X0303 4 2009-08-12 0 0001328650 Bronco Drilling Company, Inc. BRNC 0001048462 WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 0 0 1 0 0001001391 DAVIDSON CHARLES E C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVE. GREENWICH CT 06830 0 0 1 0 0001048485 JACOBS JOSEPH C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVE. GREENWICH CT 06830 1 0 0 0 Common Stock, par value $0.01 2009-08-12 4 S 0 4810 4.3032 D 1756843 I By: Wexford Spectrum Trading Limited Common Stock, par value $0.01 2009-08-12 4 S 0 2757 4.3032 D 1007049 I By: Wexford Catalyst Investors LLC Common Stock, par value $0.01 2009-08-13 4 S 0 12130 4.2590 D 1744713 I By: Wexford Spectrum Trading Limited Common Stock, par value $0.01 2009-08-13 4 S 0 6953 4.2590 D 1000096 I By: Wexford Catalyst Investors LLC These securities are owned by Wexford Spectrum Trading Limited (?WST?) and Wexford Catalyst Investors LLC (?WCI?). Wexford Capital LP(?Wexford?), as manager or investment sub advisor of WCI and WST, may be deemed to beneficially own the securities. Charles E. Davidson (?Davidson?) and Joseph M. Jacobs (?Jacobs?) are the managing members of Wexford's general partner. Davidson and Jacobs may also be deemed to beneficially own the securities. Wexford, Davidson and Jacobs each disclaims 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 WCI or WST. Charles E. Davidson 2009-08-10 Joseph M. Jacobs 2009-08-10 Arthur Amron 2009-08-14