Name | Jurisdiction |
| Atlas America, LLC | Pennsylvania |
| AED Investments, Inc. | Delaware |
| Atlas America Mid-Continent, Inc. | Delaware |
| Atlas Resource Pennsylvania, Inc. | Delaware |
| Atlas Energy Management, Inc. | Delaware |
| Atlas Energy Resources, LLC | Delaware |
| Atlas Energy Operating Company, LLC | Delaware |
| Atlas Noble, LLC | Delaware |
| AER Pipeline Construction, Inc. | Delaware |
| Viking Resources, LLC | Pennsylvania |
| AIC, LLC | Delaware |
| Atlas Energy Ohio, LLC | Ohio |
| Atlas Resources, LLC | Pennsylvania |
| Anthem Securities, Inc. | Pennsylvania |
| Resource Energy, LLC | Delaware |
| Resource Well Services, LLC | Delaware |
| REI-NY, LLC | Delaware |
| Atlas Lightfoot, LLC | Delaware |
| Atlas Pipeline Holdings GP, LLC | Delaware |
| Atlas Pipeline Holdings, L.P. | Delaware |
| Atlas Pipeline Partners GP, LLC | Delaware |
| Atlas Pipeline Partners, L. P. | Delaware |
| Atlas Pipeline Operating Partnership, L.P. | Delaware |
| Atlas Pipeline New York, LLC | Pennsylvania |
| Atlas Pipeline Ohio, LLC | Pennsylvania |
| Atlas Pipeline Pennsylvania, LLC | Pennsylvania |
| Atlas Pipeline Mid-Continent LLC | Delaware |
| Elk City Oklahoma Pipeline, L.P. | Texas |
| Elk City Oklahoma GP, LLC | Delaware |
| Atlas Arkansas Pipeline LLC | Oklahoma |
| Atlas Pipeline Finance Corp. | Delaware |
| NOARK Pipeline System, L.P. | Arkansas |
| Mid-Continent Arkansas Pipeline, LLC | Arkansas |
| Ozark Gas Transmission, LLC | Oklahoma |
| Ozark Gas Gathering, LLC | Oklahoma |
| NOARK Energy Services, LLC | Oklahoma |
