GT Advanced -3.5% on 2-notch CLSA downgrade

• CLSA has downgraded GT Advanced (GTAT) to Underperform from Outperform.
• The downgrade comes a month after CLSA lowered its estimates for GT, citing potentially low sapphire yields at the company's Mesa, AZ facility. It also arrives with shares up 111% YTD amid strong Apple-related hopes.
• Previous: GT Advanced gains on iPhone screen production report