SoftBank Stock Slides Nearly 6% as Portfolio Company's IPO Filing Reveals $3.2 Billion Loss

SoftBank Group Corp. shares tumbled on Wednesday after a U.S. IPO filing from one of its key portfolio companies, SB Energy Corp., revealed staggering losses. The disclosure intensified investor scrutiny of the Japanese conglomerate's high-stakes bets on artificial intelligence amid a broader market downturn.

IPO Filing Reveals Deep Losses

SoftBank's stock closed down 5.9% at ¥4,953 in Tokyo trading. The sell-off was triggered by a prospectus filed by SB Energy, a data center and power infrastructure firm backed by both SoftBank and OpenAI, for its planned Nasdaq initial public offering.

The filing disclosed a net loss of $3.2 billion on revenue of just $139 million for the first half of 2026. This represents a dramatic widening of losses from the $216 million deficit reported for the same period a year prior, raising concerns about the financial health of companies within SoftBank's AI-focused investment strategy.

Balance Sheet and Strategy Under Scrutiny

The SB Energy disclosure compounded existing anxieties surrounding SoftBank's financial position. The parent company is known to be carrying a $40 billion bridge loan connected to its investment strategy involving OpenAI.

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Further stoking concerns, SB Energy's own IPO prospectus identified its dependence on OpenAI as a significant potential risk, according to the filing. This highlights the concentrated nature of the risks embedded in SoftBank's portfolio.

Broader Market Headwinds

The pressure on SoftBank was exacerbated by a weak broader market. Japan's benchmark Nikkei 225 index fell nearly 3% on Wednesday, its third consecutive day of declines, following a sharp sell-off in U.S. markets.

Tech stocks were particularly affected by a surge in Japanese government bond yields, with the 10-year yield hitting a 30-year high on Tuesday. This rising yield environment created additional headwinds for growth-oriented technology investors.