US Restaurant Groups Lacking Mexican Assets

I'm looking for a comprehensive list of US based restaurant groups or franchisees that currently do not possess a Mexican restaurant asset. This project may also extend to private wealthy individuals or family offices that own a chain of restaurants and may be interested in expanding into the Mexican cuisine space.

Ideal candidates for this project:
- Restaurant franchise owners
- Private wealthy individuals with a keen interest in the restaurant industry
- Family offices that own a chain of restaurants
- Investors looking to diversify their restaurant portfolio

Please note, the scope of this project covers the entire United States.