Thanks to his unbelievable track record of allocating capital as the longtime CEO of Berkshire Hathaway, it's not a shock that Warren Buffett is one of the most closely watched investors out there. The average person can follow his moves to find potential stock ideas.

The conglomerate has dozens of holdings, but there's a single position that stands out. After purchasing shares of Apple (NASDAQ: AAPL) in the first quarter of 2016, this "Magnificent Seven Stock" now makes up 43% of Berkshire's $400 billion portfolio. That's thanks to a monster 730% rise in the share price since the start of 2016.

Investors can learn a lot by figuring out Buffett's thought process when he first made the decision to buy Apple stock.

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Source Fool.com