(Bloomberg) -- BlackRock, after years of sluggish gains by its traditional stock pickers, is upping its bets on quants.

The world's largest money manager is firing more than 30 people in its active-equities group, including five of its 53 fundamental portfolio managers, according to a person familiar with the matter. The revamp moves $6 billion of the $201 billion run by traditional stock pickers into cheaper funds where quants play a role, the person said.

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