MAPLE PLAIN, Minn.--(BUSINESS WIRE)--Proto Labs, Inc. (NYSE:PRLB) has been named to Fortune Magazine’s 2015 100 Fastest-Growing Companies List, the magazine’s annual compilation of public companies with the best three-year profit, revenue and stock growth. A global, rapid manufacturer of custom prototypes and low-volume production parts, Proto Labs ranks 75th on Fortune’s list, and is the only Minnesota company to make the cut. Proto Labs joins Facebook as first-timers to the rankings. This was