I am guessing it has more to do with your role at the company, than the type of the company itself. Take this for example: one might say that a company that focuses heavily on "brick and mortar" retail would be less likely to demand IP ownership than, say, Google. But I'd bet that it's more like this: If you work in retail at the Gap store at the local mall, you probably won't be asked to sign over IP rights, etc. But if you work in the Gap corporate office as the CIO or something, you probably would.