Top Companies by Market Cap

Top Companies by Market Cap
By market capitalization, as of January 2022, Apple (AAPL) is the biggest company at $2.652 trillion, followed by Microsoft (MSFT) at $2.222 trillion, Google (GOOGL) at $1.725 trillion, Amazon.com (AMZN) at $1.446 trillion, Tesla (TSLA) at $947.92 billion, and Meta (META), formerly Facebook, at $843.34 billion.
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Back in 2007, Chinese energy giant PetroChina (PTR) reached an estimated market value of around $1 trillion. However, this valuation didn't stick. As of January 2022, PTR's market capitalization stood at just $146.95 billion.
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Top Companies by Revenue
In terms of the biggest global companies by revenue, Walmart (WMT) comes in as number one—according to the Fortune 500 list. Walmart's revenues were $523,964 billion in 2021. Behind Walmart was State Grid with $383,906 billion in revenues, followed by Amazon with $280,522 billion, and China National Petroleum at $379,130 billion.
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Sinopec Group ranks fifth with $407,009 billion in annual revenues, and the sixth and seventh spots are covered by Apple and CVS Health with $260,174 billion and $256,776 billion in yearly revenues, respectively.
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Based on only U.S.-headquartered companies' 2020 performance, Walmart still has the top spot, while Amazon comes in second. Exxon Mobil ranks third and Apple ranks fourth. Healthcare companies take up the fifth, seventh, and eighth spots: CVS, UnitedHealth Group, and McKesson, generating $256.78 billion, $242.15 billion, and $231.05 billion, respectively.
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Berkshire Hathaway ranks sixth with $254.62 billion in annual revenues, and the ninth and tenth spots are covered by AT&T and AmerisourceBergen at $181.19 billion and $179.59 billion in yearly revenues, respectively.
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Based on only U.S.-headquartered companies' 2019 performance, Walmart still has the top spot, while ExxonMobil (XOM) comes in second with $290.21 billion a year in revenues. Apple ranks third with $265.59 billion and Berkshire Hathaway fourth with $247.84 billion. Healthcare companies take up the sixth through eighth spots: UnitedHealth Group, McKesson, and CVS, generating $226.25 billion, $214.32 billion, and $194.58 billion, respectively.
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Top Private Companies
In terms of private companies, Forbes ranks Minnesota-based Cargill as the largest private U.S. company with $134.4 billion in annual revenues. The company has 155,000 employees. Second is Koch Industries with $115 billion in revenues and 122,000 employees. Ranking third is the grocery chain Publix Super Markets, with $44.9 billion in annual revenue and 227,000 employees.
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The fourth and fifth largest private companies are Mars and H-E-B, which generate $40 billion and $32.8 billion, respectively. Each employs over 100,000 employees.
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The Bottom Line
On a pure market value measure, Apple has often been considered the most valuable, publicly traded company of all time. Although Microsoft did briefly hit the $2 trillion market cap mark in June 2021. It is certainly possible another company’s market cap will exceed these measures, and maybe—though less likely—another company will surpass Berkshire Hathaway as the highest priced single stock share.