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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.

Warren Buffett recently donated $6 billion worth of his company's stock to five philanthropic foundations, his biggest annual donation in nearly 20 years, according to Forbes. Since 2006, when Buffett committed to gradually giving away all of his Berkshire Hathaway stock,