Warren Buffett is known for picking the right stocks, and his choices have produced billions of dollars in returns and double-digit percentage gains over time. As chairman of Berkshire Hathaway, Buffett has delivered compound annual growth of more than 19% over 57 years. That's compared to 9.9% for the S 500. So, it's clear investors are right to pay close attention to the stocks he buys.

But Berkshire Hathaway actually doesn't own tons of stocks. There are only 45 names in the portfolio now -- and most of its value comes from just a few favorites. One of them is tech giant (NASDAQ: AAPL), which accounts for almost half of the portfolio.

And right now, Buffett has reason to be happy about this investment since Apple has climbed by almost 50% this year. But for investors who haven't yet bought Apple and would like to follow in Buffett's footsteps, is it too late? After such a gain, should you still buy this top stock?

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Source Fool.com