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To: Michael Collings who wrote (6218)1/12/1998 8:29:00 PM
From: Oeconomicus  Read Replies (1) | Respond to of 27307
 
MC, look at cboe.com's quote service and note that the OI on every strike/expiry is exactly the same across the exchanges. My guess is that its an OCC (Options Clearing Corp.) number since one can buy a contract on one exchange and sell it on another to close.

Bob