FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Gary Jesse E 		2. Issuer Name and Ticker or Trading Symbol

CENTURY ALUMINUM CO [ CENX ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
EVP, Gen. Counsel & Secretary
(Last)          (First)          (Middle)

C/O CENTURY ALUMINUM COMPANY, ONE SOUTH WACKER DRIVE, SUITE 1000 		3. Date of Earliest Transaction (MM/DD/YYYY)

12/31/2017
(Street)

CHICAGO, IL 60606
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   12/31/2017     F    5146   (1) D $19.64   90841   (2) D    
Common Stock   1/2/2018     A    20622   (3) A $0   111463   (4) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of performance share units granted to the Reporting Person.
(2)  Includes unvested time vesting performance share units granted to the Reporting Person pursuant to Issuer's 2016-2018 and 2017-2019 Long-Term Incentive Plans under Rule 16b-3(d).
(3)  Represents time vesting performance share units granted to the Reporting Person in connection with the Issuer's 2018-2020 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2020.
(4)  Includes unvested performance share units granted to the Reporting Person pursuant to Issuer's 2016-2018, 2017-2019 and 2018-2020 Performance Share Programs under a Rule 16b-3(d) plan.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Gary Jesse E
C/O CENTURY ALUMINUM COMPANY
ONE SOUTH WACKER DRIVE, SUITE 1000
CHICAGO, IL 60606

EVP, Gen. Counsel & Secretary

Signatures
/s/ Jesse E. Gary 1/3/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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