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 * Nielsen Robert R   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) Executive Vice President (Last) (First) (Middle) CENTURY ALUMINUM COMPANY, 2511 GARDEN ROAD, BLDG. A, SUITE 200 3. Date of Earliest Transaction (Month/Day/Year) 12/16/2009 (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 12/16/2009   S   42,767 A $ 14.12 (1) 2,460 (2) D   Common Stock               176.4855 (3) I 401(k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
Nielsen Robert R CENTURY ALUMINUM COMPANY 2511 GARDEN ROAD, BLDG. A, SUITE 200 MONTEREY, CA 93940			Executive Vice President

Signatures

William J. Leatherberry, Attorney-in-Fact for Robert R. Nielsen		12/17/2009
**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 the average sale price of 42,767 shares in multiple transactions at prices ranging from $14.0884 to $14.17, resulting in a weighted average sale price of $14.12. Upon the request of the Securities and Exchange Commission (SEC), the Reporting Person will provide the SEC with full information regarding the number of shares and prices at which the transactions were effected.
(2)	Includes unvested shares of performance share units granted to the Reporting Person in connection with the Issuer's 2008-2010 Performance Program Period under a Rule 16b-3(d) plan, all of which vest in the ordinary course on December 31, 2010, or earlier, upon the Reporting Person's termination of employment with the Issuer and its subsidiaries due to death, disability, termination other than for cause or other reason approved by the Compensation Committee of the Issuer's Board of Directors.
(3)	Reported by 401(k) plan trustee on December 15, 2009.

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