Shares of GT Advanced Technologies (GTAT) fell Friday after the Apple (AAPL) supplier said it planned to leave the business of sapphire manufacturing, according to court documents.

The diversified technology company says certain documents must be filed under seal to avoid triggering large claims for breaching confidentiality agreements.

Shares of GT Advanced Technologies (GTAT) fell Thursday after Apple's (AAPL) sapphire supplier said it wanted to keep details of problems between the companies secret from the public.

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