The shares of aluminum stock Alcoa Corp (NYSE:AA) are sliding today, after UBS initiated coverage with a "sell" rating and 29pricetarget,thoughBMOthrewinaprice−targethiketo30 from 28.Thisattentioncomesaheadofthecompany′sfourth−quarterearningsreport,dueoutaftertheclosetomorrow,Jan.17. Atlastglance,AAwasdown3.828.88, and crossing below the $30 level, which provided support since mid December. The stock's 50-day moving average appears to be containing today's pullbac ...