6. GT Solar International ( SOLR) provides polysilicon production equipment and sapphire and silicon crystalline growth systems and materials for the solar, LED and other specialty markets. For third quarter of 2011, the company reported 51% increase in revenue to $263 million from $173.6 million in 2010 third quarter. Gross profit for the quarter came in at $122.1 million, up from $76.7 million reported in the year-ago quarter. Operating margin was 36.1%, compared to 33.2% in 2010 third quarter. Net income rose 73% to $63.6 million from $36.8 million during the same quarter last year. Actual sales were 40% higher than analysts' estimates, while actual earnings per share were 135% higher at $0.47 per share. Based on the company's guidance for fiscal 2011, revenue is expected to range between $835 million and $860 million, higher than the earlier guided range of $775 million-$850 million. The stock has analysts' buy ratings of 75% and is expected to deliver 30% return in the next one year. The stock is trading at 8.9 times its estimated 2011 earnings.