Something new and significant is taking shape. For a variety of reasons—the impact of the JOBS Act, the growing popularity of equity private placements, the appearance of new trading markets for venture capital and other non-reporting companies—a new tier of companies is growing rapidly that is composed of issuers that are not "reporting" companies, but that do have a significant number of shareholders. In terms of the size of their shareholder class, these companies overlap with public companies, but they trade in the dark—and actively. More importantly, as their number grows, it is predictable that existing and new trading venues will begin to compete to attract and capture the trading interest in these stocks. This column will call these firms "semi-public companies" to reflect their intermediate status, midway between truly private firms (such as early stage venture capital startups and family-held firms) and public companies.