Exhibit 99.1

Earthstone Energy, Inc. Reports Second Quarter 2017 Results

The Woodlands, Texas, August 9, 2017 – Earthstone Energy, Inc. (NYSE: ESTE) (“Earthstone”, the “Company”, “we” or “us”), today announced financial and operating results for the three and six month periods ended June 30, 2017.

Second Quarter 2017 Highlights

(1)See “Reconciliation of Non-GAAP Financial Measure” section below.

Selected Financial Data (unaudited)

Impairments to Oil and Natural Gas Properties

For the three and six months ended June 30, 2017, the Company recorded non-cash impairment charges of $63.0 million to its proved oil and natural gas properties and $3.6 million to its unproved oil and natural gas properties.  This was a direct result of significant downward strip price changes at June 30, 2017 compared to December 31, 2016.

Financial Position

As of June 30, 2017, the Company had $16.7 million in cash and $70 million outstanding under its credit facility with borrowing base of $150 million.

Management Comments

Frank A. Lodzinski, President and Chief Executive Officer of Earthstone Energy, Inc., commented, “As previously announced, we successfully closed our business combination with Bold Energy III LLC on May 9^th and our integration of the companies is complete. Our production for the second quarter was over 7,900 Boepd and on a combined pro forma basis was approximately 10,600 Boepd.  In April, we initiated drilling and completion operations on our operated Midland Basin and Eagle Ford acreage. We intend to begin our Midland completion program later this month.  Our Midland Basin position now totals approximately 27,000 net acres and we are excited about the production results we are seeing in our newer wells, which are meeting or exceeding our targeted type curves. We will continue to focus our efforts on the development of our acreage in the Midland Basin and will continue to pursue additional opportunities to further expand our position.”  

Conference Call Details

Earthstone is hosting a conference call on Thursday, August 10, 2017 at 11:00 a.m. Eastern (10:00 a.m. Central) to discuss its second quarter 2017 results and current operations.  Investors and analysts are invited to participate in the call by dialing 877-407-8035 for domestic calls or 201-689-8035 for international calls, in both cases asking for the Earthstone conference call.

A replay of the call will be available on the Company’s website and by telephone until 11:00 a.m. Eastern (10:00 a.m. Central), Thursday, August 24, 2017.  The number for the replay is 877-481-4010 for domestic calls or 919-882-2331 for international calls, using Replay ID: 19392.

About Earthstone

Earthstone Energy, Inc. is a growth-oriented, independent energy company engaged in developing and operating oil and gas properties.  The Company’s primary assets are located in the Midland Basin of west Texas, the Eagle Ford trend of south Texas, and the Williston Basin of North Dakota.  Earthstone is listed on the New York Stock Exchange under the symbol “ESTE.” For more information, visit the Company’s website at www.earthstoneenergy.com.

Forward-Looking Statements

This release contains 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”). Statements that are not strictly historical statements constitute forward-looking statements and may often, but not always, be identified by the use of such words such as “expects,” “believes,” “intends,” “anticipates,” “plans,” “estimates,” “potential,” “possible,” or “probable” or statements that certain actions, events or results “may,” “will,” “should,” or “could” be taken, occur or be achieved. The forward-looking statements

include statements about the expected benefits of the recently completed business combination with Bold Energy III LLC (the “Transaction”) to Earthstone and its stockholders, the expected future reserves, production, financial position, business strategy, revenues, earnings, costs, capital expenditures and debt levels of the combined company, and plans and objectives of management for future operations. Forward-looking statements are based on current expectations and assumptions and analyses made by Earthstone and its management in light of experience and perception of historical trends, current conditions and expected future developments, as well as other factors appropriate under the circumstances. However, whether actual results and developments will conform to expectations is subject to a number of material risks and uncertainties, including but not limited to: Earthstone’s ability to integrate its combined operations of the Transaction successfully and achieve anticipated benefits from it; risks relating to any unforeseen liabilities of the combined company; declines in oil, natural gas liquids or natural gas prices; the level of success in exploration, development and production activities; adverse weather conditions that may negatively impact development or production activities; the timing of exploration and development expenditures; inaccuracies of reserve estimates or assumptions underlying them; revisions to reserve estimates as a result of changes in commodity prices; impacts to financial statements as a result of further impairment write-downs; risks related to the level of indebtedness and periodic redeterminations of the borrowing base under Earthstone’s credit agreement; Earthstone’s ability to generate sufficient cash flows from operations to meet the internally funded portion of its capital expenditures budget; Earthstone’s ability to obtain external capital to finance exploration and development operations and acquisitions; the ability to successfully complete any potential asset dispositions and the risks related thereto; the impacts of hedging on results of operations; uninsured or underinsured losses resulting from oil and natural gas operations; Earthstone’s ability to replace oil and natural gas reserves; and any loss of senior management or technical personnel. Earthstone’s annual report on Form 10-K for the year ended December 31, 2016, quarterly reports on Form 10-Q, recent current reports on Form 8-K, and other Securities and Exchange Commission (“SEC”) filings discuss some of the important risk factors identified that may affect Earthstone’s business, results of operations, and financial condition. Earthstone undertakes no obligation to revise or update publicly any forward-looking statements except as required by law.

Contact

Scott Thelander

Director of Finance

Earthstone Energy, Inc.

1400 Woodloch Forest Drive, Suite 300

The Woodlands, TX 77380

281-298-4246

EARTHSTONE ENERGY, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited) (In thousands, except share amounts)

EARTHSTONE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited) (In thousands, except share and per share amounts)

EARTHSTONE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited) (In thousands)

Earthstone Energy, Inc.
Reconciliation of Non-GAAP Financial Measure
Unaudited

Non-GAAP Financial Measure

The non-GAAP financial measure of Adjusted EBITDAX, as calculated by us below, is intended to provide readers with meaningful information that supplements our financial statements prepared in accordance with GAAP (Accounting Principles Generally Accepted in the U.S.). This disclosure may not be comparable to similarly titled measures used by other companies. Further, this non-GAAP measure should only be considered in conjunction with financial statements and disclosures prepared in accordance with GAAP and should not be considered in isolation or as a substitute for GAAP measures, such as net income or loss, operating income or loss, or any other GAAP measure of financial position or results of operations.

I. Adjusted EBITDAX

Adjusted EBITDAX is used as a supplemental financial measure by our management and by external users of our financial statements, such as investors, commercial banks and others, to assess our operating performance compared to that of other companies in our industry, without regard to financing methods, capital structure or historical costs basis.  We define “Adjusted EBITDAX” as net income (loss) plus, when applicable, (gain) loss on sale of assets; accretion; impairment expense; depletion, depreciation and amortization; interest expense; interest income; transaction costs; exploration expense; rig idle expense; unrealized (gain) loss on derivatives; stock based compensation; and income tax (benefit) expense.

Our Adjusted EBITDAX should not be considered an alternative to net income (loss), operating income (loss), cash flow provided by (used in) operating activities or any other measure of financial performance or liquidity presented in accordance with GAAP.  Our Adjusted EBITDAX may not be comparable to similarly titled measures of another company because all companies may not calculate Adjusted EBITDAX in the same manner.  

The following table provides a reconciliation of net income (loss) to Adjusted EBITDAX for the periods indicated: