Take context from the input text and decide on the accurate relationship between 'Glencore' and 'BlackRock' from the options provided.
Options: brand, position held, owned by, developer

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