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SoftBank Group shares tumble on OpenAI competition worries

The stock sank as much 11% on Tuesday, following a 10.9% dive in the previous session before Japan’s long weekend

November 25, 2025 / 10:32 IST
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The sharp back-to-back declines stand out even for SoftBank Group, whose shares are highly volatile

SoftBank Group shares tumbled on Tuesday, hitting a 2 1/2-month low on worries that the latest Gemini artificial intelligence model from Alphabet may intensify competition for OpenAI — the Japanese conglomerate’s key investment.

The stock sank as much 11% on Tuesday, following a 10.9% dive in the previous session before Japan’s long weekend. The sharp back-to-back declines stand out even for SoftBank Group, whose shares are highly volatile.

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“The stocks are hit by concerns that the competition environment of Open AI will become tougher after Google’s Gemini 3 received strong reviews,” said Tsutomu Yamada, market analyst at Mitsubishi UFJ eSmart Securities Co.

SoftBank Group, which briefly became Japan’s second company after Toyota Motors to reach a ¥40-trillion ($255 billion) market capitalization less than a month ago, has since lost more than 40% of its value.