Berkshire Hathaway, the conglomerate headed by famed investor Warren Buffett, has a huge public equities portfolio currently valued at more than $350 billion. Investors analyze this list of companies to find worthwhile investment opportunities, which seems like a good idea given the Oracle of Omaha's stellar track record. 

But of the dozens of stocks that Warren Buffett owns, I'm most excited about Mastercard (NYSE: MA), which makes up just a tiny 0.5% fraction of Berkshire's overall portfolio. 

Anyone who follows Buffett would know that he has a liking for companies that are in favorable financial positions. Just look at Apple, which is Berkshire's largest holding by far. The tech behemoth generated more $110 billion of free cash flow (FCF) last fiscal year and currently has $57 billion of net cash on the balance sheet. The benefit of this is that the business has virtually no chance of running into any financial troubles. 

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Source Fool.com