ADP, or Automatic Data Processing, is a publicly traded company, meaning it is owned by its shareholders. To summarize, ADP is a publicly traded entity, and its ownership is distributed among its shareholders. The question of who owns ADP can be answered by stating that it is not owned by a single individual or entity but by numerous shareholders who hold its stock. This ownership structure is typical for publicly traded companies, where shares are bought and sold on the stock market, allowing a wide range of investors to own a portion of the company.