TSC Ratings provides exclusive stock, ETF and mutual fund ratings and commentary based on award-winning, proprietary tools. Its "safety first" approach to investing aims to reduce risk while seeking solid outperformance on a total return basis.Shares of Amazon ( AMZN) are up 46% this year and they might rise even more as the Internet retailer targets business customers and takes market share from rival eBay ( EBAY). "Buy"-rated Amazon has been out front with consumers, rolling out a new version of its Kindle digital reader and a new shopping application for BlackBerry users this year. But behind the scenes, the Seattle-based company has been expanding and upgrading its data storage and tech services for businesses. In the past year, Amazon has diversified its revenue stream and undercut the strongest brick-and-mortar retailers. We expect strong stock performance in the quarters ahead as recession-weary consumers seek bargains online and the company expands into potentially more profitable markets. Amazon, which announces first-quarter earnings next week, has been pushing its less-flashy data storage and e-commerce services to companies such as Target ( TGT ) and Timex. The services allow companies to use Amazon's technological resources to store data and power their Web sites. Management, led by founder Jeff Bezos, has been pitching these services as a way for businesses to cut costs. The company's three-year-old fulfillment service has grown in the past year, shipping 3 million units in the fourth quarter, up from about 500,000 in the year-earlier period. This service allows outside sellers to hire Amazon to store, pack and ship their products. The business customers benefit from the shipping deals Amazon offers to consumers. On the consumer front, Amazon has been expanding its "seller business," which competes with eBay's auction service. The number of active Amazon sellers rose 16% in the fourth quarter, outstripping eBay's 4% gain.