Here you go - the number is not specified though:
https://www.bloomberg.com/news/articles/2017-03-28/blackrock-said-to-cut-jobs-fees-in-revamp-of-active-equity-unit
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Pack your boxes and get ready! But don't worry, your Asian replacements are on their way - "and will put more emphasis on hiring in the emerging markets, especially Asia. "
https://www.bloomberg.com/news/articles/2017-03-28/blackrock-said-to-cut-jobs-fees-in-revamp-of-active-equity-unit