Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

A Bloomberg report on Wednesday said the investors believed the New York Stock Exchange ICE, +1.15% , Nasdaq Stock Market NDAQ, +3.24% and venues operated by Bats Global Markets Inc. had violated the law by enabling high-frequency firms to exploit ordinary investors trading on the exchanges in return for which the firms directed their “considerable” trading activity to them.

Answer: operator: Stock Market, Stock Exchange