Proto Labs (NYSE:PRLB – Get Free Report) was upgraded by Zacks Research from a “hold” rating to a “strong-buy” rating in a research report issued to clients and investors on Thursday,Zacks.com reports. Wall Street Zen cut Proto Labs from a “strong-buy” rating to a “buy” rating in a research note on Saturday, July 18th. Get Proto Labs alerts:View Our Latest Research Report on PRLBProto Labs Stock Up 1.2%PRLB opened at $88.92 on Thursday. Proto Labs Company Profile(Get Free Report)Proto Labs, Inc is a digital manufacturing company that offers on-demand production services for custom parts and prototypes. Recommended StoriesReceive News & Ratings for Proto Labs Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for Proto Labs and related companies with MarketBeat.com's FREE daily email newsletter.