In the following video, Motley Fool financial analyst Matt Koppenheffer talks about the top two holdings in his own personal portfolio, Wal-Mart (NYSE:WMT) and Berkshire Hathaway (NYSE:BRK-B). He tells us why he thinks Wal-Mart's competitive moat is an enduring one and what he likes about the structure of giant Berkshire Hathaway.

David Hanson has no position in any stocks mentioned. Matt Koppenheffer owns shares of Berkshire Hathaway and Wal-Mart. The Motley Fool recommends and owns shares of Amazon.com and Berkshire Hathaway. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.