The Options Clearing Corporation
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A maker of the world's largest equity derivatives clearinghouse, the Options Clearing Corporation stands in the middle of every U.S. exchange-listed options trade, guaranteeing that buyers and sellers fulfill their contracts. Founded in 1973 as the CBOE Clearing Corp., a subsidiary of the Chicago Board Options Exchange, it was later renamed to reflect its broader role as an independent clearinghouse. Fun fact: on its opening day, the new options market traded just 911 call contracts, a humble start for a system that now clears millions of contracts daily.
Private company (not publicly traded)
No Schedule 13D or 13G filings recorded.