After more than 50 years of trading on the New York Stock Exchange, Walmart has made a change.Are you looking for the Walmart (WMT +0.38%) ticker on the New York Stock Exchange?After more than half a century trading on the NYSE, you'll no longer find Walmart there. The retailing behemoth just moved its listing from the NYSE to the tech-heavy Nasdaq exchange. Its first day of trading on the Nasdaq was Dec. 9.NASDAQ : WMTWalmartToday's Change( 0.38 %) $0.43Current Price$ 115.72Key Data PointsMarket Cap$921BD ...