S&P 500 Gains and Losses Today: Walgreens Stock Pops After Promising Results

Key TakeawaysThe S&P 500 plunged 1.5% on Friday, Jan. 10, as an unexpected surge in hiring in the December jobs report raised concerns about interest rate policy.Shares of Constellation Brands tumbled after the beer and wine maker reduced its full-year sales guidance.Strong results from Walgreens Boots Alliance suggested early progress on the drugstore operator's turnaround plan, and its shares surged. Major U.S. equities indexes plunged as the markets returned to action Friday following a day of mourning f ...