X0203 3 2008-07-23 0 0001328650 Bronco Drilling Company, Inc. BRNC 0001048462 WEXFORD CAPITAL LLC 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 0 0 1 0 0001415179 Wexford Catalyst Investors LLC 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 0 0 1 0 0001415180 Wexford Spectrum Trading LTD 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 0 0 1 0 Common Stock 1202864 I Wexford Catalyst Investors LLC Common Stock 2100714 I Wexford Spectrum Trading Limited These securities are owned directly by Wexford Alpha Trading Limited (?Alpha?), Wexford Catalyst Investors LLC (?Catalyst?), and Wexford Spectrum Trading Limited (?Spectrum? and together with Alpha and Catalyst, the ?Companies?). Catalyst and Spectrum own the securities set forth herein. Alpha owns 71,200 shares of common stock of the Issuer. Wexford Capital LLC (?Wexford?) may be deemed to beneficially own all the securities which are owned by the Companies. Charles Davidson (?Davidson?) and Joseph Jacobs (?Jacobs?) as managing members of Wexford may be deemed to beneficially own all the securities which are owned by the Companies. Wexford, Davidson and Jacobs each disclaim beneficial ownership of the securities reported hereby and this report shall not be deemed as an admission that they are the beneficial owners of such securities except in the case of Davidson and Jacobs to the extent of their interests in certain direct and indirect members or partners of the Companies. Arthur Amron, Partner and Secretary of Wexford Capital LLC 2008-07-25 Charles E. Davidson 2008-07-25 Joseph Jacobs 2008-07-25