Wikimedia Foundation

Wikimedia Foundation, Inc.
Abbreviation	WMF
Founded	June 20, 2003, St. Petersburg, Florida, U.S.
Founder	Jimmy Wales
Type	501(c)(3), charitable organization
Tax ID no.	EIN 200049703
Location(s)	One Sansome Street; San Francisco, California, U.S.;
Region served	Worldwide; (banned in some territories)
Products	Wikipedia, MediaWiki, Wikibooks, Wikidata, Wikifunctions, Wikimedia Commons, Wikinews (discontinued), Wikiquote, Wikisource, Wikispecies, Wikiversity, Wikivoyage, Wiktionary
Members	Board-only
CEO	Bernadette Meehan
Revenue	$207.5 million (2026); $208.6 million (2025); $185.4 million (2024); $180.2 million (2023); $167.9 million (2022);
Expenses	$208.5 million (2026); $190.9 million (2025); $178.6 million (2024); $168.3 million (2023); $145.8 million (2022);
Endowment	$169.4 million (2025)
Employees	650 (2025)
Volunteers	277,000 (2024)
Website	wikimediafoundation.org ; foundation.wikimedia.org (Governance);
ASNs	14907, 11820

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The Wikimedia Foundation, Inc. (WMF) is an American 501(c)(3) nonprofit organization headquartered in San Francisco, California, and registered there as a charitable foundation. It is most known for hosting Wikipedia, one of the world's most visited websites. It also hosts and operates 14 related open collaboration projects, and supports the development of MediaWiki, which is the wiki software that underpins them. The foundation was established in 2003 in St. Petersburg, Florida by Jimmy Wales, as a nonprofit way to fund Wikipedia and other wiki projects that had previously been hosted by Bomis, Wales's for-profit company.

The Wikimedia Foundation provides the technical and organizational infrastructure to enable members of the public to develop wiki-based content in languages across the world. The foundation does not write or curate any of the content of any associated projects. Instead, this is done by volunteer editors, such as the Wikipedians. However, it does collaborate with a network of individual volunteers and affiliated organizations, such as Wikimedia chapters, thematic organizations, and user groups.

The foundation finances itself mainly through millions of small donations from readers and editors, collected through email campaigns and annual fundraising banners placed on Wikipedia and its sister projects. These are complemented by grants from philanthropic organizations and tech companies and, since 2022, by services income from Wikimedia Enterprise. As of 2023, it has employed over 700 staff and contractors, with net assets of $255 million and an endowment that has surpassed $100 million.