They just are, okay?
Longer version: Just like you, me and everyone except John Malkovich, each company is a single legal entity.
Fixation Video, frinstance, exists as a single thing. Currently it relies on Susi Weaser and me to support it, but as an entity it’s out there, making it on its own. One day it will be bigger than the both of us and may even turn against us. Hard to believe, but true.