July 28 (Reuters) - CME Group Inc reported a 1.4% rise in second-quarter profit on Wednesday, helped by lower expenses and higher trading across asset classes. The exchange operator’s net profit rose to $510.3 million, or $1.42 per share, in the quarter ended June 30, from $503.3 million, or $1.40 per share, a year earlier. (Reporting by Niket Nishant in Bengaluru; Editing by Shounak Dasgupta) Our Standards: The Thomson Reuters Trust Principles.