Citadel CEO Ken Griffin told an audience at the 2026 Milken Institute Conference on Tuesday that his firm will deepen its commitment to Miami, and pull back from New York, after Mayor Zohran Mamdani singled out Griffin's Manhattan penthouse in a video promoting a new tax on wealthy property owners. The message from one of Wall Street's most powerful figures was blunt: New York City, under its current leadership, no longer welcomes success.
Griffin framed the decision not as a tantrum but as a rational business judgment, one that carries billions of dollars in consequences for a city already struggling with a fiscal crisis its own mayor has called "historic."
The feud traces back to April 15, when Mamdani posted a video outside Griffin's Manhattan penthouse on Tax Day to promote a proposed pied-à-terre tax targeting luxury second homes. Griffin called the stunt "creepy and weird." At the Milken conference, he escalated that assessment, describing the video as a signal to every business leader in the city about what kind of treatment they can expect.
Griffin did not mince words on stage. He told the audience that when Citadel left Chicago, the firm weighed New York against Miami, and Miami won.
"When we moved from Chicago, there was a debate between New York and Miami. It's unquestionably true that we made the right choice. I'll leave it at that."
But he didn't leave it at that. Griffin went on to say that Mamdani's conduct had sent a clear message, not just to him personally, but to every partner and employee Citadel has in New York.
"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 drew a broader contrast between states that reward achievement and cities that punish it. Griffin pointed to what he called a "mass exodus of business leadership from California to Texas and Florida" and placed New York squarely in the column of places pushing wealth away.
"Mamdani's making it very clear. New York doesn't welcome success."
That line landed with particular force given what's at stake. Citadel has said its principals and employees paid nearly $2.3 billion in New York city and state taxes over the past five years. The firm had also been planning a massive redevelopment at 350 Park Avenue, a project its chief operating officer, Gerald Beeson, said would involve more than $6 billion in spending and create thousands of jobs.
That project is now in doubt. Beeson warned in an internal memo that the development may not move forward, writing: "The project, if we move forward, will entail more than $6 billion dollars of spending."
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 governance failures. Fox News reported that Citadel's Chicago office shrank from roughly 1,300 employees to only a few hundred as operations shifted south. Griffin said at the time that "asking people to leave Chicago for New York or Miami has not been hard."
Chicago's loss was Miami's gain. Now New York faces the same arithmetic, and the same political leadership that created the problem shows no sign of course correction.
The backlash against Mamdani's penthouse video was swift and bipartisan in the business community. Beeson called it "shameful" that the mayor used Griffin's name "as the example of those who supposedly aren't carrying their fair share of the burdens associated with New York City's often costly and wasteful spending."
Griffin himself went further at the Milken conference, casting the divide in philosophical terms. He contrasted what he called the American dream of "earned success" against what he described as Mamdani's governing vision.
"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."
A statement from Mamdani's office to Fox News Digital tried to thread a needle. The mayor's team praised Griffin as "a major employer in our City and a powerful figure in our economy" while insisting the tax system needed an overhaul.
"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 statement is revealing for what it doesn't address. It doesn't acknowledge the $2.3 billion Citadel's people have already paid in city and state taxes. It doesn't address the potential loss of a $6 billion development project and the construction jobs that go with it. And it doesn't explain how driving out the city's largest taxpayers will help "working people" who depend on the economic activity those taxpayers generate.
Prominent business figures have already taken apart Mamdani's tax logic, pointing out that policies designed to soak the rich tend to soak the cities that lose them instead.
The contradiction in Mamdani's position got even sharper last week, when the mayor personally thanked Griffin at One Police Plaza, the NYPD's headquarters, for funding a memorial wall honoring fallen officers. Standing in the Hall of Heroes before department brass and families of slain officers, Mamdani said: "I also want to thank Ken Griffin for funding a memorial wall that will open later this year."
So within the span of weeks, the same mayor publicly targeted Griffin's home to promote a tax hike, then stood beside police leadership to thank him for his generosity. That whiplash tells you everything about how this administration operates: take the money, vilify the donor, and hope nobody notices the gap.
The proposed pied-à-terre tax targets non-resident second homes worth more than $5 million, the New York Post reported. Griffin described the video promoting it as "frightening", not because of the policy details alone, but because the city's chief executive chose to personally single out a private citizen's home for a political message.
That distinction matters. Tax policy is fair game for debate. Showing up outside a specific taxpayer's residence to make a populist video is something else entirely. It signals that in Mamdani's New York, success makes you a target, not a taxpayer to be courted, but a prop to be used.
Mamdani's first months in office have already drawn criticism for unfulfilled promises and fiscal mismanagement. The mayor has publicly described the city's budget crisis as historic and turned to Albany for help. Against that backdrop, picking a public fight with one of your city's biggest employers and taxpayers isn't bold governance. It's reckless.
Mamdani has doubled down on the "tax the rich" framing even as the consequences become clearer. Griffin's response has been equally direct: not just words, but the reallocation of capital, jobs, and institutional commitment from New York to Florida.
The numbers tell the story plainly. A firm that paid $2.3 billion in local taxes over five years is now reconsidering a $6 billion development that would have created roughly 6,000 highly paid construction jobs. Those aren't abstract figures. They represent paychecks, tax revenue, and economic activity that New York may simply lose, not because of market forces, but because its mayor chose to make a political spectacle out of a taxpayer's front door.
Griffin's move from Chicago already proved that these warnings are not bluffs. Citadel left. The jobs left. The tax revenue left. Critics across the political spectrum have questioned whether Mamdani's ideological commitments are compatible with running a city that depends on private-sector prosperity.
Griffin framed the broader trend in simple terms: California lost business leadership to Texas and Florida. Chicago lost Citadel to Miami. Now New York is next in line, and its mayor is accelerating the process rather than reversing it.
The pattern is consistent across every blue city that has tried this approach. Raise taxes, demonize wealth creators, treat business as a resource to be extracted rather than a partner to be cultivated, and then act surprised when the money moves to a state with no income tax and a governor who returns phone calls.
Mamdani's office says it wants New York to be "a place that working people can afford." But working people don't benefit when a $6 billion construction project evaporates. They don't benefit when a firm that employs thousands reconsiders its footprint. And they don't benefit when their mayor's idea of fiscal leadership is filming a populist video outside a billionaire's apartment while the city's budget collapses behind him.
Ken Griffin isn't the villain in this story. He's the canary in the coal mine, and he's already packed his bags once before. The only question left is whether New York's leadership will notice the pattern before the next moving truck pulls away.
