Ultor
The Ultor Corporation is the mining company you rebel against in Red Faction and the name of the company which is formed in Red Faction II. It is unknown whether Ultor plays a part in Red Faction: Guerrilla or not. The Ultor symbol has been spotted on propaganda in Red Faction: Guerrilla, and the Nano Rifle features an Ultor symbol.
In Volition's Saints Row 2, Ultor owns the city of Stilwater.