Shorts Are Circling Some of the AI Boom’s Biggest Question Marks

  • Bearish reports hit Super Micro, Lumen, Symbotic shares
  • ‘We’re separating winners and losers,’ Ken Mahoney says
Hindenburg Research founder Nate Anderson is bearish on some AI darlings.Photographer: Bonnie Jo Mount/The Washington Post/Getty Images
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It’s the story of so many stock market manias: A transformative technology juices a few companies, a bunch of more questionable outfits follow in their wake, and Wall Street buys it all. Then time sorts out what’s real from fake.

Artificial intelligence, which has fueled the latest bounce in the S&P 500 Index as everything remotely attached to the technology sees its stock price soar, is the latest example. And it’s reached the point where some investors are betting against a few of those AI darlings, like Super Micro Computer Inc. and Lumen Technologies Inc., whose shares were up more than 250% at various points this year.