Speaking at the Milken conference in Beverly Hills, Griffin said Tuesday the expansion follows New York Mayor Zohran Mamdani's proposed second-home tax on billionaires.
He said the mayor's stance had convinced his partners, especially those in New York, that they should "double down" on Miami.
The remarks sharpen Griffin's feud with Mamdani and signal further commitment to Miami as Citadel expands beyond New York.
Is Ken Griffin's Miami move the tipping point in a national realignment of America's wealth and corporate power?
With Citadel's massive expansion, can Miami's infrastructure sustain the influx of 'tax refugee' wealth and population?
As billionaires flee to Florida, are high-tax states miscalculating the true cost of their wealth tax proposals?