Shares of SoftBank Group Corp. dropped sharply on June 26, 2026, falling more than 12 percent in Tokyo trading. The decline marked the steepest single-session loss for the Japanese investment firm since August 2024 and reflected growing investor unease following reports that OpenAI may postpone its long-awaited initial public offering until 2027.
The selloff came as market participants reassessed the timeline for realizing value from one of SoftBank’s most significant holdings.
SoftBank has committed approximately $65 billion to OpenAI through its Vision Fund vehicles, securing roughly a 13 percent ownership stake.
This position has already produced substantial paper gains in prior periods, fueling optimism that helped push SoftBank’s own shares to record highs earlier this year.
A successful OpenAI listing had been widely viewed as a potential catalyst that would establish a clear public-market valuation for one of SoftBank’s largest and most complex private assets.
Because the firm’s overall portfolio includes hundreds of unlisted companies without readily available market prices, such a benchmark could have helped reduce the longstanding “conglomerate discount” that often weighs on the stock.
The prospect of a near-term liquidity event had therefore supported investor sentiment around SoftBank’s aggressive push into artificial intelligence.
Reports indicate that OpenAI’s financial advisers have grown cautious about proceeding with a 2026 listing.
Recent volatility in technology markets, including the post-debut weakness in shares of Elon Musk’s SpaceX after its own large IPO, has raised questions about retail and institutional appetite for another high-profile technology offering.
Broader skepticism about whether AI companies can deliver returns commensurate with their elevated valuations has also contributed to the more measured stance.
OpenAI continues to report strong top-line growth. The company generated roughly $13 billion in revenue in 2025 and has targeted a significant increase this year.
At the same time, it remains unprofitable as it invests heavily in data centers, talent acquisition, and new product initiatives.
Chief Executive Sam Altman has reportedly insisted that any public valuation must reach $1 trillion, a level well above the company’s most recent private-round figure.
SoftBank, led by founder Masayoshi Son, has made AI one of its central strategic pillars.
While the potential delay does not change the long-term outlook for the OpenAI investment, it introduces fresh uncertainty about when clearer pricing signals or monetization opportunities might arrive.
The news also weighed on broader Asian technology indices, with Japan’s Nikkei 225 experiencing notable weakness on the same session.
Market observers note that SoftBank’s portfolio valuation remains inherently challenging without additional public comparables.
A postponement of OpenAI’s debut simply extends the period during which investors must rely on private-round multiples and internal models.
Nevertheless, the firm’s leadership has repeatedly emphasized its commitment to supporting high-growth technology companies through market cycles.For now, attention will remain focused on any further signals from OpenAI regarding its regulatory preparations and strategic priorities. The episode underscores both the opportunities and the near-term volatility that accompany large-scale bets on emerging technologies.