Vitreous

Vitreous, also known as Vitreous Glass Masters, is a company featured in Grand Theft Auto V.

Description
The company is likely specialized in container glass products. It owns a large processing unit, located at the intersection of Orchardville Avenue and El Rancho Boulevard in Cypress Flats, Los Santos, named "Los Santos Plant #1".

Its slogan is "Real glass men with union pride". Workers of the company can be frequently seen outside the factory during daytime.

Influence
Vitreous is probably based on Owens-Illinois, a public company that specializes in glass products. The processing building in Cypress Flats is also modeled after the Owens-Illinois plant located on 2901 Fruitland Avenue in Vernon, California.