Outfront Media, Inc. is one of the largest outdoor media companies. It operates in markets including the United States and Canada. The Americas division is led by chief executive officer Jeremy Male. Outfront Media operates both billboards and transit displays. History TDI (Transportation Displays Incorporated) was the first predecessor company for transit advertising, publishing advertising for passenger railroad timetables and displays in railroad terminals. TDI was first incorporated in 1938. TDI was sold to IT&T in the early 1970s and then to the Winston Network in the early 1980s, it was later renamed TDI in 1989 led by Bill Apfelbaum. In 1996 the company was sold to Infinity Broadcasting. The transit business and the billboard business merged in 2001 under the name Viacom Outdoor. The billboard division was originally two separate companies: National Advertising Company (also known as 3M National or National 3M), the outdoor advertising subsidiary of 3M; and Gannett Outdoor, owned by the Gannett Company. In August 1996, Gannett exited the billboard business by spinning off Gannett Outdoor and selling it to Phoenix, Arizona-based Outdoor Systems Advertising. OSI would later acquire 3M National in May 1997, but before that sale was finalized, the United States Justice Department ruled that Outdoor Systems had to sell nearly all of its 3M billboards in ten U.S. cities (all 3M billboards in Phoenix, Arizona; Sacramento, California; New Orleans; Louisville, Kentucky; Denver; Detroit; Kansas City, Missouri and Grand Rapids, Michigan; plus almost all 3M billboards in Atlanta and half of 3M's billboards in Houston) where both Outdoor Systems (OSI) and 3M National already had billboards to Lamar Advertising to avoid a monopoly in these cities. On December 7, 1999, Outdoor Systems (OSI) was bought by Infinity and became Infinity Outdoor. Infinity was absorbed into Viacom in 2001, and became Viacom Outdoor. When Viacom split from CBS Corporation in December 2005, it became CBS Outdoor. CBS owned CBS Outdoor as a division of CBS until March 2014, at which point it was spun off into an independent company. CBS Corporation continued to own 83% of Outfront Media, although this number is expected to decline over time as Outfront Media converts into a real estate investment trust and CBS Corporation divests itself of the outdoor unit. CBS Outdoor shares began trading on the New York Stock Exchange on March 28, 2014. In July 2014, it was announced that CBS Outdoor would acquire the billboard business