Utilize the input text as a context reference, choose the right relationship between Citigroup and BlackRock from the options. Options: 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.

The full line-up consists of Bank of America Merrill Lynch , BNY Mellon , BlackRock , Citadel, Citigroup , Credit Suisse , Deutsche Bank , Goldman Sachs , HSBC, Jefferies , JPMorgan , Maverick Capital, Morgan Stanley , Nomura and Wells Fargo .

Answer: owned_by