They're broken down by Districts. Every NASD Member Firm, and their OSJ's if any, are assigned supervisors within the various districts.
Don't waste an NASD employee's time with such an inane question, you can learn more at their website.
"The penny stock investor may be the most dangerous creature in the investment world, at least to himself.[...]His hypocrisy becomes most apparent when he then blames his losses on the greed of others." Robert C. Dugan, Director - JRM Capital