The following graphic shows the startling range of companies that have the naming rights for North American major league sports arenas, broken down by company market. That is, each company is categorised according to its primary industry.
The category "other" includes all companies which sponsored only one arena, eg. Petco Park in San Diego is the only stadium sponsored by a pet service company. Traditionally named stadia are those whose iconic status is enough to generate income rather than relying upon corporate sponsorship - for example, Candlestick Park or Arrowhead Stadium. (It is debatable whether multinational sports companies like Fenway Sports Group or the Madison Square Garden corporation in fact "sponsor" their arenas; for this purpose, they are lumped in with "traditionally" named stadia.)
As you can see, Financial Service, banking and mobile telephone companies dominate the naming rights landscape.
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