Wikimedia Foundation
American charitable nonprofit that provides the infrastructure, funding, technology, and organizational support for Wikipedia and other free-knowledge projects.
Last updated October 23, 2026
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Overview
The Wikimedia Foundation is a United States–based charitable nonprofit best known for operating Wikipedia, one of the world’s most widely used reference websites. It also supports a network of related projects, including Wiktionary, Wikibooks, Wikiquote, Wikisource, Wikimedia Commons, Wikispecies, Wikinews, Wikiversity, Wikidata, Wikivoyage, and Wikifunctions, as well as the MediaWiki software and technical services that underpin much of the Wikimedia ecosystem. The foundation was established in 2003 by Jimmy Wales as an independent nonprofit successor to the early funding and hosting arrangements provided by Bomis, Wales’s commercial company. Its creation gave Wikipedia and its sister projects a charitable institutional home, helped place important trademarks and domain names under nonprofit stewardship, and created a mechanism for raising funds without relying on advertising or subscription paywalls. The organization subsequently obtained recognition as a United States 501(c)(3) public charity. Wikimedia projects are developed and governed principally by volunteer communities. The foundation does not ordinarily write, edit, or approve the encyclopedia and other project content. Instead, it operates servers, software, security systems, legal and policy functions, fundraising programs, grants, communications, and community-support activities that enable volunteers to create and maintain freely licensed knowledge in many languages. Its work is therefore infrastructural and institutional rather than editorial in the conventional publishing sense. The foundation’s income has historically come primarily from individual donations, especially annual fundraising banners and reader-email appeals. It also receives grants and institutional support. In the 2020s it added Wikimedia Enterprise, a paid, high-volume data-delivery service for organizations that need structured access to Wikimedia content and APIs. This commercial service operates alongside the foundation’s public mission and is intended to help large-scale users consume Wikimedia data reliably while preserving public access to the projects. The organization collaborates with independent Wikimedia chapters, thematic organizations, and user groups around the world. These affiliates conduct outreach, edit-a-thons, cultural-institution partnerships, conferences, policy work, and other movement activities, but they are legally separate from the foundation. Wikimedia also convenes the global community through Wikimania and supports technical development, research, public policy advocacy, and free-license education. Its present identity combines a global digital infrastructure operator, a charitable knowledge institution, a software steward, and a movement-support organization. The foundation’s core positioning is based on free access, volunteer participation, multilingual knowledge, open licensing, independence from advertising, and long-term preservation of public information.
History
Wikipedia began in 2001 as a volunteer-edited companion project to Nupedia, with early financial and technical support from Bomis, the company associated with Jimmy Wales. As participation expanded, the community opposed introducing advertising as the primary funding model and began considering an independent charitable structure. A foundation could preserve the projects’ free-access character, hold trademarks and domains, raise donations, and fund servers and software without converting the projects into conventional commercial media. The Wikimedia Foundation was incorporated in Florida on June 20, 2003. Its first fundraising drive followed later that year, prompted in part by the practical cost of keeping the rapidly growing service online. The foundation received United States 501(c)(3) public-charity status in 2005, making qualifying donations tax-deductible for U.S. federal purposes. During its early years it assumed responsibility for project domains, trademarks, servers, fundraising, and development while volunteer communities retained primary responsibility for project content and editorial rules. The organization expanded beyond Wikipedia as additional projects were created, including Wiktionary, Wikibooks, Wikiquote, Wikimedia Commons, Wikisource, Wikiversity, Wikinews, Wikispecies, Wikivoyage, Wikidata, and later Wikifunctions. It also became the principal steward of MediaWiki, the free and open-source software platform used by Wikimedia projects. The technical environment evolved from a single-server setup into a distributed architecture, with multiple datacenters, caching systems, monitoring services, and cloud resources designed to support high global traffic and resilience. In 2007 the foundation decided to relocate from Florida to the San Francisco Bay Area, citing access to technology talent, potential partners, and international transport. The move was completed in early 2008. Its offices later moved within San Francisco, including to One Montgomery Tower in 2017. The foundation continued developing a worldwide support structure through grants, regional engagement, legal and public-policy work, affiliate relations, and community events. Wikimedia affiliates began receiving formal recognition in 2004. Over time, the movement established chapters, thematic organizations, and user groups. These bodies remain independent legal entities, although they share the Wikimedia mission and collaborate on conferences, cultural partnerships, editor recruitment, public outreach, and policy advocacy. Wikimania, first held in Frankfurt in 2005, became the principal international gathering for the movement. The foundation’s fundraising model remained centered on small donations from readers and editors, collected through prominent banners and email campaigns. Grants from philanthropic institutions and technology companies supplemented this income. In 2021 the foundation announced Wikimedia Enterprise, a service intended to provide structured, dependable, large-scale access to Wikimedia data for commercial and institutional users. It launched in October 2021, with Google and the Internet Archive announced as early customers or users in 2022. The initiative represented an effort to diversify income and improve data access while keeping the public Wikimedia websites freely available. By the 2020s, the foundation had become a large international nonprofit with hundreds of staff and contractors, substantial digital infrastructure, and a broad mission covering free knowledge, open technology, volunteer communities, legal advocacy, and institutional sustainability. Its central distinction remains that it enables and protects projects whose content is produced by independent volunteer communities rather than by the foundation’s own editorial staff.
- 2023
Wikimania returns in person
[2]Wikimania is held in Singapore with UNESCO participating as a partner organization.
- 2021
Wikimedia Enterprise announced and launched
[1]The foundation introduces a commercial, high-volume content-delivery service for Wikimedia data.
- 2014
Second major datacenter added
[1]A facility in Carrollton, Texas, is added to support redundancy and disaster recovery.
- 2013
Ashburn infrastructure expansion
[1]Wikimedia transitions important infrastructure to an Equinix facility in Ashburn, Virginia, improving connectivity and resilience.
- 2008
San Francisco headquarters move completed
[1]The foundation completes its relocation from Florida to the San Francisco Bay Area.
- 2005
United States public-charity status
[1]The foundation receives 501(c)(3) recognition as a U.S. public charity.
- 2005
First Wikimania
[2]The first annual global Wikimedia conference is held in Frankfurt, Germany.
- 2004
First Wikimedia chapter recognition
[1]The foundation begins formally recognizing independent Wikimedia chapters.
- 2003
Wikimedia Foundation incorporated
[1]The foundation is incorporated in St. Petersburg, Florida, to provide a nonprofit home for Wikipedia and related projects.
- 2001
Wikipedia is founded
[1]Jimmy Wales and Larry Sanger launch Wikipedia as a volunteer-edited project associated with Nupedia.
Products and positioning
A nonprofit, advertising-free infrastructure and support organization for collaboratively produced, freely licensed knowledge.
Online encyclopedia · 2001
Wikipedia
The foundation’s best-known project is a multilingual, volunteer-written encyclopedia available without advertising or a paywall. Editors create and revise articles under community-developed policies and freely licensed terms. The foundation supplies the servers, software, security, fundraising, legal support, and organizational infrastructure, but it does not function as the conventional editorial publisher of article content.
Media repository · 2004
Wikimedia Commons
A freely licensed repository for images, audio, video, and other media. Commons supplies files that can be reused across Wikipedia and sister projects, while also serving as a major public collection of educational and cultural material.
Knowledge base · 2012
Wikidata
A collaboratively maintained, multilingual knowledge base containing structured data that can be read and reused by Wikimedia projects and external applications. It supports linked information, identifiers, and machine-readable relationships across subjects and languages.
Open-source software · 2002
MediaWiki
The free and open-source wiki platform that powers Wikimedia projects. It supports collaborative editing, templates, transclusion, multilingual content, revision histories, and large-scale site operation. The foundation maintains the software and associated technical ecosystem.
Data service · 2021
Wikimedia Enterprise
A commercial service offering high-volume, high-availability access to Wikimedia content through interfaces such as APIs, data snapshots, and streams. It is designed for organizations with substantial data-consumption needs and complements, rather than replaces, public access to Wikimedia sites.
Community conference · 2005
Wikimania
The annual international Wikimedia movement conference for contributors, affiliates, partners, and staff. It combines presentations, workshops, relationship-building, and community discussions about technology, governance, outreach, and free knowledge.
Controversies
2026
Wikimedia Foundation takes systems offline during PHP security response
The Wikimedia Foundation said it was addressing security vulnerabilities in PHP and had taken some systems offline as a precaution until they could be safely patched. The measure left some people unable to access parts of Wikipedia on Wednesday.
Marketing campaigns
- 2020Wikimania online transition
Global · Online
The planned Bangkok Wikimania was canceled because of the COVID-19 pandemic, and subsequent editions were delivered through virtual programming before the event returned to an in-person format.
Outcome. Preserved international community programming during the pandemic period.
- 2003First Wikimedia fundraising drive
Global · Online
An early fundraising campaign helped cover the growing cost of keeping Wikimedia servers operating and established the donation-based model that became central to the foundation’s sustainability.
Outcome. Helped establish recurring public fundraising as a core source of support.
Brand decisions
2021
Create Wikimedia EnterpriseProduct launchBackground
Large technology companies and other institutions increasingly needed dependable, structured, high-volume access to Wikimedia data. The foundation sought to improve that access and diversify its revenue while retaining free public use of Wikimedia websites.
Action taken
The foundation announced Wikimedia Enterprise in March 2021 and launched it in October of the same year as a paid data-delivery service using APIs, snapshots, and streams.
Aftermath
Google became the first announced paying customer, while the Internet Archive received access without paying. The service broadened the foundation’s operating model beyond donations and grants.
Wikimedia Enterprise revenue. $3.1 million (2022)
2007
Move headquarters to the San Francisco Bay AreaStrategyBackground
The foundation evaluated access to technology talent, potential partners, and international travel as it expanded its global technical and organizational responsibilities.
Action taken
It decided to move its headquarters from Florida to the San Francisco Bay Area, completing the relocation in early 2008.
Aftermath
The foundation established its long-term headquarters presence in San Francisco and later moved among several local offices.
Recent events
Wikimedia Foundation takes systems offline during PHP security response[4]
Reported:
The Wikimedia Foundation said it was addressing security vulnerabilities in PHP and had taken some systems offline as a precaution until they could be safely patched. The measure left some people unable to access parts of Wikipedia on Wednesday.
Weekdays and relative dates follow the original report; their exact calendar dates have not been verified.
Sources4 sources
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