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SoftBank Tumbles Again, Erasing $4.9 Billion From Masayoshi Son’s Fortune

Investors point to rising competition to OpenAI from Google’s Gemini 3 as the driver of the latest selloff.

Overview

  • SoftBank shares fell nearly 11% on Tuesday before a slight rebound to ¥15,390, after a 10.9% drop on Friday on the Tokyo Stock Exchange.
  • Forbes estimates Masayoshi Son’s net worth declined by $4.9 billion to $49.3 billion, placing him 32nd globally and eighth in Asia.
  • Market commentary ties the slide to worries that Google’s newly launched Gemini 3 could challenge OpenAI, a key SoftBank exposure.
  • The company disclosed it sold its entire 32.1 million-share Nvidia stake in October for $5.83 billion to help fund major AI bets including OpenAI.
  • Benzinga reports the stock is down roughly 36% over the past month, while a Yale researcher has flagged developing antitrust concerns around the Stargate AI infrastructure initiative.