From what I can tell there isn't any company wide rules. In my building there are directors who sit out in the open, some who have private offices.
Some non manager software engineers share offices with one or two people, and some managers share an office with someone.
Sounds like if an employee really really wants an office, they can be eligible to share one, but it's not the norm. It's actually pretty quiet though in the "cubes" since there are so many meeting rooms to pop into for discussions.
I found this even weirder, frankly. Everyone is sitting out there in the open, but it's impolite to talk, and most people have headphones on. Strange vibe to be in a giant room full of people that is basically silent, IMO.
I don't think I ever saw one. The director of the product I worked on (comprising a few hundred people spread across a few offices and countries) sat a few "pods" over from me for awhile. He did have priority use of a 1:1 meeting room though.
