(Image source: cbsoutdoor.com) The advertising arm of CBS Corporation (NYSE:CBS) will begin trading today on the NYSE under the ticker symbol “CBSO”. CBS Outdoor Americas is one of the largest advertising companies in the U.S. with a portfolio consisting of billboards in major metropolitan cities. In addition, Outdoor Americas also has displays in Latin America and Canada. Yesterday, the IPO was priced at $28 per share, which gives the company a market cap of $3.36 billion. With the IPO price at $28 a share, the company could raise as much as $560 million from the offering.