Open Society Foundations

For the type of society, see Open society.

Open Society Foundations
AbbreviationOSF
FoundedApril 1993 (1993-04)
FounderGeorge Soros
Location
Chair
Alexander Soros
President
Binaifer Nowrojee
Revenue$436 million (2023)
Endowment$23 billion (2025)
Websiteopensocietyfoundations.org
Formerly called
Open Society Institute

Open Society Foundations (OSF), formerly the Open Society Institute, is an American grantmaking network founded by billionaire business magnate George Soros. OSF financially supports progressive organizations. As of 2025, OSF has reported expenditures in excess of $24.2 billion since its establishment in 1993. OSF has assets of over $23 billion, making it one of the world's largest foundations. It has offices in over a dozen countries. The New York Times described OSF as "a sprawling political and philanthropic empire that seeks to advance a liberal, democratic agenda around the globe".

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