When Icahn buys a stock, he intends to be an active part of the business -- whether management wants him to or not. As a result, Icahn has become the poster boy for activist investors, going so far as to launch The Icahn Report, a blog that shares his thoughts on the struggles between investors and the management teams they employ. The approach works; Icahn's self-made wealth is estimated at $14 billion. >>5 Stocks to Buy to Be Like Buffett His deep conviction strategy for buying stocks means that when Icahn likes a stock, he loves it. That's all the more reason to pay attention to his buying and selling activities a regular basis. To do that, we'll turn to his firm's latest 13F filing. Institutional investors with more than $100 million in assets are required to file a 13F -- a form that breaks down their stock positions for public consumption. From hedge funds to mutual funds to insurance companies, any professional investors who manage more than that $100 million watermark are required to file a 13F. By comparing one quarter's filing to another, we can see how any single fund manager is moving their portfolio around. >>5 Stocks With Big Insider Buying Without further ado, here's a look at five of Carl Icahn's favorite stocks.