Each company is commanded by a Major with a senior1) Captain as his second in command. The basis of the company is the four person fire team, commonly called a brick.
Each brick can operate independently if it has to for a short period of time. Every brick has an officer or NCO in it plus junior NCO as the second in command of the brick.
There are 23 bricks in a Heavy Mobility Armour (HMA) Infantry Company. This gives 92 effective soldiers. Organisationally these are structured as follows:
The remaining two platoons are structured in the same way as the first platoon. On the company net each platoon is distinguished by a colour or letter in front of their numerical call sign. The practice varies from company to company and on active operations the companies may well change their comms designation on a frequent and regular basis.