President-elect Donald Trump rang the opening bell at the New York Stock Exchange on Thursday after promising an economic boom to a cheering crowd of traders and business leaders.

Trump was flanked by Vice President-elect JD Vance, new first lady Melania Trump, NYSE President Lynn Martin and two of his children, Ivanka and Tiffany, as the bell rang.

Audience members from the floor included David Solomon of Goldman Sachs, Jane Fraser of Citigroup, Hans Vestberg of Verizon, Brian Cornell of Target and Bill Ackman of Pershing Square.

At some point the chant of “USA” broke out in the room.

In brief remarks earlier, Trump promised that his new administration would “unlock an economy like never before seen.”

“We are going to provide tremendous stimulus like no other country has done,” Trump told the wealthy crowd, including through “very significant” tax cuts.

He reiterated his promise to cut the corporate tax rate – which had already been cut to 21% in his first term – to 15%, but only for companies that choose to produce in the United States

“You pay 21% if you don’t build here. If you do it, we’ll try to get it to 15%, but you have to build your product, make your product in the United States,” Trump told CNBC’s Jim Cramer after the bell.

Trump also reiterated his plans to boost U.S. oil production, promising it would reduce inflation.

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— CNBC’s Alex Harring contributed to this report.