Exhibit 99.1

Press Release

Gulfport Energy Corporation Reports Fourth Quarter and Year-End 2013 Results

OKLAHOMA CITY (February 26, 2014) Gulfport Energy Corporation (NASDAQ: GPOR) today reported financial and operational results for the quarter and year ended December 31, 2013 and provided an update on its 2014 activities.

Financial and Operational Highlights

Financial Results

For the fourth quarter of 2013, Gulfport reported net income of $24.3 million on oil and gas revenues of $68.3 million, or $0.30 per diluted share. For the fourth quarter of 2013, EBITDA (as defined below) was $90.7 million and cash flow from operating activities before changes in working capital was $39.7 million.

For full year 2013, Gulfport reported net income of $153.2 million on oil and gas revenues of $262.2 million, or $1.97 per diluted share. For 2013, EBITDA (as defined below) was $388.4 million and cash flow from operating activities before changes in working capital was $170.8 million.

Gulfport’s 2013 fourth quarter financial results include an aggregate non-cash loss of $16.9 million due to a hedge ineffectiveness. Excluding the impact of the hedge ineffectiveness, oil and natural gas revenues for the fourth quarter of 2013 would have been $85.2 million. Gulfport’s 2013 fourth quarter financial results also include an aggregate gain of $54.7 million in connection with Gulfport’s equity interest in Diamondback Energy, Inc. (“Diamondback”), a NASDAQ Global Select Market listed company. Associated with this taxable income was $3.0 million of income tax expense. Excluding the effects of these items, adjusted net income for the fourth quarter of 2013 would have been $4.5 million, or $0.05 per diluted share. Adjusted net income for the fourth quarter of 2013 was negatively impacted by higher than anticipated general and administrative expense, increased interest expense and lower oil realizations.

Production

For the fourth quarter of 2013, net production was 674,504 barrels of oil, 4,175,096 thousand cubic feet (“MCF”) of natural gas and 6,851,332 gallons of natural gas liquids (“NGL”), or 1,533,480 BOE. Net production for the fourth quarter of 2013 by region was 984,528 BOE in the Utica Shale, 346,736 BOE at West Cote Blanche Bay, 195,002 BOE at Hackberry and an aggregate of 7,214 BOE in the Bakken, Niobrara and other areas. For 2013, Gulfport recorded net production of 2,316,827 barrels of oil, 8,891,183 MCF of natural gas and 13,416,485 gallons of NGL, or 4,118,131 BOE.

Gulfport’s 2013 fourth quarter realized prices include an aggregate non-cash loss of $16.9 million due to a hedge ineffectiveness. Before the impact of derivatives, realized prices for the fourth quarter of 2013, including transportation costs, were $96.35 per barrel of oil, $3.45 per MCF of natural gas and $1.35 per gallon of NGL, for a total equivalent of $57.82 per BOE. Before the impact of derivatives, realized prices for the full-year 2013, including transportation costs, were $104.50 per barrel of oil, $3.73 per MCF of natural gas and $1.27 per gallon of NGL, for a total equivalent of $70.99 per BOE.

GULFPORT ENERGY CORPORATION

PRODUCTION SCHEDULE

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Subsequent to the fourth quarter of 2013, net production for the month of January 2014 averaged approximately 21,745 BOEPD. As of February 25, 2014, production for the month of February averaged approximately 25,771 BOEPD. Gulfport continues to estimate first quarter of 2014 average production to be relatively flat to the Company’s 2013 exit rate of 27,780 BOEPD.

Derivatives

The table below sets forth the company’s hedging positions as of February 26, 2014.

GULFPORT ENERGY CORPORATION

COMMODITY DERIVATIVES—HEDGE POSITION AS OF FEBRUARY 26, 2014

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Year-End 2013 Reserves

Gulfport reported year-end 2013 total proved reserves of 38.43 million BOE, consisting of 14.02 million barrels (“MMBBL”) of oil and natural gas liquids and 146.45 billion cubic feet (“BCF”) of natural gas. At year-end 2013, 64.8% of Gulfport’s proved reserves were classified as proved developed reserves. Gulfport’s year-end total proved reserves increased 177% over 2012. See “General Reserve Information” below.

GULFPORT ENERGY CORPORATION

DECEMBER 31, 2013 NET RESERVES

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The following table provides Gulfport’s 2013 total proved reserves by major operating areas:

GULFPORT ENERGY CORPORATION

DECEMBER 31, 2013 TOTAL PROVED RESERVES

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In accordance with SEC guidelines (“SEC Case”), at year-end 2013, reserve calculations were based on the average first day of the month price for the prior 12 months. The prices utilized for Gulfport’s year-end 2013 reserve report were $96.78 per barrel of oil and $3.67 per MMBTU of natural gas, in each case as adjusted by lease for transportation fees and regional price differentials. Utilizing these prices, the present value of Gulfport’s total proved reserves discounted at 10% (referred to as “PV-10”) was $697 million at December 31, 2013. The PV-10 value of our total proved and probable reserves was $1.3 billion at December 31, 2013. PV-10 is a non-GAAP measure because it excludes income tax effects. Management believes 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 sophisticated investors in evaluating oil and gas companies. PV-10 is not a measure of financial or operating performance under GAAP. PV-10 should not be considered as an alternative to the standardized measure as defined under GAAP. We have included a reconciliation of PV-10 of proved reserves to the most directly comparable GAAP measure-standardized measure of discounted future net cash flows. With respect to the pre-tax PV-10 amounts for probable reserves, there does not exist any directly comparable GAAP measure, and such amount does not purport to present the fair value of Gulfport’s probable reserves.

GULFPORT ENERGY CORPORATION

DECEMBER 31, 2013 PV-10

The following table reconciles the standardized measure of future net cash flows to the PV-10 value of Gulfport’s proved reserves:

GULFPORT ENERGY CORPORATION

DECEMBER 31, 2013 PV-10 RECONCILIATION

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Grizzly Oil Sands Reserves and Resource

Third party engineers GLJ Petroleum Consultants Ltd. (“GLJ”) has provided an assessment report to Grizzly estimating that effective December 31, 2013, Grizzly has 67 million barrels of proved reserves, 204 million barrels of probable reserves, and 3.1 billion barrels of best estimate (P50) contingent resource.

The following table summarizes GLJ’s determination of Grizzly’s reserves and resources effective December 31, 2013.

The GLJ reserve and resource assessment report was prepared in accordance with National Instrument 51-101 using the best practices detailed in the Canadian Oil and Gas Evaluation Handbook and not in accordance with the SEC guidelines. For important qualifications and limitations relating to these oil sands reserves and resources, please see “General Reserve Information” and “Oil Sands Reserves & Resources Notes” below.

Operational Update

Utica Shale

In the Utica Shale, Gulfport spud 52 gross (39 net) wells during 2013 and at present, Gulfport has seven horizontal rigs drilling in the play.

Gulfport has entered into a binding letter of intent with Rhino Resources Partners LP (“Rhino”) to acquire approximately 8,200 net acres and approximately 1,000 BOEPD of production in the Utica Shale of Eastern Ohio for a total purchase price of $185 million, subject to closing adjustments. Gulfport plans to purchase all rights, title, and interest in leasehold and mineral interests covered by all oil and gas leases owned by Rhino in the Utica Shale in Eastern Ohio, together with all wells, production, data, equipment, contracts permits and privileges relating to the ownership of such properties. Gulfport is the operator of substantially all of this acreage. Proforma for this transaction, since November 2013 Gulfport has increased its acreage position in the core of the play, adding approximately 18,080 net acres, bringing the company’s total acreage position to approximately 165,430 net acres under lease in the Utica Shale. Gulfport plans to fund these acreage acquisitions from existing cash on hand.

Gulfport announced today it has entered into a comprehensive marketing services agreement with BP North America Gas & Power (“BP”), the leading energy marketer in North America. Under the agreement, Gulfport has engaged BP to market all Utica Shale production for the Company through multiple firm outlets while offering access to numerous pricing hubs. Gulfport is provided flow assurance by joining efforts with BP, allowing the Company to focus on core competencies.

Canadian Oil Sands

In the Canadian Oil Sands, Grizzly achieved first steam at its first SAGD facility at Algar Lake during the fourth quarter of 2013. Continuous operation of the main boiler and steam injection into the reservoir commenced in January 2014. Grizzly expects first production at Algar Lake during the first quarter of 2014. At Grizzly’s May River project area, during the fourth quarter of 2013, Grizzly submitted an initial 12,000 barrel per day SAGD development application with the regulatory authorities covering the eastern portion of the May River lease.

In 2013, Grizzly continued to advance its rail marketing strategy. Construction of a 15,000 bbl/d truck to rail transloading facility at Windell Alberta, proximate to its May River lease, commenced during the fourth quarter. Construction is expected to be completed and ready for operation to ship Algar Lake production by the end of the first quarter in 2014. Engineering design work was advanced and development permits filed during the fourth quarter of 2014 for the 40,000 bbl/d rail/barge Paulina transloading terminal project located on the lower Mississippi River adjacent to the Gulf Coast refinery market.

Southern Louisiana

At its West Coast Blanche Bay and the Hackberry fields, Gulfport drilled 40 wells during 2013, completing 36 wells as productive with two wells still being drilled and one waiting on completion at year-end and one well as nonproductive. In addition, Gulfport performed 150 recompletions at the fields. At present, Gulfport has two rigs active in Southern Louisiana drilling ahead on the third and fourth wells of 2014.

Executive and Director Search Process

In connection with the Company’s search for a Chief Executive Officer, Gulfport’s Board of Directors has engaged Preng & Associates to assist the Board in its search. The search process will include a review of internal and external candidates.

In addition, Gulfport’s Board of Directors has engaged Preng & Associates to advise in the Board’s search for directors to fill existing vacancies and a potentially expanded Board. The Board is actively pursuing candidates with industry experience and strong technical orientation that will be additive to Gulfport’s current Board of Directors and assist the Company in driving operational excellence and long-term stockholder value.

Strategic Alternatives for Oilfield Services Interests

Gulfport is currently evaluating strategic alternatives with respect to certain oilfield service entities in which Gulfport owns an interest. A Registration Statement on Form S-1 has been submitted on a confidential basis to the Securities and Exchange Commission in connection to these interests. Gulfport may choose to pursue an initial public offering of these interests later this year subject to market conditions.

2014 Guidance

Gulfport continues to estimate full year 2014 production to be in the range of 50,000 BOEPD to 60,000 BOEPD. Capital expenditures for exploration and production activities in 2014 are estimated to be in the range of $675 million to $725 million. Additionally, Gulfport anticipates spending approximately $225 million to $275 million on leasehold acquisitions in the Utica Shale during 2014.

GULFPORT ENERGY CORPORATION

COMPANY GUIDANCE

Presentation

An updated presentation has been posted to the Company’s website. The presentation can be found at www.gulfportenergy.com under the “Webcasts & Presentations” section on the “Investor Relations” page. Information on the Company’s website does not constitute a portion of this press release.

Conference Call

Gulfport will hold a conference call on Thursday, February 27, 2014 at 8:00 a.m. CST to discuss its fourth quarter and full-year 2013 financial and operational results and to provide an update on the Company’s recent activities. Interested parties may listen to the call via Gulfport’s website at www.gulfportenergy.com or by calling toll-free at 877-291-1287 or 973-409-9250 for international callers. The passcode for the call is 35466437. A replay of the call will be available for two weeks at 855-859-2056 or 404-537-3406 for international callers. The replay passcode is 35466437. The webcast will be archived on the Company’s website and can be accessed on the Company’s “Investor Relations” page.

About Gulfport

Gulfport is an Oklahoma City-based independent oil and natural gas exploration and production company with its principal producing properties located in the Utica Shale of Eastern Ohio and along the Louisiana Gulf Coast. In addition, Gulfport holds a sizeable acreage position in the Alberta Oil Sands in Canada through its 24.9% interest in Grizzly Oil Sands ULC, has an equity interest in Diamondback Energy Inc., a NASDAQ Global Select Market listed company, and has an interest in an entity that operates in Southeast Asia, including the Phu Horm gas field in Thailand.

Forward Looking Statements

This press release includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements, other than statements of historical facts, included in this press release that address activities, events or developments that Gulfport expects or anticipates will or may occur in the future, future capital expenditures (including the amount and nature thereof), business strategy and measures to implement strategy, competitive strength, goals, expansion and growth of Gulfport’s business and operations, plans, market conditions, references to future success, reference to intentions as to future matters and other such matters are forward-looking statements. These statements are based on certain assumptions and analyses made by Gulfport in light of its experience and its perception of historical trends, current conditions and expected future developments as well as other factors it believes are appropriate in the circumstances. However, whether actual results and developments will conform with Gulfport’s expectations and predictions is subject to a number of risks and uncertainties, general economic, market, credit or business conditions; the opportunities (or lack thereof) that may be presented to and pursued by Gulfport; competitive actions by other oil and gas companies; changes in laws or regulations; and other factors, many of which are beyond the control of Gulfport. Information concerning these and other factors can be found in the Company’s filings with the Securities and Exchange Commission, including its Forms 10-K, 10-Q and 8-K. Consequently, all of the forward-looking statements made in this news release are qualified by these cautionary statements and there can be no assurances that the actual results or developments anticipated by Gulfport will be realized, or even if realized, that they will have the expected consequences to or effects on Gulfport, its business or operations. Gulfport has no intention, and disclaims any obligation, to update or revise any forward-looking statements, whether as a result of new information, future results or otherwise.

Non-GAAP Financial Measures

EBITDA is a non-GAAP financial measure equal to net income, the most directly comparable GAAP financial measure, plus interest expense, income tax expense, accretion expense and depreciation, depletion and amortization. Cash flow from operating activities before changes in operating assets and liabilities is a non-GAAP financial measure equal to cash provided by operating activities before changes in operating assets and liabilities. Adjusted net income available is a non-GAAP financial measure equal to pre-tax net income plus loss from hedge ineffectiveness, less income in connection with Gulfport’s equity interest in Diamondback and income tax expense. The Company has presented EBITDA because it uses EBITDA as an integral part of its internal reporting to measure its performance and to evaluate the performance of its

senior management. EBITDA is considered an important indicator of the operational strength of the Company’s business. EBITDA eliminates the uneven effect of considerable amounts of non-cash depletion, depreciation of tangible assets and amortization of certain intangible assets. A limitation of this measure, however, is that it does not reflect the periodic costs of certain capitalized tangible and intangible assets used in generating revenues in the Company’s business. Management evaluates the costs of such tangible and intangible assets and the impact of related impairments through other financial measures, such as capital expenditures, investment spending and return on capital. Therefore, the Company believes that EBITDA provides useful information to its investors regarding its performance and overall results of operations. EBITDA, adjusted net income, and cash flow from operating activities before changes in operating assets and liabilities are not intended to be performance measures that should be regarded as an alternative to, or more meaningful than, either net income as an indicator of operating performance or to cash flows from operating activities as a measure of liquidity. In addition, EBITDA, adjusted net income and cash flow from operating activities before changes in operating assets and liabilities are not intended to represent funds available for dividends, reinvestment or other discretionary uses, and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP. The EBITDA, adjusted net income and cash flow from operating activities before changes in operating assets and liabilities presented in this press release may not be comparable to similarly titled measures presented by other companies, and may not be identical to corresponding measures used in the Company’s various agreements.

General Reserve Information Notes:

Prior to 2010, the Securities and Exchange Commission generally permitted oil and gas companies, in their filings, to disclose only proved reserves that a company has demonstrated by actual production or conclusive formation tests to be economically and legally producible under existing economic and operating conditions. Beginning with year-end reserves for 2009, the SEC permits the optional disclosure of probable and possible reserves. We have elected not to disclose our probable and possible reserves in our filings with the SEC. We may use the terms “unrisked resource potential,” “unrisked resource,” “contingent resource,” or “EUR,” or other descriptions of volumes of hydrocarbons to describe volumes of resources potentially recoverable through additional drilling or recovery techniques that the SEC’s guidelines prohibit us from including in filings with the SEC. “Unrisked resource potential,” “unrisked resource,” “contingent resource,” or “EUR,” do not reflect volumes that are demonstrated as being commercially or technically recoverable. Even if commercially or technically recoverable, a significant recovery factor would be applied to these volumes to determine estimates of volumes of proved reserves. Accordingly, these estimates are by their nature more speculative than estimates of proved reserves and accordingly are subject to substantially greater risk of being actually realized by the Company. The methodology for “unrisked resource potential,” “unrisked resource,” “contingent resource,” or “EUR,” may also be different than the methodology and guidelines used by the Society of Petroleum Engineers and is different from the SEC’s guidelines for estimating probable and possible reserves.

Oil Sands Reserves and Resource Notes:

Investor & Media Contact:

Paul Heerwagen

pheerwagen@gulfportenergy.com

405-242-4888

Jessica Wills

jwills@gulfportenergy.com

405-242-4421

GULFPORT ENERGY CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

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GULFPORT ENERGY CORPORATION

CONSOLIDATED BALANCE SHEETS

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GULFPORT ENERGY CORPORATION

RECONCILIATION OF EBITDA AND CASH FLOW

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GULFPORT ENERGY CORPORATION

RECONCILIATION OF ADJUSTED NET INCOME

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