Check out the companies making the biggest moves midday: Alphabet — The YouTube and Google parent climbed 4% to an all-time high after rolling out its Gemini 3 artificial intelligence platform Tuesday. Google said Gemini 3 lets users get better answers to more complex questions and needs less prompting to find the context and intent behind requests. Eversource — The utility dropped more than 8% after the state of Connecticut rejected the company's sale of its Aquarion Water unit. MP Materials — The rare earths mine operator rallied about 10% after it announced a partnership with the U.S. Defense Department and Saudi Arabia's Maaden to develop a rare earth refinery . Goldman Sachs also initiated the stock earlier in the day with a buy rating . Nvidia — Shares rose 2% ahead of the company's

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