SoftBank shares fell as much as 13% in Tokyo on Friday, marking the largest intraday drop in more than three months. The decline followed a New York Times report that OpenAI may postpone its initial public offering (IPO) until next year.
The report also notes that SoftBank’s stake in the ChatGPT maker is expected to reach roughly $65 billion by October. Expectations that an OpenAI listing would generate a windfall for investors had helped push SoftBank’s market capitalisation past Toyota’s for the first time.
What the market reaction implies
A single report—effectively a rumor—erased about a tenth of SoftBank’s value. The sell-off was not driven by an earnings miss or weaknesses in SoftBank’s many other holdings; rather, it reflects a shift in how the market values the group. Investors appear to be pricing SoftBank increasingly as a single bet on OpenAI.
That concentration is notable because OpenAI remains a private company, so its true market value is an estimate rather than a transparent public price. As a result, any tremor around OpenAI has an outsized impact on SoftBank: the parent’s market value now moves more with perceptions of OpenAI’s worth than with the fundamentals of SoftBank’s diversified portfolio.
Conclusion
SoftBank has, to some extent, become a leveraged tracking vehicle for a company it neither controls nor can reliably price. This leaves SoftBank’s market capitalisation especially vulnerable to news, rumors, and valuation swings tied to OpenAI.
