The United Corporate Authority
The UCA was originally formed by three dominant megacorporations (Andra Biomechanics, Armacham Technology Corporation, and Shogo Industries). Originally intended as a joint venture that would ensure the continued profitability of the three organizations that founded it, the UCA is now independent, and the dominant military power in existence.

Shogo Industries
A Japanese conglomerate, Shogo has interests ranging from technology to publishing to the manufacture of children's clothing. With the advent of MEVs and MCAs, Shogo decided to offer their own highly advanced line of giant mechanized suits.

Andra Biomechanics
Andra Biomechanics specializes in a variety of genetic engineering, cybernetic, and mechanical engineering interests, including the development of MCAs and armaments.

Armacham
Armacham Technology Corporation got its start with the manufacture of commercial satellites and ground-based communication systems. Eventually, they would expand to encompass civilian and military vehicle manufacture, musical equipment, security systems, and, predictably enough, MEV and MCA technologies.

The CMC
The Cronian Mining Consortium (CMC) is the governing body on Cronus.  The CMC has long been eager for autonomy from the UCA and various corporate interests. The importance of Kato energy gives the CMC a powerful bargaining chip offset only by Cronus' military insignificance.

The Fallen
The Fallen, a fanatical terrorist group lead by a mysterious leader known only as Gabriel, threatens the balance of power on Cronus, and ultimately, control of Kato.