Benzinga's Top Downgrades By: Benzinga via Benzinga December 29, 2014 at 09:40 AM EST Analysts at Needham downgraded Ambarella, Inc. (NASDAQ: AMBA) from Hold to Underperform. Ambarella's shares closed at $55.94 on ... Read More >> Related Stocks: Ambarella Inc Cavium, Inc. - Common Stock