When a single developer releases multiple apps, do they register the apps under different company names? What's the most iPhone apps released by a single developer that you know of?
During your submission of the first app in app store, you have to enter your company name. It can be different from the name which is used to create the developer account. Once created, you can not change this company name, that is any future app from that developer account will have that company name.
This was the scenario at least at the start of this year. I don't know whether this policy is changed now (little possibility of changing).
I have at least 200+ apps in the store. Admittedly, most developers would refer to them as Shovelware. However, that is not my intent, and I go to great lengths to prevent that. As far as I know, Apple doesn't have a limit on the number of apps. Note though, that the latest Apple App Approval changes have a clause about developers spamming the store with similar apps. The practice is frowned upon. Also, all of our apps are under one company name.
Hope that helps.