About OSI and the Soros Foundations Network The Open Society Institute (OSI) is a private operating and grantmaking foundation based in New York City that serves as the hub of the Soros foundations network, a group of autonomous foundations and organizations in more than 50 countries. more
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OSI-New York, OSI-Budapest, OSF-London, OSI-Paris and OSI-Brussels are separate organizations that operate independently yet cooperate informally with each other. This website, a joint presentation, is intended to promote each organization’s interests.