Walmart accounted for 21.1 percent of grocery store purchases in the Charlotte, NC, market last year compared to Harris Teeter, which held a 16.5 percent of the market. The nation’s biggest retailer surpassed Harris Teeter, a company founded in the state and now owned by Kroger, as the top grocer in the Charlotte area back in 2011. Food Lion came in third with a 15.6 percent share of market.