Investing.com - Earlier this month, Amazon (NASDAQ:AMZN) briefly overtook Microsoft (NASDAQ:MSFT) as the third largest U.S. company based on market capitalization, which is the multiple of a company's stock price and the number of outstanding shares of stock.Here are the top 10 market caps and how the company's stock performed over the past 12 months.1. Apple (NASDAQ:AAPL) -- $871.97 billion -- +18%)Apple is the clear number one and some say on its way to hitting a trillion dollars.2. Alphabet (NASDAQ:GOOGL) -- $766.67 billion -- +32%)Alphabet, the parent company of Google, is second.3. Microsoft -- $713.92 billion -- +49%)Microsoft is neck and neck with Amazon for third place.4. Amazon -- $710.84 billion -- +72%)Amazon is fourth--for now.5. Facebook (NASDAQ:FB) -- $511.31 billion -- +32%)Facebook is a distant number five.6. Berkshire Hathaway (NYSE:BRKa) -- $501.21 billion -- +20%)Warren Buffett's giant holding company is number six..JPMorgan Chase (NYSE:JPM) -- $398.01 billion -- +26%)JPMorgan Chase is seventh and one of two banks in the top ten8. Johnson & Johnson (NYSE:JNJ) -- $351.58 billion -- +9%)Healthcare giant Johnson & Johnson is eighth.9. Bank of America (NYSE:BAC) -- $328.47 billion -- +29%)Number nine is Bank of America.10. Exxon Mobil (NYSE:XOM) -- $320.96 billion -- -1.0%)Exxon Mobil ranks tenth and is the only company whose stock price has declined over the past 12 months.