Allegion plc is a security-products company built around door openings, access control, and related hardware for commercial, institutional, and residential buildings. Its portfolio includes mechanical and electronic locks, exit devices, door closers, access technologies, and portable security products sold under brands such as Schlage, Von Duprin, LCN, CISA, Interflex, and SimonsVoss. The company sells primarily through distribution, retail, e-commerce, and specialty channel partners, with some direct-to-end-user activity in selected businesses. Its business is tied to construction, remodeling, and retrofit activity, but it also benefits from the shift toward connected and mobile-enabled security solutions. Allegion was formed from the separation of Ingersoll Rand's security businesses and has a long brand heritage, with several products originating category-defining patents more than a century ago.