Mammoth Energy Partners LLC 401(k) Review & Grade
Mammoth Energy Partners 401(k) Profit Sharing Plan and Trust
Oklahoma City, OKUtilities720 active participantsPlan year 2024✓ Auto-enroll
Estimate from the plan's Form 5500 filing · How we grade
$2,800Employer $ per active participant
$4,592Employee $ saved per active participant
0.14%Direct admin cost, % of plan assets
$40.6MNet plan assets, end of year
$28,132Average balance per account
Score breakdown
- Employer generosity6.1 / 5012th percentile for employer $ per participant
- Low cost16.0 / 2564th percentile for low admin cost vs. same-size plans
- Employee saving0.8 / 155th percentile for employee $ per participant
- Plan features10 / 10Auto-enrollment, Default investment
Total score33 / 100 · Grade D
This plan vs. peers
Peers: Utilities plans with 500–2,499 active participants (75 plans).
| Measure | Percentile |
|---|---|
| Employer $ per participant | 12th |
| Lower admin cost | 64th |
| Employee saving | 5th |
| Peers that auto-enroll | 76% |
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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
- Mammoth Energy Partners put in about $2,800 per active participant, below the typical peer ($6,264). 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 | $2,017,142 |
| Participant (employee) contributions | $3,308,671 |
| Other contributions (incl. rollovers in) | $515,495 |
| Administrative expenses paid from the plan | $55,208 |
| Benefits paid out | $6,274,429 |
| Net assets, start / end of year | $35.8M / $40.6M |
| Active participants, start / end of year | 730 / 711 |
| Participants with account balances | 1,443 |
| Auto-enrollment (feature code 2S) | Yes |
| Auditor | Rose Rock Cpas, PLLC |
Largest service providers (Schedule C)
| Bok Financial Asset Management, Inc | $55,208 reported compensation |
| Charles Schwab Trust Bank | $15,798 reported compensation |
Source: DOL EFAST2 Form 5500 filing, acknowledgment ID 20251014142134NAL0001535107001, received 2025-10-14, EIN 47-1902732, plan #001, plan year 2024-01-01 to 2024-12-31. Verify at efast.dol.gov.