Benzinga's Top Downgrades By: Benzinga via Benzinga December 03, 2015 at 09:21 AM EST B. Riley downgraded Mattson Technology, Inc. (NASDAQ: MTSN) from Buy to Neutral. Mattson shares closed at $3.60 on Wednesday. ... Read More >> Related Stocks: American Campus Communities Inc American Eagle Outfitters Endeavor Group Holdings Inc Cl A PerkinElmer TravelersCompanies Unum Group Verint Systems Inc Weatherford International Ltd Zafgen Inc