SoftBank Group (9984.T) has traded at a stubborn discount to its net asset value for years. On Tuesday it jumped about 8% to roughly ¥6,300, landing among the Nikkei’s top gainers, as fresh IPO details for its data center arm SB Energy gave investors something concrete to cheer. The question worth asking is not whether the bounce was warranted, but how much of that chronic discount the listing can actually close.
SoftBank Group jumped about 8% on Tuesday and was among the top gainers on the Nikkei 225, recovering from an over 11% slump the session before. Monday’s collapse was triggered by OpenAI CEO Sam Altman saying OpenAI will not pursue an IPO in 2026, which disappointed investors who had anticipated a near-term liquidity event from SoftBank’s OpenAI stake. SB Energy stepped into that void quickly.
A regulatory filing Tuesday confirmed that SB Energy, backed by SoftBank Group, will sell up to $500 million in shares to Japanese investors as part of a public listing in the United States. The company said the offering would commence as soon as practicable after its registration statement is declared effective. The plan taps into Japan’s household financial assets of roughly $15 trillion, borrowing from the playbook used to market SpaceX’s June IPO in Japan.
SoftBank may seek a valuation of $50 billion for SB Energy, Reuters has reported. Reports indicate the company is seeking to raise $5 billion to $7 billion, with a target valuation exceeding $50 billion. At that figure, the listing would rank among the largest in the AI infrastructure cycle.
What SB Energy Actually Is
SB Energy traces its roots to SoftBank’s energy platform and has expanded into power-integrated data center development aimed at AI-driven demand. The firm disclosed an 8.8 gigawatts (GW-IT) portfolio of data center capacity contracted or under construction. Its flagship project is the PORTS-Pike Technology Campus in Ohio, a 10-gigawatt campus being developed with OpenAI as the tenant and Nvidia as the exclusive AI compute infrastructure provider.
The financial profile is sobering. In its registration statement, SB Energy reported a net loss of roughly $3.2 billion on about $139 million of revenue for the first half of 2026. The company has said it had no operating data-center capacity at the time of the filing and that it is substantially dependent on OpenAI. Valuing a $50 billion company on a backlog rather than revenue takes conviction. As IPOX Research Associate Lukas Muehlbauer put it, investors have to be convinced that hundreds of billions of contracted demand can be turned into cash flow over coming years.
The blue-chip backing is real. Nvidia has committed to invest $1.5 billion in a private placement at SB Energy’s IPO price, while OpenAI has been issued warrants that SB Energy said were worth roughly $5.5 billion, according to its investment prospectus. SB Energy has applied to list on the Nasdaq Global Select Market and Nasdaq Texas under the ticker symbol SBE.
The Holdco Discount: Bull and Bear
For SoftBank Group shareholders, the real argument is about NAV compression. SoftBank itself has said it continues to experience a “NAV discount,” and market estimates often put the gap around 40%. A public market price on SB Energy makes that asset harder to ignore. When a subsidiary lists, it becomes a marked-to-market line item, and analysts can no longer dismiss it as a private guess.
The bull case: a successful SB Energy listing at or near $50 billion creates a transparent, tradeable reference price for one of SoftBank’s most capital-intensive bets. That reduces the ambiguity that justifies holding company discounts. Arm’s market value has climbed since SoftBank’s prior disclosures, and analysts have argued that further portfolio liquidity events, including IPOs, can help narrow the holdco discount.
The bear case is harder to dismiss. Broader calls for a slowdown in AI development have hit AI-linked stocks in recent sessions, amid growing concerns over AI safety. Other risks include technological advances that could make facilities obsolete, weaker-than-expected AI adoption, regulatory changes, and a slowdown in capital spending by major technology companies. And history matters: SoftBank has listed subsidiaries before without permanently closing its discount.
What to Watch
Three things will determine whether today’s move has legs. First, IPO pricing: if SB Energy lists below $50 billion, the NAV math compresses against SoftBank. Second, OpenAI’s trajectory: a successful SB Energy IPO could provide SoftBank with an important financial catalyst, given that OpenAI has indicated it does not plan to pursue an IPO in 2026. Third, demand from Japanese retail: the appetite for a $500 million Japan tranche is unproven at this scale.
The 8% move was a relief rally, not a rerating. SoftBank’s discount has survived Arm’s listing, Vision Fund markups, and multiple Son-era promises. SB Energy’s IPO is a direct path to making one big asset easier to value, but the company still needs operating data centers and meaningful revenue before the market will treat that discount as fully resolved.
