Microsoft on Thursday briefly overtook Apple as the world's most valuable company for the first time since 2021 after the iPhone maker's shares made a weak start to the year on growing concerns over demand. Microsoft's shares have risen sharply since last year thanks to the early lead the company has taken in generative artificial intelligence through an investment in ChatGPT-maker OpenAI. They were up 0.7% on Thursday, giving Microsoft a market value of $2.865 trillion. Ticker Security Last Change Change % ...