Sundance Energy Australia Limited Releases Quarterly Activities Report Asean Business & Finance Sundance Energy Australia Limited November 1, 20170 DENVER, Nov. 01, 2017 (GLOBE NEWSWIRE) — Sundance Energy Australia Limited (ASX:SEA) (NASDAQ:SNDE) (“Sundance” or the “Company”), a U.S. onshore oil and gas exploration and production company focused in the Eagle Ford in South Texas, reported its third quarter 2017 operating results. Sundance produced approximately 9,292 Boe/d (net) during the third quarter 2017 and has averaged 7,635 Boe/d (net) year-to-date. Production for the quarter was impacted by Hurricane Harvey which caused shut downs at substantially all midstream and downstream facilities servicing Sundance’s production. The hurricane reduced production by approximately 1,000 boe/d during the quarter. Additionally, the storm delayed the Company’s end of year completions program by approximately 30 days. Net production for the third quarter was 854,887 Boe, as compared to net production of 559,808 Boe for the same quarter in 2016, an approximate 53% increase, and net production of 627,805 for the second quarter of 2017, an approximate 36% increase. The average estimated third quarter price received per barrel was $48.19, compared to the average West Texas Intermediate (“WTI”) price of $48.16, and per Boe was $39.34. During the fourth quarter Louisiana Light Sweet crude (“LLS”) has traded at approximately a $5-$6 premium to WTI representing approximately a $3 increase in LLS compared to WTI from the third quarter. Sundance’s oil is priced at LLS less applicable transportation and quality differentials. During the quarter the Company completed 6 wells in McMullen County and has four drilled but uncompleted (“DUC”) wells in McMullen and Atascosa County that are scheduled for completion in Q4 2017. Upon completion of the four remaining DUCs, the Company will have finished its 14 well 2017 completion program. Six wells began production during the quarter; the three well Teal‐Hoskins pad and the three well Libersat pad with total completed lateral length of 48,279’. The Teal-Hoskins three well pad had an average initial production rate per well of 1,735 Boe/d, at an average of 190 boe/d per 1,000 feet. The wells are currently producing 73% oil and 87% liquids. The Libersat three well pad had an average initial production rate of 1,644 boe/d, per well at an average of 237 boe/d per 1,000 feet. The wells are currently producing 51% oil and 73% liquids. These results represent some of the Company’s best wells drilled to date. Importantly, the Teal-Hoskins B EFS 4H and the Libersat EFS 3UH, both drilled in the upper lower Eagle Ford, are outperforming the Company’s type curve. The Company believes these initial production results substantially proves up the upper lower Eagle Ford where the Company has 147 gross remaining locations. In Dimmit County the Red Ranch EFS 32HC and the Shook EFS 11HU continue to perform materially above expectations. The Red Ranch EFS 32HC has averaged approximately 670 boe/d for the first 170 days of production and the Shook EFS 11HU has averaged approximately 415 boe/d for the first 170 days of production. Well Name County SEA Working Interest SEA Net Revenue Interest Completed Lateral Length % Oil* Peak 24‐Hour (boe/d) 30‐Day (boe/d) 60‐Day (boe/d) 90‐Day (boe/d) Teal Hoskins EFS 1H McMullen 100% 75% 9,245 90% 1,864 1,135 1,029 935 Teal Hoskins A EFS 2H McMullen 100% 75% 8,842 88% 1,645 1,209 1,083 946 Teal Hoskins B EFS 4H McMullen 100% 75% 9,366 89% 1,696 1,125 1,010 887 Libersat EFS 1H McMullen 99% 74% 7,058 86% 1,433 886 705 691 Libersat EFS 2H McMullen 99% 74% 6,631 91% 1,750 1,258 1,156 989 Libersat EFS 3UH McMullen 99% 74% 7,137 92% 1,751 1,181 1,037 882 *Based on the longest IP period Grace Ford, COO, commented, “We are very pleased with the well results being generated from our current completion designs in both McMullen and Dimmit Counties. In McMullen County we are seeing strong production profiles and, to date, no interference between the lower lower and upper lower Eagle Ford. In Dimmit County the scientific data collected in 2015 and 2016 has resulted in a step change in well performance. In particular, the Red Ranch well is performing economically in line with our McMullen assets opening up additional highly economic drilling inventory.” Eric McCrady, CEO, commented, “Our operations team’s focus on improving well performance continues to show results and has resulted in some of our best wells to date across our acreage position. To date, our development program is on track with our expectations in 2017 although initial production from the four drilled but uncompleted wells has been pushed back approximately 30 days due to Hurricane Harvey. Finalization of the Vitol agreement, in addition to the recent increase in LLS pricing, has improved oil price realizations compared to WTI and provided more than adequate liquidity to execute this year’s business plan.” Sundance plans to report third quarter 2017 financial results in mid‐November. A separate announcement will provide additional details on the release date and a conference call to review the results. For more information, please contact: United States Eric McCrady, Managing Director Tel: +1 (303) 543 5703 Australia Mike Hannell, Chairman Tel: +61 8 8363 0388 About Sundance Energy Australia Limited Sundance Energy Australia Limited (“Sundance” or the “Company”) is an Australian-based, independent energy exploration company, with a wholly owned US subsidiary, Sundance Energy Inc., located in Denver, Colorado, USA. The Company is focused on the acquisition and development of large, repeatable oil and natural gas resource plays in North America. Current activities are focused in the Eagle Ford. A comprehensive overview of the Company can be found on Sundance’s website at www.sundanceenergy.net Summary Information The following disclaimer applies to this document and any information contained in it. The information in this release is of general background and does not purport to be complete. It should be read in conjunction with Sundance’s periodic and continuous disclosure announcements lodged with ASX Limited that are available at www.asx.com.au and Sundance’s filings with the Securities and Exchange Commission available at www.sec.gov. Forward Looking Statements This release may contain forward-looking statements. These statements relate to the Company’s expectations, beliefs, intentions or strategies regarding the future. These statements can be identified by the use of words like “anticipate”, “believe”, “intend”, “estimate”, “expect”, “may”, “plan”, “project”, “will”, “should”, “seek” and similar words or expressions containing same. These forward-looking statements reflect the Company’s views and assumptions with respect to future events as of the date of this release and are subject to a variety of unpredictable risks, uncertainties, and other unknowns. Actual and future results and trends could differ materially from those set forth in such statements due to various factors, many of which are beyond our ability to control or predict. These include, but are not limited to, risks or uncertainties associated with the discovery and development of oil and natural gas reserves, cash flows and liquidity, business and financial strategy, budget, projections and operating results, oil and natural gas prices, amount, nature and timing of capital expenditures, including future development costs, availability and terms of capital and general economic and business conditions. Given these uncertainties, no one should place undue reliance on any forward looking statements attributable to Sundance, or any of its affiliates or persons acting on its behalf. Although every effort has been made to ensure this release sets forth a fair and accurate view, we do not undertake any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.