On the Record · Ameren
Ameren subsidiaries, as it lists them
The subsidiaries Ameren lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| 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 |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Ameren’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-18. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.