SoftBank Group stock surged nearly 13% on Tuesday, hitting a record intraday high of 8,000 yen and emerging as the best performer on the Nikkei 225.
The move extended the stock’s winning run to a fourth straight session, turning Masayoshi Son’s technology investment group into one of the clearest market winners from the latest wave of AI enthusiasm.
The rally was not driven by one simple catalyst.
Instead, investors are reevaluating SoftBank around two assets that now sit at the heart of the global AI trade: Arm Holdings and OpenAI.
How one chip designer is driving SoftBank’s revival
The first reason behind the rally is Arm.
SoftBank owns roughly nine-tenths of the British chip designer, whose technology is used to design the architecture that powers smartphones, servers and a growing range of AI-linked computing systems.
That makes ARM one of SoftBank’s most important links to the AI hardware boom.
SMBC Nikko raised its price target for SoftBank to 8,500 yen from 5,200 yen, citing the group’s improved exposure to Arm.
From the 8,000 yen intraday high, that target implies roughly 6.25% further upside.
The timing also matters as Nvidia’s latest quarterly results, released last week, strengthened the market’s belief that AI chip demand has not peaked.
The OpenAI wildcard
SoftBank’s position in the ChatGPT maker is now worth nearly $80 billion, and the company has already made about $45 billion in gains on the investment.
That is the sort of number that changes how investors look at a company.
SoftBank is no longer being valued only as a broad technology conglomerate with a mixed record of startup bets.
It is increasingly being treated as a high-conviction AI vehicle, with Son once again leaning into the kind of bold, concentrated investment style that has defined his career.
There are reasons to be careful as SoftBank’s OpenAI wager has raised questions about financing pressure, while S&P Global Ratings revised its outlook on the company to negative in March, citing competition facing OpenAI and the impact of SoftBank’s large investment on portfolio liquidity.
Still, the market reaction suggests those concerns have not broken the AI thesis.
SoftBank has said its cumulative OpenAI investment could reach $64.6 billion for a 13% stake, and investors appear willing to tolerate the debt risk as long as the value of the OpenAI holding keeps rising.
SoftBank stock: Is this rally built to last?
The key question now is whether SoftBank’s rally is a short-term momentum trade or a deeper re-rating.
A momentum trade is when investors buy mainly because the stock is already rising, while a re-rating is more durable and it means the market has changed how it values the business.
It suggests analysts are not merely reacting to one strong trading day, but assigning more value to SoftBank’s AI exposure through Arm and OpenAI.
The risks are also clear as the stock is trading at record levels, which leaves less room for disappointment.
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