With Berkshire Hathaway delivering an average annual return of around 19.8% over almost six decades, Buffett clearly knows what he's doing. Unsurprisingly, he hasn't diversified Berkshire's holdings as much as most investors would.

These five companies -- one of which is near and dear to the Oracle of Omaha's heart -- stand out for all the right reasons.

You may want to peruse Warren Buffett's portfolio for ideas. After all, Buffett and his investing colleagues Todd Combs and Ted Wechsler at Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) only seek out competitively advantaged,