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 .
Refer to the input text as context and select the correct relationship between 'Citigroup' and 'BlackRock' from the available options.
Options: parent organization, owned by, headquarters location, developer