Ameren
Ameren Corporation (NYSE: AEE) operates as a public utility holding company headquartered in St. Louis, Missouri, with its primary business conducted through three principal subsidiaries: Ameren Missouri, Ameren Illinois, and Ameren Transmission Company of Illinois (ATXI). The company's website is www.ameren.com. From the company’s description.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What Ameren does
In the company’s own words
Ameren Corporation (NYSE: AEE) operates as a public utility holding company headquartered in St. Louis, Missouri, with its primary business conducted through three principal subsidiaries: Ameren Missouri, Ameren Illinois, and Ameren Transmission Company of Illinois (ATXI). The company's website is www.ameren.com.
Ameren Missouri operates rate-regulated electric generation, transmission, and distribution businesses alongside a natural gas distribution business throughout Missouri. Ameren Illinois operates rate-regulated electric transmission, electric distribution, and natural gas distribution businesses in Illinois. ATXI operates a Federal Energy Regulatory Commission-regulated electric transmission business within the Midcontinent Independent System Operator footprint.
The company organizes its operations into four reportable segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. As of 2025, Ameren Missouri represented approximately 52 percent of operating revenues, Ameren Illinois Electric Distribution represented 26 percent, Ameren Illinois Natural Gas represented 1 percent, and Ameren Transmission represented approximately 8 percent, with the remainder from other operations.
Ameren serves millions of customers across its service territories in Missouri and Illinois through an integrated transmission system composed of assets from all three operating subsidiaries. The company operates two MISO balancing authority areas with combined peak demand of approximately 15,500 megawatts. Ameren Missouri's generation portfolio includes nuclear, coal, natural gas, hydroelectric, and renewable energy sources, including wind and solar facilities.
The company's business model centers on rate-regulated utility operations, with revenues determined through regulatory proceedings before the Missouri Public Service Commission, Illinois Commerce Commission, and FERC. Ameren's competitive advantages include its integrated transmission infrastructure, diversified generation portfolio, established regulatory relationships, and participation in organized wholesale markets. The company has invested substantially in grid modernization, renewable energy integration, and customer energy-efficiency programs to support long-term sustainability and regulatory compliance across its service territories.
Company details
- Sector
- Utilities
- Industry (SIC)
- Electric, Gas & Water
- Headquarters
- ST LOUIS, MO
- Fiscal year end
- December
- CIK
- 1002910
- SIC
- 4931
Financial performance, year by year
Fiscal 2013–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns Ameren — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Largest fund holders · Ameren’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Ameren’s bonds, as funds hold them
Funds report holding 42 issues of Ameren’s debt, $2.79B at market value — what funds hold, not the company’s total debt. Weighted-average coupon 4.49%, maturing 2026 to 2056.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
Put this business in context.
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