Thanks to Warren Buffett's remarkably successful track record of increasing shareholder value as the leader of Berkshire Hathaway, his investment moves are closely watched by retail investors. But not all of the equities the conglomerate holds in its portfolio are great buys today.

Some of the stocks that Buffett owns are almost no-brainer picks. In my view, two companies he owns should be added to your portfolio right now. There is one Buffett stock, however, that you should avoid if you're looking for investments that can outperform the S 500 over the long term.

Investors can buy (NYSE: V) and Mastercard (NYSE: MA) without hesitation. Combined, they make up less than 1% of Berkshire's portfolio, but they have been massive winners historically. In the past decade, Visa shares are up 410% and Mastercard shares are up 535%.

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Source Fool.com