depends on which division of Samsung.
Samsung is huge. not just cell phone huge, but we're talking about a company on the scale that not only makes Cell phones, but CPUs, processors, chipsets, camera parts, networking components, washing machines, dryers, microwaves, fridges, home appliances other than that, military equipment, large shipping boats...
really.
they make military grade weaponry and equipment too.
to say that Apple is a LARGE part of their business is probably overestimating Samsung' reliance on Apple for business.
http://en.wikipedia.org/wiki/Samsung