Japanese SoftBank said it is considering seeking a valuation of about $90 billion for its domestic wireless business SoftBank Mobile in a planned initial public offering.

SoftBank is speaking to advisers about selling a third or about $30 billion of the business in the initial public offering (IPO).

Discussions are preliminary and the final valuation will depend on investors’ feedback.

 A $30 billion-IPO would make SoftBank Mobile the largest listing ever.