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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,

The billionaire investor's latest $6 billion donation of Berkshire Hathaway shares is part of his 2006 commitment to give away over 99% of his wealth.