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.

Each of Rentrak and comScore and their respective executive officers and directors may be deemed to be participants in the solicitation of proxies from their respective shareholders or stockholders with respect to the transactions contemplated by the merger agreement.

Answer: owner_of: comScore, Rentrak