401(k) · DOL Form 5500 · 2024

Century Aluminum Company 401(k) Plan

Data updated 2026-08-25

$150M
Total assets Near avg plan size
1,418
Participants Near avg headcount
93rd
Percentile by assets National rank
$105,581
Avg per participant Below avg balance/head
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Official DOL plan name: Century Aluminum 401(k) Plan · Sponsored by Century Aluminum Company · Illinois · Manufacturing

$150M in assets, 1,418 participants

Century Aluminum Company's Century Aluminum 401(k) Plan reported $150M in total assets and 1,418 participants in its 2024 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.

  • #15,886 in Manufacturing (17,777 peers)

Where Century Aluminum 401(k) Plan sits by assets

Century Aluminum 401(k) Plan sits in the top 10% of all filed plans by assets, $150M for 1,418 participants (~$105,581/participant), up 12.2% in 2024.

#15,886
in Manufacturing (17,777 peers)
+12.2%
assets growth YoY
1.5×
vs typical plan assets (national mean)

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 2024 · DOL Form 5500

$149,714,420 Top 7% higher than 93% of 123,620 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 2024

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

Plan-year 2024 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 (1,418 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Century Aluminum 401(k) Plan end-of-year assets rose from $133M in the plan year 2023 filing to $150M in the plan year 2024 filing.
  • Century Aluminum 401(k) Plan reported net income fell from $18M in the plan year 2023 filing to $16M in the plan year 2024 filing.

See the national 2023→2024 release diff →

DOL schedule card

Filing strip 133070826 · Century Aluminum Company PY 2024 · 401(k)

Century Aluminum 401(k) Plan · $150M · 1,418 · 93rd

  • IND $150M
  • IND 1,418
  • IND 93rd
  • IND 401(k)
  • IND near Countrymark Savings Plan
  • IND ind #15886

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

Century Aluminum 401(k) Plan$150MCountrymark Savings Plan$150MEwing Irrigation Products, Inc. Profit Sharing PlanEwing Irrigation Products, I…$150MMmm Partner/Staff 401(k) Profit Sharing PlanMmm Partner/Staff 401(k) Pro…$150MSchnucks Pay Deferral Plan$150M
End-of-year total assets ($M) among Century Aluminum 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Scale-class filing particulars (2024)

Total Assets (Beginning of Year)$133M
Net Assets (End of Year)$150M
Net Income$16M
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 -50510152025 Total assets ($B) Participants Century Aluminum 401(k) Plan, Total assets ($B): 0.14971442 · Participants: 1418Century Aluminum 401(k) PlanAccenture United States 401(k) Match and Savings Plan, Total assets ($B): 21.302643276 · Participants: 66965Accenture United States 401(k) Match and Savings PlanState Farm 401(k) Savings Plan, Total assets ($B): 19.010099056 · Participants: 63297State Farm 401(k) Savings PlanUnited Airlines Pilot Retirement Account Plan, Total assets ($B): 16.835964452 · Participants: 16659United Airlines Pilot Retirement Account PlanAbbott Laboratories Stock Retirement Plan, Total assets ($B): 15.755668 · Participants: 38229Abbott Laboratories Stock Retirement PlanWalgreens Retirement Savings Plan, Total assets ($B): 14.535873337 · Participants: 233635Walgreens 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 Countrymark Savings Plan in IN ($150M); by covered participants it is Buehler's Fresh Foods Employees' 401(k) Plan in OH (1,418 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($150M here).

Similar participant headcount

Nearest other-state filings by covered participants (1,418 participants); asset peers above are excluded.

DOL Form 5500 plan year 2024. 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 2024? ▼
Century Aluminum 401(k) Plan grew at a solid clip - up 12.2% during 2024, from $133M to $150M. Reported net income was $16M.
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 123,622 plans that reported assets for plan year 2024 (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 Countrymark Savings Plan in IN ($150M, 495 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 Buehler's Fresh Foods Employees' 401(k) Plan in OH (1,418 participants, $39M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2024.

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.