The ticker and trading information for Blackstone Group at the New York Stock Exchange in April 2016.: At a time when deals between American and Chinese companies are on the rocks, an early example that united a major Wall Street deal maker with the Chinese government has come to an end. China Investment Corporation, China’s sovereign wealth fund, has sold its stake in Blackstone Group, the American private equity giant, the latter said in a recent filing. The fund, known as C.I.C., did not disclose a reason for the sale, and neither side disclosed how big it was.