New York City business moguls ripped hedge-fund tycoon Bill Ackman for congratulating Mayor-elect Zohran Mamdani on his Tuesday win — after he famously spent a fortune trying to knock the left-wing lawmaker out of the high-stakes race.

Ackman, the billionaire boss of Pershing Square Capital , wrote late Tuesday to Mamdani on X: “congrats on the win. Now you have a big responsibility. If I can help NYC, just let me know what I can do.”

That was after Ackman had bankrolled major opposition to Mamdani — first backing lame duck Mayor Eric Adams’ failed reelection bid — then throwing his support behind former Gov. Andrew Cuomo, who got hammered on Tuesday.

New York City business power broker Kathryn Wylde called Ackman’s olive branch “ridiculous,” saying he was merely “trying to justify

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