X0304 4 2012-02-18 0 0001358831 LEGACY RESERVES LP LGCY 0001385051 Brown Cary D 303 W. WALL STREET, SUITE 1400 MIDLAND TX 79701 1 1 1 0 Chairman and CEO Units representing limited partner interests 2012-02-18 4 M 0 14479 0.00 A 968744 D Units representing limited partner interests 2012-02-18 4 D 0 14479 29.67 D 954265 D Units representing limited partner interests 4425080 I See footnote Phantom Units 2012-02-18 4 M 0 14479 0.00 D Units 14479 69645 D Each phantom unit represents the economic equivalent of a unit representing a limited partner interest in Legacy Reserves LP. Reflects the closing price of the units on February 17, 2012. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these units in this report shall not be deemed an admission of beneficial ownership of all of the reported units for the purposes of Section 16 or for any other purpose. Includes 4,301,408 units held by Moriah Properties, Ltd. ("Moriah Properties"), 33,672 units owned by Moriah Resources, Inc. ("Moriah Resources") and 90,000 units held by Moriah Realty Partners, LLC ("Moriah Realty"). Moriah Properties, Moriah Resources and Moriah Realty are entities owned and controlled by Mr. Dale A. Brown and Mr. Cary D. Brown. Phantom units vest annually in one-third increments on February 18th of each applicable year and are payable in cash or, at the discretion of the compensation committee of the board of directors of the general partner of the Issuer, in units. Pursuant to the achievement of certain objective, performance-based criteria, 2,780 phantom units and 2,172 phantom units, or 32.27% each of the phantom units eligible to vest for the year ended December 31, 2011, granted on February 18, 2010 and February 18, 2011, respectively, vested. Accordingly, the remaining aggregate 10,395 phantom units eligible to vest during 2012 with respect to the February 18, 2010 and February 18, 2011 phantom unit grants did not vest and were forfeited. Additionally, 5,398 phantom units (the second tranche of the 2010 subjective phantom unit grant) and 4,129 phantom units (the first tranche of the 2011 subjective phantom unit grant), vested. Includes the remaining 14,013 phantom units, 21,717 phantom units and 33,915 phantom units from the phantom units granted on February 18, 2010, February 18, 2011 and February 2, 2012, respectively. Chairman and Chief Executive Officer of Legacy Reserves GP, LLC, the general partner of Legacy Reserves LP. /s/ Cary D. Brown 2012-02-21