The meeting was scheduled for hours after Zelenskiy addressed the United Nations Security Council about Russia's invasion and its consequences.
Ukraine has tried to lock in financial support from business leaders to help rebuild the country.
A spokesperson for Zelenskiy and Ukraine's mission to the United Nations in New York did not immediately respond to a request for comment.
Since the start of the war, Ackman's foundation has donated roughly $24 million to support Ukraine, a person familiar with the numbers said.
Before the meeting in New York, the White House appealed to Congress to approve billions of additional dollars of support for Ukraine.
Persons:
Ken Griffin, Mike Blake, Volodymyr Zelenskiy, Zelenskiy, JPMorgan Chase, Bill Ackman, Jonathan Gray, Robert Kraft, Henry Kissinger, Eric Schmidt, Mike Bloomberg, Barry Sternlicht, Mary Callahan Erdoes, Vince LaPadula, Whitney Tilson, Griffin, Howard Buffett, Warren, Svea Herbst, Bayliss, Lananh Nguyen, Andrea Shalal, Michelle Nichols, Megan Davies, Grant McCool
Organizations:
Citadel, Milken, Global Conference, REUTERS, United Nations Security Council, JPMorgan, Blackstone Group, New England Patriots football team, United, State, Google, United Nations, Griffin's Citadel, Ackman's Pershing, Capital Management, Ukraine, Fox News, Svea, Thomson
Locations:
Beverly Hills , California, U.S, New York, Ukraine, United States