401(k) · DOL Form 5500 · 2022

Century Aluminum Company 401(k) Plan

Data updated 2026-08-25

$116M
Total assets Near avg plan size
1,979
Participants Near avg headcount
93rd
Percentile by assets National rank
$58,508
Avg per participant Low balance/head
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Official DOL plan name: Century Aluminum 401(k) Plan · Sponsored by Century Aluminum Company · Illinois · Manufacturing

$116M in assets, 1,979 participants

Century Aluminum Company's Century Aluminum 401(k) Plan reported $116M in total assets and 1,979 participants in its 2022 DOL Form 5500 filing, ranking in the 93rd 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.

  • #18,537 in Manufacturing (20,602 peers)

Coverage in Illinois

Century Aluminum 401(k) Plan covers 1,979 participants in Illinois, 2.5x the typical Illinois plan (state average ~779 per filing). Assets: $116M.

#18,537
in Manufacturing (20,602 peers)
-19.5%
assets change YoY
1.2×
vs typical plan assets (national mean)

The plan reported a net loss of $28M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

Century Aluminum 401(k) Plan's outsized position by total assets

Century Aluminum 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2022 · DOL Form 5500

$115,787,255 Top 7% higher than 93% of 139,123 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 2022

Century Aluminum 401(k) Plan's large-plan peer group by participant headcount

Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Century Aluminum 401(k) Plan lands in the large band (1,979 participants).

DOL schedule card

Filing strip 133070826 · Century Aluminum Company PY 2022 · 401(k)

Century Aluminum 401(k) Plan · $116M · 1,979 · 93rd

  • PCT $116M
  • PCT 1,979
  • PCT 93rd
  • PCT 401(k)
  • PCT near Amesbury Group, Inc. Retirement Savings Plan
  • PCT ind #18537

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 Manufacturing retirement plans → · Plans in Illinois →

Century Aluminum 401(k) Plan in the asset neighbourhood

Foulston Siefkin Savings Plan$116MJohnson Controls Federal Systems, Inc. Retirement Savings PlanJohnson Controls Federal Sys…$116MAjinomoto Foods North America, Inc. 401(k) Savings PlanAjinomoto Foods North Americ…$116MCentury Aluminum 401(k) Plan$116MAmesbury Group, Inc. Retirement Savings PlanAmesbury Group, Inc. Retirem…$116M
End-of-year total assets ($M) among Century Aluminum 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2022.

Illinois filing particulars

Total Assets (Beginning of Year)$144M
Net Assets (End of Year)$116M
Net Income-$28M
Employer EIN133070826
Plan Effective Date1989-06-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Century Aluminum Company)

Sponsor-wide plan assets over time

All Century Aluminum Company plans reported in each filing year

Latest sponsor-wide plan assets
$305M 11.384756334413273% vs 2022
2024 filing year
$270M$280M$290M$300M$310M 202220232024 $274M $305M ▲ +11.4%
Year Plans Participants Total Assets
2022 2 2,495 $274M
2023 2 1,900 $295M
2024 2 1,883 $305M

Nearby 401(k) Plans in Illinois

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

Century Aluminum 401(k) Plan vs. nearby 401(k) plans in Illinois, assets vs. participants Scatter plot of 6 data points. -1000000100000200000300000 -505101520 Total assets ($B) Participants Century Aluminum 401(k) Plan, Total assets ($B): 0.115787255 · Participants: 1979Century Aluminum 401(k) PlanState Farm 401(k) Savings Plan, Total assets ($B): 14.651519685 · Participants: 53616State Farm 401(k) Savings PlanAccenture United States 401(k) Match and Savings Plan, Total assets ($B): 14.283954811 · Participants: 66653Accenture United States 401(k) Match and Savings PlanAbbott Laboratories Stock Retirement Plan, Total assets ($B): 13.333286 · Participants: 36136Abbott Laboratories Stock Retirement PlanUnited Airlines Pilot Retirement Account Plan, Total assets ($B): 11.816542826 · Participants: 13437United Airlines Pilot Retirement Account PlanWalgreens Retirement Savings Plan, Total assets ($B): 11.682551768 · Participants: 238072Walgreens Retirement Savings Plan
Century Aluminum 401(k) Plan vs. nearby 401(k) plans in Illinois, assets vs. participants
Compare Century Aluminum 401(k) Plan side-by-side with 3 peers →

Century Aluminum 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Illinois, the nearest 401(k) by assets is Amesbury Group, Inc. Retirement Savings Plan in SD ($116M); by covered participants it is Molson Coors Consolidated Retirement and Thrift Savings Plan in WI (1,980 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (1,979 participants); asset peers above are excluded.

DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Century Aluminum 401(k) Plan assets move in 2022? ▼
Century Aluminum 401(k) Plan declined sharply - down 19.5% during 2022, from $144M to $116M. Reported net income was -$28M.
How have Century Aluminum Company plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Century Aluminum Company's sponsor-wide assets grew 11.4%, from $274M to $305M.
Where does Century Aluminum 401(k) Plan rank by assets among Form 5500 filers? ▼
Century Aluminum 401(k) Plan ranks in the 93rd percentile by end-of-year assets among 139,126 plans that reported assets for plan year 2022 (in the top 10% of all filed plans by assets).
Which 401(k) plans are similar in size to Century Aluminum 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Amesbury Group, Inc. Retirement Savings Plan in SD ($116M, 1,284 participants).
Which 401(k) plans cover a similar participant headcount to Century Aluminum 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Molson Coors Consolidated Retirement and Thrift Savings Plan in WI (1,980 participants, $383M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2022.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 133070826.

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.