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.

BlackRock is the largest shareholder in BHP Billiton, Barrick Gold, Newmont Mining, Freeport and McMoran and South32, and is among the top four shareholders in each of Rio Tinto, Peabody Energy, Fortescue Metals Group, Glencore and Anglo American.
owned_by: Glencore, BlackRock