The Biggest Companies in the World in 2021 By: TalkMarkets June 10, 2021 at 23:52 PM EDT Here are the world’s biggest businesses by market capitalization, as well as the countries and sectors they are from. Read More >> Related Stocks: Alibaba Group Holding Ltd Alphabet-A Amazon.com Apple Berkshire Hathaway Facebook Microsoft Tencent Holdings ADR Tesla, Inc.