Amazon.com

What started as Earth's biggest bookstore has rapidly become Earth's biggest anything store. Expansion has propelled Amazon.com in innumerable directions. The firm's main website offers millions of books, CDs, DVDs, and videos (which still account for the majority -- 70% -- of the firm's sales), not to mention auto parts, toys, tools, electronics, home furnishings, apparel, health and beauty goods, prescription drugs, groceries, and services including film processing. Long a model for Internet companies that put market share ahead of profits, Amazon.com also made acquisitions funded by meteoric market capitalization and is now focused on profits. Founder Jeff Bezos owns more than 24% of the firm.

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