Exhibit 99.1

SUMMARY HISTORICAL AND PRO FORMA CONSOLIDATED

FINANCIAL AND OPERATING DATA

The following summary consolidated financial data should be read together with our most recent Annual Report on Form 10-K, as amended, for the year ended December 31, 2011 and Quarterly Report on Form 10-Q for the three months ended March 31, 2012. The summary consolidated statement of operations data below for the years ended December 31, 2011 and 2010 and the summary balance sheet data for the years ended December 31, 2011 and 2010 have been derived from our audited consolidated financial statements that are included in this offering memorandum. The summary consolidated pro forma statement of operations data below for the three months ended March 31, 2012, and the summary consolidated pro forma balance sheet data as of March 31, 2012, have been derived from our unaudited consolidated financial statements that are included in this offering memorandum. See “Selected Historical Consolidated Financial Data” for our summary consolidated statement operations data for the three months ended March 31, 2012. Our unaudited consolidated financial statements are prepared on the same basis as our audited consolidated financial statements and, in the opinion of management, all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation have been included. Historical results are not necessarily indicative of results to be expected in the future, and operating results for the three months ended March 31, 2012 are not necessarily indicative of results that may be expected for the full year or future periods.

The summary unaudited pro forma condensed consolidated financial data are based on our unaudited historical consolidated financial statements appearing elsewhere in this offering memorandum and give effect to the TransTex Acquisition, the ArcLight Investment, the Baytex Acquisition, the sale of the notes and the concurrent offering of our common stock and the application of the net proceeds therefrom as described under “Use of Proceeds” as if such events had occurred on March 31, 2012 for purposes of the pro forma balance sheet and as if the Eagle Operating Acquisition and the Utica Acreage Acquisition had occurred on January 1, 2011 for purposes of the statement of operations. The pro forma adjustments used in the preparation of the pro forma condensed consolidated financial information are based upon available information and assumptions that we believe are reasonable; however, we can provide no assurance that the assumptions are correct. The pro forma condensed consolidated financial information is for illustrative and informational purposes only and is not intended to represent or be indicative of what our financial condition or results of operations would have been had the TransTex Acquisition, the ArcLight Investment, the Baytex Acquisition, the sale of the notes and the concurrent offering of our common stock and the application of the net proceeds therefrom as described under “Use of Proceeds” occurred on March 31, 2012 for purposes of the pro forma balance sheet and, together with the Eagle Operating Acquisition and the Utica Acreage Acquisition, as of January 1, 2011 for purposes of the statement of operations. The pro forma condensed consolidated financial information also should not be considered representative of our future financial condition or results of operations.

This information is a summary and should be read in conjunction with “Use of Proceeds,” “Capitalization,” “Selected Historical Consolidated Financial Data,” “Management’s Discussion and

1

Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes included elsewhere in this offering memorandum.

(1)         Certain prior period balances were reclassified to conform to the March 31, 2012 presentation. Such reclassifications had no impact on net income, working capital, or equity previously reported.

(2)         The summary pro forma financial statements reflect adjustments for depreciation, depletion, and accretion expense of $15.6 million for the year ended December 31, 2011 and $5.8 million and $4.7 million for the three months ended March 31, 2011 and 2012, respectively, as a result of treating the acquisitions and ancillary transactions as if they had occurred on January 1, 2011. Depletion was calculated using the units of production. The summary pro forma financial statements also reflect adjustments for interest expense of $37.8 million for the year ended December 31, 2011 and $11.2 million and $8.0 million for the three months ended March 31, 2011 and 2012, respectively, as a result of treating the acquisitions and ancillary transactions as if they had occurred January 1, 2011.

2

Reconciliation of Adjusted EBITDAX Data:

(1)         Adjusted EBITDAX is a non-GAAP financial measure. For a definition of Adjusted EBITDAX, see “Non-GAAP Financial Measures.”

(1)         Certain amounts have been reclassified to conform with current presentation of discontinued operations.

3

SUMMARY PRO FORMA RESERVES AND PRO FORMA OPERATING DATA

The following table presents summary data with respect to our estimated net proved oil and natural gas reserves as of the dates indicated. Cawley, Gillespie & Associates, Inc. and AJM Deloitte and Touche, LLP, our independent petroleum engineers, prepared our estimated reserves as of December 31, 2011 and Cawley, Gillespie & Associates, Inc. prepared our estimated reserves as of December 31, 2010. Our estimated reserves as of March 31, 2012, and the estimated pro forma reserves for the Baytex Acquisition are based on our internal estimates. Reserve estimates are inherently imprecise and remain subject to revisions based on production history, results of additional exploration and development drilling, results of secondary and tertiary recovery applications, prevailing oil and natural gas prices and other factors. Reserve estimates based on our internal estimates may be subject to more imprecision than if prepared by a third party. You should read the notes following the table below and our consolidated financial statements and related notes included elsewhere in this offering circular in conjunction with the following reserve estimates.

(1)          The oil reserves include oil and condensate. Oil volumes are expressed in barrels. Gas volumes are expressed in thousands of standard cubic feet (Mcf). A barrel of oil equivalent conversion ratio of 6 Mcf: 1 barrel has been used.

(2)          We calculated the present value of estimated future net revenues as of March 31, 2012 using the 12 month arithmetic average first of month price from April 2011 through March 2012. The average resulting priced used as of March 31, 2012 was $98.15 per barrel of oil and $3.71 per MMbtus for gas. We calculated the present value of estimated future net revenues as of December 31, 2011 and 2010 using the 12 month arithmetic average first of month price January through December for the respective years. The average resulting price used as of December 31, 2011 was $96.19 per barrel of oil and $4.11 per MMbtus of gas. The average resulting price used as of December 31, 2009 was $79.43 per barrel of oil and $4.37 per MMbtus of gas.

(3)          The Present Value of Estimated Future Net Revenues, Discounted at 10% (“PV-10”) is a non-GAAP financial measure. For a definition of PV-10, see “Non-GAAP Financial Measures.” See Supplemental Oil and Gas Reserve Information (Unaudited) following our audited financial statements for the years ended December 31, 2011 and 2010. PV-10 is considered a non-GAAP financial measure under SEC regulations

4

because it does not include the effects of future income taxes, as is required in computing the standardized measure of discounted future net cash flows.

(4)          The estimated reserves at December 31, 2011 and 2010 were prepared by Cawley, Gillespie & Associates, Inc. using constant prices and costs, and conforms to Item 1202(a)(8) of Regulation S-K and other rules of the Securities and Exchange Commission (SEC) and the estimated reserves at December 31, 2011 were prepared by AJM Deloitte and Touche, LLP in accordance with generally accepted petroleum engineering practices and procedures detailed within the Canadian Oil and Gas Evaluation Handbook, set out by the Society of Petroleum Evaluation Engineers as well as the Society of Petroleum Engineers’ Standards Pertaining to the Estimation and Auditing of Oil and Gas Reserves and conform to the reserve definitions as set forth in the SEC’s Regulation S-X Part 210.4-10(a) and as clarified in subsequent SEC Staff Accounting Bulletins.

(5)          Includes the pro forma impact of the Baytex Acquisition.

5

Non-GAAP Measures; Reconciliations

This offering memorandum contains certain financial measures that are non-GAAP measures. We have provided reconciliations within this offering memorandum of the non-GAAP financial measures to the most directly comparable GAAP financial measures. These non-GAAP financial measures should be considered in addition to, but not as a substitute for, measures for financial performance prepared in accordance with GAAP that are presented in this offering memorandum.

PV-10 is the present value of the estimated future cash flows from estimated total proved reserves after deducting estimated production and ad valorem taxes, future capital costs and operating expenses, but before deducting any estimates of future income taxes. The estimated future cash flows are discounted at an annual rate of 10% to determine their “present value”. We believe PV-10 to be an important measure for evaluating the relative significance of our oil and gas properties and that the presentation of the non-GAAP financial measure of PV-10 provides useful information to investors because it is widely used by professional analysts and investors in evaluating oil and gas companies. Because there are many unique factors that can impact an individual company when estimating the amount of future income taxes to be paid, we believe the use of a pre-tax measure is valuable for evaluating the Company. We believe that PV-10 is a financial measure routinely used and calculated similarly by other companies in the oil and gas industry. However, PV-10 should not be considered as an alternative to the standardized measure as computed under GAAP.

The standardized measure of discounted future net cash flows relating to our total proved oil and gas reserves is as follows (in thousands):

6

UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL INFORMATION

The unaudited pro forma condensed consolidated financial statements are based on our historical consolidated financial statements appearing elsewhere in this offering memorandum and give effect to the TransTex Acquisition, the ArcLight Investment, the Baytex Acquisition, the sale of the notes and the concurrent offering of our common stock and the application of the net proceeds therefrom as described under “Use of Proceeds” as if such events had occurred on March 31, 2012 for purposes of the unaudited pro forma condensed consolidated balance sheet and had occurred, including the Eagle Operating Acquisition and the Utica Acreage Acquisition on January 1, 2011 for purposes of the unaudited pro forma condensed consolidated statement of operations. The pro forma adjustments used in the preparation of the pro forma condensed consolidated financial information are based upon available information and assumptions that we believe are reasonable. The pro forma condensed consolidated financial information is for illustrative and informational purposes only and is not intended to represent or necessarily be indicative of what our financial condition or results of operations would have been had the TransTex Acquisition, the ArcLight Investment, the Baytex Acquisition, the sale of the notes and the concurrent offering of our common stock and the application of the net proceeds therefrom as described under “Use of Proceeds” as if such events had occurred on March 31, 2012 for purposes of the unaudited pro forma condensed consolidated balance sheet and had occurred, including the Eagle Operating Acquisition and the Utica Acreage Acquisition on January 1, 2011 for purposes of the unaudited pro forma condensed consolidated statement of operations. The pro forma condensed consolidated financial information also should not be considered representative of our future financial condition or results of operations.

This information should be read in conjunction with “Summary—Recent Developments,” “Capitalization,” “Selected Historical Consolidated Financial Data,” “Management’s Discussion and Analysis of Financial Condition and Results of Operation” and our consolidated financial statements and related notes included elsewhere in this offering memorandum.

The Unaudited Pro Forma Balance Sheet reflects the preliminary adjustments and allocation of purchase price to record the estimated fair values of the assets and liabilities acquired in the acquisitions of the assets from Baytex, TransTex Gas Services, LP, Eagle Operating, Inc. and for the Utica Shale Acreage.

The final entries, and the resulting effect on Magnum Hunter’s balance sheet as well as items in Magnum Hunter’s income statements, may differ based on the actual determination of the fair values of the assets acquired and liabilities assumed. The historical financial information presented for Baytex, TransTex Gas Services, L.P., Eagle Operating, Inc. and the Utica Shale Acreage have not been audited or reviewed by any outside accounting firm.

Transaction costs related to these acquisitions will be recorded as expenses in the periods in which these costs are incurred. These expenses are not included in the Unaudited Pro Forma Combined Income Statements.

The Unaudited Pro Forma Combined Financial Data should be read in conjunction with the notes thereto and with the consolidated financial statements of Magnum Hunter and the notes thereto.

The Unaudited Pro Forma Combined Financial Data are not indicative of the financial position or results of operations of Magnum Hunter which would actually have occurred if the transactions described above had occurred at the dates presented or which may be obtained in the future. In addition, future results may vary significantly from the results reflected in such statements due to normal oil and natural gas production declines, changes in prices paid for oil and natural gas, future acquisitions, drilling activity and other factors.

7

The unaudited Pro Forma Combined Financial Data includes financial information received from Baytex, TransTex Gas Services, and Eagle Operating and such financial information has been accepted and incorporated as presented without independent verification of such financial information.

8

UNAUDITED PRO FORMA COMBINED BALANCE SHEET

As of March 31, 2012

(in thousands, except share and per-share data)

See accompanying notes to Unaudited Pro Forma Combined Financial Data

9

UNAUDITED PRO FORMA COMBINED INCOME STATEMENT

Three months Ended March 31, 2012

(in thousands, except shares and per share data)

See accompanying notes to Unaudited Pro Forma Combined Financial Data

10

UNAUDITED PRO FORMA COMBINED INCOME STATEMENT

Year Ended December 31, 2011

(in thousands, except shares and per share data)