SoftBank Group Corp.’s expected spin-off of its Japanese telecoms business will lure investors seeking exposure to a solid tech name but the prospect of tougher competition in a mature industry may turn off those chasing higher returns.

SoftBank shares have risen about three per cent this week since it said it was considering what would be the largest IPO by a Japanese company in nearly two decades, a deal that would accelerate the group’s transformation into one of the world’s biggest tech investors.

The company aims to sell about 30 per cent of SoftBank Corp., Japan’s number three wireless carrier, for about two trillion yen (£12.93 billion), the Nikkei newspaper reported. The proceeds would be invested in growth assets such as foreign information technology companies.

While it could provide founder Masayoshi Son’s global investment juggernaut with a cash boost, the domestic phone business is facing a concerted attempt by regulators to drive down telco fees and promote new entrants, threatening to crimp profits.

SoftBank no longer attracts the sympathy of regulators as the young upstart that broke up the telecoms duopoly of NTT DoCoMo Inc. and KDDI Corp., with lower prices and an initial, exclusive deal to carry Apple Inc.’s iPhone.

“The big three wireless firms are earning too much. We want to create a fourth pole,” a senior Japanese telecommunications ministry official said on condition of anonymity last month.

Japanese regulators are backing new telecoms entrants such as Rakuten Inc., an e-commerce, streaming and fintech firm that now aims to become the country’s fourth major wireless carrier.

Other government measures to promote competition include the removal of the sim lock from handsets, forcing carriers to alert users when contracts are up for renegotiation and cracking down on cut-price handset deals that smaller players cannot compete with.

“We want to create an environment [for Rakuten] that is as good as, or better than, in eMobile’s time,” the official said, a reference to a successful 2007 attempt by upstart eMobile to enter the wireless market offering ‘pocket WiFi’ devices. eMobile gained four million subscribers before SoftBank bought it in 2013.

SoftBank could be “hedging the risk of more competition” by considering an initial public offering, CLSA analyst Oliver Matthew said in note to clients.

Many analysts have questioned Rakuten’s proposals. Jefferies analyst Atul Goyal said the online retailer’s current spending plans did not appear to pose an immediate threat to incumbents and noted the high costs of building new telecoms networks. The entry of an aggressive new player could even tip the whole Japanese telecoms market away from growth, Sanford C. Bernstein analyst Chris Lane said in a note to clients.

SoftBank has long relied on its domestic telecoms business, which makes up a third of overall sales but two-thirds of profits, as a stable source of cash that can be diverted to its growing number of investments around the world.

A listing would mean a significant cash injection for group CEO Masayoshi Son’s vision of a future driven by artificial intelligence, robotics and interconnected devices.

It would also ease the group’s financial burden following its investments in tech firms such as Uber and the collapse of talks to merge US wireless unit Sprint Corp. with T-Mobile US Inc.

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