Citadel CEO Ken Griffin told attendees at the 2026 Milken Institute Conference on Tuesday that New York City Mayor Zohran Mamdani's decision to single out his Manhattan penthouse in a Tax Day video has convinced him and his partners to deepen their commitment to Miami, and pull back from New York.
Griffin's remarks amount to a public warning from one of the country's most prominent financial figures: New York is losing the competition for capital and talent, and its own mayor is accelerating the departure.
"It's unquestionably true that we made the right choice. I'll leave it at that," Griffin said of Citadel's earlier decision to relocate its global headquarters from Chicago to Miami. But he did not leave it at that. He went further, framing Mamdani's rhetoric as a signal that New York no longer wants the jobs, tax revenue, and philanthropy that come with success.
On April 15, Mamdani posted a video filmed outside Griffin's Manhattan penthouse to promote a proposed pied-à-terre tax targeting non-resident second homes valued above $5 million. The video was part of a broader "tax-the-rich" push, and it named Griffin directly.
Griffin, as Fox Business reported, did not take the stunt lightly. He called it a display of "profound lack of judgment" and said it sent a clear message to his New York-based partners about the city's direction.
At the Milken conference, Griffin sharpened the point:
"Now what the mayor of New York has made clear to my partners, and principally my New York partners, is that we need to double down on our bet in Miami because we want to be in a state that embraces business, embraces education, embraces personal freedom and liberty."
He contrasted that vision with what he sees in New York, a city governed by redistribution rather than opportunity.
"And that embraces people having an opportunity to live the American dream, a dream of earned success, not a dream of distributive handouts that leave people dependent on government for their lives and their livelihoods in a way that takes away their dignity and honor."
Griffin's language grew more pointed when he described the personal dimension of Mamdani's video. The New York Post reported that Griffin called the stunt not merely "creepy weird" but "frightening," and linked his concern to the 2024 killing of UnitedHealthcare CEO Brian Thompson in Midtown Manhattan.
That reference was not casual. When a city's mayor films a populist video outside a named billionaire's home, in a political climate where corporate executives have been targeted with violence, the subtext is impossible to miss. Griffin argued that Mamdani's rhetoric risks agitating extremists.
The Citadel founder told the conference that the company is now scaling back its New York footprint, despite previously planning a major expansion there. Breitbart reported that Griffin has halted New York City expansion outright in response to Mamdani's tax plan and political posture.
Mamdani's early tenure has already drawn scrutiny for a pattern of reversals and unmet commitments, as documented in coverage of his first 100 days in office.
The mayor's framing of Griffin as someone who needs to "contribute" more to the city does not survive contact with the numbers. The Washington Free Beacon reported that Griffin already pays more than $800,000 a year in New York property taxes on his Manhattan residence and is a top New York taxpayer through income apportionment.
His philanthropic record in the city is even larger. Griffin has donated roughly $600 million to New York institutions, including a $400 million joint gift to Memorial Sloan Kettering, $40 million to the Museum of Modern Art, $40 million to the Museum of Natural History, and $15 million to the Robin Hood Foundation.
Even Mamdani himself has acknowledged Griffin's generosity, awkwardly. Just last week, the mayor stood at One Police Plaza before department brass and families of slain officers and personally thanked Griffin for funding a memorial wall set to open later this year.
"I also want to thank Ken Griffin for funding a memorial wall that will open later this year," Mamdani said, after thanking Police Commissioner Jessica Tisch and NYPD leadership.
The contradiction is striking. On Tax Day, Mamdani stood outside Griffin's home and cast him as a symbol of undertaxed wealth. Days later, he stood in the Hall of Heroes and thanked the same man for his generosity to the police department. The mayor's office apparently sees no tension between the two performances.
Mamdani's approval among key constituencies has been sliding, with recent polling showing deep dissatisfaction among Jewish New York voters, a group that has historically anchored the city's political center.
Griffin has done this before. He moved Citadel's global headquarters from Chicago to Miami in 2022 after years of criticizing Illinois over crime, taxes, and deteriorating governance.
"Chicago, over the past six or seven years, has been engulfed in a series of problems," Griffin said at the time, citing crime and broader policy failures. "Asking people to leave Chicago for New York or Miami has not been hard."
The results in Chicago were measurable. Fox News reported that Citadel's Chicago office shrank from about 1,300 employees to only a few hundred after the move south. That is not just a corporate relocation story. It is a jobs story, a tax-base story, and a warning to any city that treats its largest employers as political props.
Griffin drew the parallel himself at the Milken conference: "We've seen a mass exodus of business leadership from California to Texas and Florida. Mamdani's making it very clear. New York doesn't welcome success."
Meanwhile, Mamdani's governing record continues to draw fire on multiple fronts, including his recent request for lawmakers to extend his own budget deadline, a move critics called a sign of managerial dysfunction.
A statement provided to Fox News Digital tried to thread the needle. It insisted Mamdani "wants all New Yorkers to succeed," including "business owners and entrepreneurs who create good-paying jobs and make this city the economic engine of America." It specifically named Griffin as "a major employer in our City and a powerful figure in our economy."
But the statement then pivoted to the familiar progressive refrain:
"That does not negate the fact, however, that our tax system is fundamentally broken. It rewards extreme wealth while working people are pushed to the brink. The status quo is unsustainable and unjust. If we want this city to become a place that working people can afford, we need meaningful tax reform that includes the wealthiest New Yorkers contributing their fair share."
The phrase "contributing their fair share" does a lot of work in that sentence, especially when directed at a man who pays six figures in property taxes, generates enormous income-tax revenue, employs hundreds in the city, and has given $600 million to its cultural and civic institutions.
Mamdani's statement also described the tax system as one that "rewards extreme wealth." That is a political assertion, not a fiscal analysis. New York already imposes some of the highest marginal income tax rates in the country on top earners. Griffin's complaint is not that he should pay nothing. It is that the mayor chose to make him a public target, filming outside his home, naming him by name, while simultaneously accepting his donations.
That kind of political theater has consequences. Even some of Mamdani's own supporters have begun pushing back, as seen in East Village residents who backed him by 40 points now suing to block a homeless shelter in their neighborhood.
Citadel is not a small firm with a symbolic presence. When Griffin says he is halting expansion and redirecting investment to Miami, that means jobs, office leases, tax revenue, and downstream spending that New York will not see. It means the next round of hires goes to Florida. It means the next office buildout happens in a state with no income tax.
Griffin framed the choice in cultural terms as much as fiscal ones. He described Florida as a state that "embraces personal freedom and liberty" and contrasted it with a New York that, in his view, has embraced dependency over opportunity.
Whether one agrees with Griffin's philosophy or not, the economic math is straightforward. When a city's mayor films campaign-style videos outside the homes of its largest taxpayers and donors, those taxpayers and donors start looking at the exits. Chicago learned that lesson. New York appears determined to learn it again.
Mamdani can film all the Tax Day videos he wants. But the tax revenue he is counting on walks out the door on two legs, and Ken Griffin just told the world which direction he is walking.
