What is the relationship between Glencore and BlackRock in the context of the input sentence. Choose an answer from: 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.

Answer: owned_by