The plunge in Amazon.com Inc.'s stock AMZN, -4.06% following a disappointing third-quarter earnings report and outlook puts the ecommerce giant on track to lose its place as a trillion-dollar company for the first time in 2 1/2 years. The stock dropped 12.0% in premarket trading, and is heading for the first trade below the $100 level during regular-session hours since April 7, 2020.