Century Aluminum is trading 4.14% down at $35.85, as broader materials-sector weakness and macro pressures weigh on shares; no company-specific catalyst has surfaced. - The materials sector is down 1.55%, with rising yields, oil-price volatility and growth concerns weighing on stocks. - Shares closed down 2.58% at $37.40 on September 28, extending their recent decline. Available reporting does not establish a direct cause for today’s move beyond sector and macro pressure.