CENTURY ALUM CO

Ticker: CENX CUSIP: 156431108 Class: EQTY

Robeco Institutional Asset Management B.V.'s Holding History (CIK: 0001418773)

Note: Option positions (PUT/CALL) are excluded.

Q1 2015

Shares 88,906 Value ($000) $1,226 Avg Close $20.13 Range $12.87 - $26.97

Q4 2014

Shares 88,906 Value ($000) $2,169 Avg Close $25.81 Range $20.79 - $31.75

Q3 2014

Shares 76,545 Value ($000) $1,987 Avg Close $22.02 Range $15.77 - $29.54

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	88,906	$1,226	$20.13	$12.87 - $26.97
Q4 2014	88,906	$2,169	$25.81	$20.79 - $31.75
Q3 2014	76,545	$1,987	$22.02	$15.77 - $29.54