These stocks' valuations stand out in an expensive stock market.

Warren Buffett is well known for his preference for holding investments long term. "When we own portions of outstanding businesses with outstanding managements, our favorite holding period is forever," he wrote in his 1988 letter to Berkshire Hathaway ( BRK.A 0.62% ) ( BRK.B 0.46% ) shareholders.

But Buffett clarified his comments in his 2016 letter to shareholders. "We have made no commitment that Berkshire will hold any of its marketable securities forever." That certainly rings true with Berkshire investors today, who have seen Buffett sell off $177 billion worth of stock over the last three years. But there are a handful of stocks that Buffett looks unlikely to sell for the foreseeable future, perha

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