Amazon crossed a $1 trillion market capitalization in September 2018.
Amazon passed the milestone on September 4, 2018, when its share price rose above the level required for the company’s outstanding shares to be worth more than $1 trillion. It became the second U.S. company to reach that valuation after Apple.
The milestone marked the transformation of Amazon from an online bookseller into a diversified company spanning e-commerce, logistics, cloud computing, digital advertising, streaming, and consumer devices. Amazon Web Services was especially important because cloud services became a major source of revenue and operating profit.
Amazon was founded by Jeff Bezos in 1994 and began as an online bookstore. Its market capitalization later moved far above and below $1 trillion as technology stocks and interest rates changed, so the date refers specifically to the first crossing of the threshold.