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'The demographic dividend of the last 40 years is ending': J.P. Morgan says the world is running out of the two things that kept interest rates down

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Jensen Huang made his $172 billion fortune on AI chips. His family's $75 million gift to Vanderbilt argues art decides what technology is for

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SuccessBillionaires

Meet the billionaires spending over six figures to stop Zohran Mamdani from becoming New York’s next mayor, from Michael Bloomberg to Bill Ackman

By
Jessica Coacci
Jessica Coacci
Success Fellow
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By
Jessica Coacci
Jessica Coacci
Success Fellow
Down Arrow Button Icon
October 28, 2025, 2:40 PM ET
a portrait Zohran Mamdani.
A reported 26 billionaires and rich families have spent at least $100,000 to support independent candidate Andrew Cuomo.Michael M. Santiago—Getty Images
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Part of Zohran Mamdani’s campaign centers around the belief that billionaires shouldn’t exist. Now, those ultra-wealthy earners are aiming to stop the mayoral candidate, in part, by boosting the profile of former New York Governor Andrew Cuomo, Mamdani’s opponent for this cycle.

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Part of Mamdani’s bid has been to tax the ultra-rich and wealthy corporations, which include an additional 2% tax on New Yorkers earning more than $1 million a year. Despite these multi-million dollar oppositions, Mamdani is maintaining a lead in the mayoral race. 

Some of the groups opposing Mamdani include “Fix the City” (pro-Cuomo committee) and “Defend NYC” (a group made to oppose Mamdani). Fix the City has raised $7.3 million since the primary, Defend NYC has raised almost $2.5 million, according to Business Insider.

Now, roughly 26 billionaires and rich families from around the U.S. have spent at least six figures to support Cuomo, according to an analysis from Forbes. They estimate the total amount equates to over $22 million to back opposition campaigns, including from billionaires Bill Ackman and former New York City Mayor Michael Bloomberg. 

Below are the billionaires who have donated over $100,000 with their net worths, per Forbes. 

Fortune has reached out to Mamdani’s team for comment. 

Donors opposing Mamdani 

NameAmount DonatedGroup(s) SupportedNet Worth
Michael Bloomberg$8.3 millionFix the City$110 billion
Joseph Gebbia$3 millionFix the City · Defend NYC · Put NYC First$7.9 billion
Lauder family$2.6 millionFix the City · Sensible City$25.9 billion
Bill Ackman$1.75 millionFix the City · Defend NYC$9.2 billion
Tisch family$1.2 millionFix the City$10.1 billion
John Hess & family$1 millionFix the City$2.4 billion
Daniel Loeb$775,000Fix the City · Defend NYC · NYers for a Better Future$3.8 billion
Barry Diller$500,000Fix the City$5.1 billion
Steve Wynn$500,000Fix the City$3.9 billion
Marcella Guarino Hymowitz$400,000Fix the City · Put NYC First$2 billion
David Walentas$350,000Fix the City · Empower NYC$2.3 billion
Reed Hastings$250,000Fix the City$6.5 billion
John Fish$250,000Fix the City$2.3 billion
David Lichtenstein$250,000Fix the City · NYers for a Better Future$2 billion
Alice Walton$200,000Fix the City$115 billion
Deborah Simon$200,000Fix the City$11.6 billion
Jerry Speyer$150,000Fix the City$2.2 billion
Stephanie Coleman$150,000Fix the City$7.1 billion (family)
Durst family$110,000Fix the City$8.1 billion
Fisher family$110,000Fix the City$1.6 billion
Daniel Och$100,000Fix the City · Sensible City$4.2 billion
Ken Langone$100,000Fix the City$9.4 billion
James & Kathryn Murdoch$100,000Fix the City$23.4 billion (family)
Bruce & Suzie Kovner$100,000Fix the City$9 billion
Richard Kurtz$100,000Anyone But Mamdani$1 billion
Elghanayan family$100,000Fix the City$2.2 billion
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About the Author
By Jessica CoacciSuccess Fellow

Jessica Coacci is a reporting fellow at Fortune where she covers success. Prior to joining Fortune, she worked as a producer at CNN and CNBC.

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