The Globe and Mail reports in its Wednesday edition that SoftBank Group's $5.8-billion sale of its Nvidia stake shook markets on Tuesday, raising concerns the artificial intelligence frenzy may have peaked, especially after recent warnings from Wall Street executives and a prominent short seller (all figures U.S.). A Reuters dispatch to The Globe reports that SoftBank announced it sold all 32.1 million Nvidia shares in October to support chief executive officer Masayoshi Son's AI efforts, including a $500-billion project to expand U.S. data centre capacity and up to $40-billion pledged to Microsoft-backed OpenAI, although specific financing details were not disclosed. Nvidia's sale fuelled investor doubts about AI valuations surpassing fundamentals, causing its shares to drop over 2 per cent and impacting the S&P 500 index. Recent warnings from Morgan Stanley and Goldman Sachs CEOs about potential equity drawdowns have intensified concerns over an AI bubble. Meanwhile, hedge fund manager Michael Burry, famous for predicting the 2008 housing crisis, has bet against Nvidia and Palantir. Analysts say Mr. Son's sale indicates he sees Nvidia's recent rally cooling after a 1,200-per-cent surge over the past three years.