A company was a ground infantry unit. In the Grand Army of the Galactic Republic, each regiment consisted of sixteen companies of 144 clone troopers led by their respective Clone Captains, with each divided into four platoons. In the Stormtrooper Corps, a company consisted of four platoons, giving one a total of 200 stormtroopers. A battalion consisted of four Imperial companies.
Clone Captain Rex commanded the 501st Legion's Torrent Company and 332nd Company during the Clone Wars. Other Grand Army companies included the 212th Attack Battalion's Ghost Company, the 41st Elite Corps' Green Company, and Tango Company.
The Alliance Army also used companies as infantry units, such as Twilight Company, though their numbers were less standardized.