The top eight megacorps in the Solar System make up a group known by everyone as The Pantheon. The sheer number of employees, military power, political pull they have make them them powerful enough to make up the Big Three of the Eclipsed Horizon universe. Though each one would like no more than to be the top company around, they at least have the sense not to wage full scale war if it can be avoided. People can't buy their products if they're all dead now can they?