Berkshire Hathaway owns dozens of companies in its massive $370 billion public equities portfolio. But there's one that stands out above the rest.

I'm talking about (NASDAQ: AAPL). The iPhone maker represents a whopping 42% of the Warren Buffett-led conglomerate's holdings. This certainly means that there are individual investors out there who are considering buying the FAANG stock.

While Apple has worked out as a fantastic investment in the past several years, it isn't without a key downside factor that you should know about before rushing to buy shares. With that being said, here's the biggest bear case for this top Buffett stock.

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Source Fool.com