Days after International Securities Exchange (ISE) went to
court in a legal maneuver to offer S&P and Dow Jones index
options, those companies along with Chicago Board Options
Exchange (CBOE) filed a suit against ISE.
The lawsuit, filed by CBOE, Dow Jones and S&P parent
company McGraw Hill on 15 November, sought a court ruling that
would prohibit ISE from listing SPX options or DJX options,
because of CBOE's exclusive license rights to those contracts.
Options Clearing Corporation, which clears all equity options
in the US, has also been challenged to prevent the clearing
house from processing such options trades.
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