Amazon-Whole Foods deal sends shares of grocery chains, big-box stores into dive

Shares of big-box retailers and grocery chains sank Friday on news of Amazon’s planned $13.7-billion purchase of Whole Foods.

Shares of Kroger, owner of supermarket chains such as Ralphs and Food4Less, were down 14.41% to $21.02 Friday morning. Target shares fell 9.7% to $50.08, Costco shares were...