QuickLinks -- Click here to rapidly navigate through this document


Exhibit 12.1

ANTERO RESOURCES CORPORATION
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(in thousands)

 
  2009   2010   2011   2012   2013   Nine Months Ended
September 30, 2014
 

Pre-tax income (loss) from continuing operations

  $ (60,197 ) $ 1,155   $ 456,485   $ 346,505   $ 162,023   $ 140,574  

Fixed charges

    36,348     56,736     74,743   $ 97,877   $ 137,343   $ 112,348  
                           

Total adjusted earnings available for payment of fixed charges

  $ (23,849 ) $ 57,891   $ 531,228   $ 444,382   $ 113,156   $ 252,922  
                           
                           

Fixed charges

                                     

Interest expense, including amortization of debt related expenses

  $ 36,053   $ 56,463   $ 74,404   $ 97,510   $ 136,617   $ 111,057  

Rental expense representative of interest factor

  $ 295   $ 273   $ 339   $ 367   $ 726   $ 1,291  
                           

Total fixed charges

  $ 36,348   $ 56,736   $ 74,743   $ 97,877   $ 137,343   $ 112,348  
                           
                           

Ratio of earnings to fixed charges

    NA (1)   1.02 X   7.11 X   4.54 X   2.18 X   2.25 X

(1)
Earnings are deficient to cover fixed charges by $60,197.



QuickLinks