The recent deals with Carl Icahn show that such people usually know something else. Last week was really interesting in terms of such buyings. Warren Buffet and Bill Gates invested in some companies that you should at least take a look at:AutoNation Inc. (NYSE: AN) saw Cascade Investment, the investment company of billionaire and Microsoft founder Bill Gates, making huge purchases of the stock.Phillips 66 (NYSE: PSX) had a big time buyer on the desk again this past week. Warren Buffet’s Berkshire Hathaway scooped up 486,804 shares at prices between $74.39 and $78.59 apiece. Do you still have any doubts? I think that both stocks will go higher this year and I am thinking of buying them. When Carl Icahn picked up some Xerox shares, I didn't understand why he did it (Xerox recently announced the split). Now I don't want to miss such opportunities.