I think you've answered your question, at least for now. Only disadvantage of #3 is if it's not fine-grained enough. You know you need _at least_ a macro level

I think you've answered your question, at least for now. Only disadvantage of #3 is if it's not fine-grained enough. You know you need _at least_ a macro level split (New umbrella parent company (that nobody really knows/cares much about), sub-companies are "Mobile Jazz" and "product brand"). If products grows enough, it may need it's own splits too, but keep it one for now.