Piper Jaffray Downgrades Altera, Cites Valuation By: Benzinga via Benzinga April 22, 2015 at 11:51 AM EDT Piper Jaffray on Wednesday issued a note on Altera Corporation (NASDAQ: ALTR), downgrading the company from Overweight to Neutral. Piper ... Read More >> Related Stocks: Altera Corp