EX-99 2 c78529_99.htm ADDITIONAL EXHIBITS Form 4 Joint Filer Information
Exhibit 99
Form 4 Joint Filer Information
     
Name:
  YORKTOWN ENERGY PARTNERS VI, L.P.
 
    
Address:
  410 PARK AVENUE, 19TH FLOOR
NEW YORK, NY 10022-4407
 
    
Designated Filer:
  YORKTOWN VI ASSOCIATES LLC
 
    
Issuer & Ticket Symbol:
  CONCHO RESOURCES INC. [CXO]
 
    
Date of Event Requiring Statement:
  12/16/2008
         
Signature:  YORKTOWN ENERGY PARTNERS VI, L.P.
 		  
  By:   Yorktown VI Company LP,    
    its general partner   
     
    By:   Yorktown VI Associates LLC,    
      its general partner   
       
     
    By:   /s/ W. Howard Keenan, Jr.    
      Member   
     
Date:
  12/17/2008