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After hiding in the shadows for nearly two years, the big-name investment banks are quietly testing the waters for a return to underwriting Chinese IPOs in New York. That’s the big story in an IPO filing by QuantaSing Group Ltd. (QSG.US), an adult education company whose newly filed listing plan is most notable for the big names sponsoring it than anything else.

The offering is being underwritten by U.S. giant Citigroup, as well as leading Chinese investment bank CICC, and CLSA, which is owned by leading Chinese brokerage Citic Securities. The list of sponsors also includes Tiger Brokers, one of China’s leading underwriters with strong ties to smaller retail investors, according to the latest copy of its prospectus filed late last week.