The Bill & Melinda Gates Foundation (B&MGF) is the largest transparently operated[2] charitable foundation in the world, founded by Bill and Melinda Gates in 2000 and doubled in size by Warren Buffett in 2006.

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As of 2006, the foundation has an endowment of approximately US$34.6 billion. To maintain its status as a charitable foundation, it must donate at least 5% of its assets each year.[10] Thus the donations from the foundation each year would amount to over US$1.5 billion at a minimum.