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There is an excellent article on Forbes titled "US Businesses Can't Hide From GDPR" and that led me to the question - How many companies are unaware of their exposure?
The answer is actually very easy to determine. If you answer yes to both of these questions, then you are subject to the GDPR regulations.
If you answer no to question 2, you might still be subject to GDPR but it would benefit you to consult with legal council.