There are currently seven companies in the world with a market capitalization exceeding $1 trillion. Save for Saudi Aramco, they operate in the technology sector.

Warren Buffett's investment conglomerate, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), is the eighth most valuable company in the world with a market cap of about $870 billion. Shares of Berkshire have risen about 29% during the past year -- roughly in line with the S 500.

Let's break down why Berkshire is such a strong business, and how the company could be next to join the exclusive club of trillion-dollar companies.

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Source Fool.com