Ameren Corporation 401(k) Review & Grade
Ameren Corporation Savings Investment Plan
ST. Louis, MOUtilities9,294 active participantsPlan year 2024✓ Auto-enroll
Estimate from the plan's Form 5500 filing · How we grade
$5,234Employer $ per active participant
$13,622Employee $ saved per active participant
0.11%Direct admin cost, % of plan assets
$3.2BNet plan assets, end of year
$277,553Average balance per account
Score breakdown
- Employer generosity18.9 / 5038th percentile for employer $ per participant
- Low cost13.2 / 2553th percentile for low admin cost vs. same-size plans
- Employee saving12.6 / 1584th percentile for employee $ per participant
- Plan features10 / 10Auto-enrollment, Default investment
Total score55 / 100 · Grade C
This plan vs. peers
Peers: Utilities plans with 2,500–9,999 active participants (38 plans).
| Measure | Percentile |
|---|---|
| Employer $ per participant | 38th |
| Lower admin cost | 53th |
| Employee saving | 84th |
| Peers that auto-enroll | 82% |
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Red flags from the filing
No red flags were reported on this filing's compliance questions.
What to do if you're in this plan
- Ameren put in about $5,234 per active participant, below the typical peer ($6,490). Any match is still an instant return, so contribute enough to get all of it.
- The filing shows total dollars, not the match formula. Ask HR for the Summary Plan Description so you know the exact match and vesting schedule.
- Fund expense ratios aren't in the filing. Look them up in your 404(a)(5) fee disclosure and favor low-cost index or target-date funds.
- The plan auto-enrolls employees. Check your default contribution rate. Defaults are often lower than what it takes to get the full match.
- Changing jobs? You can usually leave the money in the plan, move it to your new employer's plan, or roll it into an IRA. Don't cash out: you'd owe taxes and possibly a 10% penalty.
The raw numbers from the filing
| Employer contributions | $48,651,827 |
| Participant (employee) contributions | $126,612,133 |
| Other contributions (incl. rollovers in) | $8,980,111 |
| Administrative expenses paid from the plan | $3,509,125 |
| Investment advisory & management fees | $2,915,511 |
| Other admin expenses | $119,984 |
| Benefits paid out | $372,194,251 |
| Net assets, start / end of year | $3.0B / $3.2B |
| Active participants, start / end of year | 9,504 / 9,085 |
| Participants with account balances | 11,535 |
| Auto-enrollment (feature code 2S) | Yes |
| Auditor | Crowe LLP |
| Employer stock held by plan | $339,649,785 |
Largest service providers (Schedule C)
| Strategic Advisors, Inc. | $797,186 reported compensation |
| Fidelity Investments Institutional | $148,520 reported compensation |
| Qdro Consultants Co LLC | $5,700 reported compensation |
Source: DOL EFAST2 Form 5500 filing, acknowledgment ID 20250905104138NAL0028746192001, received 2025-09-05, EIN 43-1723446, plan #003, plan year 2024-01-01 to 2024-12-31. Verify at efast.dol.gov.