Warren Buffett remains one of the best investors of all time. If you want to buy profitable stocks, pay attention to the portfolio moves at Buffett's holding company, Berkshire Hathaway.

What is Berkshire Hathaway buying right now? Two recent stock purchases should get you excited.

Most investors know the basics of how Berkshire Hathaway operates. At its core is a suite of insurance companies, many of which have been wholly owned for decades. These insurance companies generate regular investable cash known as "float." Buffett and his team, therefore, have a steady supply of capital to put to work, unconstrained by market volatility. When markets crash, many of these insurance companies generate the same level of investable cash as they did during bull runs -- a major advantage versus other investors, who are typically cash poor during market downturns.

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Source Fool.com