401k Plan data: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN plan

CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 401k Plan overview

Plan Name	CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN
Plan identification number	001

CENTURY ALUMINUM EMPLOYEES 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) Covered by PBGC - Plan is covered under the PBGC insurance program (see ERISA section 4021). 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 EMPLOYEES RETIREMENT PLAN

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
001 2017-09-01 KYLE SHERLOCK
001 2016-09-01 KYLE SHERLOCK
001 2015-09-01 KYLE SHERLOCK
001 2015-01-01 KYLE SHERLOCK
001 2014-01-01 JESSE GARY
001 2013-01-01 JESSE GARY
001 2012-01-01 ERICH SQUIRE
001 2011-01-01 WILLIAM J. LEATHERBERRY
001 2010-01-01 WILLIAM J. LEATHERBERRY
001 2009-01-01 WILLIAM LEATHERBERRY

Plan id#	Filing Submission Date	Name of Administrator
001	2017-09-01	KYLE SHERLOCK
001	2016-09-01	KYLE SHERLOCK
001	2015-09-01	KYLE SHERLOCK
001	2015-01-01	KYLE SHERLOCK
001	2014-01-01	JESSE GARY
001	2013-01-01	JESSE GARY
001	2012-01-01	ERICH SQUIRE
001	2011-01-01	WILLIAM J. LEATHERBERRY
001	2010-01-01	WILLIAM J. LEATHERBERRY
001	2009-01-01	WILLIAM LEATHERBERRY

Plan Statistics for CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN

401k plan membership statisitcs for CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN

Measure Date Value
2017: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2017 401k membership
Market value of plan assets 2017-12-31 162,382,308
Acturial value of plan assets 2017-12-31 154,819,398
Funding target for retired participants and beneficiaries receiving payment 2017-12-31 68,709,274
Number of terminated vested participants 2017-12-31 281
Fundng target for terminated vested participants 2017-12-31 17,968,992
Active participant vested funding target 2017-12-31 33,555,947
Number of active participants 2017-12-31 395
Total funding liabilities for active participants 2017-12-31 35,778,007
Total participant count 2017-12-31 1,170
Total funding target for all participants 2017-12-31 122,456,273
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
Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance 2017-12-31 0
Reductions in caryover balances due to elections or deemed elections 2017-12-31 0
Reductions in prefunding balances due to elections or deemed elections 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 2017-12-31 738,699
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
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 2017-09-01 1,164
Total number of active participants reported on line 7a of the Form 5500 2017-09-01 0
Number of retired or separated participants receiving benefits 2017-09-01 0
Number of other retired or separated participants entitled to future benefits 2017-09-01 0
Total of all active and inactive participants 2017-09-01 0
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2017-09-01 0
Total participants 2017-09-01 0
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2017-09-01 0
Market value of plan assets 2017-08-31 153,932,394
Acturial value of plan assets 2017-08-31 155,517,045
Funding target for retired participants and beneficiaries receiving payment 2017-08-31 64,146,832
Number of terminated vested participants 2017-08-31 268
Fundng target for terminated vested participants 2017-08-31 17,368,354
Active participant vested funding target 2017-08-31 36,461,152
Number of active participants 2017-08-31 415
Total funding liabilities for active participants 2017-08-31 40,515,828
Total participant count 2017-08-31 1,157
Total funding target for all participants 2017-08-31 122,031,014
Balance at beginning of prior year after applicable adjustments 2017-08-31 0
Prefunding balance at beginning of prior year after applicable adjustments 2017-08-31 0
Carryover balanced portion elected for use to offset prior years funding requirement 2017-08-31 0
Prefunding balanced used to offset prior years funding requirement 2017-08-31 0
Amount remaining of carryover balance 2017-08-31 0
Amount remaining of prefunding balance 2017-08-31 0
Present value of excess contributions 2017-08-31 0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance 2017-08-31 0
Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance 2017-08-31 0
Reductions in caryover balances due to elections or deemed elections 2017-08-31 0
Reductions in prefunding balances due to elections or deemed elections 2017-08-31 0
Balance of carryovers at beginning of current year 2017-08-31 0
Balance of prefunding at beginning of current year 2017-08-31 0
Total employer contributions 2017-08-31 0
Total employee contributions 2017-08-31 0
Contributions allocated toward unpaid minimum require contributions from prior years 2017-08-31 0
Contributions made to avoid restrictions adjusted to valuation date 2017-08-31 0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date 2017-08-31 0
Unpaid minimum required contributions for all prior years 2017-08-31 0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years 2017-08-31 0
Remaining amount of unpaid minimum required contributions 2017-08-31 0
Minimum required contributions for current year target normal cost 2017-08-31 2,553,818
Net shortfall amortization installment of oustanding balance 2017-08-31 0
Total funding amount beforereflecting carryover/prefunding balances 2017-08-31 0
Additional cash requirement 2017-08-31 0
Contributions allocatedtoward minimum required contributions for current year 2017-08-31 0
Unpaid minimum required contributions for current year 2017-08-31 0
Unpaid minimum required contributions for all years 2017-08-31 0
2016: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2016 401k membership
Total participants, beginning-of-year 2016-09-01 1,157
Total number of active participants reported on line 7a of the Form 5500 2016-09-01 395
Number of retired or separated participants receiving benefits 2016-09-01 451
Number of other retired or separated participants entitled to future benefits 2016-09-01 281
Total of all active and inactive participants 2016-09-01 1,127
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2016-09-01 37
Total participants 2016-09-01 1,164
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2016-09-01 3
2015: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2015 401k membership
Total participants, beginning-of-year 2015-09-01 1,236
Total number of active participants reported on line 7a of the Form 5500 2015-09-01 415
Number of retired or separated participants receiving benefits 2015-09-01 442
Number of other retired or separated participants entitled to future benefits 2015-09-01 268
Total of all active and inactive participants 2015-09-01 1,125
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2015-09-01 32
Total participants 2015-09-01 1,157
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2015-09-01 55
Total participants, beginning-of-year 2015-01-01 578
Total number of active participants reported on line 7a of the Form 5500 2015-01-01 663
Number of retired or separated participants receiving benefits 2015-01-01 373
Number of other retired or separated participants entitled to future benefits 2015-01-01 167
Total of all active and inactive participants 2015-01-01 1,203
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2015-01-01 29
Total participants 2015-01-01 1,232
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2015-01-01 15
2014: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2014 401k membership
Total participants, beginning-of-year 2014-01-01 680
Total number of active participants reported on line 7a of the Form 5500 2014-01-01 255
Number of retired or separated participants receiving benefits 2014-01-01 247
Number of other retired or separated participants entitled to future benefits 2014-01-01 53
Total of all active and inactive participants 2014-01-01 555
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2014-01-01 21
Total participants 2014-01-01 576
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2014-01-01 11
2013: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2013 401k membership
Total participants, beginning-of-year 2013-01-01 553
Total number of active participants reported on line 7a of the Form 5500 2013-01-01 274
Number of retired or separated participants receiving benefits 2013-01-01 229
Number of other retired or separated participants entitled to future benefits 2013-01-01 158
Total of all active and inactive participants 2013-01-01 661
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2013-01-01 19
Total participants 2013-01-01 680
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2013-01-01 13
2012: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2012 401k membership
Total participants, beginning-of-year 2012-01-01 518
Total number of active participants reported on line 7a of the Form 5500 2012-01-01 169
Number of retired or separated participants receiving benefits 2012-01-01 219
Number of other retired or separated participants entitled to future benefits 2012-01-01 144
Total of all active and inactive participants 2012-01-01 532
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2012-01-01 21
Total participants 2012-01-01 553
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2012-01-01 6
2011: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2011 401k membership
Total participants, beginning-of-year 2011-01-01 524
Total number of active participants reported on line 7a of the Form 5500 2011-01-01 161
Number of retired or separated participants receiving benefits 2011-01-01 203
Number of other retired or separated participants entitled to future benefits 2011-01-01 138
Total of all active and inactive participants 2011-01-01 502
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2011-01-01 16
Total participants 2011-01-01 518
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2011-01-01 12
2010: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2010 401k membership
Total participants, beginning-of-year 2010-01-01 505
Total number of active participants reported on line 7a of the Form 5500 2010-01-01 182
Number of retired or separated participants receiving benefits 2010-01-01 184
Number of other retired or separated participants entitled to future benefits 2010-01-01 140
Total of all active and inactive participants 2010-01-01 506
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2010-01-01 18
Total participants 2010-01-01 524
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2010-01-01 7
2009: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2009 401k membership
Total participants, beginning-of-year 2009-01-01 510
Total number of active participants reported on line 7a of the Form 5500 2009-01-01 176
Number of retired or separated participants receiving benefits 2009-01-01 173
Number of other retired or separated participants entitled to future benefits 2009-01-01 141
Total of all active and inactive participants 2009-01-01 490
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2009-01-01 15
Total participants 2009-01-01 505
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2009-01-01 29

Measure	Date	Value
2017: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2017 401k membership
Market value of plan assets	2017-12-31	162,382,308
Acturial value of plan assets	2017-12-31	154,819,398
Funding target for retired participants and beneficiaries receiving payment	2017-12-31	68,709,274
Number of terminated vested participants	2017-12-31	281
Fundng target for terminated vested participants	2017-12-31	17,968,992
Active participant vested funding target	2017-12-31	33,555,947
Number of active participants	2017-12-31	395
Total funding liabilities for active participants	2017-12-31	35,778,007
Total participant count	2017-12-31	1,170
Total funding target for all participants	2017-12-31	122,456,273
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
Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance	2017-12-31	0
Reductions in caryover balances due to elections or deemed elections	2017-12-31	0
Reductions in prefunding balances due to elections or deemed elections	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	738,699
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
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	2017-09-01	1,164
Total number of active participants reported on line 7a of the Form 5500	2017-09-01	0
Number of retired or separated participants receiving benefits	2017-09-01	0
Number of other retired or separated participants entitled to future benefits	2017-09-01	0
Total of all active and inactive participants	2017-09-01	0
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2017-09-01	0
Total participants	2017-09-01	0
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2017-09-01	0
Market value of plan assets	2017-08-31	153,932,394
Acturial value of plan assets	2017-08-31	155,517,045
Funding target for retired participants and beneficiaries receiving payment	2017-08-31	64,146,832
Number of terminated vested participants	2017-08-31	268
Fundng target for terminated vested participants	2017-08-31	17,368,354
Active participant vested funding target	2017-08-31	36,461,152
Number of active participants	2017-08-31	415
Total funding liabilities for active participants	2017-08-31	40,515,828
Total participant count	2017-08-31	1,157
Total funding target for all participants	2017-08-31	122,031,014
Balance at beginning of prior year after applicable adjustments	2017-08-31	0
Prefunding balance at beginning of prior year after applicable adjustments	2017-08-31	0
Carryover balanced portion elected for use to offset prior years funding requirement	2017-08-31	0
Prefunding balanced used to offset prior years funding requirement	2017-08-31	0
Amount remaining of carryover balance	2017-08-31	0
Amount remaining of prefunding balance	2017-08-31	0
Present value of excess contributions	2017-08-31	0
Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance	2017-08-31	0
Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance	2017-08-31	0
Reductions in caryover balances due to elections or deemed elections	2017-08-31	0
Reductions in prefunding balances due to elections or deemed elections	2017-08-31	0
Balance of carryovers at beginning of current year	2017-08-31	0
Balance of prefunding at beginning of current year	2017-08-31	0
Total employer contributions	2017-08-31	0
Total employee contributions	2017-08-31	0
Contributions allocated toward unpaid minimum require contributions from prior years	2017-08-31	0
Contributions made to avoid restrictions adjusted to valuation date	2017-08-31	0
Contributions allocated toward minimum required contributions for current year adjusted to valuation date	2017-08-31	0
Unpaid minimum required contributions for all prior years	2017-08-31	0
iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years	2017-08-31	0
Remaining amount of unpaid minimum required contributions	2017-08-31	0
Minimum required contributions for current year target normal cost	2017-08-31	2,553,818
Net shortfall amortization installment of oustanding balance	2017-08-31	0
Total funding amount beforereflecting carryover/prefunding balances	2017-08-31	0
Additional cash requirement	2017-08-31	0
Contributions allocatedtoward minimum required contributions for current year	2017-08-31	0
Unpaid minimum required contributions for current year	2017-08-31	0
Unpaid minimum required contributions for all years	2017-08-31	0
2016: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2016 401k membership
Total participants, beginning-of-year	2016-09-01	1,157
Total number of active participants reported on line 7a of the Form 5500	2016-09-01	395
Number of retired or separated participants receiving benefits	2016-09-01	451
Number of other retired or separated participants entitled to future benefits	2016-09-01	281
Total of all active and inactive participants	2016-09-01	1,127
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2016-09-01	37
Total participants	2016-09-01	1,164
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2016-09-01	3
2015: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2015 401k membership
Total participants, beginning-of-year	2015-09-01	1,236
Total number of active participants reported on line 7a of the Form 5500	2015-09-01	415
Number of retired or separated participants receiving benefits	2015-09-01	442
Number of other retired or separated participants entitled to future benefits	2015-09-01	268
Total of all active and inactive participants	2015-09-01	1,125
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2015-09-01	32
Total participants	2015-09-01	1,157
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2015-09-01	55
Total participants, beginning-of-year	2015-01-01	578
Total number of active participants reported on line 7a of the Form 5500	2015-01-01	663
Number of retired or separated participants receiving benefits	2015-01-01	373
Number of other retired or separated participants entitled to future benefits	2015-01-01	167
Total of all active and inactive participants	2015-01-01	1,203
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2015-01-01	29
Total participants	2015-01-01	1,232
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2015-01-01	15
2014: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2014 401k membership
Total participants, beginning-of-year	2014-01-01	680
Total number of active participants reported on line 7a of the Form 5500	2014-01-01	255
Number of retired or separated participants receiving benefits	2014-01-01	247
Number of other retired or separated participants entitled to future benefits	2014-01-01	53
Total of all active and inactive participants	2014-01-01	555
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2014-01-01	21
Total participants	2014-01-01	576
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2014-01-01	11
2013: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2013 401k membership
Total participants, beginning-of-year	2013-01-01	553
Total number of active participants reported on line 7a of the Form 5500	2013-01-01	274
Number of retired or separated participants receiving benefits	2013-01-01	229
Number of other retired or separated participants entitled to future benefits	2013-01-01	158
Total of all active and inactive participants	2013-01-01	661
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2013-01-01	19
Total participants	2013-01-01	680
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2013-01-01	13
2012: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2012 401k membership
Total participants, beginning-of-year	2012-01-01	518
Total number of active participants reported on line 7a of the Form 5500	2012-01-01	169
Number of retired or separated participants receiving benefits	2012-01-01	219
Number of other retired or separated participants entitled to future benefits	2012-01-01	144
Total of all active and inactive participants	2012-01-01	532
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2012-01-01	21
Total participants	2012-01-01	553
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2012-01-01	6
2011: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2011 401k membership
Total participants, beginning-of-year	2011-01-01	524
Total number of active participants reported on line 7a of the Form 5500	2011-01-01	161
Number of retired or separated participants receiving benefits	2011-01-01	203
Number of other retired or separated participants entitled to future benefits	2011-01-01	138
Total of all active and inactive participants	2011-01-01	502
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2011-01-01	16
Total participants	2011-01-01	518
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2011-01-01	12
2010: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2010 401k membership
Total participants, beginning-of-year	2010-01-01	505
Total number of active participants reported on line 7a of the Form 5500	2010-01-01	182
Number of retired or separated participants receiving benefits	2010-01-01	184
Number of other retired or separated participants entitled to future benefits	2010-01-01	140
Total of all active and inactive participants	2010-01-01	506
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2010-01-01	18
Total participants	2010-01-01	524
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2010-01-01	7
2009: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2009 401k membership
Total participants, beginning-of-year	2009-01-01	510
Total number of active participants reported on line 7a of the Form 5500	2009-01-01	176
Number of retired or separated participants receiving benefits	2009-01-01	173
Number of other retired or separated participants entitled to future benefits	2009-01-01	141
Total of all active and inactive participants	2009-01-01	490
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2009-01-01	15
Total participants	2009-01-01	505
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2009-01-01	29

Financial Data on CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN

Measure	Date	Value
2017 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2017 401k financial data
Total unrealized appreciation/depreciation of assets	2017-12-31	$0
Total transfer of assets from 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	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$0
Total income from all sources (including contributions)	2017-12-31	$9,313,112
Total loss/gain on sale of assets	2017-12-31	$0
Total of all expenses incurred	2017-12-31	$3,168,464
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-12-31	$3,047,659
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	$0
Value of total assets at beginning of year	2017-12-31	$162,382,308
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-12-31	$120,805
Total interest from all sources	2017-12-31	$11
Total dividends received (eg from common stock, registered investment company shares)	2017-12-31	$2,966,337
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	$2,966,337
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	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2017-12-31	$170,394
Administrative expenses (other) incurred	2017-12-31	$12,122
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Value of net income/loss	2017-12-31	$6,144,648
Value of net assets at end of year (total assets less liabilities)	2017-12-31	$0
Value of net assets at beginning of year (total assets less liabilities)	2017-12-31	$162,382,308
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	$97,496
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-12-31	$0
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-12-31	$162,211,914
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2017-12-31	$11
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-12-31	$6,346,764
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	$3,047,659
Contract administrator fees	2017-12-31	$11,187
Did the plan have assets held for investment	2017-12-31	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	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	Yes
Aggregate proceeds on sale of assets	2017-12-31	$242,005
Aggregate carrying amount (costs) on sale of assets	2017-12-31	$242,005
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
Total unrealized appreciation/depreciation of assets	2017-08-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-08-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-08-31	$0
Total income from all sources (including contributions)	2017-08-31	$18,705,431
Total loss/gain on sale of assets	2017-08-31	$0
Total of all expenses incurred	2017-08-31	$10,255,517
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-08-31	$9,549,291
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2017-08-31	$0
Value of total assets at end of year	2017-08-31	$162,382,308
Value of total assets at beginning of year	2017-08-31	$153,932,394
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-08-31	$706,226
Total interest from all sources	2017-08-31	$5
Total dividends received (eg from common stock, registered investment company shares)	2017-08-31	$4,160,442
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2017-08-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2017-08-31	$4,160,442
Administrative expenses professional fees incurred	2017-08-31	$58,625
Was this plan covered by a fidelity bond	2017-08-31	Yes
Value of fidelity bond cover	2017-08-31	$5,000,000
Were there any nonexempt tranactions with any party-in-interest	2017-08-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2017-08-31	$170,394
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2017-08-31	$161,852
Administrative expenses (other) incurred	2017-08-31	$242,730
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-08-31	No
Value of net income/loss	2017-08-31	$8,449,914
Value of net assets at end of year (total assets less liabilities)	2017-08-31	$162,382,308
Value of net assets at beginning of year (total assets less liabilities)	2017-08-31	$153,932,394
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2017-08-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2017-08-31	No
Were any leases to which the plan was party in default or uncollectible	2017-08-31	No
Investment advisory and management fees	2017-08-31	$375,433
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-08-31	$162,211,914
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-08-31	$153,770,542
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2017-08-31	$5
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-08-31	$14,544,984
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2017-08-31	No
Was there a failure to transmit to the plan any participant contributions	2017-08-31	No
Has the plan failed to provide any benefit when due under the plan	2017-08-31	No
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2017-08-31	$9,549,291
Contract administrator fees	2017-08-31	$29,438
Did the plan have assets held for investment	2017-08-31	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	2017-08-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2017-08-31	No
Aggregate proceeds on sale of assets	2017-08-31	$482,365
Aggregate carrying amount (costs) on sale of assets	2017-08-31	$482,365
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2017-08-31	Yes
Opinion of an independent qualified public accountant for this plan	2017-08-31	Disclaimer
Accountancy firm name	2017-08-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2017-08-31	381357951
2016 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2016 401k financial data
Total unrealized appreciation/depreciation of assets	2016-08-31	$0
Total transfer of assets to this plan	2016-08-31	$45,433
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2016-08-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2016-08-31	$0
Total income from all sources (including contributions)	2016-08-31	$14,441,571
Total loss/gain on sale of assets	2016-08-31	$0
Total of all expenses incurred	2016-08-31	$19,382,290
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2016-08-31	$18,585,329
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2016-08-31	$0
Value of total assets at end of year	2016-08-31	$153,932,394
Value of total assets at beginning of year	2016-08-31	$158,827,680
Total of administrative expenses incurred including professional, contract, advisory and management fees	2016-08-31	$796,961
Total interest from all sources	2016-08-31	$74
Total dividends received (eg from common stock, registered investment company shares)	2016-08-31	$3,904,971
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2016-08-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2016-08-31	$3,904,971
Administrative expenses professional fees incurred	2016-08-31	$52,678
Was this plan covered by a fidelity bond	2016-08-31	Yes
Value of fidelity bond cover	2016-08-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2016-08-31	$0
Were there any nonexempt tranactions with any party-in-interest	2016-08-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2016-08-31	$161,852
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2016-08-31	$197,794
Administrative expenses (other) incurred	2016-08-31	$338,505
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2016-08-31	No
Value of net income/loss	2016-08-31	$-4,940,719
Value of net assets at end of year (total assets less liabilities)	2016-08-31	$153,932,394
Value of net assets at beginning of year (total assets less liabilities)	2016-08-31	$158,827,680
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2016-08-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2016-08-31	No
Were any leases to which the plan was party in default or uncollectible	2016-08-31	No
Investment advisory and management fees	2016-08-31	$373,081
Value of interest in registered invesment companies (eg mutual funds) at end of year	2016-08-31	$153,770,542
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2016-08-31	$157,502,886
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2016-08-31	$74
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2016-08-31	$10,536,526
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2016-08-31	Yes
Was there a failure to transmit to the plan any participant contributions	2016-08-31	No
Has the plan failed to provide any benefit when due under the plan	2016-08-31	No
Employer contributions (assets) at end of year	2016-08-31	$0
Employer contributions (assets) at beginning of year	2016-08-31	$1,127,000
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2016-08-31	$18,585,329
Contract administrator fees	2016-08-31	$32,697
Did the plan have assets held for investment	2016-08-31	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	2016-08-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2016-08-31	No
Aggregate proceeds on sale of assets	2016-08-31	$48,764,526
Aggregate carrying amount (costs) on sale of assets	2016-08-31	$48,764,526
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2016-08-31	Yes
Opinion of an independent qualified public accountant for this plan	2016-08-31	Disclaimer
Accountancy firm name	2016-08-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2016-08-31	381357951
2015 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2015 401k financial data
Total unrealized appreciation/depreciation of assets	2015-08-31	$0
Total transfer of assets to this plan	2015-08-31	$109,412,761
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2015-08-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2015-08-31	$114,083
Total income from all sources (including contributions)	2015-08-31	$-106,714
Total loss/gain on sale of assets	2015-08-31	$0
Total of all expenses incurred	2015-08-31	$2,116,863
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2015-08-31	$1,909,629
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2015-08-31	$1,867,500
Value of total assets at end of year	2015-08-31	$158,827,680
Value of total assets at beginning of year	2015-08-31	$51,752,579
Total of administrative expenses incurred including professional, contract, advisory and management fees	2015-08-31	$207,234
Total interest from all sources	2015-08-31	$14
Total dividends received (eg from common stock, registered investment company shares)	2015-08-31	$486,382
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2015-08-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2015-08-31	$486,382
Was this plan covered by a fidelity bond	2015-08-31	Yes
Value of fidelity bond cover	2015-08-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2015-08-31	$0
Were there any nonexempt tranactions with any party-in-interest	2015-08-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2015-08-31	$197,794
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2015-08-31	$40,711
Administrative expenses (other) incurred	2015-08-31	$72,303
Liabilities. Value of operating payables at end of year	2015-08-31	$0
Liabilities. Value of operating payables at beginning of year	2015-08-31	$114,083
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2015-08-31	No
Value of net income/loss	2015-08-31	$-2,223,577
Value of net assets at end of year (total assets less liabilities)	2015-08-31	$158,827,680
Value of net assets at beginning of year (total assets less liabilities)	2015-08-31	$51,638,496
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2015-08-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2015-08-31	No
Were any leases to which the plan was party in default or uncollectible	2015-08-31	No
Investment advisory and management fees	2015-08-31	$113,920
Value of interest in registered invesment companies (eg mutual funds) at end of year	2015-08-31	$157,502,886
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2015-08-31	$49,390,868
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2015-08-31	$14
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2015-08-31	$-2,460,610
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2015-08-31	Yes
Was there a failure to transmit to the plan any participant contributions	2015-08-31	No
Has the plan failed to provide any benefit when due under the plan	2015-08-31	No
Contributions received in cash from employer	2015-08-31	$1,867,500
Employer contributions (assets) at end of year	2015-08-31	$1,127,000
Employer contributions (assets) at beginning of year	2015-08-31	$2,321,000
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2015-08-31	$1,909,629
Contract administrator fees	2015-08-31	$21,011
Did the plan have assets held for investment	2015-08-31	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	2015-08-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2015-08-31	No
Aggregate proceeds on sale of assets	2015-08-31	$3,932,726
Aggregate carrying amount (costs) on sale of assets	2015-08-31	$3,932,726
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2015-08-31	Yes
Opinion of an independent qualified public accountant for this plan	2015-08-31	Disclaimer
Accountancy firm name	2015-08-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2015-08-31	381357951
2014 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2014 401k financial data
Total unrealized appreciation/depreciation of assets	2014-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2014-12-31	$114,083
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2014-12-31	$41,972
Total income from all sources (including contributions)	2014-12-31	$8,395,535
Total loss/gain on sale of assets	2014-12-31	$0
Total of all expenses incurred	2014-12-31	$9,766,111
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2014-12-31	$9,420,102
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2014-12-31	$4,589,000
Value of total assets at end of year	2014-12-31	$51,752,579
Value of total assets at beginning of year	2014-12-31	$53,051,044
Total of administrative expenses incurred including professional, contract, advisory and management fees	2014-12-31	$346,009
Total interest from all sources	2014-12-31	$0
Total dividends received (eg from common stock, registered investment company shares)	2014-12-31	$1,023,961
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2014-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2014-12-31	$1,023,961
Was this plan covered by a fidelity bond	2014-12-31	Yes
Value of fidelity bond cover	2014-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2014-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2014-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2014-12-31	$40,711
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2014-12-31	$40,358
Administrative expenses (other) incurred	2014-12-31	$149,919
Liabilities. Value of operating payables at end of year	2014-12-31	$114,083
Liabilities. Value of operating payables at beginning of year	2014-12-31	$41,972
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2014-12-31	No
Value of net income/loss	2014-12-31	$-1,370,576
Value of net assets at end of year (total assets less liabilities)	2014-12-31	$51,638,496
Value of net assets at beginning of year (total assets less liabilities)	2014-12-31	$53,009,072
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2014-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2014-12-31	No
Were any leases to which the plan was party in default or uncollectible	2014-12-31	No
Investment advisory and management fees	2014-12-31	$161,143
Value of interest in registered invesment companies (eg mutual funds) at end of year	2014-12-31	$49,390,868
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2014-12-31	$51,442,686
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2014-12-31	$2,782,574
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2014-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2014-12-31	No
Has the plan failed to provide any benefit when due under the plan	2014-12-31	No
Contributions received in cash from employer	2014-12-31	$4,589,000
Employer contributions (assets) at end of year	2014-12-31	$2,321,000
Employer contributions (assets) at beginning of year	2014-12-31	$1,568,000
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2014-12-31	$9,420,102
Contract administrator fees	2014-12-31	$34,947
Did the plan have assets held for investment	2014-12-31	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	2014-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2014-12-31	No
Aggregate proceeds on sale of assets	2014-12-31	$4,283,005
Aggregate carrying amount (costs) on sale of assets	2014-12-31	$4,283,005
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2014-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2014-12-31	Disclaimer
Accountancy firm name	2014-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2014-12-31	381357951
2013 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2013 401k financial data
Total unrealized appreciation/depreciation of assets	2013-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2013-12-31	$41,972
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2013-12-31	$36,518
Total income from all sources (including contributions)	2013-12-31	$11,437,175
Total loss/gain on sale of assets	2013-12-31	$0
Total of all expenses incurred	2013-12-31	$3,070,301
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2013-12-31	$2,734,392
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2013-12-31	$3,215,000
Value of total assets at end of year	2013-12-31	$53,051,044
Value of total assets at beginning of year	2013-12-31	$44,678,716
Total of administrative expenses incurred including professional, contract, advisory and management fees	2013-12-31	$335,909
Total interest from all sources	2013-12-31	$2
Total dividends received (eg from common stock, registered investment company shares)	2013-12-31	$1,002,160
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2013-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2013-12-31	$1,002,160
Was this plan covered by a fidelity bond	2013-12-31	Yes
Value of fidelity bond cover	2013-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2013-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2013-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2013-12-31	$40,358
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2013-12-31	$30,610
Administrative expenses (other) incurred	2013-12-31	$153,412
Liabilities. Value of operating payables at end of year	2013-12-31	$41,972
Liabilities. Value of operating payables at beginning of year	2013-12-31	$36,518
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2013-12-31	No
Value of net income/loss	2013-12-31	$8,366,874
Value of net assets at end of year (total assets less liabilities)	2013-12-31	$53,009,072
Value of net assets at beginning of year (total assets less liabilities)	2013-12-31	$44,642,198
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2013-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2013-12-31	No
Were any leases to which the plan was party in default or uncollectible	2013-12-31	No
Investment advisory and management fees	2013-12-31	$141,441
Value of interest in registered invesment companies (eg mutual funds) at end of year	2013-12-31	$51,442,686
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2013-12-31	$42,198,419
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2013-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2013-12-31	$96,165
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2013-12-31	$96,165
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2013-12-31	$2
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2013-12-31	$7,220,013
Net investment gain or loss from common/collective trusts	2013-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2013-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2013-12-31	No
Has the plan failed to provide any benefit when due under the plan	2013-12-31	No
Contributions received in cash from employer	2013-12-31	$3,215,000
Employer contributions (assets) at end of year	2013-12-31	$1,568,000
Employer contributions (assets) at beginning of year	2013-12-31	$2,353,522
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2013-12-31	$2,734,392
Contract administrator fees	2013-12-31	$41,056
Did the plan have assets held for investment	2013-12-31	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	2013-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2013-12-31	No
Aggregate proceeds on sale of assets	2013-12-31	$4,221,037
Aggregate carrying amount (costs) on sale of assets	2013-12-31	$4,221,037
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2013-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2013-12-31	Disclaimer
Accountancy firm name	2013-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2013-12-31	381357951
2012 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2012 401k financial data
Total unrealized appreciation/depreciation of assets	2012-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2012-12-31	$36,518
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2012-12-31	$60,438
Total income from all sources (including contributions)	2012-12-31	$8,903,389
Total loss/gain on sale of assets	2012-12-31	$0
Total of all expenses incurred	2012-12-31	$2,860,643
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2012-12-31	$2,491,863
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2012-12-31	$3,871,522
Value of total assets at end of year	2012-12-31	$44,678,716
Value of total assets at beginning of year	2012-12-31	$38,659,890
Total of administrative expenses incurred including professional, contract, advisory and management fees	2012-12-31	$368,780
Total interest from all sources	2012-12-31	$402
Total dividends received (eg from common stock, registered investment company shares)	2012-12-31	$453,577
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2012-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2012-12-31	$453,577
Administrative expenses professional fees incurred	2012-12-31	$250,126
Was this plan covered by a fidelity bond	2012-12-31	Yes
Value of fidelity bond cover	2012-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2012-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2012-12-31	No
Value of other receiveables (less allowance for doubtful accounts) at end of year	2012-12-31	$30,610
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2012-12-31	$0
Administrative expenses (other) incurred	2012-12-31	$83,360
Liabilities. Value of operating payables at end of year	2012-12-31	$36,518
Liabilities. Value of operating payables at beginning of year	2012-12-31	$60,438
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2012-12-31	No
Value of net income/loss	2012-12-31	$6,042,746
Value of net assets at end of year (total assets less liabilities)	2012-12-31	$44,642,198
Value of net assets at beginning of year (total assets less liabilities)	2012-12-31	$38,599,452
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2012-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2012-12-31	No
Were any leases to which the plan was party in default or uncollectible	2012-12-31	No
Investment advisory and management fees	2012-12-31	$14,893
Value of interest in registered invesment companies (eg mutual funds) at end of year	2012-12-31	$42,198,419
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2012-12-31	$0
Value of interest in common/collective trusts at end of year	2012-12-31	$0
Value of interest in common/collective trusts at beginning of year	2012-12-31	$36,981,890
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2012-12-31	$96,165
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2012-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2012-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2012-12-31	$402
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2012-12-31	$926,693
Net investment gain or loss from common/collective trusts	2012-12-31	$3,651,195
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2012-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2012-12-31	No
Has the plan failed to provide any benefit when due under the plan	2012-12-31	No
Contributions received in cash from employer	2012-12-31	$3,871,522
Employer contributions (assets) at end of year	2012-12-31	$2,353,522
Employer contributions (assets) at beginning of year	2012-12-31	$1,678,000
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2012-12-31	$2,491,863
Contract administrator fees	2012-12-31	$20,401
Did the plan have assets held for investment	2012-12-31	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	2012-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2012-12-31	No
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2012-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2012-12-31	Disclaimer
Accountancy firm name	2012-12-31	PLANTE & MORAN, PLLC
Accountancy firm EIN	2012-12-31	381357951
2011 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2011 401k financial data
Total unrealized appreciation/depreciation of assets	2011-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2011-12-31	$60,438
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2011-12-31	$53,459
Total income from all sources (including contributions)	2011-12-31	$3,818,144
Total loss/gain on sale of assets	2011-12-31	$0
Total of all expenses incurred	2011-12-31	$2,608,633
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2011-12-31	$2,313,783
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2011-12-31	$3,580,000
Value of total assets at end of year	2011-12-31	$38,659,890
Value of total assets at beginning of year	2011-12-31	$37,443,400
Total of administrative expenses incurred including professional, contract, advisory and management fees	2011-12-31	$294,850
Total interest from all sources	2011-12-31	$0
Total dividends received (eg from common stock, registered investment company shares)	2011-12-31	$0
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2011-12-31	No
Was this plan covered by a fidelity bond	2011-12-31	Yes
Value of fidelity bond cover	2011-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2011-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2011-12-31	No
Administrative expenses (other) incurred	2011-12-31	$294,850
Liabilities. Value of operating payables at end of year	2011-12-31	$60,438
Liabilities. Value of operating payables at beginning of year	2011-12-31	$53,459
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2011-12-31	No
Value of net income/loss	2011-12-31	$1,209,511
Value of net assets at end of year (total assets less liabilities)	2011-12-31	$38,599,452
Value of net assets at beginning of year (total assets less liabilities)	2011-12-31	$37,389,941
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2011-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2011-12-31	No
Were any leases to which the plan was party in default or uncollectible	2011-12-31	No
Value of interest in common/collective trusts at end of year	2011-12-31	$36,981,890
Value of interest in common/collective trusts at beginning of year	2011-12-31	$32,938,400
Net investment gain or loss from common/collective trusts	2011-12-31	$238,144
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2011-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2011-12-31	No
Has the plan failed to provide any benefit when due under the plan	2011-12-31	No
Contributions received in cash from employer	2011-12-31	$3,580,000
Employer contributions (assets) at end of year	2011-12-31	$1,678,000
Employer contributions (assets) at beginning of year	2011-12-31	$4,505,000
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2011-12-31	$2,313,783
Did the plan have assets held for investment	2011-12-31	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	2011-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2011-12-31	No
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2011-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2011-12-31	Disclaimer
Accountancy firm name	2011-12-31	DELOITTE & TOUCHE LLP
Accountancy firm EIN	2011-12-31	133891517
2010 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2010 401k financial data
Total unrealized appreciation/depreciation of assets	2010-12-31	$0
Total transfer of assets from this plan	2010-12-31	$93,549
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2010-12-31	$53,459
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2010-12-31	$50,122
Total income from all sources (including contributions)	2010-12-31	$9,214,995
Total loss/gain on sale of assets	2010-12-31	$0
Total of all expenses incurred	2010-12-31	$2,326,764
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2010-12-31	$2,122,159
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2010-12-31	$5,027,000
Value of total assets at end of year	2010-12-31	$37,443,400
Value of total assets at beginning of year	2010-12-31	$30,645,381
Total of administrative expenses incurred including professional, contract, advisory and management fees	2010-12-31	$204,605
Total interest from all sources	2010-12-31	$0
Total dividends received (eg from common stock, registered investment company shares)	2010-12-31	$0
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2010-12-31	No
Was this plan covered by a fidelity bond	2010-12-31	Yes
Value of fidelity bond cover	2010-12-31	$5,000,000
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2010-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2010-12-31	No
Administrative expenses (other) incurred	2010-12-31	$204,605
Liabilities. Value of operating payables at end of year	2010-12-31	$53,459
Liabilities. Value of operating payables at beginning of year	2010-12-31	$50,122
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2010-12-31	No
Value of net income/loss	2010-12-31	$6,888,231
Value of net assets at end of year (total assets less liabilities)	2010-12-31	$37,389,941
Value of net assets at beginning of year (total assets less liabilities)	2010-12-31	$30,595,259
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2010-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2010-12-31	No
Were any leases to which the plan was party in default or uncollectible	2010-12-31	No
Value of interest in common/collective trusts at end of year	2010-12-31	$32,938,400
Value of interest in common/collective trusts at beginning of year	2010-12-31	$30,645,381
Net investment gain or loss from common/collective trusts	2010-12-31	$4,187,995
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2010-12-31	Yes
Was there a failure to transmit to the plan any participant contributions	2010-12-31	No
Has the plan failed to provide any benefit when due under the plan	2010-12-31	No
Contributions received in cash from employer	2010-12-31	$5,027,000
Employer contributions (assets) at end of year	2010-12-31	$4,505,000
Employer contributions (assets) at beginning of year	2010-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2010-12-31	$2,122,159
Did the plan have assets held for investment	2010-12-31	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	2010-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2010-12-31	No
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2010-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2010-12-31	Disclaimer
Accountancy firm name	2010-12-31	DELOITTE & TOUCHE LLP
Accountancy firm EIN	2010-12-31	133891517
2009 : CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2009 401k financial data
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2009-12-31	$0

Form 5500 Responses for CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN

2017: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2017 form 5500 responses
2017-09-01	Type of plan entity	Single employer plan
2017-09-01	Submission has been amended	No
2017-09-01	This submission is the final filing	Yes
2017-09-01	This return/report is a short plan year return/report (less than 12 months)	Yes
2017-09-01	Plan is a collectively bargained plan	No
2017-09-01	Plan funding arrangement – Trust	Yes
2017-09-01	Plan benefit arrangement - Trust	Yes
2016: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2016 form 5500 responses
2016-09-01	Type of plan entity	Single employer plan
2016-09-01	Submission has been amended	No
2016-09-01	This submission is the final filing	No
2016-09-01	This return/report is a short plan year return/report (less than 12 months)	No
2016-09-01	Plan is a collectively bargained plan	No
2016-09-01	Plan funding arrangement – Trust	Yes
2016-09-01	Plan benefit arrangement - Trust	Yes
2015: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2015 form 5500 responses
2015-09-01	Type of plan entity	Single employer plan
2015-09-01	Submission has been amended	No
2015-09-01	This submission is the final filing	No
2015-09-01	This return/report is a short plan year return/report (less than 12 months)	No
2015-09-01	Plan is a collectively bargained plan	No
2015-09-01	Plan funding arrangement – Trust	Yes
2015-09-01	Plan benefit arrangement - Trust	Yes
2015-01-01	Type of plan entity	Single employer plan
2015-01-01	Submission has been amended	No
2015-01-01	This submission is the final filing	No
2015-01-01	This return/report is a short plan year return/report (less than 12 months)	Yes
2015-01-01	Plan is a collectively bargained plan	No
2015-01-01	Plan funding arrangement – Trust	Yes
2015-01-01	Plan benefit arrangement - Trust	Yes
2014: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2014 form 5500 responses
2014-01-01	Type of plan entity	Single employer plan
2014-01-01	Submission has been amended	No
2014-01-01	This submission is the final filing	No
2014-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2014-01-01	Plan is a collectively bargained plan	No
2014-01-01	Plan funding arrangement – Trust	Yes
2014-01-01	Plan benefit arrangement - Trust	Yes
2013: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2013 form 5500 responses
2013-01-01	Type of plan entity	Single employer plan
2013-01-01	Submission has been amended	No
2013-01-01	This submission is the final filing	No
2013-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2013-01-01	Plan is a collectively bargained plan	No
2013-01-01	Plan funding arrangement – Trust	Yes
2013-01-01	Plan benefit arrangement - Trust	Yes
2012: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2012 form 5500 responses
2012-01-01	Type of plan entity	Single employer plan
2012-01-01	Submission has been amended	No
2012-01-01	This submission is the final filing	No
2012-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2012-01-01	Plan is a collectively bargained plan	No
2012-01-01	Plan funding arrangement – Trust	Yes
2012-01-01	Plan benefit arrangement - Trust	Yes
2011: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2011 form 5500 responses
2011-01-01	Type of plan entity	Single employer plan
2011-01-01	Submission has been amended	Yes
2011-01-01	This submission is the final filing	No
2011-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2011-01-01	Plan is a collectively bargained plan	No
2011-01-01	Plan funding arrangement – Trust	Yes
2011-01-01	Plan benefit arrangement - Trust	Yes
2010: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2010 form 5500 responses
2010-01-01	Type of plan entity	Single employer plan
2010-01-01	Submission has been amended	No
2010-01-01	This submission is the final filing	No
2010-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2010-01-01	Plan is a collectively bargained plan	No
2010-01-01	Plan funding arrangement – Trust	Yes
2010-01-01	Plan benefit arrangement - Trust	Yes
2009: CENTURY ALUMINUM EMPLOYEES RETIREMENT PLAN 2009 form 5500 responses
2009-01-01	Type of plan entity	Single employer plan
2009-01-01	Submission has been amended	No
2009-01-01	This submission is the final filing	No
2009-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2009-01-01	Plan is a collectively bargained plan	No
2009-01-01	Plan funding arrangement – Trust	Yes
2009-01-01	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