Why Shares of AutoZone Suddenly Plunged

The auto parts retailer reported its fiscal first-quarter results this week.AutoZone (AZO 7.17%) shares plunged on Tuesday, making it the worst-performing stock in the S&P 500 index at midday. What's going on?Well, the automotive replacement parts and accessories chain reported its first-quarter financial results on Tuesday morning and Wall Street was not impressed.NYSE : AZOAutoZoneToday's Change( -7.17 %) $ -270.19Current Price$ 3496.77Key Data PointsMarket Cap$58BDay's Range$ 3460.23 - $ 3720.6352wk Rang ...