| Name of Subsidiary             |   | Jurisdiction of Incorporationor Organization |   | Assumed Names UnderWhich Subsidiary Does Business         |   |
|------------------------------------------|--------|-------------------------------------------------------------|--------|------------------------------------------------------------------------------------|--------|
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Operating Company, LLC |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Finance Corp.          |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| AER      Pipeline Construction, Inc..    |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| AIC,      LLC                            |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Anthem      Securities, Inc..            |   | Pennsylvania                                                |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      America, LLC                  |   | Pennsylvania                                                |   | Atlas      Energy Resources, LLC (in OH)Atlas      Energy Resources (in WV and TN) |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Indiana, LLC           |   | Indiana                                                     |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Michigan, LLC          |   | Delaware                                                    |   | Atlas      Energy Resources (in MI)                                                |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Ohio, LLC              |   | Ohio                                                        |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Energy Tennessee, LLC         |   | Pennsylvania                                                |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Gas & Oil Company, LLC    |   | Michigan                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Noble, LLC                    |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Atlas      Resources, LLC                |   | Pennsylvania                                                |   | Atlas      Energy Resources (in WV and TN)                                         |   |
|                                     |   |                                                        |   |                                                                               |   |
| REI-NY,      LLC                         |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Resource      Energy, LLC                |   | Delaware                                                    |   | Atlas      Energy Resources (in NY)                                                |   |
|                                     |   |                                                        |   |                                                                               |   |
| Resource      Well Services, LLC         |   | Delaware                                                    |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Viking      Resources, LLC               |   | Pennsylvania                                                |   | None                                                                               |   |
|                                     |   |                                                        |   |                                                                               |   |
| Westside      Pipeline Company, LLC      |   | Michigan                                                    |   | None                                                                               |   |

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