401(k) · DOL Form 5500 · 2023

Mp Materials Corp. 401(k) Plan

Data updated 2026-08-25

$14M
Total assets Small plan by assets
485
Participants Below avg headcount
65th
Percentile by assets National rank
$28,327
Avg per participant Low balance/head
PlainRetire home → About this data RSS: change history

Official DOL plan name: Mp Materials Corp. 401(k) Plan · Sponsored by Mp Materials Corp. · Nevada · Mining & Oil Extraction

$14M in assets, 485 participants

Mp Materials Corp.'s Mp Materials Corp. 401(k) Plan reported $14M in total assets and 485 participants in its 2023 DOL Form 5500 filing, ranking in the 65th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

  • #368 in Mining & Oil Extraction (811 peers)

Mining & Oil Extraction sector rank

Within Mining & Oil Extraction, Mp Materials Corp. 401(k) Plan ranks #368 of 811 2023 filers by assets (895% of the sector average)-$14M for 485 participants.

#368
in Mining & Oil Extraction (811 peers)
+97.1%
assets growth YoY

Mp Materials Corp. 401(k) Plan's mid-pack asset rank among Mining & Oil Extraction and all filers

Mp Materials Corp. 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$13,738,480 Top 35% higher than 65% of 127,068 filed plans

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023

Mp Materials Corp. 401(k) Plan among mid-size filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Mp Materials Corp. 401(k) Plan sits mid-pack in the medium band (485 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Mp Materials Corp. 401(k) Plan reported net income rose from $1M in the plan year 2022 filing to $7M in the plan year 2023 filing.
  • Mp Materials Corp. 401(k) Plan end-of-year assets rose from $7M in the plan year 2022 filing to $14M in the plan year 2023 filing.
  • Mp Materials Corp. 401(k) Plan reported participants rose from 340 in the plan year 2022 filing to 485 in the plan year 2023 filing.

See the national 2022→2023 release diff →

Form 5500 schedule snapshot

Filing strip 844465489 · Mp Materials Corp. PY 2023 · 401(k)

Mp Materials Corp. 401(k) Plan · $14M · 485 · 65th

  • IND $14M
  • IND 485
  • IND 65th
  • IND 401(k)
  • IND near Nausch, Hogan, & Murray, Inc. 401(k) Savings Plan
  • IND ind #368

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Mining & Oil Extraction retirement plans → · Plans in Nevada →

Mp Materials Corp. 401(k) Plan in the asset neighbourhood

Mp Materials Corp. 401(k) PlanMp Materials Corp. 401(k) Pl…$14MNausch, Hogan, & Murray, Inc. 401(k) Savings PlanNausch, Hogan, & Murray, Inc…$14MThe Sterno Group Companies, LLC 401(k) Profit Sharing and TrustThe Sterno Group Companies, …$14MIfa Rotorion North America, LLC 401(k) PlanIfa Rotorion North America, …$14MEasterseals of Southeastern Pennsylvania Defined Contribution & 401(k) PlanEasterseals of Southeastern …$14M
End-of-year total assets ($M) among Mp Materials Corp. 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Mining & Oil Extraction filing particulars

Total Assets (Beginning of Year)$7M
Net Assets (End of Year)$14M
Net Income$7M
Employer EIN844465489
Plan Effective Date2018-05-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Mp Materials Corp.)

Sponsor-wide plan assets over time

All Mp Materials Corp. plans reported in each filing year

Latest sponsor-wide plan assets
$23M 234.39605723788293% vs 2022
2024 filing year
$5M$10M$15M$20M$25M 202220232024 $6.97M $23.3M ▲ +234.4%
Year Plans Participants Total Assets
2022 1 340 $7M
2023 1 485 $14M
2024 1 683 $23M

Nearby 401(k) Plans in Nevada

Peer 401(k) plans, same state, same plan type, ranked by total assets.

Mp Materials Corp. 401(k) Plan vs. nearby 401(k) plans in Nevada, assets vs. participants Scatter plot of 6 data points. -10000010000200003000040000 -0.500.511.522.5 Total assets ($B) Participants Mp Materials Corp. 401(k) Plan, Total assets ($B): 0.01373848 · Participants: 485Mp Materials Corp. 401(k) PlanThe Mgm Resorts 401(k) Savings Plan, Total assets ($B): 2.01117919 · Participants: 28142The Mgm Resorts 401(k) Savings PlanCaesars Entertainment, Inc 401(k) Plan, Total assets ($B): 1.82487518 · Participants: 29628Caesars Entertainment, Inc 401(k) PlanBarrick Retirement Plan, Total assets ($B): 1.19282548 · Participants: 6964Barrick Retirement PlanNv Energy 401(k) Plan, Total assets ($B): 0.999258908 · Participants: 2475Nv Energy 401(k) PlanEighth District Electrical Pension Fund Annuity Plan, Total assets ($B): 0.98131609 · Participants: 20426Eighth District Electrical Pension Fund Annuity Plan
Mp Materials Corp. 401(k) Plan vs. nearby 401(k) plans in Nevada, assets vs. participants
Compare Mp Materials Corp. 401(k) Plan side-by-side with 3 peers →

Mp Materials Corp. 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Nevada, the nearest 401(k) by assets is Nausch, Hogan, & Murray, Inc. 401(k) Savings Plan in NY ($14M); by covered participants it is Celia Corporation 401(k) Plan in MI (485 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (485 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Mp Materials Corp. 401(k) Plan assets move in 2023? ▼
Mp Materials Corp. 401(k) Plan surged - up 97.1% during 2023, from $7M to $14M. Reported net income was $7M.
How have Mp Materials Corp. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Mp Materials Corp.'s sponsor-wide assets grew 234.4%, from $7M to $23M.
Which 401(k) plans are similar in size to Mp Materials Corp. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Nausch, Hogan, & Murray, Inc. 401(k) Savings Plan in NY ($14M, 18 participants).
Which 401(k) plans cover a similar participant headcount to Mp Materials Corp. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Celia Corporation 401(k) Plan in MI (485 participants, $30M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 844465489.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.