Eclipse Resources Corporation Launches Initial Public Offering

State College, Pennsylvania, June 9, 2014 – Eclipse Resources Corporation (“Eclipse Resources” or the “Company”) today announced that it has launched its initial public offering of 30,300,000 shares of common stock at an anticipated initial offering price between $27.00 and $30.00 per share pursuant to a registration statement on Form S-1 filed previously with the U.S. Securities and Exchange Commission (“SEC”). The Company is offering 21,500,000 shares of its common stock and the selling stockholders named in the registration statement are offering 8,800,000 shares of common stock. The selling stockholders have granted the underwriters a 30-day option to purchase up to an additional 4,545,000 shares of the Company’s common stock. The common stock has been approved for listing on the New York Stock Exchange under the ticker symbol “ECR.”

Citigroup Global Markets Inc., Goldman, Sachs & Co., and Morgan Stanley & Co. LLC are acting as joint lead book-running managers for the offering. Barclays Capital Inc., BMO Capital Markets Corp., Deutsche Bank Securities Inc., KeyBanc Capital Markets Inc. and RBC Capital Markets, LLC are also acting as book-running managers for the offering. The offering of these securities will be made only by means of a written prospectus. A copy of the preliminary prospectus may be obtained, when available, from:

Citigroup
c/o Broadridge Financial Solutions
1155 Long Island Avenue
Edgewood, NY 11717

Telephone: 1-800-831-9146 / Goldman, Sachs & Co.
Attn: Prospectus Department
200 West Street
New York, NY 10282

Telephone: 1-866-471-2526 / Morgan Stanley & Co. LLC
Attn: Prospectus Department
180Varick Street, 2nd floor
New York, NY 10281
Barclays Capital Inc.
c/o Broadridge Financial Solutions
1155 Long Island Avenue
Edgewood, NY 11717

Telephone: 1-888-603-5847 / BMO Capital Markets Corp.
Attn: Equity Syndicate Department
3 Times Square
New York, NY 10036

Telephone: 1-800-414-3627 / Deutsche Bank Securities Inc.
Attn: Prospectus Group
60 Wall Street
New York, NY 10005

Telephone: 1-800-503-4611
KeyBanc Capital Markets Inc.
Attn: Prospectus Delivery Department
127 Public Square, 4th Floor
Cleveland, OH 44114
Telephone: 1-800-859-1783 / RBC Capital Markets, LLC
Attn: Prospectus Department
200 Vesey Street, 8th Floor
New York, NY 10281

Telephone: 1-866-375-6829

About Eclipse Resources Corporation

Eclipse Resources is an independent exploration and production company engaged in the acquisition and development of oil and natural gas properties in the Appalachian Basin, including the Utica and Marcellus Shales.

Important Information

A registration statement relating to these securities has been filed with the SEC but has not yet been declared effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. The registration statement may be obtained free of charge at the SEC’s website at under the registrant’s name, “Eclipse Resources Corporation.” This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or jurisdiction.

This release includes “forward-looking statements” within the meaning of federal securities laws. Such forward-looking statements are subject to a number of risks and uncertainties, many of which are beyondthe Company’s control. All statements, other than historical facts included in this release, are forward-looking statements. All forward-looking statements speak only as of the date of this release. Although the Company believes that the plans, intentions and expectations reflected in or suggested by the forward-looking statements are reasonable, there is no assurance that these plans, intentions or expectations will be achieved. Therefore, actual outcomes and results could materially differ from what is expressed, implied or forecast in such statements.

We caution you that these forward-looking statements are subject to all of the risks and uncertainties, most of which are difficult to predict and many of which are beyond our control, incident to the exploration for and development, production, gathering and sale of natural gas, NGLs and oil. These risks include, but are not limited to, legal and environmental risks, drilling and other operating risks, regulatory changes, commodity price volatility, inflation, lack of availability of drilling, production and processing equipment and services, counterparty credit risk, the uncertainty inherent in estimating natural gas, NGLs and oil reserves and in projecting future rates of production, cash flow and access to capital, and the timing of development expenditures.

Contact:

Eclipse Resources Corporation

Julia Williams, 814-308-9754

Director, Investor Relations and Communications