How do you participate in 3rd market option trades?

Quote from wilburbear:

U.S. stock options occasionally put up massive prints on CIN (Cincinnati?). How does a trader participate in these prints?

First of all, I believe CIN merged with the Chicago Stock Exchange. And second, options as far as I know of are not traded on the CSE. Who is your data provider that is showing you these prints?
 
Quote from wilburbear:

U.S. stock options occasionally put up massive prints on CIN (Cincinnati?). How does a trader participate in these prints?

U.S. listed stock options can only trade on one of the exchanges (AMEX, CBOE, Philly, P-Coast, BOX, or ISE).
 
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