Top 10 drilling permits by company

(Jan. 1 through Jan. 8) Exxon Mobil

20 Pioneer Natural Resources 19 Encana

12 Endeavor Energy Sources 11 Crownquest Operating 8 Apache Corp.

8 Carrizo Oil & Gas

7

Rio Oil and Gas

7 Callon Petroleum Co.

7

EOG Resources

7

Source: Railroad Commission of Texas