Employer · plans filed under one EIN
Ameren Corporation
St. Louis, MO · Utilities
Form 5500 information is as filed by the plan administrator with the Department of Labor and may be amended. Figures reflect the plan year shown, not current balances.
2 retirement plans with 100 or more participants file Form 5500 under Ameren Corporation's employer identification number (St. Louis, Missouri). Their latest filings total 34,963 participant records and $7.58B in net assets.
The largest is Ameren Retirement Plan, a cash balance pension plan with 23,302 participants. A person can be counted in more than one plan, so the participant total is a count of records rather than of people.
Employer contributions across the plans were $48.7M and participant contributions $127M in the latest plan years; benefits paid were $652M. Schedule C compensation reported to service provider organisations totalled $12.6M.
Combined net assets moved from $3.86B in 2009 to $7.58B in 2024 (up 96%). Plan mergers and spin-offs show up here as steps in the series.
Plans
| Plan | Kind | Plan year | Participants | Net assets | Per participant | Employer / active | Sch. C compensation |
|---|---|---|---|---|---|---|---|
| Ameren Retirement Plan | cash balance pension plan | 2024 | 23,302 | $4.38B | $188,079 | — | $11.6M |
| Ameren Corporation Savings Investment Plan | ESOP with a 401(k) feature | 2024 | 11,661 | $3.20B | $274,554 | $5,355 | $951K |
| US median, plan year 2024: DC plans $53,102 per participant, $2,175 employer contribution per active participant; DB plans $86,221 and $10,244. | |||||||
Trend by plan year
| Plan year | Plans | Participant records | Net assets | Employer contributions | Participant contributions |
|---|---|---|---|---|---|
| 2024 | 2 | 34,963 | $7.58B | $48.7M | $127M |
| 2023 | 2 | 38,840 | $7.43B | $55.0M | $135M |
| 2022 | 2 | 35,212 | $6.93B | $45.0M | $116M |
| 2021 | 2 | 34,948 | $9.29B | $98.7M | $111M |
| 2020 | 2 | 34,954 | $8.76B | $37.6M | $110M |
| 2019 | 1 | 23,124 | $4.79B | $49.0M | $0 |
| 2016 | 2 | 32,889 | $6.13B | $90.6M | $83.4M |
| 2015 | 2 | 32,879 | $5.79B | $191M | $81.7M |
| 2014 | 2 | 33,020 | $5.94B | $28.0M | $75.5M |
| 2013 | 2 | 33,670 | $5.59B | $138M | $77.7M |
| 2012 | 2 | 33,466 | $5.00B | $293M | $74.0M |
| 2011 | 2 | 33,414 | $4.42B | $71.2M | $74.1M |
| 2010 | 2 | 32,974 | $4.25B | $76.6M | $71.6M |
| 2009 | 2 | 34,576 | $3.86B | $150M | $69.5M |
History of the plans listed above, in the years each filed the full Form 5500 with 100 or more participants. Plans that have since terminated are not included.
Service providers
| Organisation | Services reported | Plans | Compensation reported |
|---|---|---|---|
| Willis Towers Watson | Actuarial; Consulting (pension) | 1 | $1,657,888 |
| Jennison Assoc Capital Corp. | Investment management | 1 | $1,275,429 |
| Pzena Investment Management | Investment management | 1 | $1,272,011 |
| Causeway Capital Management | Investment management | 1 | $1,192,632 |
| Nisa Investment Advisors | Investment management | 1 | $1,123,527 |
| Boston Partners | Investment management | 1 | $846,655 |
| Strategic Advisors, Inc. | Investment advisory (plan) | 1 | $797,186 |
| Legal and General | Investment management | 1 | $705,668 |
| The Bank of New York Mellon | Custodial (other than securities); Custodial (securities); Trustee (directed) | 1 | $696,069 |
| JP Morgan Investment Management | Investment advisory (plan); Investment management | 1 | $502,998 |
| Towers Watson Investment Services | Investment management | 1 | $476,225 |
| William Blair Investment Management | Investment management | 1 | $448,430 |
| Westfield Capital Management | Investment management | 1 | $446,954 |
| Fidelity Investments Institutional | Participant loan processing | 1 | $148,520 |
| Qdro Consultants Co. LLC | Consulting (general) | 1 | $5,700 |
Organisations paid $5,000 or more by any of these plans, from Schedule C. Individuals are not shown.
Questions and answers
How many retirement plans does Ameren Corporation have?
2 plans with 100 or more participants filed Form 5500 under its employer identification number for the latest plan years: Ameren Retirement Plan and Ameren Corporation Savings Investment Plan. Smaller plans and plans filed under a subsidiary's number are not grouped here.
How much does Ameren Corporation contribute to its plans?
$48,651,827 in employer contributions across these plans in their latest plan years, about $2,673 per active participant record. Form 5500 reports totals and not the match or accrual formula.
Who provides services to these plans?
Schedule C filings name Willis Towers Watson, Jennison Assoc Capital Corp., Pzena Investment Management and Causeway Capital Management and others. Only organisations paid $5,000 or more by a plan are listed on Schedule C.
Where does this come from?
Form 5500 annual reports filed with the Department of Labor's EFAST2 system, from the EBSA research files, with filings received through 24 Aug 2026. Figures are as filed and may be amended.
Provenance
Source: U.S. Department of Labor, Employee Benefits Security Administration, Form 5500 research files, public domain, with filings received through 24 Aug 2026. Plans are grouped by the sponsor's employer identification number exactly as filed; a company that files under several EINs appears as several employers. See the methodology and corrections.