I apologize if it is not clear, but all the foundations of the companies came from earth, but became their current incarnations after the collapse, isolating them from Earth, leading them to form their own conglomerate. Daedalus was an attempt to get cheap real estate to expand their research and production facilities. Byzantium was formed when a bunch of stranded national militaries decided to pool their resources together rather than fight each other. Alhambra banking was an attempt to bring banking to the other side of the gate before the collapse, and latching on to military conglomerate, mangaed to ride out the worst of the collapse.