Many people believe that Warren Buffett is the greatest investor ever. As the longtime CEO of Berkshire Hathaway, he has held many winning investments.

Perhaps his most successful is (NASDAQ: AAPL). The conglomerate first started buying shares in the iPhone maker during the first quarter of 2016. And since the start of that year, shares have skyrocketed an incredible 615%.

A whopping 45.7% of Berkshire's entire portfolio is represented by just Apple. With such a high weighting, coupled with a market cap of $2.9 trillion and a price-to-earning (P/E) ratio of 30.4, it forces one to wonder why the Oracle of Omaha still owns Apple today.

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Source Fool.com