CBOE：4月份，其旗下四家美国期权交易所的总交易量为3100万份合约。

Core Viewpoint - In April, CBOE's four U.S. options exchanges recorded a total trading volume of 31 million contracts [1] Group 1 - CBOE operates four U.S. options exchanges [1] - The total trading volume of 31 million contracts indicates significant market activity [1]