China’s Chongqing Casin Enterprise Group to buy Chicago Stock Exchange John McCrank February 6, 2016 PremiumChicago Stock Exchange Inc, one of the oldest exchanges in the United States, on Friday announced its planned sale to an investor group led by China’s Chongqing Casin Enterprise Group. Continue reading this story with a subscription to DealStreetAsia. Subscribe Already a subscriber? Log in Should your colleagues be reading this article too? Contact us for corporate subscriptions at email@example.com.