This article discusses the upcoming deadline for institutional investors to file Form 13F with the SEC, which allows investors to see which stocks leading money managers have been buying and selling. Warren Buffett’s Berkshire Hathaway portfolio is highlighted, with details on three stocks he purchased and one he sold during the previous quarter. Buffett purchased shares of Sirius XM Holdings, Occidental Petroleum, and VeriSign, while selling shares of Bank of America. The article also discusses the reasons behind Buffett’s investment decisions, such as sustainable competitive advantages, value proposition, and legal monopolies. Additionally, it mentions Buffett’s preference for value investing and his recent trend of selling more stock than buying. The article concludes with a mention of the Motley Fool Stock Advisor team’s top 10 stock picks for investors to consider.