(Bloomberg) -- A softening of the U.S. government's stance on Russian sanctions is bringing Alcoa Corp.'s best rally in years to a screeching halt.
Shares in the largest U.S. aluminum producer headed for the biggest slump in nine years as prices of the refined metal tumbled in London after the U.S. opened the door to relief from sanctions on United Co. Rusal, easing supply concerns. Century Aluminum Co. and Kaiser Aluminum Corp. also declined.
Last week, aluminum climbed to the highest in almost seven years as the curbs on Rusal, the top supplier outside China, set off a rush for alternative supplies. Concerns are now fading after the U.S. Treasury said it would provide sanctions relief if billionaire Oleg Deripaska relinquished control of the Russian producer. The U.S. also extended the deadline for companies to wind down dealings with Rusal.
“If that is the case, all the supply issues that people were worried about over the last week just disappear,” Ryan McKay, a commodity strategist at TD Securities in Toronto, said in a telephone interview. “Without the sanctions, it's a pretty well-supplied market.”
Alcoa tumbled 13 percent to $52.51 at 10:38 a.m. in New York, poised for the biggest loss since March 2009. The Pittsburgh-based company's stock touched $62.35 on April 19, the highest since 2008.
Chicago-based Century slipped 4.4 percent, while Kaiser, based in Foothill Ranch, California, slipped 1 percent.
Representatives at Alcoa didn't immediately respond to phone calls and emails seeking comment. A Century spokesman declined to comment.
On the London Metal Exchange, aluminum for delivery in three months dropped as much as 9.4 percent to $2,237 a metric ton.
--With assistance from Joe Deaux
To contact the reporter on this story: Luzi Ann Javier in New York at ljavier@bloomberg.net.
To contact the editors responsible for this story: James Attwood at jattwood3@bloomberg.net, Joe Richter
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