X0304 4 2012-02-02 0 0001358831 LEGACY RESERVES LP LGCY 0001385058 Horne Paul T 303 W. WALL STREET, SUITE 1400 MIDLAND TX 79701 0 1 0 0 EVP of Operations Phantom Units 2012-02-02 4 A 0 4797 0.00 A 2015-02-18 Units 4797 31587 D Phantom Units 2012-02-02 4 A 0 8894 0.00 A 2015-02-18 Units 8894 40481 D Each phantom unit represents the economic equivalent of a unit representing a limited partner interest in Legacy Reserves LP. The phantom units reported on this Form 4 vest annually in one-third increments beginning on February 18, 2013 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. The number of phantom units that vest each year for the three-year vesting period is subject to the achievement of certain objective, performance-based criteria during the fiscal year prior to the applicable vesting date. If none or only a portion of phantom units of a particular tranche vest as a result of target performance levels not being met, such number of phantom units that fail to vest will be forfeited. Includes the remaining 12,936 phantom units, 13,854 phantom units and 13,691 phantom units from the phantom units granted on February 18, 2010, February 18, 2011 and February 2, 2012, respectively. Executive Vice President of Operations of Legacy Reserves GP, LLC, the general partner of Legacy Reserves LP. /s/ Paul T. Horne 2012-02-03