401k Plan data: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN plan

CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 401k Plan overview

Plan Name	CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN
Plan identification number	005

CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN Benefits

401k Plan Type	Defined Benefit Pension
Plan Features/Benefits	Benefits are primarily pay related Benefits are primarily flat dollar (includes dollars per year of service) Plan sponsor(s) is (are) a member(s) of a controlled group (Code sections 414(b), (c), or (m)).

401k Sponsoring company profile

CENTURY ALUMINUM COMPANY has sponsored the creation of one or more 401k plans.

Company Name: CENTURY ALUMINUM COMPANY

Employer identification number (EIN): 133070826

NAIC Classification: 331310

Additional information about CENTURY ALUMINUM COMPANY

Jurisdiction of Incorporation: State of Delaware Division of Corporations

Incorporation Date:

Company Identification Number: 0908570

More information about CENTURY ALUMINUM COMPANY

Form 5500 Filing Information

Submission information for form 5500 for 401k plan CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
005 2022-01-01
005 2021-01-01
005 2020-01-01
005 2019-01-01
005 2018-01-01
005 2017-01-01 KYLE SHERLOCK

Plan Statistics for CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN

401k plan membership statisitcs for CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN

Measure Date Value
2022: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2022 401k membership
Market value of plan assets 2022-12-31 234,429,930
Acturial value of plan assets 2022-12-31 222,373,901
Funding target for retired participants and beneficiaries receiving payment 2022-12-31 121,132,370
Number of terminated vested participants 2022-12-31 428
Fundng target for terminated vested participants 2022-12-31 24,102,065
Active participant vested funding target 2022-12-31 25,962,272
Number of active participants 2022-12-31 515
Total funding liabilities for active participants 2022-12-31 27,787,927
Total participant count 2022-12-31 1,898
Total funding target for all participants 2022-12-31 173,022,362
Balance at beginning of prior year after applicable adjustments 2022-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2022-12-31 0
Amount remaining of carryover balance 2022-12-31 0
Amount remaining of prefunding balance 2022-12-31 0
Present value of excess contributions 2022-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2022-12-31 0
Reductions in caryover balances due to elections or deemed elections 2022-12-31 0
Reductions in prefunding balances due to elections or deemed elections 2022-12-31 0
Balance of carryovers at beginning of current year 2022-12-31 0
Balance of prefunding at beginning of current year 2022-12-31 0
Total employer contributions 2022-12-31 6,922,623
Total employee contributions 2022-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2022-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2022-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2022-12-31 6,421,195
Unpaid minimum required contributions for all prior years 2022-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2022-12-31 0
Remaining amount of unpaid minimum required contributions 2022-12-31 0
Minimum required contributions for current year target normal cost 2022-12-31 2,445,899
Net shortfall amortization installment of oustanding balance 2022-12-31 0
Waiver amortization installment 2022-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2022-12-31 0
Additional cash requirement 2022-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2022-12-31 6,421,195
Unpaid minimum required contributions for current year 2022-12-31 0
Unpaid minimum required contributions for all years 2022-12-31 0
Total participants, beginning-of-year 2022-01-01 1,895
Total number of active participants reported on line 7a of the Form 5500 2022-01-01 477
Number of retired or separated participants receiving benefits 2022-01-01 772
Number of other retired or separated participants entitled to future benefits 2022-01-01 417
Total of all active and inactive participants 2022-01-01 1,666
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2022-01-01 185
Total participants 2022-01-01 1,851
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2022-01-01 87
2021: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2021 401k membership
Market value of plan assets 2021-12-31 227,537,677
Acturial value of plan assets 2021-12-31 205,747,895
Funding target for retired participants and beneficiaries receiving payment 2021-12-31 117,289,777
Number of terminated vested participants 2021-12-31 437
Fundng target for terminated vested participants 2021-12-31 23,147,326
Active participant vested funding target 2021-12-31 29,161,400
Number of active participants 2021-12-31 353
Total funding liabilities for active participants 2021-12-31 30,797,615
Total participant count 2021-12-31 1,741
Total funding target for all participants 2021-12-31 171,234,718
Balance at beginning of prior year after applicable adjustments 2021-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2021-12-31 0
Amount remaining of carryover balance 2021-12-31 0
Amount remaining of prefunding balance 2021-12-31 0
Present value of excess contributions 2021-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2021-12-31 0
Reductions in caryover balances due to elections or deemed elections 2021-12-31 0
Reductions in prefunding balances due to elections or deemed elections 2021-12-31 0
Balance of carryovers at beginning of current year 2021-12-31 0
Balance of prefunding at beginning of current year 2021-12-31 0
Total employer contributions 2021-12-31 0
Total employee contributions 2021-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2021-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2021-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2021-12-31 0
Unpaid minimum required contributions for all prior years 2021-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2021-12-31 0
Remaining amount of unpaid minimum required contributions 2021-12-31 0
Minimum required contributions for current year target normal cost 2021-12-31 2,808,129
Net shortfall amortization installment of oustanding balance 2021-12-31 0
Waiver amortization installment 2021-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2021-12-31 0
Additional cash requirement 2021-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2021-12-31 0
Unpaid minimum required contributions for current year 2021-12-31 0
Unpaid minimum required contributions for all years 2021-12-31 0
Total participants, beginning-of-year 2021-01-01 1,729
Total number of active participants reported on line 7a of the Form 5500 2021-01-01 516
Number of retired or separated participants receiving benefits 2021-01-01 782
Number of other retired or separated participants entitled to future benefits 2021-01-01 417
Total of all active and inactive participants 2021-01-01 1,715
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2021-01-01 180
Total participants 2021-01-01 1,895
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2021-01-01 10
2020: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2020 401k membership
Market value of plan assets 2020-12-31 210,863,274
Acturial value of plan assets 2020-12-31 201,360,376
Funding target for retired participants and beneficiaries receiving payment 2020-12-31 122,148,573
Number of terminated vested participants 2020-12-31 434
Fundng target for terminated vested participants 2020-12-31 23,196,472
Active participant vested funding target 2020-12-31 31,199,698
Number of active participants 2020-12-31 393
Total funding liabilities for active participants 2020-12-31 33,096,544
Total participant count 2020-12-31 1,786
Total funding target for all participants 2020-12-31 178,441,589
Balance at beginning of prior year after applicable adjustments 2020-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2020-12-31 0
Amount remaining of carryover balance 2020-12-31 0
Amount remaining of prefunding balance 2020-12-31 0
Present value of excess contributions 2020-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2020-12-31 0
Reductions in caryover balances due to elections or deemed elections 2020-12-31 0
Reductions in prefunding balances due to elections or deemed elections 2020-12-31 0
Balance of carryovers at beginning of current year 2020-12-31 0
Balance of prefunding at beginning of current year 2020-12-31 0
Total employer contributions 2020-12-31 0
Total employee contributions 2020-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2020-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2020-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2020-12-31 0
Unpaid minimum required contributions for all prior years 2020-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2020-12-31 0
Remaining amount of unpaid minimum required contributions 2020-12-31 0
Minimum required contributions for current year target normal cost 2020-12-31 2,810,104
Net shortfall amortization installment of oustanding balance 2020-12-31 0
Waiver amortization installment 2020-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2020-12-31 0
Additional cash requirement 2020-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2020-12-31 0
Unpaid minimum required contributions for current year 2020-12-31 0
Unpaid minimum required contributions for all years 2020-12-31 0
Total participants, beginning-of-year 2020-01-01 1,775
Total number of active participants reported on line 7a of the Form 5500 2020-01-01 353
Number of retired or separated participants receiving benefits 2020-01-01 781
Number of other retired or separated participants entitled to future benefits 2020-01-01 427
Total of all active and inactive participants 2020-01-01 1,561
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2020-01-01 168
Total participants 2020-01-01 1,729
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2020-01-01 22
2019: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2019 401k membership
Market value of plan assets 2019-12-31 186,238,737
Acturial value of plan assets 2019-12-31 197,143,519
Funding target for retired participants and beneficiaries receiving payment 2019-12-31 120,401,320
Number of terminated vested participants 2019-12-31 438
Fundng target for terminated vested participants 2019-12-31 22,849,689
Active participant vested funding target 2019-12-31 31,826,035
Number of active participants 2019-12-31 405
Total funding liabilities for active participants 2019-12-31 33,643,469
Total participant count 2019-12-31 1,793
Total funding target for all participants 2019-12-31 176,894,478
Balance at beginning of prior year after applicable adjustments 2019-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2019-12-31 0
Carryover balanced portion elected for use to offset prior years funding requirement 2019-12-31 0
Prefunding balanced used to offset prior years funding requirement 2019-12-31 0
Amount remaining of carryover balance 2019-12-31 0
Amount remaining of prefunding balance 2019-12-31 0
Present value of excess contributions 2019-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2019-12-31 0
Reductions in caryover balances due to elections or deemed elections 2019-12-31 0
Reductions in prefunding balances due to elections or deemed elections 2019-12-31 0
Balance of carryovers at beginning of current year 2019-12-31 0
Balance of prefunding at beginning of current year 2019-12-31 0
Total employer contributions 2019-12-31 0
Total employee contributions 2019-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2019-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2019-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2019-12-31 0
Unpaid minimum required contributions for all prior years 2019-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2019-12-31 0
Remaining amount of unpaid minimum required contributions 2019-12-31 0
Minimum required contributions for current year target normal cost 2019-12-31 3,140,986
Net shortfall amortization installment of oustanding balance 2019-12-31 0
Waiver amortization installment 2019-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2019-12-31 0
Additional cash requirement 2019-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2019-12-31 0
Unpaid minimum required contributions for current year 2019-12-31 0
Unpaid minimum required contributions for all years 2019-12-31 0
Total participants, beginning-of-year 2019-01-01 1,783
Total number of active participants reported on line 7a of the Form 5500 2019-01-01 393
Number of retired or separated participants receiving benefits 2019-01-01 794
Number of other retired or separated participants entitled to future benefits 2019-01-01 425
Total of all active and inactive participants 2019-01-01 1,612
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2019-01-01 163
Total participants 2019-01-01 1,775
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2019-01-01 14
2018: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2018 401k membership
Market value of plan assets 2018-12-31 216,343,687
Acturial value of plan assets 2018-12-31 200,067,223
Funding target for retired participants and beneficiaries receiving payment 2018-12-31 110,602,212
Number of terminated vested participants 2018-12-31 449
Fundng target for terminated vested participants 2018-12-31 24,095,384
Active participant vested funding target 2018-12-31 33,317,048
Number of active participants 2018-12-31 391
Total funding liabilities for active participants 2018-12-31 35,385,249
Total participant count 2018-12-31 1,772
Total funding target for all participants 2018-12-31 170,082,845
Balance at beginning of prior year after applicable adjustments 2018-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2018-12-31 0
Carryover balanced portion elected for use to offset prior years funding requirement 2018-12-31 0
Prefunding balanced used to offset prior years funding requirement 2018-12-31 0
Amount remaining of carryover balance 2018-12-31 0
Amount remaining of prefunding balance 2018-12-31 0
Present value of excess contributions 2018-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2018-12-31 0
Balance of carryovers at beginning of current year 2018-12-31 0
Balance of prefunding at beginning of current year 2018-12-31 0
Total employer contributions 2018-12-31 0
Total employee contributions 2018-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2018-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2018-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2018-12-31 0
Unpaid minimum required contributions for all prior years 2018-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2018-12-31 0
Remaining amount of unpaid minimum required contributions 2018-12-31 0
Minimum required contributions for current year target normal cost 2018-12-31 2,683,140
Net shortfall amortization installment of oustanding balance 2018-12-31 0
Waiver amortization installment 2018-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2018-12-31 0
Carryover balance elected to use to offset funding requirement 2018-12-31 0
Prefunding balance elected to use to offset funding requirement 2018-12-31 0
Additional cash requirement 2018-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2018-12-31 0
Unpaid minimum required contributions for current year 2018-12-31 0
Unpaid minimum required contributions for all years 2018-12-31 0
Total participants, beginning-of-year 2018-01-01 1,764
Total number of active participants reported on line 7a of the Form 5500 2018-01-01 405
Number of retired or separated participants receiving benefits 2018-01-01 799
Number of other retired or separated participants entitled to future benefits 2018-01-01 428
Total of all active and inactive participants 2018-01-01 1,632
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2018-01-01 151
Total participants 2018-01-01 1,783
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2018-01-01 0
2017: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2017 401k membership
Market value of plan assets 2017-12-31 46,630,288
Acturial value of plan assets 2017-12-31 47,600,938
Funding target for retired participants and beneficiaries receiving payment 2017-12-31 39,071,058
Number of terminated vested participants 2017-12-31 167
Fundng target for terminated vested participants 2017-12-31 6,149,862
Active participant vested funding target 2017-12-31 624,382
Number of active participants 2017-12-31 3
Total funding liabilities for active participants 2017-12-31 624,382
Total participant count 2017-12-31 593
Total funding target for all participants 2017-12-31 45,845,302
Balance at beginning of prior year after applicable adjustments 2017-12-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2017-12-31 0
Carryover balanced portion elected for use to offset prior years funding requirement 2017-12-31 0
Prefunding balanced used to offset prior years funding requirement 2017-12-31 0
Amount remaining of carryover balance 2017-12-31 0
Amount remaining of prefunding balance 2017-12-31 0
Present value of excess contributions 2017-12-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2017-12-31 0
Balance of carryovers at beginning of current year 2017-12-31 0
Balance of prefunding at beginning of current year 2017-12-31 0
Total employer contributions 2017-12-31 0
Total employee contributions 2017-12-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2017-12-31 0
Contributions made to avoid restrictions adjusted to valuation date 2017-12-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2017-12-31 0
Unpaid minimum required contributions for all prior years 2017-12-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2017-12-31 0
Remaining amount of unpaid minimum required contributions 2017-12-31 0
Minimum required contributions for current year target normal cost 2017-12-31 520,000
Net shortfall amortization installment of oustanding balance 2017-12-31 0
Waiver amortization installment 2017-12-31 0
Total funding amount beforereflecting carryover/prefunding balances 2017-12-31 0
Carryover balance elected to use to offset funding requirement 2017-12-31 0
Prefunding balance elected to use to offset funding requirement 2017-12-31 0
Additional cash requirement 2017-12-31 0
Contributions allocatedtoward minimum required contributions for current year 2017-12-31 0
Unpaid minimum required contributions for current year 2017-12-31 0
Unpaid minimum required contributions for all years 2017-12-31 0
Total participants, beginning-of-year 2017-01-01 593
Total number of active participants reported on line 7a of the Form 5500 2017-01-01 391
Number of retired or separated participants receiving benefits 2017-01-01 786
Number of other retired or separated participants entitled to future benefits 2017-01-01 444
Total of all active and inactive participants 2017-01-01 1,621
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2017-01-01 143
Total participants 2017-01-01 1,764
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2017-01-01 0

Measure	Date	Value
2022: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2022 401k membership
Market value of plan assets	2022-12-31	234,429,930
Acturial value of plan assets	2022-12-31	222,373,901
Funding target for retired participants and beneficiaries receiving payment	2022-12-31	121,132,370
Number of terminated vested participants	2022-12-31	428
Fundng target for terminated vested participants	2022-12-31	24,102,065
Active participant vested funding target	2022-12-31	25,962,272
Number of active participants	2022-12-31	515
Total funding liabilities for active participants	2022-12-31	27,787,927
Total participant count	2022-12-31	1,898
Total funding target for all participants	2022-12-31	173,022,362
Balance at beginning of prior year after applicable adjustments	2022-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2022-12-31	0
Amount remaining of carryover balance	2022-12-31	0
Amount remaining of prefunding balance	2022-12-31	0
Present value of excess contributions	2022-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2022-12-31	0
Reductions in caryover balances due to elections or deemed elections	2022-12-31	0
Reductions in prefunding balances due to elections or deemed elections	2022-12-31	0
Balance of carryovers at beginning of current year	2022-12-31	0
Balance of prefunding at beginning of current year	2022-12-31	0
Total employer contributions	2022-12-31	6,922,623
Total employee contributions	2022-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2022-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2022-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2022-12-31	6,421,195
Unpaid minimum required contributions for all prior years	2022-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2022-12-31	0
Remaining amount of unpaid minimum required contributions	2022-12-31	0
Minimum required contributions for current year target normal cost	2022-12-31	2,445,899
Net shortfall amortization installment of oustanding balance	2022-12-31	0
Waiver amortization installment	2022-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2022-12-31	0
Additional cash requirement	2022-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2022-12-31	6,421,195
Unpaid minimum required contributions for current year	2022-12-31	0
Unpaid minimum required contributions for all years	2022-12-31	0
Total participants, beginning-of-year	2022-01-01	1,895
Total number of active participants reported on line 7a of the Form 5500	2022-01-01	477
Number of retired or separated participants receiving benefits	2022-01-01	772
Number of other retired or separated participants entitled to future benefits	2022-01-01	417
Total of all active and inactive participants	2022-01-01	1,666
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2022-01-01	185
Total participants	2022-01-01	1,851
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2022-01-01	87
2021: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2021 401k membership
Market value of plan assets	2021-12-31	227,537,677
Acturial value of plan assets	2021-12-31	205,747,895
Funding target for retired participants and beneficiaries receiving payment	2021-12-31	117,289,777
Number of terminated vested participants	2021-12-31	437
Fundng target for terminated vested participants	2021-12-31	23,147,326
Active participant vested funding target	2021-12-31	29,161,400
Number of active participants	2021-12-31	353
Total funding liabilities for active participants	2021-12-31	30,797,615
Total participant count	2021-12-31	1,741
Total funding target for all participants	2021-12-31	171,234,718
Balance at beginning of prior year after applicable adjustments	2021-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2021-12-31	0
Amount remaining of carryover balance	2021-12-31	0
Amount remaining of prefunding balance	2021-12-31	0
Present value of excess contributions	2021-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2021-12-31	0
Reductions in caryover balances due to elections or deemed elections	2021-12-31	0
Reductions in prefunding balances due to elections or deemed elections	2021-12-31	0
Balance of carryovers at beginning of current year	2021-12-31	0
Balance of prefunding at beginning of current year	2021-12-31	0
Total employer contributions	2021-12-31	0
Total employee contributions	2021-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2021-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2021-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2021-12-31	0
Unpaid minimum required contributions for all prior years	2021-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2021-12-31	0
Remaining amount of unpaid minimum required contributions	2021-12-31	0
Minimum required contributions for current year target normal cost	2021-12-31	2,808,129
Net shortfall amortization installment of oustanding balance	2021-12-31	0
Waiver amortization installment	2021-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2021-12-31	0
Additional cash requirement	2021-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2021-12-31	0
Unpaid minimum required contributions for current year	2021-12-31	0
Unpaid minimum required contributions for all years	2021-12-31	0
Total participants, beginning-of-year	2021-01-01	1,729
Total number of active participants reported on line 7a of the Form 5500	2021-01-01	516
Number of retired or separated participants receiving benefits	2021-01-01	782
Number of other retired or separated participants entitled to future benefits	2021-01-01	417
Total of all active and inactive participants	2021-01-01	1,715
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2021-01-01	180
Total participants	2021-01-01	1,895
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2021-01-01	10
2020: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2020 401k membership
Market value of plan assets	2020-12-31	210,863,274
Acturial value of plan assets	2020-12-31	201,360,376
Funding target for retired participants and beneficiaries receiving payment	2020-12-31	122,148,573
Number of terminated vested participants	2020-12-31	434
Fundng target for terminated vested participants	2020-12-31	23,196,472
Active participant vested funding target	2020-12-31	31,199,698
Number of active participants	2020-12-31	393
Total funding liabilities for active participants	2020-12-31	33,096,544
Total participant count	2020-12-31	1,786
Total funding target for all participants	2020-12-31	178,441,589
Balance at beginning of prior year after applicable adjustments	2020-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2020-12-31	0
Amount remaining of carryover balance	2020-12-31	0
Amount remaining of prefunding balance	2020-12-31	0
Present value of excess contributions	2020-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2020-12-31	0
Reductions in caryover balances due to elections or deemed elections	2020-12-31	0
Reductions in prefunding balances due to elections or deemed elections	2020-12-31	0
Balance of carryovers at beginning of current year	2020-12-31	0
Balance of prefunding at beginning of current year	2020-12-31	0
Total employer contributions	2020-12-31	0
Total employee contributions	2020-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2020-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2020-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2020-12-31	0
Unpaid minimum required contributions for all prior years	2020-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2020-12-31	0
Remaining amount of unpaid minimum required contributions	2020-12-31	0
Minimum required contributions for current year target normal cost	2020-12-31	2,810,104
Net shortfall amortization installment of oustanding balance	2020-12-31	0
Waiver amortization installment	2020-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2020-12-31	0
Additional cash requirement	2020-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2020-12-31	0
Unpaid minimum required contributions for current year	2020-12-31	0
Unpaid minimum required contributions for all years	2020-12-31	0
Total participants, beginning-of-year	2020-01-01	1,775
Total number of active participants reported on line 7a of the Form 5500	2020-01-01	353
Number of retired or separated participants receiving benefits	2020-01-01	781
Number of other retired or separated participants entitled to future benefits	2020-01-01	427
Total of all active and inactive participants	2020-01-01	1,561
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2020-01-01	168
Total participants	2020-01-01	1,729
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2020-01-01	22
2019: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2019 401k membership
Market value of plan assets	2019-12-31	186,238,737
Acturial value of plan assets	2019-12-31	197,143,519
Funding target for retired participants and beneficiaries receiving payment	2019-12-31	120,401,320
Number of terminated vested participants	2019-12-31	438
Fundng target for terminated vested participants	2019-12-31	22,849,689
Active participant vested funding target	2019-12-31	31,826,035
Number of active participants	2019-12-31	405
Total funding liabilities for active participants	2019-12-31	33,643,469
Total participant count	2019-12-31	1,793
Total funding target for all participants	2019-12-31	176,894,478
Balance at beginning of prior year after applicable adjustments	2019-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2019-12-31	0
Carryover balanced portion elected for use to offset prior years funding requirement	2019-12-31	0
Prefunding balanced used to offset prior years funding requirement	2019-12-31	0
Amount remaining of carryover balance	2019-12-31	0
Amount remaining of prefunding balance	2019-12-31	0
Present value of excess contributions	2019-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2019-12-31	0
Reductions in caryover balances due to elections or deemed elections	2019-12-31	0
Reductions in prefunding balances due to elections or deemed elections	2019-12-31	0
Balance of carryovers at beginning of current year	2019-12-31	0
Balance of prefunding at beginning of current year	2019-12-31	0
Total employer contributions	2019-12-31	0
Total employee contributions	2019-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2019-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2019-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2019-12-31	0
Unpaid minimum required contributions for all prior years	2019-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2019-12-31	0
Remaining amount of unpaid minimum required contributions	2019-12-31	0
Minimum required contributions for current year target normal cost	2019-12-31	3,140,986
Net shortfall amortization installment of oustanding balance	2019-12-31	0
Waiver amortization installment	2019-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2019-12-31	0
Additional cash requirement	2019-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2019-12-31	0
Unpaid minimum required contributions for current year	2019-12-31	0
Unpaid minimum required contributions for all years	2019-12-31	0
Total participants, beginning-of-year	2019-01-01	1,783
Total number of active participants reported on line 7a of the Form 5500	2019-01-01	393
Number of retired or separated participants receiving benefits	2019-01-01	794
Number of other retired or separated participants entitled to future benefits	2019-01-01	425
Total of all active and inactive participants	2019-01-01	1,612
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2019-01-01	163
Total participants	2019-01-01	1,775
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2019-01-01	14
2018: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2018 401k membership
Market value of plan assets	2018-12-31	216,343,687
Acturial value of plan assets	2018-12-31	200,067,223
Funding target for retired participants and beneficiaries receiving payment	2018-12-31	110,602,212
Number of terminated vested participants	2018-12-31	449
Fundng target for terminated vested participants	2018-12-31	24,095,384
Active participant vested funding target	2018-12-31	33,317,048
Number of active participants	2018-12-31	391
Total funding liabilities for active participants	2018-12-31	35,385,249
Total participant count	2018-12-31	1,772
Total funding target for all participants	2018-12-31	170,082,845
Balance at beginning of prior year after applicable adjustments	2018-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2018-12-31	0
Carryover balanced portion elected for use to offset prior years funding requirement	2018-12-31	0
Prefunding balanced used to offset prior years funding requirement	2018-12-31	0
Amount remaining of carryover balance	2018-12-31	0
Amount remaining of prefunding balance	2018-12-31	0
Present value of excess contributions	2018-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2018-12-31	0
Balance of carryovers at beginning of current year	2018-12-31	0
Balance of prefunding at beginning of current year	2018-12-31	0
Total employer contributions	2018-12-31	0
Total employee contributions	2018-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2018-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2018-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2018-12-31	0
Unpaid minimum required contributions for all prior years	2018-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2018-12-31	0
Remaining amount of unpaid minimum required contributions	2018-12-31	0
Minimum required contributions for current year target normal cost	2018-12-31	2,683,140
Net shortfall amortization installment of oustanding balance	2018-12-31	0
Waiver amortization installment	2018-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2018-12-31	0
Carryover balance elected to use to offset funding requirement	2018-12-31	0
Prefunding balance elected to use to offset funding requirement	2018-12-31	0
Additional cash requirement	2018-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2018-12-31	0
Unpaid minimum required contributions for current year	2018-12-31	0
Unpaid minimum required contributions for all years	2018-12-31	0
Total participants, beginning-of-year	2018-01-01	1,764
Total number of active participants reported on line 7a of the Form 5500	2018-01-01	405
Number of retired or separated participants receiving benefits	2018-01-01	799
Number of other retired or separated participants entitled to future benefits	2018-01-01	428
Total of all active and inactive participants	2018-01-01	1,632
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2018-01-01	151
Total participants	2018-01-01	1,783
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2018-01-01	0
2017: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2017 401k membership
Market value of plan assets	2017-12-31	46,630,288
Acturial value of plan assets	2017-12-31	47,600,938
Funding target for retired participants and beneficiaries receiving payment	2017-12-31	39,071,058
Number of terminated vested participants	2017-12-31	167
Fundng target for terminated vested participants	2017-12-31	6,149,862
Active participant vested funding target	2017-12-31	624,382
Number of active participants	2017-12-31	3
Total funding liabilities for active participants	2017-12-31	624,382
Total participant count	2017-12-31	593
Total funding target for all participants	2017-12-31	45,845,302
Balance at beginning of prior year after applicable adjustments	2017-12-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2017-12-31	0
Carryover balanced portion elected for use to offset prior years funding requirement	2017-12-31	0
Prefunding balanced used to offset prior years funding requirement	2017-12-31	0
Amount remaining of carryover balance	2017-12-31	0
Amount remaining of prefunding balance	2017-12-31	0
Present value of excess contributions	2017-12-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2017-12-31	0
Balance of carryovers at beginning of current year	2017-12-31	0
Balance of prefunding at beginning of current year	2017-12-31	0
Total employer contributions	2017-12-31	0
Total employee contributions	2017-12-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2017-12-31	0
Contributions made to avoid restrictions adjusted to valuation date	2017-12-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2017-12-31	0
Unpaid minimum required contributions for all prior years	2017-12-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2017-12-31	0
Remaining amount of unpaid minimum required contributions	2017-12-31	0
Minimum required contributions for current year target normal cost	2017-12-31	520,000
Net shortfall amortization installment of oustanding balance	2017-12-31	0
Waiver amortization installment	2017-12-31	0
Total funding amount beforereflecting carryover/prefunding balances	2017-12-31	0
Carryover balance elected to use to offset funding requirement	2017-12-31	0
Prefunding balance elected to use to offset funding requirement	2017-12-31	0
Additional cash requirement	2017-12-31	0
Contributions allocatedtoward minimum required contributions for current year	2017-12-31	0
Unpaid minimum required contributions for current year	2017-12-31	0
Unpaid minimum required contributions for all years	2017-12-31	0
Total participants, beginning-of-year	2017-01-01	593
Total number of active participants reported on line 7a of the Form 5500	2017-01-01	391
Number of retired or separated participants receiving benefits	2017-01-01	786
Number of other retired or separated participants entitled to future benefits	2017-01-01	444
Total of all active and inactive participants	2017-01-01	1,621
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2017-01-01	143
Total participants	2017-01-01	1,764
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2017-01-01	0

Financial Data on CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN

Measure	Date	Value
2022 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2022 401k financial data
Total unrealized appreciation/depreciation of assets	2022-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-12-31	$0
Total income from all sources (including contributions)	2022-12-31	$-59,167,260
Total loss/gain on sale of assets	2022-12-31	$0
Total of all expenses incurred	2022-12-31	$16,918,498
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2022-12-31	$16,804,569
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2022-12-31	$6,922,623
Value of total assets at end of year	2022-12-31	$158,344,172
Value of total assets at beginning of year	2022-12-31	$234,429,930
Total of administrative expenses incurred including professional, contract, advisory and management fees	2022-12-31	$113,929
Total interest from all sources	2022-12-31	$0
Total dividends received (eg from common stock, registered investment company shares)	2022-12-31	$0
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2022-12-31	No
Administrative expenses professional fees incurred	2022-12-31	$113,929
Was this plan covered by a fidelity bond	2022-12-31	Yes
Value of fidelity bond cover	2022-12-31	$5,000,000
Were there any nonexempt tranactions with any party-in-interest	2022-12-31	No
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Value of net income/loss	2022-12-31	$-76,085,758
Value of net assets at end of year (total assets less liabilities)	2022-12-31	$158,344,172
Value of net assets at beginning of year (total assets less liabilities)	2022-12-31	$234,429,930
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2022-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2022-12-31	No
Were any leases to which the plan was party in default or uncollectible	2022-12-31	No
Value of interest in master investment trust accounts at end of year	2022-12-31	$153,832,861
Value of interest in master investment trust accounts at beginning of year	2022-12-31	$234,429,930
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2022-12-31	No
Was there a failure to transmit to the plan any participant contributions	2022-12-31	No
Has the plan failed to provide any benefit when due under the plan	2022-12-31	No
Contributions received in cash from employer	2022-12-31	$6,922,623
Employer contributions (assets) at end of year	2022-12-31	$4,511,311
Employer contributions (assets) at beginning of year	2022-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2022-12-31	$16,804,569
Did the plan have assets held for investment	2022-12-31	No
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2022-12-31	No
Opinion of an independent qualified public accountant for this plan	2022-12-31	Unqualified
Accountancy firm name	2022-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2022-12-31	381357951
2021 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2021 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2021-12-31	$4,106,701
Total unrealized appreciation/depreciation of assets	2021-12-31	$4,106,701
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2021-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2021-12-31	$130,122
Total income from all sources (including contributions)	2021-12-31	$22,761,633
Total loss/gain on sale of assets	2021-12-31	$337,723
Total of all expenses incurred	2021-12-31	$15,739,257
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2021-12-31	$15,227,585
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2021-12-31	$0
Value of total assets at end of year	2021-12-31	$234,429,930
Value of total assets at beginning of year	2021-12-31	$227,537,676
Total of administrative expenses incurred including professional, contract, advisory and management fees	2021-12-31	$511,672
Total interest from all sources	2021-12-31	$0
Total dividends received (eg from common stock, registered investment company shares)	2021-12-31	$1,935,358
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2021-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2021-12-31	$1,935,358
Administrative expenses professional fees incurred	2021-12-31	$22,800
Was this plan covered by a fidelity bond	2021-12-31	Yes
Value of fidelity bond cover	2021-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2021-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2021-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2021-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2021-12-31	$211,149
Administrative expenses (other) incurred	2021-12-31	$16,158
Liabilities. Value of operating payables at end of year	2021-12-31	$0
Liabilities. Value of operating payables at beginning of year	2021-12-31	$130,122
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Value of net income/loss	2021-12-31	$7,022,376
Value of net assets at end of year (total assets less liabilities)	2021-12-31	$234,429,930
Value of net assets at beginning of year (total assets less liabilities)	2021-12-31	$227,407,554
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2021-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2021-12-31	No
Were any leases to which the plan was party in default or uncollectible	2021-12-31	No
Investment advisory and management fees	2021-12-31	$374,290
Value of interest in registered invesment companies (eg mutual funds) at end of year	2021-12-31	$0
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2021-12-31	$217,926,888
Value of interest in master investment trust accounts at end of year	2021-12-31	$234,429,930
Value of interest in master investment trust accounts at beginning of year	2021-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2021-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2021-12-31	$29
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2021-12-31	$29
Asset value of US Government securities at end of year	2021-12-31	$0
Asset value of US Government securities at beginning of year	2021-12-31	$9,399,610
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2021-12-31	$11,483,543
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2021-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2021-12-31	No
Has the plan failed to provide any benefit when due under the plan	2021-12-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2021-12-31	$15,227,585
Contract administrator fees	2021-12-31	$98,424
Did the plan have assets held for investment	2021-12-31	No
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2021-12-31	No
Aggregate proceeds on sale of assets	2021-12-31	$52,947,075
Aggregate carrying amount (costs) on sale of assets	2021-12-31	$52,609,352
Opinion of an independent qualified public accountant for this plan	2021-12-31	Unqualified
Accountancy firm name	2021-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2021-12-31	381357951
2020 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2020 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2020-12-31	$921,755
Total unrealized appreciation/depreciation of assets	2020-12-31	$921,755
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2020-12-31	$130,122
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2020-12-31	$130,202
Total income from all sources (including contributions)	2020-12-31	$30,858,926
Total loss/gain on sale of assets	2020-12-31	$1,457,340
Total of all expenses incurred	2020-12-31	$14,184,443
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2020-12-31	$13,347,745
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2020-12-31	$0
Value of total assets at end of year	2020-12-31	$227,537,676
Value of total assets at beginning of year	2020-12-31	$210,863,273
Total of administrative expenses incurred including professional, contract, advisory and management fees	2020-12-31	$836,698
Total interest from all sources	2020-12-31	$3
Total dividends received (eg from common stock, registered investment company shares)	2020-12-31	$5,074,444
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2020-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2020-12-31	$5,074,444
Administrative expenses professional fees incurred	2020-12-31	$64,275
Was this plan covered by a fidelity bond	2020-12-31	Yes
Value of fidelity bond cover	2020-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2020-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2020-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2020-12-31	$211,149
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2020-12-31	$252,722
Administrative expenses (other) incurred	2020-12-31	$208,271
Liabilities. Value of operating payables at end of year	2020-12-31	$130,122
Liabilities. Value of operating payables at beginning of year	2020-12-31	$130,202
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Value of net income/loss	2020-12-31	$16,674,483
Value of net assets at end of year (total assets less liabilities)	2020-12-31	$227,407,554
Value of net assets at beginning of year (total assets less liabilities)	2020-12-31	$210,733,071
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2020-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2020-12-31	No
Were any leases to which the plan was party in default or uncollectible	2020-12-31	No
Investment advisory and management fees	2020-12-31	$454,303
Value of interest in registered invesment companies (eg mutual funds) at end of year	2020-12-31	$217,926,888
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2020-12-31	$198,921,801
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2020-12-31	$29
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2020-12-31	$68
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2020-12-31	$68
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2020-12-31	$3
Asset value of US Government securities at end of year	2020-12-31	$9,399,610
Asset value of US Government securities at beginning of year	2020-12-31	$11,688,682
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2020-12-31	$23,405,384
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2020-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2020-12-31	No
Has the plan failed to provide any benefit when due under the plan	2020-12-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2020-12-31	$13,347,745
Contract administrator fees	2020-12-31	$109,849
Did the plan have assets held for investment	2020-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2020-12-31	No
Aggregate proceeds on sale of assets	2020-12-31	$22,380,481
Aggregate carrying amount (costs) on sale of assets	2020-12-31	$20,923,141
Opinion of an independent qualified public accountant for this plan	2020-12-31	Disclaimer
Accountancy firm name	2020-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2020-12-31	381357951
2019 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2019 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2019-12-31	$1,100,045
Total unrealized appreciation/depreciation of assets	2019-12-31	$1,100,045
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2019-12-31	$130,202
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2019-12-31	$124,609
Total income from all sources (including contributions)	2019-12-31	$38,823,041
Total loss/gain on sale of assets	2019-12-31	$1,105,398
Total of all expenses incurred	2019-12-31	$14,204,098
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2019-12-31	$12,780,606
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2019-12-31	$0
Value of total assets at end of year	2019-12-31	$210,863,273
Value of total assets at beginning of year	2019-12-31	$186,238,737
Total of administrative expenses incurred including professional, contract, advisory and management fees	2019-12-31	$1,423,492
Total interest from all sources	2019-12-31	$9
Total dividends received (eg from common stock, registered investment company shares)	2019-12-31	$5,868,032
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2019-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2019-12-31	$5,868,032
Administrative expenses professional fees incurred	2019-12-31	$30,000
Was this plan covered by a fidelity bond	2019-12-31	Yes
Value of fidelity bond cover	2019-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2019-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2019-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2019-12-31	$252,722
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2019-12-31	$283,272
Administrative expenses (other) incurred	2019-12-31	$795,834
Liabilities. Value of operating payables at end of year	2019-12-31	$130,202
Liabilities. Value of operating payables at beginning of year	2019-12-31	$124,609
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Value of net income/loss	2019-12-31	$24,618,943
Value of net assets at end of year (total assets less liabilities)	2019-12-31	$210,733,071
Value of net assets at beginning of year (total assets less liabilities)	2019-12-31	$186,114,128
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2019-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2019-12-31	No
Were any leases to which the plan was party in default or uncollectible	2019-12-31	No
Investment advisory and management fees	2019-12-31	$451,920
Value of interest in registered invesment companies (eg mutual funds) at end of year	2019-12-31	$198,921,801
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2019-12-31	$169,018,459
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2019-12-31	$68
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2019-12-31	$792
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2019-12-31	$792
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2019-12-31	$9
Asset value of US Government securities at end of year	2019-12-31	$11,688,682
Asset value of US Government securities at beginning of year	2019-12-31	$16,936,214
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2019-12-31	$30,749,557
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2019-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2019-12-31	No
Has the plan failed to provide any benefit when due under the plan	2019-12-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2019-12-31	$12,780,606
Contract administrator fees	2019-12-31	$145,738
Did the plan have assets held for investment	2019-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2019-12-31	No
Aggregate proceeds on sale of assets	2019-12-31	$39,466,343
Aggregate carrying amount (costs) on sale of assets	2019-12-31	$38,360,945
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2019-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2019-12-31	Disclaimer
Accountancy firm name	2019-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2019-12-31	381357951
2018 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2018 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2018-12-31	$298,588
Total unrealized appreciation/depreciation of assets	2018-12-31	$298,588
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$124,609
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$39,520
Total income from all sources (including contributions)	2018-12-31	$-13,828,522
Total loss/gain on sale of assets	2018-12-31	$-154,556
Total of all expenses incurred	2018-12-31	$16,361,518
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2018-12-31	$15,165,260
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2018-12-31	$0
Value of total assets at end of year	2018-12-31	$186,238,737
Value of total assets at beginning of year	2018-12-31	$216,343,688
Total of administrative expenses incurred including professional, contract, advisory and management fees	2018-12-31	$1,196,258
Total interest from all sources	2018-12-31	$225
Total dividends received (eg from common stock, registered investment company shares)	2018-12-31	$5,355,980
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2018-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2018-12-31	$5,355,980
Administrative expenses professional fees incurred	2018-12-31	$175,265
Was this plan covered by a fidelity bond	2018-12-31	Yes
Value of fidelity bond cover	2018-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2018-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2018-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2018-12-31	$283,272
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2018-12-31	$1,041,698
Administrative expenses (other) incurred	2018-12-31	$265,780
Liabilities. Value of operating payables at end of year	2018-12-31	$124,609
Liabilities. Value of operating payables at beginning of year	2018-12-31	$39,520
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Value of net income/loss	2018-12-31	$-30,190,040
Value of net assets at end of year (total assets less liabilities)	2018-12-31	$186,114,128
Value of net assets at beginning of year (total assets less liabilities)	2018-12-31	$216,304,168
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2018-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2018-12-31	No
Were any leases to which the plan was party in default or uncollectible	2018-12-31	No
Investment advisory and management fees	2018-12-31	$623,905
Value of interest in registered invesment companies (eg mutual funds) at end of year	2018-12-31	$169,018,459
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2018-12-31	$210,149,370
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2018-12-31	$792
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2018-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2018-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2018-12-31	$225
Asset value of US Government securities at end of year	2018-12-31	$16,936,214
Asset value of US Government securities at beginning of year	2018-12-31	$5,152,620
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2018-12-31	$-19,328,759
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2018-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2018-12-31	No
Has the plan failed to provide any benefit when due under the plan	2018-12-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2018-12-31	$15,165,260
Contract administrator fees	2018-12-31	$131,308
Did the plan have assets held for investment	2018-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2018-12-31	No
Aggregate proceeds on sale of assets	2018-12-31	$66,047,697
Aggregate carrying amount (costs) on sale of assets	2018-12-31	$66,202,253
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2018-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2018-12-31	Disclaimer
Accountancy firm name	2018-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2018-12-31	381357951
2017 : CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2017 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2017-12-31	$250,099
Total unrealized appreciation/depreciation of assets	2017-12-31	$250,099
Total transfer of assets to this plan	2017-12-31	$168,526,956
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$39,520
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$39,488
Total income from all sources (including contributions)	2017-12-31	$5,656,303
Total loss/gain on sale of assets	2017-12-31	$74,768
Total of all expenses incurred	2017-12-31	$4,469,890
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-12-31	$3,927,429
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2017-12-31	$0
Value of total assets at end of year	2017-12-31	$216,343,688
Value of total assets at beginning of year	2017-12-31	$46,630,287
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-12-31	$542,461
Total interest from all sources	2017-12-31	$32
Total dividends received (eg from common stock, registered investment company shares)	2017-12-31	$1,331,287
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2017-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2017-12-31	$1,331,287
Administrative expenses professional fees incurred	2017-12-31	$11,175
Was this plan covered by a fidelity bond	2017-12-31	Yes
Value of fidelity bond cover	2017-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2017-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2017-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2017-12-31	$1,041,698
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2017-12-31	$77,539
Administrative expenses (other) incurred	2017-12-31	$312,490
Liabilities. Value of operating payables at end of year	2017-12-31	$39,520
Liabilities. Value of operating payables at beginning of year	2017-12-31	$39,488
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Value of net income/loss	2017-12-31	$1,186,413
Value of net assets at end of year (total assets less liabilities)	2017-12-31	$216,304,168
Value of net assets at beginning of year (total assets less liabilities)	2017-12-31	$46,590,799
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2017-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2017-12-31	No
Were any leases to which the plan was party in default or uncollectible	2017-12-31	No
Investment advisory and management fees	2017-12-31	$143,519
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-12-31	$210,149,370
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-12-31	$41,749,966
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2017-12-31	$32
Asset value of US Government securities at end of year	2017-12-31	$5,152,620
Asset value of US Government securities at beginning of year	2017-12-31	$4,802,782
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-12-31	$4,000,117
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2017-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2017-12-31	No
Has the plan failed to provide any benefit when due under the plan	2017-12-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2017-12-31	$3,927,429
Contract administrator fees	2017-12-31	$75,277
Did the plan have assets held for investment	2017-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2017-12-31	No
Aggregate proceeds on sale of assets	2017-12-31	$8,588,615
Aggregate carrying amount (costs) on sale of assets	2017-12-31	$8,513,847
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2017-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2017-12-31	Disclaimer
Accountancy firm name	2017-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2017-12-31	381357951

Form 5500 Responses for CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN

2022: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2022 form 5500 responses
2022-01-01	Type of plan entity	Single employer plan
2022-01-01	Submission has been amended	No
2022-01-01	This submission is the final filing	No
2022-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2022-01-01	Plan is a collectively bargained plan	Yes
2022-01-01	Plan funding arrangement – Trust	Yes
2022-01-01	Plan benefit arrangement - Trust	Yes
2021: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2021 form 5500 responses
2021-01-01	Type of plan entity	Single employer plan
2021-01-01	Submission has been amended	No
2021-01-01	This submission is the final filing	No
2021-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2021-01-01	Plan is a collectively bargained plan	Yes
2021-01-01	Plan funding arrangement – Trust	Yes
2021-01-01	Plan benefit arrangement - Trust	Yes
2020: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2020 form 5500 responses
2020-01-01	Type of plan entity	Single employer plan
2020-01-01	Submission has been amended	No
2020-01-01	This submission is the final filing	No
2020-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2020-01-01	Plan is a collectively bargained plan	Yes
2020-01-01	Plan funding arrangement – Trust	Yes
2020-01-01	Plan benefit arrangement - Trust	Yes
2019: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2019 form 5500 responses
2019-01-01	Type of plan entity	Single employer plan
2019-01-01	Submission has been amended	No
2019-01-01	This submission is the final filing	No
2019-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2019-01-01	Plan is a collectively bargained plan	Yes
2019-01-01	Plan funding arrangement – Trust	Yes
2019-01-01	Plan benefit arrangement - Trust	Yes
2018: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2018 form 5500 responses
2018-01-01	Type of plan entity	Single employer plan
2018-01-01	Submission has been amended	No
2018-01-01	This submission is the final filing	No
2018-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2018-01-01	Plan is a collectively bargained plan	Yes
2018-01-01	Plan funding arrangement – Trust	Yes
2018-01-01	Plan benefit arrangement - Trust	Yes
2017: CENTURY ALUMINUM CONSOLIDATED RETIREMENT PLAN 2017 form 5500 responses
2017-01-01	Type of plan entity	Single employer plan
2017-01-01	Submission has been amended	No
2017-01-01	This submission is the final filing	No
2017-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2017-01-01	Plan is a collectively bargained plan	Yes
2017-01-01	Plan funding arrangement – Trust	Yes
2017-01-01	Plan benefit arrangement - Trust	Yes

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Company Name:	CENTURY ALUMINUM COMPANY
Employer identification number (EIN):	133070826
NAIC Classification:	331310

Jurisdiction of Incorporation:	State of Delaware Division of Corporations
Incorporation Date:
Company Identification Number:	0908570