Wikimedia Foundation

Wikimedia Foundation, Inc.
AbbreviationWMF
FoundedJune 20, 2003 (2003-06-20), St. Petersburg, Florida, U.S.
FounderJimmy Wales
Type501(c)(3), charitable organization
Tax ID no.
EIN 200049703
FocusFree, open-content, multilingual, wiki-based Internet projects
Location
Area served
Worldwide
(banned in some territories)
ProductsWikipedia, MediaWiki, Wikibooks, Wikidata, Wikifunctions, Wikimedia Commons, Wikinews, Wikiquote, Wikisource, Wikispecies, Wikiversity, Wikivoyage, Wiktionary
MembershipBoard-only
CEO
Maryana Iskander
Revenue
  • $185.4 million (2024)
  • $180.2 million (2023)
  • $167.9 million (2022)
Expenses
  • $178.6 million (2024)
  • $168.3 million (2023)
  • $145.8 million (2022)
Endowment> $100 million (2021)
Employees363 (2024)
Volunteers277,000 (2024)
Website
ASNs14907, 11820
[1][2][3][4][5]

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.[6] It is the host of Wikipedia, the tenth most visited website in the world. It also hosts fourteen related open collaboration projects, and supports the development of MediaWiki, the wiki software which underpins them all.[7][8][9] The foundation was established in 2003 in St. Petersburg, Florida by Jimmy Wales, as a non-profit way to fund Wikipedia and other wiki projects[1] which had previously been hosted by Bomis, Wales' for-profit company.[1]

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.[10] The foundation does not write or curate any of the content on the projects themselves.[11] 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, user groups and other partners.

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.[12] These are complemented by grants from philanthropic organizations and tech companies, and starting in 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 which has surpassed $100 million.

  1. ^ a b c Cite error: The named reference Announcing Wikimedia Foundation was invoked but never defined (see the help page).
  2. ^ Villagomez, Jaime; Ball, Valerie J. (May 11, 2016). Return of organization exempt from income tax 2014: Wikimedia Foundation, Inc (PDF) (Form 990). EIN 200049703. Archived (PDF) from the original on September 14, 2016. Retrieved December 13, 2016 – via wikimedia.org.
  3. ^ "File:Wikimedia Foundation FY2021–2022 Audit Report.pdf – Wikimedia Foundation Governance Wiki" (PDF). Foundation.wikimedia.org. Retrieved December 4, 2022.
  4. ^ Cite error: The named reference Endo100 was invoked but never defined (see the help page).
  5. ^ "Wikimedia Foundation Org (EIN: 20-0049703)". Nonprofit Explorer. ProPublica. December 31, 2023. Retrieved August 18, 2025.
  6. ^ Hanson, Jarice (2016). The Social Media Revolution: An Economic Encyclopedia of Friending, Following, Texting, and Connecting. ABC-CLIO. p. 375. ISBN 978-1-61069-768-2.
  7. ^ Jacobs, Julia (April 8, 2019). "Wikipedia Isn't Officially a Social Network. But the Harassment Can Get Ugly". The New York Times. Archived from the original on September 14, 2021. Retrieved August 29, 2021.
  8. ^ Cite error: The named reference WiredWikimediaEnterprise was invoked but never defined (see the help page).
  9. ^ Culliford, Elizabeth (February 2, 2021). "Exclusive: Wikipedia launches new global rules to combat site abuses". Reuters. Archived from the original on August 3, 2021. Retrieved August 29, 2021.
  10. ^ Cite error: The named reference wikimedia-mission was invoked but never defined (see the help page).
  11. ^ "A victory for free knowledge: Florida judge rules Section 230 bars defamation claim against the Wikimedia Foundation". diff.wikimedia.org. October 5, 2021. the plaintiff argued that the foundation should be treated like a traditional offline publisher and held responsible as though it were vetting all posts made to the sites it hosts, despite the fact that it does not write or curate any of the content found on the projects
  12. ^ "Fundraising report 2020–2021". Wikimedia Foundation.
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