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 .
Analyze the relationship between 'Citigroup' and 'BlackRock' within the context of the input sentence.
Options: developer, headquarters location, owned by, parent organization