Ken Griffin said Mamdani's video, filmed outside his apartment, raised safety concerns.

Ken Griffin, CEO of Citadel, reacts to New York City Mayor Zohran Mamdani's push to tax the rich, including a video filmed outside of Griffin's Manhattan apartment.

Mamdani's office said in response to Griffin, "our tax system is fundamentally broken. It rewards extreme wealth while working people are pushed to the brink."

Ken Griffin said Mamdani's video, filmed outside his apartment, raised safety concerns.