Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can a company block a specific person from buying its stock?
A more serious problem: how do you know who's really buying your stock? "Shell companies" are an increasingly obvious problem in corporate and tax accountability. There are jurisdictions where companies can be created with secret lists of directors and shareholders. If stock is bought by one of these companies, it is very hard to trace it to a particular individual.