The CBI has booked 51 entities for allegedly remitting Rs 1,038 crore of black money to Hong Kong during 2014-15, officials said on Monday. It is alleged that 51 entities, mostly owned by Chennai residents, remitted Rs 1,038 crore unaccounted black money to Hong Kong in connivance with unidentified officials of three state-owned banks Bank of India, SBI and Punjab National Bank, they said.