Google CEO Sundar Pichai gestures to the crowd during Google's annual I/O developers conference in Mountain View, California on May 20, 2025. Camille Cohen | Afp | Getty ImagesAlphabet has joined the $3 trillion club.Shares of the search giant jumped more than 4% on Monday, pushing the company into territory occupied only by Nvidia, Microsoft and Apple.The stock got a big lift in early September from an antitrust ruling by a judge, whose penalties came in lighter than shareholders feared. The U....