Ken Griffin's Citadel Is Said to Stop Event-Driven Investing

  • Joseph Rotter, head of the strategy, has left the firm.
  • Citadel will still invest in companies going through mergers.

Citadel, the $26 billion investment firm run by Ken Griffin, stopped investing in companies going through events like spinoffs and restructurings, and the head of that business has left, said a person familiar with the firm.

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