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UBS is downgrading Rubicon Technology (RBCN -8%), whose sapphire wafers are used to make LED...

UBS is downgrading Rubicon Technology (RBCN -8%), whose sapphire wafers are used to make LED chips, following a Q3 report that featured very weak Q4 guidance. UBS is worried about a slower-than-expected ramp of Rubicon's 6" wafers, which carry much higher prices than its smaller wafers. (earlier)
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