The Wikimedia Foundation (WMF) is an American non-profit and charitable organization headquartered in San Francisco, California. It owns the domain names and operates most of the movement's websites, like Wikipedia, the Internet encyclopedia, as well as Wikimedia Commons.

The WMF was founded in 2003 by Jimmy Wales as a way to fund Wikipedia and its sister projects through non-profit means. Its purpose is "... to empower and engage people around the world to collect and develop educational content under a free license or in the public domain, and to disseminate it effectively and globally."

According to the WMF's 2015 financial statements, in 2015 the WMF had a budget of $72 million USD, spending $52 million USD on its operation, and increasing its reserves to $82 million USD.

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