Sec Form 4 Filing - ECOFIN LTD @ Lonestar Resources US Inc. - 2016-09-26

FORM 4 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person ECOFIN LTD 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) 15 BUCKINGHAM STREET 3. Date of Earliest Transaction (MM/DD/YY) 09/26/2016 (Street) LONDON, X0WC2N 6DU 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 09/26/2016 J 4,174,259 ( 1 ) ( 2 ) ( 3 ) A 4,174,259 I See Footnotes ( 1 ) ( 2 ) ( 3 )

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

Other Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer ECOFIN LTD 15 BUCKINGHAM STREET LONDON, X0WC2N 6DU X Signatures /s/ Vincent Barnouin, Chief Executive Officer 11/07/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Ecofin Limited ("Ecofin") is reporting beneficial ownership of 4,174,259 shares of the Issuer's Class A Voting Common Stock ("Shares"), which as of September 26, 2016 were held directly by EFR Guernsey Holding Limited ("EFR"). ( 2 )On September 26, 2016, Ecofin served as investment manager to EFR's parent company, and as a result Ecofin may be deemed as of such date to be beneficial owner of the Shares for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended ("Exchange Act"). Due to a change of the terms of the investment management agreement between the parent of EFR and Ecofin on September 26, 2016, under which Ecofin may be entitled to a performance fee in respect of the Shares held directly by EFR, Ecofin may be deemed as of September 26, 2016 to have a pecuniary interest (as defined in Rule 16a-1(a)(2) of the Exchange Act) in the Shares for purposes of Section 16 of the Exchange Act. Ecofin disclaims beneficial ownership of the Shares held by EFR, except to the extent of Ecofin's pecuniary interest therein. The filing of this Form 4 shall not be construed as an admission that Ecofin is or was the beneficial owner of any of the Shares. ( 3 )Due to a subsequent decision by the board of EFR's parent to restrict Ecofin's control as investment manager and to exercise sole investing and voting power over the Shares held directly by EFR, Ecofin is no longer deemed to have beneficial ownership of the Shares held directly by EFR under Section 13(d) of the Exchange Act as of October 21, 2016. As a result, Ecofin is no longer subject to Section 16 as of October 21, 2016.

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.