X0303 4 2011-01-12 0 0001328650 Bronco Drilling Company, Inc. BRNC 0001335962 Graves Zachary M C/O BRONCO DRILLING COMPANY, INC. 16217 NORTH MAY AVENUE EDMOND OK 73013 0 1 0 0 Executive VP of Operations Common Stock 2011-01-12 4 A 0 102700 A 521943 D On January 12, 2011, the reporting person received 102,700 shares of restricted stock granted under the Bronco Drilling Company, Inc. 2006 Stock Incentive Plan, as amended (the "Plan"). Of these shares, 1/3 vest on February 25, 2012, 1/3 vest on February 25, 2013, and the remaining 1/3 vest on February 25, 2014; however, all unvested shares will vest immediately prior to a Change of Control (as defined in the Plan). Zachary M. Graves 2011-01-14