X0306 4 2016-09-26 1 0001661920 Lonestar Resources US Inc. LONE 0001387869 ECOFIN LTD 15 BUCKINGHAM STREET LONDON X0 WC2N 6DU UNITED KINGDOM 0 0 1 0 Class A Voting Common Stock 2016-09-26 4 J 0 4174259 A 4174259 I See Footnotes 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"). 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. 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. /s/ Vincent Barnouin, Chief Executive Officer 2016-11-07