Their website says:
"The Options Clearing Corporation (OCC), founded in 1973, is the world's largest equity derivatives clearing organization. We are dedicated to promoting stability and financial integrity in the marketplaces that we serve by focusing on sound risk management principles. By acting as guarantor, we ensure that the obligations of the contracts we clear are fulfilled."
Some more useful information from the OCC is
- Daily volume statistics for Options Open Interest
- Daily volume statistics for Futures Open Interest
- Understanding Stock Options (pdf)
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