UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
 Pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

For the month of April 2018

Commission File Number 000-55246

Sundance Energy Australia Limited

(Translation of registrant’s name into English)

633 17th Street, Suite 1950
Denver, CO  80202

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x                                Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): o

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes o                        No x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): n/a

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Exhibit 99.1

NYMEX strip (varying) pricing as of 31 December 2017, adjusted by lease for transportation fees and regional price differentials, used for the Reserves is shown in the following table:

Footnotes and Definitions

Operating costs used in this report are based on operating expense records of Sundance.

Capital costs used in this report were provided by Sundance and are based on authorizations for expenditure and actual costs from recent activity.

Future net revenue is after deductions for Sundance’s share of production taxes, ad valorem taxes, capital costs, and operating expenses but before consideration of any income taxes.

“PV10” is defined as the discounted Net Revenues of the Company’s reserves using a 10% discount factor.

Reserves are estimated in US dollars. US dollars are converted at 1.2809 USD/AUD.

“1P Reserves” or “Proved Reserves” are defined as Reserves which have a high likelihood or a 90% probability that the quantities actually recovered will equal or exceed the estimate.

“2P Reserves” or “Probable Reserves” are defined as Reserves which have at least a 50% probability that the quantities actually recovered will equal or exceed the estimate.

“boe” is defined as barrel of oil equivalent, using the ratio of 6 mcf of Natural Gas to 1 bbl of Crude Oil. This is based on energy conversion and does not reflect the current economic difference between the value of 1 MCF of Natural Gas and 1 bbl of Crude Oil.

“m” is defined as a thousand.

“mmboe” is defined as a million barrels of oil equivalent.

For more information, please contact:

About Sundance Energy Australia Limited

Sundance Energy Australia Limited (ASX: SEA) is an Adelaide-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 and Mississippian/Woodford.

A comprehensive overview of the Company can be found on Sundance’s website at www.sundanceenergy.com.au.

Competent Person’s Statement

This presentation contains information on Sundance Energy’s reserves which has been reviewed by Stephen E. Gardner, a Professional Engineer employed by Ryder Scott Company, L.P. who practices under State of Colorado license number 44720. Mr. Gardner has consented to the inclusion of this information in the form and context in which it appears.

Summary Information

The following disclaimer applies to this document and any information contained in it (the “Information”). The Information in this presentation is of general background and does not purport to be complete. It should be read in conjunction with Sundance’s other periodic and continuous disclosure announcements lodged with ASX Limited, which are available at www.asx.com.au. You are advised to read this disclaimer carefully before reading or making any other use of this document or any information contained in this document. In accepting this document, you agree to be bound by the following terms and conditions including any modifications to them.

Forward Looking Statements

This presentation includes forward-looking statements. These statements relate to Sundance’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.

The forward-looking statements reflect the Company’s views and assumptions with respect to future events as of the date of this presentation 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. 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 presentation 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.

Exhibit 99.2

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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.

The 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 our 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. Sundance does not undertake any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

For more information, please contact:

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