Insiders sell for a variety of reasons, many of them mundane. However, they only buy for one reason: They believe shares will swing higher in value. With that principle in mind, infrastructure software specialist Appian (NASDAQ:APPN) appears to be a compelling opportunity. Not only did a major investor place a big bet on APPN stock, it appears fundamentally undervalued.According to its public profile, Appian provides a low-code design platform, encompassing artificial intelligence, process automation, data ...