Billionaire investor Warren Buffett has a massive following in the investing world. Many investors often mimic his picks, knowing that investments Buffett chooses for his portfolio have solid fundamentals and can make for good long-term investments. The three top holdings in the Berkshire Hathaway portfolio today are Apple (NASDAQ: AAPL), Bank of America (NYSE: BAC), and American Express (NYSE: AXP). Here's how you would have done if you invested $10,000 into each one of them 10 years ago.

Apple is the top holding in the Berkshire Hathaway portfolio, at around 41% of the portfolio. The next largest stock (Bank of America) accounts for less than 11%. Buffett is a big fan of Apple's business and it's hard not to like a company that has such a loyal customer base.

In each of the past three fiscal years (Apple's year ends in September), the company has generated at least $100 billion in pre-tax profits. And its revenue during those years has totaled at least $365 billion. The company generates great margins on its iPhones and iPads and with more than 2 billion active Apple devices, there's a huge user base to whom the company can potentially upsell more products and services.

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Source Fool.com