Berkshire Hathaway, the conglomerate headed by Warren Buffett, has its hands in numerous industries. But it also has a huge public equities portfolio, valued at roughly $350 billion. By looking at what the legendary investor owns, the average investor immediately has a valuable source of new stock ideas to consider. 

But of the dozens of stocks Buffett owns, there's one you might want to take a closer look at right now. Top financial enterprise American Express (NYSE: AXP) is the third-largest holding, as Berkshire owns 20% of the outstanding shares. It has a unique business model that has its advantages. 

So, is this top Buffett holding a no-brainer stock for your portfolio? 

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Source Fool.com