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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Kjos David   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) VP Maj Proj. Tech. & Sustain (Last) (First) (Middle) CENTURY ALUMINUM COMPANY, 2511 GARDEN ROAD, BLDG A, SUITE 200 3. Date of Earliest Transaction (Month/Day/Year) 03/19/2013 (Street) MONTEREY, CA 93940 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 03/19/2013   A   5,523 (1) A (1) 148,311 (2) D   Common Stock 03/19/2013   A   6,412 (3) A (3) 154,723 (4) D   Common Stock               868.7973 (5) I By 401(k) plan

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kjos David CENTURY ALUMINUM COMPANY 2511 GARDEN ROAD, BLDG A, SUITE 200 MONTEREY, CA 93940			VP Maj Proj. Tech. & Sustain

Signatures

Michael A. Serafini, Attorney-in-Fact for David Kjos		03/21/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted pursuant to the Issuer's 2012-2014 Performance Share Program ("2012-2014 Plan Period ") under a Rule 16b-3(d) plan, all of which vest in the ordinary course on the last day of the 2012-2014 Plan Period, December 31, 2014.
(2)	Includes vested performance share units granted to the Reporting Person pursuant to the Issuer's 2011-2013 and 2011-2014 Performance Share Programs, 3,801 of which will settle on December 31, 2013, and 3,500 of which will settle on each of March 22, 2013 and March 22, 2014, respectively; and unvested performance share units granted to the Reporting Person pursuant to the Issuer's 2012-2014 Performance Share Program, all of which will vest on December 31, 2014, all under a Rule 16b-3(d) plan.
(3)	Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted pursuant to the Issuer's 2013-2015 Performance Share Program ("Plan Period ") under a Rule 16b-3(d) plan, all of which vest in the ordinary course on the last day of the Plan Period, December 31, 2015.
(4)	Includes vested performance share units granted to the Reporting Person pursuant to the Issuer's 2011-2013 and 2011-2014 Performance Share Programs, 3,801 of which will settle on December 31, 2013, and 3,500 of which will settle on each of March 22, 2013 and March 22, 2014, respectively; and unvested performance share units granted to the Reporting Person pursuant to the Issuer's 2012-2014 and 2013-2015 Performance Share Programs, all of which will vest on December 31, 2014 and December 31, 2015, respectively, all under a Rule 16b-3(d) plan.
(5)	As reported by 401(k) plan trustee on March 19, 2013.

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