Mirion Technologies, Inc. 401(k) Review & Grade
Mirion Technologies 401(k) Plan
Atlanta, GAManufacturing1,774 active participantsPlan year 2024✓ Auto-enroll
Estimate from the plan's Form 5500 filing · How we grade
$2,765Employer $ per active participant
$6,566Employee $ saved per active participant
0.14%Direct admin cost, % of plan assets
$201.3MNet plan assets, end of year
$107,820Average balance per account
Score breakdown
- Employer generosity29.6 / 5059th percentile for employer $ per participant
- Low cost16.3 / 2565th percentile for low admin cost vs. same-size plans
- Employee saving10.4 / 1569th percentile for employee $ per participant
- Plan features10 / 10Auto-enrollment, Default investment
- Red-flag deductions-13 pts2 issues reported on the filing
Total score53 / 100 · Grade C
This plan vs. peers
Peers: Manufacturing plans with 500–2,499 active participants (2,376 plans).
| Measure | Percentile |
|---|---|
| Employer $ per participant | 59th |
| Lower admin cost | 65th |
| Employee saving | 69th |
| Peers that auto-enroll | 59% |
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Red flags from the filing
Late deposits: the filing says some employee contributions were not sent to the plan on time ($401,779 reported). That's money taken from paychecks that sat with the employer longer than the law allows.
Corrective distributions: the plan refunded $19,213 in contributions, which usually means it failed annual nondiscrimination testing.
What to do if you're in this plan
- Mirion Technologies put in about $2,765 per active participant, more than the typical peer ($2,320). Contribute at least enough to collect the full match. Skipping it leaves part of your pay on the table.
- 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.
- The plan reported late deposits of employee contributions. Compare your pay stubs with your account statements, and contact the plan administrator if money shows up late.
- 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 | $4,904,110 |
| Participant (employee) contributions | $11,645,438 |
| Other contributions (incl. rollovers in) | $4,997,268 |
| Administrative expenses paid from the plan | $259,951 |
| Investment advisory & management fees | $50,331 |
| Benefits paid out | $15,211,099 |
| Net assets, start / end of year | $172.4M / $201.3M |
| Active participants, start / end of year | 2,218 / 1,329 |
| Participants with account balances | 1,867 |
| Auto-enrollment (feature code 2S) | Yes |
| Auditor | Windes, Inc. |
Largest service providers (Schedule C)
| Empower Annuity Insurance Company O | $209,620 reported compensation |
| Mercer (US) Inc Mercer Investments | $50,331 reported compensation |
Source: DOL EFAST2 Form 5500 filing, acknowledgment ID 20251015134536NAL0009540450001, received 2025-10-15, EIN 20-3979555, plan #001, plan year 2024-01-01 to 2024-12-31. Verify at efast.dol.gov.