Warren Buffett has one of the best and longest track records and is considered by many to be the greatest investor ever. Even at 93 years old, his mind seems as sharp as ever.

The average investor could boost their portfolio returns by looking at the stocks Berkshire Hathaway owns. If a company passes Buffett's test, it may be worth considering.

As of this writing, (NASDAQ: AAPL) makes up a notable 47.5% of the conglomerate's portfolio. Clearly, the Oracle of Omaha thinks highly of the dominant tech business. Let's take a closer look at what attributes drew Buffett to Apple and what prospective investors should do right now.

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Source Fool.com