July 31 (Reuters) - Pershing Square USA said on

Wednesday it was withdrawing its initial public offering, a day

after hedge fund manager Bill Ackman's new portfolio in the

United States disclosed it would raise roughly $2 billion in

capital.

Ackman said on Wednesday he would revisit the IPO once he is

ready to launch a revised transaction.

"While we have received enormous investor interest in PSUS,

one principal question has remained. Would investors be better

served waiting to invest in the aftermarket than in the IPO?,"

Ackman said in a statement.

The fundraising target for the new fund was a fraction of

the $25 billion the billionaire investor had initially expected

to bring in.