Specimen Certificate for Shares of Common Stock




 Exhibit 4.1 
  
 

 
  
 BDC 
 BRONCO DRILLING COMPANY, INC. 
 THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA, JERSEY CITY, NJ OR NEW YORK, NY 
 INCORPORATED UNDER
THE LAWS 
 OF THE STATE OF DELAWARE 
 CUSIP 112211 10 7 
 SEE REVERSE FOR CERTAIN DEFINITIONS 
 This Certifies that is the record holder of 
 FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $.01 PAR VALUE, OF 
 BRONCO DRILLING COMPANY, INC. 
 (hereinafter called the “Corporation”) transferable on the books of
the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar. 

WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. 
 Dated: 
 CHIEF
FINANCIAL OFFICER AND TREASURER 
 COUNTERSIGNED AND REGISTERED: 
 EQUISERVE TRUST COMPANY, N.A. 
 TRANSFER AGENT AND REGISTRAR 
 BY 
 AUTHORIZED SIGNATURE 
 AMERICAN BANK NOTE COMPANY 
 711 ARMSTRONG LANE COLUMBIA, TENNESSEE 38401 (931) 388-3003 
 SALES: P. SHEERIN 773-523-8171 
 / ETHER 7 / LIVE JOBS / B / BRONCO 20580 FC 
 PRODUCTION COORDINATOR: TODD DEROSSETT 931-490-1720
PROOF OF JULY 21, 2005 
 BRONCO DRILLING COMPANY, INC. 
 TSB 20580 FC 
 Operator: Ron 
 Rev. 2 
 PLEASE INITIAL THE APPROPRIATE SELECTION FOR THIS PROOF: OK AS IS OK WITH CHANGES MAKE CHANGES AND SEND ANOTHER PROOF 
 Colors Selected for Printing: Intaglio prints in SC-7 Dark Blue. 
 COLOR:
This proof was printed from a digital file or artwork on a graphics quality, color laser printer. It is a good representation of the color as it will appear on the final product. However, it is not an exact color rendition, and the final printed
product may appear slightly different from the proof due to the difference between the dyes and printing ink. 








 

 
  
 BRONCO DRILLING
COMPANY, INC. 
 The Corporation shall furnish without charge to each stockholder who so requests a statement of the powers,
designations, preferences and relative, participating, optional or other special rights of each class of stock of the Corporation or series thereof and the qualifications, limitations or restrictions of such preferences and/or rights. Such requests
shall be made to the Corporation’s Secretary at the principal office of the Corporation. 
 The following abbreviations,
when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
 TEN COM — as tenants in common 
 TEN ENT — as tenants by the
entireties 
 JT TEN — as joint tenants with right of survivorship and not as tenants in common 
 UNIF GIFT MIN ACT — Custodian 
 (Cust) (Minor) 
 under Uniform Gifts to Minors 
 Act 
 (State)

 UNIF TRF MIN ACT — Custodian (until age ) 
 (Cust) 
 under
Uniform Transfers 
 (Minor) 
 to Minors Act 
 (State) 
 Additional abbreviations may also be used though not in the above list. 
 FOR VALUE RECEIVED, hereby sell, assign and transfer unto 
 PLEASE INSERT SOCIAL SECURITY OR OTHER 
 IDENTIFYING NUMBER OF ASSIGNEE

 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) 
 Shares of the common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint 
 Attorney to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.

 Dated 
 NOTICE: 
 THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF
THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. 
 Signature(s) Guaranteed

 By 
 THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO
S.E.C. RULE 17Ad-15. 
 AMERICAN BANK NOTE COMPANY 
 711 ARMSTRONG LANE 
 COLUMBIA, TENNESSEE 38401 (931) 388-3003 
 SALES: P. SHEERIN 773-523-8171 
 / ETHER 7 / LIVE JOBS / B / BRONCO 20580 BK 
 PRODUCTION COORDINATOR: TODD DEROSSETT 931-490-1720 
 PROOF OF JULY 15, 2005

 BRONCO DRILLING COMPANY, INC. 
 TSB 20580 BK 
 Operator: Ron 
 New 
 PLEASE
INITIAL THE APPROPRIATE SELECTION FOR THIS PROOF: OK AS IS OK WITH CHANGES MAKE CHANGES AND SEND ANOTHER PROOF