Refer to the input text as context and select the correct relationship between 'Glencore' and 'BlackRock' from the available options.
Options: brand, developer, position held, owned by

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