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NEW YORK (TheStreet) -- Shares of GT Advanced Technologies Inc. (GTAT) are falling by 8.30% to $13.70 in pre-market trading on Wednesday, one day after Apple (AAPL) - Get Apple Inc. Report announced the new iPhone 6 and iPhone 6 Plus will not feature screens made with the company's sapphire glass, Reuters reports.

Additionally, GT Advanced Technologies was downgraded to "neutral" from "buy," and its price target was cut to $14 from $20 at Goldman Sachs (GS) - Get Goldman Sachs Group, Inc. Report .

Piper Jaffray (PJC) - Get Piper Jaffray Companies Report also downgraded GT Advanced to "neutral" from "overweight" with a $16 price target, down from $23.STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.

GTAT data by YCharts

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