The partial stock market listing of US private equity giant Blackstone has raised $4.13bn (£2.07bn).
Blackstone boss Steve Schwarzman is set to receive a bumper sum
Floating a 13.2% stake in the company, the shares were priced at $31, at the higher end of forecasts, which values the company at about $33.5bn.
The listing comes despite some US politicians calling for it to be delayed, arguing that Blackstone and similar firms should pay more tax.
China's purchase of a large stake in Blackstone has also caused concern.
The Chinese State Investment Company bought a 10% share in the business for £3bn in May.
Some US politicians had called for Blackstone's float to be delayed until they could introduce a new law to increase the amount of tax that such private equity firms have to pay.
At present a loophole allows such companies to pay significantly less than more typically structured businesses.
China's investment in Blackstone has raised national security concerns in Washington.
Blackstone has an interest in the firm that supplies software to the US military, prompting fears about foreign influence over key national assets.
Reports say that Blackstone's chief executive and co-founder Stephen Schwarzman will walk away from the float with a 24% stake in the business worth about $7.7bn.