Benzinga's Top #PreMarket Losers

GT Advanced Technologies GTAT dropped 8.26% to $17.88 in pre-market trading. Canaccord Genuity downgrades GT Advanced from Buy to Hold. Central European Media Enterprises CETV shares declined 3.18% to $2.74 in pre-market trading after falling 0.35% on Thursday. Arena Pharmaceuticals ARNA fell 2.57% to $5.69 in pre-market trading after rising 0.17% on Thursday. Tower Semiconductor TSEM dipped 1.35% to $9.53 in pre-market trading after surging 4.21% on Thursday.