If you're in this group, there aren't many loop-holes.
One strong case for why your company might not need to mess with CMMI would be if you are selling a product of your own specification.
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CMMI is about improving performance through improving operational processes.
In particular, it's improving processes associated with managing how organizations develop or acquire solution-based wares and define and deliver their services.
Another way to look at CMMIs are that they focus on the business processes of developing engineered solutions (DEV), acquiring goods and services (ACQ) and delivering services (SVC).
To date, CMMI has most widely applied in software and systems engineering organizations.