AMEREN CORP
Ticker: AEEUtilitiesElectric, Gas & WaterS&P 500The business
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.
- Sector
- Utilities
- Industry
- Electric, Gas & Water
- HQ
- ST LOUIS, MO
- FY end
- 12-31
- CIK
- 1002910
- SIC
- 4931
Ownership
Who holds AMEREN CORP — across funds, superinvestors and bonds · N-PORT 2026Q2 · 13F 2026-06-30
Top fund holders
| Fund | % of fund | Value |
|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND VTI · VANGUARD INDEX FUNDS | 0.04% | $993.13M |
| VANGUARD 500 INDEX FUND VOO · VANGUARD INDEX FUNDS | 0.05% | $810.70M |
| T. Rowe Price Capital Appreciation Fund PRWCX · T. ROWE PRICE CAPITAL APPRECIATION FUND, INC. | 1.15% | $809.47M |
| VANGUARD MID-CAP INDEX FUND VO · VANGUARD INDEX FUNDS | 0.30% | $677.76M |
| State Street(R) Utilities Select Sector SPDR(R) ETF XLU · SELECT SECTOR SPDR TRUST | 2.20% | $509.06M |
Bonds held by funds
Funds report holding 42 issues of AMEREN CORP's debt, $2.79B at fund-held market value — what funds hold, not the company's debt outstanding. Weighted-average coupon 4.49%, maturing 2026–2056.
| Issue | Coupon | Matures | Funds | Fund-held |
|---|---|---|---|---|
| AMEREN CORP | 5.375% | 2035-03-15 | 57 | $251.92M |
| Ameren Corp | 5.000% | 2029-01-15 | 82 | $247.96M |
| AEE 3.5 01/15/31 | 3.500% | 2031-01-15 | 61 | $175.51M |
| Ameren Illinois Co. | 4.950% | 2033-06-01 | 59 | $157.03M |
| UNION ELECTRIC | 4.800% | 2036-03-15 | 63 | $145.59M |
| Union Electric Co | 5.200% | 2034-04-01 | 64 | $123.20M |
| Ameren Corp | 5.000% | 2036-05-15 | 55 | $122.30M |
| AEE 5.7 12/01/26 | 5.700% | 2026-12-01 | 41 | $120.14M |
| UNION ELECTRIC CO SR SEC 1ST LIEN 5.25% 04-15-35 | 5.250% | 2035-04-15 | 48 | $113.06M |
| AEE 3.85 09/01/32 | 3.850% | 2032-09-01 | 36 | $89.77M |
The 10 largest by fund-held value, of 42.
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”.
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