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 *

Ryfold Ltd 		2. Issuer Name and Ticker or Trading Symbol

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

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O ESTERA TRUST (JERSEY) LIMITED,, 13-14 ESPLANADE 		3. Date of Earliest Transaction (MM/DD/YYYY)

9/14/2017
(Street)

ST HELIER, Y9 JE1 1EE
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

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

___ Form filed by One Reporting Person
_ X _ 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

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
Call Option (obligation to sell)   $100   (1) 9/14/2017     J   (1)    1       9/14/2017   (1) 9/14/2027   (1) Common Stock   27500000   (1) $100   (1) 1   D   (2)  

Explanation of Responses:
(1)  On the September 14, 2017, Glencore AG and Ryfold Limited ("Ryfold") entered into a Call Option Agreement (the "Givolon Call Option Agreement") pursuant to which Glencore AG acquired an American-style call option that gives Glencore AG the right to purchase from Ryfold, at any time prior to the expiration thereof, 100% of the equity interests in Givolon Limited, a wholly-owned subsidiary of Ryfold ("Givolon"), for an aggregate exercise price of $100 (the "Givolon Call Option"). The Givolon Call Option will expire on September 14, 2027. Glencore AG paid Ryfold an aggregate premium of $100 for the Givolon Call Option.
(2)  Ryfold's interest in the Call Option is held indirectly by each of Ryfold's parent, The Ryfold Trust, and Estera Trust (Jersey) Limited ("Estera") solely in its capacity as trustee of The Ryfold Trust. Givolon holds directly a number of shares of Common Stock equal to the number of shares reported on Table II, which shares are indirectly owned by each of Ryfold, Ryfold's parent, The Ryfold Trust, and Estera solely in its capacity as trustee of The Ryfold Trust. Estera does not have and disclaims any pecuniary interest in such Common Stock and in the Call Option reported on Table II.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Ryfold Ltd
C/O ESTERA TRUST (JERSEY) LIMITED,
13-14 ESPLANADE
ST HELIER, Y9 JE1 1EE
X

Estera Trust (Jersey) Ltd
C/O ESTERA TRUST (JERSEY) LIMITED,
13-14 ESPLANADE
ST HELIER, Y9 JE1 1EE
X

Ryfold Trust
C/O ESTERA TRUST (JERSEY) LIMITED,
13-14 ESPLANADE
ST HELIER, Y9 JE1 1EE
X


Signatures
RYFOLD LIMITED By: /s/ Brendan Dowling, Director 9/14/2017
** Signature of Reporting Person Date

ESTERA TRUST (JERSEY) LIMITED By: /s/ Brendan Dowling, Director 9/14/2017
** Signature of Reporting Person Date

ESTERA TRUST (JERSEY) LIMITED, in its capacity as trustee of THE RYFOLD TRUST By: /s/ Brendan Dowling, Director 9/14/2017
** 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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