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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
949157	Century Aluminum Co	CENX	Primary Production Of Aluminum (3334)	133070826

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1365895	Michelle Harrison	C/O Century Aluminum Company One South Wacker Drive, Suite 1000 Chicago IL 60606	Sr. Vp Finance & Treasurer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2018-06-07	14,398	$6.55	65,402	No	4	M	Direct
Common Stock	Disposition	2018-06-07	14,398	$17.39	51,004	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Acquisiton	2018-06-07	14,398	$0.00	14,398	$6.55

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2010-05-04	2019-05-04	No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	353	Indirect	By 401(k) plan

Footnotes

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.
This transaction was executed in multiple trades at prices ranging from $17.11 to $17.65. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
As reported by 401(k) plan trustee on March 31, 2018