• Publix remains No. 1 in market share among grocery stores in Northeast Florida. The quarterly update by the Shelby Report of the Southeast trade publication says Walmart remains No. 2 followed by Winn-Dixie at No. 3. The three chains account for 85 percent of the grocery sales in Baker, Clay, Duval, Nassau and St. Johns counties. Publix and Walmart rose slightly while Winn-Dixie fell a fraction. Numbers are compiled by The Nielsen Co.-Trade Dimensions.