deferred effect of
   changes in foreign
   currency exchange
   rate on subsidiary's
   long-term debt.......    16,104          --                      16,104      16,104
  Distributions on
   preferred securities
   of subsidiary
   trust................     9,717          --                       9,717       9,717
  Reduction of carrying
   value of oil and gas
   properties...........   126,900      74,739     (74,739)(g)     126,900     126,900
                          --------    --------    --------      ----------  ----------
    Total costs and
     expenses...........   463,300     900,601     (49,043)      1,314,858   1,277,648
                          --------    --------    --------      ----------  ----------
Earnings (loss) before
 income tax expense
 (benefit)..............   (75,792)    (63,234)     40,530         (98,496)    (61,286)
Income tax expense
 (benefit):
  Current...............     7,687       2,637          --          10,324      10,324
  Deferred..............   (23,194)    (20,405)     15,401 (h)     (28,198)    (14,058)
                          --------    --------    --------      ----------  ----------
    Total income tax
     expense
     (benefit)..........   (15,507)    (17,768)     15,401        ( 17,874)     (3,734)
                          --------    --------    --------      ----------  ----------
Net earnings (loss).....   (60,285)    (45,466)     26,029         (80,622)    (57,552)
Preferred stock
 dividends..............        --       5,625          --           5,625       5,625
                          --------    --------    --------      ----------  ----------
Net earnings (loss)
 applicable to common
 shareholders...........  $(60,285)   $(51,091)   $ 26,029      $  (86,247) $  (63,177)
                          ========    ========    ========      ==========  ==========
Net loss per average
 common share
 outstanding--basic and
 diluted................  $  (1.25)   $  (1.07)                 $    (1.24) $    (0.79)
                          ========    ========                  ==========  ==========
Weighted average common
 shares outstanding--
 basic (Note 5).........    48,376      47,716                      69,729      79,629
                          ========    ========                  ==========  ==========
</TABLE>

                                       23
<PAGE>

                  Unaudited Pro Forma Statement of Operations

                         Six Months Ended June 30, 1999

                     (In Thousands, Except Per Share Data)

<TABLE>
<CAPTION>
                                                                 Devon Pro Forma
                                                                    With the
                                                                   PennzEnergy
                                                                     Merger
                                    PennzEnergy                 ------------------
                                     Historical   Pro Forma     Without   With the
                           Devon    Reclassified Adjustments      the     Offering
                         Historical   (Note 6)    (Note 2)      Offering  (Note 3)
                         ---------- ------------ -----------    --------  --------
<S>                      <C>        <C>          <C>            <C>       <C>
Revenues:
  Oil sales.............  $64,784     $ 85,114                  $149,898  $149,898
  Gas sales.............  112,938      150,884                   263,822   263,822
  NGL sales.............    9,764       18,732                    28,496    28,496
  Other.................    4,092       67,119      (5,557)(g)    65,654    65,654
                          -------     --------    --------      --------  --------
    Total revenues......  191,578      321,849      (5,557)      507,870   507,870
                          -------     --------    --------      --------  --------
Costs and expenses:
  Lease operating
   expenses.............   54,520       76,476                   130,996   130,996
  Production taxes......    6,415        6,764                    13,179    13,179
  Depreciation,
   depletion and
   amortization.........   69,321      131,450      46,597 (d)   247,368   247,368
  General and
   administrative
   expenses.............   13,175       49,870      (5,150)(g)    57,895    57,895
  Interest expense......   13,779       61,811       2,057 (e)    74,232    55,627
                                                    (3,415)(f)
  Exploration expenses..       --       17,537     (17,537)(g)        --        --
  Deferred effect of
   changes in foreign
   currency exchange
   rate on subsidiary's
   long-term debt.......   (8,746)          --                    (8,746)   (8,746)
  Distributions on
   preferred securities
   of subsidiary trust..    4,859           --                     4,859     4,859
                          -------     --------    --------      --------  --------
    Total costs and
     expenses...........  153,323      343,908      22,552       519,783   501,178
                          -------     --------    --------      --------  --------
Earnings (loss) before
 income tax expense
 (benefit)..............   38,255      (22,059)    (28,109)      (11,913)    6,692
Income tax expense
 (benefit):
  Current...............    4,302          (34)         --         4,268     4,268
  Deferred..............   11,764       (9,140)    (10,681)(k)    (8,057)     (988)
                          -------     --------    --------      --------  --------
    Total income tax
     expense
     (benefit)..........   16,066       (9,174)     10,681        (3,789)    3,280
                          -------     --------    --------      --------  --------
Net earnings (loss).....   22,189      (12,885)    (17,428)       (8,124)    3,412
Preferred stock
 dividends..............       --        4,868          --         4,868     4,868
                          -------     --------    --------      --------  --------
Net earnings (loss)
 applicable to common
 shareholders...........  $22,189     $(17,753)   $(17,428)     $(12,992) $ (1,456)
                          =======     ========    ========      ========  ========
Net earnings (loss) per
 average common share
 outstanding--basic and
 diluted................  $  0.46     $  (0.37)                 $  (0.19) $  (0.02)
                          =======     ========                  ========  ========
Weighted average common
 shares outstanding--
 basic (Note 5).........   48,575       47,923                    70,021    79,921
                          =======     ========                  ========  ========
</TABLE>


                                       24
<PAGE>

               NOTES TO UNAUDITED PRO FORMA FINANCIAL INFORMATION

                      December 31, 1998 and June 30, 1999

1. Method of Accounting for the Merger

  Devon accounted for the merger using the purchase method of accounting for
business combinations. Accordingly, PennzEnergy's assets acquired and
liabilities assumed by Devon were revalued and recorded at their estimated
"fair values." In the merger, Devon issued 0.4475 shares of Devon common stock
for each outstanding share of PennzEnergy common stock. This resulted in Devon
issuing approximately 21.4 million shares of its common stock to PennzEnergy
stockholders.

  The purchase price of PennzEnergy's net assets acquired was based on the
value of the Devon common stock issued to the PennzEnergy stockholders. The
value of the Devon common stock issued was based on the average trading price
of Devon's common stock for a period of three days before and after the public
announcement of the merger. This average trading price equaled $33.40 per
share.

2. Pro Forma Adjustments Related to the Merger

  The unaudited pro forma balance sheet includes the following adjustments:

    (a) This entry adjusts the historical book values of PennzEnergy's assets
  and liabilities to their estimated fair values as of June 30, 1999. The
  calculation of the total purchase price and the preliminary allocation to
  assets and liabilities are shown below.

<TABLE>
<CAPTION>
                                                                 (In Thousands,
                                                                  Except Share
                                                                     Price)
                                                                 --------------
   <S>                                                           <C>
   Calculation and preliminary allocation of purchase price:
     Shares of Devon common stock issued to PennzEnergy
      stockholders.............................................        21,476
     Average Devon stock price.................................    $    33.40
                                                                   ----------
     Fair value of common stock issued.........................       717,298
     Plus preferred stock assumed by Devon.....................       150,000
     Plus estimated merger costs to be incurred................        71,545
     Plus fair value of PennzEnergy employee stock options
      assumed by Devon.........................................        14,000
     Less estimated stock registration and issuance costs to be
      incurred.................................................        (4,999)
                                                                   ----------
   Total purchase price........................................       947,844
   Plus fair value of liabilities assumed by Devon:
     Current liabilities.......................................       139,793
     Debentures exchangeable into Chevron Corporation common
      stock....................................................       775,519
     Other long-term debt......................................       870,684
     Other long-term liabilities...............................       130,690
                                                                   ----------
                                                                    2,864,530
                                                                   ----------
   Less fair value of non oil and gas assets acquired by Devon:
     Current assets............................................       118,612
     Non oil and gas properties................................         5,000
     Investment in common stock of Chevron Corporation.........       674,224
     Other assets..............................................        64,233
                                                                   ----------
                                                                      862,069
                                                                   ----------
   Fair value allocated to oil and gas properties, including
    $111 million of undeveloped leasehold......................    $2,002,461
                                                                   ==========
</TABLE>

  The total purchase price includes the value of the Devon common stock issued,
net of $5.0 million of estimated registration and issuance costs. The purchase
price also includes:

                                       25
<PAGE>

        NOTES TO UNAUDITED PRO FORMA FINANCIAL INFORMATION--(Continued)

                      December 31, 1998 and June 30, 1999


  . $150 million of Devon preferred stock issued in exchange for the same
    amount of PennzEnergy preferred stock. The unaudited pro forma balance
    sheet includes $1.5 million of PennzEnergy's historical aggregate par
    value of the preferred stock, plus $148.5 million of additional paid-in
    capital.

  . $71.5 million of estimated merger costs. These costs include advisory
    fees, severance and other merger-related costs. These costs are added to
    long-term debt in the unaudited pro forma balance sheet.

  . $14 million of Devon employee stock options issued in exchange for
    existing vested PennzEnergy employee stock options. The value of these
    options is added to additional paid-in capital in the unaudited pro forma
    balance sheet.

    (b) This adjustment includes a $43.5 million reduction to par value, a
  $354.5 million reduction of additional paid-in capital, a $23.7 million
  reduction of accumulated deficit, a $275.7 million reduction of accumulated
  other comprehensive earnings and a $226.1 million reduction of treasury
  stock. These adjustments eliminate PennzEnergy's historical book values of
  those accounts.

    (c) This adjustment increases the value of PennzEnergy's oil and gas
  properties acquired by $553.5 million, and increases current assets by
  $10.3 million, both for related deferred income taxes. This adjustment
  equals the deferred income tax effect of the difference between the fair
  values assigned to PennzEnergy's assets and liabilities and their bases for
  income tax purposes. Due to the tax-free nature of the merger, Devon's tax
  basis in those assets and liabilities is the same as PennzEnergy's tax
  basis.

  The unaudited pro forma statements of operations include the following
adjustments:

    (d) This adjustment reflects the pro forma depreciation, depletion and
  amortization expense using the full cost method of accounting based on the
  preliminary allocation of the purchase price.

    (e) This adjustment increases interest expense due to the $71.5 million
  of merger costs assumed to be funded with borrowings from credit
  facilities.

    (f) This adjustment reduces interest expense for the year 1998 and the
  first quarter of 1999 by $6.4 million and $1.7 million, respectively. These
  amounts represent the amortization of the pro forma premium recorded in
  long-term debt as of January 1, 1998 as part of pro forma adjustment (a) to
  record PennzEnergy's assets and liabilities at their estimated fair values.

    (g) This adjustment eliminates historical amounts recorded by PennzEnergy
  under the successful efforts accounting method for gains on property sales,
  general and administrative expenses, exploration expenses and asset
  impairments to conform to the full cost method of accounting followed by
  Devon. Under the full cost method, proceeds from the sale of oil and gas
  properties are generally recorded as an adjustment of the carrying value of
  the properties, with no gain or loss recognized. Also, general and
  administrative expenses incurred for property acquisition, exploration and
  development activities are capitalized under the full cost method. In
  addition, exploration expenses, which include items such as dry hole costs
  and lease expirations or impairment expenses, are capitalized under the
  full cost method. The $74.7 million reduction of oil and gas properties
  recorded by PennzEnergy in the year 1998 was calculated under the
  successful efforts method and therefore has been eliminated in the pro
  forma statement of operations for 1998.

    (h) This adjustment records the net tax effect of all pro forma
  adjustments at an effective income tax rate of 38%.

                                       26
<PAGE>

        NOTES TO UNAUDITED PRO FORMA FINANCIAL INFORMATION--(Continued)

                      December 31, 1998 and June 30, 1999


3. Pro Forma Effects of this Offering of Additional Shares of Devon Common
Stock

  The accompanying pro forma financial statements include a column titled
"Devon Pro Forma With the PennzEnergy Merger--With the Offering." The amounts
included in this column on the pro forma balance sheet include the effects of
issuing 9.9 million additional shares of Devon common stock and applying the
estimated net proceeds of $385.2 million against long-term debt. The pro forma
balance sheet assumes that the offering occurred on June 30, 1999.

  The amounts included in this column on the pro forma statements of operations
include the effects of lower interest expense and the related change in income
tax expense due to the assumed reduction of long-term debt with the proceeds
from this offering. The pro forma statements of operations assume that the
offering occurred on January 1, 1998.

4. Investment in Chevron Common Stock and Related Exchangeable Debentures

  As of June 30, 1999 and December 31, 1998, PennzEnergy beneficially owned
approximately 7.1 million shares of Chevron Corporation common stock. These
shares have been deposited with an exchange agent for possible exchange for
$761.2 million principal amount of exchangeable debentures of PennzEnergy. Each
$1,000 principal amount of the exchangeable debentures is exchangeable into
9.3283 shares of Chevron common stock, an exchange rate equivalent to $107 7/32
per share of Chevron common stock.

  The exchangeable debentures consist of $443.8 million of 4.90% debentures and
$316.5 million of 4.95% debentures. The exchangeable debentures were issued on
August 3, 1998 and mature August 15, 2008. The exchangeable debentures are
callable beginning on August 15, 2000. The exchangeable debentures are
exchangeable at the option of the holders at any time prior to maturity for
shares of Chevron common stock. In lieu of delivering Chevron common stock,
PennzEnergy may, at its option, pay to any holder an amount in cash equal to
the market value of the Chevron common stock to satisfy the exchange request.

5. Common Shares Outstanding

  Net earnings (loss) per average share outstanding have been calculated based
upon the pro forma weighted average number of shares outstanding as follows:

<TABLE>
<CAPTION>
                                                                   Six  Months
                                                       Year Ended     Ended
                                                      December 31,  June 30,
                                                          1998        1999
                                                      ------------ -----------
                                                           (In Thousands)
     <S>                                              <C>          <C>
     Devon's weighted average common shares
      outstanding....................................    48,376      48,575
     Devon shares issued in exchange for all
      outstanding shares of PennzEnergy .............    21,353      21,446
                                                         ------      ------
     Pro forma weighted average Devon shares
      outstanding with the PennzEnergy merger........    69,729      70,021
     Additional Devon common shares to be issued in
      this offering..................................     9,900       9,900
                                                         ------      ------
     Pro forma weighted average Devon common shares
      with the PennzEnergy merger and the shares to
      be issued in this offering.....................    79,629      79,921
                                                         ======      ======
</TABLE>

                                       27
<PAGE>

        NOTES TO UNAUDITED PRO FORMA FINANCIAL INFORMATION--(Continued)

                      December 31, 1998 and June 30, 1999


  Pro forma common shares outstanding at June 30, 1999, are as follows:

<TABLE>
<CAPTION>
                                                                (In Thousands)
                                                                --------------
      <S>                                                       <C>
      Devon's common shares outstanding........................     48,820
      Devon shares issued in exchange for all outstanding
       shares of PennzEnergy ..................................     21,476
                                                                    ------
      Pro forma Devon common shares outstanding with the
       PennzEnergy merger......................................     70,296
      Additional Devon common shares to be issued in this
       offering................................................      9,900
                                                                    ------
      Pro forma Devon common shares outstanding with the
       PennzEnergy merger and the shares to be issued in this
       offering................................................     80,196
                                                                    ======
</TABLE>

6. PennzEnergy Historical and Reclassified Balances

  Devon and PennzEnergy record certain revenues and expenses differently in
their respective consolidated financial statements. To make the unaudited pro
forma financial information consistent, we have reclassified certain of
PennzEnergy's balances to conform to Devon's financial presentation. The
following tables present PennzEnergy's balances as presented in its historical
financial statements and the reclassified balances which are included in the
accompanying unaudited pro forma statements of operations.

  Securities and Exchange Commission rules regarding pro forma presentation
require that the pro forma statements of operations disclose income or loss
from continuing operations. As shown in the tables below, PennzEnergy's
historical results for the year 1998 included a loss from discontinued
operations and extraordinary items that are not included in the reclassified
balances presented in the accompanying unaudited pro forma statement of
operations for 1998.

                                       28
<PAGE>

        NOTES TO UNAUDITED PRO FORMA FINANCIAL INFORMATION--(Continued)

                      December 31, 1998 and June 30, 1999


  In addition to the reclassifications shown below for the unaudited pro forma
statements of operations, a reclassification has been made to PennzEnergy's
historical balance sheet for the accompanying unaudited pro forma balance sheet
as of June 30, 1999. PennzEnergy had $38.4 million classified as minority
interest in its June 30, 1999 historical consolidated balance sheet. To conform
to Devon's presentation, this amount is included as other long-term liabilities
in the accompanying unaudited pro forma balance sheet.

<TABLE>
<CAPTION>
                                Year Ended December 31, 1998              Six Months Ended June 30, 1999
                         ------------------------------------------ ------------------------------------------
                                                       PennzEnergy                                PennzEnergy
                         PennzEnergy                    Historical  PennzEnergy                    Historical
                         Historical  Reclassifications Reclassified Historical  Reclassifications Reclassified
                         ----------- ----------------- ------------ ----------- ----------------- ------------
                                                              (Unaudited)
                                                            (In Thousands)
<S>                      <C>         <C>               <C>          <C>         <C>               <C>
Revenues:
 Net sales..............  $ 550,899      $(550,899)      $     --    $254,730       $(254,730)      $     --
 Oil sales..............         --        159,294        159,294          --          85,114         85,114
 Gas sales..............         --        344,594        344,594          --         150,884        150,884
 NGL sales..............         --         47,011         47,011          --          18,732         18,732
 Investment and other
  income................    286,468             --        286,468      67,119              --         67,119
                          ---------      ---------       --------    --------       ---------       --------
   Total revenues.......    837,367             --        837,367     321,849              --        321,849
                          ---------      ---------       --------    --------       ---------       --------
Costs and expenses:
 Lease operating
  expenses..............    217,194        (35,939)       181,255      90,782         (14,306)        76,476
 Production taxes.......         --         14,232         14,232          --           6,764          6,764
 General and
  administrative
  expenses..............     52,228         73,896        126,124      19,676          30,194         49,870
 Depreciation,
  depletion and
  amortization..........    208,009             --        208,009     131,450              --        131,450
 Impairment of long-
  lived assets..........     74,739             --         74,739          --              --             --
 Exploration expenses...    161,615        (21,645)       139,970      25,921          (8,384)        17,537
 Taxes, other than
  income................     30,544        (30,544)            --      14,268         (14,268)            --
 Interest charges,
  net...................    156,272             --        156,272      61,811              --         61,811
                          ---------      ---------       --------    --------       ---------       --------
   Total costs and
    expenses............    900,601             --        900,601     343,908              --        343,908
                          ---------      ---------       --------    --------       ---------       --------
Loss from continuing
 operations before
 income tax.............    (63,234)            --        (63,234)    (22,059)             --        (22,059)
Income tax benefit......    (17,768)            --        (17,768)     (9,174)             --         (9,174)
                          ---------      ---------       --------    --------       ---------       --------
Loss from continuing
 operations.............  $ (45,466)     $      --       $(45,466)   $(12,885)      $      --       $(12,885)
                                         =========       ========                   =========       ========
Loss from discontinued
 operations.............     (3,246)                                       --
                          ---------                                  --------
Loss before
 extraordinary items....    (48,712)                                  (12,885)
Extraordinary items.....   (206,963)                                       --
                          ---------                                  --------
Net loss................   (255,675)                                  (12,885)
Preferred stock
 dividends..............      5,625                                     4,868
                          ---------                                  --------
Net loss available to
 common shareholders....  $(261,300)                                 $(17,753)
                          =========                                  ========
</TABLE>


                                       29
<PAGE>

                              PROPERTIES OF DEVON

  The following table shows the total proved reserves of Devon on a pro forma
basis as of December 31, 1998:

<TABLE>
<CAPTION>
                                    Proved Reserves as of December 31, 1998
                         -------------------------------------------------------------
                                                                                 10%
                           Devon    PennzEnergy Devon Pro        10% Present   Present
Primary Operating Areas  Historical Historical    Forma   MBoe%     Value      Value %
- -----------------------  ---------- ----------- --------- ----- -------------- -------
                                                                (In Thousands)
<S>                      <C>        <C>         <C>       <C>   <C>            <C>
North America--MBoe
 Western Canadian
  Sedimentary Basin.....   143,908         --     143,908   22%   $  462,921      22%
 Permian Basin..........    53,375     61,351     114,726   17%      292,951      14%
 Rocky Mountain
  Region................    78,973     23,677     102,650   16%      355,902      17%
 Gulf Coast/East Texas
  Region................     1,800     86,927      88,727   13%      390,560      19%
 Offshore Gulf of
  Mexico................        --     78,674      78,674   12%      339,995      16%
 Other U.S..............    21,295     16,477      37,772    6%      107,583       5%
                         ---------    -------   ---------  ---    ----------     ---
Total--North America....   299,351    267,106     566,457   86%    1,949,912      93%
                         ---------    -------   ---------  ---    ----------     ---

International--MBoe
 Azerbaijan.............        --     76,082      76,082   11%      135,867       7%
 Other International....        --     17,557      17,557    3%        1,887       0%
                         ---------    -------   ---------  ---    ----------     ---
Total International.....        --     93,639      93,639   14%      137,754       7%
                         ---------    -------   ---------  ---    ----------     ---
Total North America and
 International..........   299,351    360,745     660,096  100%   $2,087,666     100%
                         =========    =======   =========  ===    ==========     ===
Oil--MBbls
 U.S....................    44,451     95,969     140,420   21%
 Western Canadian
  Sedimentary Basin.....    39,006         --      39,006    6%
 Azerbaijan.............        --     76,082      76,082   11%
 Other International....        --     17,180      17,180    3%
                         ---------    -------   ---------  ---
   Total................    83,457    189,231     272,688   41%
                         =========    =======   =========  ===
Gas--MMcf
 U.S....................   596,987    849,368   1,446,355   37%
 Western Canadian
  Sedimentary Basin.....   601,907         --     601,907   15%
 Other International....        --      2,266       2,266    0%
                         ---------    -------   ---------  ---
   Total................ 1,198,894    851,634   2,050,528   52%
                         =========    =======   =========  ===
NGLs--MBbls
 U.S....................    11,494     29,575      41,069    6%
 Western Canadian
  Sedimentary Basin.....     4,585         --       4,585    1%
                         ---------    -------   ---------  ---
   Total................    16,079     29,575      45,654    7%
                         =========    =======   =========  ===
Total--MBoe.............   299,351    360,745     660,096  100%
                         =========    =======   =========  ===
</TABLE>

Primary Operating Areas--North America

  Our North American property base is concentrated in five primary operating
areas: the Western Canadian Sedimentary Basin, which encompasses portions of
British Columbia, Alberta, Saskatchewan and Manitoba; the Permian Basin of
southeastern New Mexico and west Texas; the Rocky Mountain Region, which spans
from northeast Wyoming to northwest New Mexico; the offshore Gulf of Mexico;
and the Gulf Coast/East Texas Region in portions of Texas and Louisiana.

Western Canadian Sedimentary Basin

  Our single largest reserve position is in the Western Canadian Sedimentary
Basin with proved reserves of 143.9 million barrels of oil equivalent, or 22%
of the total company on a pro forma basis as of December 31, 1998. This basin
is a large geologic feature encompassing portions of British Columbia, Alberta,
Saskatchewan and Manitoba. This basin feature forms a wedge-shaped depression
that tapers from a maximum thickness of 17,000 feet on the western and southern
margins to a zero edge along the northeast. Devon's properties in this

                                       30
<PAGE>

basin range from shallow oil and natural gas production in Northern Alberta to
deep, long-lived gas reservoirs in the Foothills area near the Alberta/British
Columbia border. In addition, approximately 2.2 million net acres of
undeveloped leasehold in the Western Canadian Sedimentary Basin should continue
to provide Devon with numerous exploration and development opportunities.

Permian Basin

  This region encompasses approximately 66,000 square miles in southeastern New
Mexico and west Texas and contains more than 500 major oil and gas fields.
Since 1987, we have made several significant acquisitions of properties in the
Permian Basin that have established prospective acreage in areas in which
leasehold positions could not otherwise be obtained. The Permian Basin
represents one of our largest reserve positions with total reserves of 114.7
million barrels of oil equivalent, or 17% of our total reserves on a pro forma
basis as of December 31, 1998. In addition, several hundred thousand acres of
undeveloped leasehold should continue to provide us with numerous exploration
and development opportunities in the Permian Basin.

Rocky Mountain Region

  The Rocky Mountain Region includes oil and gas producing basins that are
grouped together because of their geographic location rather than their
geological characteristics. The region generally encompasses all or portions of
the states of Colorado, Montana, New Mexico, North Dakota, Utah and Wyoming.
Our properties are primarily located in the San Juan Basin in northwest New
Mexico, the Raton Basin in northeast New Mexico and southeast Colorado, and the
Big Horn and Powder River basins in northeast Wyoming. The Rocky Mountain
Region represents one of our largest reserve areas with 102.7 million barrels
of oil equivalent, or 16% of the total company on a pro forma basis as of
December 31, 1998. We will also have over one million acres of net undeveloped
leasehold in the Rocky Mountain Region.

  Our single largest natural gas reserve position in the Rocky Mountain Region
relates to its interests in two federal units in the San Juan Basin. The San
Juan Basin is a densely drilled area covering 3,700 square miles. It has been
historically considered the second largest gas producing basin in the United
States. Prior to 1990, the basin's gas production primarily came from
conventional sandstone formations at a depth of about 5,500 feet. However, in
the early 1980's, development of the shallower Fruitland coal formation began.
Coal seam gas production has increased total production so significantly that
the San Juan Basin could be considered the largest gas producing basin in the
United States.

  Our coal seam expertise will also play an important role in both the Powder
River and Raton basins. These basins, which are less developed than the San
Juan Basin, have become two of the more active domestic onshore exploration
areas in the United States. During the next five years, we plan to drill
several thousand coalbed methane wells in the Powder River and Raton basins
which could, in the aggregate, add proved natural gas reserves in excess of two
trillion cubic feet. Peak production for the Powder River Basin is anticipated
for 2003, while peak production in the Raton Basin is estimated for 2004 to
2006. Additionally, we anticipate initial operation of a 126-mile gas gathering
system servicing the Powder River Basin in the fourth quarter of 1999. When it
is fully developed in 2001, this system will have an estimated capacity of 450
million cubic feet of gas per day and will have access to multiple interstate
pipelines.

Gulf Coast/East Texas Region

  Our interest in the Gulf Coast/East Texas Region consists of over 465,000 net
acres in portions of the states of Texas and Louisiana and includes both oil
and gas producing zones. On a pro forma basis as of December 31, 1998, our Gulf
Coast/East Texas reserves were 88.7 million barrels of oil equivalent, or 13%
of our total reserves. In south Texas, where exploration by the oil and gas
industry is accelerating, 3-D seismic data covers our major acreage positions
underlain by Charco Lobo, the Middle Wilcox and the Frio-Vicksburg formations.

                                       31
<PAGE>

Offshore Gulf of Mexico

  We are one of the ten largest producers on the shelf in the Offshore Gulf of
Mexico with operations on 75 blocks. On a pro forma basis as of December 31,
1998, proved reserves in the Gulf totaled 78.7 million barrels of oil
equivalent, or 12% of our total reserves. We operate more than 40 fields and 80
platforms on the central and western shelf. We also hold interests in another
98 exploratory blocks, 39 of which are deepwater. Of the 39 deepwater blocks,
two blocks are in production and two blocks are undergoing development. We
conduct both shallow and deepwater exploration and development drilling in the
Gulf of Mexico.

Primary Operating Areas--International

  Our property base outside North America includes approximately 94 million
barrels of oil equivalent reserves, or 14% of our total reserves on a pro forma
basis as of December 31, 1998. We also have 10.5 million net undeveloped acres
outside of North America. While our international operations are focused
primarily in Azerbaijan, we also have interests in Venezuela, Brazil, Egypt,
Qatar and Australia.

Azerbaijan

  Most of our proved reserves that lie outside North America are in Azerbaijan.
On a pro forma basis as of December 31, 1998, proved reserves in Azerbaijan
totaled 76.1 million barrels of oil equivalent, or 11% of our total reserves.
Our properties in Azerbaijan are located in the Caspian Basin, which is
considered home to some of the world's last known major undeveloped hydrocarbon
reserves. We hold a 4.8% carried interest in the Azeri-Chirag-Gunashli joint
development area, which is estimated to contain five billion barrels of crude
oil. Peak production for Azerbaijan is estimated sometime between 2005 and
2008.

Developed and Undeveloped Acreage

  The following table sets forth our developed and undeveloped oil and gas
lease and mineral acreage on a pro forma basis as of December 31, 1998. Gross
acres are the total number of acres in which we own a working interest. Net
refers to gross acres multiplied by our fractional working interests.

<TABLE>
<CAPTION>
                                                       Developed   Undeveloped
                                                      ----------- -------------
                                                      Gross  Net  Gross   Net
                                                      ----- ----- ------ ------
                                                       (In Thousands of Acres)
      <S>                                             <C>   <C>   <C>    <C>
      United States--Onshore......................... 2,815 1,583  3,049  1,789
      United States--Offshore........................   328   204    532    384
      Canada......................................... 1,120   584  2,995  2,175
      Australia......................................    --    --    679    271
      Azerbaijan.....................................    10    --    202     39
      Egypt..........................................    --    --  9,111  8,842
      Qatar..........................................    --    --    519    389
      Venezuela......................................    23    12  1,434  1,004
                                                      ----- ----- ------ ------
        Total........................................ 4,296 2,383 18,521 14,893
                                                      ===== ===== ====== ======
</TABLE>

                                       32
<PAGE>

                   DIRECTORS AND EXECUTIVE OFFICERS OF DEVON

Directors

  Our certificate of incorporation classifies the Devon board into three
classes with staggered terms of three years each. The number of directors will
be fixed from time to time by resolution of the Devon board. The Devon board is
currently set at fourteen members consisting of the following:

<TABLE>
<CAPTION>
                                                    Previous Board Expiration of
      Name                                      Age   Membership    First Term
      ----                                      --- -------------- -------------
      <S>                                       <C> <C>            <C>
      Thomas F. Ferguson(1)....................  63 Devon              2001
      David M. Gavrin(2).......................  64 Devon              2001
      Michael E. Gellert(3)....................  68 Devon              2002
      John A. Hagg.............................  51 Devon              2000
      Henry R. Hamman..........................  61 PennzEnergy        2000
      William J. Johnson(4)....................  64       --           2002
      Michael M. Kanovsky......................  50 Devon              2002
      Robert A. Mosbacher, Jr..................  48 PennzEnergy        2002
      J. Larry Nichols.........................  57 Devon              2000
      James L. Pate(5).........................  63 PennzEnergy        2002
      H.R. Sanders, Jr.........................  67 Devon              2002
      Terry L. Savage..........................  54 PennzEnergy        2001
      Brent Scowcroft..........................  74 PennzEnergy        2001
      Robert B. Weaver.........................  60 PennzEnergy        2000
</TABLE>
- --------
(1) Chairman of the Audit Committee. The Audit Committee also consists of one
    additional former Devon board member and one former PennzEnergy board
    member.
(2) Chairman of the Compensation and Stock Option Committee. The Compensation
    and Stock Option Committee also consists of one additional former Devon
    board member and two former PennzEnergy board members.
(3) Chairman of the Nominating Committee. The Nominating Committee also
    consists of one additional former Devon board member and two former
    PennzEnergy board members.
(4) Designated by PennzEnergy and mutually approved by PennzEnergy's chairman
    of the board and Devon's president prior to the merger. Mr. Johnson is a
    private consultant for the oil and gas industry and is President and a
    director of JonLoc Inc., an oil and gas company of which he and his family
    are the sole shareholders. He also serves as a director of Tesoro Petroleum
    and J. Ray McDermott, S.A. From 1991 to 1994, Mr. Johnson was President,
    Chief Operating Officer and a director of Apache Corporation.
(5) Chairman of the Board and Chairman of the Executive Committee. The
    Executive Committee consists of Mr. Pate and Mr. Nichols.

  Our certificate of incorporation provides, that until our annual stockholder
meeting in 2000, (1) the initial directors of Devon designated by pre-merger
Devon and their designated successors will nominate successors to, and fill any
vacancies in, that group of directors and (2) the initial directors of Devon
designated by PennzEnergy and their designated successors will nominate
successors to, and fill any vacancies in, that group of directors. One member
of the PennzEnergy group of directors must be a person mutually agreed to by
Devon's chairman and president. Our certificate provides that at and after the
annual stockholder meeting in 2000, a majority of the whole board, will
nominate successors and fill vacancies.

                                       33
<PAGE>

Executive Officers

  Our board will elect executive officers annually to serve in their respective
capacities until their successors are duly elected and qualified or until their
earlier resignation or removal. The following currently serve as executive
officers of Devon:

<TABLE>
<CAPTION>
                                                                     Pre-merger
                                                                       Company
      Name                 Age                Office                 Affiliation
      ----                 --- ------------------------------------- -----------
      <S>                  <C> <C>                                   <C>
      J. Larry Nichols...   57 President and Chief Executive Officer    Devon
      J. Michael Lacey...   53 Vice President--Operations and
                                Exploration                             Devon
      Duke R. Ligon......   58 Vice President--General Counsel          Devon
      Darryl G. Smette...   52 Vice President--Marketing and
                                Administrative Planning                 Devon
      H. Allen Turner....   46 Vice President--Corporate
                                Development                             Devon
      William T. Vaughn..   52 Vice President--Finance                  Devon
      Danny J. Heatly....   43 Controller                               Devon
      Gary L. McGee......   50 Treasurer                                Devon
      Marian J. Moon.....   49 Secretary                                Devon
</TABLE>


                                       34
<PAGE>

                CERTAIN UNITED STATES FEDERAL TAX CONSIDERATIONS
                          TO NON-UNITED STATES HOLDERS

General

  This is a summary of certain U.S. federal tax considerations of the ownership
and disposition of our common stock by a non-U.S. holder as we define that term
below. We assume in this summary that our common stock will be held as a
capital asset (generally, property held for investment). We do not discuss all
aspects of U.S. federal taxation that may be important to particular non-U.S.
holders in light of their individual investment circumstances, such as special
tax rules that would apply if, for example, a non-U.S. holder is a dealer in
securities, financial institution, bank, insurance company, tax-exempt
organization, partnership or owner of more than 5% of our common stock.

  For purposes of this summary, a "non-U.S. holder" means a holder of our
common stock who, for U.S. federal income tax purposes, is not a U.S. person.
The term "U.S. person" means any one of the following:

  . a citizen or resident of the U.S.;

  . a corporation, partnership, or other entity created or organized in the
    U.S. or under the laws of the U.S. or of any political subdivision of the
    U.S.;

  . an estate, the income of which is includible in gross income for U.S.
    federal income tax purposes regardless of its source; or

  . a trust, if (A) a court within the U.S. is able to exercise primary
    supervision over the administration of the trust and one or more U.S.
    persons have the authority to control all substantial decisions of the
    trust or (B) the trust has a valid election in effect under applicable
    U.S. Treasury Regulations to be treated as a U.S. person.

  This summary is based upon the Internal Revenue Code of 1986, as amended,
U.S. Treasury Regulations, judicial precedent, administrative rulings and
pronouncements, and other applicable authorities, all as in effect on the date
of this prospectus. These authorities are subject to differing interpretations
or change, possibly with retroactive effect. We have not sought, and will not
seek, any ruling from the U.S. Internal Revenue Service, which we refer to in
this summary as the IRS, with respect to the tax considerations discussed
below. There can be no assurance that the IRS will not take a position contrary
to the tax considerations discussed below or that any position taken by the IRS
would not be sustained.

  We strongly urge you to consult your tax advisor about the U.S. federal tax
consequences of holding and disposing of our common stock, as well as any tax
consequences that may arise under the laws of any foreign, state, local, or
other taxing jurisdiction.

Dividends

  Dividends paid to a non-U.S. holder will generally be subject to withholding
of U.S. federal income tax at a rate of 30% of the gross amount paid. If,
however, the dividend is effectively connected with the conduct of a trade or
business in the U.S. by the non-U.S. holder, the dividend will be subject to
U.S. federal income tax imposed on net income on the same basis that applies to
U.S. persons generally, and, for corporate holders under certain circumstances,
the branch profits tax.

  Non-U.S. holders should consult any applicable income tax treaties that may
provide for a reduction of, or exemption from, withholding taxes. Under
recently finalized U.S. Treasury Regulations, which in general will apply to
dividends that we pay after December 31, 2000, to obtain a reduced rate of
withholding under an income tax treaty, a non-U.S. holder generally will be
required to provide certification as to that non-U.S. holder's entitlement to
treaty benefits. These U.S. Treasury Regulations also provide special rules to
determine whether, for purposes of applying an income tax treaty, dividends
that we pay to a non-U.S. holder that is an entity should be treated as paid to
holders of interests in that entity.

                                       35
<PAGE>

Gain on Disposition

  A non-U.S. holder will generally not be subject to U.S. federal income tax,
including by way of withholding, on gain recognized on a sale or other
disposition of our common stock unless any one of the following is true:

  . the gain is effectively connected with the conduct of a trade or business
    in the U.S. by the non-U.S. holder;

  . the non-U.S. holder is a nonresident alien individual present in the U.S.
    for 183 or more days in the taxable year of the disposition and certain
    other requirements are met;

  . the non-U.S. holder is subject to tax pursuant to provisions of the U.S.
    federal income tax law applicable to certain U.S. expatriates; or

  . we are or have been during certain periods a "U.S. real property holding
    corporation" for U.S. federal income tax purposes.

  If we are or have been a U.S. real property holding corporation, a non-U.S.
holder will generally not be subject to U.S. federal income tax on gain
recognized on a sale or other disposition of our common stock provided that:

  . the non-U.S. holder does not hold, and has not held during certain
    periods, directly or indirectly, more than 5% of our outstanding common
    stock; and

  . our common stock is and continues to be traded on an established
    securities market for U.S. federal income tax purposes.

  We believe that our common stock will be traded on an established securities
market for this purpose in any quarter during which it is listed on the
American Stock Exchange.

  If we are or have been during certain periods a U.S. real property holding
corporation and the above exception does not apply, a non-U.S. holder will be
subject to U.S. federal income tax with respect to gain realized on any sale or
other disposition of our common stock as well as to a withholding tax,
generally at a rate of 10% of the proceeds. Any amount withheld pursuant to a
withholding tax will be creditable against a non-U.S. holder's U.S. federal
income tax liability.

  Gain that is effectively connected with the conduct of a trade or business in
the U.S. by the non-U.S. holder will be subject to the U.S. federal income tax
imposed on net income on the same basis that applies to U.S. persons generally,
and, for corporate holders under certain circumstances, the branch profits tax,
but will generally not be subject to withholding. Non-U.S. holders should
consult any applicable income tax treaties that may provide for different
rules.

United States Federal Estate Taxes

  Our common stock that is owned or treated as owned by an individual who is
not a citizen or resident of the U.S., as specifically defined for U.S. federal
estate tax purposes, on the date of that person's death will be included in his
or her estate for U.S. federal estate tax purposes, unless an applicable estate
tax treaty provides otherwise.

Information Reporting and Backup Withholding

  We must report annually to the IRS and to each non-U.S. holder the amount of
dividends that we paid to a holder, and the amount of tax that we withheld on
those dividends. This information may also be made available to the tax
authorities of a country in which the non-U.S. holder resides. Backup
withholding tax will generally not apply to dividends that we pay on our common
stock to a non-U.S. holder at an address outside the U.S.

                                       36
<PAGE>

  Payments of the proceeds of a sale or other taxable disposition of our common
stock by a U.S. office of a broker are subject to both backup withholding at a
rate of 31% and information reporting, unless the holder certifies as to its
non-U.S. holder status under penalties of perjury or otherwise establishes an
exemption. Information reporting requirements, but not backup withholding tax,
will also apply to payments of the proceeds of a sale or other taxable
disposition of our common stock by a foreign office of a U.S. broker or a
foreign broker with certain types of relationships to the U.S., unless the
broker has documentary evidence in its records that the holder is a non-U.S.
holder and certain other conditions are met or the holder otherwise establishes
an exemption.

  The U.S. Treasury Department has promulgated final regulations regarding the
withholding and information reporting rules discussed above. In general, those
regulations do not significantly alter the substantive withholding and
information reporting requirements, but unify current certification procedures
and forms and clarify reliance standards. The final U.S. Treasury Regulations
are generally effective for payments made after December 31, 2000, subject to
transition rules.

  Backup withholding is not an additional tax. Any amounts that we withhold
under the backup withholding rules will be refunded or credited against the
non-U.S. holder's U.S. federal income tax liability if certain required
information is furnished to the IRS.

                                       37
<PAGE>

                                  UNDERWRITERS

  Under the terms and subject to the conditions contained in an underwriting
agreement dated the date of this prospectus, the underwriters named below, for
whom Morgan Stanley & Co. Incorporated, J.P. Morgan Securities Inc.,
PaineWebber Incorporated, Bear, Stearns & Co. Inc. and Schroder & Co. Inc. are
acting as representatives, have severally agreed to purchase, and we have
agreed to sell to them, severally, the number of shares indicated below:

<TABLE>
<CAPTION>
                                                                       Number of
                                 Name                                   Shares
                                 ----                                  ---------
<S>                                                                    <C>
  Morgan Stanley & Co. Incorporated................................... 2,100,000
  J.P. Morgan Securities Inc.......................................... 2,100,000
  PaineWebber Incorporated............................................ 2,100,000
  Bear, Stearns & Co. Inc............................................. 1,350,000
  Schroder & Co. Inc.................................................. 1,350,000
  Credit Suisse First Boston Corporation..............................   120,000
  Dain Rauscher Incorporated..........................................    60,000
  Deutsche Bank Securities Inc........................................   120,000
  Goldman, Sachs & Co. ...............................................   120,000
  Johnson Rice & Co. L.L.C............................................    60,000
  Merrill Lynch, Pierce, Fenner & Smith Incorporated..................   120,000
  Petrie Parkman & Co.................................................    60,000
  Salomon Smith Barney Inc............................................   120,000
  Sanders Morris Mundy................................................    60,000
  Stephens Inc........................................................    60,000
                                                                       ---------
  Total............................................................... 9,900,000
                                                                       =========
</TABLE>

  The underwriters are offering the shares of common stock subject to their
acceptance of the shares from Devon and subject to prior sale. The underwriting
agreement provides that the obligations of the several underwriters to pay for
and accept delivery of the shares of common stock offered by this prospectus
are subject to the approval of certain legal matters by their counsel and to
certain other conditions. The underwriters are obligated to take and pay for
all the shares of common stock offered by this prospectus if any such shares
are taken. However, the underwriters are not required to take or pay for the
shares covered by the underwriters over-allotment option described below.

  The underwriters initially propose to offer part of the shares of common
stock directly to the public at the public offering price listed on the cover
page of this prospectus and part to certain dealers at a price that represents
a concession not in excess of $1.52 a share under the public offering price.
Any underwriter may allow, and such dealers may reallow, a concession not in
excess of $.10 a share to other underwriters or to certain dealers. After the
initial offering of the shares of common stock, the offering price and other
selling terms may from time to time be varied by the representatives.

  We have granted to the underwriters an option, exercisable for 30 days from
the date of this prospectus, to purchase up to an aggregate of 1,485,000
additional shares of common stock at the public offering price listed on the
cover page of this prospectus, less underwriting discounts and commissions. The
underwriters may exercise this option solely for the purpose of covering over-
allotments, if any, made in connection with the offering of the shares of
common stock offered by this prospectus. To the extent the option is exercised,
each underwriter will become obligated, subject to certain conditions, to
purchase about the same percentage of the additional shares of common stock as
the number listed next to the underwriter's name in the preceding table bears
to the total number of shares of common stock, listed next to the names of all
underwriters in the preceding table. If the underwriters' option is exercised
in full, the total price to the public would be $461,092,500, the total
underwriters' discounts and commissions would be $17,305,200 and total proceeds
to Devon, before expenses, would be $443,787,300.

                                       38
<PAGE>

  The common stock has been approved for listing, subject to official notice of
issuance, on the American Stock Exchange under the symbol "DVN."

  Each of Devon and J. Larry Nichols and John W. Nichols and their respective
spouses have agreed, for a period of 90 days following the date of this
prospectus, and each of Devon's other directors and executive officers have
agreed, for a period of 30 days following the date of this prospectus, that
they will not, without the prior written consent of Morgan Stanley & Co.
Incorporated on behalf of the underwriters:

  . offer, pledge, sell, contract to sell, sell any option or contract to
    purchase, purchase any option or contract to sell, grant any option,
    right or warrant to purchase, lend or otherwise transfer or dispose of
    directly or indirectly, any shares of common stock or any securities
    convertible into or exercisable or exchangeable for common stock; or

  . enter into any swap or other arrangement that transfers to another, in
    whole or in part, any of the economic consequences of ownership of the
    common stock;

whether any transaction described above is to be settled by delivery of common
stock or such other securities in cash or otherwise.

  The restrictions described in this paragraph do not apply to:

  . the sale of shares to the underwriters;

  . the issuance by Devon of shares of common stock upon the exercise of an
    option or a warrant or the conversion of a security outstanding on the
    date of this prospectus of which the underwriters have been advised in
    writing; or

  . transactions by any person other than Devon relating to shares of common
    stock or other securities acquired in open market transactions after the
    completion of the offering of the shares.

  In order to facilitate the offering of the common stock, the underwriters may
engage in transactions that stabilize, maintain or otherwise affect the price
of the common stock. Specifically, the underwriters may over-allot in
connection with the offering, creating a short position in the common stock for
their own account. In addition, to cover over-allotments or to stabilize the
price of the common stock, the underwriters may bid for, and purchase, shares
of common stock in the open market. Finally, the underwriting syndicate may
reclaim selling concessions allowed to an underwriter or a dealer for
distributing the common stock in the offering, if the syndicate repurchases
previously distributed common stock in transactions to cover syndicate short
positions, in stabilization transactions or otherwise. Any of these activities
may stabilize or maintain the market price of the common stock above
independent market levels. The underwriters are not required to engage in these
activities, and may end any of these activities at any time.

  From time to time, Morgan Stanley & Co. Incorporated and PaineWebber
Incorporated have provided, and continue to provide, investment banking
services to Devon, including acting as financial advisor to Devon in connection
with the merger with PennzEnergy.

  Devon and the underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act.

                                       39
<PAGE>

                                 LEGAL MATTERS

  Certain legal matters in connection with the shares of common stock being
offered by this prospectus will be passed upon for us by McAfee & Taft A
Professional Corporation. Certain legal matters in connection with this
offering will be passed upon for the underwriters by Andrews & Kurth L.L.P.

                                    EXPERTS

  The consolidated financial statements of Devon as of and for each of the
years ended December 31, 1998, 1997 and 1996 have been incorporated by
reference herein in reliance upon the reports of KPMG LLP, independent
certified public accountants, and Deloitte & Touche LLP and
PricewaterhouseCoopers LLP, chartered accountants, incorporated by reference in
this document, and upon the authority of said firms as experts in accounting
and auditing.

  The audited consolidated financial statements of PennzEnergy and its
subsidiaries incorporated by reference in this registration
statement/prospectus have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their report with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said report.

  Certain information with respect to our oil and gas reserves derived from the
reports of LaRoche Petroleum Consultants, Ltd., AMH Group Ltd., Paddock
Lindstrom & Associates Ltd. and John P. Hunter & Associates, Ltd., independent
consulting petroleum engineers, has been included and incorporated by reference
herein upon the authority of said firms as experts with respect to matters
covered by such reports and in giving such reports.

  Certain information with respect to PennzEnergy's oil and gas reserves
derived from the report of Ryder Scott Company, L.P., independent consulting
petroleum engineers, has been included and incorporated by reference herein
upon the authority of said firm as experts with respect to matters covered by
such report and in giving such report.

                      WHERE YOU CAN FIND MORE INFORMATION

  We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any reports, statements or
other information we file at the SEC's public reference rooms in Washington,
D.C., New York, New York and Chicago, Illinois. Please call the SEC at
1-800-SEC-0330 for further information on the public reference rooms. Our SEC
filings are also available to the public from commercial document retrieval
services and at the web site maintained by the SEC at "http://www.sec.gov".

  We filed with the SEC a registration statement on Form S-3 with respect to
the common stock offered by this prospectus. This prospectus is a part of that
registration statement. As allowed by SEC rules, this prospectus does not
contain all the information you can find in the registration statement or the
exhibits to the registration statement.

  The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to another document filed separately with the SEC. The
information incorporated by reference is deemed to be part of this prospectus,
except for any information superseded by information in, or incorporated by
reference in, this prospectus. This prospectus incorporates by

                                       40
<PAGE>

reference the documents set forth below that we or PennzEnergy have previously
filed with the SEC. These documents contain important information about our
companies and their finances.

    Devon SEC Filings

<TABLE>
<CAPTION>
(File No. 001-30176)                                      Period
- --------------------                        -----------------------------------
<S>                                         <C>
Current Report on Form 8-K                  Filed on August 18, 1999
Current Report on Form 8-K                  Filed on August 31, 1999
<CAPTION>
(File No. 001-10067)
- --------------------
<S>                                         <C>
Annual Report on Form 10-K                  Year ended December 31, 1998
Quarterly Report on Form 10-Q               Quarter ended March 31, 1999
Current Report on Form 8-K/A                Filed on February 2, 1999
Current Report on Form 8-K                  Filed on February 8, 1999
Current Report on Form 8-K                  Filed on February 22, 1999
Proxy Statement on Schedule 14A             Filed on April 9, 1999
Current Report on Form 8-K                  Filed on April 28, 1999
Current Report on Form 8-K                  Filed on May 21, 1999
Current Report on Form 8-K                  Filed on June 1, 1999
Proxy Statement on Schedule 14A             Filed on July 16, 1999
Current Report on Form 8-K                  Filed on July 22, 1999
Quarterly Report on Form 10-Q               Quarter ended June 30, 1999
Current Report on Form 8-K                  Filed on August 13, 1999

    PennzEnergy SEC Filings

<CAPTION>
(File No. 001-05591)
- --------------------
<S>                                         <C>
Part II, Item 8. "Financial Statements and  Fiscal year ended December 31, 1998
 Supplementary Data" of the Annual Report
 on Form 10-K
Part I, Item 1. "Financial Statements" of   Quarter ended March 31, 1999
 the Quarterly Report on Form 10-Q.
Proxy Statement on Schedule 14A             Filed on March 25, 1999
Part I, Item 1. "Financial Statements" of   Quarter ended June 30, 1999
 the Quarterly Report on Form 10-Q
Current Report on Form 8-K                  Filed on August 17, 1999
</TABLE>

  We are also incorporating by reference additional documents that we file with
the SEC between the date of this prospectus and the termination of the
offering.

  Documents incorporated by reference are available from us without charge,
excluding all exhibits unless we have specifically incorporated by reference an
exhibit in this prospectus. You may obtain documents incorporated by reference
in this prospectus by requesting them in writing, by e-mail or by telephone
from us at the following address:

  Devon Energy Corporation
  20 North Broadway, Suite 1500
  Oklahoma City, Oklahoma 73102-8260
  Attention: Corporate Secretary
  Tel: (405) 235-3611
  [email protected]

  You can also get more information by visiting our web site at
"http://www.devonenergy.com". Web site materials are not part of this
prospectus.

                                       41
<PAGE>

                        CAUTIONARY STATEMENT CONCERNING
                           FORWARD-LOOKING STATEMENTS

  We have made forward-looking statements in this document and in the documents
referred to in this document which are subject to risks and uncertainties,
including those discussed under the caption "Risk Factors." These statements
are based on the beliefs and assumptions of our management and on the
information currently available to them.

  Statements and calculations concerning oil and gas reserves and their present
value also may be deemed to be forward-looking statements in that they reflect
the determination, based on estimates and assumptions, that oil and gas
reserves may be profitably exploited in the future. When used or referred to in
this document, these forward-looking statements may be preceded by, followed
by, or otherwise include the words "believes," "expects," "anticipates,"
"intends," "plans," "estimates," "projects" or similar expressions, or
statements that certain events or conditions "will" or "may" occur.

  Except for our ongoing obligations to disclose material information as
required by the federal securities laws, we do not have any intention or
obligation to update forward-looking statements after we distribute this
document.

                                       42
<PAGE>

                        COMMONLY USED OIL AND GAS TERMS

  "Bbl" means barrel.

  "Bbl/d" means Bbl per day.

  "Bcf" means billion cubic feet.

  "Boe" means equivalent barrels of oil, calculated by converting gas to
equivalent Bbls. The U.S. convention for this conversion is six Mcf equals one
Boe.

  "Boe/d" means Boe per day.

  "Cash margin" means total revenues less cash expenses. Cash expenses are all
expenses other than the non-cash expenses of depreciation, depletion and
amortization, deferred effect of changes in foreign currency exchange rate on
subsidiary's long-term debt, reduction of carrying value of oil and gas
properties and deferred income tax expense.

  "MBbls" means thousand barrels.

  "MBoe" means thousand Boe.

  "Mcf" means thousand cubic feet.

  "Mcfe" means thousand equivalent cubic feet of gas, calculated by converting
oil and NGLs to equivalent Mcf. The U.S. convention for this conversion is one-
sixth Bbl equals one Mcfe.

  "MMBbls" means million barrels.

  "MMBoe" means million Boe.

  "MMBtu" means million British thermal units, a measure of heating value.

  "MMcf" means million cubic feet.

  "MMcf/d" means MMcf per day.

  "Modified EBITDA" means earnings before interest (including deferred effect
of changes in foreign currency exchange rate on subsidiary's long-term debt,
and distributions on preferred securities of subsidiary trust), taxes,
depreciation, depletion and amortization and reduction of carrying value of oil
and gas properties.

  "NGL" means natural gas liquids.

  "Oil" includes crude oil and condensate.

  "SEC 10% present value" is the pre-tax present value of future net cash flows
from proved reserves, discounted at 10% per year. Oil, gas and NGL prices used
to calculate future revenues are based on year-end prices held constant, except
where fixed and determinable price changes are provided by contractual
arrangements. Future development and production costs are also based on year-
end costs and assume the continuation of existing economic conditions.

  "Standardized measure of discounted future net cash flows" is the SEC 10%
present value defined above, less applicable income taxes.

  "Tcf" means trillion cubic feet.

                                       43
<PAGE>



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