Walmart is on top of the Fortune 500. The retailer regained the lead this year after falling into second place in 2009 behind Exxon Mobile. The retailer was on top in 2008.Other retailers cracked the top 25 as well. CVS Caremark came in at 18th, grocer Kroger hit number 23, and Costco Wholesale rounded out the 25th spot.Not too many surprises here. Or are there?ALSO: Casey's Goes to Bat for Overlooked Retail Niche

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