Dublin, Ireland-based Allegion plc (ALLE) is a global security products and solutions company specializing in mechanical and electronic access control systems. The company commands a market cap of $13.8 billion, and its portfolio includes door hardware, locks, exit devices, and smart access solutions sold under well-known brands such as Schlage, Von Duprin, and LCN. Companies worth $10 billion or more are generally described as "large-cap stocks." Allegion fits right into that category, reflecting its si ...