| | | | | | | | |
| Name | | State or Jurisdiction of Organization |
| | |
| Ameren Corporation | | Missouri |
| Ameren Development Company | | Missouri |
| Missouri Central Railroad Company | | Delaware |
| QST Enterprises Inc. | | Illinois |
| Ameren EIP Investment, LLC | | Delaware |
| Ameren Accelerator Investments, LLC | | Delaware |
| AmerenEnergy Medina Valley Cogen, L.L.C. | | Illinois |
| Ameren Transmission Company, LLC | | Delaware |
| ATX East, LLC | | Delaware |
| ATX Southwest, LLC | | Delaware |
| ATX-TIP Holdings, Inc. | | Ontario |
| Transmission Infrastructure Partnerships Ltd (50% interest) | | Ontario |
| Lucky Corridor, LLC | | Colorado |
| Ameren Transmission Company of Illinois | | Illinois |
| Ameren Services Company | | Missouri |
| Ameren Illinois Company (d/b/a Ameren Illinois) | | Illinois |
| Union Electric Company (d/b/a Ameren Missouri) | | Missouri |
| Ameren Missouri Securitization Funding I, LLC | | Delaware |
| STARS Alliance, LLC (25% interest) | | Delaware |