If someone glanced at Warren Buffett-led Berkshire Hathaway's colossal $371 billion portfolio, they'd notice something almost immediately. And that is the simple fact that a single company makes up some 43% of the entire portfolio.

That stock is none other than Apple (NASDAQ: AAPL). The consumer tech juggernaut has been a fantastic investment for the Oracle of Omaha, soaring 564% in the past eight years and crushing the broader Nasdaq Composite index.

After this remarkable run, this "Magnificent Seven" constituent is pretty expensive. But is the stock still a buy?

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Source Fool.com