Trade Desk Plunges, Sending Warning on Ad Market, Economy

  • Digital ad platform projected weak fourth-quarter revenue
  • Shares of Meta, Snap and Pinterest declined on the outlook
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Trade Desk Inc. shares plummeted the most in a year-and-a-half after the digital advertising platform gave a weak revenue forecast for the current quarter, sending a warning flare about the health of the ad market.

Snap Inc. and Pinterest Inc., social-media companies that rely on advertising sales, also fell on news of Trade Desk’s outlook.