The 20 private companies that sponsor MLB stadiums shell out millions of dollars a year in rights fees. They also get massive amounts of media exposure in return.

This week, Joyce Julius & Associates measured the overall value of this media exposure.

The firm looked at newspapers, TV, and Internet sites to determine how many times each of the 20 sponsors was mentioned. Then, they calculated the overall value of these mentions by figuring out how much that exposure would cost through traditional advertising.

The leader by far was Citigroup, who got $5 million worth of exposure during the first three months of the season. Meanwhile, Overstock.com Coliseum in Oakland earned a measily $289,000 in exposure.

But all of these companies got exposure. The real question is which ones got the most exposure relative to the amount they have to pay their MLB teams for naming rights?

To find out which sponsor got the most exposure bang for their naming rights buck, we calculated the amount that three months of naming rights cost each company under their respective contracts, then compared that to the amount of exposure they received in the first three months of the MLB season.

Since the value of media exposure contains more than just TV, print, and Internet mentions, this number is not exact. But it’s still a good way to see which companies got a good deal, and which companies got doped.