Other than having to report their financials to the SEC, I don't think there's much in the way of share structure or price that companies need to be concerned about in moving to the OTCBB. Anyway, that's what I get from reading on their website.
The following is from the SEC site.
No Minimum Listing Standards:
Companies that trade their stocks on major exchanges and in the Nasdaq Stock Market must meet minimum listing standards. For example, they must have minimum amounts of net assets and minimum numbers of shareholders. In contrast, companies on the OTCBB or the Pink Sheets do not have to meet any minimum standards.
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