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