The financial technology firm, backed by China's biggest e-commerce company Alibaba Group, plans to list simultaneously on Shanghai's Nasdaq-style STAR Market and in Hong Kong, in what sources have said could be the world's largest IPO and come as soon as October.
The Shanghai Stock Exchange approved the listing plan last week.
The company is seeking to raise about $35 billion in the IPO after assessing early investor interest and based on a higher valuation of about $250 billion or more, two sources with direct knowledge of the matter told Reuters.
Ant declined to comment.
Separately, five Chinese asset managers said in their respective statements they would start raising up to 60 billion yuan ($8.83 billion) combined from Friday for mutual funds that would participate in Ant's IPO as strategic investors.
The fundraising period is two weeks, and each fund, with a lock-in period of 18 months, aims to raise up to 12 billion yuan.
The money managers behind the funds are China Asset Management Co (ChinaAMC), E Fund Management Co, Penghua Fund Management Co, China Universal Asset Management Co and Zhong Ou Asset Management Co.
Ant said in its updated prospectus released late on Tuesday that several existing mutual fund products will also participate in its IPO share placement as strategic investors.
(Reporting by Samuel Shen and Julie Zhu; Editing by Muralikumar Anantharaman)