Sec Form 3 Filing - Ecofin Water & Power Opportunities plc @ Lonestar Resources US Inc. - 2016-07-05

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Ecofin Water & Power Opportunities plc 2. Issuer Name and Ticker or Trading Symbol Lonestar Resources US Inc. [ LONE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 10 HAREWOOD AVENUE, 3. Date of Earliest Transaction (MM/DD/YY) 07/05/2016 (Street) LONDON, ENGLANDNW1 6AA 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Voting Common Stock 4,174,259 ( 1 ) ( 2 ) I See Footnotes ( 1 ) ( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Ecofin Water & Power Opportunities plc 10 HAREWOOD AVENUE LONDON, ENGLANDNW1 6AA X EFR Guernsey Holding Ltd BNP PARIBAS HOUSE 1 ST JULIAN'S AVENUE ST PETER PORT , GUERNSEYGY1 1WA X Signatures Gemma Metson, Company Secretary, Ecofin Water & Power Opportunities plc 08/15/2016 Signature of Reporting Person Date Ben Morgan, Director, EFR Guernsey Holding Limited 08/15/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of the Issuer's Class A Voting Common Stock ("Shares") held directly by EFR Guernsey Holding Limited ("EFR"). ( 2 )Ecofin Water & Power Opportunities plc ("EWPO") is the sole shareholder of EFR, and as a result EWPO may be deemed to be beneficial owner of the Shares for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons (other than to the extent it directly holds Shares reported herein) disclaims beneficial ownership of the Shares held by the other Reporting Person, except to the extent of such Reporting Person's pecuniary interest therein. The filing of this Form 3 shall not be construed as an admission of either of the Reporting Persons (other than to the extent it directly holds Shares reported herein) is the beneficial owner of any of the Shares.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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