The six most valuable companies in the world by market cap all have one thing in common: each is valued at over $1 trillion. Five of the six are in the technology business, with the exception being Saudi Arabian Oil.

With a market cap of roughly $592 billion, Eli Lilly (NYSE: LLY) is the world's largest healthcare company and the 10th most valuable business in the world.

Indeed, Lilly stock has been on a tear lately. In just the last year, the stock has returned nearly 80% -- about triple the return of the S&P 500.

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Source Fool.com