Berkshire Hathaway's leadership change doesn't mean a shift in strategy. Mastercard leads an industry with massive remaining whitespace. Warren Buffett, arguably the greatest investor of all time, is renowned for his long-term investment approach.

Warren Buffett donated on Friday another $6 billion of Berkshire Hathaway stock to the Gates Foundation and four family charities, his biggest annual donation since he began giving away his fortune nearly two decades ago.

Famed investor Warren Buffett is donating $6 billion worth of his company's stock to five foundations, bringing the total he has given to them since 2006 to roughly $60 billion, based on their value when received.