Though one may not initially think of Apple (NYSE: AAPL) (read more on Apple's Dividend Announcement ) and Amazon (NYSE: AMZN) to be direct competitors, both companies pose a significant threat to the electronic retailer. AAPL's own retail stores no longer make BBY a center for all the latest in tech and AMZN's convenience and pricing is increasingly becoming preferable to consumers. Frankly, we are not sure that BBY's eCommerce platform will be able to hold its own against powerhouse, AMZN. We also see Wal-mart (NYSE: WMT) and eBay (NASDAQ: EBAY) as competitors that will chip away at BBY's market share. However, David Einhorn, Steve Leonard, and Daniel Bubis still like the stock. Billionaire David Einhorn increased his position in the stock by 10% over the fourth quarter and had $180 million invested in the stock at the end of December. It has been a losing position for Einhorn. He bought Best Buy during the first quarter of 2011. The stock lost 14% over the past 52 weeks.