Mark O'Hare became a billionaire after BlackRock acquired his data company. Now he's turning his employees into millionaires.

Mark O'Hare became a billionaire after BlackRock acquired his data company. Now he's turning his employees into millionaires.

Leonardo Munoz/VIEWpress

Some Preqin employees are poised for a big payday after BlackRock acquired the data company for $3.2 billion.

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