Why Did Vicor Stock Jump Before It Raised Its Outlook?

Vicor (VICR) stock gained 21.2% in the week to Monday, Sep 21, while the S&P 500 rose 1.9%. The spark was a new license for its AI power technology. The company said what that license adds to its sales only after Monday's close, when it raised its revenue outlook. So the shares paid for the deal before Vicor put a number on it.