Alphabet Inc. shares are poised to shake up the ranking of the world’s most valuable companies, amid signs the search giant is making headway in efforts to rival Nvidia Corp.’s bestselling AI accelerator. That’s prompting investors to reassess the technology landscape and the potential changes in stock market leadership, as rave reviews for Alphabet’s new Gemini artificial intelligence model and demand for AI chips pushes its shares higher. Most Read from Bloomberg Alphabet is up 35% since mid-October ...