Warren Buffett's Berkshire Hathaway is known for having huge stakes in companies like Apple, Coca-Cola, and Bank of America. But the conglomerate also has much smaller positions.

It has a tiny holding in (NYSE: V) that most investors might not know about. Despite this being a high-quality business that Buffett owns, it's not without downside. There's one key risk facing this otherwise phenomenal stock that has climbed 403% in the past decade.

Visa has made its early investors rich, but it's not a perfect company. Perhaps the biggest risk facing the business is from regulators. In 2011, the Durbin Amendment, which was passed as part of the Dodd-Frank Wall Street Reform and Consumer Protection Act, went into effect. The goal was to cap the fees that merchants paid to accept debit-card payments.

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Source Fool.com