Tech ratings changes: GT Advanced, JA Solar, Polycom, AppliedMicro

|About: GT Advanced Technologies, Inc. (GTATQ)|By:, SA News Editor

GT Advanced (GTAT +4.8%) has been upgraded to Outperform by Credit Suisse, and is making new 52-week highs. Goldman started shares at Buy on Tuesday.

JA Solar (JASO +2.6%) has been started at Buy by Sidoti. The company was one of several Chinese solar names to post big gains yesterday.

Polycom (PLCM +3.3%) has been upgraded to Buy by Citi.

AppliedMicro (AMCC +1.1%) has been started at Buy by Roth.

Quality Systems (QSII +3.6%) has been upgraded to Market Perform by FBR.

Imagination (IGNMF) has been cut to Sell by Canaccord. Shares are down 1.7% in London.